drm/i915: Add GPGPU_THREADS_DISPATCHED to the register whitelist

This will allow us to read the number of dispatched compute threads
for GL_ARB_pipeline_statistics_query.
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_cmd_parser.c

@@ -405,6 +405,7 @@ static const struct drm_i915_cmd_table hsw_blt_ring_cmds[] = {
 #define REG64(addr) (addr), (addr + sizeof(u32))
 
 static const u32 gen7_render_regs[] = {
+	REG64(GPGPU_THREADS_DISPATCHED),
 	REG64(HS_INVOCATION_COUNT),
 	REG64(DS_INVOCATION_COUNT),
 	REG64(IA_VERTICES_COUNT),
@@ -1153,6 +1154,7 @@ int i915_cmd_parser_get_version(void)
 	 *    hardware parsing enabled (so does not allow new use cases).
 	 * 2. Allow access to the MI_PREDICATE_SRC0 and
 	 *    MI_PREDICATE_SRC1 registers.
+	 * 3. Allow access to the GPGPU_THREADS_DISPATCHED register.
 	 */
-	return 2;
+	return 3;
 }

drivers/gpu/drm/i915/i915_reg.h

@@ -463,17 +463,18 @@
  */
 #define BCS_SWCTRL 0x22200
 
-#define HS_INVOCATION_COUNT 0x2300
-#define DS_INVOCATION_COUNT 0x2308
-#define IA_VERTICES_COUNT   0x2310
-#define IA_PRIMITIVES_COUNT 0x2318
-#define VS_INVOCATION_COUNT 0x2320
-#define GS_INVOCATION_COUNT 0x2328
-#define GS_PRIMITIVES_COUNT 0x2330
-#define CL_INVOCATION_COUNT 0x2338
-#define CL_PRIMITIVES_COUNT 0x2340
-#define PS_INVOCATION_COUNT 0x2348
-#define PS_DEPTH_COUNT      0x2350
+#define GPGPU_THREADS_DISPATCHED        0x2290
+#define HS_INVOCATION_COUNT             0x2300
+#define DS_INVOCATION_COUNT             0x2308
+#define IA_VERTICES_COUNT               0x2310
+#define IA_PRIMITIVES_COUNT             0x2318
+#define VS_INVOCATION_COUNT             0x2320
+#define GS_INVOCATION_COUNT             0x2328
+#define GS_PRIMITIVES_COUNT             0x2330
+#define CL_INVOCATION_COUNT             0x2338
+#define CL_PRIMITIVES_COUNT             0x2340
+#define PS_INVOCATION_COUNT             0x2348
+#define PS_DEPTH_COUNT                  0x2350
 
 /* There are the 4 64-bit counter registers, one for each stream output */
 #define GEN7_SO_NUM_PRIMS_WRITTEN(n) (0x5200 + (n) * 8)