[Intel-gfx] [RFC i-g-t v5] tests/gem_exec_pad_to_size: Test object padding at execbuf
Thomas Wood
thomas.wood at intel.com
Thu Apr 2 09:09:43 PDT 2015
On 2 April 2015 at 13:54, Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com> wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>
> This tests the new EXEC_OBJECT_PAD_TO_SIZE exec_object2 flag.
Just two things from an i-g-t perspective: the new binary needs adding
to .gitignore and it would be good to include a short description of
the test using the IGT_TEST_DESCRIPTION macro.
>
> Similar to some other tests, it uses knowledge of the DRM
> allocation policy in order to get two objects mapped adjacent
> to each other. It is then possible to verify that the pad to
> size flag will move them apart.
>
> v2: Correct commit message. (Chris Wilson)
> v3: Changes after code review by Chris Wilson.
> * No need for gem_sync after execbuf.
> * Drop caches before running.
> * Allocate one additional bo per iteration.
> * Don't explicitly set unused execbuf fields to zero.
> * One improved comment.
> v4: Require simpler object ordering and fixed overlap test. (Chris Wilson)
> v5: Check unpadded offsets once more before padding. (Chris Wilson)
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> ---
> tests/Makefile.sources | 1 +
> tests/gem_exec_pad_to_size.c | 240 +++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 241 insertions(+)
> create mode 100644 tests/gem_exec_pad_to_size.c
>
> diff --git a/tests/Makefile.sources b/tests/Makefile.sources
> index 0a974a6..5f21728 100644
> --- a/tests/Makefile.sources
> +++ b/tests/Makefile.sources
> @@ -34,6 +34,7 @@ TESTS_progs_M = \
> gem_exec_bad_domains \
> gem_exec_faulting_reloc \
> gem_exec_nop \
> + gem_exec_pad_to_size \
> gem_exec_params \
> gem_exec_parse \
> gem_fenced_exec_thrash \
> diff --git a/tests/gem_exec_pad_to_size.c b/tests/gem_exec_pad_to_size.c
> new file mode 100644
> index 0000000..87afe40
> --- /dev/null
> +++ b/tests/gem_exec_pad_to_size.c
> @@ -0,0 +1,240 @@
> +/*
> + * Copyright © 2015 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:
> + * Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> + *
> + */
> +
> +#include <unistd.h>
> +#include <stdlib.h>
> +#include <stdint.h>
> +#include <stdio.h>
> +#include <string.h>
> +#include <fcntl.h>
> +#include <inttypes.h>
> +#include <errno.h>
> +#include <sys/stat.h>
> +#include <sys/ioctl.h>
> +#include <sys/time.h>
> +#include "drm.h"
> +#include "ioctl_wrappers.h"
> +#include "igt_core.h"
> +#include "drmtest.h"
> +#include "intel_reg.h"
> +#include "igt_debugfs.h"
> +
> +#ifndef PAGE_SIZE
> +#define PAGE_SIZE 4096
> +#endif
> +
> +struct local_drm_i915_gem_exec_object2 {
> + /**
> + * User's handle for a buffer to be bound into the GTT for this
> + * operation.
> + */
> + __u32 handle;
> +
> + /** Number of relocations to be performed on this buffer */
> + __u32 relocation_count;
> + /**
> + * Pointer to array of struct drm_i915_gem_relocation_entry containing
> + * the relocations to be performed in this buffer.
> + */
> + __u64 relocs_ptr;
> +
> + /** Required alignment in graphics aperture */
> + __u64 alignment;
> +
> + /**
> + * Returned value of the updated offset of the object, for future
> + * presumed_offset writes.
> + */
> + __u64 offset;
> +
> +#define LOCAL_EXEC_OBJECT_NEEDS_FENCE (1<<0)
> +#define LOCAL_EXEC_OBJECT_NEEDS_GTT (1<<1)
> +#define LOCAL_EXEC_OBJECT_WRITE (1<<2)
> +#define LOCAL_EXEC_OBJECT_PAD_TO_SIZE (1<<3)
> +#define __LOCAL_EXEC_OBJECT_UNKNOWN_FLAGS -(LOCAL_EXEC_OBJECT_PAD_TO_SIZE<<1)
> + __u64 flags;
> +
> + __u64 pad_to_size;
> + __u64 rsvd2;
> +};
> +
> +static int
> +exec(int fd, uint32_t handles[3], uint32_t pad_to_size[2], uint64_t *offsets)
> +{
> + struct drm_i915_gem_execbuffer2 execbuf;
> + struct local_drm_i915_gem_exec_object2 gem_exec[3];
> + int ret = 0;
> +
> + memset(gem_exec, 0, sizeof(gem_exec));
> +
> + gem_exec[0].handle = handles[1];
> + gem_exec[0].flags = pad_to_size[0] ?
> + LOCAL_EXEC_OBJECT_PAD_TO_SIZE : 0;
> + gem_exec[0].pad_to_size = pad_to_size[0];
> +
> + gem_exec[1].handle = handles[2];
> + gem_exec[1].flags = pad_to_size[1] ?
> + LOCAL_EXEC_OBJECT_PAD_TO_SIZE : 0;
> + gem_exec[1].pad_to_size = pad_to_size[1];
> +
> + gem_exec[2].handle = handles[0];
> +
> + memset(&execbuf, 0, sizeof(execbuf));
> +
> + execbuf.buffers_ptr = (uintptr_t)gem_exec;
> + execbuf.buffer_count = 3;
> + execbuf.batch_len = 8;
> +
> + if (drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf))
> + ret = -errno;
> +
> + if (ret == 0 && offsets) {
> + offsets[0] = gem_exec[0].offset;
> + offsets[1] = gem_exec[1].offset;
> + }
> +
> + return ret;
> +}
> +
> +static void
> +require_pad_to_size(int fd, uint32_t handles[3])
> +{
> + igt_require(exec(fd, handles, (uint32_t[2]){ PAGE_SIZE, PAGE_SIZE },
> + NULL) == 0);
> +}
> +
> +static void
> +not_aligned(int fd, uint32_t handles[3])
> +{
> + require_pad_to_size(fd, handles);
> +
> + igt_require(exec(fd, handles, (uint32_t[2]){1 ,1},
> + NULL) == -EINVAL);
> +}
> +
> +static void
> +padding(int fd, uint32_t handles[3])
> +{
> + uint32_t pad_to_size[2] = {0, 0};
> + uint64_t offsets[2];
> + bool neighbours = false;
> + unsigned int try, i;
> + const unsigned int max_tries = 4096; /* Finger in the air. */
> + uint32_t *loc_handles;
> + uint32_t eb_handles[3];
> +
> + require_pad_to_size(fd, handles);
> +
> + igt_drop_caches_set(DROP_ALL);
> +
> + loc_handles = calloc(max_tries * 2, sizeof(uint32_t));
> + igt_assert(loc_handles);
> +
> + /* Try with passed in handles first. */
> + loc_handles[0] = handles[1];
> + loc_handles[1] = handles[2];
> +
> + /* Try to get two buffer object next to each other in GTT space.
> + * We presume that sequential reservations are likely to be aligned and
> + * try until we find a pair that is.
> + */
> + for (try = 0; try < max_tries;) {
> + eb_handles[0] = handles[0];
> + eb_handles[1] = loc_handles[try];
> + eb_handles[2] = loc_handles[try + 1];
> +
> + igt_assert(exec(fd, eb_handles, (uint32_t[2]){0, 0},
> + offsets) == 0);
> +
> + if ((offsets[1] - offsets[0]) == PAGE_SIZE) {
> + neighbours = true;
> + break;
> + }
> +
> + try++;
> +
> + loc_handles[try + 1] = gem_create(fd, PAGE_SIZE);
> + igt_assert(loc_handles[try + 1]);
> + }
> +
> + /* Otherwise test can't confidently run. */
> + if (neighbours) {
> + /* Check the object don't move by themselves */
> + igt_assert(exec(fd, eb_handles, pad_to_size, offsets) == 0);
> + igt_assert((offsets[1] - offsets[0]) == PAGE_SIZE);
> +
> + /* Re-exec with padding set. */
> + pad_to_size[0] = 2 * PAGE_SIZE;
> + igt_assert(exec(fd, eb_handles, pad_to_size, offsets) == 0);
> +
> + /* Check that objects with padding do not overlap. */
> + igt_assert(offsets[0] >= offsets[1] + PAGE_SIZE ||
> + offsets[0] + 2 * PAGE_SIZE <= offsets[1]);
> + }
> +
> + /* Cleanup our bos. */
> + for (i = 0; i < try; i++)
> + gem_close(fd, loc_handles[2 + i]);
> +
> + free(loc_handles);
> +
> + igt_require(neighbours);
> +}
> +
> +uint32_t batch[2] = {MI_BATCH_BUFFER_END};
> +uint32_t handles[3];
> +int fd;
> +
> +igt_main
> +{
> + igt_fixture {
> + fd = drm_open_any();
> +
> + handles[0] = gem_create(fd, PAGE_SIZE);
> + gem_write(fd, handles[0], 0, batch, sizeof(batch));
> +
> + handles[1] = gem_create(fd, PAGE_SIZE);
> + handles[2] = gem_create(fd, PAGE_SIZE);
> + }
> +
> + igt_subtest("pad_to_size")
> + require_pad_to_size(fd, handles);
> +
> + igt_subtest("not_aligned")
> + not_aligned(fd, handles);
> +
> + igt_subtest("padding")
> + padding(fd, handles);
> +
> + igt_fixture {
> + gem_close(fd, handles[0]);
> + gem_close(fd, handles[1]);
> + gem_close(fd, handles[2]);
> +
> + close(fd);
> + }
> +}
> --
> 2.3.2
>
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