Chris Wilson <ch...@chris-wilson.co.uk> writes:
> We require that the intel_gpu_reset() was atomic, not the whole of
> i915_reset() which is guarded by a mutex. However, we do require that
> i915_reset_engine() is atomic for use from within the submission tasklet.
>
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> ---
> drivers/gpu/drm/i915/gt/selftest_reset.c | 65 +++++++++++++++++++++++-
> 1 file changed, 63 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/selftest_reset.c
> b/drivers/gpu/drm/i915/gt/selftest_reset.c
> index 64c2c8ab64ec..641cf3aee8d5 100644
> --- a/drivers/gpu/drm/i915/gt/selftest_reset.c
> +++ b/drivers/gpu/drm/i915/gt/selftest_reset.c
> @@ -73,11 +73,13 @@ static int igt_atomic_reset(void *arg)
> for (p = igt_atomic_phases; p->name; p++) {
> GEM_TRACE("intel_gpu_reset under %s\n", p->name);
>
> - p->critical_section_begin();
> reset_prepare(i915);
> + p->critical_section_begin();
> +
> err = intel_gpu_reset(i915, ALL_ENGINES);
> - reset_finish(i915);
> +
> p->critical_section_end();
> + reset_finish(i915);
>
> if (err) {
> pr_err("intel_gpu_reset failed under %s\n", p->name);
> @@ -95,12 +97,71 @@ static int igt_atomic_reset(void *arg)
> return err;
> }
>
> +static int igt_atomic_engine_reset(void *arg)
> +{
> + struct drm_i915_private *i915 = arg;
> + const typeof(*igt_atomic_phases) *p;
I did admire the nastyness of this array.
> + struct intel_engine_cs *engine;
> + enum intel_engine_id id;
> + int err = 0;
> +
> + /* Check that the resets are usable from atomic context */
> +
> + if (!intel_has_reset_engine(i915))
> + return 0;
> +
> + if (USES_GUC_SUBMISSION(i915))
> + return 0;
> +
> + intel_gt_pm_get(&i915->gt);
> + igt_global_reset_lock(i915);
> +
> + /* Flush any requests before we get started and check basics */
> + if (!igt_force_reset(i915))
> + goto out_unlock;
I would still go out with error if the prerequisites
are not met?
-Mika
> +
> + for_each_engine(engine, i915, id) {
> + tasklet_disable_nosync(&engine->execlists.tasklet);
> + intel_engine_pm_get(engine);
> +
> + for (p = igt_atomic_phases; p->name; p++) {
> + GEM_TRACE("i915_reset_engine(%s) under %s\n",
> + engine->name, p->name);
> +
> + p->critical_section_begin();
> + err = i915_reset_engine(engine, NULL);
> + p->critical_section_end();
> +
> + if (err) {
> + pr_err("i915_reset_engine(%s) failed under
> %s\n",
> + engine->name, p->name);
> + break;
> + }
> + }
> +
> + intel_engine_pm_put(engine);
> + tasklet_enable(&engine->execlists.tasklet);
> + if (err)
> + break;
> + }
> +
> + /* As we poke around the guts, do a full reset before continuing. */
> + igt_force_reset(i915);
> +
> +out_unlock:
> + igt_global_reset_unlock(i915);
> + intel_gt_pm_put(&i915->gt);
> +
> + return err;
> +}
> +
> int intel_reset_live_selftests(struct drm_i915_private *i915)
> {
> static const struct i915_subtest tests[] = {
> SUBTEST(igt_global_reset), /* attempt to recover GPU first */
> SUBTEST(igt_wedged_reset),
> SUBTEST(igt_atomic_reset),
> + SUBTEST(igt_atomic_engine_reset),
> };
> intel_wakeref_t wakeref;
> int err = 0;
> --
> 2.20.1
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