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Merge tag 'ttm-fixes-3.14-2014-03-12' of git://people.freedesktop.org/~thomash/linux into drm-fixes

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Second pull request of 2014-03-12. The first one was requested to be canceled.

Rob's fix for oops on invalidate_caches() and a fix for a
performance regression.

* tag 'ttm-fixes-3.14-2014-03-12' of git://people.freedesktop.org/~thomash/linux:
  drm/ttm: don't oops if no invalidate_caches()
  drm/ttm: Work around performance regression with VM_PFNMAP
This commit is contained in:
Dave Airlie 2014-03-13 17:31:24 +10:00
commit f042cc4a60
2 changed files with 12 additions and 8 deletions
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8
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -351,9 +351,11 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
moved:
if (bo->evicted) {
ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
if (ret)
pr_err("Can not flush read caches\n");
if (bdev->driver->invalidate_caches) {
ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
if (ret)
pr_err("Can not flush read caches\n");
}
bo->evicted = false;
}

12
drivers/gpu/drm/ttm/ttm_bo_vm.c
View File

@ -339,11 +339,13 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
vma->vm_private_data = bo;
/*
* PFNMAP is faster than MIXEDMAP due to reduced page
* administration. So use MIXEDMAP only if private VMA, where
* we need to support COW.
* We'd like to use VM_PFNMAP on shared mappings, where
* (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
* but for some reason VM_PFNMAP + x86 PAT + write-combine is very
* bad for performance. Until that has been sorted out, use
* VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
*/
vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP;
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
return 0;
out_unref:
@ -359,7 +361,7 @@ int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
vma->vm_ops = &ttm_bo_vm_ops;
vma->vm_private_data = ttm_bo_reference(bo);
vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP;
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_flags |= VM_IO | VM_DONTEXPAND;
return 0;
}