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kms_flip: Try to make hang_gpu() robust against hanging the GPU

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On a bad day, hanging the GPU may be terminal. Yet even if the GPU is
terminally wedged we expect modesetting (and pageflips) to continue.
That deserves to be a dedicated test, but in the meantime we should
strive to avoid falling over just because the code is not resilient.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-02-21 09:38:43 +00:00
parent 005d1dcc98
commit 3db29744f7
1 changed files with 44 additions and 53 deletions
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97
tests/kms_flip.c
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@ -658,42 +658,27 @@ static void set_y_tiling(struct test_output *o, int fb_idx)
drmFree(r);
}
static void exec_nop(int fd, uint32_t handle)
static void stop_rings(void)
{
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec[1];
uint32_t b[2] = {MI_BATCH_BUFFER_END};
static const char dfs_base[] = "/sys/kernel/debug/dri";
static const char dfs_entry[] = "i915_ring_stop";
static const char data[] = "0xf";
char fname[FILENAME_MAX];
int card_index = drm_get_card();
int fd;
gem_write(fd, handle, 0, b, sizeof(b));
snprintf(fname, FILENAME_MAX, "%s/%i/%s",
dfs_base, card_index, dfs_entry);
gem_exec[0].handle = handle;
gem_exec[0].relocation_count = 0;
gem_exec[0].relocs_ptr = 0;
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;
fd = open(fname, O_WRONLY);
igt_assert(fd >= 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 = I915_EXEC_RENDER;
i915_execbuffer2_set_context_id(execbuf, 0);
execbuf.rsvd2 = 0;
igt_assert(write(fd, data, sizeof(data)) == sizeof(data));
igt_assert(drmIoctl(fd,
DRM_IOCTL_I915_GEM_EXECBUFFER2,
&execbuf) == 0);
close(fd);
}
static void eat_error_state(struct test_output *o)
static void eat_error_state(void)
{
static const char dfs_base[] = "/sys/kernel/debug/dri";
static const char dfs_entry_error[] = "i915_error_state";
@ -732,24 +717,36 @@ static void eat_error_state(struct test_output *o)
close(fd);
}
static void hang_gpu(struct test_output *o)
static void unhang_gpu(int fd, uint32_t handle)
{
static const char dfs_base[] = "/sys/kernel/debug/dri";
static const char dfs_entry[] = "i915_ring_stop";
static const char data[] = "0xf";
char fname[FILENAME_MAX];
int card_index = drm_get_card();
int fd;
gem_sync(drm_fd, handle);
gem_close(drm_fd, handle);
eat_error_state();
}
snprintf(fname, FILENAME_MAX, "%s/%i/%s",
dfs_base, card_index, dfs_entry);
static uint32_t hang_gpu(int fd)
{
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec;
uint32_t b[2] = {MI_BATCH_BUFFER_END};
fd = open(fname, O_WRONLY);
igt_assert(fd >= 0);
stop_rings();
igt_assert(write(fd, data, sizeof(data)) == sizeof(data));
memset(&gem_exec, 0, sizeof(gem_exec));
gem_exec.handle = gem_create(fd, 4096);
gem_write(fd, gem_exec.handle, 0, b, sizeof(b));
close(fd);
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (uintptr_t)&gem_exec;
execbuf.buffer_count = 1;
execbuf.batch_len = sizeof(b);
if (drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf)) {
unhang_gpu(fd, gem_exec.handle);
gem_exec.handle = 0;
}
return gem_exec.handle;
}
static int set_mode(struct test_output *o, uint32_t fb, int x, int y)
@ -786,7 +783,7 @@ static unsigned int run_test_step(struct test_output *o)
bool do_vblank;
struct vblank_reply vbl_reply;
unsigned int target_seq;
uint32_t handle = 0; /* Suppress GCC warning */
uint32_t hang = 0; /* Suppress GCC warning */
target_seq = o->vblank_state.seq_step;
/* Absolute waits only works once we have a frame counter. */
@ -864,11 +861,8 @@ static unsigned int run_test_step(struct test_output *o)
igt_info("."); fflush(stdout);
if (do_flip && (o->flags & TEST_HANG)) {
handle = gem_create(drm_fd, 4096);
hang_gpu(o);
exec_nop(drm_fd, handle);
}
if (do_flip && (o->flags & TEST_HANG))
hang = hang_gpu(drm_fd);
if (do_flip)
do_or_die(do_page_flip(o, new_fb_id, !(o->flags & TEST_NOEVENT)));
@ -920,11 +914,8 @@ static unsigned int run_test_step(struct test_output *o)
if (do_flip && (o->flags & TEST_EINVAL) && !(o->flags & TEST_FB_BAD_TILING))
igt_assert(do_page_flip(o, new_fb_id, true) == expected_einval);
if (do_flip && (o->flags & TEST_HANG)) {
gem_sync(drm_fd, handle);
gem_close(drm_fd, handle);
eat_error_state(o);
}
if (hang)
unhang_gpu(drm_fd, hang);
return completed_events;
}