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drm/amdkfd: Allow access for mmapping KFD BOs

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DRM render node file handles are used for CPU mapping of BOs using mmap
by the Thunk. It uses the DRM render node of the GPU where the BO was
allocated.

DRM allows mmap access automatically when it creates a GEM handle for a
BO. KFD BOs don't have GEM handles, so KFD needs to manage access
manually. Use drm_vma_node_allow to allow user mode to mmap BOs allocated
with kfd_ioctl_alloc_memory_of_gpu through the DRM render node that was
used in the kfd_ioctl_acquire_vm call for the same GPU.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Philip Yang <philip.yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling
2021-04-07 18:46:26 -04:00
committed by Alex Deucher
parent b40a6ab2cf
commit d4ec4bdc0b
4 changed files with 30 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/amd/amdkfd/kfd_process.c
View File

@@ -648,7 +648,8 @@ static void kfd_process_free_gpuvm(struct kgd_mem *mem,
struct kfd_dev *dev = pdd->dev;
amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(dev->kgd, mem, pdd->drm_priv);
amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->kgd, mem, NULL);
amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->kgd, mem, pdd->drm_priv,
NULL);
}
/* kfd_process_alloc_gpuvm - Allocate GPU VM for the KFD process
@@ -712,7 +713,8 @@ sync_memory_failed:
return err;
err_map_mem:
amdgpu_amdkfd_gpuvm_free_memory_of_gpu(kdev->kgd, mem, NULL);
amdgpu_amdkfd_gpuvm_free_memory_of_gpu(kdev->kgd, mem, pdd->drm_priv,
NULL);
err_alloc_mem:
*kptr = NULL;
return err;
@@ -907,7 +909,8 @@ static void kfd_process_device_free_bos(struct kfd_process_device *pdd)
peer_pdd->dev->kgd, mem, peer_pdd->drm_priv);
}
amdgpu_amdkfd_gpuvm_free_memory_of_gpu(pdd->dev->kgd, mem, NULL);
amdgpu_amdkfd_gpuvm_free_memory_of_gpu(pdd->dev->kgd, mem,
pdd->drm_priv, NULL);
kfd_process_device_remove_obj_handle(pdd, id);
}
}