261 lines
6.8 KiB
C
261 lines
6.8 KiB
C
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// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2021 Intel Corporation
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*/
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#include <linux/slab.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include <drm/ttm/ttm_placement.h>
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#include "i915_ttm_buddy_manager.h"
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#include "i915_buddy.h"
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#include "i915_gem.h"
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struct i915_ttm_buddy_manager {
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struct ttm_resource_manager manager;
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struct i915_buddy_mm mm;
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struct list_head reserved;
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struct mutex lock;
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u64 default_page_size;
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};
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static struct i915_ttm_buddy_manager *
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to_buddy_manager(struct ttm_resource_manager *man)
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{
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return container_of(man, struct i915_ttm_buddy_manager, manager);
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}
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static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
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struct ttm_buffer_object *bo,
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const struct ttm_place *place,
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struct ttm_resource **res)
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{
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struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
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struct i915_ttm_buddy_resource *bman_res;
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struct i915_buddy_mm *mm = &bman->mm;
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unsigned long n_pages;
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unsigned int min_order;
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u64 min_page_size;
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u64 size;
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int err;
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GEM_BUG_ON(place->fpfn || place->lpfn);
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bman_res = kzalloc(sizeof(*bman_res), GFP_KERNEL);
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if (!bman_res)
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return -ENOMEM;
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ttm_resource_init(bo, place, &bman_res->base);
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INIT_LIST_HEAD(&bman_res->blocks);
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bman_res->mm = mm;
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GEM_BUG_ON(!bman_res->base.num_pages);
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size = bman_res->base.num_pages << PAGE_SHIFT;
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min_page_size = bman->default_page_size;
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if (bo->page_alignment)
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min_page_size = bo->page_alignment << PAGE_SHIFT;
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GEM_BUG_ON(min_page_size < mm->chunk_size);
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min_order = ilog2(min_page_size) - ilog2(mm->chunk_size);
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if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
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size = roundup_pow_of_two(size);
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min_order = ilog2(size) - ilog2(mm->chunk_size);
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}
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if (size > mm->size) {
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err = -E2BIG;
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goto err_free_res;
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}
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n_pages = size >> ilog2(mm->chunk_size);
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do {
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struct i915_buddy_block *block;
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unsigned int order;
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order = fls(n_pages) - 1;
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GEM_BUG_ON(order > mm->max_order);
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GEM_BUG_ON(order < min_order);
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do {
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mutex_lock(&bman->lock);
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block = i915_buddy_alloc(mm, order);
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mutex_unlock(&bman->lock);
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if (!IS_ERR(block))
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break;
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if (order-- == min_order) {
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err = -ENOSPC;
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goto err_free_blocks;
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}
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} while (1);
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n_pages -= BIT(order);
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list_add_tail(&block->link, &bman_res->blocks);
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if (!n_pages)
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break;
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} while (1);
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*res = &bman_res->base;
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return 0;
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err_free_blocks:
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mutex_lock(&bman->lock);
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i915_buddy_free_list(mm, &bman_res->blocks);
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mutex_unlock(&bman->lock);
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err_free_res:
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ttm_resource_fini(man, &bman_res->base);
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kfree(bman_res);
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return err;
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}
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static void i915_ttm_buddy_man_free(struct ttm_resource_manager *man,
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struct ttm_resource *res)
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{
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struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res);
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struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
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mutex_lock(&bman->lock);
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i915_buddy_free_list(&bman->mm, &bman_res->blocks);
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mutex_unlock(&bman->lock);
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ttm_resource_fini(man, res);
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kfree(bman_res);
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}
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static const struct ttm_resource_manager_func i915_ttm_buddy_manager_func = {
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.alloc = i915_ttm_buddy_man_alloc,
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.free = i915_ttm_buddy_man_free,
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};
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/**
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* i915_ttm_buddy_man_init - Setup buddy allocator based ttm manager
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* @bdev: The ttm device
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* @type: Memory type we want to manage
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* @use_tt: Set use_tt for the manager
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* @size: The size in bytes to manage
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* @default_page_size: The default minimum page size in bytes for allocations,
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* this must be at least as large as @chunk_size, and can be overridden by
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* setting the BO page_alignment, to be larger or smaller as needed.
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* @chunk_size: The minimum page size in bytes for our allocations i.e
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* order-zero
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*
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* Note that the starting address is assumed to be zero here, since this
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* simplifies keeping the property where allocated blocks having natural
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* power-of-two alignment. So long as the real starting address is some large
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* power-of-two, or naturally start from zero, then this should be fine. Also
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* the &i915_ttm_buddy_man_reserve interface can be used to preserve alignment
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* if say there is some unusable range from the start of the region. We can
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* revisit this in the future and make the interface accept an actual starting
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* offset and let it take care of the rest.
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*
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* Note that if the @size is not aligned to the @chunk_size then we perform the
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* required rounding to get the usable size. The final size in pages can be
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* taken from &ttm_resource_manager.size.
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*
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* Return: 0 on success, negative error code on failure.
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*/
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int i915_ttm_buddy_man_init(struct ttm_device *bdev,
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unsigned int type, bool use_tt,
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u64 size, u64 default_page_size,
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u64 chunk_size)
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{
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struct ttm_resource_manager *man;
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struct i915_ttm_buddy_manager *bman;
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int err;
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bman = kzalloc(sizeof(*bman), GFP_KERNEL);
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if (!bman)
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return -ENOMEM;
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err = i915_buddy_init(&bman->mm, size, chunk_size);
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if (err)
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goto err_free_bman;
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mutex_init(&bman->lock);
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INIT_LIST_HEAD(&bman->reserved);
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GEM_BUG_ON(default_page_size < chunk_size);
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bman->default_page_size = default_page_size;
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man = &bman->manager;
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man->use_tt = use_tt;
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man->func = &i915_ttm_buddy_manager_func;
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ttm_resource_manager_init(man, bman->mm.size >> PAGE_SHIFT);
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ttm_resource_manager_set_used(man, true);
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ttm_set_driver_manager(bdev, type, man);
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return 0;
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err_free_bman:
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kfree(bman);
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return err;
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}
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/**
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* i915_ttm_buddy_man_fini - Destroy the buddy allocator ttm manager
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* @bdev: The ttm device
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* @type: Memory type we want to manage
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*
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* Note that if we reserved anything with &i915_ttm_buddy_man_reserve, this will
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* also be freed for us here.
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*
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* Return: 0 on success, negative error code on failure.
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*/
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int i915_ttm_buddy_man_fini(struct ttm_device *bdev, unsigned int type)
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{
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struct ttm_resource_manager *man = ttm_manager_type(bdev, type);
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struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
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struct i915_buddy_mm *mm = &bman->mm;
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int ret;
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ttm_resource_manager_set_used(man, false);
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ret = ttm_resource_manager_evict_all(bdev, man);
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if (ret)
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return ret;
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ttm_set_driver_manager(bdev, type, NULL);
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mutex_lock(&bman->lock);
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i915_buddy_free_list(mm, &bman->reserved);
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i915_buddy_fini(mm);
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mutex_unlock(&bman->lock);
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ttm_resource_manager_cleanup(man);
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kfree(bman);
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return 0;
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}
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/**
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* i915_ttm_buddy_man_reserve - Reserve address range
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* @man: The buddy allocator ttm manager
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* @start: The offset in bytes, where the region start is assumed to be zero
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* @size: The size in bytes
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*
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* Note that the starting address for the region is always assumed to be zero.
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*
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* Return: 0 on success, negative error code on failure.
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*/
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int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man,
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u64 start, u64 size)
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{
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struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
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struct i915_buddy_mm *mm = &bman->mm;
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int ret;
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mutex_lock(&bman->lock);
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ret = i915_buddy_alloc_range(mm, &bman->reserved, start, size);
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mutex_unlock(&bman->lock);
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return ret;
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}
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