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drm/amdkfd: Fix ATS capablity was not reported correctly on some APUs

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Because CRAT_CU_FLAGS_IOMMU_PRESENT was not set in some BIOS crat, we
need to workaround this.

For future compatibility, we also overwrite the bit in capability according
to the value of needs_iommu_device.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yong Zhao
2018-09-12 21:42:20 -04:00
committed by Alex Deucher
parent 15426dbb65
commit 44d8cc6f1a
3 changed files with 29 additions and 6 deletions
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13
drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
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@@ -62,9 +62,20 @@ int kfd_iommu_device_init(struct kfd_dev *kfd)
struct amd_iommu_device_info iommu_info;
unsigned int pasid_limit;
int err;
struct kfd_topology_device *top_dev;
if (!kfd->device_info->needs_iommu_device)
top_dev = kfd_topology_device_by_id(kfd->id);
/*
* Overwrite ATS capability according to needs_iommu_device to fix
* potential missing corresponding bit in CRAT of BIOS.
*/
if (!kfd->device_info->needs_iommu_device) {
top_dev->node_props.capability &= ~HSA_CAP_ATS_PRESENT;
return 0;
}
top_dev->node_props.capability |= HSA_CAP_ATS_PRESENT;
iommu_info.flags = 0;
err = amd_iommu_device_info(kfd->pdev, &iommu_info);