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drm/i915: Don't mix srcu tag and negative error codes

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While srcu may use an integer tag, it does not exclude potential error
codes and so may overlap with our own use of -EINTR. Use a separate
outparam to store the tag, and report the error code separately.

Fixes: 2caffbf117 ("drm/i915: Revoke mmaps and prevent access to fence registers across reset")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190912160834.30601-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-09-12 17:08:34 +01:00
parent e91c8a29b4
commit eebab60f22
3 changed files with 6 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/i915/gem/i915_gem_mman.c
View File

@ -245,11 +245,9 @@ vm_fault_t i915_gem_fault(struct vm_fault *vmf)
wakeref = intel_runtime_pm_get(rpm);
srcu = intel_gt_reset_trylock(ggtt->vm.gt);
if (srcu < 0) {
ret = srcu;
ret = intel_gt_reset_trylock(ggtt->vm.gt, &srcu);
if (ret)
goto err_rpm;
}
ret = i915_mutex_lock_interruptible(dev);
if (ret)

8
drivers/gpu/drm/i915/gt/intel_reset.c
View File

@ -1214,10 +1214,8 @@ out:
intel_runtime_pm_put(&gt->i915->runtime_pm, wakeref);
}
int intel_gt_reset_trylock(struct intel_gt *gt)
int intel_gt_reset_trylock(struct intel_gt *gt, int *srcu)
{
int srcu;
might_lock(&gt->reset.backoff_srcu);
might_sleep();
@ -1232,10 +1230,10 @@ int intel_gt_reset_trylock(struct intel_gt *gt)
rcu_read_lock();
}
srcu = srcu_read_lock(&gt->reset.backoff_srcu);
*srcu = srcu_read_lock(&gt->reset.backoff_srcu);
rcu_read_unlock();
return srcu;
return 0;
}
void intel_gt_reset_unlock(struct intel_gt *gt, int tag)

2
drivers/gpu/drm/i915/gt/intel_reset.h
View File

@ -38,7 +38,7 @@ int intel_engine_reset(struct intel_engine_cs *engine,
void __i915_request_reset(struct i915_request *rq, bool guilty);
int __must_check intel_gt_reset_trylock(struct intel_gt *gt);
int __must_check intel_gt_reset_trylock(struct intel_gt *gt, int *srcu);
void intel_gt_reset_unlock(struct intel_gt *gt, int tag);
void intel_gt_set_wedged(struct intel_gt *gt);