forked from Minki/linux
4486 lines
104 KiB
C
4486 lines
104 KiB
C
/*
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* Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <jroedel@suse.de>
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* Leo Duran <leo.duran@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/ratelimit.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/amba/bus.h>
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#include <linux/platform_device.h>
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#include <linux/pci-ats.h>
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#include <linux/bitmap.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-direct.h>
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#include <linux/iommu-helper.h>
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#include <linux/iommu.h>
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#include <linux/delay.h>
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#include <linux/amd-iommu.h>
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#include <linux/notifier.h>
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#include <linux/export.h>
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#include <linux/irq.h>
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#include <linux/msi.h>
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#include <linux/dma-contiguous.h>
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#include <linux/irqdomain.h>
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#include <linux/percpu.h>
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#include <linux/iova.h>
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#include <asm/irq_remapping.h>
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#include <asm/io_apic.h>
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#include <asm/apic.h>
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#include <asm/hw_irq.h>
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#include <asm/msidef.h>
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#include <asm/proto.h>
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#include <asm/iommu.h>
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#include <asm/gart.h>
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#include <asm/dma.h>
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#include "amd_iommu_proto.h"
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#include "amd_iommu_types.h"
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#include "irq_remapping.h"
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#define AMD_IOMMU_MAPPING_ERROR 0
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#define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
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#define LOOP_TIMEOUT 100000
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/* IO virtual address start page frame number */
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#define IOVA_START_PFN (1)
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#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
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/* Reserved IOVA ranges */
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#define MSI_RANGE_START (0xfee00000)
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#define MSI_RANGE_END (0xfeefffff)
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#define HT_RANGE_START (0xfd00000000ULL)
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#define HT_RANGE_END (0xffffffffffULL)
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/*
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* This bitmap is used to advertise the page sizes our hardware support
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* to the IOMMU core, which will then use this information to split
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* physically contiguous memory regions it is mapping into page sizes
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* that we support.
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*
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* 512GB Pages are not supported due to a hardware bug
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*/
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#define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))
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static DEFINE_SPINLOCK(amd_iommu_devtable_lock);
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static DEFINE_SPINLOCK(pd_bitmap_lock);
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/* List of all available dev_data structures */
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static LLIST_HEAD(dev_data_list);
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LIST_HEAD(ioapic_map);
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LIST_HEAD(hpet_map);
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LIST_HEAD(acpihid_map);
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/*
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* Domain for untranslated devices - only allocated
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* if iommu=pt passed on kernel cmd line.
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*/
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const struct iommu_ops amd_iommu_ops;
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static ATOMIC_NOTIFIER_HEAD(ppr_notifier);
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int amd_iommu_max_glx_val = -1;
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static const struct dma_map_ops amd_iommu_dma_ops;
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/*
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* general struct to manage commands send to an IOMMU
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*/
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struct iommu_cmd {
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u32 data[4];
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};
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struct kmem_cache *amd_iommu_irq_cache;
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static void update_domain(struct protection_domain *domain);
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static int protection_domain_init(struct protection_domain *domain);
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static void detach_device(struct device *dev);
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static void iova_domain_flush_tlb(struct iova_domain *iovad);
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/*
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* Data container for a dma_ops specific protection domain
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*/
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struct dma_ops_domain {
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/* generic protection domain information */
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struct protection_domain domain;
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/* IOVA RB-Tree */
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struct iova_domain iovad;
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};
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static struct iova_domain reserved_iova_ranges;
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static struct lock_class_key reserved_rbtree_key;
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/****************************************************************************
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*
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* Helper functions
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*
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****************************************************************************/
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static inline int match_hid_uid(struct device *dev,
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struct acpihid_map_entry *entry)
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{
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const char *hid, *uid;
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hid = acpi_device_hid(ACPI_COMPANION(dev));
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uid = acpi_device_uid(ACPI_COMPANION(dev));
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if (!hid || !(*hid))
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return -ENODEV;
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if (!uid || !(*uid))
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return strcmp(hid, entry->hid);
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if (!(*entry->uid))
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return strcmp(hid, entry->hid);
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return (strcmp(hid, entry->hid) || strcmp(uid, entry->uid));
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}
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static inline u16 get_pci_device_id(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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return PCI_DEVID(pdev->bus->number, pdev->devfn);
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}
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static inline int get_acpihid_device_id(struct device *dev,
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struct acpihid_map_entry **entry)
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{
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struct acpihid_map_entry *p;
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list_for_each_entry(p, &acpihid_map, list) {
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if (!match_hid_uid(dev, p)) {
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if (entry)
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*entry = p;
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return p->devid;
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}
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}
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return -EINVAL;
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}
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static inline int get_device_id(struct device *dev)
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{
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int devid;
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if (dev_is_pci(dev))
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devid = get_pci_device_id(dev);
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else
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devid = get_acpihid_device_id(dev, NULL);
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return devid;
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}
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static struct protection_domain *to_pdomain(struct iommu_domain *dom)
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{
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return container_of(dom, struct protection_domain, domain);
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}
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static struct dma_ops_domain* to_dma_ops_domain(struct protection_domain *domain)
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{
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BUG_ON(domain->flags != PD_DMA_OPS_MASK);
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return container_of(domain, struct dma_ops_domain, domain);
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}
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static struct iommu_dev_data *alloc_dev_data(u16 devid)
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{
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struct iommu_dev_data *dev_data;
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dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
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if (!dev_data)
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return NULL;
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dev_data->devid = devid;
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ratelimit_default_init(&dev_data->rs);
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llist_add(&dev_data->dev_data_list, &dev_data_list);
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return dev_data;
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}
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static struct iommu_dev_data *search_dev_data(u16 devid)
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{
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struct iommu_dev_data *dev_data;
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struct llist_node *node;
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if (llist_empty(&dev_data_list))
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return NULL;
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node = dev_data_list.first;
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llist_for_each_entry(dev_data, node, dev_data_list) {
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if (dev_data->devid == devid)
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return dev_data;
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}
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return NULL;
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}
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static int __last_alias(struct pci_dev *pdev, u16 alias, void *data)
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{
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*(u16 *)data = alias;
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return 0;
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}
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static u16 get_alias(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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u16 devid, ivrs_alias, pci_alias;
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/* The callers make sure that get_device_id() does not fail here */
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devid = get_device_id(dev);
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/* For ACPI HID devices, we simply return the devid as such */
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if (!dev_is_pci(dev))
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return devid;
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ivrs_alias = amd_iommu_alias_table[devid];
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pci_for_each_dma_alias(pdev, __last_alias, &pci_alias);
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if (ivrs_alias == pci_alias)
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return ivrs_alias;
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/*
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* DMA alias showdown
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*
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* The IVRS is fairly reliable in telling us about aliases, but it
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* can't know about every screwy device. If we don't have an IVRS
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* reported alias, use the PCI reported alias. In that case we may
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* still need to initialize the rlookup and dev_table entries if the
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* alias is to a non-existent device.
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*/
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if (ivrs_alias == devid) {
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if (!amd_iommu_rlookup_table[pci_alias]) {
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amd_iommu_rlookup_table[pci_alias] =
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amd_iommu_rlookup_table[devid];
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memcpy(amd_iommu_dev_table[pci_alias].data,
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amd_iommu_dev_table[devid].data,
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sizeof(amd_iommu_dev_table[pci_alias].data));
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}
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return pci_alias;
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}
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pr_info("AMD-Vi: Using IVRS reported alias %02x:%02x.%d "
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"for device %s[%04x:%04x], kernel reported alias "
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"%02x:%02x.%d\n", PCI_BUS_NUM(ivrs_alias), PCI_SLOT(ivrs_alias),
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PCI_FUNC(ivrs_alias), dev_name(dev), pdev->vendor, pdev->device,
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PCI_BUS_NUM(pci_alias), PCI_SLOT(pci_alias),
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PCI_FUNC(pci_alias));
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/*
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* If we don't have a PCI DMA alias and the IVRS alias is on the same
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* bus, then the IVRS table may know about a quirk that we don't.
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*/
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if (pci_alias == devid &&
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PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) {
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pci_add_dma_alias(pdev, ivrs_alias & 0xff);
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pr_info("AMD-Vi: Added PCI DMA alias %02x.%d for %s\n",
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PCI_SLOT(ivrs_alias), PCI_FUNC(ivrs_alias),
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dev_name(dev));
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}
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return ivrs_alias;
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}
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static struct iommu_dev_data *find_dev_data(u16 devid)
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{
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struct iommu_dev_data *dev_data;
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struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
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dev_data = search_dev_data(devid);
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if (dev_data == NULL) {
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dev_data = alloc_dev_data(devid);
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if (!dev_data)
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return NULL;
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if (translation_pre_enabled(iommu))
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dev_data->defer_attach = true;
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}
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return dev_data;
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}
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struct iommu_dev_data *get_dev_data(struct device *dev)
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{
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return dev->archdata.iommu;
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}
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EXPORT_SYMBOL(get_dev_data);
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/*
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* Find or create an IOMMU group for a acpihid device.
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*/
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static struct iommu_group *acpihid_device_group(struct device *dev)
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{
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struct acpihid_map_entry *p, *entry = NULL;
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int devid;
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devid = get_acpihid_device_id(dev, &entry);
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if (devid < 0)
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return ERR_PTR(devid);
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list_for_each_entry(p, &acpihid_map, list) {
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if ((devid == p->devid) && p->group)
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entry->group = p->group;
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}
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if (!entry->group)
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entry->group = generic_device_group(dev);
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else
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iommu_group_ref_get(entry->group);
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return entry->group;
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}
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static bool pci_iommuv2_capable(struct pci_dev *pdev)
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{
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static const int caps[] = {
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PCI_EXT_CAP_ID_ATS,
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PCI_EXT_CAP_ID_PRI,
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PCI_EXT_CAP_ID_PASID,
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};
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int i, pos;
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if (pci_ats_disabled())
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return false;
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for (i = 0; i < 3; ++i) {
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pos = pci_find_ext_capability(pdev, caps[i]);
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if (pos == 0)
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return false;
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}
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return true;
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}
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static bool pdev_pri_erratum(struct pci_dev *pdev, u32 erratum)
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{
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struct iommu_dev_data *dev_data;
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dev_data = get_dev_data(&pdev->dev);
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return dev_data->errata & (1 << erratum) ? true : false;
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}
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/*
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* This function checks if the driver got a valid device from the caller to
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* avoid dereferencing invalid pointers.
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*/
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static bool check_device(struct device *dev)
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{
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int devid;
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if (!dev || !dev->dma_mask)
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return false;
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devid = get_device_id(dev);
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if (devid < 0)
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return false;
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/* Out of our scope? */
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if (devid > amd_iommu_last_bdf)
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return false;
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if (amd_iommu_rlookup_table[devid] == NULL)
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return false;
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return true;
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}
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static void init_iommu_group(struct device *dev)
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{
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struct iommu_group *group;
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group = iommu_group_get_for_dev(dev);
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if (IS_ERR(group))
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return;
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iommu_group_put(group);
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}
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static int iommu_init_device(struct device *dev)
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{
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struct iommu_dev_data *dev_data;
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struct amd_iommu *iommu;
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int devid;
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if (dev->archdata.iommu)
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return 0;
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devid = get_device_id(dev);
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if (devid < 0)
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return devid;
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iommu = amd_iommu_rlookup_table[devid];
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dev_data = find_dev_data(devid);
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if (!dev_data)
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return -ENOMEM;
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dev_data->alias = get_alias(dev);
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if (dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) {
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struct amd_iommu *iommu;
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iommu = amd_iommu_rlookup_table[dev_data->devid];
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dev_data->iommu_v2 = iommu->is_iommu_v2;
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}
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dev->archdata.iommu = dev_data;
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iommu_device_link(&iommu->iommu, dev);
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return 0;
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}
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static void iommu_ignore_device(struct device *dev)
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{
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u16 alias;
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int devid;
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devid = get_device_id(dev);
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if (devid < 0)
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return;
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alias = get_alias(dev);
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memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry));
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memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry));
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amd_iommu_rlookup_table[devid] = NULL;
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amd_iommu_rlookup_table[alias] = NULL;
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}
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static void iommu_uninit_device(struct device *dev)
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{
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struct iommu_dev_data *dev_data;
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struct amd_iommu *iommu;
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int devid;
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devid = get_device_id(dev);
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if (devid < 0)
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return;
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iommu = amd_iommu_rlookup_table[devid];
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dev_data = search_dev_data(devid);
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if (!dev_data)
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return;
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if (dev_data->domain)
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detach_device(dev);
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iommu_device_unlink(&iommu->iommu, dev);
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iommu_group_remove_device(dev);
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/* Remove dma-ops */
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dev->dma_ops = NULL;
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/*
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* We keep dev_data around for unplugged devices and reuse it when the
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* device is re-plugged - not doing so would introduce a ton of races.
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*/
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}
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|
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/****************************************************************************
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*
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* Interrupt handling functions
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*
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****************************************************************************/
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static void dump_dte_entry(u16 devid)
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{
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int i;
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for (i = 0; i < 4; ++i)
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pr_err("AMD-Vi: DTE[%d]: %016llx\n", i,
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amd_iommu_dev_table[devid].data[i]);
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}
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static void dump_command(unsigned long phys_addr)
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{
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struct iommu_cmd *cmd = iommu_phys_to_virt(phys_addr);
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int i;
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for (i = 0; i < 4; ++i)
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pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
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}
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|
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static void amd_iommu_report_page_fault(u16 devid, u16 domain_id,
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u64 address, int flags)
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{
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struct iommu_dev_data *dev_data = NULL;
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struct pci_dev *pdev;
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pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid),
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devid & 0xff);
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if (pdev)
|
|
dev_data = get_dev_data(&pdev->dev);
|
|
|
|
if (dev_data && __ratelimit(&dev_data->rs)) {
|
|
dev_err(&pdev->dev, "AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%016llx flags=0x%04x]\n",
|
|
domain_id, address, flags);
|
|
} else if (printk_ratelimit()) {
|
|
pr_err("AMD-Vi: Event logged [IO_PAGE_FAULT device=%02x:%02x.%x domain=0x%04x address=0x%016llx flags=0x%04x]\n",
|
|
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
|
|
domain_id, address, flags);
|
|
}
|
|
|
|
if (pdev)
|
|
pci_dev_put(pdev);
|
|
}
|
|
|
|
static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
|
|
{
|
|
struct device *dev = iommu->iommu.dev;
|
|
int type, devid, pasid, flags, tag;
|
|
volatile u32 *event = __evt;
|
|
int count = 0;
|
|
u64 address;
|
|
|
|
retry:
|
|
type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
|
|
devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
|
|
pasid = PPR_PASID(*(u64 *)&event[0]);
|
|
flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
|
|
address = (u64)(((u64)event[3]) << 32) | event[2];
|
|
|
|
if (type == 0) {
|
|
/* Did we hit the erratum? */
|
|
if (++count == LOOP_TIMEOUT) {
|
|
pr_err("AMD-Vi: No event written to event log\n");
|
|
return;
|
|
}
|
|
udelay(1);
|
|
goto retry;
|
|
}
|
|
|
|
if (type == EVENT_TYPE_IO_FAULT) {
|
|
amd_iommu_report_page_fault(devid, pasid, address, flags);
|
|
return;
|
|
} else {
|
|
dev_err(dev, "AMD-Vi: Event logged [");
|
|
}
|
|
|
|
switch (type) {
|
|
case EVENT_TYPE_ILL_DEV:
|
|
dev_err(dev, "ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x pasid=0x%05x address=0x%016llx flags=0x%04x]\n",
|
|
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
|
|
pasid, address, flags);
|
|
dump_dte_entry(devid);
|
|
break;
|
|
case EVENT_TYPE_DEV_TAB_ERR:
|
|
dev_err(dev, "DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
|
|
"address=0x%016llx flags=0x%04x]\n",
|
|
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
|
|
address, flags);
|
|
break;
|
|
case EVENT_TYPE_PAGE_TAB_ERR:
|
|
dev_err(dev, "PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x domain=0x%04x address=0x%016llx flags=0x%04x]\n",
|
|
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
|
|
pasid, address, flags);
|
|
break;
|
|
case EVENT_TYPE_ILL_CMD:
|
|
dev_err(dev, "ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
|
|
dump_command(address);
|
|
break;
|
|
case EVENT_TYPE_CMD_HARD_ERR:
|
|
dev_err(dev, "COMMAND_HARDWARE_ERROR address=0x%016llx flags=0x%04x]\n",
|
|
address, flags);
|
|
break;
|
|
case EVENT_TYPE_IOTLB_INV_TO:
|
|
dev_err(dev, "IOTLB_INV_TIMEOUT device=%02x:%02x.%x address=0x%016llx]\n",
|
|
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
|
|
address);
|
|
break;
|
|
case EVENT_TYPE_INV_DEV_REQ:
|
|
dev_err(dev, "INVALID_DEVICE_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%016llx flags=0x%04x]\n",
|
|
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
|
|
pasid, address, flags);
|
|
break;
|
|
case EVENT_TYPE_INV_PPR_REQ:
|
|
pasid = ((event[0] >> 16) & 0xFFFF)
|
|
| ((event[1] << 6) & 0xF0000);
|
|
tag = event[1] & 0x03FF;
|
|
dev_err(dev, "INVALID_PPR_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%016llx flags=0x%04x]\n",
|
|
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
|
|
pasid, address, flags);
|
|
break;
|
|
default:
|
|
dev_err(dev, "UNKNOWN event[0]=0x%08x event[1]=0x%08x event[2]=0x%08x event[3]=0x%08x\n",
|
|
event[0], event[1], event[2], event[3]);
|
|
}
|
|
|
|
memset(__evt, 0, 4 * sizeof(u32));
|
|
}
|
|
|
|
static void iommu_poll_events(struct amd_iommu *iommu)
|
|
{
|
|
u32 head, tail;
|
|
|
|
head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
|
|
tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
|
|
|
|
while (head != tail) {
|
|
iommu_print_event(iommu, iommu->evt_buf + head);
|
|
head = (head + EVENT_ENTRY_SIZE) % EVT_BUFFER_SIZE;
|
|
}
|
|
|
|
writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
|
|
}
|
|
|
|
static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw)
|
|
{
|
|
struct amd_iommu_fault fault;
|
|
|
|
if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
|
|
pr_err_ratelimited("AMD-Vi: Unknown PPR request received\n");
|
|
return;
|
|
}
|
|
|
|
fault.address = raw[1];
|
|
fault.pasid = PPR_PASID(raw[0]);
|
|
fault.device_id = PPR_DEVID(raw[0]);
|
|
fault.tag = PPR_TAG(raw[0]);
|
|
fault.flags = PPR_FLAGS(raw[0]);
|
|
|
|
atomic_notifier_call_chain(&ppr_notifier, 0, &fault);
|
|
}
|
|
|
|
static void iommu_poll_ppr_log(struct amd_iommu *iommu)
|
|
{
|
|
u32 head, tail;
|
|
|
|
if (iommu->ppr_log == NULL)
|
|
return;
|
|
|
|
head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
|
|
tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
|
|
|
|
while (head != tail) {
|
|
volatile u64 *raw;
|
|
u64 entry[2];
|
|
int i;
|
|
|
|
raw = (u64 *)(iommu->ppr_log + head);
|
|
|
|
/*
|
|
* Hardware bug: Interrupt may arrive before the entry is
|
|
* written to memory. If this happens we need to wait for the
|
|
* entry to arrive.
|
|
*/
|
|
for (i = 0; i < LOOP_TIMEOUT; ++i) {
|
|
if (PPR_REQ_TYPE(raw[0]) != 0)
|
|
break;
|
|
udelay(1);
|
|
}
|
|
|
|
/* Avoid memcpy function-call overhead */
|
|
entry[0] = raw[0];
|
|
entry[1] = raw[1];
|
|
|
|
/*
|
|
* To detect the hardware bug we need to clear the entry
|
|
* back to zero.
|
|
*/
|
|
raw[0] = raw[1] = 0UL;
|
|
|
|
/* Update head pointer of hardware ring-buffer */
|
|
head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE;
|
|
writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
|
|
|
|
/* Handle PPR entry */
|
|
iommu_handle_ppr_entry(iommu, entry);
|
|
|
|
/* Refresh ring-buffer information */
|
|
head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
|
|
tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_IRQ_REMAP
|
|
static int (*iommu_ga_log_notifier)(u32);
|
|
|
|
int amd_iommu_register_ga_log_notifier(int (*notifier)(u32))
|
|
{
|
|
iommu_ga_log_notifier = notifier;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier);
|
|
|
|
static void iommu_poll_ga_log(struct amd_iommu *iommu)
|
|
{
|
|
u32 head, tail, cnt = 0;
|
|
|
|
if (iommu->ga_log == NULL)
|
|
return;
|
|
|
|
head = readl(iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
|
|
tail = readl(iommu->mmio_base + MMIO_GA_TAIL_OFFSET);
|
|
|
|
while (head != tail) {
|
|
volatile u64 *raw;
|
|
u64 log_entry;
|
|
|
|
raw = (u64 *)(iommu->ga_log + head);
|
|
cnt++;
|
|
|
|
/* Avoid memcpy function-call overhead */
|
|
log_entry = *raw;
|
|
|
|
/* Update head pointer of hardware ring-buffer */
|
|
head = (head + GA_ENTRY_SIZE) % GA_LOG_SIZE;
|
|
writel(head, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
|
|
|
|
/* Handle GA entry */
|
|
switch (GA_REQ_TYPE(log_entry)) {
|
|
case GA_GUEST_NR:
|
|
if (!iommu_ga_log_notifier)
|
|
break;
|
|
|
|
pr_debug("AMD-Vi: %s: devid=%#x, ga_tag=%#x\n",
|
|
__func__, GA_DEVID(log_entry),
|
|
GA_TAG(log_entry));
|
|
|
|
if (iommu_ga_log_notifier(GA_TAG(log_entry)) != 0)
|
|
pr_err("AMD-Vi: GA log notifier failed.\n");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif /* CONFIG_IRQ_REMAP */
|
|
|
|
#define AMD_IOMMU_INT_MASK \
|
|
(MMIO_STATUS_EVT_INT_MASK | \
|
|
MMIO_STATUS_PPR_INT_MASK | \
|
|
MMIO_STATUS_GALOG_INT_MASK)
|
|
|
|
irqreturn_t amd_iommu_int_thread(int irq, void *data)
|
|
{
|
|
struct amd_iommu *iommu = (struct amd_iommu *) data;
|
|
u32 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
|
|
|
|
while (status & AMD_IOMMU_INT_MASK) {
|
|
/* Enable EVT and PPR and GA interrupts again */
|
|
writel(AMD_IOMMU_INT_MASK,
|
|
iommu->mmio_base + MMIO_STATUS_OFFSET);
|
|
|
|
if (status & MMIO_STATUS_EVT_INT_MASK) {
|
|
pr_devel("AMD-Vi: Processing IOMMU Event Log\n");
|
|
iommu_poll_events(iommu);
|
|
}
|
|
|
|
if (status & MMIO_STATUS_PPR_INT_MASK) {
|
|
pr_devel("AMD-Vi: Processing IOMMU PPR Log\n");
|
|
iommu_poll_ppr_log(iommu);
|
|
}
|
|
|
|
#ifdef CONFIG_IRQ_REMAP
|
|
if (status & MMIO_STATUS_GALOG_INT_MASK) {
|
|
pr_devel("AMD-Vi: Processing IOMMU GA Log\n");
|
|
iommu_poll_ga_log(iommu);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Hardware bug: ERBT1312
|
|
* When re-enabling interrupt (by writing 1
|
|
* to clear the bit), the hardware might also try to set
|
|
* the interrupt bit in the event status register.
|
|
* In this scenario, the bit will be set, and disable
|
|
* subsequent interrupts.
|
|
*
|
|
* Workaround: The IOMMU driver should read back the
|
|
* status register and check if the interrupt bits are cleared.
|
|
* If not, driver will need to go through the interrupt handler
|
|
* again and re-clear the bits
|
|
*/
|
|
status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
irqreturn_t amd_iommu_int_handler(int irq, void *data)
|
|
{
|
|
return IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* IOMMU command queuing functions
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int wait_on_sem(volatile u64 *sem)
|
|
{
|
|
int i = 0;
|
|
|
|
while (*sem == 0 && i < LOOP_TIMEOUT) {
|
|
udelay(1);
|
|
i += 1;
|
|
}
|
|
|
|
if (i == LOOP_TIMEOUT) {
|
|
pr_alert("AMD-Vi: Completion-Wait loop timed out\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void copy_cmd_to_buffer(struct amd_iommu *iommu,
|
|
struct iommu_cmd *cmd)
|
|
{
|
|
u8 *target;
|
|
|
|
target = iommu->cmd_buf + iommu->cmd_buf_tail;
|
|
|
|
iommu->cmd_buf_tail += sizeof(*cmd);
|
|
iommu->cmd_buf_tail %= CMD_BUFFER_SIZE;
|
|
|
|
/* Copy command to buffer */
|
|
memcpy(target, cmd, sizeof(*cmd));
|
|
|
|
/* Tell the IOMMU about it */
|
|
writel(iommu->cmd_buf_tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
|
|
}
|
|
|
|
static void build_completion_wait(struct iommu_cmd *cmd, u64 address)
|
|
{
|
|
u64 paddr = iommu_virt_to_phys((void *)address);
|
|
|
|
WARN_ON(address & 0x7ULL);
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[0] = lower_32_bits(paddr) | CMD_COMPL_WAIT_STORE_MASK;
|
|
cmd->data[1] = upper_32_bits(paddr);
|
|
cmd->data[2] = 1;
|
|
CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
|
|
}
|
|
|
|
static void build_inv_dte(struct iommu_cmd *cmd, u16 devid)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[0] = devid;
|
|
CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY);
|
|
}
|
|
|
|
static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
|
|
size_t size, u16 domid, int pde)
|
|
{
|
|
u64 pages;
|
|
bool s;
|
|
|
|
pages = iommu_num_pages(address, size, PAGE_SIZE);
|
|
s = false;
|
|
|
|
if (pages > 1) {
|
|
/*
|
|
* If we have to flush more than one page, flush all
|
|
* TLB entries for this domain
|
|
*/
|
|
address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
|
|
s = true;
|
|
}
|
|
|
|
address &= PAGE_MASK;
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[1] |= domid;
|
|
cmd->data[2] = lower_32_bits(address);
|
|
cmd->data[3] = upper_32_bits(address);
|
|
CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
|
|
if (s) /* size bit - we flush more than one 4kb page */
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
|
|
if (pde) /* PDE bit - we want to flush everything, not only the PTEs */
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
|
|
}
|
|
|
|
static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep,
|
|
u64 address, size_t size)
|
|
{
|
|
u64 pages;
|
|
bool s;
|
|
|
|
pages = iommu_num_pages(address, size, PAGE_SIZE);
|
|
s = false;
|
|
|
|
if (pages > 1) {
|
|
/*
|
|
* If we have to flush more than one page, flush all
|
|
* TLB entries for this domain
|
|
*/
|
|
address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
|
|
s = true;
|
|
}
|
|
|
|
address &= PAGE_MASK;
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[0] = devid;
|
|
cmd->data[0] |= (qdep & 0xff) << 24;
|
|
cmd->data[1] = devid;
|
|
cmd->data[2] = lower_32_bits(address);
|
|
cmd->data[3] = upper_32_bits(address);
|
|
CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
|
|
if (s)
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
|
|
}
|
|
|
|
static void build_inv_iommu_pasid(struct iommu_cmd *cmd, u16 domid, int pasid,
|
|
u64 address, bool size)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
|
|
address &= ~(0xfffULL);
|
|
|
|
cmd->data[0] = pasid;
|
|
cmd->data[1] = domid;
|
|
cmd->data[2] = lower_32_bits(address);
|
|
cmd->data[3] = upper_32_bits(address);
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
|
|
if (size)
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
|
|
CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
|
|
}
|
|
|
|
static void build_inv_iotlb_pasid(struct iommu_cmd *cmd, u16 devid, int pasid,
|
|
int qdep, u64 address, bool size)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
|
|
address &= ~(0xfffULL);
|
|
|
|
cmd->data[0] = devid;
|
|
cmd->data[0] |= ((pasid >> 8) & 0xff) << 16;
|
|
cmd->data[0] |= (qdep & 0xff) << 24;
|
|
cmd->data[1] = devid;
|
|
cmd->data[1] |= (pasid & 0xff) << 16;
|
|
cmd->data[2] = lower_32_bits(address);
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
|
|
cmd->data[3] = upper_32_bits(address);
|
|
if (size)
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
|
|
CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
|
|
}
|
|
|
|
static void build_complete_ppr(struct iommu_cmd *cmd, u16 devid, int pasid,
|
|
int status, int tag, bool gn)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
|
|
cmd->data[0] = devid;
|
|
if (gn) {
|
|
cmd->data[1] = pasid;
|
|
cmd->data[2] = CMD_INV_IOMMU_PAGES_GN_MASK;
|
|
}
|
|
cmd->data[3] = tag & 0x1ff;
|
|
cmd->data[3] |= (status & PPR_STATUS_MASK) << PPR_STATUS_SHIFT;
|
|
|
|
CMD_SET_TYPE(cmd, CMD_COMPLETE_PPR);
|
|
}
|
|
|
|
static void build_inv_all(struct iommu_cmd *cmd)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
CMD_SET_TYPE(cmd, CMD_INV_ALL);
|
|
}
|
|
|
|
static void build_inv_irt(struct iommu_cmd *cmd, u16 devid)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[0] = devid;
|
|
CMD_SET_TYPE(cmd, CMD_INV_IRT);
|
|
}
|
|
|
|
/*
|
|
* Writes the command to the IOMMUs command buffer and informs the
|
|
* hardware about the new command.
|
|
*/
|
|
static int __iommu_queue_command_sync(struct amd_iommu *iommu,
|
|
struct iommu_cmd *cmd,
|
|
bool sync)
|
|
{
|
|
unsigned int count = 0;
|
|
u32 left, next_tail;
|
|
|
|
next_tail = (iommu->cmd_buf_tail + sizeof(*cmd)) % CMD_BUFFER_SIZE;
|
|
again:
|
|
left = (iommu->cmd_buf_head - next_tail) % CMD_BUFFER_SIZE;
|
|
|
|
if (left <= 0x20) {
|
|
/* Skip udelay() the first time around */
|
|
if (count++) {
|
|
if (count == LOOP_TIMEOUT) {
|
|
pr_err("AMD-Vi: Command buffer timeout\n");
|
|
return -EIO;
|
|
}
|
|
|
|
udelay(1);
|
|
}
|
|
|
|
/* Update head and recheck remaining space */
|
|
iommu->cmd_buf_head = readl(iommu->mmio_base +
|
|
MMIO_CMD_HEAD_OFFSET);
|
|
|
|
goto again;
|
|
}
|
|
|
|
copy_cmd_to_buffer(iommu, cmd);
|
|
|
|
/* Do we need to make sure all commands are processed? */
|
|
iommu->need_sync = sync;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_queue_command_sync(struct amd_iommu *iommu,
|
|
struct iommu_cmd *cmd,
|
|
bool sync)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
raw_spin_lock_irqsave(&iommu->lock, flags);
|
|
ret = __iommu_queue_command_sync(iommu, cmd, sync);
|
|
raw_spin_unlock_irqrestore(&iommu->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
|
|
{
|
|
return iommu_queue_command_sync(iommu, cmd, true);
|
|
}
|
|
|
|
/*
|
|
* This function queues a completion wait command into the command
|
|
* buffer of an IOMMU
|
|
*/
|
|
static int iommu_completion_wait(struct amd_iommu *iommu)
|
|
{
|
|
struct iommu_cmd cmd;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (!iommu->need_sync)
|
|
return 0;
|
|
|
|
|
|
build_completion_wait(&cmd, (u64)&iommu->cmd_sem);
|
|
|
|
raw_spin_lock_irqsave(&iommu->lock, flags);
|
|
|
|
iommu->cmd_sem = 0;
|
|
|
|
ret = __iommu_queue_command_sync(iommu, &cmd, false);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
ret = wait_on_sem(&iommu->cmd_sem);
|
|
|
|
out_unlock:
|
|
raw_spin_unlock_irqrestore(&iommu->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid)
|
|
{
|
|
struct iommu_cmd cmd;
|
|
|
|
build_inv_dte(&cmd, devid);
|
|
|
|
return iommu_queue_command(iommu, &cmd);
|
|
}
|
|
|
|
static void amd_iommu_flush_dte_all(struct amd_iommu *iommu)
|
|
{
|
|
u32 devid;
|
|
|
|
for (devid = 0; devid <= 0xffff; ++devid)
|
|
iommu_flush_dte(iommu, devid);
|
|
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
/*
|
|
* This function uses heavy locking and may disable irqs for some time. But
|
|
* this is no issue because it is only called during resume.
|
|
*/
|
|
static void amd_iommu_flush_tlb_all(struct amd_iommu *iommu)
|
|
{
|
|
u32 dom_id;
|
|
|
|
for (dom_id = 0; dom_id <= 0xffff; ++dom_id) {
|
|
struct iommu_cmd cmd;
|
|
build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
|
|
dom_id, 1);
|
|
iommu_queue_command(iommu, &cmd);
|
|
}
|
|
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
static void amd_iommu_flush_all(struct amd_iommu *iommu)
|
|
{
|
|
struct iommu_cmd cmd;
|
|
|
|
build_inv_all(&cmd);
|
|
|
|
iommu_queue_command(iommu, &cmd);
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
static void iommu_flush_irt(struct amd_iommu *iommu, u16 devid)
|
|
{
|
|
struct iommu_cmd cmd;
|
|
|
|
build_inv_irt(&cmd, devid);
|
|
|
|
iommu_queue_command(iommu, &cmd);
|
|
}
|
|
|
|
static void amd_iommu_flush_irt_all(struct amd_iommu *iommu)
|
|
{
|
|
u32 devid;
|
|
|
|
for (devid = 0; devid <= MAX_DEV_TABLE_ENTRIES; devid++)
|
|
iommu_flush_irt(iommu, devid);
|
|
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
void iommu_flush_all_caches(struct amd_iommu *iommu)
|
|
{
|
|
if (iommu_feature(iommu, FEATURE_IA)) {
|
|
amd_iommu_flush_all(iommu);
|
|
} else {
|
|
amd_iommu_flush_dte_all(iommu);
|
|
amd_iommu_flush_irt_all(iommu);
|
|
amd_iommu_flush_tlb_all(iommu);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Command send function for flushing on-device TLB
|
|
*/
|
|
static int device_flush_iotlb(struct iommu_dev_data *dev_data,
|
|
u64 address, size_t size)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
struct iommu_cmd cmd;
|
|
int qdep;
|
|
|
|
qdep = dev_data->ats.qdep;
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
|
|
build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size);
|
|
|
|
return iommu_queue_command(iommu, &cmd);
|
|
}
|
|
|
|
/*
|
|
* Command send function for invalidating a device table entry
|
|
*/
|
|
static int device_flush_dte(struct iommu_dev_data *dev_data)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
u16 alias;
|
|
int ret;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
alias = dev_data->alias;
|
|
|
|
ret = iommu_flush_dte(iommu, dev_data->devid);
|
|
if (!ret && alias != dev_data->devid)
|
|
ret = iommu_flush_dte(iommu, alias);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (dev_data->ats.enabled)
|
|
ret = device_flush_iotlb(dev_data, 0, ~0UL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* TLB invalidation function which is called from the mapping functions.
|
|
* It invalidates a single PTE if the range to flush is within a single
|
|
* page. Otherwise it flushes the whole TLB of the IOMMU.
|
|
*/
|
|
static void __domain_flush_pages(struct protection_domain *domain,
|
|
u64 address, size_t size, int pde)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct iommu_cmd cmd;
|
|
int ret = 0, i;
|
|
|
|
build_inv_iommu_pages(&cmd, address, size, domain->id, pde);
|
|
|
|
for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
|
|
if (!domain->dev_iommu[i])
|
|
continue;
|
|
|
|
/*
|
|
* Devices of this domain are behind this IOMMU
|
|
* We need a TLB flush
|
|
*/
|
|
ret |= iommu_queue_command(amd_iommus[i], &cmd);
|
|
}
|
|
|
|
list_for_each_entry(dev_data, &domain->dev_list, list) {
|
|
|
|
if (!dev_data->ats.enabled)
|
|
continue;
|
|
|
|
ret |= device_flush_iotlb(dev_data, address, size);
|
|
}
|
|
|
|
WARN_ON(ret);
|
|
}
|
|
|
|
static void domain_flush_pages(struct protection_domain *domain,
|
|
u64 address, size_t size)
|
|
{
|
|
__domain_flush_pages(domain, address, size, 0);
|
|
}
|
|
|
|
/* Flush the whole IO/TLB for a given protection domain */
|
|
static void domain_flush_tlb(struct protection_domain *domain)
|
|
{
|
|
__domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0);
|
|
}
|
|
|
|
/* Flush the whole IO/TLB for a given protection domain - including PDE */
|
|
static void domain_flush_tlb_pde(struct protection_domain *domain)
|
|
{
|
|
__domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1);
|
|
}
|
|
|
|
static void domain_flush_complete(struct protection_domain *domain)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
|
|
if (domain && !domain->dev_iommu[i])
|
|
continue;
|
|
|
|
/*
|
|
* Devices of this domain are behind this IOMMU
|
|
* We need to wait for completion of all commands.
|
|
*/
|
|
iommu_completion_wait(amd_iommus[i]);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* This function flushes the DTEs for all devices in domain
|
|
*/
|
|
static void domain_flush_devices(struct protection_domain *domain)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
|
|
list_for_each_entry(dev_data, &domain->dev_list, list)
|
|
device_flush_dte(dev_data);
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* The functions below are used the create the page table mappings for
|
|
* unity mapped regions.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* This function is used to add another level to an IO page table. Adding
|
|
* another level increases the size of the address space by 9 bits to a size up
|
|
* to 64 bits.
|
|
*/
|
|
static bool increase_address_space(struct protection_domain *domain,
|
|
gfp_t gfp)
|
|
{
|
|
u64 *pte;
|
|
|
|
if (domain->mode == PAGE_MODE_6_LEVEL)
|
|
/* address space already 64 bit large */
|
|
return false;
|
|
|
|
pte = (void *)get_zeroed_page(gfp);
|
|
if (!pte)
|
|
return false;
|
|
|
|
*pte = PM_LEVEL_PDE(domain->mode,
|
|
iommu_virt_to_phys(domain->pt_root));
|
|
domain->pt_root = pte;
|
|
domain->mode += 1;
|
|
domain->updated = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
static u64 *alloc_pte(struct protection_domain *domain,
|
|
unsigned long address,
|
|
unsigned long page_size,
|
|
u64 **pte_page,
|
|
gfp_t gfp)
|
|
{
|
|
int level, end_lvl;
|
|
u64 *pte, *page;
|
|
|
|
BUG_ON(!is_power_of_2(page_size));
|
|
|
|
while (address > PM_LEVEL_SIZE(domain->mode))
|
|
increase_address_space(domain, gfp);
|
|
|
|
level = domain->mode - 1;
|
|
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
|
|
address = PAGE_SIZE_ALIGN(address, page_size);
|
|
end_lvl = PAGE_SIZE_LEVEL(page_size);
|
|
|
|
while (level > end_lvl) {
|
|
u64 __pte, __npte;
|
|
|
|
__pte = *pte;
|
|
|
|
if (!IOMMU_PTE_PRESENT(__pte)) {
|
|
page = (u64 *)get_zeroed_page(gfp);
|
|
if (!page)
|
|
return NULL;
|
|
|
|
__npte = PM_LEVEL_PDE(level, iommu_virt_to_phys(page));
|
|
|
|
/* pte could have been changed somewhere. */
|
|
if (cmpxchg64(pte, __pte, __npte) != __pte) {
|
|
free_page((unsigned long)page);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* No level skipping support yet */
|
|
if (PM_PTE_LEVEL(*pte) != level)
|
|
return NULL;
|
|
|
|
level -= 1;
|
|
|
|
pte = IOMMU_PTE_PAGE(*pte);
|
|
|
|
if (pte_page && level == end_lvl)
|
|
*pte_page = pte;
|
|
|
|
pte = &pte[PM_LEVEL_INDEX(level, address)];
|
|
}
|
|
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* This function checks if there is a PTE for a given dma address. If
|
|
* there is one, it returns the pointer to it.
|
|
*/
|
|
static u64 *fetch_pte(struct protection_domain *domain,
|
|
unsigned long address,
|
|
unsigned long *page_size)
|
|
{
|
|
int level;
|
|
u64 *pte;
|
|
|
|
*page_size = 0;
|
|
|
|
if (address > PM_LEVEL_SIZE(domain->mode))
|
|
return NULL;
|
|
|
|
level = domain->mode - 1;
|
|
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
|
|
*page_size = PTE_LEVEL_PAGE_SIZE(level);
|
|
|
|
while (level > 0) {
|
|
|
|
/* Not Present */
|
|
if (!IOMMU_PTE_PRESENT(*pte))
|
|
return NULL;
|
|
|
|
/* Large PTE */
|
|
if (PM_PTE_LEVEL(*pte) == 7 ||
|
|
PM_PTE_LEVEL(*pte) == 0)
|
|
break;
|
|
|
|
/* No level skipping support yet */
|
|
if (PM_PTE_LEVEL(*pte) != level)
|
|
return NULL;
|
|
|
|
level -= 1;
|
|
|
|
/* Walk to the next level */
|
|
pte = IOMMU_PTE_PAGE(*pte);
|
|
pte = &pte[PM_LEVEL_INDEX(level, address)];
|
|
*page_size = PTE_LEVEL_PAGE_SIZE(level);
|
|
}
|
|
|
|
if (PM_PTE_LEVEL(*pte) == 0x07) {
|
|
unsigned long pte_mask;
|
|
|
|
/*
|
|
* If we have a series of large PTEs, make
|
|
* sure to return a pointer to the first one.
|
|
*/
|
|
*page_size = pte_mask = PTE_PAGE_SIZE(*pte);
|
|
pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1);
|
|
pte = (u64 *)(((unsigned long)pte) & pte_mask);
|
|
}
|
|
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* Generic mapping functions. It maps a physical address into a DMA
|
|
* address space. It allocates the page table pages if necessary.
|
|
* In the future it can be extended to a generic mapping function
|
|
* supporting all features of AMD IOMMU page tables like level skipping
|
|
* and full 64 bit address spaces.
|
|
*/
|
|
static int iommu_map_page(struct protection_domain *dom,
|
|
unsigned long bus_addr,
|
|
unsigned long phys_addr,
|
|
unsigned long page_size,
|
|
int prot,
|
|
gfp_t gfp)
|
|
{
|
|
u64 __pte, *pte;
|
|
int i, count;
|
|
|
|
BUG_ON(!IS_ALIGNED(bus_addr, page_size));
|
|
BUG_ON(!IS_ALIGNED(phys_addr, page_size));
|
|
|
|
if (!(prot & IOMMU_PROT_MASK))
|
|
return -EINVAL;
|
|
|
|
count = PAGE_SIZE_PTE_COUNT(page_size);
|
|
pte = alloc_pte(dom, bus_addr, page_size, NULL, gfp);
|
|
|
|
if (!pte)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < count; ++i)
|
|
if (IOMMU_PTE_PRESENT(pte[i]))
|
|
return -EBUSY;
|
|
|
|
if (count > 1) {
|
|
__pte = PAGE_SIZE_PTE(__sme_set(phys_addr), page_size);
|
|
__pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_PR | IOMMU_PTE_FC;
|
|
} else
|
|
__pte = __sme_set(phys_addr) | IOMMU_PTE_PR | IOMMU_PTE_FC;
|
|
|
|
if (prot & IOMMU_PROT_IR)
|
|
__pte |= IOMMU_PTE_IR;
|
|
if (prot & IOMMU_PROT_IW)
|
|
__pte |= IOMMU_PTE_IW;
|
|
|
|
for (i = 0; i < count; ++i)
|
|
pte[i] = __pte;
|
|
|
|
update_domain(dom);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long iommu_unmap_page(struct protection_domain *dom,
|
|
unsigned long bus_addr,
|
|
unsigned long page_size)
|
|
{
|
|
unsigned long long unmapped;
|
|
unsigned long unmap_size;
|
|
u64 *pte;
|
|
|
|
BUG_ON(!is_power_of_2(page_size));
|
|
|
|
unmapped = 0;
|
|
|
|
while (unmapped < page_size) {
|
|
|
|
pte = fetch_pte(dom, bus_addr, &unmap_size);
|
|
|
|
if (pte) {
|
|
int i, count;
|
|
|
|
count = PAGE_SIZE_PTE_COUNT(unmap_size);
|
|
for (i = 0; i < count; i++)
|
|
pte[i] = 0ULL;
|
|
}
|
|
|
|
bus_addr = (bus_addr & ~(unmap_size - 1)) + unmap_size;
|
|
unmapped += unmap_size;
|
|
}
|
|
|
|
BUG_ON(unmapped && !is_power_of_2(unmapped));
|
|
|
|
return unmapped;
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* The next functions belong to the address allocator for the dma_ops
|
|
* interface functions.
|
|
*
|
|
****************************************************************************/
|
|
|
|
|
|
static unsigned long dma_ops_alloc_iova(struct device *dev,
|
|
struct dma_ops_domain *dma_dom,
|
|
unsigned int pages, u64 dma_mask)
|
|
{
|
|
unsigned long pfn = 0;
|
|
|
|
pages = __roundup_pow_of_two(pages);
|
|
|
|
if (dma_mask > DMA_BIT_MASK(32))
|
|
pfn = alloc_iova_fast(&dma_dom->iovad, pages,
|
|
IOVA_PFN(DMA_BIT_MASK(32)), false);
|
|
|
|
if (!pfn)
|
|
pfn = alloc_iova_fast(&dma_dom->iovad, pages,
|
|
IOVA_PFN(dma_mask), true);
|
|
|
|
return (pfn << PAGE_SHIFT);
|
|
}
|
|
|
|
static void dma_ops_free_iova(struct dma_ops_domain *dma_dom,
|
|
unsigned long address,
|
|
unsigned int pages)
|
|
{
|
|
pages = __roundup_pow_of_two(pages);
|
|
address >>= PAGE_SHIFT;
|
|
|
|
free_iova_fast(&dma_dom->iovad, address, pages);
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* The next functions belong to the domain allocation. A domain is
|
|
* allocated for every IOMMU as the default domain. If device isolation
|
|
* is enabled, every device get its own domain. The most important thing
|
|
* about domains is the page table mapping the DMA address space they
|
|
* contain.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* This function adds a protection domain to the global protection domain list
|
|
*/
|
|
static void add_domain_to_list(struct protection_domain *domain)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&amd_iommu_pd_lock, flags);
|
|
list_add(&domain->list, &amd_iommu_pd_list);
|
|
spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* This function removes a protection domain to the global
|
|
* protection domain list
|
|
*/
|
|
static void del_domain_from_list(struct protection_domain *domain)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&amd_iommu_pd_lock, flags);
|
|
list_del(&domain->list);
|
|
spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
|
|
}
|
|
|
|
static u16 domain_id_alloc(void)
|
|
{
|
|
int id;
|
|
|
|
spin_lock(&pd_bitmap_lock);
|
|
id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
|
|
BUG_ON(id == 0);
|
|
if (id > 0 && id < MAX_DOMAIN_ID)
|
|
__set_bit(id, amd_iommu_pd_alloc_bitmap);
|
|
else
|
|
id = 0;
|
|
spin_unlock(&pd_bitmap_lock);
|
|
|
|
return id;
|
|
}
|
|
|
|
static void domain_id_free(int id)
|
|
{
|
|
spin_lock(&pd_bitmap_lock);
|
|
if (id > 0 && id < MAX_DOMAIN_ID)
|
|
__clear_bit(id, amd_iommu_pd_alloc_bitmap);
|
|
spin_unlock(&pd_bitmap_lock);
|
|
}
|
|
|
|
#define DEFINE_FREE_PT_FN(LVL, FN) \
|
|
static void free_pt_##LVL (unsigned long __pt) \
|
|
{ \
|
|
unsigned long p; \
|
|
u64 *pt; \
|
|
int i; \
|
|
\
|
|
pt = (u64 *)__pt; \
|
|
\
|
|
for (i = 0; i < 512; ++i) { \
|
|
/* PTE present? */ \
|
|
if (!IOMMU_PTE_PRESENT(pt[i])) \
|
|
continue; \
|
|
\
|
|
/* Large PTE? */ \
|
|
if (PM_PTE_LEVEL(pt[i]) == 0 || \
|
|
PM_PTE_LEVEL(pt[i]) == 7) \
|
|
continue; \
|
|
\
|
|
p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \
|
|
FN(p); \
|
|
} \
|
|
free_page((unsigned long)pt); \
|
|
}
|
|
|
|
DEFINE_FREE_PT_FN(l2, free_page)
|
|
DEFINE_FREE_PT_FN(l3, free_pt_l2)
|
|
DEFINE_FREE_PT_FN(l4, free_pt_l3)
|
|
DEFINE_FREE_PT_FN(l5, free_pt_l4)
|
|
DEFINE_FREE_PT_FN(l6, free_pt_l5)
|
|
|
|
static void free_pagetable(struct protection_domain *domain)
|
|
{
|
|
unsigned long root = (unsigned long)domain->pt_root;
|
|
|
|
switch (domain->mode) {
|
|
case PAGE_MODE_NONE:
|
|
break;
|
|
case PAGE_MODE_1_LEVEL:
|
|
free_page(root);
|
|
break;
|
|
case PAGE_MODE_2_LEVEL:
|
|
free_pt_l2(root);
|
|
break;
|
|
case PAGE_MODE_3_LEVEL:
|
|
free_pt_l3(root);
|
|
break;
|
|
case PAGE_MODE_4_LEVEL:
|
|
free_pt_l4(root);
|
|
break;
|
|
case PAGE_MODE_5_LEVEL:
|
|
free_pt_l5(root);
|
|
break;
|
|
case PAGE_MODE_6_LEVEL:
|
|
free_pt_l6(root);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static void free_gcr3_tbl_level1(u64 *tbl)
|
|
{
|
|
u64 *ptr;
|
|
int i;
|
|
|
|
for (i = 0; i < 512; ++i) {
|
|
if (!(tbl[i] & GCR3_VALID))
|
|
continue;
|
|
|
|
ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK);
|
|
|
|
free_page((unsigned long)ptr);
|
|
}
|
|
}
|
|
|
|
static void free_gcr3_tbl_level2(u64 *tbl)
|
|
{
|
|
u64 *ptr;
|
|
int i;
|
|
|
|
for (i = 0; i < 512; ++i) {
|
|
if (!(tbl[i] & GCR3_VALID))
|
|
continue;
|
|
|
|
ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK);
|
|
|
|
free_gcr3_tbl_level1(ptr);
|
|
}
|
|
}
|
|
|
|
static void free_gcr3_table(struct protection_domain *domain)
|
|
{
|
|
if (domain->glx == 2)
|
|
free_gcr3_tbl_level2(domain->gcr3_tbl);
|
|
else if (domain->glx == 1)
|
|
free_gcr3_tbl_level1(domain->gcr3_tbl);
|
|
else
|
|
BUG_ON(domain->glx != 0);
|
|
|
|
free_page((unsigned long)domain->gcr3_tbl);
|
|
}
|
|
|
|
static void dma_ops_domain_flush_tlb(struct dma_ops_domain *dom)
|
|
{
|
|
domain_flush_tlb(&dom->domain);
|
|
domain_flush_complete(&dom->domain);
|
|
}
|
|
|
|
static void iova_domain_flush_tlb(struct iova_domain *iovad)
|
|
{
|
|
struct dma_ops_domain *dom;
|
|
|
|
dom = container_of(iovad, struct dma_ops_domain, iovad);
|
|
|
|
dma_ops_domain_flush_tlb(dom);
|
|
}
|
|
|
|
/*
|
|
* Free a domain, only used if something went wrong in the
|
|
* allocation path and we need to free an already allocated page table
|
|
*/
|
|
static void dma_ops_domain_free(struct dma_ops_domain *dom)
|
|
{
|
|
if (!dom)
|
|
return;
|
|
|
|
del_domain_from_list(&dom->domain);
|
|
|
|
put_iova_domain(&dom->iovad);
|
|
|
|
free_pagetable(&dom->domain);
|
|
|
|
if (dom->domain.id)
|
|
domain_id_free(dom->domain.id);
|
|
|
|
kfree(dom);
|
|
}
|
|
|
|
/*
|
|
* Allocates a new protection domain usable for the dma_ops functions.
|
|
* It also initializes the page table and the address allocator data
|
|
* structures required for the dma_ops interface
|
|
*/
|
|
static struct dma_ops_domain *dma_ops_domain_alloc(void)
|
|
{
|
|
struct dma_ops_domain *dma_dom;
|
|
|
|
dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);
|
|
if (!dma_dom)
|
|
return NULL;
|
|
|
|
if (protection_domain_init(&dma_dom->domain))
|
|
goto free_dma_dom;
|
|
|
|
dma_dom->domain.mode = PAGE_MODE_3_LEVEL;
|
|
dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
|
|
dma_dom->domain.flags = PD_DMA_OPS_MASK;
|
|
if (!dma_dom->domain.pt_root)
|
|
goto free_dma_dom;
|
|
|
|
init_iova_domain(&dma_dom->iovad, PAGE_SIZE, IOVA_START_PFN);
|
|
|
|
if (init_iova_flush_queue(&dma_dom->iovad, iova_domain_flush_tlb, NULL))
|
|
goto free_dma_dom;
|
|
|
|
/* Initialize reserved ranges */
|
|
copy_reserved_iova(&reserved_iova_ranges, &dma_dom->iovad);
|
|
|
|
add_domain_to_list(&dma_dom->domain);
|
|
|
|
return dma_dom;
|
|
|
|
free_dma_dom:
|
|
dma_ops_domain_free(dma_dom);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* little helper function to check whether a given protection domain is a
|
|
* dma_ops domain
|
|
*/
|
|
static bool dma_ops_domain(struct protection_domain *domain)
|
|
{
|
|
return domain->flags & PD_DMA_OPS_MASK;
|
|
}
|
|
|
|
static void set_dte_entry(u16 devid, struct protection_domain *domain,
|
|
bool ats, bool ppr)
|
|
{
|
|
u64 pte_root = 0;
|
|
u64 flags = 0;
|
|
|
|
if (domain->mode != PAGE_MODE_NONE)
|
|
pte_root = iommu_virt_to_phys(domain->pt_root);
|
|
|
|
pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
|
|
<< DEV_ENTRY_MODE_SHIFT;
|
|
pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV;
|
|
|
|
flags = amd_iommu_dev_table[devid].data[1];
|
|
|
|
if (ats)
|
|
flags |= DTE_FLAG_IOTLB;
|
|
|
|
if (ppr) {
|
|
struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
|
|
|
|
if (iommu_feature(iommu, FEATURE_EPHSUP))
|
|
pte_root |= 1ULL << DEV_ENTRY_PPR;
|
|
}
|
|
|
|
if (domain->flags & PD_IOMMUV2_MASK) {
|
|
u64 gcr3 = iommu_virt_to_phys(domain->gcr3_tbl);
|
|
u64 glx = domain->glx;
|
|
u64 tmp;
|
|
|
|
pte_root |= DTE_FLAG_GV;
|
|
pte_root |= (glx & DTE_GLX_MASK) << DTE_GLX_SHIFT;
|
|
|
|
/* First mask out possible old values for GCR3 table */
|
|
tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
|
|
flags &= ~tmp;
|
|
|
|
tmp = DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
|
|
flags &= ~tmp;
|
|
|
|
/* Encode GCR3 table into DTE */
|
|
tmp = DTE_GCR3_VAL_A(gcr3) << DTE_GCR3_SHIFT_A;
|
|
pte_root |= tmp;
|
|
|
|
tmp = DTE_GCR3_VAL_B(gcr3) << DTE_GCR3_SHIFT_B;
|
|
flags |= tmp;
|
|
|
|
tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C;
|
|
flags |= tmp;
|
|
}
|
|
|
|
flags &= ~DEV_DOMID_MASK;
|
|
flags |= domain->id;
|
|
|
|
amd_iommu_dev_table[devid].data[1] = flags;
|
|
amd_iommu_dev_table[devid].data[0] = pte_root;
|
|
}
|
|
|
|
static void clear_dte_entry(u16 devid)
|
|
{
|
|
/* remove entry from the device table seen by the hardware */
|
|
amd_iommu_dev_table[devid].data[0] = DTE_FLAG_V | DTE_FLAG_TV;
|
|
amd_iommu_dev_table[devid].data[1] &= DTE_FLAG_MASK;
|
|
|
|
amd_iommu_apply_erratum_63(devid);
|
|
}
|
|
|
|
static void do_attach(struct iommu_dev_data *dev_data,
|
|
struct protection_domain *domain)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
u16 alias;
|
|
bool ats;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
alias = dev_data->alias;
|
|
ats = dev_data->ats.enabled;
|
|
|
|
/* Update data structures */
|
|
dev_data->domain = domain;
|
|
list_add(&dev_data->list, &domain->dev_list);
|
|
|
|
/* Do reference counting */
|
|
domain->dev_iommu[iommu->index] += 1;
|
|
domain->dev_cnt += 1;
|
|
|
|
/* Update device table */
|
|
set_dte_entry(dev_data->devid, domain, ats, dev_data->iommu_v2);
|
|
if (alias != dev_data->devid)
|
|
set_dte_entry(alias, domain, ats, dev_data->iommu_v2);
|
|
|
|
device_flush_dte(dev_data);
|
|
}
|
|
|
|
static void do_detach(struct iommu_dev_data *dev_data)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
u16 alias;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
alias = dev_data->alias;
|
|
|
|
/* decrease reference counters */
|
|
dev_data->domain->dev_iommu[iommu->index] -= 1;
|
|
dev_data->domain->dev_cnt -= 1;
|
|
|
|
/* Update data structures */
|
|
dev_data->domain = NULL;
|
|
list_del(&dev_data->list);
|
|
clear_dte_entry(dev_data->devid);
|
|
if (alias != dev_data->devid)
|
|
clear_dte_entry(alias);
|
|
|
|
/* Flush the DTE entry */
|
|
device_flush_dte(dev_data);
|
|
}
|
|
|
|
/*
|
|
* If a device is not yet associated with a domain, this function makes the
|
|
* device visible in the domain
|
|
*/
|
|
static int __attach_device(struct iommu_dev_data *dev_data,
|
|
struct protection_domain *domain)
|
|
{
|
|
int ret;
|
|
|
|
/* lock domain */
|
|
spin_lock(&domain->lock);
|
|
|
|
ret = -EBUSY;
|
|
if (dev_data->domain != NULL)
|
|
goto out_unlock;
|
|
|
|
/* Attach alias group root */
|
|
do_attach(dev_data, domain);
|
|
|
|
ret = 0;
|
|
|
|
out_unlock:
|
|
|
|
/* ready */
|
|
spin_unlock(&domain->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void pdev_iommuv2_disable(struct pci_dev *pdev)
|
|
{
|
|
pci_disable_ats(pdev);
|
|
pci_disable_pri(pdev);
|
|
pci_disable_pasid(pdev);
|
|
}
|
|
|
|
/* FIXME: Change generic reset-function to do the same */
|
|
static int pri_reset_while_enabled(struct pci_dev *pdev)
|
|
{
|
|
u16 control;
|
|
int pos;
|
|
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
|
|
if (!pos)
|
|
return -EINVAL;
|
|
|
|
pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
|
|
control |= PCI_PRI_CTRL_RESET;
|
|
pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pdev_iommuv2_enable(struct pci_dev *pdev)
|
|
{
|
|
bool reset_enable;
|
|
int reqs, ret;
|
|
|
|
/* FIXME: Hardcode number of outstanding requests for now */
|
|
reqs = 32;
|
|
if (pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE))
|
|
reqs = 1;
|
|
reset_enable = pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_ENABLE_RESET);
|
|
|
|
/* Only allow access to user-accessible pages */
|
|
ret = pci_enable_pasid(pdev, 0);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/* First reset the PRI state of the device */
|
|
ret = pci_reset_pri(pdev);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/* Enable PRI */
|
|
ret = pci_enable_pri(pdev, reqs);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
if (reset_enable) {
|
|
ret = pri_reset_while_enabled(pdev);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
ret = pci_enable_ats(pdev, PAGE_SHIFT);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
pci_disable_pri(pdev);
|
|
pci_disable_pasid(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* FIXME: Move this to PCI code */
|
|
#define PCI_PRI_TLP_OFF (1 << 15)
|
|
|
|
static bool pci_pri_tlp_required(struct pci_dev *pdev)
|
|
{
|
|
u16 status;
|
|
int pos;
|
|
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
|
|
if (!pos)
|
|
return false;
|
|
|
|
pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
|
|
|
|
return (status & PCI_PRI_TLP_OFF) ? true : false;
|
|
}
|
|
|
|
/*
|
|
* If a device is not yet associated with a domain, this function makes the
|
|
* device visible in the domain
|
|
*/
|
|
static int attach_device(struct device *dev,
|
|
struct protection_domain *domain)
|
|
{
|
|
struct pci_dev *pdev;
|
|
struct iommu_dev_data *dev_data;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
dev_data = get_dev_data(dev);
|
|
|
|
if (!dev_is_pci(dev))
|
|
goto skip_ats_check;
|
|
|
|
pdev = to_pci_dev(dev);
|
|
if (domain->flags & PD_IOMMUV2_MASK) {
|
|
if (!dev_data->passthrough)
|
|
return -EINVAL;
|
|
|
|
if (dev_data->iommu_v2) {
|
|
if (pdev_iommuv2_enable(pdev) != 0)
|
|
return -EINVAL;
|
|
|
|
dev_data->ats.enabled = true;
|
|
dev_data->ats.qdep = pci_ats_queue_depth(pdev);
|
|
dev_data->pri_tlp = pci_pri_tlp_required(pdev);
|
|
}
|
|
} else if (amd_iommu_iotlb_sup &&
|
|
pci_enable_ats(pdev, PAGE_SHIFT) == 0) {
|
|
dev_data->ats.enabled = true;
|
|
dev_data->ats.qdep = pci_ats_queue_depth(pdev);
|
|
}
|
|
|
|
skip_ats_check:
|
|
spin_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
ret = __attach_device(dev_data, domain);
|
|
spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
|
|
/*
|
|
* We might boot into a crash-kernel here. The crashed kernel
|
|
* left the caches in the IOMMU dirty. So we have to flush
|
|
* here to evict all dirty stuff.
|
|
*/
|
|
domain_flush_tlb_pde(domain);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Removes a device from a protection domain (unlocked)
|
|
*/
|
|
static void __detach_device(struct iommu_dev_data *dev_data)
|
|
{
|
|
struct protection_domain *domain;
|
|
|
|
domain = dev_data->domain;
|
|
|
|
spin_lock(&domain->lock);
|
|
|
|
do_detach(dev_data);
|
|
|
|
spin_unlock(&domain->lock);
|
|
}
|
|
|
|
/*
|
|
* Removes a device from a protection domain (with devtable_lock held)
|
|
*/
|
|
static void detach_device(struct device *dev)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct iommu_dev_data *dev_data;
|
|
unsigned long flags;
|
|
|
|
dev_data = get_dev_data(dev);
|
|
domain = dev_data->domain;
|
|
|
|
/*
|
|
* First check if the device is still attached. It might already
|
|
* be detached from its domain because the generic
|
|
* iommu_detach_group code detached it and we try again here in
|
|
* our alias handling.
|
|
*/
|
|
if (WARN_ON(!dev_data->domain))
|
|
return;
|
|
|
|
/* lock device table */
|
|
spin_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
__detach_device(dev_data);
|
|
spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
|
|
if (!dev_is_pci(dev))
|
|
return;
|
|
|
|
if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2)
|
|
pdev_iommuv2_disable(to_pci_dev(dev));
|
|
else if (dev_data->ats.enabled)
|
|
pci_disable_ats(to_pci_dev(dev));
|
|
|
|
dev_data->ats.enabled = false;
|
|
}
|
|
|
|
static int amd_iommu_add_device(struct device *dev)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct iommu_domain *domain;
|
|
struct amd_iommu *iommu;
|
|
int ret, devid;
|
|
|
|
if (!check_device(dev) || get_dev_data(dev))
|
|
return 0;
|
|
|
|
devid = get_device_id(dev);
|
|
if (devid < 0)
|
|
return devid;
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
|
|
ret = iommu_init_device(dev);
|
|
if (ret) {
|
|
if (ret != -ENOTSUPP)
|
|
pr_err("Failed to initialize device %s - trying to proceed anyway\n",
|
|
dev_name(dev));
|
|
|
|
iommu_ignore_device(dev);
|
|
dev->dma_ops = &dma_direct_ops;
|
|
goto out;
|
|
}
|
|
init_iommu_group(dev);
|
|
|
|
dev_data = get_dev_data(dev);
|
|
|
|
BUG_ON(!dev_data);
|
|
|
|
if (iommu_pass_through || dev_data->iommu_v2)
|
|
iommu_request_dm_for_dev(dev);
|
|
|
|
/* Domains are initialized for this device - have a look what we ended up with */
|
|
domain = iommu_get_domain_for_dev(dev);
|
|
if (domain->type == IOMMU_DOMAIN_IDENTITY)
|
|
dev_data->passthrough = true;
|
|
else
|
|
dev->dma_ops = &amd_iommu_dma_ops;
|
|
|
|
out:
|
|
iommu_completion_wait(iommu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void amd_iommu_remove_device(struct device *dev)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
int devid;
|
|
|
|
if (!check_device(dev))
|
|
return;
|
|
|
|
devid = get_device_id(dev);
|
|
if (devid < 0)
|
|
return;
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
|
|
iommu_uninit_device(dev);
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
static struct iommu_group *amd_iommu_device_group(struct device *dev)
|
|
{
|
|
if (dev_is_pci(dev))
|
|
return pci_device_group(dev);
|
|
|
|
return acpihid_device_group(dev);
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* The next functions belong to the dma_ops mapping/unmapping code.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* In the dma_ops path we only have the struct device. This function
|
|
* finds the corresponding IOMMU, the protection domain and the
|
|
* requestor id for a given device.
|
|
* If the device is not yet associated with a domain this is also done
|
|
* in this function.
|
|
*/
|
|
static struct protection_domain *get_domain(struct device *dev)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct iommu_domain *io_domain;
|
|
|
|
if (!check_device(dev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
domain = get_dev_data(dev)->domain;
|
|
if (domain == NULL && get_dev_data(dev)->defer_attach) {
|
|
get_dev_data(dev)->defer_attach = false;
|
|
io_domain = iommu_get_domain_for_dev(dev);
|
|
domain = to_pdomain(io_domain);
|
|
attach_device(dev, domain);
|
|
}
|
|
if (domain == NULL)
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
if (!dma_ops_domain(domain))
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
return domain;
|
|
}
|
|
|
|
static void update_device_table(struct protection_domain *domain)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
|
|
list_for_each_entry(dev_data, &domain->dev_list, list) {
|
|
set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled,
|
|
dev_data->iommu_v2);
|
|
|
|
if (dev_data->devid == dev_data->alias)
|
|
continue;
|
|
|
|
/* There is an alias, update device table entry for it */
|
|
set_dte_entry(dev_data->alias, domain, dev_data->ats.enabled,
|
|
dev_data->iommu_v2);
|
|
}
|
|
}
|
|
|
|
static void update_domain(struct protection_domain *domain)
|
|
{
|
|
if (!domain->updated)
|
|
return;
|
|
|
|
update_device_table(domain);
|
|
|
|
domain_flush_devices(domain);
|
|
domain_flush_tlb_pde(domain);
|
|
|
|
domain->updated = false;
|
|
}
|
|
|
|
static int dir2prot(enum dma_data_direction direction)
|
|
{
|
|
if (direction == DMA_TO_DEVICE)
|
|
return IOMMU_PROT_IR;
|
|
else if (direction == DMA_FROM_DEVICE)
|
|
return IOMMU_PROT_IW;
|
|
else if (direction == DMA_BIDIRECTIONAL)
|
|
return IOMMU_PROT_IW | IOMMU_PROT_IR;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function contains common code for mapping of a physically
|
|
* contiguous memory region into DMA address space. It is used by all
|
|
* mapping functions provided with this IOMMU driver.
|
|
* Must be called with the domain lock held.
|
|
*/
|
|
static dma_addr_t __map_single(struct device *dev,
|
|
struct dma_ops_domain *dma_dom,
|
|
phys_addr_t paddr,
|
|
size_t size,
|
|
enum dma_data_direction direction,
|
|
u64 dma_mask)
|
|
{
|
|
dma_addr_t offset = paddr & ~PAGE_MASK;
|
|
dma_addr_t address, start, ret;
|
|
unsigned int pages;
|
|
int prot = 0;
|
|
int i;
|
|
|
|
pages = iommu_num_pages(paddr, size, PAGE_SIZE);
|
|
paddr &= PAGE_MASK;
|
|
|
|
address = dma_ops_alloc_iova(dev, dma_dom, pages, dma_mask);
|
|
if (address == AMD_IOMMU_MAPPING_ERROR)
|
|
goto out;
|
|
|
|
prot = dir2prot(direction);
|
|
|
|
start = address;
|
|
for (i = 0; i < pages; ++i) {
|
|
ret = iommu_map_page(&dma_dom->domain, start, paddr,
|
|
PAGE_SIZE, prot, GFP_ATOMIC);
|
|
if (ret)
|
|
goto out_unmap;
|
|
|
|
paddr += PAGE_SIZE;
|
|
start += PAGE_SIZE;
|
|
}
|
|
address += offset;
|
|
|
|
if (unlikely(amd_iommu_np_cache)) {
|
|
domain_flush_pages(&dma_dom->domain, address, size);
|
|
domain_flush_complete(&dma_dom->domain);
|
|
}
|
|
|
|
out:
|
|
return address;
|
|
|
|
out_unmap:
|
|
|
|
for (--i; i >= 0; --i) {
|
|
start -= PAGE_SIZE;
|
|
iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE);
|
|
}
|
|
|
|
domain_flush_tlb(&dma_dom->domain);
|
|
domain_flush_complete(&dma_dom->domain);
|
|
|
|
dma_ops_free_iova(dma_dom, address, pages);
|
|
|
|
return AMD_IOMMU_MAPPING_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Does the reverse of the __map_single function. Must be called with
|
|
* the domain lock held too
|
|
*/
|
|
static void __unmap_single(struct dma_ops_domain *dma_dom,
|
|
dma_addr_t dma_addr,
|
|
size_t size,
|
|
int dir)
|
|
{
|
|
dma_addr_t i, start;
|
|
unsigned int pages;
|
|
|
|
pages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
|
|
dma_addr &= PAGE_MASK;
|
|
start = dma_addr;
|
|
|
|
for (i = 0; i < pages; ++i) {
|
|
iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE);
|
|
start += PAGE_SIZE;
|
|
}
|
|
|
|
if (amd_iommu_unmap_flush) {
|
|
domain_flush_tlb(&dma_dom->domain);
|
|
domain_flush_complete(&dma_dom->domain);
|
|
dma_ops_free_iova(dma_dom, dma_addr, pages);
|
|
} else {
|
|
pages = __roundup_pow_of_two(pages);
|
|
queue_iova(&dma_dom->iovad, dma_addr >> PAGE_SHIFT, pages, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The exported map_single function for dma_ops.
|
|
*/
|
|
static dma_addr_t map_page(struct device *dev, struct page *page,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
phys_addr_t paddr = page_to_phys(page) + offset;
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
u64 dma_mask;
|
|
|
|
domain = get_domain(dev);
|
|
if (PTR_ERR(domain) == -EINVAL)
|
|
return (dma_addr_t)paddr;
|
|
else if (IS_ERR(domain))
|
|
return AMD_IOMMU_MAPPING_ERROR;
|
|
|
|
dma_mask = *dev->dma_mask;
|
|
dma_dom = to_dma_ops_domain(domain);
|
|
|
|
return __map_single(dev, dma_dom, paddr, size, dir, dma_mask);
|
|
}
|
|
|
|
/*
|
|
* The exported unmap_single function for dma_ops.
|
|
*/
|
|
static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
|
|
domain = get_domain(dev);
|
|
if (IS_ERR(domain))
|
|
return;
|
|
|
|
dma_dom = to_dma_ops_domain(domain);
|
|
|
|
__unmap_single(dma_dom, dma_addr, size, dir);
|
|
}
|
|
|
|
static int sg_num_pages(struct device *dev,
|
|
struct scatterlist *sglist,
|
|
int nelems)
|
|
{
|
|
unsigned long mask, boundary_size;
|
|
struct scatterlist *s;
|
|
int i, npages = 0;
|
|
|
|
mask = dma_get_seg_boundary(dev);
|
|
boundary_size = mask + 1 ? ALIGN(mask + 1, PAGE_SIZE) >> PAGE_SHIFT :
|
|
1UL << (BITS_PER_LONG - PAGE_SHIFT);
|
|
|
|
for_each_sg(sglist, s, nelems, i) {
|
|
int p, n;
|
|
|
|
s->dma_address = npages << PAGE_SHIFT;
|
|
p = npages % boundary_size;
|
|
n = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE);
|
|
if (p + n > boundary_size)
|
|
npages += boundary_size - p;
|
|
npages += n;
|
|
}
|
|
|
|
return npages;
|
|
}
|
|
|
|
/*
|
|
* The exported map_sg function for dma_ops (handles scatter-gather
|
|
* lists).
|
|
*/
|
|
static int map_sg(struct device *dev, struct scatterlist *sglist,
|
|
int nelems, enum dma_data_direction direction,
|
|
unsigned long attrs)
|
|
{
|
|
int mapped_pages = 0, npages = 0, prot = 0, i;
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
struct scatterlist *s;
|
|
unsigned long address;
|
|
u64 dma_mask;
|
|
|
|
domain = get_domain(dev);
|
|
if (IS_ERR(domain))
|
|
return 0;
|
|
|
|
dma_dom = to_dma_ops_domain(domain);
|
|
dma_mask = *dev->dma_mask;
|
|
|
|
npages = sg_num_pages(dev, sglist, nelems);
|
|
|
|
address = dma_ops_alloc_iova(dev, dma_dom, npages, dma_mask);
|
|
if (address == AMD_IOMMU_MAPPING_ERROR)
|
|
goto out_err;
|
|
|
|
prot = dir2prot(direction);
|
|
|
|
/* Map all sg entries */
|
|
for_each_sg(sglist, s, nelems, i) {
|
|
int j, pages = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE);
|
|
|
|
for (j = 0; j < pages; ++j) {
|
|
unsigned long bus_addr, phys_addr;
|
|
int ret;
|
|
|
|
bus_addr = address + s->dma_address + (j << PAGE_SHIFT);
|
|
phys_addr = (sg_phys(s) & PAGE_MASK) + (j << PAGE_SHIFT);
|
|
ret = iommu_map_page(domain, bus_addr, phys_addr, PAGE_SIZE, prot, GFP_ATOMIC);
|
|
if (ret)
|
|
goto out_unmap;
|
|
|
|
mapped_pages += 1;
|
|
}
|
|
}
|
|
|
|
/* Everything is mapped - write the right values into s->dma_address */
|
|
for_each_sg(sglist, s, nelems, i) {
|
|
s->dma_address += address + s->offset;
|
|
s->dma_length = s->length;
|
|
}
|
|
|
|
return nelems;
|
|
|
|
out_unmap:
|
|
pr_err("%s: IOMMU mapping error in map_sg (io-pages: %d)\n",
|
|
dev_name(dev), npages);
|
|
|
|
for_each_sg(sglist, s, nelems, i) {
|
|
int j, pages = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE);
|
|
|
|
for (j = 0; j < pages; ++j) {
|
|
unsigned long bus_addr;
|
|
|
|
bus_addr = address + s->dma_address + (j << PAGE_SHIFT);
|
|
iommu_unmap_page(domain, bus_addr, PAGE_SIZE);
|
|
|
|
if (--mapped_pages)
|
|
goto out_free_iova;
|
|
}
|
|
}
|
|
|
|
out_free_iova:
|
|
free_iova_fast(&dma_dom->iovad, address, npages);
|
|
|
|
out_err:
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The exported map_sg function for dma_ops (handles scatter-gather
|
|
* lists).
|
|
*/
|
|
static void unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|
int nelems, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
unsigned long startaddr;
|
|
int npages = 2;
|
|
|
|
domain = get_domain(dev);
|
|
if (IS_ERR(domain))
|
|
return;
|
|
|
|
startaddr = sg_dma_address(sglist) & PAGE_MASK;
|
|
dma_dom = to_dma_ops_domain(domain);
|
|
npages = sg_num_pages(dev, sglist, nelems);
|
|
|
|
__unmap_single(dma_dom, startaddr, npages << PAGE_SHIFT, dir);
|
|
}
|
|
|
|
/*
|
|
* The exported alloc_coherent function for dma_ops.
|
|
*/
|
|
static void *alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_addr, gfp_t flag,
|
|
unsigned long attrs)
|
|
{
|
|
u64 dma_mask = dev->coherent_dma_mask;
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
struct page *page;
|
|
|
|
domain = get_domain(dev);
|
|
if (PTR_ERR(domain) == -EINVAL) {
|
|
page = alloc_pages(flag, get_order(size));
|
|
*dma_addr = page_to_phys(page);
|
|
return page_address(page);
|
|
} else if (IS_ERR(domain))
|
|
return NULL;
|
|
|
|
dma_dom = to_dma_ops_domain(domain);
|
|
size = PAGE_ALIGN(size);
|
|
dma_mask = dev->coherent_dma_mask;
|
|
flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
|
|
flag |= __GFP_ZERO;
|
|
|
|
page = alloc_pages(flag | __GFP_NOWARN, get_order(size));
|
|
if (!page) {
|
|
if (!gfpflags_allow_blocking(flag))
|
|
return NULL;
|
|
|
|
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
|
|
get_order(size), flag & __GFP_NOWARN);
|
|
if (!page)
|
|
return NULL;
|
|
}
|
|
|
|
if (!dma_mask)
|
|
dma_mask = *dev->dma_mask;
|
|
|
|
*dma_addr = __map_single(dev, dma_dom, page_to_phys(page),
|
|
size, DMA_BIDIRECTIONAL, dma_mask);
|
|
|
|
if (*dma_addr == AMD_IOMMU_MAPPING_ERROR)
|
|
goto out_free;
|
|
|
|
return page_address(page);
|
|
|
|
out_free:
|
|
|
|
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
|
|
__free_pages(page, get_order(size));
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* The exported free_coherent function for dma_ops.
|
|
*/
|
|
static void free_coherent(struct device *dev, size_t size,
|
|
void *virt_addr, dma_addr_t dma_addr,
|
|
unsigned long attrs)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
struct page *page;
|
|
|
|
page = virt_to_page(virt_addr);
|
|
size = PAGE_ALIGN(size);
|
|
|
|
domain = get_domain(dev);
|
|
if (IS_ERR(domain))
|
|
goto free_mem;
|
|
|
|
dma_dom = to_dma_ops_domain(domain);
|
|
|
|
__unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL);
|
|
|
|
free_mem:
|
|
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
|
|
__free_pages(page, get_order(size));
|
|
}
|
|
|
|
/*
|
|
* This function is called by the DMA layer to find out if we can handle a
|
|
* particular device. It is part of the dma_ops.
|
|
*/
|
|
static int amd_iommu_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
if (!dma_direct_supported(dev, mask))
|
|
return 0;
|
|
return check_device(dev);
|
|
}
|
|
|
|
static int amd_iommu_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
|
{
|
|
return dma_addr == AMD_IOMMU_MAPPING_ERROR;
|
|
}
|
|
|
|
static const struct dma_map_ops amd_iommu_dma_ops = {
|
|
.alloc = alloc_coherent,
|
|
.free = free_coherent,
|
|
.map_page = map_page,
|
|
.unmap_page = unmap_page,
|
|
.map_sg = map_sg,
|
|
.unmap_sg = unmap_sg,
|
|
.dma_supported = amd_iommu_dma_supported,
|
|
.mapping_error = amd_iommu_mapping_error,
|
|
};
|
|
|
|
static int init_reserved_iova_ranges(void)
|
|
{
|
|
struct pci_dev *pdev = NULL;
|
|
struct iova *val;
|
|
|
|
init_iova_domain(&reserved_iova_ranges, PAGE_SIZE, IOVA_START_PFN);
|
|
|
|
lockdep_set_class(&reserved_iova_ranges.iova_rbtree_lock,
|
|
&reserved_rbtree_key);
|
|
|
|
/* MSI memory range */
|
|
val = reserve_iova(&reserved_iova_ranges,
|
|
IOVA_PFN(MSI_RANGE_START), IOVA_PFN(MSI_RANGE_END));
|
|
if (!val) {
|
|
pr_err("Reserving MSI range failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* HT memory range */
|
|
val = reserve_iova(&reserved_iova_ranges,
|
|
IOVA_PFN(HT_RANGE_START), IOVA_PFN(HT_RANGE_END));
|
|
if (!val) {
|
|
pr_err("Reserving HT range failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Memory used for PCI resources
|
|
* FIXME: Check whether we can reserve the PCI-hole completly
|
|
*/
|
|
for_each_pci_dev(pdev) {
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_NUM_RESOURCES; ++i) {
|
|
struct resource *r = &pdev->resource[i];
|
|
|
|
if (!(r->flags & IORESOURCE_MEM))
|
|
continue;
|
|
|
|
val = reserve_iova(&reserved_iova_ranges,
|
|
IOVA_PFN(r->start),
|
|
IOVA_PFN(r->end));
|
|
if (!val) {
|
|
pr_err("Reserve pci-resource range failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init amd_iommu_init_api(void)
|
|
{
|
|
int ret, err = 0;
|
|
|
|
ret = iova_cache_get();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = init_reserved_iova_ranges();
|
|
if (ret)
|
|
return ret;
|
|
|
|
err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
|
|
if (err)
|
|
return err;
|
|
#ifdef CONFIG_ARM_AMBA
|
|
err = bus_set_iommu(&amba_bustype, &amd_iommu_ops);
|
|
if (err)
|
|
return err;
|
|
#endif
|
|
err = bus_set_iommu(&platform_bus_type, &amd_iommu_ops);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init amd_iommu_init_dma_ops(void)
|
|
{
|
|
swiotlb = (iommu_pass_through || sme_me_mask) ? 1 : 0;
|
|
iommu_detected = 1;
|
|
|
|
/*
|
|
* In case we don't initialize SWIOTLB (actually the common case
|
|
* when AMD IOMMU is enabled and SME is not active), make sure there
|
|
* are global dma_ops set as a fall-back for devices not handled by
|
|
* this driver (for example non-PCI devices). When SME is active,
|
|
* make sure that swiotlb variable remains set so the global dma_ops
|
|
* continue to be SWIOTLB.
|
|
*/
|
|
if (!swiotlb)
|
|
dma_ops = &dma_direct_ops;
|
|
|
|
if (amd_iommu_unmap_flush)
|
|
pr_info("AMD-Vi: IO/TLB flush on unmap enabled\n");
|
|
else
|
|
pr_info("AMD-Vi: Lazy IO/TLB flushing enabled\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* The following functions belong to the exported interface of AMD IOMMU
|
|
*
|
|
* This interface allows access to lower level functions of the IOMMU
|
|
* like protection domain handling and assignement of devices to domains
|
|
* which is not possible with the dma_ops interface.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
static void cleanup_domain(struct protection_domain *domain)
|
|
{
|
|
struct iommu_dev_data *entry;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
|
|
while (!list_empty(&domain->dev_list)) {
|
|
entry = list_first_entry(&domain->dev_list,
|
|
struct iommu_dev_data, list);
|
|
BUG_ON(!entry->domain);
|
|
__detach_device(entry);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
}
|
|
|
|
static void protection_domain_free(struct protection_domain *domain)
|
|
{
|
|
if (!domain)
|
|
return;
|
|
|
|
del_domain_from_list(domain);
|
|
|
|
if (domain->id)
|
|
domain_id_free(domain->id);
|
|
|
|
kfree(domain);
|
|
}
|
|
|
|
static int protection_domain_init(struct protection_domain *domain)
|
|
{
|
|
spin_lock_init(&domain->lock);
|
|
mutex_init(&domain->api_lock);
|
|
domain->id = domain_id_alloc();
|
|
if (!domain->id)
|
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(&domain->dev_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct protection_domain *protection_domain_alloc(void)
|
|
{
|
|
struct protection_domain *domain;
|
|
|
|
domain = kzalloc(sizeof(*domain), GFP_KERNEL);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
if (protection_domain_init(domain))
|
|
goto out_err;
|
|
|
|
add_domain_to_list(domain);
|
|
|
|
return domain;
|
|
|
|
out_err:
|
|
kfree(domain);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
|
|
{
|
|
struct protection_domain *pdomain;
|
|
struct dma_ops_domain *dma_domain;
|
|
|
|
switch (type) {
|
|
case IOMMU_DOMAIN_UNMANAGED:
|
|
pdomain = protection_domain_alloc();
|
|
if (!pdomain)
|
|
return NULL;
|
|
|
|
pdomain->mode = PAGE_MODE_3_LEVEL;
|
|
pdomain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
|
|
if (!pdomain->pt_root) {
|
|
protection_domain_free(pdomain);
|
|
return NULL;
|
|
}
|
|
|
|
pdomain->domain.geometry.aperture_start = 0;
|
|
pdomain->domain.geometry.aperture_end = ~0ULL;
|
|
pdomain->domain.geometry.force_aperture = true;
|
|
|
|
break;
|
|
case IOMMU_DOMAIN_DMA:
|
|
dma_domain = dma_ops_domain_alloc();
|
|
if (!dma_domain) {
|
|
pr_err("AMD-Vi: Failed to allocate\n");
|
|
return NULL;
|
|
}
|
|
pdomain = &dma_domain->domain;
|
|
break;
|
|
case IOMMU_DOMAIN_IDENTITY:
|
|
pdomain = protection_domain_alloc();
|
|
if (!pdomain)
|
|
return NULL;
|
|
|
|
pdomain->mode = PAGE_MODE_NONE;
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
return &pdomain->domain;
|
|
}
|
|
|
|
static void amd_iommu_domain_free(struct iommu_domain *dom)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
|
|
domain = to_pdomain(dom);
|
|
|
|
if (domain->dev_cnt > 0)
|
|
cleanup_domain(domain);
|
|
|
|
BUG_ON(domain->dev_cnt != 0);
|
|
|
|
if (!dom)
|
|
return;
|
|
|
|
switch (dom->type) {
|
|
case IOMMU_DOMAIN_DMA:
|
|
/* Now release the domain */
|
|
dma_dom = to_dma_ops_domain(domain);
|
|
dma_ops_domain_free(dma_dom);
|
|
break;
|
|
default:
|
|
if (domain->mode != PAGE_MODE_NONE)
|
|
free_pagetable(domain);
|
|
|
|
if (domain->flags & PD_IOMMUV2_MASK)
|
|
free_gcr3_table(domain);
|
|
|
|
protection_domain_free(domain);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void amd_iommu_detach_device(struct iommu_domain *dom,
|
|
struct device *dev)
|
|
{
|
|
struct iommu_dev_data *dev_data = dev->archdata.iommu;
|
|
struct amd_iommu *iommu;
|
|
int devid;
|
|
|
|
if (!check_device(dev))
|
|
return;
|
|
|
|
devid = get_device_id(dev);
|
|
if (devid < 0)
|
|
return;
|
|
|
|
if (dev_data->domain != NULL)
|
|
detach_device(dev);
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (!iommu)
|
|
return;
|
|
|
|
#ifdef CONFIG_IRQ_REMAP
|
|
if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
|
|
(dom->type == IOMMU_DOMAIN_UNMANAGED))
|
|
dev_data->use_vapic = 0;
|
|
#endif
|
|
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
static int amd_iommu_attach_device(struct iommu_domain *dom,
|
|
struct device *dev)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
struct iommu_dev_data *dev_data;
|
|
struct amd_iommu *iommu;
|
|
int ret;
|
|
|
|
if (!check_device(dev))
|
|
return -EINVAL;
|
|
|
|
dev_data = dev->archdata.iommu;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
if (!iommu)
|
|
return -EINVAL;
|
|
|
|
if (dev_data->domain)
|
|
detach_device(dev);
|
|
|
|
ret = attach_device(dev, domain);
|
|
|
|
#ifdef CONFIG_IRQ_REMAP
|
|
if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
|
|
if (dom->type == IOMMU_DOMAIN_UNMANAGED)
|
|
dev_data->use_vapic = 1;
|
|
else
|
|
dev_data->use_vapic = 0;
|
|
}
|
|
#endif
|
|
|
|
iommu_completion_wait(iommu);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
|
|
phys_addr_t paddr, size_t page_size, int iommu_prot)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
int prot = 0;
|
|
int ret;
|
|
|
|
if (domain->mode == PAGE_MODE_NONE)
|
|
return -EINVAL;
|
|
|
|
if (iommu_prot & IOMMU_READ)
|
|
prot |= IOMMU_PROT_IR;
|
|
if (iommu_prot & IOMMU_WRITE)
|
|
prot |= IOMMU_PROT_IW;
|
|
|
|
mutex_lock(&domain->api_lock);
|
|
ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL);
|
|
mutex_unlock(&domain->api_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
|
|
size_t page_size)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
size_t unmap_size;
|
|
|
|
if (domain->mode == PAGE_MODE_NONE)
|
|
return 0;
|
|
|
|
mutex_lock(&domain->api_lock);
|
|
unmap_size = iommu_unmap_page(domain, iova, page_size);
|
|
mutex_unlock(&domain->api_lock);
|
|
|
|
return unmap_size;
|
|
}
|
|
|
|
static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
|
|
dma_addr_t iova)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
unsigned long offset_mask, pte_pgsize;
|
|
u64 *pte, __pte;
|
|
|
|
if (domain->mode == PAGE_MODE_NONE)
|
|
return iova;
|
|
|
|
pte = fetch_pte(domain, iova, &pte_pgsize);
|
|
|
|
if (!pte || !IOMMU_PTE_PRESENT(*pte))
|
|
return 0;
|
|
|
|
offset_mask = pte_pgsize - 1;
|
|
__pte = __sme_clr(*pte & PM_ADDR_MASK);
|
|
|
|
return (__pte & ~offset_mask) | (iova & offset_mask);
|
|
}
|
|
|
|
static bool amd_iommu_capable(enum iommu_cap cap)
|
|
{
|
|
switch (cap) {
|
|
case IOMMU_CAP_CACHE_COHERENCY:
|
|
return true;
|
|
case IOMMU_CAP_INTR_REMAP:
|
|
return (irq_remapping_enabled == 1);
|
|
case IOMMU_CAP_NOEXEC:
|
|
return false;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void amd_iommu_get_resv_regions(struct device *dev,
|
|
struct list_head *head)
|
|
{
|
|
struct iommu_resv_region *region;
|
|
struct unity_map_entry *entry;
|
|
int devid;
|
|
|
|
devid = get_device_id(dev);
|
|
if (devid < 0)
|
|
return;
|
|
|
|
list_for_each_entry(entry, &amd_iommu_unity_map, list) {
|
|
size_t length;
|
|
int prot = 0;
|
|
|
|
if (devid < entry->devid_start || devid > entry->devid_end)
|
|
continue;
|
|
|
|
length = entry->address_end - entry->address_start;
|
|
if (entry->prot & IOMMU_PROT_IR)
|
|
prot |= IOMMU_READ;
|
|
if (entry->prot & IOMMU_PROT_IW)
|
|
prot |= IOMMU_WRITE;
|
|
|
|
region = iommu_alloc_resv_region(entry->address_start,
|
|
length, prot,
|
|
IOMMU_RESV_DIRECT);
|
|
if (!region) {
|
|
pr_err("Out of memory allocating dm-regions for %s\n",
|
|
dev_name(dev));
|
|
return;
|
|
}
|
|
list_add_tail(®ion->list, head);
|
|
}
|
|
|
|
region = iommu_alloc_resv_region(MSI_RANGE_START,
|
|
MSI_RANGE_END - MSI_RANGE_START + 1,
|
|
0, IOMMU_RESV_MSI);
|
|
if (!region)
|
|
return;
|
|
list_add_tail(®ion->list, head);
|
|
|
|
region = iommu_alloc_resv_region(HT_RANGE_START,
|
|
HT_RANGE_END - HT_RANGE_START + 1,
|
|
0, IOMMU_RESV_RESERVED);
|
|
if (!region)
|
|
return;
|
|
list_add_tail(®ion->list, head);
|
|
}
|
|
|
|
static void amd_iommu_put_resv_regions(struct device *dev,
|
|
struct list_head *head)
|
|
{
|
|
struct iommu_resv_region *entry, *next;
|
|
|
|
list_for_each_entry_safe(entry, next, head, list)
|
|
kfree(entry);
|
|
}
|
|
|
|
static void amd_iommu_apply_resv_region(struct device *dev,
|
|
struct iommu_domain *domain,
|
|
struct iommu_resv_region *region)
|
|
{
|
|
struct dma_ops_domain *dma_dom = to_dma_ops_domain(to_pdomain(domain));
|
|
unsigned long start, end;
|
|
|
|
start = IOVA_PFN(region->start);
|
|
end = IOVA_PFN(region->start + region->length - 1);
|
|
|
|
WARN_ON_ONCE(reserve_iova(&dma_dom->iovad, start, end) == NULL);
|
|
}
|
|
|
|
static bool amd_iommu_is_attach_deferred(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
struct iommu_dev_data *dev_data = dev->archdata.iommu;
|
|
return dev_data->defer_attach;
|
|
}
|
|
|
|
static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain)
|
|
{
|
|
struct protection_domain *dom = to_pdomain(domain);
|
|
|
|
domain_flush_tlb_pde(dom);
|
|
domain_flush_complete(dom);
|
|
}
|
|
|
|
static void amd_iommu_iotlb_range_add(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size)
|
|
{
|
|
}
|
|
|
|
const struct iommu_ops amd_iommu_ops = {
|
|
.capable = amd_iommu_capable,
|
|
.domain_alloc = amd_iommu_domain_alloc,
|
|
.domain_free = amd_iommu_domain_free,
|
|
.attach_dev = amd_iommu_attach_device,
|
|
.detach_dev = amd_iommu_detach_device,
|
|
.map = amd_iommu_map,
|
|
.unmap = amd_iommu_unmap,
|
|
.iova_to_phys = amd_iommu_iova_to_phys,
|
|
.add_device = amd_iommu_add_device,
|
|
.remove_device = amd_iommu_remove_device,
|
|
.device_group = amd_iommu_device_group,
|
|
.get_resv_regions = amd_iommu_get_resv_regions,
|
|
.put_resv_regions = amd_iommu_put_resv_regions,
|
|
.apply_resv_region = amd_iommu_apply_resv_region,
|
|
.is_attach_deferred = amd_iommu_is_attach_deferred,
|
|
.pgsize_bitmap = AMD_IOMMU_PGSIZES,
|
|
.flush_iotlb_all = amd_iommu_flush_iotlb_all,
|
|
.iotlb_range_add = amd_iommu_iotlb_range_add,
|
|
.iotlb_sync = amd_iommu_flush_iotlb_all,
|
|
};
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* The next functions do a basic initialization of IOMMU for pass through
|
|
* mode
|
|
*
|
|
* In passthrough mode the IOMMU is initialized and enabled but not used for
|
|
* DMA-API translation.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/* IOMMUv2 specific functions */
|
|
int amd_iommu_register_ppr_notifier(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_register(&ppr_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_register_ppr_notifier);
|
|
|
|
int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_unregister(&ppr_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
|
|
|
|
void amd_iommu_domain_direct_map(struct iommu_domain *dom)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
/* Update data structure */
|
|
domain->mode = PAGE_MODE_NONE;
|
|
domain->updated = true;
|
|
|
|
/* Make changes visible to IOMMUs */
|
|
update_domain(domain);
|
|
|
|
/* Page-table is not visible to IOMMU anymore, so free it */
|
|
free_pagetable(domain);
|
|
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_domain_direct_map);
|
|
|
|
int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
unsigned long flags;
|
|
int levels, ret;
|
|
|
|
if (pasids <= 0 || pasids > (PASID_MASK + 1))
|
|
return -EINVAL;
|
|
|
|
/* Number of GCR3 table levels required */
|
|
for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
|
|
levels += 1;
|
|
|
|
if (levels > amd_iommu_max_glx_val)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
/*
|
|
* Save us all sanity checks whether devices already in the
|
|
* domain support IOMMUv2. Just force that the domain has no
|
|
* devices attached when it is switched into IOMMUv2 mode.
|
|
*/
|
|
ret = -EBUSY;
|
|
if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK)
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
|
|
if (domain->gcr3_tbl == NULL)
|
|
goto out;
|
|
|
|
domain->glx = levels;
|
|
domain->flags |= PD_IOMMUV2_MASK;
|
|
domain->updated = true;
|
|
|
|
update_domain(domain);
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_domain_enable_v2);
|
|
|
|
static int __flush_pasid(struct protection_domain *domain, int pasid,
|
|
u64 address, bool size)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct iommu_cmd cmd;
|
|
int i, ret;
|
|
|
|
if (!(domain->flags & PD_IOMMUV2_MASK))
|
|
return -EINVAL;
|
|
|
|
build_inv_iommu_pasid(&cmd, domain->id, pasid, address, size);
|
|
|
|
/*
|
|
* IOMMU TLB needs to be flushed before Device TLB to
|
|
* prevent device TLB refill from IOMMU TLB
|
|
*/
|
|
for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
|
|
if (domain->dev_iommu[i] == 0)
|
|
continue;
|
|
|
|
ret = iommu_queue_command(amd_iommus[i], &cmd);
|
|
if (ret != 0)
|
|
goto out;
|
|
}
|
|
|
|
/* Wait until IOMMU TLB flushes are complete */
|
|
domain_flush_complete(domain);
|
|
|
|
/* Now flush device TLBs */
|
|
list_for_each_entry(dev_data, &domain->dev_list, list) {
|
|
struct amd_iommu *iommu;
|
|
int qdep;
|
|
|
|
/*
|
|
There might be non-IOMMUv2 capable devices in an IOMMUv2
|
|
* domain.
|
|
*/
|
|
if (!dev_data->ats.enabled)
|
|
continue;
|
|
|
|
qdep = dev_data->ats.qdep;
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
|
|
build_inv_iotlb_pasid(&cmd, dev_data->devid, pasid,
|
|
qdep, address, size);
|
|
|
|
ret = iommu_queue_command(iommu, &cmd);
|
|
if (ret != 0)
|
|
goto out;
|
|
}
|
|
|
|
/* Wait until all device TLBs are flushed */
|
|
domain_flush_complete(domain);
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __amd_iommu_flush_page(struct protection_domain *domain, int pasid,
|
|
u64 address)
|
|
{
|
|
return __flush_pasid(domain, pasid, address, false);
|
|
}
|
|
|
|
int amd_iommu_flush_page(struct iommu_domain *dom, int pasid,
|
|
u64 address)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
ret = __amd_iommu_flush_page(domain, pasid, address);
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_flush_page);
|
|
|
|
static int __amd_iommu_flush_tlb(struct protection_domain *domain, int pasid)
|
|
{
|
|
return __flush_pasid(domain, pasid, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
|
|
true);
|
|
}
|
|
|
|
int amd_iommu_flush_tlb(struct iommu_domain *dom, int pasid)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
ret = __amd_iommu_flush_tlb(domain, pasid);
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_flush_tlb);
|
|
|
|
static u64 *__get_gcr3_pte(u64 *root, int level, int pasid, bool alloc)
|
|
{
|
|
int index;
|
|
u64 *pte;
|
|
|
|
while (true) {
|
|
|
|
index = (pasid >> (9 * level)) & 0x1ff;
|
|
pte = &root[index];
|
|
|
|
if (level == 0)
|
|
break;
|
|
|
|
if (!(*pte & GCR3_VALID)) {
|
|
if (!alloc)
|
|
return NULL;
|
|
|
|
root = (void *)get_zeroed_page(GFP_ATOMIC);
|
|
if (root == NULL)
|
|
return NULL;
|
|
|
|
*pte = iommu_virt_to_phys(root) | GCR3_VALID;
|
|
}
|
|
|
|
root = iommu_phys_to_virt(*pte & PAGE_MASK);
|
|
|
|
level -= 1;
|
|
}
|
|
|
|
return pte;
|
|
}
|
|
|
|
static int __set_gcr3(struct protection_domain *domain, int pasid,
|
|
unsigned long cr3)
|
|
{
|
|
u64 *pte;
|
|
|
|
if (domain->mode != PAGE_MODE_NONE)
|
|
return -EINVAL;
|
|
|
|
pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true);
|
|
if (pte == NULL)
|
|
return -ENOMEM;
|
|
|
|
*pte = (cr3 & PAGE_MASK) | GCR3_VALID;
|
|
|
|
return __amd_iommu_flush_tlb(domain, pasid);
|
|
}
|
|
|
|
static int __clear_gcr3(struct protection_domain *domain, int pasid)
|
|
{
|
|
u64 *pte;
|
|
|
|
if (domain->mode != PAGE_MODE_NONE)
|
|
return -EINVAL;
|
|
|
|
pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false);
|
|
if (pte == NULL)
|
|
return 0;
|
|
|
|
*pte = 0;
|
|
|
|
return __amd_iommu_flush_tlb(domain, pasid);
|
|
}
|
|
|
|
int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, int pasid,
|
|
unsigned long cr3)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
ret = __set_gcr3(domain, pasid, cr3);
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_domain_set_gcr3);
|
|
|
|
int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid)
|
|
{
|
|
struct protection_domain *domain = to_pdomain(dom);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
ret = __clear_gcr3(domain, pasid);
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_domain_clear_gcr3);
|
|
|
|
int amd_iommu_complete_ppr(struct pci_dev *pdev, int pasid,
|
|
int status, int tag)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct amd_iommu *iommu;
|
|
struct iommu_cmd cmd;
|
|
|
|
dev_data = get_dev_data(&pdev->dev);
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
|
|
build_complete_ppr(&cmd, dev_data->devid, pasid, status,
|
|
tag, dev_data->pri_tlp);
|
|
|
|
return iommu_queue_command(iommu, &cmd);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_complete_ppr);
|
|
|
|
struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev)
|
|
{
|
|
struct protection_domain *pdomain;
|
|
|
|
pdomain = get_domain(&pdev->dev);
|
|
if (IS_ERR(pdomain))
|
|
return NULL;
|
|
|
|
/* Only return IOMMUv2 domains */
|
|
if (!(pdomain->flags & PD_IOMMUV2_MASK))
|
|
return NULL;
|
|
|
|
return &pdomain->domain;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_get_v2_domain);
|
|
|
|
void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
|
|
if (!amd_iommu_v2_supported())
|
|
return;
|
|
|
|
dev_data = get_dev_data(&pdev->dev);
|
|
dev_data->errata |= (1 << erratum);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_enable_device_erratum);
|
|
|
|
int amd_iommu_device_info(struct pci_dev *pdev,
|
|
struct amd_iommu_device_info *info)
|
|
{
|
|
int max_pasids;
|
|
int pos;
|
|
|
|
if (pdev == NULL || info == NULL)
|
|
return -EINVAL;
|
|
|
|
if (!amd_iommu_v2_supported())
|
|
return -EINVAL;
|
|
|
|
memset(info, 0, sizeof(*info));
|
|
|
|
if (!pci_ats_disabled()) {
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS);
|
|
if (pos)
|
|
info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP;
|
|
}
|
|
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
|
|
if (pos)
|
|
info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP;
|
|
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
|
|
if (pos) {
|
|
int features;
|
|
|
|
max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1));
|
|
max_pasids = min(max_pasids, (1 << 20));
|
|
|
|
info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
|
|
info->max_pasids = min(pci_max_pasids(pdev), max_pasids);
|
|
|
|
features = pci_pasid_features(pdev);
|
|
if (features & PCI_PASID_CAP_EXEC)
|
|
info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP;
|
|
if (features & PCI_PASID_CAP_PRIV)
|
|
info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_device_info);
|
|
|
|
#ifdef CONFIG_IRQ_REMAP
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* Interrupt Remapping Implementation
|
|
*
|
|
*****************************************************************************/
|
|
|
|
static struct irq_chip amd_ir_chip;
|
|
static DEFINE_SPINLOCK(iommu_table_lock);
|
|
|
|
static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
|
|
{
|
|
u64 dte;
|
|
|
|
dte = amd_iommu_dev_table[devid].data[2];
|
|
dte &= ~DTE_IRQ_PHYS_ADDR_MASK;
|
|
dte |= iommu_virt_to_phys(table->table);
|
|
dte |= DTE_IRQ_REMAP_INTCTL;
|
|
dte |= DTE_IRQ_TABLE_LEN;
|
|
dte |= DTE_IRQ_REMAP_ENABLE;
|
|
|
|
amd_iommu_dev_table[devid].data[2] = dte;
|
|
}
|
|
|
|
static struct irq_remap_table *get_irq_table(u16 devid)
|
|
{
|
|
struct irq_remap_table *table;
|
|
|
|
if (WARN_ONCE(!amd_iommu_rlookup_table[devid],
|
|
"%s: no iommu for devid %x\n", __func__, devid))
|
|
return NULL;
|
|
|
|
table = irq_lookup_table[devid];
|
|
if (WARN_ONCE(!table, "%s: no table for devid %x\n", __func__, devid))
|
|
return NULL;
|
|
|
|
return table;
|
|
}
|
|
|
|
static struct irq_remap_table *__alloc_irq_table(void)
|
|
{
|
|
struct irq_remap_table *table;
|
|
|
|
table = kzalloc(sizeof(*table), GFP_KERNEL);
|
|
if (!table)
|
|
return NULL;
|
|
|
|
table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_KERNEL);
|
|
if (!table->table) {
|
|
kfree(table);
|
|
return NULL;
|
|
}
|
|
raw_spin_lock_init(&table->lock);
|
|
|
|
if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
|
|
memset(table->table, 0,
|
|
MAX_IRQS_PER_TABLE * sizeof(u32));
|
|
else
|
|
memset(table->table, 0,
|
|
(MAX_IRQS_PER_TABLE * (sizeof(u64) * 2)));
|
|
return table;
|
|
}
|
|
|
|
static void set_remap_table_entry(struct amd_iommu *iommu, u16 devid,
|
|
struct irq_remap_table *table)
|
|
{
|
|
irq_lookup_table[devid] = table;
|
|
set_dte_irq_entry(devid, table);
|
|
iommu_flush_dte(iommu, devid);
|
|
}
|
|
|
|
static struct irq_remap_table *alloc_irq_table(u16 devid)
|
|
{
|
|
struct irq_remap_table *table = NULL;
|
|
struct irq_remap_table *new_table = NULL;
|
|
struct amd_iommu *iommu;
|
|
unsigned long flags;
|
|
u16 alias;
|
|
|
|
spin_lock_irqsave(&iommu_table_lock, flags);
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (!iommu)
|
|
goto out_unlock;
|
|
|
|
table = irq_lookup_table[devid];
|
|
if (table)
|
|
goto out_unlock;
|
|
|
|
alias = amd_iommu_alias_table[devid];
|
|
table = irq_lookup_table[alias];
|
|
if (table) {
|
|
set_remap_table_entry(iommu, devid, table);
|
|
goto out_wait;
|
|
}
|
|
spin_unlock_irqrestore(&iommu_table_lock, flags);
|
|
|
|
/* Nothing there yet, allocate new irq remapping table */
|
|
new_table = __alloc_irq_table();
|
|
if (!new_table)
|
|
return NULL;
|
|
|
|
spin_lock_irqsave(&iommu_table_lock, flags);
|
|
|
|
table = irq_lookup_table[devid];
|
|
if (table)
|
|
goto out_unlock;
|
|
|
|
table = irq_lookup_table[alias];
|
|
if (table) {
|
|
set_remap_table_entry(iommu, devid, table);
|
|
goto out_wait;
|
|
}
|
|
|
|
table = new_table;
|
|
new_table = NULL;
|
|
|
|
set_remap_table_entry(iommu, devid, table);
|
|
if (devid != alias)
|
|
set_remap_table_entry(iommu, alias, table);
|
|
|
|
out_wait:
|
|
iommu_completion_wait(iommu);
|
|
|
|
out_unlock:
|
|
spin_unlock_irqrestore(&iommu_table_lock, flags);
|
|
|
|
if (new_table) {
|
|
kmem_cache_free(amd_iommu_irq_cache, new_table->table);
|
|
kfree(new_table);
|
|
}
|
|
return table;
|
|
}
|
|
|
|
static int alloc_irq_index(u16 devid, int count, bool align)
|
|
{
|
|
struct irq_remap_table *table;
|
|
int index, c, alignment = 1;
|
|
unsigned long flags;
|
|
struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
|
|
|
|
if (!iommu)
|
|
return -ENODEV;
|
|
|
|
table = alloc_irq_table(devid);
|
|
if (!table)
|
|
return -ENODEV;
|
|
|
|
if (align)
|
|
alignment = roundup_pow_of_two(count);
|
|
|
|
raw_spin_lock_irqsave(&table->lock, flags);
|
|
|
|
/* Scan table for free entries */
|
|
for (index = ALIGN(table->min_index, alignment), c = 0;
|
|
index < MAX_IRQS_PER_TABLE;) {
|
|
if (!iommu->irte_ops->is_allocated(table, index)) {
|
|
c += 1;
|
|
} else {
|
|
c = 0;
|
|
index = ALIGN(index + 1, alignment);
|
|
continue;
|
|
}
|
|
|
|
if (c == count) {
|
|
for (; c != 0; --c)
|
|
iommu->irte_ops->set_allocated(table, index - c + 1);
|
|
|
|
index -= count - 1;
|
|
goto out;
|
|
}
|
|
|
|
index++;
|
|
}
|
|
|
|
index = -ENOSPC;
|
|
|
|
out:
|
|
raw_spin_unlock_irqrestore(&table->lock, flags);
|
|
|
|
return index;
|
|
}
|
|
|
|
static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte,
|
|
struct amd_ir_data *data)
|
|
{
|
|
struct irq_remap_table *table;
|
|
struct amd_iommu *iommu;
|
|
unsigned long flags;
|
|
struct irte_ga *entry;
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (iommu == NULL)
|
|
return -EINVAL;
|
|
|
|
table = get_irq_table(devid);
|
|
if (!table)
|
|
return -ENOMEM;
|
|
|
|
raw_spin_lock_irqsave(&table->lock, flags);
|
|
|
|
entry = (struct irte_ga *)table->table;
|
|
entry = &entry[index];
|
|
entry->lo.fields_remap.valid = 0;
|
|
entry->hi.val = irte->hi.val;
|
|
entry->lo.val = irte->lo.val;
|
|
entry->lo.fields_remap.valid = 1;
|
|
if (data)
|
|
data->ref = entry;
|
|
|
|
raw_spin_unlock_irqrestore(&table->lock, flags);
|
|
|
|
iommu_flush_irt(iommu, devid);
|
|
iommu_completion_wait(iommu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int modify_irte(u16 devid, int index, union irte *irte)
|
|
{
|
|
struct irq_remap_table *table;
|
|
struct amd_iommu *iommu;
|
|
unsigned long flags;
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (iommu == NULL)
|
|
return -EINVAL;
|
|
|
|
table = get_irq_table(devid);
|
|
if (!table)
|
|
return -ENOMEM;
|
|
|
|
raw_spin_lock_irqsave(&table->lock, flags);
|
|
table->table[index] = irte->val;
|
|
raw_spin_unlock_irqrestore(&table->lock, flags);
|
|
|
|
iommu_flush_irt(iommu, devid);
|
|
iommu_completion_wait(iommu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void free_irte(u16 devid, int index)
|
|
{
|
|
struct irq_remap_table *table;
|
|
struct amd_iommu *iommu;
|
|
unsigned long flags;
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (iommu == NULL)
|
|
return;
|
|
|
|
table = get_irq_table(devid);
|
|
if (!table)
|
|
return;
|
|
|
|
raw_spin_lock_irqsave(&table->lock, flags);
|
|
iommu->irte_ops->clear_allocated(table, index);
|
|
raw_spin_unlock_irqrestore(&table->lock, flags);
|
|
|
|
iommu_flush_irt(iommu, devid);
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
static void irte_prepare(void *entry,
|
|
u32 delivery_mode, u32 dest_mode,
|
|
u8 vector, u32 dest_apicid, int devid)
|
|
{
|
|
union irte *irte = (union irte *) entry;
|
|
|
|
irte->val = 0;
|
|
irte->fields.vector = vector;
|
|
irte->fields.int_type = delivery_mode;
|
|
irte->fields.destination = dest_apicid;
|
|
irte->fields.dm = dest_mode;
|
|
irte->fields.valid = 1;
|
|
}
|
|
|
|
static void irte_ga_prepare(void *entry,
|
|
u32 delivery_mode, u32 dest_mode,
|
|
u8 vector, u32 dest_apicid, int devid)
|
|
{
|
|
struct irte_ga *irte = (struct irte_ga *) entry;
|
|
|
|
irte->lo.val = 0;
|
|
irte->hi.val = 0;
|
|
irte->lo.fields_remap.int_type = delivery_mode;
|
|
irte->lo.fields_remap.dm = dest_mode;
|
|
irte->hi.fields.vector = vector;
|
|
irte->lo.fields_remap.destination = APICID_TO_IRTE_DEST_LO(dest_apicid);
|
|
irte->hi.fields.destination = APICID_TO_IRTE_DEST_HI(dest_apicid);
|
|
irte->lo.fields_remap.valid = 1;
|
|
}
|
|
|
|
static void irte_activate(void *entry, u16 devid, u16 index)
|
|
{
|
|
union irte *irte = (union irte *) entry;
|
|
|
|
irte->fields.valid = 1;
|
|
modify_irte(devid, index, irte);
|
|
}
|
|
|
|
static void irte_ga_activate(void *entry, u16 devid, u16 index)
|
|
{
|
|
struct irte_ga *irte = (struct irte_ga *) entry;
|
|
|
|
irte->lo.fields_remap.valid = 1;
|
|
modify_irte_ga(devid, index, irte, NULL);
|
|
}
|
|
|
|
static void irte_deactivate(void *entry, u16 devid, u16 index)
|
|
{
|
|
union irte *irte = (union irte *) entry;
|
|
|
|
irte->fields.valid = 0;
|
|
modify_irte(devid, index, irte);
|
|
}
|
|
|
|
static void irte_ga_deactivate(void *entry, u16 devid, u16 index)
|
|
{
|
|
struct irte_ga *irte = (struct irte_ga *) entry;
|
|
|
|
irte->lo.fields_remap.valid = 0;
|
|
modify_irte_ga(devid, index, irte, NULL);
|
|
}
|
|
|
|
static void irte_set_affinity(void *entry, u16 devid, u16 index,
|
|
u8 vector, u32 dest_apicid)
|
|
{
|
|
union irte *irte = (union irte *) entry;
|
|
|
|
irte->fields.vector = vector;
|
|
irte->fields.destination = dest_apicid;
|
|
modify_irte(devid, index, irte);
|
|
}
|
|
|
|
static void irte_ga_set_affinity(void *entry, u16 devid, u16 index,
|
|
u8 vector, u32 dest_apicid)
|
|
{
|
|
struct irte_ga *irte = (struct irte_ga *) entry;
|
|
|
|
if (!irte->lo.fields_remap.guest_mode) {
|
|
irte->hi.fields.vector = vector;
|
|
irte->lo.fields_remap.destination =
|
|
APICID_TO_IRTE_DEST_LO(dest_apicid);
|
|
irte->hi.fields.destination =
|
|
APICID_TO_IRTE_DEST_HI(dest_apicid);
|
|
modify_irte_ga(devid, index, irte, NULL);
|
|
}
|
|
}
|
|
|
|
#define IRTE_ALLOCATED (~1U)
|
|
static void irte_set_allocated(struct irq_remap_table *table, int index)
|
|
{
|
|
table->table[index] = IRTE_ALLOCATED;
|
|
}
|
|
|
|
static void irte_ga_set_allocated(struct irq_remap_table *table, int index)
|
|
{
|
|
struct irte_ga *ptr = (struct irte_ga *)table->table;
|
|
struct irte_ga *irte = &ptr[index];
|
|
|
|
memset(&irte->lo.val, 0, sizeof(u64));
|
|
memset(&irte->hi.val, 0, sizeof(u64));
|
|
irte->hi.fields.vector = 0xff;
|
|
}
|
|
|
|
static bool irte_is_allocated(struct irq_remap_table *table, int index)
|
|
{
|
|
union irte *ptr = (union irte *)table->table;
|
|
union irte *irte = &ptr[index];
|
|
|
|
return irte->val != 0;
|
|
}
|
|
|
|
static bool irte_ga_is_allocated(struct irq_remap_table *table, int index)
|
|
{
|
|
struct irte_ga *ptr = (struct irte_ga *)table->table;
|
|
struct irte_ga *irte = &ptr[index];
|
|
|
|
return irte->hi.fields.vector != 0;
|
|
}
|
|
|
|
static void irte_clear_allocated(struct irq_remap_table *table, int index)
|
|
{
|
|
table->table[index] = 0;
|
|
}
|
|
|
|
static void irte_ga_clear_allocated(struct irq_remap_table *table, int index)
|
|
{
|
|
struct irte_ga *ptr = (struct irte_ga *)table->table;
|
|
struct irte_ga *irte = &ptr[index];
|
|
|
|
memset(&irte->lo.val, 0, sizeof(u64));
|
|
memset(&irte->hi.val, 0, sizeof(u64));
|
|
}
|
|
|
|
static int get_devid(struct irq_alloc_info *info)
|
|
{
|
|
int devid = -1;
|
|
|
|
switch (info->type) {
|
|
case X86_IRQ_ALLOC_TYPE_IOAPIC:
|
|
devid = get_ioapic_devid(info->ioapic_id);
|
|
break;
|
|
case X86_IRQ_ALLOC_TYPE_HPET:
|
|
devid = get_hpet_devid(info->hpet_id);
|
|
break;
|
|
case X86_IRQ_ALLOC_TYPE_MSI:
|
|
case X86_IRQ_ALLOC_TYPE_MSIX:
|
|
devid = get_device_id(&info->msi_dev->dev);
|
|
break;
|
|
default:
|
|
BUG_ON(1);
|
|
break;
|
|
}
|
|
|
|
return devid;
|
|
}
|
|
|
|
static struct irq_domain *get_ir_irq_domain(struct irq_alloc_info *info)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
int devid;
|
|
|
|
if (!info)
|
|
return NULL;
|
|
|
|
devid = get_devid(info);
|
|
if (devid >= 0) {
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (iommu)
|
|
return iommu->ir_domain;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct irq_domain *get_irq_domain(struct irq_alloc_info *info)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
int devid;
|
|
|
|
if (!info)
|
|
return NULL;
|
|
|
|
switch (info->type) {
|
|
case X86_IRQ_ALLOC_TYPE_MSI:
|
|
case X86_IRQ_ALLOC_TYPE_MSIX:
|
|
devid = get_device_id(&info->msi_dev->dev);
|
|
if (devid < 0)
|
|
return NULL;
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (iommu)
|
|
return iommu->msi_domain;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct irq_remap_ops amd_iommu_irq_ops = {
|
|
.prepare = amd_iommu_prepare,
|
|
.enable = amd_iommu_enable,
|
|
.disable = amd_iommu_disable,
|
|
.reenable = amd_iommu_reenable,
|
|
.enable_faulting = amd_iommu_enable_faulting,
|
|
.get_ir_irq_domain = get_ir_irq_domain,
|
|
.get_irq_domain = get_irq_domain,
|
|
};
|
|
|
|
static void irq_remapping_prepare_irte(struct amd_ir_data *data,
|
|
struct irq_cfg *irq_cfg,
|
|
struct irq_alloc_info *info,
|
|
int devid, int index, int sub_handle)
|
|
{
|
|
struct irq_2_irte *irte_info = &data->irq_2_irte;
|
|
struct msi_msg *msg = &data->msi_entry;
|
|
struct IO_APIC_route_entry *entry;
|
|
struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
|
|
|
|
if (!iommu)
|
|
return;
|
|
|
|
data->irq_2_irte.devid = devid;
|
|
data->irq_2_irte.index = index + sub_handle;
|
|
iommu->irte_ops->prepare(data->entry, apic->irq_delivery_mode,
|
|
apic->irq_dest_mode, irq_cfg->vector,
|
|
irq_cfg->dest_apicid, devid);
|
|
|
|
switch (info->type) {
|
|
case X86_IRQ_ALLOC_TYPE_IOAPIC:
|
|
/* Setup IOAPIC entry */
|
|
entry = info->ioapic_entry;
|
|
info->ioapic_entry = NULL;
|
|
memset(entry, 0, sizeof(*entry));
|
|
entry->vector = index;
|
|
entry->mask = 0;
|
|
entry->trigger = info->ioapic_trigger;
|
|
entry->polarity = info->ioapic_polarity;
|
|
/* Mask level triggered irqs. */
|
|
if (info->ioapic_trigger)
|
|
entry->mask = 1;
|
|
break;
|
|
|
|
case X86_IRQ_ALLOC_TYPE_HPET:
|
|
case X86_IRQ_ALLOC_TYPE_MSI:
|
|
case X86_IRQ_ALLOC_TYPE_MSIX:
|
|
msg->address_hi = MSI_ADDR_BASE_HI;
|
|
msg->address_lo = MSI_ADDR_BASE_LO;
|
|
msg->data = irte_info->index;
|
|
break;
|
|
|
|
default:
|
|
BUG_ON(1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
struct amd_irte_ops irte_32_ops = {
|
|
.prepare = irte_prepare,
|
|
.activate = irte_activate,
|
|
.deactivate = irte_deactivate,
|
|
.set_affinity = irte_set_affinity,
|
|
.set_allocated = irte_set_allocated,
|
|
.is_allocated = irte_is_allocated,
|
|
.clear_allocated = irte_clear_allocated,
|
|
};
|
|
|
|
struct amd_irte_ops irte_128_ops = {
|
|
.prepare = irte_ga_prepare,
|
|
.activate = irte_ga_activate,
|
|
.deactivate = irte_ga_deactivate,
|
|
.set_affinity = irte_ga_set_affinity,
|
|
.set_allocated = irte_ga_set_allocated,
|
|
.is_allocated = irte_ga_is_allocated,
|
|
.clear_allocated = irte_ga_clear_allocated,
|
|
};
|
|
|
|
static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs, void *arg)
|
|
{
|
|
struct irq_alloc_info *info = arg;
|
|
struct irq_data *irq_data;
|
|
struct amd_ir_data *data = NULL;
|
|
struct irq_cfg *cfg;
|
|
int i, ret, devid;
|
|
int index;
|
|
|
|
if (!info)
|
|
return -EINVAL;
|
|
if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_MSI &&
|
|
info->type != X86_IRQ_ALLOC_TYPE_MSIX)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* With IRQ remapping enabled, don't need contiguous CPU vectors
|
|
* to support multiple MSI interrupts.
|
|
*/
|
|
if (info->type == X86_IRQ_ALLOC_TYPE_MSI)
|
|
info->flags &= ~X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;
|
|
|
|
devid = get_devid(info);
|
|
if (devid < 0)
|
|
return -EINVAL;
|
|
|
|
ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
|
|
struct irq_remap_table *table;
|
|
struct amd_iommu *iommu;
|
|
|
|
table = alloc_irq_table(devid);
|
|
if (table) {
|
|
if (!table->min_index) {
|
|
/*
|
|
* Keep the first 32 indexes free for IOAPIC
|
|
* interrupts.
|
|
*/
|
|
table->min_index = 32;
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
for (i = 0; i < 32; ++i)
|
|
iommu->irte_ops->set_allocated(table, i);
|
|
}
|
|
WARN_ON(table->min_index != 32);
|
|
index = info->ioapic_pin;
|
|
} else {
|
|
index = -ENOMEM;
|
|
}
|
|
} else {
|
|
bool align = (info->type == X86_IRQ_ALLOC_TYPE_MSI);
|
|
|
|
index = alloc_irq_index(devid, nr_irqs, align);
|
|
}
|
|
if (index < 0) {
|
|
pr_warn("Failed to allocate IRTE\n");
|
|
ret = index;
|
|
goto out_free_parent;
|
|
}
|
|
|
|
for (i = 0; i < nr_irqs; i++) {
|
|
irq_data = irq_domain_get_irq_data(domain, virq + i);
|
|
cfg = irqd_cfg(irq_data);
|
|
if (!irq_data || !cfg) {
|
|
ret = -EINVAL;
|
|
goto out_free_data;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
goto out_free_data;
|
|
|
|
if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
|
|
data->entry = kzalloc(sizeof(union irte), GFP_KERNEL);
|
|
else
|
|
data->entry = kzalloc(sizeof(struct irte_ga),
|
|
GFP_KERNEL);
|
|
if (!data->entry) {
|
|
kfree(data);
|
|
goto out_free_data;
|
|
}
|
|
|
|
irq_data->hwirq = (devid << 16) + i;
|
|
irq_data->chip_data = data;
|
|
irq_data->chip = &amd_ir_chip;
|
|
irq_remapping_prepare_irte(data, cfg, info, devid, index, i);
|
|
irq_set_status_flags(virq + i, IRQ_MOVE_PCNTXT);
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_data:
|
|
for (i--; i >= 0; i--) {
|
|
irq_data = irq_domain_get_irq_data(domain, virq + i);
|
|
if (irq_data)
|
|
kfree(irq_data->chip_data);
|
|
}
|
|
for (i = 0; i < nr_irqs; i++)
|
|
free_irte(devid, index + i);
|
|
out_free_parent:
|
|
irq_domain_free_irqs_common(domain, virq, nr_irqs);
|
|
return ret;
|
|
}
|
|
|
|
static void irq_remapping_free(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs)
|
|
{
|
|
struct irq_2_irte *irte_info;
|
|
struct irq_data *irq_data;
|
|
struct amd_ir_data *data;
|
|
int i;
|
|
|
|
for (i = 0; i < nr_irqs; i++) {
|
|
irq_data = irq_domain_get_irq_data(domain, virq + i);
|
|
if (irq_data && irq_data->chip_data) {
|
|
data = irq_data->chip_data;
|
|
irte_info = &data->irq_2_irte;
|
|
free_irte(irte_info->devid, irte_info->index);
|
|
kfree(data->entry);
|
|
kfree(data);
|
|
}
|
|
}
|
|
irq_domain_free_irqs_common(domain, virq, nr_irqs);
|
|
}
|
|
|
|
static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu,
|
|
struct amd_ir_data *ir_data,
|
|
struct irq_2_irte *irte_info,
|
|
struct irq_cfg *cfg);
|
|
|
|
static int irq_remapping_activate(struct irq_domain *domain,
|
|
struct irq_data *irq_data, bool reserve)
|
|
{
|
|
struct amd_ir_data *data = irq_data->chip_data;
|
|
struct irq_2_irte *irte_info = &data->irq_2_irte;
|
|
struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid];
|
|
struct irq_cfg *cfg = irqd_cfg(irq_data);
|
|
|
|
if (!iommu)
|
|
return 0;
|
|
|
|
iommu->irte_ops->activate(data->entry, irte_info->devid,
|
|
irte_info->index);
|
|
amd_ir_update_irte(irq_data, iommu, data, irte_info, cfg);
|
|
return 0;
|
|
}
|
|
|
|
static void irq_remapping_deactivate(struct irq_domain *domain,
|
|
struct irq_data *irq_data)
|
|
{
|
|
struct amd_ir_data *data = irq_data->chip_data;
|
|
struct irq_2_irte *irte_info = &data->irq_2_irte;
|
|
struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid];
|
|
|
|
if (iommu)
|
|
iommu->irte_ops->deactivate(data->entry, irte_info->devid,
|
|
irte_info->index);
|
|
}
|
|
|
|
static const struct irq_domain_ops amd_ir_domain_ops = {
|
|
.alloc = irq_remapping_alloc,
|
|
.free = irq_remapping_free,
|
|
.activate = irq_remapping_activate,
|
|
.deactivate = irq_remapping_deactivate,
|
|
};
|
|
|
|
static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
struct amd_iommu_pi_data *pi_data = vcpu_info;
|
|
struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
|
|
struct amd_ir_data *ir_data = data->chip_data;
|
|
struct irte_ga *irte = (struct irte_ga *) ir_data->entry;
|
|
struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
|
|
struct iommu_dev_data *dev_data = search_dev_data(irte_info->devid);
|
|
|
|
/* Note:
|
|
* This device has never been set up for guest mode.
|
|
* we should not modify the IRTE
|
|
*/
|
|
if (!dev_data || !dev_data->use_vapic)
|
|
return 0;
|
|
|
|
pi_data->ir_data = ir_data;
|
|
|
|
/* Note:
|
|
* SVM tries to set up for VAPIC mode, but we are in
|
|
* legacy mode. So, we force legacy mode instead.
|
|
*/
|
|
if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
|
|
pr_debug("AMD-Vi: %s: Fall back to using intr legacy remap\n",
|
|
__func__);
|
|
pi_data->is_guest_mode = false;
|
|
}
|
|
|
|
iommu = amd_iommu_rlookup_table[irte_info->devid];
|
|
if (iommu == NULL)
|
|
return -EINVAL;
|
|
|
|
pi_data->prev_ga_tag = ir_data->cached_ga_tag;
|
|
if (pi_data->is_guest_mode) {
|
|
/* Setting */
|
|
irte->hi.fields.ga_root_ptr = (pi_data->base >> 12);
|
|
irte->hi.fields.vector = vcpu_pi_info->vector;
|
|
irte->lo.fields_vapic.ga_log_intr = 1;
|
|
irte->lo.fields_vapic.guest_mode = 1;
|
|
irte->lo.fields_vapic.ga_tag = pi_data->ga_tag;
|
|
|
|
ir_data->cached_ga_tag = pi_data->ga_tag;
|
|
} else {
|
|
/* Un-Setting */
|
|
struct irq_cfg *cfg = irqd_cfg(data);
|
|
|
|
irte->hi.val = 0;
|
|
irte->lo.val = 0;
|
|
irte->hi.fields.vector = cfg->vector;
|
|
irte->lo.fields_remap.guest_mode = 0;
|
|
irte->lo.fields_remap.destination =
|
|
APICID_TO_IRTE_DEST_LO(cfg->dest_apicid);
|
|
irte->hi.fields.destination =
|
|
APICID_TO_IRTE_DEST_HI(cfg->dest_apicid);
|
|
irte->lo.fields_remap.int_type = apic->irq_delivery_mode;
|
|
irte->lo.fields_remap.dm = apic->irq_dest_mode;
|
|
|
|
/*
|
|
* This communicates the ga_tag back to the caller
|
|
* so that it can do all the necessary clean up.
|
|
*/
|
|
ir_data->cached_ga_tag = 0;
|
|
}
|
|
|
|
return modify_irte_ga(irte_info->devid, irte_info->index, irte, ir_data);
|
|
}
|
|
|
|
|
|
static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu,
|
|
struct amd_ir_data *ir_data,
|
|
struct irq_2_irte *irte_info,
|
|
struct irq_cfg *cfg)
|
|
{
|
|
|
|
/*
|
|
* Atomically updates the IRTE with the new destination, vector
|
|
* and flushes the interrupt entry cache.
|
|
*/
|
|
iommu->irte_ops->set_affinity(ir_data->entry, irte_info->devid,
|
|
irte_info->index, cfg->vector,
|
|
cfg->dest_apicid);
|
|
}
|
|
|
|
static int amd_ir_set_affinity(struct irq_data *data,
|
|
const struct cpumask *mask, bool force)
|
|
{
|
|
struct amd_ir_data *ir_data = data->chip_data;
|
|
struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
|
|
struct irq_cfg *cfg = irqd_cfg(data);
|
|
struct irq_data *parent = data->parent_data;
|
|
struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid];
|
|
int ret;
|
|
|
|
if (!iommu)
|
|
return -ENODEV;
|
|
|
|
ret = parent->chip->irq_set_affinity(parent, mask, force);
|
|
if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE)
|
|
return ret;
|
|
|
|
amd_ir_update_irte(data, iommu, ir_data, irte_info, cfg);
|
|
/*
|
|
* After this point, all the interrupts will start arriving
|
|
* at the new destination. So, time to cleanup the previous
|
|
* vector allocation.
|
|
*/
|
|
send_cleanup_vector(cfg);
|
|
|
|
return IRQ_SET_MASK_OK_DONE;
|
|
}
|
|
|
|
static void ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg)
|
|
{
|
|
struct amd_ir_data *ir_data = irq_data->chip_data;
|
|
|
|
*msg = ir_data->msi_entry;
|
|
}
|
|
|
|
static struct irq_chip amd_ir_chip = {
|
|
.name = "AMD-IR",
|
|
.irq_ack = apic_ack_irq,
|
|
.irq_set_affinity = amd_ir_set_affinity,
|
|
.irq_set_vcpu_affinity = amd_ir_set_vcpu_affinity,
|
|
.irq_compose_msi_msg = ir_compose_msi_msg,
|
|
};
|
|
|
|
int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
|
|
{
|
|
struct fwnode_handle *fn;
|
|
|
|
fn = irq_domain_alloc_named_id_fwnode("AMD-IR", iommu->index);
|
|
if (!fn)
|
|
return -ENOMEM;
|
|
iommu->ir_domain = irq_domain_create_tree(fn, &amd_ir_domain_ops, iommu);
|
|
irq_domain_free_fwnode(fn);
|
|
if (!iommu->ir_domain)
|
|
return -ENOMEM;
|
|
|
|
iommu->ir_domain->parent = arch_get_ir_parent_domain();
|
|
iommu->msi_domain = arch_create_remap_msi_irq_domain(iommu->ir_domain,
|
|
"AMD-IR-MSI",
|
|
iommu->index);
|
|
return 0;
|
|
}
|
|
|
|
int amd_iommu_update_ga(int cpu, bool is_run, void *data)
|
|
{
|
|
unsigned long flags;
|
|
struct amd_iommu *iommu;
|
|
struct irq_remap_table *table;
|
|
struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
|
|
int devid = ir_data->irq_2_irte.devid;
|
|
struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
|
|
struct irte_ga *ref = (struct irte_ga *) ir_data->ref;
|
|
|
|
if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
|
|
!ref || !entry || !entry->lo.fields_vapic.guest_mode)
|
|
return 0;
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (!iommu)
|
|
return -ENODEV;
|
|
|
|
table = get_irq_table(devid);
|
|
if (!table)
|
|
return -ENODEV;
|
|
|
|
raw_spin_lock_irqsave(&table->lock, flags);
|
|
|
|
if (ref->lo.fields_vapic.guest_mode) {
|
|
if (cpu >= 0) {
|
|
ref->lo.fields_vapic.destination =
|
|
APICID_TO_IRTE_DEST_LO(cpu);
|
|
ref->hi.fields.destination =
|
|
APICID_TO_IRTE_DEST_HI(cpu);
|
|
}
|
|
ref->lo.fields_vapic.is_run = is_run;
|
|
barrier();
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&table->lock, flags);
|
|
|
|
iommu_flush_irt(iommu, devid);
|
|
iommu_completion_wait(iommu);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_update_ga);
|
|
#endif
|