We currently require that our per-engine reset can be called from any
context, even hardirq, and in the future wish to perform the device
reset without holding struct_mutex (which requires some lockless
shenanigans that demand the lowlevel intel_reset_gpu() be able to be
used in atomic context). Test that we meet the current requirements by
calling i915_reset_engine() from under various atomic contexts.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
---
.../gpu/drm/i915/selftests/intel_hangcheck.c | 101 ++++++++++++++++++
1 file changed, 101 insertions(+)
diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
index 51d0e2bed9e1..df4c076c02ae 100644
--- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -1473,6 +1473,106 @@ static int igt_handle_error(void *arg)
return err;
}
+static void __preempt_begin(void)
+{
+ preempt_disable();
+}
+
+static void __preempt_end(void)
+{
+ preempt_enable();
+}
+
+static void __softirq_begin(void)
+{
+ local_bh_disable();
+}
+
+static void __softirq_end(void)
+{
+ local_bh_enable();
+}
+
+static void __hardirq_begin(void)
+{
+ local_irq_disable();
+}
+
+static void __hardirq_end(void)
+{
+ local_irq_enable();
+}
+
+static int igt_atomic_reset(void *arg)
+{
+ static const struct {
+ const char *name;
+ void (*critical_section_begin)(void);
+ void (*critical_section_end)(void);
+ } phases[] = {
+ { "preempt", __preempt_begin, __preempt_end },
+ { "softirq", __softirq_begin, __softirq_end },
+ { "hardirq", __hardirq_begin, __hardirq_end },
+ { }
+ };
+ struct drm_i915_private *i915 = arg;
+ int err = 0;
+
+ /* Check that the resets are usable from atomic context */
+
+ if (USES_GUC_SUBMISSION(i915))
+ return 0; /* guc is dead; long live the guc */
+
+ global_reset_lock(i915);
+ mutex_lock(&i915->drm.struct_mutex);
+
+ /* Flush any requests before we get started and check basics */
+ i915_gem_set_wedged(i915);
+ i915_reset(i915, 0, NULL);
+ if (i915_terminally_wedged(&i915->gpu_error))
+ goto out;
+
+ if (intel_has_reset_engine(i915)) {
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ for_each_engine(engine, i915, id) {
+ struct tasklet_struct * const t =
+ &engine->execlists.tasklet;
+ const typeof(*phases) *p;
+
+ for (p = phases; p->name; p++) {
+ GEM_TRACE("i915_reset_engine(%s) under %s\n",
+ engine->name, p->name);
+
+ tasklet_disable_nosync(t);
+ p->critical_section_begin();
+
+ err = i915_reset_engine(engine, NULL);
+
+ p->critical_section_end();
+ tasklet_enable(t);
+
+ if (err) {
+ pr_err("i915_reset_engine(%s) failed
under %s\n",
+ engine->name, p->name);
+ goto out;
+ }
+ }
+ }
+ }
+
+out:
+ /* As we poke around the guts, do a full reset before continuing. */
+ i915_gem_set_wedged(i915);
+ i915_reset(i915, 0, NULL);
+
+ mutex_unlock(&i915->drm.struct_mutex);
+ global_reset_unlock(i915);
+
+ return err;
+}
+
int intel_hangcheck_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
@@ -1487,6 +1587,7 @@ int intel_hangcheck_live_selftests(struct
drm_i915_private *i915)
SUBTEST(igt_reset_evict_ppgtt),
SUBTEST(igt_reset_evict_fence),
SUBTEST(igt_handle_error),
+ SUBTEST(igt_atomic_reset),
};
bool saved_hangcheck;
int err;
--
2.19.1
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