Since commit 6ca9a2beb5 ("drm/i915: Unwind i915_gem_init() failure")
we believed that we correctly handle all errors encountered during
GuC initialization, including special one that indicates request to
run driver with disabled GPU submission (-EIO).
Unfortunately since commit 121981fafe ("drm/i915/guc: Combine
enable_guc_loading|submission modparams") we stopped using that
error code to avoid unwanted fallback to execlist submission mode.
In result any GuC initialization failure was treated as non-recoverable
error leading to driver load abort, so we could not even read related
GuC error log to investigate cause of the problem.
Fix that by always returning -EIO on uC hardware related failure.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michal Winiarski <michal.winiarski@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_uc.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 3a13cbb..1547e16 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -432,11 +432,8 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
* Note that there is no fallback as either user explicitly asked for
* the GuC or driver default option was to run with the GuC enabled.
*/
- if (GEM_WARN_ON(ret == -EIO))
- ret = -EINVAL;
-
dev_err(dev_priv->drm.dev, "GuC initialization failed %d\n", ret);
- return ret;
+ return -EIO; /* We want to disable GPU submission but keep KMS alive */
}
void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
--
1.9.1
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