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drm/i915/userptr: Make gup errors stickier

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Keep any error reported by the gup_worker until we are notified that the
arena has changed (via the mmu-notifier). This has the importance of
making two consecutive calls to i915_gem_object_get_pages() reporting
the same error, and curtailing a loop of detecting a fault and requeueing
a gup_worker.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-19-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-08-18 17:16:58 +01:00
parent c58b735fc7
commit 364c8172ed
1 changed files with 7 additions and 10 deletions
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17
drivers/gpu/drm/i915/i915_gem_userptr.c
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@ -542,8 +542,6 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
}
}
obj->userptr.work = ERR_PTR(ret);
if (ret)
__i915_gem_userptr_set_active(obj, false);
}
obj->userptr.workers--;
@ -628,15 +626,14 @@ i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
* to the vma (discard or cloning) which should prevent the more
* egregious cases from causing harm.
*/
if (IS_ERR(obj->userptr.work)) {
/* active flag will have been dropped already by the worker */
ret = PTR_ERR(obj->userptr.work);
obj->userptr.work = NULL;
return ret;
}
if (obj->userptr.work)
if (obj->userptr.work) {
/* active flag should still be held for the pending work */
return -EAGAIN;
if (IS_ERR(obj->userptr.work))
return PTR_ERR(obj->userptr.work);
else
return -EAGAIN;
}
/* Let the mmu-notifier know that we have begun and need cancellation */
ret = __i915_gem_userptr_set_active(obj, true);