[PATCH 1/2] tests: Exercise new API for using a LUT with the execbuffer

[PATCH 1/2] tests: Exercise new API for using a LUT with the execbuffer

[Chris Wilson]

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.am      |    1 +
 tests/gem_lut_handle.c |  109 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100644 tests/gem_lut_handle.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 18f7148..16d187f 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -37,6 +37,7 @@ TESTS_progs = \
 	gem_exec_blt \
 	gem_exec_faulting_reloc \
 	gem_readwrite \
+	gem_lut_handle \
 	gem_mmap \
 	gem_mmap_offset_exhaustion \
 	gem_hangcheck_forcewake \
diff --git a/tests/gem_lut_handle.c b/tests/gem_lut_handle.c
new file mode 100644
index 0000000..64676f2
--- /dev/null
+++ b/tests/gem_lut_handle.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright © 20012 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:
+ *    Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+/* Exercises the basic execbuffer using theh andle LUT interface */
+
+#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"
+
+#define MI_BATCH_BUFFER_END	(0xA<<23)
+#define BATCH_SIZE		(1024*1024)
+
+#define LOCAL_I915_EXEC_HANDLE_LUT (1<<11)
+
+#define USE_LUT 0x1
+#define BROKEN 0x2
+
+static int exec(int fd, uint32_t handle, unsigned int flags)
+{
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_exec_object2 gem_exec[1];
+	struct drm_i915_gem_relocation_entry gem_reloc[1];
+
+	gem_reloc[0].offset = 1024;
+	gem_reloc[0].delta = 0;
+	gem_reloc[0].target_handle =
+		!!(flags & USE_LUT) ^ !!(flags & BROKEN) ? 0 : handle;
+	gem_reloc[0].read_domains = I915_GEM_DOMAIN_RENDER;
+	gem_reloc[0].write_domain = 0;
+	gem_reloc[0].presumed_offset = 0;
+
+	gem_exec[0].handle = handle;
+	gem_exec[0].relocation_count = 1;
+	gem_exec[0].relocs_ptr = (uintptr_t) gem_reloc;
+	gem_exec[0].alignment = 0;
+	gem_exec[0].offset = 0;
+	gem_exec[0].flags = 0;
+	gem_exec[0].rsvd1 = 0;
+	gem_exec[0].rsvd2 = 0;
+
+	execbuf.buffers_ptr = (uintptr_t)gem_exec;
+	execbuf.buffer_count = 1;
+	execbuf.batch_start_offset = 0;
+	execbuf.batch_len = 8;
+	execbuf.cliprects_ptr = 0;
+	execbuf.num_cliprects = 0;
+	execbuf.DR1 = 0;
+	execbuf.DR4 = 0;
+	execbuf.flags = flags & USE_LUT ? LOCAL_I915_EXEC_HANDLE_LUT : 0;
+	i915_execbuffer2_set_context_id(execbuf, 0);
+	execbuf.rsvd2 = 0;
+
+	return drmIoctl(fd,
+			DRM_IOCTL_I915_GEM_EXECBUFFER2,
+			&execbuf);
+}
+
+int main(int argc, char **argv)
+{
+	uint32_t batch[2] = {MI_BATCH_BUFFER_END};
+	uint32_t handle;
+	int fd;
+
+	fd = drm_open_any();
+
+	handle = gem_create(fd, 4096);
+	gem_write(fd, handle, 0, batch, sizeof(batch));
+
+	do_or_die(exec(fd, handle, 0));
+	do_or_die(exec(fd, handle, USE_LUT));
+
+	assert(exec(fd, handle, BROKEN) == -1 && errno == ENOENT);
+	assert(exec(fd, handle, USE_LUT | BROKEN) == -1 && errno == ENOENT);
+
+	return 0;
+}
-- 
1.7.10.4

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[PATCH 2/2] tests: Benchmark new API for using a LUT with the execbuffer

[Chris Wilson]

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.am           |    1 +
 tests/gem_exec_lut_handle.c |  175 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 176 insertions(+)
 create mode 100644 tests/gem_exec_lut_handle.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 16d187f..ad6f88e 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -38,6 +38,7 @@ TESTS_progs = \
 	gem_exec_faulting_reloc \
 	gem_readwrite \
 	gem_lut_handle \
+	gem_exec_lut_handle \
 	gem_mmap \
 	gem_mmap_offset_exhaustion \
 	gem_hangcheck_forcewake \
diff --git a/tests/gem_exec_lut_handle.c b/tests/gem_exec_lut_handle.c
new file mode 100644
index 0000000..b2d6bd3
--- /dev/null
+++ b/tests/gem_exec_lut_handle.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright © 20012 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:
+ *    Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+/* Exercises the basic execbuffer using theh andle LUT interface */
+
+#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"
+
+#define MI_BATCH_BUFFER_END	(0xA<<23)
+#define BATCH_SIZE		(1024*1024)
+
+#define LOCAL_I915_EXEC_NO_RELOC (1<<10)
+#define LOCAL_I915_EXEC_HANDLE_LUT (1<<11)
+
+#define MAX_NUM_EXEC 2048
+#define MAX_NUM_RELOC 4096
+
+#define USE_LUT 0x1
+#define SKIP_RELOC 0x2
+#define NO_RELOC 0x4
+
+struct drm_i915_gem_exec_object2 gem_exec[MAX_NUM_EXEC+1];
+struct drm_i915_gem_relocation_entry gem_reloc[MAX_NUM_RELOC];
+
+static uint32_t state = 0x12345678;
+
+static uint32_t
+hars_petruska_f54_1_random (void)
+{
+#define rol(x,k) ((x << k) | (x >> (32-k)))
+    return state = (state ^ rol (state, 5) ^ rol (state, 24)) + 0x37798849;
+#undef rol
+}
+
+
+static int exec(int fd, int num_exec, int num_relocs, unsigned flags)
+{
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_exec_object2 *objects;
+	int i;
+
+	gem_exec[MAX_NUM_EXEC].relocation_count = num_relocs;
+	gem_exec[MAX_NUM_EXEC].relocs_ptr = (uintptr_t) gem_reloc;
+
+	objects = gem_exec + MAX_NUM_EXEC - num_exec;
+
+	for (i = 0; i < num_relocs; i++) {
+		int target = hars_petruska_f54_1_random() % num_exec;
+		gem_reloc[i].offset = 1024;
+		gem_reloc[i].delta = 0;
+		gem_reloc[i].target_handle =
+			flags & USE_LUT ? target : objects[target].handle;
+		gem_reloc[i].read_domains = I915_GEM_DOMAIN_RENDER;
+		gem_reloc[i].write_domain = 0;
+		gem_reloc[i].presumed_offset = 0;
+		if (flags & SKIP_RELOC)
+			gem_reloc[i].presumed_offset = objects[target].offset;
+	}
+
+	execbuf.buffers_ptr = (uintptr_t)objects;
+	execbuf.buffer_count = num_exec + 1;
+	execbuf.batch_start_offset = 0;
+	execbuf.batch_len = 8;
+	execbuf.cliprects_ptr = 0;
+	execbuf.num_cliprects = 0;
+	execbuf.DR1 = 0;
+	execbuf.DR4 = 0;
+	execbuf.flags = 0;
+	if (flags & USE_LUT)
+		execbuf.flags |= LOCAL_I915_EXEC_HANDLE_LUT;
+	if (flags & NO_RELOC)
+		execbuf.flags |= LOCAL_I915_EXEC_NO_RELOC;
+	i915_execbuffer2_set_context_id(execbuf, 0);
+	execbuf.rsvd2 = 0;
+
+	return drmIoctl(fd,
+			DRM_IOCTL_I915_GEM_EXECBUFFER2,
+			&execbuf);
+}
+
+#define ELAPSED(a,b) (1e6*((b)->tv_sec - (a)->tv_sec) + ((b)->tv_usec - (a)->tv_usec))
+int main(int argc, char **argv)
+{
+	uint32_t batch[2] = {MI_BATCH_BUFFER_END};
+	int fd, n, m, count;
+	const struct {
+		const char *name;
+		unsigned int flags;
+	} pass[] = {
+		{ .name = "relocation", .flags = 0 },
+		{ .name = "skip-relocs", .flags = SKIP_RELOC },
+		{ .name = "no-relocs", .flags = NO_RELOC },
+		{ .name = NULL },
+	}, *p;
+
+	fd = drm_open_any();
+
+	for (n = 0; n < MAX_NUM_EXEC; n++) {
+		gem_exec[n].handle = gem_create(fd, 4096);
+		gem_exec[n].relocation_count = 0;
+		gem_exec[n].relocs_ptr = 0;
+		gem_exec[n].alignment = 0;
+		gem_exec[n].offset = 0;
+		gem_exec[n].flags = 0;
+		gem_exec[n].rsvd1 = 0;
+		gem_exec[n].rsvd2 = 0;
+	}
+
+	gem_exec[n].handle =  gem_create(fd, 4096);
+	gem_write(fd, gem_exec[n].handle, 0, batch, sizeof(batch));
+
+	do_or_die(exec(fd, MAX_NUM_EXEC, 0, USE_LUT));
+
+	for (p = pass; p->name != NULL; p++) {
+		for (n = 1; n <= MAX_NUM_EXEC; n *= 2) {
+			for (m = 1; m <= MAX_NUM_RELOC; m *= 2) {
+				struct timeval start, end;
+				double elapsed[2];
+
+				gettimeofday(&start, NULL);
+				for (count = 0; count < 1000; count++)
+					do_or_die(exec(fd, n, m, 0 | p->flags));
+				gettimeofday(&end, NULL);
+				gem_sync(fd, gem_exec[MAX_NUM_EXEC].handle);
+				elapsed[0] = ELAPSED(&start, &end) / 1000.;
+
+				gettimeofday(&start, NULL);
+				for (count = 0; count < 1000; count++)
+					do_or_die(exec(fd, n, m, USE_LUT | p->flags));
+				gettimeofday(&end, NULL);
+				gem_sync(fd, gem_exec[MAX_NUM_EXEC].handle);
+				elapsed[1] = ELAPSED(&start, &end) / 1000.;
+
+				printf("%s: buffer_count=%d, reloc_count=%d: old=%f us, lut=%f us\n",
+				       p->name, n, m, elapsed[0], elapsed[1]);
+			}
+		}
+	}
+
+	return 0;
+}
-- 
1.7.10.4

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Re: [PATCH 2/2] tests: Benchmark new API for using a LUT with the execbuffer

[Ben Widawsky]

On Wed,  5 Dec 2012 14:02:22 +0000
Chris Wilson <chris@chris-wilson.co.uk> wrote:

> +++ b/tests/gem_exec_lut_handle.c
> @@ -0,0 +1,175 @@
> +/*
> + * Copyright © 20012 Intel Corporation
> + *

whaaa! That's like after the extinction of the human race. (you made
the same typo on both patches).

Re: [PATCH 1/2] tests: Exercise new API for using a LUT with the execbuffer

[Daniel Vetter]

On Wed, Dec 05, 2012 at 02:02:21PM +0000, Chris Wilson wrote:
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>  tests/Makefile.am      |    1 +
>  tests/gem_lut_handle.c |  109 ++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 110 insertions(+)
>  create mode 100644 tests/gem_lut_handle.c
> 
> diff --git a/tests/Makefile.am b/tests/Makefile.am
> index 18f7148..16d187f 100644
> --- a/tests/Makefile.am
> +++ b/tests/Makefile.am
> @@ -37,6 +37,7 @@ TESTS_progs = \
>  	gem_exec_blt \
>  	gem_exec_faulting_reloc \
>  	gem_readwrite \
> +	gem_lut_handle \
>  	gem_mmap \
>  	gem_mmap_offset_exhaustion \
>  	gem_hangcheck_forcewake \
> diff --git a/tests/gem_lut_handle.c b/tests/gem_lut_handle.c
> new file mode 100644
> index 0000000..64676f2
> --- /dev/null
> +++ b/tests/gem_lut_handle.c
> @@ -0,0 +1,109 @@
> +/*
> + * Copyright © 20012 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:
> + *    Chris Wilson <chris@chris-wilson.co.uk>
> + *
> + */
> +
> +/* Exercises the basic execbuffer using theh andle LUT interface */
> +
> +#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"
> +
> +#define MI_BATCH_BUFFER_END	(0xA<<23)
> +#define BATCH_SIZE		(1024*1024)
> +
> +#define LOCAL_I915_EXEC_HANDLE_LUT (1<<11)
> +
> +#define USE_LUT 0x1
> +#define BROKEN 0x2
> +
> +static int exec(int fd, uint32_t handle, unsigned int flags)
> +{
> +	struct drm_i915_gem_execbuffer2 execbuf;
> +	struct drm_i915_gem_exec_object2 gem_exec[1];
> +	struct drm_i915_gem_relocation_entry gem_reloc[1];
> +
> +	gem_reloc[0].offset = 1024;
> +	gem_reloc[0].delta = 0;
> +	gem_reloc[0].target_handle =
> +		!!(flags & USE_LUT) ^ !!(flags & BROKEN) ? 0 : handle;

For added fun, can you pls add a few more USE_LUT cases with funny indexes
like -1, num_exec_bos, num_exec_bos + 1?
-Daniel

> +	gem_reloc[0].read_domains = I915_GEM_DOMAIN_RENDER;
> +	gem_reloc[0].write_domain = 0;
> +	gem_reloc[0].presumed_offset = 0;
> +
> +	gem_exec[0].handle = handle;
> +	gem_exec[0].relocation_count = 1;
> +	gem_exec[0].relocs_ptr = (uintptr_t) gem_reloc;
> +	gem_exec[0].alignment = 0;
> +	gem_exec[0].offset = 0;
> +	gem_exec[0].flags = 0;
> +	gem_exec[0].rsvd1 = 0;
> +	gem_exec[0].rsvd2 = 0;
> +
> +	execbuf.buffers_ptr = (uintptr_t)gem_exec;
> +	execbuf.buffer_count = 1;
> +	execbuf.batch_start_offset = 0;
> +	execbuf.batch_len = 8;
> +	execbuf.cliprects_ptr = 0;
> +	execbuf.num_cliprects = 0;
> +	execbuf.DR1 = 0;
> +	execbuf.DR4 = 0;
> +	execbuf.flags = flags & USE_LUT ? LOCAL_I915_EXEC_HANDLE_LUT : 0;
> +	i915_execbuffer2_set_context_id(execbuf, 0);
> +	execbuf.rsvd2 = 0;
> +
> +	return drmIoctl(fd,
> +			DRM_IOCTL_I915_GEM_EXECBUFFER2,
> +			&execbuf);
> +}
> +
> +int main(int argc, char **argv)
> +{
> +	uint32_t batch[2] = {MI_BATCH_BUFFER_END};
> +	uint32_t handle;
> +	int fd;
> +
> +	fd = drm_open_any();
> +
> +	handle = gem_create(fd, 4096);
> +	gem_write(fd, handle, 0, batch, sizeof(batch));
> +
> +	do_or_die(exec(fd, handle, 0));
> +	do_or_die(exec(fd, handle, USE_LUT));
> +
> +	assert(exec(fd, handle, BROKEN) == -1 && errno == ENOENT);
> +	assert(exec(fd, handle, USE_LUT | BROKEN) == -1 && errno == ENOENT);
> +
> +	return 0;
> +}
> -- 
> 1.7.10.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [PATCH 1/2] tests: Exercise new API for using a LUT with the execbuffer

[Daniel Vetter]

On Wed, Jan 16, 2013 at 04:42:35PM +0100, Daniel Vetter wrote:
> On Wed, Dec 05, 2012 at 02:02:21PM +0000, Chris Wilson wrote:
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > ---
> >  tests/Makefile.am      |    1 +
> >  tests/gem_lut_handle.c |  109 ++++++++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 110 insertions(+)
> >  create mode 100644 tests/gem_lut_handle.c
> > 
> > diff --git a/tests/Makefile.am b/tests/Makefile.am
> > index 18f7148..16d187f 100644
> > --- a/tests/Makefile.am
> > +++ b/tests/Makefile.am
> > @@ -37,6 +37,7 @@ TESTS_progs = \
> >  	gem_exec_blt \
> >  	gem_exec_faulting_reloc \
> >  	gem_readwrite \
> > +	gem_lut_handle \
> >  	gem_mmap \
> >  	gem_mmap_offset_exhaustion \
> >  	gem_hangcheck_forcewake \
> > diff --git a/tests/gem_lut_handle.c b/tests/gem_lut_handle.c
> > new file mode 100644
> > index 0000000..64676f2
> > --- /dev/null
> > +++ b/tests/gem_lut_handle.c
> > @@ -0,0 +1,109 @@
> > +/*
> > + * Copyright © 20012 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:
> > + *    Chris Wilson <chris@chris-wilson.co.uk>
> > + *
> > + */
> > +
> > +/* Exercises the basic execbuffer using theh andle LUT interface */
> > +
> > +#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"
> > +
> > +#define MI_BATCH_BUFFER_END	(0xA<<23)
> > +#define BATCH_SIZE		(1024*1024)
> > +
> > +#define LOCAL_I915_EXEC_HANDLE_LUT (1<<11)
> > +
> > +#define USE_LUT 0x1
> > +#define BROKEN 0x2
> > +
> > +static int exec(int fd, uint32_t handle, unsigned int flags)
> > +{
> > +	struct drm_i915_gem_execbuffer2 execbuf;
> > +	struct drm_i915_gem_exec_object2 gem_exec[1];
> > +	struct drm_i915_gem_relocation_entry gem_reloc[1];
> > +
> > +	gem_reloc[0].offset = 1024;
> > +	gem_reloc[0].delta = 0;
> > +	gem_reloc[0].target_handle =
> > +		!!(flags & USE_LUT) ^ !!(flags & BROKEN) ? 0 : handle;
> 
> For added fun, can you pls add a few more USE_LUT cases with funny indexes
> like -1, num_exec_bos, num_exec_bos + 1?

Even more fun: scale the relocs and exec_bufs array a bit - 2**k {-1, +0,
+1} seem to be favourites for blowing things up ...
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch