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drm/i915/selftest: Refactor reset locking

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Extract the common barrier against rogue hangchecks from disrupting our
direct testing of resets, and in the process expand the lock to include
the per-engine reset shortcuts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170721123238.16428-17-chris@chris-wilson.co.uk
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2017-07-21 13:32:35 +01:00 committed by Daniel Vetter
parent d1d1ebf412
commit 3744d49c6b
1 changed files with 43 additions and 15 deletions
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58
drivers/gpu/drm/i915/selftests/intel_hangcheck.c
View file

@ -297,6 +297,37 @@ unlock:
return err;
}
static void global_reset_lock(struct drm_i915_private *i915)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
while (test_and_set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags))
wait_event(i915->gpu_error.reset_queue,
!test_bit(I915_RESET_BACKOFF,
&i915->gpu_error.flags));
for_each_engine(engine, i915, id) {
while (test_and_set_bit(I915_RESET_ENGINE + id,
&i915->gpu_error.flags))
wait_on_bit(&i915->gpu_error.flags,
I915_RESET_ENGINE + id,
TASK_UNINTERRUPTIBLE);
}
}
static void global_reset_unlock(struct drm_i915_private *i915)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
for_each_engine(engine, i915, id)
clear_bit(I915_RESET_ENGINE + id, &i915->gpu_error.flags);
clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
wake_up_all(&i915->gpu_error.reset_queue);
}
static int igt_global_reset(void *arg)
{
struct drm_i915_private *i915 = arg;
@ -305,7 +336,7 @@ static int igt_global_reset(void *arg)
/* Check that we can issue a global GPU reset */
set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
global_reset_lock(i915);
set_bit(I915_RESET_HANDOFF, &i915->gpu_error.flags);
mutex_lock(&i915->drm.struct_mutex);
@ -320,8 +351,7 @@ static int igt_global_reset(void *arg)
mutex_unlock(&i915->drm.struct_mutex);
GEM_BUG_ON(test_bit(I915_RESET_HANDOFF, &i915->gpu_error.flags));
clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
wake_up_all(&i915->gpu_error.reset_queue);
global_reset_unlock(i915);
if (i915_terminally_wedged(&i915->gpu_error))
err = -EIO;
@ -571,7 +601,7 @@ static int igt_wait_reset(void *arg)
/* Check that we detect a stuck waiter and issue a reset */
set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
global_reset_lock(i915);
mutex_lock(&i915->drm.struct_mutex);
err = hang_init(&h, i915);
@ -616,8 +646,7 @@ fini:
hang_fini(&h);
unlock:
mutex_unlock(&i915->drm.struct_mutex);
clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
wake_up_all(&i915->gpu_error.reset_queue);
global_reset_unlock(i915);
if (i915_terminally_wedged(&i915->gpu_error))
return -EIO;
@ -638,7 +667,8 @@ static int igt_reset_queue(void *arg)
if (!igt_can_mi_store_dword_imm(i915))
return 0;
set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
global_reset_lock(i915);
mutex_lock(&i915->drm.struct_mutex);
err = hang_init(&h, i915);
if (err)
@ -732,8 +762,7 @@ fini:
hang_fini(&h);
unlock:
mutex_unlock(&i915->drm.struct_mutex);
clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
wake_up_all(&i915->gpu_error.reset_queue);
global_reset_unlock(i915);
if (i915_terminally_wedged(&i915->gpu_error))
return -EIO;
@ -755,7 +784,8 @@ static int igt_render_engine_reset_fallback(void *arg)
if (!intel_has_reset_engine(i915))
return 0;
set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
global_reset_lock(i915);
mutex_lock(&i915->drm.struct_mutex);
err = hang_init(&h, i915);
@ -785,8 +815,7 @@ static int igt_render_engine_reset_fallback(void *arg)
/* unlock since we'll call handle_error */
mutex_unlock(&i915->drm.struct_mutex);
clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
wake_up_all(&i915->gpu_error.reset_queue);
global_reset_unlock(i915);
i915_handle_error(i915, intel_engine_flag(engine), "live test");
@ -808,7 +837,7 @@ static int igt_render_engine_reset_fallback(void *arg)
* more full reset to re-enable the hw.
*/
if (i915_terminally_wedged(&i915->gpu_error)) {
set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
global_reset_lock(i915);
rq->fence.error = 0;
mutex_lock(&i915->drm.struct_mutex);
@ -829,8 +858,7 @@ out_rq:
i915_gem_request_put(rq);
hang_fini(&h);
out_backoff:
clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
wake_up_all(&i915->gpu_error.reset_queue);
global_reset_unlock(i915);
if (i915_terminally_wedged(&i915->gpu_error))
return -EIO;