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iommu/amd: Add device errata handling

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Add infrastructure for errata-handling and handle two known
erratas in the IOMMUv2 code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-12-01 12:04:58 +01:00
parent f3572db823
commit 6a113ddc03
3 changed files with 73 additions and 3 deletions
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18
include/linux/amd-iommu.h
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@ -26,6 +26,24 @@
extern int amd_iommu_detect(void);
/**
* amd_iommu_enable_device_erratum() - Enable erratum workaround for device
* in the IOMMUv2 driver
* @pdev: The PCI device the workaround is necessary for
* @erratum: The erratum workaround to enable
*
* Possible values for the erratum number are for now:
* - AMD_PRI_DEV_ERRATUM_ENABLE_RESET - Reset PRI capability when PRI
* is enabled
* - AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE - Limit number of outstanding PRI
* requests to one
*/
#define AMD_PRI_DEV_ERRATUM_ENABLE_RESET 0
#define AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE 1
extern void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum);
#else
static inline int amd_iommu_detect(void) { return -ENODEV; }