Needed for some vm operations; most notably unmap_mapping_range() with even_cows = 0.

Signed-off-by: Thomas Hellstrom thellstrom@vmware.com Reviewed-by: Brian Paul brianp@vmware.com --- drivers/gpu/drm/ttm/ttm_bo_vm.c | 5 +++++ drivers/gpu/drm/ttm/ttm_tt.c | 27 +++++++++++++++++++++++---- include/drm/ttm/ttm_bo_driver.h | 9 +++++++++ 3 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index 12d7f53..cfcdf5b 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -226,6 +226,9 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) } else if (unlikely(!page)) { break; } + page->mapping = vma->vm_file->f_mapping; + page->index = drm_vma_node_start(&bo->vma_node) + + page_offset; pfn = page_to_pfn(page); }

@@ -263,6 +266,8 @@ static void ttm_bo_vm_open(struct vm_area_struct *vma) struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;

+ WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping); + (void)ttm_bo_reference(bo); }

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 210d503..9af9908 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -170,9 +170,8 @@ void ttm_tt_destroy(struct ttm_tt *ttm) ttm_tt_unbind(ttm); }

- if (ttm->state == tt_unbound) { - ttm->bdev->driver->ttm_tt_unpopulate(ttm); - } + if (ttm->state == tt_unbound) + ttm_tt_unpopulate(ttm);

if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && ttm->swap_storage) @@ -362,7 +361,7 @@ int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage) page_cache_release(to_page); }

- ttm->bdev->driver->ttm_tt_unpopulate(ttm); + ttm_tt_unpopulate(ttm); ttm->swap_storage = swap_storage; ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; if (persistent_swap_storage) @@ -375,3 +374,23 @@ out_err:

return ret; } + +static void ttm_tt_clear_mapping(struct ttm_tt *ttm) +{ + pgoff_t i; + struct page **page = ttm->pages; + + for (i = 0; i < ttm->num_pages; ++i) { + (*page)->mapping = NULL; + (*page++)->index = 0; + } +} + +void ttm_tt_unpopulate(struct ttm_tt *ttm) +{ + if (ttm->state == tt_unpopulated) + return; + + ttm_tt_clear_mapping(ttm); + ttm->bdev->driver->ttm_tt_unpopulate(ttm); +} diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h index 8639c85..32d34eb 100644 --- a/include/drm/ttm/ttm_bo_driver.h +++ b/include/drm/ttm/ttm_bo_driver.h @@ -681,6 +681,15 @@ extern int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement); extern int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage);

+/** + * ttm_tt_unpopulate - free pages from a ttm + * + * @ttm: Pointer to the ttm_tt structure + * + * Calls the driver method to free all pages from a ttm + */ +extern void ttm_tt_unpopulate(struct ttm_tt *ttm); + /* * ttm_bo.c */