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drm/gpuvm: fall back to drm_exec_lock_obj()

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Fall back to drm_exec_lock_obj() if num_fences is zero for the
drm_gpuvm_prepare_* function family.

Otherwise dma_resv_reserve_fences() would actually allocate slots even
though num_fences is zero.

Cc: Christian König <christian.koenig@amd.com>
Acked-by: Donald Robson <donald.robson@imgtec.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231129220835.297885-2-dakr@redhat.com
This commit is contained in:
Danilo Krummrich 2023-11-29 23:08:00 +01:00
parent dce94061f0
commit e759f2ca29
2 changed files with 41 additions and 25 deletions
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43
drivers/gpu/drm/drm_gpuvm.c
View file

@ -1085,6 +1085,37 @@ drm_gpuvm_put(struct drm_gpuvm *gpuvm)
}
EXPORT_SYMBOL_GPL(drm_gpuvm_put);
static int
exec_prepare_obj(struct drm_exec *exec, struct drm_gem_object *obj,
unsigned int num_fences)
{
return num_fences ? drm_exec_prepare_obj(exec, obj, num_fences) :
drm_exec_lock_obj(exec, obj);
}
/**
* drm_gpuvm_prepare_vm() - prepare the GPUVMs common dma-resv
* @gpuvm: the &drm_gpuvm
* @exec: the &drm_exec context
* @num_fences: the amount of &dma_fences to reserve
*
* Calls drm_exec_prepare_obj() for the GPUVMs dummy &drm_gem_object; if
* @num_fences is zero drm_exec_lock_obj() is called instead.
*
* Using this function directly, it is the drivers responsibility to call
* drm_exec_init() and drm_exec_fini() accordingly.
*
* Returns: 0 on success, negative error code on failure.
*/
int
drm_gpuvm_prepare_vm(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
unsigned int num_fences)
{
return exec_prepare_obj(exec, gpuvm->r_obj, num_fences);
}
EXPORT_SYMBOL_GPL(drm_gpuvm_prepare_vm);
static int
__drm_gpuvm_prepare_objects(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
@ -1095,7 +1126,7 @@ __drm_gpuvm_prepare_objects(struct drm_gpuvm *gpuvm,
int ret = 0;
for_each_vm_bo_in_list(gpuvm, extobj, &extobjs, vm_bo) {
ret = drm_exec_prepare_obj(exec, vm_bo->obj, num_fences);
ret = exec_prepare_obj(exec, vm_bo->obj, num_fences);
if (ret)
break;
}
@ -1116,7 +1147,7 @@ drm_gpuvm_prepare_objects_locked(struct drm_gpuvm *gpuvm,
drm_gpuvm_resv_assert_held(gpuvm);
list_for_each_entry(vm_bo, &gpuvm->extobj.list, list.entry.extobj) {
ret = drm_exec_prepare_obj(exec, vm_bo->obj, num_fences);
ret = exec_prepare_obj(exec, vm_bo->obj, num_fences);
if (ret)
break;
@ -1134,7 +1165,8 @@ drm_gpuvm_prepare_objects_locked(struct drm_gpuvm *gpuvm,
* @num_fences: the amount of &dma_fences to reserve
*
* Calls drm_exec_prepare_obj() for all &drm_gem_objects the given
* &drm_gpuvm contains mappings of.
* &drm_gpuvm contains mappings of; if @num_fences is zero drm_exec_lock_obj()
* is called instead.
*
* Using this function directly, it is the drivers responsibility to call
* drm_exec_init() and drm_exec_fini() accordingly.
@ -1171,7 +1203,8 @@ EXPORT_SYMBOL_GPL(drm_gpuvm_prepare_objects);
* @num_fences: the amount of &dma_fences to reserve
*
* Calls drm_exec_prepare_obj() for all &drm_gem_objects mapped between @addr
* and @addr + @range.
* and @addr + @range; if @num_fences is zero drm_exec_lock_obj() is called
* instead.
*
* Returns: 0 on success, negative error code on failure.
*/
@ -1186,7 +1219,7 @@ drm_gpuvm_prepare_range(struct drm_gpuvm *gpuvm, struct drm_exec *exec,
drm_gpuvm_for_each_va_range(va, gpuvm, addr, end) {
struct drm_gem_object *obj = va->gem.obj;
ret = drm_exec_prepare_obj(exec, obj, num_fences);
ret = exec_prepare_obj(exec, obj, num_fences);
if (ret)
return ret;
}

23
include/drm/drm_gpuvm.h
View file

@ -544,26 +544,9 @@ struct drm_gpuvm_exec {
} extra;
};
/**
* drm_gpuvm_prepare_vm() - prepare the GPUVMs common dma-resv
* @gpuvm: the &drm_gpuvm
* @exec: the &drm_exec context
* @num_fences: the amount of &dma_fences to reserve
*
* Calls drm_exec_prepare_obj() for the GPUVMs dummy &drm_gem_object.
*
* Using this function directly, it is the drivers responsibility to call
* drm_exec_init() and drm_exec_fini() accordingly.
*
* Returns: 0 on success, negative error code on failure.
*/
static inline int
drm_gpuvm_prepare_vm(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
unsigned int num_fences)
{
return drm_exec_prepare_obj(exec, gpuvm->r_obj, num_fences);
}
int drm_gpuvm_prepare_vm(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
unsigned int num_fences);
int drm_gpuvm_prepare_objects(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,