From a8b66f2c2f3e03b70a5e72cb5034f8aff669bf34 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 5 Feb 2018 15:24:28 +0000 Subject: [PATCH] drm/i915/selftests: Flush old resets between engines When injecting rapid resets, we must be careful to at least wait for the previous reset to have taken effect and the engine restarted. If we perform a second reset before that has happened, we will notice that the engine hasn't recovered and declare it lost, wedging the device and failing. In practice, since we wait for each hanging batch to start before injecting the reset, this too-fast-reset condition can only be triggered when moving onto the next engine in the test, so we need only wait for the existing reset to complete before switching engines. v2: Wrap up the wait inside a safety net to bail out in case of angry hw. Signed-off-by: Chris Wilson Cc: Mika Kuoppala Cc: Michel Thierry Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20180205152431.12163-1-chris@chris-wilson.co.uk --- .../gpu/drm/i915/selftests/intel_hangcheck.c | 66 ++++++++++++++++++- 1 file changed, 63 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c index d1f91a533afa..a42c539c1efe 100644 --- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c +++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c @@ -244,6 +244,58 @@ static u32 hws_seqno(const struct hang *h, return READ_ONCE(h->seqno[rq->fence.context % (PAGE_SIZE/sizeof(u32))]); } +struct wedge_me { + struct delayed_work work; + struct drm_i915_private *i915; + const void *symbol; +}; + +static void wedge_me(struct work_struct *work) +{ + struct wedge_me *w = container_of(work, typeof(*w), work.work); + + pr_err("%pS timed out, cancelling all further testing.\n", + w->symbol); + i915_gem_set_wedged(w->i915); +} + +static void __init_wedge(struct wedge_me *w, + struct drm_i915_private *i915, + long timeout, + const void *symbol) +{ + w->i915 = i915; + w->symbol = symbol; + + INIT_DELAYED_WORK_ONSTACK(&w->work, wedge_me); + schedule_delayed_work(&w->work, timeout); +} + +static void __fini_wedge(struct wedge_me *w) +{ + cancel_delayed_work_sync(&w->work); + destroy_delayed_work_on_stack(&w->work); + w->i915 = NULL; +} + +#define wedge_on_timeout(W, DEV, TIMEOUT) \ + for (__init_wedge((W), (DEV), (TIMEOUT), __builtin_return_address(0)); \ + (W)->i915; \ + __fini_wedge((W))) + +static noinline int +flush_test(struct drm_i915_private *i915, unsigned int flags) +{ + struct wedge_me w; + + cond_resched(); + + wedge_on_timeout(&w, i915, HZ) + i915_gem_wait_for_idle(i915, flags); + + return i915_terminally_wedged(&i915->gpu_error) ? -EIO : 0; +} + static void hang_fini(struct hang *h) { *h->batch = MI_BATCH_BUFFER_END; @@ -255,7 +307,7 @@ static void hang_fini(struct hang *h) i915_gem_object_unpin_map(h->hws); i915_gem_object_put(h->hws); - i915_gem_wait_for_idle(h->i915, I915_WAIT_LOCKED); + flush_test(h->i915, I915_WAIT_LOCKED); } static bool wait_for_hang(struct hang *h, struct drm_i915_gem_request *rq) @@ -487,7 +539,9 @@ static int __igt_reset_engine(struct drm_i915_private *i915, bool active) if (err) break; - cond_resched(); + err = flush_test(i915, 0); + if (err) + break; } if (i915_terminally_wedged(&i915->gpu_error)) @@ -726,7 +780,9 @@ unwind: if (err) break; - cond_resched(); + err = flush_test(i915, 0); + if (err) + break; } if (i915_terminally_wedged(&i915->gpu_error)) @@ -952,6 +1008,10 @@ static int igt_reset_queue(void *arg) i915_gem_chipset_flush(i915); i915_gem_request_put(prev); + + err = flush_test(i915, I915_WAIT_LOCKED); + if (err) + break; } fini: -- 2.30.2