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linux/drivers/fpga/dfl.h
Martin Hundebøll 1604986c3e fpga: dfl: expose feature revision from struct dfl_device 
DFL device drivers have a common need for checking feature revision
information from the DFL header, as well as other common DFL information
like the already exposed feature id and type.

This patch exposes the feature revision information directly via the DFL
device data structure.

Since the DFL core code has already read the DFL header, this this patch
saves additional mmio reads from DFL device drivers too.

Acked-by: Wu Hao <hao.wu@intel.com>
Acked-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Martin Hundebøll <mhu@silicom.dk>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
2021-07-29 12:54:10 -07:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver Header File for FPGA Device Feature List (DFL) Support
*
* Copyright (C) 2017-2018 Intel Corporation, Inc.
*
* Authors:
* Kang Luwei <luwei.kang@intel.com>
* Zhang Yi <yi.z.zhang@intel.com>
* Wu Hao <hao.wu@intel.com>
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
*/
#ifndef __FPGA_DFL_H
#define __FPGA_DFL_H
#include <linux/bitfield.h>
#include <linux/cdev.h>
#include <linux/delay.h>
#include <linux/eventfd.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/fpga/fpga-region.h>
/* maximum supported number of ports */
#define MAX_DFL_FPGA_PORT_NUM 4
/* plus one for fme device */
#define MAX_DFL_FEATURE_DEV_NUM (MAX_DFL_FPGA_PORT_NUM + 1)
/* Reserved 0xfe for Header Group Register and 0xff for AFU */
#define FEATURE_ID_FIU_HEADER 0xfe
#define FEATURE_ID_AFU 0xff
#define FME_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
#define FME_FEATURE_ID_THERMAL_MGMT 0x1
#define FME_FEATURE_ID_POWER_MGMT 0x2
#define FME_FEATURE_ID_GLOBAL_IPERF 0x3
#define FME_FEATURE_ID_GLOBAL_ERR 0x4
#define FME_FEATURE_ID_PR_MGMT 0x5
#define FME_FEATURE_ID_HSSI 0x6
#define FME_FEATURE_ID_GLOBAL_DPERF 0x7
#define PORT_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
#define PORT_FEATURE_ID_AFU FEATURE_ID_AFU
#define PORT_FEATURE_ID_ERROR 0x10
#define PORT_FEATURE_ID_UMSG 0x11
#define PORT_FEATURE_ID_UINT 0x12
#define PORT_FEATURE_ID_STP 0x13
/*
* Device Feature Header Register Set
*
* For FIUs, they all have DFH + GUID + NEXT_AFU as common header registers.
* For AFUs, they have DFH + GUID as common header registers.
* For private features, they only have DFH register as common header.
*/
#define DFH 0x0
#define GUID_L 0x8
#define GUID_H 0x10
#define NEXT_AFU 0x18
#define DFH_SIZE 0x8
/* Device Feature Header Register Bitfield */
#define DFH_ID GENMASK_ULL(11, 0) /* Feature ID */
#define DFH_ID_FIU_FME 0
#define DFH_ID_FIU_PORT 1
#define DFH_REVISION GENMASK_ULL(15, 12) /* Feature revision */
#define DFH_NEXT_HDR_OFST GENMASK_ULL(39, 16) /* Offset to next DFH */
#define DFH_EOL BIT_ULL(40) /* End of list */
#define DFH_TYPE GENMASK_ULL(63, 60) /* Feature type */
#define DFH_TYPE_AFU 1
#define DFH_TYPE_PRIVATE 3
#define DFH_TYPE_FIU 4
/* Next AFU Register Bitfield */
#define NEXT_AFU_NEXT_DFH_OFST GENMASK_ULL(23, 0) /* Offset to next AFU */
/* FME Header Register Set */
#define FME_HDR_DFH DFH
#define FME_HDR_GUID_L GUID_L
#define FME_HDR_GUID_H GUID_H
#define FME_HDR_NEXT_AFU NEXT_AFU
#define FME_HDR_CAP 0x30
#define FME_HDR_PORT_OFST(n) (0x38 + ((n) * 0x8))
#define FME_HDR_BITSTREAM_ID 0x60
#define FME_HDR_BITSTREAM_MD 0x68
/* FME Fab Capability Register Bitfield */
#define FME_CAP_FABRIC_VERID GENMASK_ULL(7, 0) /* Fabric version ID */
#define FME_CAP_SOCKET_ID BIT_ULL(8) /* Socket ID */
#define FME_CAP_PCIE0_LINK_AVL BIT_ULL(12) /* PCIE0 Link */
#define FME_CAP_PCIE1_LINK_AVL BIT_ULL(13) /* PCIE1 Link */
#define FME_CAP_COHR_LINK_AVL BIT_ULL(14) /* Coherent Link */
#define FME_CAP_IOMMU_AVL BIT_ULL(16) /* IOMMU available */
#define FME_CAP_NUM_PORTS GENMASK_ULL(19, 17) /* Number of ports */
#define FME_CAP_ADDR_WIDTH GENMASK_ULL(29, 24) /* Address bus width */
#define FME_CAP_CACHE_SIZE GENMASK_ULL(43, 32) /* cache size in KB */
#define FME_CAP_CACHE_ASSOC GENMASK_ULL(47, 44) /* Associativity */
/* FME Port Offset Register Bitfield */
/* Offset to port device feature header */
#define FME_PORT_OFST_DFH_OFST GENMASK_ULL(23, 0)
/* PCI Bar ID for this port */
#define FME_PORT_OFST_BAR_ID GENMASK_ULL(34, 32)
/* AFU MMIO access permission. 1 - VF, 0 - PF. */
#define FME_PORT_OFST_ACC_CTRL BIT_ULL(55)
#define FME_PORT_OFST_ACC_PF 0
#define FME_PORT_OFST_ACC_VF 1
#define FME_PORT_OFST_IMP BIT_ULL(60)
/* FME Error Capability Register */
#define FME_ERROR_CAP 0x70
/* FME Error Capability Register Bitfield */
#define FME_ERROR_CAP_SUPP_INT BIT_ULL(0) /* Interrupt Support */
#define FME_ERROR_CAP_INT_VECT GENMASK_ULL(12, 1) /* Interrupt vector */
/* PORT Header Register Set */
#define PORT_HDR_DFH DFH
#define PORT_HDR_GUID_L GUID_L
#define PORT_HDR_GUID_H GUID_H
#define PORT_HDR_NEXT_AFU NEXT_AFU
#define PORT_HDR_CAP 0x30
#define PORT_HDR_CTRL 0x38
#define PORT_HDR_STS 0x40
#define PORT_HDR_USRCLK_CMD0 0x50
#define PORT_HDR_USRCLK_CMD1 0x58
#define PORT_HDR_USRCLK_STS0 0x60
#define PORT_HDR_USRCLK_STS1 0x68
/* Port Capability Register Bitfield */
#define PORT_CAP_PORT_NUM GENMASK_ULL(1, 0) /* ID of this port */
#define PORT_CAP_MMIO_SIZE GENMASK_ULL(23, 8) /* MMIO size in KB */
#define PORT_CAP_SUPP_INT_NUM GENMASK_ULL(35, 32) /* Interrupts num */
/* Port Control Register Bitfield */
#define PORT_CTRL_SFTRST BIT_ULL(0) /* Port soft reset */
/* Latency tolerance reporting. '1' >= 40us, '0' < 40us.*/
#define PORT_CTRL_LATENCY BIT_ULL(2)
#define PORT_CTRL_SFTRST_ACK BIT_ULL(4) /* HW ack for reset */
/* Port Status Register Bitfield */
#define PORT_STS_AP2_EVT BIT_ULL(13) /* AP2 event detected */
#define PORT_STS_AP1_EVT BIT_ULL(12) /* AP1 event detected */
#define PORT_STS_PWR_STATE GENMASK_ULL(11, 8) /* AFU power states */
#define PORT_STS_PWR_STATE_NORM 0
#define PORT_STS_PWR_STATE_AP1 1 /* 50% throttling */
#define PORT_STS_PWR_STATE_AP2 2 /* 90% throttling */
#define PORT_STS_PWR_STATE_AP6 6 /* 100% throttling */
/* Port Error Capability Register */
#define PORT_ERROR_CAP 0x38
/* Port Error Capability Register Bitfield */
#define PORT_ERROR_CAP_SUPP_INT BIT_ULL(0) /* Interrupt Support */
#define PORT_ERROR_CAP_INT_VECT GENMASK_ULL(12, 1) /* Interrupt vector */
/* Port Uint Capability Register */
#define PORT_UINT_CAP 0x8
/* Port Uint Capability Register Bitfield */
#define PORT_UINT_CAP_INT_NUM GENMASK_ULL(11, 0) /* Interrupts num */
#define PORT_UINT_CAP_FST_VECT GENMASK_ULL(23, 12) /* First Vector */
/**
* struct dfl_fpga_port_ops - port ops
*
* @name: name of this port ops, to match with port platform device.
* @owner: pointer to the module which owns this port ops.
* @node: node to link port ops to global list.
* @get_id: get port id from hardware.
* @enable_set: enable/disable the port.
*/
struct dfl_fpga_port_ops {
const char *name;
struct module *owner;
struct list_head node;
int (*get_id)(struct platform_device *pdev);
int (*enable_set)(struct platform_device *pdev, bool enable);
};
void dfl_fpga_port_ops_add(struct dfl_fpga_port_ops *ops);
void dfl_fpga_port_ops_del(struct dfl_fpga_port_ops *ops);
struct dfl_fpga_port_ops *dfl_fpga_port_ops_get(struct platform_device *pdev);
void dfl_fpga_port_ops_put(struct dfl_fpga_port_ops *ops);
int dfl_fpga_check_port_id(struct platform_device *pdev, void *pport_id);
/**
* struct dfl_feature_id - dfl private feature id
*
* @id: unique dfl private feature id.
*/
struct dfl_feature_id {
u16 id;
};
/**
* struct dfl_feature_driver - dfl private feature driver
*
* @id_table: id_table for dfl private features supported by this driver.
* @ops: ops of this dfl private feature driver.
*/
struct dfl_feature_driver {
const struct dfl_feature_id *id_table;
const struct dfl_feature_ops *ops;
};
/**
* struct dfl_feature_irq_ctx - dfl private feature interrupt context
*
* @irq: Linux IRQ number of this interrupt.
* @trigger: eventfd context to signal when interrupt happens.
* @name: irq name needed when requesting irq.
*/
struct dfl_feature_irq_ctx {
int irq;
struct eventfd_ctx *trigger;
char *name;
};
/**
* struct dfl_feature - sub feature of the feature devices
*
* @dev: ptr to pdev of the feature device which has the sub feature.
* @id: sub feature id.
* @resource_index: each sub feature has one mmio resource for its registers.
* this index is used to find its mmio resource from the
* feature dev (platform device)'s resources.
* @ioaddr: mapped mmio resource address.
* @irq_ctx: interrupt context list.
* @nr_irqs: number of interrupt contexts.
* @ops: ops of this sub feature.
* @ddev: ptr to the dfl device of this sub feature.
* @priv: priv data of this feature.
*/
struct dfl_feature {
struct platform_device *dev;
u16 id;
u8 revision;
int resource_index;
void __iomem *ioaddr;
struct dfl_feature_irq_ctx *irq_ctx;
unsigned int nr_irqs;
const struct dfl_feature_ops *ops;
struct dfl_device *ddev;
void *priv;
};
#define FEATURE_DEV_ID_UNUSED (-1)
/**
* struct dfl_feature_platform_data - platform data for feature devices
*
* @node: node to link feature devs to container device's port_dev_list.
* @lock: mutex to protect platform data.
* @cdev: cdev of feature dev.
* @dev: ptr to platform device linked with this platform data.
* @dfl_cdev: ptr to container device.
* @id: id used for this feature device.
* @disable_count: count for port disable.
* @excl_open: set on feature device exclusive open.
* @open_count: count for feature device open.
* @num: number for sub features.
* @private: ptr to feature dev private data.
* @features: sub features of this feature dev.
*/
struct dfl_feature_platform_data {
struct list_head node;
struct mutex lock;
struct cdev cdev;
struct platform_device *dev;
struct dfl_fpga_cdev *dfl_cdev;
int id;
unsigned int disable_count;
bool excl_open;
int open_count;
void *private;
int num;
struct dfl_feature features[];
};
static inline
int dfl_feature_dev_use_begin(struct dfl_feature_platform_data *pdata,
bool excl)
{
if (pdata->excl_open)
return -EBUSY;
if (excl) {
if (pdata->open_count)
return -EBUSY;
pdata->excl_open = true;
}
pdata->open_count++;
return 0;
}
static inline
void dfl_feature_dev_use_end(struct dfl_feature_platform_data *pdata)
{
pdata->excl_open = false;
if (WARN_ON(pdata->open_count <= 0))
return;
pdata->open_count--;
}
static inline
int dfl_feature_dev_use_count(struct dfl_feature_platform_data *pdata)
{
return pdata->open_count;
}
static inline
void dfl_fpga_pdata_set_private(struct dfl_feature_platform_data *pdata,
void *private)
{
pdata->private = private;
}
static inline
void *dfl_fpga_pdata_get_private(struct dfl_feature_platform_data *pdata)
{
return pdata->private;
}
struct dfl_feature_ops {
int (*init)(struct platform_device *pdev, struct dfl_feature *feature);
void (*uinit)(struct platform_device *pdev,
struct dfl_feature *feature);
long (*ioctl)(struct platform_device *pdev, struct dfl_feature *feature,
unsigned int cmd, unsigned long arg);
};
#define DFL_FPGA_FEATURE_DEV_FME "dfl-fme"
#define DFL_FPGA_FEATURE_DEV_PORT "dfl-port"
void dfl_fpga_dev_feature_uinit(struct platform_device *pdev);
int dfl_fpga_dev_feature_init(struct platform_device *pdev,
struct dfl_feature_driver *feature_drvs);
int dfl_fpga_dev_ops_register(struct platform_device *pdev,
const struct file_operations *fops,
struct module *owner);
void dfl_fpga_dev_ops_unregister(struct platform_device *pdev);
static inline
struct platform_device *dfl_fpga_inode_to_feature_dev(struct inode *inode)
{
struct dfl_feature_platform_data *pdata;
pdata = container_of(inode->i_cdev, struct dfl_feature_platform_data,
cdev);
return pdata->dev;
}
#define dfl_fpga_dev_for_each_feature(pdata, feature) \
for ((feature) = (pdata)->features; \
(feature) < (pdata)->features + (pdata)->num; (feature)++)
static inline
struct dfl_feature *dfl_get_feature_by_id(struct device *dev, u16 id)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
struct dfl_feature *feature;
dfl_fpga_dev_for_each_feature(pdata, feature)
if (feature->id == id)
return feature;
return NULL;
}
static inline
void __iomem *dfl_get_feature_ioaddr_by_id(struct device *dev, u16 id)
{
struct dfl_feature *feature = dfl_get_feature_by_id(dev, id);
if (feature && feature->ioaddr)
return feature->ioaddr;
WARN_ON(1);
return NULL;
}
static inline bool is_dfl_feature_present(struct device *dev, u16 id)
{
return !!dfl_get_feature_ioaddr_by_id(dev, id);
}
static inline
struct device *dfl_fpga_pdata_to_parent(struct dfl_feature_platform_data *pdata)
{
return pdata->dev->dev.parent->parent;
}
static inline bool dfl_feature_is_fme(void __iomem *base)
{
u64 v = readq(base + DFH);
return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
(FIELD_GET(DFH_ID, v) == DFH_ID_FIU_FME);
}
static inline bool dfl_feature_is_port(void __iomem *base)
{
u64 v = readq(base + DFH);
return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
(FIELD_GET(DFH_ID, v) == DFH_ID_FIU_PORT);
}
static inline u8 dfl_feature_revision(void __iomem *base)
{
return (u8)FIELD_GET(DFH_REVISION, readq(base + DFH));
}
/**
* struct dfl_fpga_enum_info - DFL FPGA enumeration information
*
* @dev: parent device.
* @dfls: list of device feature lists.
* @nr_irqs: number of irqs for all feature devices.
* @irq_table: Linux IRQ numbers for all irqs, indexed by hw irq numbers.
*/
struct dfl_fpga_enum_info {
struct device *dev;
struct list_head dfls;
unsigned int nr_irqs;
int *irq_table;
};
/**
* struct dfl_fpga_enum_dfl - DFL FPGA enumeration device feature list info
*
* @start: base address of this device feature list.
* @len: size of this device feature list.
* @node: node in list of device feature lists.
*/
struct dfl_fpga_enum_dfl {
resource_size_t start;
resource_size_t len;
struct list_head node;
};
struct dfl_fpga_enum_info *dfl_fpga_enum_info_alloc(struct device *dev);
int dfl_fpga_enum_info_add_dfl(struct dfl_fpga_enum_info *info,
resource_size_t start, resource_size_t len);
int dfl_fpga_enum_info_add_irq(struct dfl_fpga_enum_info *info,
unsigned int nr_irqs, int *irq_table);
void dfl_fpga_enum_info_free(struct dfl_fpga_enum_info *info);
/**
* struct dfl_fpga_cdev - container device of DFL based FPGA
*
* @parent: parent device of this container device.
* @region: base fpga region.
* @fme_dev: FME feature device under this container device.
* @lock: mutex lock to protect the port device list.
* @port_dev_list: list of all port feature devices under this container device.
* @released_port_num: released port number under this container device.
*/
struct dfl_fpga_cdev {
struct device *parent;
struct fpga_region *region;
struct device *fme_dev;
struct mutex lock;
struct list_head port_dev_list;
int released_port_num;
};
struct dfl_fpga_cdev *
dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info);
void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev);
/*
* need to drop the device reference with put_device() after use port platform
* device returned by __dfl_fpga_cdev_find_port and dfl_fpga_cdev_find_port
* functions.
*/
struct platform_device *
__dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
int (*match)(struct platform_device *, void *));
static inline struct platform_device *
dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
int (*match)(struct platform_device *, void *))
{
struct platform_device *pdev;
mutex_lock(&cdev->lock);
pdev = __dfl_fpga_cdev_find_port(cdev, data, match);
mutex_unlock(&cdev->lock);
return pdev;
}
int dfl_fpga_cdev_release_port(struct dfl_fpga_cdev *cdev, int port_id);
int dfl_fpga_cdev_assign_port(struct dfl_fpga_cdev *cdev, int port_id);
void dfl_fpga_cdev_config_ports_pf(struct dfl_fpga_cdev *cdev);
int dfl_fpga_cdev_config_ports_vf(struct dfl_fpga_cdev *cdev, int num_vf);
int dfl_fpga_set_irq_triggers(struct dfl_feature *feature, unsigned int start,
unsigned int count, int32_t *fds);
long dfl_feature_ioctl_get_num_irqs(struct platform_device *pdev,
struct dfl_feature *feature,
unsigned long arg);
long dfl_feature_ioctl_set_irq(struct platform_device *pdev,
struct dfl_feature *feature,
unsigned long arg);
#endif /* __FPGA_DFL_H */
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