tests: add gem_hangcheck_forcewake

Provokes the forcewake warning when the hangcheck runs and no
one waits for the gpu (and hence holds the dev->struct_mutex).

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/Makefile.am

@@ -51,6 +51,7 @@ TESTS = getversion \
 	gem_double_irq_loop \
 	gem_ring_sync_loop \
 	gem_pipe_control_store_loop \
+	gem_hangcheck_forcewake \
 	$(NULL)
 
 HANG = \

tests/gem_hangcheck_forcewake.c

@@ -0,0 +1,119 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Daniel Vetter <daniel.vetter@ffwll.ch>
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+#include "intel_bufmgr.h"
+#include "intel_batchbuffer.h"
+#include "intel_gpu_tools.h"
+
+/*
+ * Testcase: Provoke the hangcheck timer on an otherwise idle system
+ *
+ * This tries to hit forcewake locking bugs when the hangcheck runs. Somehow we
+ * often luck out and the hangcheck runs while someone else is already holding
+ * the dev->struct_mutex.
+ *
+ * It's imperative that nothing else runs while this test runs, i.e. kill your X
+ * session, please.
+ */
+
+static drm_intel_bufmgr *bufmgr;
+struct intel_batchbuffer *batch;
+
+uint32_t blob[2048*2048];
+
+#define MAX_BLT_SIZE 128
+int main(int argc, char **argv)
+{
+	drm_intel_bo *bo = NULL;
+	uint32_t tiling_mode = I915_TILING_X;
+	unsigned long pitch, act_size;
+	int fd, i, devid;
+
+	memset(blob, 'A', sizeof(blob));
+
+	fd = drm_open_any();
+
+	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
+	drm_intel_bufmgr_gem_enable_reuse(bufmgr);
+	devid = intel_get_drm_devid(fd);
+	batch = intel_batchbuffer_alloc(bufmgr, devid);
+
+	act_size = 2048;
+	printf("filling ring\n");
+	drm_intel_bo_unreference(bo);
+	bo = drm_intel_bo_alloc_tiled(bufmgr, "tiled bo", act_size, act_size,
+				      4, &tiling_mode, &pitch, 0);
+
+	drm_intel_bo_subdata(bo, 0, act_size*act_size*4, blob);
+
+	if (IS_965(devid))
+		pitch /= 4;
+
+	for (i = 0; i < 10000; i++) {
+		BEGIN_BATCH(8);
+		OUT_BATCH(XY_SRC_COPY_BLT_CMD |
+			  XY_SRC_COPY_BLT_WRITE_ALPHA |
+			  XY_SRC_COPY_BLT_WRITE_RGB |
+			  XY_SRC_COPY_BLT_SRC_TILED |
+			  XY_SRC_COPY_BLT_DST_TILED);
+		OUT_BATCH((3 << 24) | /* 32 bits */
+			  (0xcc << 16) | /* copy ROP */
+			  pitch);
+		OUT_BATCH(0 << 16 | 1024);
+		OUT_BATCH((2048) << 16 | (2048));
+		OUT_RELOC_FENCED(bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
+		OUT_BATCH(0 << 16 | 0);
+		OUT_BATCH(pitch);
+		OUT_RELOC_FENCED(bo, I915_GEM_DOMAIN_RENDER, 0, 0);
+		ADVANCE_BATCH();
+	}
+
+	printf("waiting\n");
+	sleep(10);
+
+	printf("done waiting, check dmesg\n");
+	drm_intel_bo_unreference(bo);
+
+	intel_batchbuffer_free(batch);
+	drm_intel_bufmgr_destroy(bufmgr);
+
+	close(fd);
+
+	return 0;
+}