1 files changed, 468 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
new file mode 100644
index 000000000..f43fa69a1
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -0,0 +1,468 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ */
+
+#define pr_fmt(fmt) "[TTM] " fmt
+
+#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include <linux/shmem_fs.h>
+#include <linux/file.h>
+#include <drm/drm_cache.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_page_alloc.h>
+#include <drm/ttm/ttm_set_memory.h>
+
+/**
+ * Allocates a ttm structure for the given BO.
+ */
+int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
+{
+	struct ttm_bo_device *bdev = bo->bdev;
+	uint32_t page_flags = 0;
+
+	dma_resv_assert_held(bo->base.resv);
+
+	if (bo->ttm)
+		return 0;
+
+	if (bdev->need_dma32)
+		page_flags |= TTM_PAGE_FLAG_DMA32;
+
+	if (bdev->no_retry)
+		page_flags |= TTM_PAGE_FLAG_NO_RETRY;
+
+	switch (bo->type) {
+	case ttm_bo_type_device:
+		if (zero_alloc)
+			page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
+		break;
+	case ttm_bo_type_kernel:
+		break;
+	case ttm_bo_type_sg:
+		page_flags |= TTM_PAGE_FLAG_SG;
+		break;
+	default:
+		pr_err("Illegal buffer object type\n");
+		return -EINVAL;
+	}
+
+	bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);
+	if (unlikely(bo->ttm == NULL))
+		return -ENOMEM;
+
+	return 0;
+}
+
+/**
+ * Allocates storage for pointers to the pages that back the ttm.
+ */
+static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
+{
+	ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
+			GFP_KERNEL | __GFP_ZERO);
+	if (!ttm->pages)
+		return -ENOMEM;
+	return 0;
+}
+
+static int ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
+{
+	ttm->ttm.pages = kvmalloc_array(ttm->ttm.num_pages,
+					  sizeof(*ttm->ttm.pages) +
+					  sizeof(*ttm->dma_address),
+					  GFP_KERNEL | __GFP_ZERO);
+	if (!ttm->ttm.pages)
+		return -ENOMEM;
+	ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
+	return 0;
+}
+
+static int ttm_sg_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
+{
+	ttm->dma_address = kvmalloc_array(ttm->ttm.num_pages,
+					  sizeof(*ttm->dma_address),
+					  GFP_KERNEL | __GFP_ZERO);
+	if (!ttm->dma_address)
+		return -ENOMEM;
+	return 0;
+}
+
+static int ttm_tt_set_page_caching(struct page *p,
+				   enum ttm_caching_state c_old,
+				   enum ttm_caching_state c_new)
+{
+	int ret = 0;
+
+	if (PageHighMem(p))
+		return 0;
+
+	if (c_old != tt_cached) {
+		/* p isn't in the default caching state, set it to
+		 * writeback first to free its current memtype. */
+
+		ret = ttm_set_pages_wb(p, 1);
+		if (ret)
+			return ret;
+	}
+
+	if (c_new == tt_wc)
+		ret = ttm_set_pages_wc(p, 1);
+	else if (c_new == tt_uncached)
+		ret = ttm_set_pages_uc(p, 1);
+
+	return ret;
+}
+
+/*
+ * Change caching policy for the linear kernel map
+ * for range of pages in a ttm.
+ */
+
+static int ttm_tt_set_caching(struct ttm_tt *ttm,
+			      enum ttm_caching_state c_state)
+{
+	int i, j;
+	struct page *cur_page;
+	int ret;
+
+	if (ttm->caching_state == c_state)
+		return 0;
+
+	if (!ttm_tt_is_populated(ttm)) {
+		/* Change caching but don't populate */
+		ttm->caching_state = c_state;
+		return 0;
+	}
+
+	if (ttm->caching_state == tt_cached)
+		drm_clflush_pages(ttm->pages, ttm->num_pages);
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		cur_page = ttm->pages[i];
+		if (likely(cur_page != NULL)) {
+			ret = ttm_tt_set_page_caching(cur_page,
+						      ttm->caching_state,
+						      c_state);
+			if (unlikely(ret != 0))
+				goto out_err;
+		}
+	}
+
+	ttm->caching_state = c_state;
+
+	return 0;
+
+out_err:
+	for (j = 0; j < i; ++j) {
+		cur_page = ttm->pages[j];
+		if (likely(cur_page != NULL)) {
+			(void)ttm_tt_set_page_caching(cur_page, c_state,
+						      ttm->caching_state);
+		}
+	}
+
+	return ret;
+}
+
+int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
+{
+	enum ttm_caching_state state;
+
+	if (placement & TTM_PL_FLAG_WC)
+		state = tt_wc;
+	else if (placement & TTM_PL_FLAG_UNCACHED)
+		state = tt_uncached;
+	else
+		state = tt_cached;
+
+	return ttm_tt_set_caching(ttm, state);
+}
+EXPORT_SYMBOL(ttm_tt_set_placement_caching);
+
+void ttm_tt_destroy_common(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
+{
+	ttm_tt_unpopulate(bdev, ttm);
+
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
+	    ttm->swap_storage)
+		fput(ttm->swap_storage);
+
+	ttm->swap_storage = NULL;
+}
+EXPORT_SYMBOL(ttm_tt_destroy_common);
+
+void ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
+{
+	bdev->driver->ttm_tt_destroy(bdev, ttm);
+}
+
+static void ttm_tt_init_fields(struct ttm_tt *ttm,
+			       struct ttm_buffer_object *bo,
+			       uint32_t page_flags)
+{
+	ttm->num_pages = bo->num_pages;
+	ttm->caching_state = tt_cached;
+	ttm->page_flags = page_flags;
+	ttm_tt_set_unpopulated(ttm);
+	ttm->swap_storage = NULL;
+	ttm->sg = bo->sg;
+}
+
+int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
+		uint32_t page_flags)
+{
+	ttm_tt_init_fields(ttm, bo, page_flags);
+
+	if (ttm_tt_alloc_page_directory(ttm)) {
+		pr_err("Failed allocating page table\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ttm_tt_init);
+
+void ttm_tt_fini(struct ttm_tt *ttm)
+{
+	kvfree(ttm->pages);
+	ttm->pages = NULL;
+}
+EXPORT_SYMBOL(ttm_tt_fini);
+
+int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+		    uint32_t page_flags)
+{
+	struct ttm_tt *ttm = &ttm_dma->ttm;
+
+	ttm_tt_init_fields(ttm, bo, page_flags);
+
+	INIT_LIST_HEAD(&ttm_dma->pages_list);
+	if (ttm_dma_tt_alloc_page_directory(ttm_dma)) {
+		pr_err("Failed allocating page table\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ttm_dma_tt_init);
+
+int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+		   uint32_t page_flags)
+{
+	struct ttm_tt *ttm = &ttm_dma->ttm;
+	int ret;
+
+	ttm_tt_init_fields(ttm, bo, page_flags);
+
+	INIT_LIST_HEAD(&ttm_dma->pages_list);
+	if (page_flags & TTM_PAGE_FLAG_SG)
+		ret = ttm_sg_tt_alloc_page_directory(ttm_dma);
+	else
+		ret = ttm_dma_tt_alloc_page_directory(ttm_dma);
+	if (ret) {
+		pr_err("Failed allocating page table\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ttm_sg_tt_init);
+
+void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
+{
+	struct ttm_tt *ttm = &ttm_dma->ttm;
+
+	if (ttm->pages)
+		kvfree(ttm->pages);
+	else
+		kvfree(ttm_dma->dma_address);
+	ttm->pages = NULL;
+	ttm_dma->dma_address = NULL;
+}
+EXPORT_SYMBOL(ttm_dma_tt_fini);
+
+int ttm_tt_swapin(struct ttm_tt *ttm)
+{
+	struct address_space *swap_space;
+	struct file *swap_storage;
+	struct page *from_page;
+	struct page *to_page;
+	int i;
+	int ret = -ENOMEM;
+
+	swap_storage = ttm->swap_storage;
+	BUG_ON(swap_storage == NULL);
+
+	swap_space = swap_storage->f_mapping;
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		gfp_t gfp_mask = mapping_gfp_mask(swap_space);
+
+		gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
+		from_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
+
+		if (IS_ERR(from_page)) {
+			ret = PTR_ERR(from_page);
+			goto out_err;
+		}
+		to_page = ttm->pages[i];
+		if (unlikely(to_page == NULL))
+			goto out_err;
+
+		copy_highpage(to_page, from_page);
+		put_page(from_page);
+	}
+
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
+		fput(swap_storage);
+	ttm->swap_storage = NULL;
+	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
+
+	return 0;
+out_err:
+	return ret;
+}
+
+int ttm_tt_swapout(struct ttm_bo_device *bdev,
+		   struct ttm_tt *ttm, struct file *persistent_swap_storage)
+{
+	struct address_space *swap_space;
+	struct file *swap_storage;
+	struct page *from_page;
+	struct page *to_page;
+	int i;
+	int ret = -ENOMEM;
+
+	BUG_ON(ttm->caching_state != tt_cached);
+
+	if (!persistent_swap_storage) {
+		swap_storage = shmem_file_setup("ttm swap",
+						ttm->num_pages << PAGE_SHIFT,
+						0);
+		if (IS_ERR(swap_storage)) {
+			pr_err("Failed allocating swap storage\n");
+			return PTR_ERR(swap_storage);
+		}
+	} else {
+		swap_storage = persistent_swap_storage;
+	}
+
+	swap_space = swap_storage->f_mapping;
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		gfp_t gfp_mask = mapping_gfp_mask(swap_space);
+
+		gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
+
+		from_page = ttm->pages[i];
+		if (unlikely(from_page == NULL))
+			continue;
+
+		to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
+		if (IS_ERR(to_page)) {
+			ret = PTR_ERR(to_page);
+			goto out_err;
+		}
+		copy_highpage(to_page, from_page);
+		set_page_dirty(to_page);
+		mark_page_accessed(to_page);
+		put_page(to_page);
+	}
+
+	ttm_tt_unpopulate(bdev, ttm);
+	ttm->swap_storage = swap_storage;
+	ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
+	if (persistent_swap_storage)
+		ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
+
+	return 0;
+out_err:
+	if (!persistent_swap_storage)
+		fput(swap_storage);
+
+	return ret;
+}
+
+static void ttm_tt_add_mapping(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
+{
+	pgoff_t i;
+
+	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
+		return;
+
+	for (i = 0; i < ttm->num_pages; ++i)
+		ttm->pages[i]->mapping = bdev->dev_mapping;
+}
+
+int ttm_tt_populate(struct ttm_bo_device *bdev,
+		    struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
+{
+	int ret;
+
+	if (!ttm)
+		return -EINVAL;
+
+	if (ttm_tt_is_populated(ttm))
+		return 0;
+
+	if (bdev->driver->ttm_tt_populate)
+		ret = bdev->driver->ttm_tt_populate(bdev, ttm, ctx);
+	else
+		ret = ttm_pool_populate(ttm, ctx);
+	if (!ret)
+		ttm_tt_add_mapping(bdev, ttm);
+	return ret;
+}
+EXPORT_SYMBOL(ttm_tt_populate);
+
+static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
+{
+	pgoff_t i;
+	struct page **page = ttm->pages;
+
+	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
+		return;
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		(*page)->mapping = NULL;
+		(*page++)->index = 0;
+	}
+}
+
+void ttm_tt_unpopulate(struct ttm_bo_device *bdev,
+		       struct ttm_tt *ttm)
+{
+	if (!ttm_tt_is_populated(ttm))
+		return;
+
+	ttm_tt_clear_mapping(ttm);
+	if (bdev->driver->ttm_tt_unpopulate)
+		bdev->driver->ttm_tt_unpopulate(bdev, ttm);
+	else
+		ttm_pool_unpopulate(ttm);
+}