Am 15.04.21 um 12:17 schrieb Thomas Zimmermann:
Moving the driver-specific mmap code into a GEM object function allows
for using DRM helpers for various mmap callbacks.
This change resolves several inconsistencies between regular mmap and
prime-based mmap. The vm_ops field in vma is now set for all mmap'ed
areas. Previously it way only set for regular mmap calls, prime-based
mmap used TTM's default vm_ops. The function amdgpu_verify_access() is
no longer being called and therefore removed by this patch.
As a side effect, amdgpu_ttm_vm_ops and amdgpu_ttm_fault() are now
implemented in amdgpu's GEM code.
v2:
* rename amdgpu_ttm_vm_ops and amdgpu_ttm_fault() to
amdgpu_gem_vm_ops and amdgpu_gem_fault() (Christian)
* the check for kfd_bo has meanwhile been removed
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
[SNIP]
+static int amdgpu_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
Mhm, just double checking this function is now a core GEM function and
not prime specific?
If yes maybe drop the _prime part.
+ struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
+ struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+ unsigned long asize = amdgpu_bo_size(bo);
+
+ if (!vma->vm_file)
+ return -ENODEV;
+
+ if (!adev)
+ return -ENODEV;
+
+ /* Check for valid size. */
+ if (asize < vma->vm_end - vma->vm_start)
+ return -EINVAL;
Shouldn't we have that check in the common code?
Apart from that looks good to me.
Christian.
+
+ if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
+ (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) {
+ return -EPERM;
+ }
+
+ return drm_gem_ttm_mmap(obj, vma);
+}
+
static const struct drm_gem_object_funcs amdgpu_gem_object_funcs = {
.free = amdgpu_gem_object_free,
.open = amdgpu_gem_object_open,
@@ -212,6 +266,8 @@ static const struct drm_gem_object_funcs amdgpu_gem_object_funcs = {
.export = amdgpu_gem_prime_export,
.vmap = drm_gem_ttm_vmap,
.vunmap = drm_gem_ttm_vunmap,
+ .mmap = amdgpu_gem_prime_mmap,
+ .vm_ops = &amdgpu_gem_vm_ops,
};
/*
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 1485f33c3cc7..d4083c19402b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -152,25 +152,6 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
*placement = abo->placement;
}
-/**
- * amdgpu_verify_access - Verify access for a mmap call
- *
- * @bo: The buffer object to map
- * @filp: The file pointer from the process performing the mmap
- *
- * This is called by ttm_bo_mmap() to verify whether a process
- * has the right to mmap a BO to their process space.
- */
-static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
-{
- struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
-
- if (amdgpu_ttm_tt_get_usermm(bo->ttm))
- return -EPERM;
- return drm_vma_node_verify_access(&abo->tbo.base.vma_node,
- filp->private_data);
-}
-
/**
* amdgpu_ttm_map_buffer - Map memory into the GART windows
* @bo: buffer object to map
@@ -1522,7 +1503,6 @@ static struct ttm_device_funcs amdgpu_bo_driver = {
.eviction_valuable = amdgpu_ttm_bo_eviction_valuable,
.evict_flags = &amdgpu_evict_flags,
.move = &amdgpu_bo_move,
- .verify_access = &amdgpu_verify_access,
.delete_mem_notify = &amdgpu_bo_delete_mem_notify,
.release_notify = &amdgpu_bo_release_notify,
.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
@@ -1897,50 +1877,6 @@ void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
adev->mman.buffer_funcs_enabled = enable;
}
-static vm_fault_t amdgpu_ttm_fault(struct vm_fault *vmf)
-{
- struct ttm_buffer_object *bo = vmf->vma->vm_private_data;
- vm_fault_t ret;
-
- ret = ttm_bo_vm_reserve(bo, vmf);
- if (ret)
- return ret;
-
- ret = amdgpu_bo_fault_reserve_notify(bo);
- if (ret)
- goto unlock;
-
- ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
- TTM_BO_VM_NUM_PREFAULT, 1);
- if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
- return ret;
-
-unlock:
- dma_resv_unlock(bo->base.resv);
- return ret;
-}
-
-static const struct vm_operations_struct amdgpu_ttm_vm_ops = {
- .fault = amdgpu_ttm_fault,
- .open = ttm_bo_vm_open,
- .close = ttm_bo_vm_close,
- .access = ttm_bo_vm_access
-};
-
-int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
-{
- struct drm_file *file_priv = filp->private_data;
- struct amdgpu_device *adev = drm_to_adev(file_priv->minor->dev);
- int r;
-
- r = ttm_bo_mmap(filp, vma, &adev->mman.bdev);
- if (unlikely(r != 0))
- return r;
-
- vma->vm_ops = &amdgpu_ttm_vm_ops;
- return 0;
-}
-
int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
uint64_t dst_offset, uint32_t byte_count,
struct dma_resv *resv,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index dec0db8b0b13..6e51faad7371 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -146,7 +146,6 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
struct dma_resv *resv,
struct dma_fence **fence);
-int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
uint64_t amdgpu_ttm_domain_start(struct amdgpu_device *adev, uint32_t type);
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