Re: [Intel-gfx] [PATCH v3 1/4] drm/i915/uc: Use correct error code for GuC initialization failure
On 3/13/2018 7:24 PM, Michal Wajdeczko wrote:
Since commit 6ca9a2beb54a ("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 121981fafe69 ("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.
v2: don't allow -EIO from uc_init
don't call uc_fini[_misc] on -EIO
mark guc fw as failed on hw init failure
prepare uc_fini_hw to run after earlier -EIO
v3: update comments (Sagar)
use sanitize functions on failure in init_hw (Michal)
and also sanitize guc/huc fw in fini_hw (Michal)
Signed-off-by: Michal Wajdeczko
Cc: Chris Wilson
Cc: Michal Winiarski
Cc: Daniele Ceraolo Spurio
Cc: Sagar Arun Kamble
---
drivers/gpu/drm/i915/i915_gem.c| 17 ++---
drivers/gpu/drm/i915/intel_guc.h | 5 +
drivers/gpu/drm/i915/intel_uc.c| 18 ++
drivers/gpu/drm/i915/intel_uc_fw.h | 5 +
4 files changed, 34 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 05b0724..8eed87d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5338,8 +5338,10 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
intel_init_gt_powersave(dev_priv);
ret = intel_uc_init(dev_priv);
- if (ret)
+ if (ret) {
+ GEM_BUG_ON(ret == -EIO);
goto err_pm;
+ }
ret = i915_gem_init_hw(dev_priv);
if (ret)
@@ -5386,7 +5388,8 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
i915_gem_contexts_lost(dev_priv);
intel_uc_fini_hw(dev_priv);
err_uc_init:
- intel_uc_fini(dev_priv);
+ if (ret != -EIO)
+ intel_uc_fini(dev_priv);
err_pm:
if (ret != -EIO) {
intel_cleanup_gt_powersave(dev_priv);
@@ -5400,15 +5403,15 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
mutex_unlock(_priv->drm.struct_mutex);
- intel_uc_fini_misc(dev_priv);
-
- if (ret != -EIO)
+ if (ret != -EIO) {
+ intel_uc_fini_misc(dev_priv);
i915_gem_cleanup_userptr(dev_priv);
+ }
if (ret == -EIO) {
/*
-* Allow engine initialisation to fail by marking the GPU as
-* wedged. But we only want to do this where the GPU is angry,
+* Allow engines or uC initialization to fail by marking the GPU
+* as wedged. But we only want to do this when the GPU is angry,
* for all other failure, such as an allocation failure, bail.
*/
if (!i915_terminally_wedged(_priv->gpu_error)) {
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index d878160..faa9e01 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -139,4 +139,9 @@ static inline int intel_guc_sanitize(struct intel_guc *guc)
return 0;
}
+static inline bool intel_guc_is_loaded(struct intel_guc *guc)
+{
+ return intel_uc_fw_is_loaded(>fw);
+}
+
#endif
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 9d5ffd7..f89acf4 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -447,15 +447,20 @@ 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;
+
+ /* Sanitize GuC/HuC to avoid clean-up on wedged */
+ intel_huc_sanitize(huc);
+ intel_guc_sanitize(guc);
+ GEM_BUG_ON(intel_guc_is_loaded(guc));
+
How about also resetting the hw using __intel_uc_reset_hw().
+ /* We want to disable GPU submission but keep KMS alive */
+ return -EIO;
}
void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
{
+ struct intel_huc *huc = _priv->huc;
struct intel_guc *guc = _priv->guc;
if (!USES_GUC(dev_priv))
@@ -463,10 +468,15 @@ void intel_uc_fini_hw(struct drm_i915_private
[Intel-gfx] [PATCH v3 1/4] drm/i915/uc: Use correct error code for GuC initialization failure
Since commit 6ca9a2beb54a ("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 121981fafe69 ("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.
v2: don't allow -EIO from uc_init
don't call uc_fini[_misc] on -EIO
mark guc fw as failed on hw init failure
prepare uc_fini_hw to run after earlier -EIO
v3: update comments (Sagar)
use sanitize functions on failure in init_hw (Michal)
and also sanitize guc/huc fw in fini_hw (Michal)
Signed-off-by: Michal Wajdeczko
Cc: Chris Wilson
Cc: Michal Winiarski
Cc: Daniele Ceraolo Spurio
Cc: Sagar Arun Kamble
---
drivers/gpu/drm/i915/i915_gem.c| 17 ++---
drivers/gpu/drm/i915/intel_guc.h | 5 +
drivers/gpu/drm/i915/intel_uc.c| 18 ++
drivers/gpu/drm/i915/intel_uc_fw.h | 5 +
4 files changed, 34 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 05b0724..8eed87d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5338,8 +5338,10 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
intel_init_gt_powersave(dev_priv);
ret = intel_uc_init(dev_priv);
- if (ret)
+ if (ret) {
+ GEM_BUG_ON(ret == -EIO);
goto err_pm;
+ }
ret = i915_gem_init_hw(dev_priv);
if (ret)
@@ -5386,7 +5388,8 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
i915_gem_contexts_lost(dev_priv);
intel_uc_fini_hw(dev_priv);
err_uc_init:
- intel_uc_fini(dev_priv);
+ if (ret != -EIO)
+ intel_uc_fini(dev_priv);
err_pm:
if (ret != -EIO) {
intel_cleanup_gt_powersave(dev_priv);
@@ -5400,15 +5403,15 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
mutex_unlock(_priv->drm.struct_mutex);
- intel_uc_fini_misc(dev_priv);
-
- if (ret != -EIO)
+ if (ret != -EIO) {
+ intel_uc_fini_misc(dev_priv);
i915_gem_cleanup_userptr(dev_priv);
+ }
if (ret == -EIO) {
/*
-* Allow engine initialisation to fail by marking the GPU as
-* wedged. But we only want to do this where the GPU is angry,
+* Allow engines or uC initialization to fail by marking the GPU
+* as wedged. But we only want to do this when the GPU is angry,
* for all other failure, such as an allocation failure, bail.
*/
if (!i915_terminally_wedged(_priv->gpu_error)) {
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index d878160..faa9e01 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -139,4 +139,9 @@ static inline int intel_guc_sanitize(struct intel_guc *guc)
return 0;
}
+static inline bool intel_guc_is_loaded(struct intel_guc *guc)
+{
+ return intel_uc_fw_is_loaded(>fw);
+}
+
#endif
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 9d5ffd7..f89acf4 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -447,15 +447,20 @@ 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;
+
+ /* Sanitize GuC/HuC to avoid clean-up on wedged */
+ intel_huc_sanitize(huc);
+ intel_guc_sanitize(guc);
+ GEM_BUG_ON(intel_guc_is_loaded(guc));
+
+ /* We want to disable GPU submission but keep KMS alive */
+ return -EIO;
}
void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
{
+ struct intel_huc *huc = _priv->huc;
struct intel_guc *guc = _priv->guc;
if (!USES_GUC(dev_priv))
@@ -463,10 +468,15 @@ void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
GEM_BUG_ON(!HAS_GUC(dev_priv));
+ if (!intel_guc_is_loaded(guc))
+ return;
+
