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iommu/amd: Introduce iommu_dev_data.max_pasids

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This variable will track the number of PASIDs supported by the device.
If IOMMU or device doesn't support PASID then it will be zero.

This will be used while allocating GCR3 table to decide required number
of PASID table levels. Also in PASID bind path it will use this variable
to check whether device supports PASID or not.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240418103400.6229-7-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde 2024-04-18 10:33:51 +00:00 committed by Joerg Roedel
parent 7c5b7176f0
commit a0c47f233e
2 changed files with 13 additions and 0 deletions
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1
drivers/iommu/amd/amd_iommu_types.h
View File

@ -813,6 +813,7 @@ struct iommu_dev_data {
struct device *dev;
u16 devid; /* PCI Device ID */
u32 max_pasids; /* Max supported PASIDs */
u32 flags; /* Holds AMD_IOMMU_DEVICE_FLAG_<*> */
int ats_qdep;
u8 ats_enabled :1; /* ATS state */

12
drivers/iommu/amd/iommu.c
View File

@ -2104,6 +2104,7 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev)
{
struct iommu_device *iommu_dev;
struct amd_iommu *iommu;
struct iommu_dev_data *dev_data;
int ret;
if (!check_device(dev))
@ -2130,6 +2131,17 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev)
iommu_dev = &iommu->iommu;
}
/*
* If IOMMU and device supports PASID then it will contain max
* supported PASIDs, else it will be zero.
*/
dev_data = dev_iommu_priv_get(dev);
if (amd_iommu_pasid_supported() && dev_is_pci(dev) &&
pdev_pasid_supported(dev_data)) {
dev_data->max_pasids = min_t(u32, iommu->iommu.max_pasids,
pci_max_pasids(to_pci_dev(dev)));
}
iommu_completion_wait(iommu);
return iommu_dev;