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x86/amd-iommu: Work around S3 BIOS bug 

This patch adds a workaround for an IOMMU BIOS problem to
the AMD IOMMU driver. The result of the bug is that the
IOMMU does not execute commands anymore when the system
comes out of the S3 state resulting in system failure. The
bug in the BIOS is that is does not restore certain hardware
specific registers correctly. This workaround reads out the
contents of these registers at boot time and restores them
on resume from S3. The workaround is limited to the specific
IOMMU chipset where this problem occurs.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2010-09-23 15:15:19 +02:00
parent e9bf519711
commit 4c894f47bb
4 changed files with 36 additions and 0 deletions
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6
arch/x86/include/asm/amd_iommu_proto.h
View File

@ -38,4 +38,10 @@ static inline void amd_iommu_stats_init(void) { }
#endif /* !CONFIG_AMD_IOMMU_STATS */
static inline bool is_rd890_iommu(struct pci_dev *pdev)
{
return (pdev->vendor == PCI_VENDOR_ID_ATI) &&
(pdev->device == PCI_DEVICE_ID_RD890_IOMMU);
}
#endif /* _ASM_X86_AMD_IOMMU_PROTO_H */

9
arch/x86/include/asm/amd_iommu_types.h
View File

@ -414,6 +414,15 @@ struct amd_iommu {
/* default dma_ops domain for that IOMMU */
struct dma_ops_domain *default_dom;
/*
* This array is required to work around a potential BIOS bug.
* The BIOS may miss to restore parts of the PCI configuration
* space when the system resumes from S3. The result is that the
* IOMMU does not execute commands anymore which leads to system
* failure.
*/
u32 cache_cfg[4];
};
/*

18
arch/x86/kernel/amd_iommu_init.c
View File

@ -632,6 +632,13 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu)
iommu->last_device = calc_devid(MMIO_GET_BUS(range),
MMIO_GET_LD(range));
iommu->evt_msi_num = MMIO_MSI_NUM(misc);
if (is_rd890_iommu(iommu->dev)) {
pci_read_config_dword(iommu->dev, 0xf0, &iommu->cache_cfg[0]);
pci_read_config_dword(iommu->dev, 0xf4, &iommu->cache_cfg[1]);
pci_read_config_dword(iommu->dev, 0xf8, &iommu->cache_cfg[2]);
pci_read_config_dword(iommu->dev, 0xfc, &iommu->cache_cfg[3]);
}
}
/*
@ -1120,6 +1127,16 @@ static void iommu_init_flags(struct amd_iommu *iommu)
iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
}
static void iommu_apply_quirks(struct amd_iommu *iommu)
{
if (is_rd890_iommu(iommu->dev)) {
pci_write_config_dword(iommu->dev, 0xf0, iommu->cache_cfg[0]);
pci_write_config_dword(iommu->dev, 0xf4, iommu->cache_cfg[1]);
pci_write_config_dword(iommu->dev, 0xf8, iommu->cache_cfg[2]);
pci_write_config_dword(iommu->dev, 0xfc, iommu->cache_cfg[3]);
}
}
/*
* This function finally enables all IOMMUs found in the system after
* they have been initialized
@ -1130,6 +1147,7 @@ static void enable_iommus(void)
for_each_iommu(iommu) {
iommu_disable(iommu);
iommu_apply_quirks(iommu);
iommu_init_flags(iommu);
iommu_set_device_table(iommu);
iommu_enable_command_buffer(iommu);

3
include/linux/pci_ids.h
View File

@ -393,6 +393,9 @@
#define PCI_DEVICE_ID_VLSI_82C147 0x0105
#define PCI_DEVICE_ID_VLSI_VAS96011 0x0702
/* AMD RD890 Chipset */
#define PCI_DEVICE_ID_RD890_IOMMU 0x5a23
#define PCI_VENDOR_ID_ADL 0x1005
#define PCI_DEVICE_ID_ADL_2301 0x2301