[RFC PATCH 16/18] drm/amdgpu: Implement SET_PRIORITY GEM op

[Friedrich Vock]

Used by userspace to adjust buffer priorities in response to changes in
application demand and memory pressure.

Signed-off-by: Friedrich Vock <friedrich.vock at gmx.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 20 ++++++++++++++++++++
 include/uapi/drm/amdgpu_drm.h           |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 5ca13e2e50f50..6107810a9c205 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -836,8 +836,10 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
 {
 	struct amdgpu_device *adev = drm_to_adev(dev);
 	struct drm_amdgpu_gem_op *args = data;
+	struct ttm_resource_manager *man;
 	struct drm_gem_object *gobj;
 	struct amdgpu_vm_bo_base *base;
+	struct ttm_operation_ctx ctx;
 	struct amdgpu_bo *robj;
 	int r;

@@ -851,6 +853,9 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
 	if (unlikely(r))
 		goto out;

+	memset(&ctx, 0, sizeof(ctx));
+	ctx.interruptible = true;
+
 	switch (args->op) {
 	case AMDGPU_GEM_OP_GET_GEM_CREATE_INFO: {
 		struct drm_amdgpu_gem_create_in info;
@@ -898,6 +903,21 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,

 		amdgpu_bo_unreserve(robj);
 		break;
+	case AMDGPU_GEM_OP_SET_PRIORITY:
+		if (args->value > AMDGPU_BO_PRIORITY_MAX_USER)
+			args->value = AMDGPU_BO_PRIORITY_MAX_USER;
+		ttm_bo_update_priority(&robj->tbo, args->value);
+		if (robj->tbo.evicted_type != TTM_NUM_MEM_TYPES) {
+			ttm_bo_try_unevict(&robj->tbo, &ctx);
+			amdgpu_bo_unreserve(robj);
+		} else {
+			amdgpu_bo_unreserve(robj);
+			man = ttm_manager_type(robj->tbo.bdev,
+				robj->tbo.resource->mem_type);
+			ttm_mem_unevict_evicted(robj->tbo.bdev, man,
+						true);
+		}
+		break;
 	default:
 		amdgpu_bo_unreserve(robj);
 		r = -EINVAL;
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index bdbe6b262a78d..53552dd489b9b 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -531,6 +531,7 @@ union drm_amdgpu_wait_fences {

 #define AMDGPU_GEM_OP_GET_GEM_CREATE_INFO	0
 #define AMDGPU_GEM_OP_SET_PLACEMENT		1
+#define AMDGPU_GEM_OP_SET_PRIORITY              2

 /* Sets or returns a value associated with a buffer. */
 struct drm_amdgpu_gem_op {
--
2.44.0