drm/vmwgfx: add support for updating only offsets of constant buffers

This adds support for the
SVGA_3D_CMD_DX_SET_VS/PS/GS/HS/DS/CS_CONSTANT_BUFFER_OFFSET commands (which only update
the offset, but don't rebind the buffer), which saves some overhead.

Signed-off-by: Roland Scheidegger <[e-mail]>
Reviewed-by: Charmaine Lee <[e-mail]>
Reviewed-by: Martin Krastev <[e-mail]>
Signed-off-by: Zack Rusin <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/vmwgfx/vmwgfx_binding.c

···
 }
 
 /**
+ * vmw_binding_cb_offset_update: Update the offset of a cb binding
+ *
+ * @cbs: Pointer to the context binding state tracker.
+ * @shader_slot: The shader slot of the binding.
+ * @slot: The slot of the binding.
+ * @offsetInBytes: The new offset of the binding.
+ *
+ * Updates the offset of an existing cb binding in the context binding
+ * state structure @cbs.
+ */
+void vmw_binding_cb_offset_update(struct vmw_ctx_binding_state *cbs,
+				  u32 shader_slot, u32 slot, u32 offsetInBytes)
+{
+	struct vmw_ctx_bindinfo *loc =
+		vmw_binding_loc(cbs, vmw_ctx_binding_cb, shader_slot, slot);
+	struct vmw_ctx_bindinfo_cb *loc_cb =
+		(struct vmw_ctx_bindinfo_cb *)((u8 *) loc);
+	loc_cb->offset = offsetInBytes;
+}
+
+/**
  * vmw_binding_add_uav_index - Add UAV index for tracking.
  * @cbs: Pointer to the context binding state tracker.
  * @slot: UAV type to which bind this index.

drivers/gpu/drm/vmwgfx/vmwgfx_binding.h

···
 extern void vmw_binding_add(struct vmw_ctx_binding_state *cbs,
 			    const struct vmw_ctx_bindinfo *ci,
 			    u32 shader_slot, u32 slot);
+extern void vmw_binding_cb_offset_update(struct vmw_ctx_binding_state *cbs,
+					 u32 shader_slot, u32 slot, u32 offsetInBytes);
 extern void vmw_binding_add_uav_index(struct vmw_ctx_binding_state *cbs,
 				      uint32 slot, uint32 splice_index);
 extern void

drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c

···
 }
 
 /**
+ * vmw_cmd_dx_set_constant_buffer_offset - Validate
+ * SVGA_3D_CMD_DX_SET_VS/PS/GS/HS/DS/CS_CONSTANT_BUFFER_OFFSET command.
+ *
+ * @dev_priv: Pointer to a device private struct.
+ * @sw_context: The software context being used for this batch.
+ * @header: Pointer to the command header in the command stream.
+ */
+static int
+vmw_cmd_dx_set_constant_buffer_offset(struct vmw_private *dev_priv,
+				      struct vmw_sw_context *sw_context,
+				      SVGA3dCmdHeader *header)
+{
+	VMW_DECLARE_CMD_VAR(*cmd, SVGA3dCmdDXSetConstantBufferOffset);
+
+	struct vmw_ctx_validation_info *ctx_node = VMW_GET_CTX_NODE(sw_context);
+	u32 shader_slot;
+
+	if (!has_sm5_context(dev_priv))
+		return -EINVAL;
+
+	if (!ctx_node)
+		return -EINVAL;
+
+	cmd = container_of(header, typeof(*cmd), header);
+	if (cmd->body.slot >= SVGA3D_DX_MAX_CONSTBUFFERS) {
+		VMW_DEBUG_USER("Illegal const buffer slot %u.\n",
+			       (unsigned int) cmd->body.slot);
+		return -EINVAL;
+	}
+
+	shader_slot = cmd->header.id - SVGA_3D_CMD_DX_SET_VS_CONSTANT_BUFFER_OFFSET;
+	vmw_binding_cb_offset_update(ctx_node->staged, shader_slot,
+				     cmd->body.slot, cmd->body.offsetInBytes);
+
+	return 0;
+}
+
+/**
  * vmw_cmd_dx_set_shader_res - Validate SVGA_3D_CMD_DX_SET_SHADER_RESOURCES
  * command
  *
···
 		    &vmw_cmd_pred_copy_check, true, false, true),
 	VMW_CMD_DEF(SVGA_3D_CMD_DX_TRANSFER_FROM_BUFFER,
 		    &vmw_cmd_dx_transfer_from_buffer,
+		    true, false, true),
+	VMW_CMD_DEF(SVGA_3D_CMD_DX_SET_VS_CONSTANT_BUFFER_OFFSET,
+		    &vmw_cmd_dx_set_constant_buffer_offset,
+		    true, false, true),
+	VMW_CMD_DEF(SVGA_3D_CMD_DX_SET_PS_CONSTANT_BUFFER_OFFSET,
+		    &vmw_cmd_dx_set_constant_buffer_offset,
+		    true, false, true),
+	VMW_CMD_DEF(SVGA_3D_CMD_DX_SET_GS_CONSTANT_BUFFER_OFFSET,
+		    &vmw_cmd_dx_set_constant_buffer_offset,
+		    true, false, true),
+	VMW_CMD_DEF(SVGA_3D_CMD_DX_SET_HS_CONSTANT_BUFFER_OFFSET,
+		    &vmw_cmd_dx_set_constant_buffer_offset,
+		    true, false, true),
+	VMW_CMD_DEF(SVGA_3D_CMD_DX_SET_DS_CONSTANT_BUFFER_OFFSET,
+		    &vmw_cmd_dx_set_constant_buffer_offset,
+		    true, false, true),
+	VMW_CMD_DEF(SVGA_3D_CMD_DX_SET_CS_CONSTANT_BUFFER_OFFSET,
+		    &vmw_cmd_dx_set_constant_buffer_offset,
 		    true, false, true),
 	VMW_CMD_DEF(SVGA_3D_CMD_INTRA_SURFACE_COPY, &vmw_cmd_intra_surface_copy,
 		    true, false, true),