Re: [PATCH drm-misc-next 4/5] drm/gpuvm: fall back to drm_exec_lock_obj()

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Hi Christian,

do you think it makes sense to handle this in drm_exec_prepare_obj() or
even dma_resv_reserve_fences() even?

- Danilo

On 11/25/23 00:36, Danilo Krummrich wrote:
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@xxxxxxx>
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
---
  drivers/gpu/drm/drm_gpuvm.c | 36 +++++++++++++++++++++++++++++++++---
  include/drm/drm_gpuvm.h     | 23 +++--------------------
  2 files changed, 36 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
index 54f5e8851de5..d1d1c2379e44 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -1085,6 +1085,36 @@ 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.
+ *
+ * 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 +1125,7 @@ __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 +1146,7 @@ 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;
@@ -1186,7 +1216,7 @@ 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;
  	}
diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index f94fec9a8517..b3f82ec7fb17 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -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,




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