nouveau/gsp: convert gsp errors to generic errors

This should let the upper layers retry as needed on EAGAIN.

There may be other values we will care about in the future, but
this covers our present needs.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231222043308.3090089-8-airlied@gmail.com

Author: airlied

drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c

@@ -70,6 +70,20 @@ struct r535_gsp_msg {
 
 #define GSP_MSG_HDR_SIZE offsetof(struct r535_gsp_msg, data)
 
+static int
+r535_rpc_status_to_errno(uint32_t rpc_status)
+{
+	switch (rpc_status) {
+	case 0x55: /* NV_ERR_NOT_READY */
+	case 0x66: /* NV_ERR_TIMEOUT_RETRY */
+		return -EAGAIN;
+	case 0x51: /* NV_ERR_NO_MEMORY */
+		return -ENOMEM;
+	default:
+		return -EINVAL;
+	}
+}
+
 static void *
 r535_gsp_msgq_wait(struct nvkm_gsp *gsp, u32 repc, u32 *prepc, int *ptime)
 {
@@ -584,8 +598,9 @@ r535_gsp_rpc_rm_alloc_push(struct nvkm_gsp_object *object, void *argv, u32 repc)
 		return rpc;
 
 	if (rpc->status) {
-		nvkm_error(&gsp->subdev, "RM_ALLOC: 0x%x\n", rpc->status);
-		ret = ERR_PTR(-EINVAL);
+		ret = ERR_PTR(r535_rpc_status_to_errno(rpc->status));
+		if (ret != -EAGAIN)
+			nvkm_error(&gsp->subdev, "RM_ALLOC: 0x%x\n", rpc->status);
 	} else {
 		ret = repc ? rpc->params : NULL;
 	}
@@ -639,9 +654,10 @@ r535_gsp_rpc_rm_ctrl_push(struct nvkm_gsp_object *object, void *argv, u32 repc)
 		return rpc;
 
 	if (rpc->status) {
-		nvkm_error(&gsp->subdev, "cli:0x%08x obj:0x%08x ctrl cmd:0x%08x failed: 0x%08x\n",
-			   object->client->object.handle, object->handle, rpc->cmd, rpc->status);
-		ret = ERR_PTR(-EINVAL);
+		ret = ERR_PTR(r535_rpc_status_to_errno(rpc->status));
+		if (ret != -EAGAIN)
+			nvkm_error(&gsp->subdev, "cli:0x%08x obj:0x%08x ctrl cmd:0x%08x failed: 0x%08x\n",
+				   object->client->object.handle, object->handle, rpc->cmd, rpc->status);
 	} else {
 		ret = repc ? rpc->params : NULL;
 	}