From c715089f49844260f1eeae8e3b55af9468ba1325 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 23 Sep 2009 00:43:56 +0100 Subject: drm/i915: Handle ERESTARTSYS during page fault During a page fault and rebinding the buffer there exists a window for a signal to arrive during the i915_wait_request() and trigger a ERESTARTSYS. This used to be handled by returning SIGBUS and thereby killing the application. Try 'cairo-perf-trace & cairo-test-suite' and watch X go boom! The solution as suggested by H. Peter Anvin is to simply return NOPAGE and leave the higher layers to spot we did not fill the page and resubmit the page fault. Signed-off-by: Chris Wilson Cc: stable@kernel.org [anholt: Mostly squash it with another commit] --- drivers/gpu/drm/i915/i915_gem.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 4755ba41bfef..6129b7b4f1a5 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1200,26 +1200,21 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) mutex_lock(&dev->struct_mutex); if (!obj_priv->gtt_space) { ret = i915_gem_object_bind_to_gtt(obj, 0); - if (ret) { - mutex_unlock(&dev->struct_mutex); - return VM_FAULT_SIGBUS; - } + if (ret) + goto unlock; + list_add_tail(&obj_priv->list, &dev_priv->mm.inactive_list); ret = i915_gem_object_set_to_gtt_domain(obj, write); - if (ret) { - mutex_unlock(&dev->struct_mutex); - return VM_FAULT_SIGBUS; - } + if (ret) + goto unlock; } /* Need a new fence register? */ if (obj_priv->tiling_mode != I915_TILING_NONE) { ret = i915_gem_object_get_fence_reg(obj); - if (ret) { - mutex_unlock(&dev->struct_mutex); - return VM_FAULT_SIGBUS; - } + if (ret) + goto unlock; } pfn = ((dev->agp->base + obj_priv->gtt_offset) >> PAGE_SHIFT) + @@ -1227,18 +1222,18 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) /* Finally, remap it using the new GTT offset */ ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn); - +unlock: mutex_unlock(&dev->struct_mutex); switch (ret) { + case 0: + case -ERESTARTSYS: + return VM_FAULT_NOPAGE; case -ENOMEM: case -EAGAIN: return VM_FAULT_OOM; - case -EFAULT: - case -EINVAL: - return VM_FAULT_SIGBUS; default: - return VM_FAULT_NOPAGE; + return VM_FAULT_SIGBUS; } } -- cgit v1.2.3