drm/ttm: remove userspace backed ttm object support

This was never use in none of the driver, properly using userspace
page for bo would need more code (vma interaction mostly). Removing
this dead code in preparation of ttm_tt & backend merge.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>

2 files changed, 1 insertions, 126 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 617b646..4bde335 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -342,22 +342,6 @@ static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 		if (unlikely(bo->ttm == NULL))
 			ret = -ENOMEM;
 		break;
-	case ttm_bo_type_user:
-		bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
-					page_flags | TTM_PAGE_FLAG_USER,
-					glob->dummy_read_page);
-		if (unlikely(bo->ttm == NULL)) {
-			ret = -ENOMEM;
-			break;
-		}
-
-		ret = ttm_tt_set_user(bo->ttm, current,
-				      bo->buffer_start, bo->num_pages);
-		if (unlikely(ret != 0)) {
-			ttm_tt_destroy(bo->ttm);
-			bo->ttm = NULL;
-		}
-		break;
 	default:
 		printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 		ret = -EINVAL;
@@ -907,16 +891,12 @@ static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 }
 
 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
-				 bool disallow_fixed,
 				 uint32_t mem_type,
 				 uint32_t proposed_placement,
 				 uint32_t *masked_placement)
 {
 	uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 
-	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
-		return false;
-
 	if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 		return false;
 
@@ -961,7 +941,6 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 		man = &bdev->man[mem_type];
 
 		type_ok = ttm_bo_mt_compatible(man,
-						bo->type == ttm_bo_type_user,
 						mem_type,
 						placement->placement[i],
 						&cur_flags);
@@ -1009,7 +988,6 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 		if (!man->has_type)
 			continue;
 		if (!ttm_bo_mt_compatible(man,
-						bo->type == ttm_bo_type_user,
 						mem_type,
 						placement->busy_placement[i],
 						&cur_flags))
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index f9cc548..c68b0e7 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -63,43 +63,6 @@ static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
 	ttm->dma_address = NULL;
 }
 
-static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
-{
-	int write;
-	int dirty;
-	struct page *page;
-	int i;
-	struct ttm_backend *be = ttm->be;
-
-	BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER));
-	write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0);
-	dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0);
-
-	if (be)
-		be->func->clear(be);
-
-	for (i = 0; i < ttm->num_pages; ++i) {
-		page = ttm->pages[i];
-		if (page == NULL)
-			continue;
-
-		if (page == ttm->dummy_read_page) {
-			BUG_ON(write);
-			continue;
-		}
-
-		if (write && dirty && !PageReserved(page))
-			set_page_dirty_lock(page);
-
-		ttm->pages[i] = NULL;
-		ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE);
-		put_page(page);
-	}
-	ttm->state = tt_unpopulated;
-	ttm->first_himem_page = ttm->num_pages;
-	ttm->last_lomem_page = -1;
-}
-
 static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
 {
 	struct page *p;
@@ -326,10 +289,7 @@ void ttm_tt_destroy(struct ttm_tt *ttm)
 	}
 
 	if (likely(ttm->pages != NULL)) {
-		if (ttm->page_flags & TTM_PAGE_FLAG_USER)
-			ttm_tt_free_user_pages(ttm);
-		else
-			ttm_tt_free_alloced_pages(ttm);
+		ttm_tt_free_alloced_pages(ttm);
 
 		ttm_tt_free_page_directory(ttm);
 	}
@@ -341,45 +301,6 @@ void ttm_tt_destroy(struct ttm_tt *ttm)
 	kfree(ttm);
 }
 
-int ttm_tt_set_user(struct ttm_tt *ttm,
-		    struct task_struct *tsk,
-		    unsigned long start, unsigned long num_pages)
-{
-	struct mm_struct *mm = tsk->mm;
-	int ret;
-	int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
-	struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
-
-	BUG_ON(num_pages != ttm->num_pages);
-	BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
-
-	/**
-	 * Account user pages as lowmem pages for now.
-	 */
-
-	ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
-				   false, false);
-	if (unlikely(ret != 0))
-		return ret;
-
-	down_read(&mm->mmap_sem);
-	ret = get_user_pages(tsk, mm, start, num_pages,
-			     write, 0, ttm->pages, NULL);
-	up_read(&mm->mmap_sem);
-
-	if (ret != num_pages && write) {
-		ttm_tt_free_user_pages(ttm);
-		ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE);
-		return -ENOMEM;
-	}
-
-	ttm->tsk = tsk;
-	ttm->start = start;
-	ttm->state = tt_unbound;
-
-	return 0;
-}
-
 struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
 			     uint32_t page_flags, struct page *dummy_read_page)
 {
@@ -453,8 +374,6 @@ int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 
 	ttm->state = tt_bound;
 
-	if (ttm->page_flags & TTM_PAGE_FLAG_USER)
-		ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
 	return 0;
 }
 EXPORT_SYMBOL(ttm_tt_bind);
@@ -470,16 +389,6 @@ static int ttm_tt_swapin(struct ttm_tt *ttm)
 	int i;
 	int ret = -ENOMEM;
 
-	if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
-		ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
-				      ttm->num_pages);
-		if (unlikely(ret != 0))
-			return ret;
-
-		ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
-		return 0;
-	}
-
 	swap_storage = ttm->swap_storage;
 	BUG_ON(swap_storage == NULL);
 
@@ -530,18 +439,6 @@ int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
 	BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
 	BUG_ON(ttm->caching_state != tt_cached);
 
-	/*
-	 * For user buffers, just unpin the pages, as there should be
-	 * vma references.
-	 */
-
-	if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
-		ttm_tt_free_user_pages(ttm);
-		ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
-		ttm->swap_storage = NULL;
-		return 0;
-	}
-
 	if (!persistent_swap_storage) {
 		swap_storage = shmem_file_setup("ttm swap",
 						ttm->num_pages << PAGE_SHIFT,