1 files changed, 403 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
new file mode 100644
index 000000000000..e391e81d3640
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
@@ -0,0 +1,403 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021-2022 Intel Corporation
+ * Copyright (C) 2021-2002 Red Hat
+ */
+
+#include <drm/drm_managed.h>
+
+#include <drm/ttm/ttm_range_manager.h>
+#include <drm/ttm/ttm_placement.h>
+
+#include "xe_bo.h"
+#include "xe_device.h"
+#include "xe_gt.h"
+#include "xe_res_cursor.h"
+#include "xe_ttm_vram_mgr.h"
+
+static inline struct xe_ttm_vram_mgr *
+to_vram_mgr(struct ttm_resource_manager *man)
+{
+	return container_of(man, struct xe_ttm_vram_mgr, manager);
+}
+
+static inline struct xe_gt *
+mgr_to_gt(struct xe_ttm_vram_mgr *mgr)
+{
+	return mgr->gt;
+}
+
+static inline struct drm_buddy_block *
+xe_ttm_vram_mgr_first_block(struct list_head *list)
+{
+	return list_first_entry_or_null(list, struct drm_buddy_block, link);
+}
+
+static inline bool xe_is_vram_mgr_blocks_contiguous(struct list_head *head)
+{
+	struct drm_buddy_block *block;
+	u64 start, size;
+
+	block = xe_ttm_vram_mgr_first_block(head);
+	if (!block)
+		return false;
+
+	while (head != block->link.next) {
+		start = xe_ttm_vram_mgr_block_start(block);
+		size = xe_ttm_vram_mgr_block_size(block);
+
+		block = list_entry(block->link.next, struct drm_buddy_block,
+				   link);
+		if (start + size != xe_ttm_vram_mgr_block_start(block))
+			return false;
+	}
+
+	return true;
+}
+
+static int xe_ttm_vram_mgr_new(struct ttm_resource_manager *man,
+			       struct ttm_buffer_object *tbo,
+			       const struct ttm_place *place,
+			       struct ttm_resource **res)
+{
+	u64 max_bytes, cur_size, min_block_size;
+	struct xe_ttm_vram_mgr *mgr = to_vram_mgr(man);
+	struct xe_ttm_vram_mgr_resource *vres;
+	u64 size, remaining_size, lpfn, fpfn;
+	struct drm_buddy *mm = &mgr->mm;
+	struct drm_buddy_block *block;
+	unsigned long pages_per_block;
+	int r;
+
+	lpfn = (u64)place->lpfn << PAGE_SHIFT;
+	if (!lpfn)
+		lpfn = man->size;
+
+	fpfn = (u64)place->fpfn << PAGE_SHIFT;
+
+	max_bytes = mgr->gt->mem.vram.size;
+	if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
+		pages_per_block = ~0ul;
+	} else {
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+		pages_per_block = HPAGE_PMD_NR;
+#else
+		/* default to 2MB */
+		pages_per_block = 2UL << (20UL - PAGE_SHIFT);
+#endif
+
+		pages_per_block = max_t(uint32_t, pages_per_block,
+					tbo->page_alignment);
+	}
+
+	vres = kzalloc(sizeof(*vres), GFP_KERNEL);
+	if (!vres)
+		return -ENOMEM;
+
+	ttm_resource_init(tbo, place, &vres->base);
+	remaining_size = vres->base.size;
+
+	/* bail out quickly if there's likely not enough VRAM for this BO */
+	if (ttm_resource_manager_usage(man) > max_bytes) {
+		r = -ENOSPC;
+		goto error_fini;
+	}
+
+	INIT_LIST_HEAD(&vres->blocks);
+
+	if (place->flags & TTM_PL_FLAG_TOPDOWN)
+		vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
+
+	if (fpfn || lpfn != man->size)
+		/* Allocate blocks in desired range */
+		vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
+
+	mutex_lock(&mgr->lock);
+	while (remaining_size) {
+		if (tbo->page_alignment)
+			min_block_size = tbo->page_alignment << PAGE_SHIFT;
+		else
+			min_block_size = mgr->default_page_size;
+
+		XE_BUG_ON(min_block_size < mm->chunk_size);
+
+		/* Limit maximum size to 2GiB due to SG table limitations */
+		size = min(remaining_size, 2ULL << 30);
+
+		if (size >= pages_per_block << PAGE_SHIFT)
+			min_block_size = pages_per_block << PAGE_SHIFT;
+
+		cur_size = size;
+
+		if (fpfn + size != place->lpfn << PAGE_SHIFT) {
+			/*
+			 * Except for actual range allocation, modify the size and
+			 * min_block_size conforming to continuous flag enablement
+			 */
+			if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
+				size = roundup_pow_of_two(size);
+				min_block_size = size;
+			/*
+			 * Modify the size value if size is not
+			 * aligned with min_block_size
+			 */
+			} else if (!IS_ALIGNED(size, min_block_size)) {
+				size = round_up(size, min_block_size);
+			}
+		}
+
+		r = drm_buddy_alloc_blocks(mm, fpfn,
+					   lpfn,
+					   size,
+					   min_block_size,
+					   &vres->blocks,
+					   vres->flags);
+		if (unlikely(r))
+			goto error_free_blocks;
+
+		if (size > remaining_size)
+			remaining_size = 0;
+		else
+			remaining_size -= size;
+	}
+	mutex_unlock(&mgr->lock);
+
+	if (cur_size != size) {
+		struct drm_buddy_block *block;
+		struct list_head *trim_list;
+		u64 original_size;
+		LIST_HEAD(temp);
+
+		trim_list = &vres->blocks;
+		original_size = vres->base.size;
+
+		/*
+		 * If size value is rounded up to min_block_size, trim the last
+		 * block to the required size
+		 */
+		if (!list_is_singular(&vres->blocks)) {
+			block = list_last_entry(&vres->blocks, typeof(*block), link);
+			list_move_tail(&block->link, &temp);
+			trim_list = &temp;
+			/*
+			 * Compute the original_size value by subtracting the
+			 * last block size with (aligned size - original size)
+			 */
+			original_size = xe_ttm_vram_mgr_block_size(block) -
+				(size - cur_size);
+		}
+
+		mutex_lock(&mgr->lock);
+		drm_buddy_block_trim(mm,
+				     original_size,
+				     trim_list);
+		mutex_unlock(&mgr->lock);
+
+		if (!list_empty(&temp))
+			list_splice_tail(trim_list, &vres->blocks);
+	}
+
+	vres->base.start = 0;
+	list_for_each_entry(block, &vres->blocks, link) {
+		unsigned long start;
+
+		start = xe_ttm_vram_mgr_block_start(block) +
+			xe_ttm_vram_mgr_block_size(block);
+		start >>= PAGE_SHIFT;
+
+		if (start > PFN_UP(vres->base.size))
+			start -= PFN_UP(vres->base.size);
+		else
+			start = 0;
+		vres->base.start = max(vres->base.start, start);
+	}
+
+	if (xe_is_vram_mgr_blocks_contiguous(&vres->blocks))
+		vres->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
+
+	*res = &vres->base;
+	return 0;
+
+error_free_blocks:
+	drm_buddy_free_list(mm, &vres->blocks);
+	mutex_unlock(&mgr->lock);
+error_fini:
+	ttm_resource_fini(man, &vres->base);
+	kfree(vres);
+
+	return r;
+}
+
+static void xe_ttm_vram_mgr_del(struct ttm_resource_manager *man,
+				struct ttm_resource *res)
+{
+	struct xe_ttm_vram_mgr_resource *vres =
+		to_xe_ttm_vram_mgr_resource(res);
+	struct xe_ttm_vram_mgr *mgr = to_vram_mgr(man);
+	struct drm_buddy *mm = &mgr->mm;
+
+	mutex_lock(&mgr->lock);
+	drm_buddy_free_list(mm, &vres->blocks);
+	mutex_unlock(&mgr->lock);
+
+	ttm_resource_fini(man, res);
+
+	kfree(vres);
+}
+
+static void xe_ttm_vram_mgr_debug(struct ttm_resource_manager *man,
+				  struct drm_printer *printer)
+{
+	struct xe_ttm_vram_mgr *mgr = to_vram_mgr(man);
+	struct drm_buddy *mm = &mgr->mm;
+
+	mutex_lock(&mgr->lock);
+	drm_buddy_print(mm, printer);
+	mutex_unlock(&mgr->lock);
+	drm_printf(printer, "man size:%llu\n", man->size);
+}
+
+static const struct ttm_resource_manager_func xe_ttm_vram_mgr_func = {
+	.alloc	= xe_ttm_vram_mgr_new,
+	.free	= xe_ttm_vram_mgr_del,
+	.debug	= xe_ttm_vram_mgr_debug
+};
+
+static void ttm_vram_mgr_fini(struct drm_device *drm, void *arg)
+{
+	struct xe_ttm_vram_mgr *mgr = arg;
+	struct xe_device *xe = gt_to_xe(mgr->gt);
+	struct ttm_resource_manager *man = &mgr->manager;
+	int err;
+
+	ttm_resource_manager_set_used(man, false);
+
+	err = ttm_resource_manager_evict_all(&xe->ttm, man);
+	if (err)
+		return;
+
+	drm_buddy_fini(&mgr->mm);
+
+	ttm_resource_manager_cleanup(man);
+	ttm_set_driver_manager(&xe->ttm, XE_PL_VRAM0 + mgr->gt->info.vram_id,
+			       NULL);
+}
+
+int xe_ttm_vram_mgr_init(struct xe_gt *gt, struct xe_ttm_vram_mgr *mgr)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+	struct ttm_resource_manager *man = &mgr->manager;
+	int err;
+
+	XE_BUG_ON(xe_gt_is_media_type(gt));
+
+	mgr->gt = gt;
+	man->func = &xe_ttm_vram_mgr_func;
+
+	ttm_resource_manager_init(man, &xe->ttm, gt->mem.vram.size);
+	err = drm_buddy_init(&mgr->mm, man->size, PAGE_SIZE);
+	if (err)
+		return err;
+
+	mutex_init(&mgr->lock);
+	mgr->default_page_size = PAGE_SIZE;
+
+	ttm_set_driver_manager(&xe->ttm, XE_PL_VRAM0 + gt->info.vram_id,
+			       &mgr->manager);
+	ttm_resource_manager_set_used(man, true);
+
+	err = drmm_add_action_or_reset(&xe->drm, ttm_vram_mgr_fini, mgr);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+int xe_ttm_vram_mgr_alloc_sgt(struct xe_device *xe,
+			      struct ttm_resource *res,
+			      u64 offset, u64 length,
+			      struct device *dev,
+			      enum dma_data_direction dir,
+			      struct sg_table **sgt)
+{
+	struct xe_gt *gt = xe_device_get_gt(xe, res->mem_type - XE_PL_VRAM0);
+	struct xe_res_cursor cursor;
+	struct scatterlist *sg;
+	int num_entries = 0;
+	int i, r;
+
+	*sgt = kmalloc(sizeof(**sgt), GFP_KERNEL);
+	if (!*sgt)
+		return -ENOMEM;
+
+	/* Determine the number of DRM_BUDDY blocks to export */
+	xe_res_first(res, offset, length, &cursor);
+	while (cursor.remaining) {
+		num_entries++;
+		xe_res_next(&cursor, cursor.size);
+	}
+
+	r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL);
+	if (r)
+		goto error_free;
+
+	/* Initialize scatterlist nodes of sg_table */
+	for_each_sgtable_sg((*sgt), sg, i)
+		sg->length = 0;
+
+	/*
+	 * Walk down DRM_BUDDY blocks to populate scatterlist nodes
+	 * @note: Use iterator api to get first the DRM_BUDDY block
+	 * and the number of bytes from it. Access the following
+	 * DRM_BUDDY block(s) if more buffer needs to exported
+	 */
+	xe_res_first(res, offset, length, &cursor);
+	for_each_sgtable_sg((*sgt), sg, i) {
+		phys_addr_t phys = cursor.start + gt->mem.vram.io_start;
+		size_t size = cursor.size;
+		dma_addr_t addr;
+
+		addr = dma_map_resource(dev, phys, size, dir,
+					DMA_ATTR_SKIP_CPU_SYNC);
+		r = dma_mapping_error(dev, addr);
+		if (r)
+			goto error_unmap;
+
+		sg_set_page(sg, NULL, size, 0);
+		sg_dma_address(sg) = addr;
+		sg_dma_len(sg) = size;
+
+		xe_res_next(&cursor, cursor.size);
+	}
+
+	return 0;
+
+error_unmap:
+	for_each_sgtable_sg((*sgt), sg, i) {
+		if (!sg->length)
+			continue;
+
+		dma_unmap_resource(dev, sg->dma_address,
+				   sg->length, dir,
+				   DMA_ATTR_SKIP_CPU_SYNC);
+	}
+	sg_free_table(*sgt);
+
+error_free:
+	kfree(*sgt);
+	return r;
+}
+
+void xe_ttm_vram_mgr_free_sgt(struct device *dev, enum dma_data_direction dir,
+			      struct sg_table *sgt)
+{
+	struct scatterlist *sg;
+	int i;
+
+	for_each_sgtable_sg(sgt, sg, i)
+		dma_unmap_resource(dev, sg->dma_address,
+				   sg->length, dir,
+				   DMA_ATTR_SKIP_CPU_SYNC);
+	sg_free_table(sgt);
+	kfree(sgt);
+}