On 12/15/2017 4:22 PM, Chris Wilson wrote:
At the beginning of a reset, we disable the submission method and find
the stuck request. We expect to find a stuck request for we have
declared the engine stalled. However, if we find no active request, the
engine must have recovered from its stall before we could issue a reset,
so let the engine continue on without a reset. If the engine is truly
stuck, we will back soon enough with the next reset attempt.
v2: Remove the stale debug message.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
Reviewed-by: Michel Thierry <michel.thierry@xxxxxxxxx>
drivers/gpu/drm/i915/i915_drv.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index ca9f4b2862eb..6d39fdf2b604 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2011,19 +2011,19 @@ int i915_reset_engine(struct intel_engine_cs *engine, unsigned int flags)
GEM_BUG_ON(!test_bit(I915_RESET_ENGINE + engine->id, &error->flags));
+ active_request = i915_gem_reset_prepare_engine(engine);
+ if (IS_ERR_OR_NULL(active_request)) {
+ /* Either the previous reset failed, or we pardon the reset. */
+ ret = PTR_ERR(active_request);
+ goto out;
+ }
+
if (!(flags & I915_RESET_QUIET)) {
dev_notice(engine->i915->drm.dev,
"Resetting %s after gpu hang\n", engine->name);
}
error->reset_engine_count[engine->id]++;
- active_request = i915_gem_reset_prepare_engine(engine);
- if (IS_ERR(active_request)) {
- DRM_DEBUG_DRIVER("Previous reset failed, promote to full reset\n");
- ret = PTR_ERR(active_request);
- goto out;
- }
-
if (!engine->i915->guc.execbuf_client)
ret = intel_gt_reset_engine(engine->i915, engine);
else
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