forked from Minki/linux
7d43c2e42c
The iommu=group_mf is really no longer needed with the addition of ACS
support in IOMMU drivers creating groups. Most multifunction devices
will now be grouped already. If a device has gone to the trouble of
exposing ACS, trust that it works. We can use the device specific ACS
function for fixing devices we trust individually. This largely
reverts bcb71abe.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
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* Dynamic DMA mapping support.
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/dmar.h>
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#include <asm/iommu.h>
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#include <asm/machvec.h>
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#include <linux/dma-mapping.h>
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#ifdef CONFIG_INTEL_IOMMU
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#include <linux/kernel.h>
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#include <asm/page.h>
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dma_addr_t bad_dma_address __read_mostly;
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EXPORT_SYMBOL(bad_dma_address);
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static int iommu_sac_force __read_mostly;
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int no_iommu __read_mostly;
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#ifdef CONFIG_IOMMU_DEBUG
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int force_iommu __read_mostly = 1;
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#else
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int force_iommu __read_mostly;
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#endif
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int iommu_pass_through;
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/* Dummy device used for NULL arguments (normally ISA). Better would
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be probably a smaller DMA mask, but this is bug-to-bug compatible
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to i386. */
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struct device fallback_dev = {
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.init_name = "fallback device",
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.coherent_dma_mask = DMA_BIT_MASK(32),
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.dma_mask = &fallback_dev.coherent_dma_mask,
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};
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extern struct dma_map_ops intel_dma_ops;
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static int __init pci_iommu_init(void)
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{
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if (iommu_detected)
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intel_iommu_init();
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return 0;
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}
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/* Must execute after PCI subsystem */
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fs_initcall(pci_iommu_init);
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void pci_iommu_shutdown(void)
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{
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return;
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}
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void __init
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iommu_dma_init(void)
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{
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return;
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}
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int iommu_dma_supported(struct device *dev, u64 mask)
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{
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/* Copied from i386. Doesn't make much sense, because it will
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only work for pci_alloc_coherent.
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The caller just has to use GFP_DMA in this case. */
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if (mask < DMA_BIT_MASK(24))
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return 0;
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/* Tell the device to use SAC when IOMMU force is on. This
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allows the driver to use cheaper accesses in some cases.
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Problem with this is that if we overflow the IOMMU area and
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return DAC as fallback address the device may not handle it
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correctly.
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As a special case some controllers have a 39bit address
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mode that is as efficient as 32bit (aic79xx). Don't force
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SAC for these. Assume all masks <= 40 bits are of this
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type. Normally this doesn't make any difference, but gives
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more gentle handling of IOMMU overflow. */
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if (iommu_sac_force && (mask >= DMA_BIT_MASK(40))) {
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dev_info(dev, "Force SAC with mask %llx\n", mask);
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return 0;
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}
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return 1;
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}
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EXPORT_SYMBOL(iommu_dma_supported);
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void __init pci_iommu_alloc(void)
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{
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dma_ops = &intel_dma_ops;
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dma_ops->sync_single_for_cpu = machvec_dma_sync_single;
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dma_ops->sync_sg_for_cpu = machvec_dma_sync_sg;
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dma_ops->sync_single_for_device = machvec_dma_sync_single;
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dma_ops->sync_sg_for_device = machvec_dma_sync_sg;
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dma_ops->dma_supported = iommu_dma_supported;
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/*
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* The order of these functions is important for
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* fall-back/fail-over reasons
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*/
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detect_intel_iommu();
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#ifdef CONFIG_SWIOTLB
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pci_swiotlb_init();
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#endif
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}
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#endif
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