Move the base i915 buddy allocator code into drm - Move i915_buddy.h to include/drm - Move i915_buddy.c to drm root folder - Rename "i915" string with "drm" string wherever applicable - Rename "I915" string with "DRM" string wherever applicable - Fix header file dependencies - Fix alignment issues - add Makefile support for drm buddy - export functions and write kerneldoc description - Remove i915 selftest config check condition as buddy selftest will be moved to drm selftest folder
cleanup i915 buddy references in i915 driver module and replace with drm buddy
v2: - include header file in alphabetical order(Thomas) - merged changes listed in the body section into a single patch to keep the build intact(Christian, Jani)
v3: - make drm buddy a separate module(Thomas, Christian)
v4: - Fix build error reported by kernel test robot lkp@intel.com - removed i915 buddy selftest from i915_mock_selftests.h to avoid build error - removed selftests/i915_buddy.c file as we create a new set of buddy test cases in drm/selftests folder
v5: - Fix merge conflict issue
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com --- drivers/gpu/drm/Kconfig | 6 + drivers/gpu/drm/Makefile | 2 + drivers/gpu/drm/drm_buddy.c | 516 ++++++++++++ drivers/gpu/drm/i915/Kconfig | 1 + drivers/gpu/drm/i915/Makefile | 1 - drivers/gpu/drm/i915/i915_buddy.c | 466 ----------- drivers/gpu/drm/i915/i915_buddy.h | 143 ---- drivers/gpu/drm/i915/i915_module.c | 3 - drivers/gpu/drm/i915/i915_scatterlist.c | 11 +- drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 33 +- drivers/gpu/drm/i915/i915_ttm_buddy_manager.h | 4 +- drivers/gpu/drm/i915/selftests/i915_buddy.c | 787 ------------------ .../drm/i915/selftests/i915_mock_selftests.h | 1 - .../drm/i915/selftests/intel_memory_region.c | 13 +- include/drm/drm_buddy.h | 151 ++++ 15 files changed, 707 insertions(+), 1431 deletions(-) create mode 100644 drivers/gpu/drm/drm_buddy.c delete mode 100644 drivers/gpu/drm/i915/i915_buddy.c delete mode 100644 drivers/gpu/drm/i915/i915_buddy.h delete mode 100644 drivers/gpu/drm/i915/selftests/i915_buddy.c create mode 100644 include/drm/drm_buddy.h
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index b1f22e457fd0..b85f7ffae621 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -198,6 +198,12 @@ config DRM_TTM GPU memory types. Will be enabled automatically if a device driver uses it.
+config DRM_BUDDY + tristate + depends on DRM + help + A page based buddy allocator + config DRM_VRAM_HELPER tristate depends on DRM diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 301a44dc18e3..ff0286eca254 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -42,6 +42,8 @@ obj-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_cma_helper.o drm_shmem_helper-y := drm_gem_shmem_helper.o obj-$(CONFIG_DRM_GEM_SHMEM_HELPER) += drm_shmem_helper.o
+obj-$(CONFIG_DRM_BUDDY) += drm_buddy.o + drm_vram_helper-y := drm_gem_vram_helper.o obj-$(CONFIG_DRM_VRAM_HELPER) += drm_vram_helper.o
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c new file mode 100644 index 000000000000..9340a4b61c5a --- /dev/null +++ b/drivers/gpu/drm/drm_buddy.c @@ -0,0 +1,516 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2021 Intel Corporation + */ + +#include <linux/kmemleak.h> +#include <linux/module.h> +#include <linux/sizes.h> + +#include <drm/drm_buddy.h> + +static struct drm_buddy_block *drm_block_alloc(struct drm_buddy_mm *mm, + struct drm_buddy_block *parent, + unsigned int order, + u64 offset) +{ + struct drm_buddy_block *block; + + BUG_ON(order > DRM_BUDDY_MAX_ORDER); + + block = kmem_cache_zalloc(mm->slab_blocks, GFP_KERNEL); + if (!block) + return NULL; + + block->header = offset; + block->header |= order; + block->parent = parent; + + BUG_ON(block->header & DRM_BUDDY_HEADER_UNUSED); + return block; +} + +static void drm_block_free(struct drm_buddy_mm *mm, + struct drm_buddy_block *block) +{ + kmem_cache_free(mm->slab_blocks, block); +} + +static void mark_allocated(struct drm_buddy_block *block) +{ + block->header &= ~DRM_BUDDY_HEADER_STATE; + block->header |= DRM_BUDDY_ALLOCATED; + + list_del(&block->link); +} + +static void mark_free(struct drm_buddy_mm *mm, + struct drm_buddy_block *block) +{ + block->header &= ~DRM_BUDDY_HEADER_STATE; + block->header |= DRM_BUDDY_FREE; + + list_add(&block->link, + &mm->free_list[drm_buddy_block_order(block)]); +} + +static void mark_split(struct drm_buddy_block *block) +{ + block->header &= ~DRM_BUDDY_HEADER_STATE; + block->header |= DRM_BUDDY_SPLIT; + + list_del(&block->link); +} + +/** + * drm_buddy_init - init memory manager + * + * @mm: DRM buddy manager to initialize + * @size: size in bytes to manage + * @chunk_size: minimum page size in bytes for our allocations + * + * Initializes the memory manager and its resources. + * + * Returns: + * 0 on success, error code on failure. + */ +int drm_buddy_init(struct drm_buddy_mm *mm, u64 size, u64 chunk_size) +{ + unsigned int i; + u64 offset; + + if (size < chunk_size) + return -EINVAL; + + if (chunk_size < PAGE_SIZE) + return -EINVAL; + + if (!is_power_of_2(chunk_size)) + return -EINVAL; + + size = round_down(size, chunk_size); + + mm->size = size; + mm->avail = size; + mm->chunk_size = chunk_size; + mm->max_order = ilog2(size) - ilog2(chunk_size); + + BUG_ON(mm->max_order > DRM_BUDDY_MAX_ORDER); + + mm->slab_blocks = KMEM_CACHE(drm_buddy_block, 0); + if (!mm->slab_blocks) + return -ENOMEM; + + mm->free_list = kmalloc_array(mm->max_order + 1, + sizeof(struct list_head), + GFP_KERNEL); + if (!mm->free_list) + goto out_destroy_slab; + + for (i = 0; i <= mm->max_order; ++i) + INIT_LIST_HEAD(&mm->free_list[i]); + + mm->n_roots = hweight64(size); + + mm->roots = kmalloc_array(mm->n_roots, + sizeof(struct drm_buddy_block *), + GFP_KERNEL); + if (!mm->roots) + goto out_free_list; + + offset = 0; + i = 0; + + /* + * Split into power-of-two blocks, in case we are given a size that is + * not itself a power-of-two. + */ + do { + struct drm_buddy_block *root; + unsigned int order; + u64 root_size; + + root_size = rounddown_pow_of_two(size); + order = ilog2(root_size) - ilog2(chunk_size); + + root = drm_block_alloc(mm, NULL, order, offset); + if (!root) + goto out_free_roots; + + mark_free(mm, root); + + BUG_ON(i > mm->max_order); + BUG_ON(drm_buddy_block_size(mm, root) < chunk_size); + + mm->roots[i] = root; + + offset += root_size; + size -= root_size; + i++; + } while (size); + + return 0; + +out_free_roots: + while (i--) + drm_block_free(mm, mm->roots[i]); + kfree(mm->roots); +out_free_list: + kfree(mm->free_list); +out_destroy_slab: + kmem_cache_destroy(mm->slab_blocks); + return -ENOMEM; +} +EXPORT_SYMBOL(drm_buddy_init); + +/** + * drm_buddy_fini - tear down the memory manager + * + * @mm: DRM buddy manager to free + * + * Cleanup memory manager resources and the freelist + */ +void drm_buddy_fini(struct drm_buddy_mm *mm) +{ + int i; + + for (i = 0; i < mm->n_roots; ++i) { + WARN_ON(!drm_buddy_block_is_free(mm->roots[i])); + drm_block_free(mm, mm->roots[i]); + } + + WARN_ON(mm->avail != mm->size); + + kfree(mm->roots); + kfree(mm->free_list); + kmem_cache_destroy(mm->slab_blocks); +} +EXPORT_SYMBOL(drm_buddy_fini); + +static int split_block(struct drm_buddy_mm *mm, + struct drm_buddy_block *block) +{ + unsigned int block_order = drm_buddy_block_order(block) - 1; + u64 offset = drm_buddy_block_offset(block); + + BUG_ON(!drm_buddy_block_is_free(block)); + BUG_ON(!drm_buddy_block_order(block)); + + block->left = drm_block_alloc(mm, block, block_order, offset); + if (!block->left) + return -ENOMEM; + + block->right = drm_block_alloc(mm, block, block_order, + offset + (mm->chunk_size << block_order)); + if (!block->right) { + drm_block_free(mm, block->left); + return -ENOMEM; + } + + mark_free(mm, block->left); + mark_free(mm, block->right); + + mark_split(block); + + return 0; +} + +static struct drm_buddy_block * +get_buddy(struct drm_buddy_block *block) +{ + struct drm_buddy_block *parent; + + parent = block->parent; + if (!parent) + return NULL; + + if (parent->left == block) + return parent->right; + + return parent->left; +} + +static void __drm_buddy_free(struct drm_buddy_mm *mm, + struct drm_buddy_block *block) +{ + struct drm_buddy_block *parent; + + while ((parent = block->parent)) { + struct drm_buddy_block *buddy; + + buddy = get_buddy(block); + + if (!drm_buddy_block_is_free(buddy)) + break; + + list_del(&buddy->link); + + drm_block_free(mm, block); + drm_block_free(mm, buddy); + + block = parent; + } + + mark_free(mm, block); +} + +void drm_buddy_free(struct drm_buddy_mm *mm, + struct drm_buddy_block *block) +{ + BUG_ON(!drm_buddy_block_is_allocated(block)); + mm->avail += drm_buddy_block_size(mm, block); + __drm_buddy_free(mm, block); +} + +/** + * drm_buddy_free_list - free blocks + * + * @mm: DRM buddy manager + * @objects: input list head to free blocks + */ +void drm_buddy_free_list(struct drm_buddy_mm *mm, struct list_head *objects) +{ + struct drm_buddy_block *block, *on; + + list_for_each_entry_safe(block, on, objects, link) { + drm_buddy_free(mm, block); + cond_resched(); + } + INIT_LIST_HEAD(objects); +} +EXPORT_SYMBOL(drm_buddy_free_list); + +/** + * drm_buddy_alloc - allocate power-of-two blocks + * + * @mm: DRM buddy manager to allocate from + * @order: size of the allocation + * + * The order value here translates to: + * + * 0 = 2^0 * mm->chunk_size + * 1 = 2^1 * mm->chunk_size + * 2 = 2^2 * mm->chunk_size + * + * Returns: + * allocated ptr to the &drm_buddy_block on success + */ +struct drm_buddy_block * +drm_buddy_alloc(struct drm_buddy_mm *mm, unsigned int order) +{ + struct drm_buddy_block *block = NULL; + unsigned int i; + int err; + + for (i = order; i <= mm->max_order; ++i) { + block = list_first_entry_or_null(&mm->free_list[i], + struct drm_buddy_block, + link); + if (block) + break; + } + + if (!block) + return ERR_PTR(-ENOSPC); + + BUG_ON(!drm_buddy_block_is_free(block)); + + while (i != order) { + err = split_block(mm, block); + if (unlikely(err)) + goto out_free; + + /* Go low */ + block = block->left; + i--; + } + + mark_allocated(block); + mm->avail -= drm_buddy_block_size(mm, block); + kmemleak_update_trace(block); + return block; + +out_free: + if (i != order) + __drm_buddy_free(mm, block); + return ERR_PTR(err); +} +EXPORT_SYMBOL(drm_buddy_alloc); + +static inline bool overlaps(u64 s1, u64 e1, u64 s2, u64 e2) +{ + return s1 <= e2 && e1 >= s2; +} + +static inline bool contains(u64 s1, u64 e1, u64 s2, u64 e2) +{ + return s1 <= s2 && e1 >= e2; +} + +/** + * drm_buddy_alloc_range - allocate range + * + * @mm: DRM buddy manager to allocate from + * @blocks: output list head to add allocated blocks + * @start: start of the allowed range for this block + * @size: size of the allocation + * + * Intended for pre-allocating portions of the address space, for example to + * reserve a block for the initial framebuffer or similar, hence the expectation + * here is that drm_buddy_alloc() is still the main vehicle for + * allocations, so if that's not the case then the drm_mm range allocator is + * probably a much better fit, and so you should probably go use that instead. + * + * Note that it's safe to chain together multiple alloc_ranges + * with the same blocks list + * + * Returns: + * 0 on success, error code on failure. + */ +int drm_buddy_alloc_range(struct drm_buddy_mm *mm, + struct list_head *blocks, + u64 start, u64 size) +{ + struct drm_buddy_block *block; + struct drm_buddy_block *buddy; + LIST_HEAD(allocated); + LIST_HEAD(dfs); + u64 end; + int err; + int i; + + if (size < mm->chunk_size) + return -EINVAL; + + if (!IS_ALIGNED(size | start, mm->chunk_size)) + return -EINVAL; + + if (range_overflows(start, size, mm->size)) + return -EINVAL; + + for (i = 0; i < mm->n_roots; ++i) + list_add_tail(&mm->roots[i]->tmp_link, &dfs); + + end = start + size - 1; + + do { + u64 block_start; + u64 block_end; + + block = list_first_entry_or_null(&dfs, + struct drm_buddy_block, + tmp_link); + if (!block) + break; + + list_del(&block->tmp_link); + + block_start = drm_buddy_block_offset(block); + block_end = block_start + drm_buddy_block_size(mm, block) - 1; + + if (!overlaps(start, end, block_start, block_end)) + continue; + + if (drm_buddy_block_is_allocated(block)) { + err = -ENOSPC; + goto err_free; + } + + if (contains(start, end, block_start, block_end)) { + if (!drm_buddy_block_is_free(block)) { + err = -ENOSPC; + goto err_free; + } + + mark_allocated(block); + mm->avail -= drm_buddy_block_size(mm, block); + list_add_tail(&block->link, &allocated); + continue; + } + + if (!drm_buddy_block_is_split(block)) { + err = split_block(mm, block); + if (unlikely(err)) + goto err_undo; + } + + list_add(&block->right->tmp_link, &dfs); + list_add(&block->left->tmp_link, &dfs); + } while (1); + + list_splice_tail(&allocated, blocks); + return 0; + +err_undo: + /* + * We really don't want to leave around a bunch of split blocks, since + * bigger is better, so make sure we merge everything back before we + * free the allocated blocks. + */ + buddy = get_buddy(block); + if (buddy && + (drm_buddy_block_is_free(block) && + drm_buddy_block_is_free(buddy))) + __drm_buddy_free(mm, block); + +err_free: + drm_buddy_free_list(mm, &allocated); + return err; +} +EXPORT_SYMBOL(drm_buddy_alloc_range); + +/** + * drm_buddy_block_print - print block information + * + * @mm: DRM buddy manager + * @block: DRM buddy block + * @p: DRM printer to use + */ +void drm_buddy_block_print(struct drm_buddy_mm *mm, + struct drm_buddy_block *block, + struct drm_printer *p) +{ + u64 start = drm_buddy_block_offset(block); + u64 size = drm_buddy_block_size(mm, block); + + drm_printf(p, "%#018llx-%#018llx: %llu\n", start, start + size, size); +} +EXPORT_SYMBOL(drm_buddy_block_print); + +/** + * drm_buddy_print - print allocator state + * + * @mm: DRM buddy manager + * @p: DRM printer to use + */ +void drm_buddy_print(struct drm_buddy_mm *mm, struct drm_printer *p) +{ + int order; + + drm_printf(p, "chunk_size: %lluKiB, total: %lluMiB, free: %lluMiB\n", + mm->chunk_size >> 10, mm->size >> 20, mm->avail >> 20); + + for (order = mm->max_order; order >= 0; order--) { + struct drm_buddy_block *block; + u64 count = 0, free; + + list_for_each_entry(block, &mm->free_list[order], link) { + BUG_ON(!drm_buddy_block_is_free(block)); + count++; + } + + drm_printf(p, "order-%d ", order); + + free = count * (mm->chunk_size << order); + if (free < SZ_1M) + drm_printf(p, "free: %lluKiB", free >> 10); + else + drm_printf(p, "free: %lluMiB", free >> 20); + + drm_printf(p, ", pages: %llu\n", count); + } +} +EXPORT_SYMBOL(drm_buddy_print); + +MODULE_DESCRIPTION("DRM Buddy Allocator"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index a4c94dc2e216..64b5e0a44d4c 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -27,6 +27,7 @@ config DRM_I915 select CEC_CORE if CEC_NOTIFIER select VMAP_PFN select DRM_TTM + select DRM_BUDDY help Choose this option if you have a system that has "Intel Graphics Media Accelerator" or "HD Graphics" integrated graphics, diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 3b5857da4123..72c2e9c5e0b3 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -161,7 +161,6 @@ gem-y += \ i915-y += \ $(gem-y) \ i915_active.o \ - i915_buddy.o \ i915_cmd_parser.o \ i915_gem_evict.o \ i915_gem_gtt.o \ diff --git a/drivers/gpu/drm/i915/i915_buddy.c b/drivers/gpu/drm/i915/i915_buddy.c deleted file mode 100644 index 6e2ad68f8f3f..000000000000 --- a/drivers/gpu/drm/i915/i915_buddy.c +++ /dev/null @@ -1,466 +0,0 @@ -// SPDX-License-Identifier: MIT -/* - * Copyright © 2021 Intel Corporation - */ - -#include <linux/kmemleak.h> -#include <linux/sizes.h> - -#include "i915_buddy.h" - -#include "i915_gem.h" -#include "i915_utils.h" - -static struct kmem_cache *slab_blocks; - -static struct i915_buddy_block *i915_block_alloc(struct i915_buddy_mm *mm, - struct i915_buddy_block *parent, - unsigned int order, - u64 offset) -{ - struct i915_buddy_block *block; - - GEM_BUG_ON(order > I915_BUDDY_MAX_ORDER); - - block = kmem_cache_zalloc(slab_blocks, GFP_KERNEL); - if (!block) - return NULL; - - block->header = offset; - block->header |= order; - block->parent = parent; - - GEM_BUG_ON(block->header & I915_BUDDY_HEADER_UNUSED); - return block; -} - -static void i915_block_free(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - kmem_cache_free(slab_blocks, block); -} - -static void mark_allocated(struct i915_buddy_block *block) -{ - block->header &= ~I915_BUDDY_HEADER_STATE; - block->header |= I915_BUDDY_ALLOCATED; - - list_del(&block->link); -} - -static void mark_free(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - block->header &= ~I915_BUDDY_HEADER_STATE; - block->header |= I915_BUDDY_FREE; - - list_add(&block->link, - &mm->free_list[i915_buddy_block_order(block)]); -} - -static void mark_split(struct i915_buddy_block *block) -{ - block->header &= ~I915_BUDDY_HEADER_STATE; - block->header |= I915_BUDDY_SPLIT; - - list_del(&block->link); -} - -int i915_buddy_init(struct i915_buddy_mm *mm, u64 size, u64 chunk_size) -{ - unsigned int i; - u64 offset; - - if (size < chunk_size) - return -EINVAL; - - if (chunk_size < PAGE_SIZE) - return -EINVAL; - - if (!is_power_of_2(chunk_size)) - return -EINVAL; - - size = round_down(size, chunk_size); - - mm->size = size; - mm->avail = size; - mm->chunk_size = chunk_size; - mm->max_order = ilog2(size) - ilog2(chunk_size); - - GEM_BUG_ON(mm->max_order > I915_BUDDY_MAX_ORDER); - - mm->free_list = kmalloc_array(mm->max_order + 1, - sizeof(struct list_head), - GFP_KERNEL); - if (!mm->free_list) - return -ENOMEM; - - for (i = 0; i <= mm->max_order; ++i) - INIT_LIST_HEAD(&mm->free_list[i]); - - mm->n_roots = hweight64(size); - - mm->roots = kmalloc_array(mm->n_roots, - sizeof(struct i915_buddy_block *), - GFP_KERNEL); - if (!mm->roots) - goto out_free_list; - - offset = 0; - i = 0; - - /* - * Split into power-of-two blocks, in case we are given a size that is - * not itself a power-of-two. - */ - do { - struct i915_buddy_block *root; - unsigned int order; - u64 root_size; - - root_size = rounddown_pow_of_two(size); - order = ilog2(root_size) - ilog2(chunk_size); - - root = i915_block_alloc(mm, NULL, order, offset); - if (!root) - goto out_free_roots; - - mark_free(mm, root); - - GEM_BUG_ON(i > mm->max_order); - GEM_BUG_ON(i915_buddy_block_size(mm, root) < chunk_size); - - mm->roots[i] = root; - - offset += root_size; - size -= root_size; - i++; - } while (size); - - return 0; - -out_free_roots: - while (i--) - i915_block_free(mm, mm->roots[i]); - kfree(mm->roots); -out_free_list: - kfree(mm->free_list); - return -ENOMEM; -} - -void i915_buddy_fini(struct i915_buddy_mm *mm) -{ - int i; - - for (i = 0; i < mm->n_roots; ++i) { - GEM_WARN_ON(!i915_buddy_block_is_free(mm->roots[i])); - i915_block_free(mm, mm->roots[i]); - } - - GEM_WARN_ON(mm->avail != mm->size); - - kfree(mm->roots); - kfree(mm->free_list); -} - -static int split_block(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - unsigned int block_order = i915_buddy_block_order(block) - 1; - u64 offset = i915_buddy_block_offset(block); - - GEM_BUG_ON(!i915_buddy_block_is_free(block)); - GEM_BUG_ON(!i915_buddy_block_order(block)); - - block->left = i915_block_alloc(mm, block, block_order, offset); - if (!block->left) - return -ENOMEM; - - block->right = i915_block_alloc(mm, block, block_order, - offset + (mm->chunk_size << block_order)); - if (!block->right) { - i915_block_free(mm, block->left); - return -ENOMEM; - } - - mark_free(mm, block->left); - mark_free(mm, block->right); - - mark_split(block); - - return 0; -} - -static struct i915_buddy_block * -get_buddy(struct i915_buddy_block *block) -{ - struct i915_buddy_block *parent; - - parent = block->parent; - if (!parent) - return NULL; - - if (parent->left == block) - return parent->right; - - return parent->left; -} - -static void __i915_buddy_free(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - struct i915_buddy_block *parent; - - while ((parent = block->parent)) { - struct i915_buddy_block *buddy; - - buddy = get_buddy(block); - - if (!i915_buddy_block_is_free(buddy)) - break; - - list_del(&buddy->link); - - i915_block_free(mm, block); - i915_block_free(mm, buddy); - - block = parent; - } - - mark_free(mm, block); -} - -void i915_buddy_free(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - GEM_BUG_ON(!i915_buddy_block_is_allocated(block)); - mm->avail += i915_buddy_block_size(mm, block); - __i915_buddy_free(mm, block); -} - -void i915_buddy_free_list(struct i915_buddy_mm *mm, struct list_head *objects) -{ - struct i915_buddy_block *block, *on; - - list_for_each_entry_safe(block, on, objects, link) { - i915_buddy_free(mm, block); - cond_resched(); - } - INIT_LIST_HEAD(objects); -} - -/* - * Allocate power-of-two block. The order value here translates to: - * - * 0 = 2^0 * mm->chunk_size - * 1 = 2^1 * mm->chunk_size - * 2 = 2^2 * mm->chunk_size - * ... - */ -struct i915_buddy_block * -i915_buddy_alloc(struct i915_buddy_mm *mm, unsigned int order) -{ - struct i915_buddy_block *block = NULL; - unsigned int i; - int err; - - for (i = order; i <= mm->max_order; ++i) { - block = list_first_entry_or_null(&mm->free_list[i], - struct i915_buddy_block, - link); - if (block) - break; - } - - if (!block) - return ERR_PTR(-ENOSPC); - - GEM_BUG_ON(!i915_buddy_block_is_free(block)); - - while (i != order) { - err = split_block(mm, block); - if (unlikely(err)) - goto out_free; - - /* Go low */ - block = block->left; - i--; - } - - mark_allocated(block); - mm->avail -= i915_buddy_block_size(mm, block); - kmemleak_update_trace(block); - return block; - -out_free: - if (i != order) - __i915_buddy_free(mm, block); - return ERR_PTR(err); -} - -static inline bool overlaps(u64 s1, u64 e1, u64 s2, u64 e2) -{ - return s1 <= e2 && e1 >= s2; -} - -static inline bool contains(u64 s1, u64 e1, u64 s2, u64 e2) -{ - return s1 <= s2 && e1 >= e2; -} - -/* - * Allocate range. Note that it's safe to chain together multiple alloc_ranges - * with the same blocks list. - * - * Intended for pre-allocating portions of the address space, for example to - * reserve a block for the initial framebuffer or similar, hence the expectation - * here is that i915_buddy_alloc() is still the main vehicle for - * allocations, so if that's not the case then the drm_mm range allocator is - * probably a much better fit, and so you should probably go use that instead. - */ -int i915_buddy_alloc_range(struct i915_buddy_mm *mm, - struct list_head *blocks, - u64 start, u64 size) -{ - struct i915_buddy_block *block; - struct i915_buddy_block *buddy; - LIST_HEAD(allocated); - LIST_HEAD(dfs); - u64 end; - int err; - int i; - - if (size < mm->chunk_size) - return -EINVAL; - - if (!IS_ALIGNED(size | start, mm->chunk_size)) - return -EINVAL; - - if (range_overflows(start, size, mm->size)) - return -EINVAL; - - for (i = 0; i < mm->n_roots; ++i) - list_add_tail(&mm->roots[i]->tmp_link, &dfs); - - end = start + size - 1; - - do { - u64 block_start; - u64 block_end; - - block = list_first_entry_or_null(&dfs, - struct i915_buddy_block, - tmp_link); - if (!block) - break; - - list_del(&block->tmp_link); - - block_start = i915_buddy_block_offset(block); - block_end = block_start + i915_buddy_block_size(mm, block) - 1; - - if (!overlaps(start, end, block_start, block_end)) - continue; - - if (i915_buddy_block_is_allocated(block)) { - err = -ENOSPC; - goto err_free; - } - - if (contains(start, end, block_start, block_end)) { - if (!i915_buddy_block_is_free(block)) { - err = -ENOSPC; - goto err_free; - } - - mark_allocated(block); - mm->avail -= i915_buddy_block_size(mm, block); - list_add_tail(&block->link, &allocated); - continue; - } - - if (!i915_buddy_block_is_split(block)) { - err = split_block(mm, block); - if (unlikely(err)) - goto err_undo; - } - - list_add(&block->right->tmp_link, &dfs); - list_add(&block->left->tmp_link, &dfs); - } while (1); - - list_splice_tail(&allocated, blocks); - return 0; - -err_undo: - /* - * We really don't want to leave around a bunch of split blocks, since - * bigger is better, so make sure we merge everything back before we - * free the allocated blocks. - */ - buddy = get_buddy(block); - if (buddy && - (i915_buddy_block_is_free(block) && - i915_buddy_block_is_free(buddy))) - __i915_buddy_free(mm, block); - -err_free: - i915_buddy_free_list(mm, &allocated); - return err; -} - -void i915_buddy_block_print(struct i915_buddy_mm *mm, - struct i915_buddy_block *block, - struct drm_printer *p) -{ - u64 start = i915_buddy_block_offset(block); - u64 size = i915_buddy_block_size(mm, block); - - drm_printf(p, "%#018llx-%#018llx: %llu\n", start, start + size, size); -} - -void i915_buddy_print(struct i915_buddy_mm *mm, struct drm_printer *p) -{ - int order; - - drm_printf(p, "chunk_size: %lluKiB, total: %lluMiB, free: %lluMiB\n", - mm->chunk_size >> 10, mm->size >> 20, mm->avail >> 20); - - for (order = mm->max_order; order >= 0; order--) { - struct i915_buddy_block *block; - u64 count = 0, free; - - list_for_each_entry(block, &mm->free_list[order], link) { - GEM_BUG_ON(!i915_buddy_block_is_free(block)); - count++; - } - - drm_printf(p, "order-%d ", order); - - free = count * (mm->chunk_size << order); - if (free < SZ_1M) - drm_printf(p, "free: %lluKiB", free >> 10); - else - drm_printf(p, "free: %lluMiB", free >> 20); - - drm_printf(p, ", pages: %llu\n", count); - } -} - -#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) -#include "selftests/i915_buddy.c" -#endif - -void i915_buddy_module_exit(void) -{ - kmem_cache_destroy(slab_blocks); -} - -int __init i915_buddy_module_init(void) -{ - slab_blocks = KMEM_CACHE(i915_buddy_block, 0); - if (!slab_blocks) - return -ENOMEM; - - return 0; -} diff --git a/drivers/gpu/drm/i915/i915_buddy.h b/drivers/gpu/drm/i915/i915_buddy.h deleted file mode 100644 index 7077742112ac..000000000000 --- a/drivers/gpu/drm/i915/i915_buddy.h +++ /dev/null @@ -1,143 +0,0 @@ -/* SPDX-License-Identifier: MIT */ -/* - * Copyright © 2021 Intel Corporation - */ - -#ifndef __I915_BUDDY_H__ -#define __I915_BUDDY_H__ - -#include <linux/bitops.h> -#include <linux/list.h> -#include <linux/slab.h> - -#include <drm/drm_print.h> - -struct i915_buddy_block { -#define I915_BUDDY_HEADER_OFFSET GENMASK_ULL(63, 12) -#define I915_BUDDY_HEADER_STATE GENMASK_ULL(11, 10) -#define I915_BUDDY_ALLOCATED (1 << 10) -#define I915_BUDDY_FREE (2 << 10) -#define I915_BUDDY_SPLIT (3 << 10) -/* Free to be used, if needed in the future */ -#define I915_BUDDY_HEADER_UNUSED GENMASK_ULL(9, 6) -#define I915_BUDDY_HEADER_ORDER GENMASK_ULL(5, 0) - u64 header; - - struct i915_buddy_block *left; - struct i915_buddy_block *right; - struct i915_buddy_block *parent; - - void *private; /* owned by creator */ - - /* - * While the block is allocated by the user through i915_buddy_alloc*, - * the user has ownership of the link, for example to maintain within - * a list, if so desired. As soon as the block is freed with - * i915_buddy_free* ownership is given back to the mm. - */ - struct list_head link; - struct list_head tmp_link; -}; - -/* Order-zero must be at least PAGE_SIZE */ -#define I915_BUDDY_MAX_ORDER (63 - PAGE_SHIFT) - -/* - * Binary Buddy System. - * - * Locking should be handled by the user, a simple mutex around - * i915_buddy_alloc* and i915_buddy_free* should suffice. - */ -struct i915_buddy_mm { - /* Maintain a free list for each order. */ - struct list_head *free_list; - - /* - * Maintain explicit binary tree(s) to track the allocation of the - * address space. This gives us a simple way of finding a buddy block - * and performing the potentially recursive merge step when freeing a - * block. Nodes are either allocated or free, in which case they will - * also exist on the respective free list. - */ - struct i915_buddy_block **roots; - - /* - * Anything from here is public, and remains static for the lifetime of - * the mm. Everything above is considered do-not-touch. - */ - unsigned int n_roots; - unsigned int max_order; - - /* Must be at least PAGE_SIZE */ - u64 chunk_size; - u64 size; - u64 avail; -}; - -static inline u64 -i915_buddy_block_offset(struct i915_buddy_block *block) -{ - return block->header & I915_BUDDY_HEADER_OFFSET; -} - -static inline unsigned int -i915_buddy_block_order(struct i915_buddy_block *block) -{ - return block->header & I915_BUDDY_HEADER_ORDER; -} - -static inline unsigned int -i915_buddy_block_state(struct i915_buddy_block *block) -{ - return block->header & I915_BUDDY_HEADER_STATE; -} - -static inline bool -i915_buddy_block_is_allocated(struct i915_buddy_block *block) -{ - return i915_buddy_block_state(block) == I915_BUDDY_ALLOCATED; -} - -static inline bool -i915_buddy_block_is_free(struct i915_buddy_block *block) -{ - return i915_buddy_block_state(block) == I915_BUDDY_FREE; -} - -static inline bool -i915_buddy_block_is_split(struct i915_buddy_block *block) -{ - return i915_buddy_block_state(block) == I915_BUDDY_SPLIT; -} - -static inline u64 -i915_buddy_block_size(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - return mm->chunk_size << i915_buddy_block_order(block); -} - -int i915_buddy_init(struct i915_buddy_mm *mm, u64 size, u64 chunk_size); - -void i915_buddy_fini(struct i915_buddy_mm *mm); - -struct i915_buddy_block * -i915_buddy_alloc(struct i915_buddy_mm *mm, unsigned int order); - -int i915_buddy_alloc_range(struct i915_buddy_mm *mm, - struct list_head *blocks, - u64 start, u64 size); - -void i915_buddy_free(struct i915_buddy_mm *mm, struct i915_buddy_block *block); - -void i915_buddy_free_list(struct i915_buddy_mm *mm, struct list_head *objects); - -void i915_buddy_print(struct i915_buddy_mm *mm, struct drm_printer *p); -void i915_buddy_block_print(struct i915_buddy_mm *mm, - struct i915_buddy_block *block, - struct drm_printer *p); - -void i915_buddy_module_exit(void); -int i915_buddy_module_init(void); - -#endif diff --git a/drivers/gpu/drm/i915/i915_module.c b/drivers/gpu/drm/i915/i915_module.c index f6bcd2f89257..8451822637f0 100644 --- a/drivers/gpu/drm/i915/i915_module.c +++ b/drivers/gpu/drm/i915/i915_module.c @@ -9,7 +9,6 @@ #include "gem/i915_gem_context.h" #include "gem/i915_gem_object.h" #include "i915_active.h" -#include "i915_buddy.h" #include "i915_params.h" #include "i915_pci.h" #include "i915_perf.h" @@ -50,8 +49,6 @@ static const struct { { .init = i915_check_nomodeset }, { .init = i915_active_module_init, .exit = i915_active_module_exit }, - { .init = i915_buddy_module_init, - .exit = i915_buddy_module_exit }, { .init = i915_context_module_init, .exit = i915_context_module_exit }, { .init = i915_gem_context_module_init, diff --git a/drivers/gpu/drm/i915/i915_scatterlist.c b/drivers/gpu/drm/i915/i915_scatterlist.c index 41f2adb6a583..bef01bbece15 100644 --- a/drivers/gpu/drm/i915/i915_scatterlist.c +++ b/drivers/gpu/drm/i915/i915_scatterlist.c @@ -5,10 +5,9 @@ */
#include "i915_scatterlist.h" - -#include "i915_buddy.h" #include "i915_ttm_buddy_manager.h"
+#include <drm/drm_buddy.h> #include <drm/drm_mm.h>
#include <linux/slab.h> @@ -153,9 +152,9 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res, struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res); const u64 size = res->num_pages << PAGE_SHIFT; const u64 max_segment = rounddown(UINT_MAX, PAGE_SIZE); - struct i915_buddy_mm *mm = bman_res->mm; + struct drm_buddy_mm *mm = bman_res->mm; struct list_head *blocks = &bman_res->blocks; - struct i915_buddy_block *block; + struct drm_buddy_block *block; struct i915_refct_sgt *rsgt; struct scatterlist *sg; struct sg_table *st; @@ -181,8 +180,8 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res, list_for_each_entry(block, blocks, link) { u64 block_size, offset;
- block_size = min_t(u64, size, i915_buddy_block_size(mm, block)); - offset = i915_buddy_block_offset(block); + block_size = min_t(u64, size, drm_buddy_block_size(mm, block)); + offset = drm_buddy_block_offset(block);
while (block_size) { u64 len; diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c index d59fbb019032..c4b70cb8c248 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c @@ -8,14 +8,15 @@ #include <drm/ttm/ttm_bo_driver.h> #include <drm/ttm/ttm_placement.h>
+#include <drm/drm_buddy.h> + #include "i915_ttm_buddy_manager.h"
-#include "i915_buddy.h" #include "i915_gem.h"
struct i915_ttm_buddy_manager { struct ttm_resource_manager manager; - struct i915_buddy_mm mm; + struct drm_buddy_mm mm; struct list_head reserved; struct mutex lock; u64 default_page_size; @@ -34,7 +35,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, { struct i915_ttm_buddy_manager *bman = to_buddy_manager(man); struct i915_ttm_buddy_resource *bman_res; - struct i915_buddy_mm *mm = &bman->mm; + struct drm_buddy_mm *mm = &bman->mm; unsigned long n_pages; unsigned int min_order; u64 min_page_size; @@ -73,7 +74,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, n_pages = size >> ilog2(mm->chunk_size);
do { - struct i915_buddy_block *block; + struct drm_buddy_block *block; unsigned int order;
order = fls(n_pages) - 1; @@ -82,7 +83,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
do { mutex_lock(&bman->lock); - block = i915_buddy_alloc(mm, order); + block = drm_buddy_alloc(mm, order); mutex_unlock(&bman->lock); if (!IS_ERR(block)) break; @@ -106,7 +107,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
err_free_blocks: mutex_lock(&bman->lock); - i915_buddy_free_list(mm, &bman_res->blocks); + drm_buddy_free_list(mm, &bman_res->blocks); mutex_unlock(&bman->lock); err_free_res: kfree(bman_res); @@ -120,7 +121,7 @@ static void i915_ttm_buddy_man_free(struct ttm_resource_manager *man, struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
mutex_lock(&bman->lock); - i915_buddy_free_list(&bman->mm, &bman_res->blocks); + drm_buddy_free_list(&bman->mm, &bman_res->blocks); mutex_unlock(&bman->lock);
kfree(bman_res); @@ -130,17 +131,17 @@ static void i915_ttm_buddy_man_debug(struct ttm_resource_manager *man, struct drm_printer *printer) { struct i915_ttm_buddy_manager *bman = to_buddy_manager(man); - struct i915_buddy_block *block; + struct drm_buddy_block *block;
mutex_lock(&bman->lock); drm_printf(printer, "default_page_size: %lluKiB\n", bman->default_page_size >> 10);
- i915_buddy_print(&bman->mm, printer); + drm_buddy_print(&bman->mm, printer);
drm_printf(printer, "reserved:\n"); list_for_each_entry(block, &bman->reserved, link) - i915_buddy_block_print(&bman->mm, block, printer); + drm_buddy_block_print(&bman->mm, block, printer); mutex_unlock(&bman->lock); }
@@ -190,7 +191,7 @@ int i915_ttm_buddy_man_init(struct ttm_device *bdev, if (!bman) return -ENOMEM;
- err = i915_buddy_init(&bman->mm, size, chunk_size); + err = drm_buddy_init(&bman->mm, size, chunk_size); if (err) goto err_free_bman;
@@ -228,7 +229,7 @@ int i915_ttm_buddy_man_fini(struct ttm_device *bdev, unsigned int type) { struct ttm_resource_manager *man = ttm_manager_type(bdev, type); struct i915_ttm_buddy_manager *bman = to_buddy_manager(man); - struct i915_buddy_mm *mm = &bman->mm; + struct drm_buddy_mm *mm = &bman->mm; int ret;
ttm_resource_manager_set_used(man, false); @@ -240,8 +241,8 @@ int i915_ttm_buddy_man_fini(struct ttm_device *bdev, unsigned int type) ttm_set_driver_manager(bdev, type, NULL);
mutex_lock(&bman->lock); - i915_buddy_free_list(mm, &bman->reserved); - i915_buddy_fini(mm); + drm_buddy_free_list(mm, &bman->reserved); + drm_buddy_fini(mm); mutex_unlock(&bman->lock);
ttm_resource_manager_cleanup(man); @@ -264,11 +265,11 @@ int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man, u64 start, u64 size) { struct i915_ttm_buddy_manager *bman = to_buddy_manager(man); - struct i915_buddy_mm *mm = &bman->mm; + struct drm_buddy_mm *mm = &bman->mm; int ret;
mutex_lock(&bman->lock); - ret = i915_buddy_alloc_range(mm, &bman->reserved, start, size); + ret = drm_buddy_alloc_range(mm, &bman->reserved, start, size); mutex_unlock(&bman->lock);
return ret; diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h index 0722d33f3e14..fa644b512c2e 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h @@ -13,7 +13,7 @@
struct ttm_device; struct ttm_resource_manager; -struct i915_buddy_mm; +struct drm_buddy_mm;
/** * struct i915_ttm_buddy_resource @@ -28,7 +28,7 @@ struct i915_buddy_mm; struct i915_ttm_buddy_resource { struct ttm_resource base; struct list_head blocks; - struct i915_buddy_mm *mm; + struct drm_buddy_mm *mm; };
/** diff --git a/drivers/gpu/drm/i915/selftests/i915_buddy.c b/drivers/gpu/drm/i915/selftests/i915_buddy.c deleted file mode 100644 index d61ec9c951bf..000000000000 --- a/drivers/gpu/drm/i915/selftests/i915_buddy.c +++ /dev/null @@ -1,787 +0,0 @@ -// SPDX-License-Identifier: MIT -/* - * Copyright © 2019 Intel Corporation - */ - -#include <linux/prime_numbers.h> - -#include "../i915_selftest.h" -#include "i915_random.h" - -static void __igt_dump_block(struct i915_buddy_mm *mm, - struct i915_buddy_block *block, - bool buddy) -{ - pr_err("block info: header=%llx, state=%u, order=%d, offset=%llx size=%llx root=%s buddy=%s\n", - block->header, - i915_buddy_block_state(block), - i915_buddy_block_order(block), - i915_buddy_block_offset(block), - i915_buddy_block_size(mm, block), - yesno(!block->parent), - yesno(buddy)); -} - -static void igt_dump_block(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - struct i915_buddy_block *buddy; - - __igt_dump_block(mm, block, false); - - buddy = get_buddy(block); - if (buddy) - __igt_dump_block(mm, buddy, true); -} - -static int igt_check_block(struct i915_buddy_mm *mm, - struct i915_buddy_block *block) -{ - struct i915_buddy_block *buddy; - unsigned int block_state; - u64 block_size; - u64 offset; - int err = 0; - - block_state = i915_buddy_block_state(block); - - if (block_state != I915_BUDDY_ALLOCATED && - block_state != I915_BUDDY_FREE && - block_state != I915_BUDDY_SPLIT) { - pr_err("block state mismatch\n"); - err = -EINVAL; - } - - block_size = i915_buddy_block_size(mm, block); - offset = i915_buddy_block_offset(block); - - if (block_size < mm->chunk_size) { - pr_err("block size smaller than min size\n"); - err = -EINVAL; - } - - if (!is_power_of_2(block_size)) { - pr_err("block size not power of two\n"); - err = -EINVAL; - } - - if (!IS_ALIGNED(block_size, mm->chunk_size)) { - pr_err("block size not aligned to min size\n"); - err = -EINVAL; - } - - if (!IS_ALIGNED(offset, mm->chunk_size)) { - pr_err("block offset not aligned to min size\n"); - err = -EINVAL; - } - - if (!IS_ALIGNED(offset, block_size)) { - pr_err("block offset not aligned to block size\n"); - err = -EINVAL; - } - - buddy = get_buddy(block); - - if (!buddy && block->parent) { - pr_err("buddy has gone fishing\n"); - err = -EINVAL; - } - - if (buddy) { - if (i915_buddy_block_offset(buddy) != (offset ^ block_size)) { - pr_err("buddy has wrong offset\n"); - err = -EINVAL; - } - - if (i915_buddy_block_size(mm, buddy) != block_size) { - pr_err("buddy size mismatch\n"); - err = -EINVAL; - } - - if (i915_buddy_block_state(buddy) == block_state && - block_state == I915_BUDDY_FREE) { - pr_err("block and its buddy are free\n"); - err = -EINVAL; - } - } - - return err; -} - -static int igt_check_blocks(struct i915_buddy_mm *mm, - struct list_head *blocks, - u64 expected_size, - bool is_contiguous) -{ - struct i915_buddy_block *block; - struct i915_buddy_block *prev; - u64 total; - int err = 0; - - block = NULL; - prev = NULL; - total = 0; - - list_for_each_entry(block, blocks, link) { - err = igt_check_block(mm, block); - - if (!i915_buddy_block_is_allocated(block)) { - pr_err("block not allocated\n"), - err = -EINVAL; - } - - if (is_contiguous && prev) { - u64 prev_block_size; - u64 prev_offset; - u64 offset; - - prev_offset = i915_buddy_block_offset(prev); - prev_block_size = i915_buddy_block_size(mm, prev); - offset = i915_buddy_block_offset(block); - - if (offset != (prev_offset + prev_block_size)) { - pr_err("block offset mismatch\n"); - err = -EINVAL; - } - } - - if (err) - break; - - total += i915_buddy_block_size(mm, block); - prev = block; - } - - if (!err) { - if (total != expected_size) { - pr_err("size mismatch, expected=%llx, found=%llx\n", - expected_size, total); - err = -EINVAL; - } - return err; - } - - if (prev) { - pr_err("prev block, dump:\n"); - igt_dump_block(mm, prev); - } - - pr_err("bad block, dump:\n"); - igt_dump_block(mm, block); - - return err; -} - -static int igt_check_mm(struct i915_buddy_mm *mm) -{ - struct i915_buddy_block *root; - struct i915_buddy_block *prev; - unsigned int i; - u64 total; - int err = 0; - - if (!mm->n_roots) { - pr_err("n_roots is zero\n"); - return -EINVAL; - } - - if (mm->n_roots != hweight64(mm->size)) { - pr_err("n_roots mismatch, n_roots=%u, expected=%lu\n", - mm->n_roots, hweight64(mm->size)); - return -EINVAL; - } - - root = NULL; - prev = NULL; - total = 0; - - for (i = 0; i < mm->n_roots; ++i) { - struct i915_buddy_block *block; - unsigned int order; - - root = mm->roots[i]; - if (!root) { - pr_err("root(%u) is NULL\n", i); - err = -EINVAL; - break; - } - - err = igt_check_block(mm, root); - - if (!i915_buddy_block_is_free(root)) { - pr_err("root not free\n"); - err = -EINVAL; - } - - order = i915_buddy_block_order(root); - - if (!i) { - if (order != mm->max_order) { - pr_err("max order root missing\n"); - err = -EINVAL; - } - } - - if (prev) { - u64 prev_block_size; - u64 prev_offset; - u64 offset; - - prev_offset = i915_buddy_block_offset(prev); - prev_block_size = i915_buddy_block_size(mm, prev); - offset = i915_buddy_block_offset(root); - - if (offset != (prev_offset + prev_block_size)) { - pr_err("root offset mismatch\n"); - err = -EINVAL; - } - } - - block = list_first_entry_or_null(&mm->free_list[order], - struct i915_buddy_block, - link); - if (block != root) { - pr_err("root mismatch at order=%u\n", order); - err = -EINVAL; - } - - if (err) - break; - - prev = root; - total += i915_buddy_block_size(mm, root); - } - - if (!err) { - if (total != mm->size) { - pr_err("expected mm size=%llx, found=%llx\n", mm->size, - total); - err = -EINVAL; - } - return err; - } - - if (prev) { - pr_err("prev root(%u), dump:\n", i - 1); - igt_dump_block(mm, prev); - } - - if (root) { - pr_err("bad root(%u), dump:\n", i); - igt_dump_block(mm, root); - } - - return err; -} - -static void igt_mm_config(u64 *size, u64 *chunk_size) -{ - I915_RND_STATE(prng); - u32 s, ms; - - /* Nothing fancy, just try to get an interesting bit pattern */ - - prandom_seed_state(&prng, i915_selftest.random_seed); - - /* Let size be a random number of pages up to 8 GB (2M pages) */ - s = 1 + i915_prandom_u32_max_state((BIT(33 - 12)) - 1, &prng); - /* Let the chunk size be a random power of 2 less than size */ - ms = BIT(i915_prandom_u32_max_state(ilog2(s), &prng)); - /* Round size down to the chunk size */ - s &= -ms; - - /* Convert from pages to bytes */ - *chunk_size = (u64)ms << 12; - *size = (u64)s << 12; -} - -static int igt_buddy_alloc_smoke(void *arg) -{ - struct i915_buddy_mm mm; - IGT_TIMEOUT(end_time); - I915_RND_STATE(prng); - u64 chunk_size; - u64 mm_size; - int *order; - int err, i; - - igt_mm_config(&mm_size, &chunk_size); - - pr_info("buddy_init with size=%llx, chunk_size=%llx\n", mm_size, chunk_size); - - err = i915_buddy_init(&mm, mm_size, chunk_size); - if (err) { - pr_err("buddy_init failed(%d)\n", err); - return err; - } - - order = i915_random_order(mm.max_order + 1, &prng); - if (!order) - goto out_fini; - - for (i = 0; i <= mm.max_order; ++i) { - struct i915_buddy_block *block; - int max_order = order[i]; - bool timeout = false; - LIST_HEAD(blocks); - int order; - u64 total; - - err = igt_check_mm(&mm); - if (err) { - pr_err("pre-mm check failed, abort\n"); - break; - } - - pr_info("filling from max_order=%u\n", max_order); - - order = max_order; - total = 0; - - do { -retry: - block = i915_buddy_alloc(&mm, order); - if (IS_ERR(block)) { - err = PTR_ERR(block); - if (err == -ENOMEM) { - pr_info("buddy_alloc hit -ENOMEM with order=%d\n", - order); - } else { - if (order--) { - err = 0; - goto retry; - } - - pr_err("buddy_alloc with order=%d failed(%d)\n", - order, err); - } - - break; - } - - list_add_tail(&block->link, &blocks); - - if (i915_buddy_block_order(block) != order) { - pr_err("buddy_alloc order mismatch\n"); - err = -EINVAL; - break; - } - - total += i915_buddy_block_size(&mm, block); - - if (__igt_timeout(end_time, NULL)) { - timeout = true; - break; - } - } while (total < mm.size); - - if (!err) - err = igt_check_blocks(&mm, &blocks, total, false); - - i915_buddy_free_list(&mm, &blocks); - - if (!err) { - err = igt_check_mm(&mm); - if (err) - pr_err("post-mm check failed\n"); - } - - if (err || timeout) - break; - - cond_resched(); - } - - if (err == -ENOMEM) - err = 0; - - kfree(order); -out_fini: - i915_buddy_fini(&mm); - - return err; -} - -static int igt_buddy_alloc_pessimistic(void *arg) -{ - const unsigned int max_order = 16; - struct i915_buddy_block *block, *bn; - struct i915_buddy_mm mm; - unsigned int order; - LIST_HEAD(blocks); - int err; - - /* - * Create a pot-sized mm, then allocate one of each possible - * order within. This should leave the mm with exactly one - * page left. - */ - - err = i915_buddy_init(&mm, PAGE_SIZE << max_order, PAGE_SIZE); - if (err) { - pr_err("buddy_init failed(%d)\n", err); - return err; - } - GEM_BUG_ON(mm.max_order != max_order); - - for (order = 0; order < max_order; order++) { - block = i915_buddy_alloc(&mm, order); - if (IS_ERR(block)) { - pr_info("buddy_alloc hit -ENOMEM with order=%d\n", - order); - err = PTR_ERR(block); - goto err; - } - - list_add_tail(&block->link, &blocks); - } - - /* And now the last remaining block available */ - block = i915_buddy_alloc(&mm, 0); - if (IS_ERR(block)) { - pr_info("buddy_alloc hit -ENOMEM on final alloc\n"); - err = PTR_ERR(block); - goto err; - } - list_add_tail(&block->link, &blocks); - - /* Should be completely full! */ - for (order = max_order; order--; ) { - block = i915_buddy_alloc(&mm, order); - if (!IS_ERR(block)) { - pr_info("buddy_alloc unexpectedly succeeded at order %d, it should be full!", - order); - list_add_tail(&block->link, &blocks); - err = -EINVAL; - goto err; - } - } - - block = list_last_entry(&blocks, typeof(*block), link); - list_del(&block->link); - i915_buddy_free(&mm, block); - - /* As we free in increasing size, we make available larger blocks */ - order = 1; - list_for_each_entry_safe(block, bn, &blocks, link) { - list_del(&block->link); - i915_buddy_free(&mm, block); - - block = i915_buddy_alloc(&mm, order); - if (IS_ERR(block)) { - pr_info("buddy_alloc (realloc) hit -ENOMEM with order=%d\n", - order); - err = PTR_ERR(block); - goto err; - } - i915_buddy_free(&mm, block); - order++; - } - - /* To confirm, now the whole mm should be available */ - block = i915_buddy_alloc(&mm, max_order); - if (IS_ERR(block)) { - pr_info("buddy_alloc (realloc) hit -ENOMEM with order=%d\n", - max_order); - err = PTR_ERR(block); - goto err; - } - i915_buddy_free(&mm, block); - -err: - i915_buddy_free_list(&mm, &blocks); - i915_buddy_fini(&mm); - return err; -} - -static int igt_buddy_alloc_optimistic(void *arg) -{ - const int max_order = 16; - struct i915_buddy_block *block; - struct i915_buddy_mm mm; - LIST_HEAD(blocks); - int order; - int err; - - /* - * Create a mm with one block of each order available, and - * try to allocate them all. - */ - - err = i915_buddy_init(&mm, - PAGE_SIZE * ((1 << (max_order + 1)) - 1), - PAGE_SIZE); - if (err) { - pr_err("buddy_init failed(%d)\n", err); - return err; - } - GEM_BUG_ON(mm.max_order != max_order); - - for (order = 0; order <= max_order; order++) { - block = i915_buddy_alloc(&mm, order); - if (IS_ERR(block)) { - pr_info("buddy_alloc hit -ENOMEM with order=%d\n", - order); - err = PTR_ERR(block); - goto err; - } - - list_add_tail(&block->link, &blocks); - } - - /* Should be completely full! */ - block = i915_buddy_alloc(&mm, 0); - if (!IS_ERR(block)) { - pr_info("buddy_alloc unexpectedly succeeded, it should be full!"); - list_add_tail(&block->link, &blocks); - err = -EINVAL; - goto err; - } - -err: - i915_buddy_free_list(&mm, &blocks); - i915_buddy_fini(&mm); - return err; -} - -static int igt_buddy_alloc_pathological(void *arg) -{ - const int max_order = 16; - struct i915_buddy_block *block; - struct i915_buddy_mm mm; - LIST_HEAD(blocks); - LIST_HEAD(holes); - int order, top; - int err; - - /* - * Create a pot-sized mm, then allocate one of each possible - * order within. This should leave the mm with exactly one - * page left. Free the largest block, then whittle down again. - * Eventually we will have a fully 50% fragmented mm. - */ - - err = i915_buddy_init(&mm, PAGE_SIZE << max_order, PAGE_SIZE); - if (err) { - pr_err("buddy_init failed(%d)\n", err); - return err; - } - GEM_BUG_ON(mm.max_order != max_order); - - for (top = max_order; top; top--) { - /* Make room by freeing the largest allocated block */ - block = list_first_entry_or_null(&blocks, typeof(*block), link); - if (block) { - list_del(&block->link); - i915_buddy_free(&mm, block); - } - - for (order = top; order--; ) { - block = i915_buddy_alloc(&mm, order); - if (IS_ERR(block)) { - pr_info("buddy_alloc hit -ENOMEM with order=%d, top=%d\n", - order, top); - err = PTR_ERR(block); - goto err; - } - list_add_tail(&block->link, &blocks); - } - - /* There should be one final page for this sub-allocation */ - block = i915_buddy_alloc(&mm, 0); - if (IS_ERR(block)) { - pr_info("buddy_alloc hit -ENOMEM for hole\n"); - err = PTR_ERR(block); - goto err; - } - list_add_tail(&block->link, &holes); - - block = i915_buddy_alloc(&mm, top); - if (!IS_ERR(block)) { - pr_info("buddy_alloc unexpectedly succeeded at top-order %d/%d, it should be full!", - top, max_order); - list_add_tail(&block->link, &blocks); - err = -EINVAL; - goto err; - } - } - - i915_buddy_free_list(&mm, &holes); - - /* Nothing larger than blocks of chunk_size now available */ - for (order = 1; order <= max_order; order++) { - block = i915_buddy_alloc(&mm, order); - if (!IS_ERR(block)) { - pr_info("buddy_alloc unexpectedly succeeded at order %d, it should be full!", - order); - list_add_tail(&block->link, &blocks); - err = -EINVAL; - goto err; - } - } - -err: - list_splice_tail(&holes, &blocks); - i915_buddy_free_list(&mm, &blocks); - i915_buddy_fini(&mm); - return err; -} - -static int igt_buddy_alloc_range(void *arg) -{ - struct i915_buddy_mm mm; - unsigned long page_num; - LIST_HEAD(blocks); - u64 chunk_size; - u64 offset; - u64 size; - u64 rem; - int err; - - igt_mm_config(&size, &chunk_size); - - pr_info("buddy_init with size=%llx, chunk_size=%llx\n", size, chunk_size); - - err = i915_buddy_init(&mm, size, chunk_size); - if (err) { - pr_err("buddy_init failed(%d)\n", err); - return err; - } - - err = igt_check_mm(&mm); - if (err) { - pr_err("pre-mm check failed, abort, abort, abort!\n"); - goto err_fini; - } - - rem = mm.size; - offset = 0; - - for_each_prime_number_from(page_num, 1, ULONG_MAX - 1) { - struct i915_buddy_block *block; - LIST_HEAD(tmp); - - size = min(page_num * mm.chunk_size, rem); - - err = i915_buddy_alloc_range(&mm, &tmp, offset, size); - if (err) { - if (err == -ENOMEM) { - pr_info("alloc_range hit -ENOMEM with size=%llx\n", - size); - } else { - pr_err("alloc_range with offset=%llx, size=%llx failed(%d)\n", - offset, size, err); - } - - break; - } - - block = list_first_entry_or_null(&tmp, - struct i915_buddy_block, - link); - if (!block) { - pr_err("alloc_range has no blocks\n"); - err = -EINVAL; - break; - } - - if (i915_buddy_block_offset(block) != offset) { - pr_err("alloc_range start offset mismatch, found=%llx, expected=%llx\n", - i915_buddy_block_offset(block), offset); - err = -EINVAL; - } - - if (!err) - err = igt_check_blocks(&mm, &tmp, size, true); - - list_splice_tail(&tmp, &blocks); - - if (err) - break; - - offset += size; - - rem -= size; - if (!rem) - break; - - cond_resched(); - } - - if (err == -ENOMEM) - err = 0; - - i915_buddy_free_list(&mm, &blocks); - - if (!err) { - err = igt_check_mm(&mm); - if (err) - pr_err("post-mm check failed\n"); - } - -err_fini: - i915_buddy_fini(&mm); - - return err; -} - -static int igt_buddy_alloc_limit(void *arg) -{ - struct i915_buddy_block *block; - struct i915_buddy_mm mm; - const u64 size = U64_MAX; - int err; - - err = i915_buddy_init(&mm, size, PAGE_SIZE); - if (err) - return err; - - if (mm.max_order != I915_BUDDY_MAX_ORDER) { - pr_err("mm.max_order(%d) != %d\n", - mm.max_order, I915_BUDDY_MAX_ORDER); - err = -EINVAL; - goto out_fini; - } - - block = i915_buddy_alloc(&mm, mm.max_order); - if (IS_ERR(block)) { - err = PTR_ERR(block); - goto out_fini; - } - - if (i915_buddy_block_order(block) != mm.max_order) { - pr_err("block order(%d) != %d\n", - i915_buddy_block_order(block), mm.max_order); - err = -EINVAL; - goto out_free; - } - - if (i915_buddy_block_size(&mm, block) != - BIT_ULL(mm.max_order) * PAGE_SIZE) { - pr_err("block size(%llu) != %llu\n", - i915_buddy_block_size(&mm, block), - BIT_ULL(mm.max_order) * PAGE_SIZE); - err = -EINVAL; - goto out_free; - } - -out_free: - i915_buddy_free(&mm, block); -out_fini: - i915_buddy_fini(&mm); - return err; -} - -int i915_buddy_mock_selftests(void) -{ - static const struct i915_subtest tests[] = { - SUBTEST(igt_buddy_alloc_pessimistic), - SUBTEST(igt_buddy_alloc_optimistic), - SUBTEST(igt_buddy_alloc_pathological), - SUBTEST(igt_buddy_alloc_smoke), - SUBTEST(igt_buddy_alloc_range), - SUBTEST(igt_buddy_alloc_limit), - }; - - return i915_subtests(tests, NULL); -} diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h index 793fb28a770d..0c22e0fc9059 100644 --- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h +++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h @@ -33,4 +33,3 @@ selftest(evict, i915_gem_evict_mock_selftests) selftest(gtt, i915_gem_gtt_mock_selftests) selftest(hugepages, i915_gem_huge_page_mock_selftests) selftest(memory_region, intel_memory_region_mock_selftests) -selftest(buddy, i915_buddy_mock_selftests) diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c index 0d5df0dc7212..a89e1f8b8c35 100644 --- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c +++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c @@ -6,6 +6,8 @@ #include <linux/prime_numbers.h> #include <linux/sort.h>
+#include <drm/drm_buddy.h> + #include "../i915_selftest.h"
#include "mock_drm.h" @@ -20,7 +22,6 @@ #include "gt/intel_engine_pm.h" #include "gt/intel_engine_user.h" #include "gt/intel_gt.h" -#include "i915_buddy.h" #include "gt/intel_migrate.h" #include "i915_memcpy.h" #include "i915_ttm_buddy_manager.h" @@ -369,7 +370,7 @@ static int igt_mock_splintered_region(void *arg) struct drm_i915_private *i915 = mem->i915; struct i915_ttm_buddy_resource *res; struct drm_i915_gem_object *obj; - struct i915_buddy_mm *mm; + struct drm_buddy_mm *mm; unsigned int expected_order; LIST_HEAD(objects); u64 size; @@ -454,8 +455,8 @@ static int igt_mock_max_segment(void *arg) struct drm_i915_private *i915 = mem->i915; struct i915_ttm_buddy_resource *res; struct drm_i915_gem_object *obj; - struct i915_buddy_block *block; - struct i915_buddy_mm *mm; + struct drm_buddy_block *block; + struct drm_buddy_mm *mm; struct list_head *blocks; struct scatterlist *sg; LIST_HEAD(objects); @@ -485,8 +486,8 @@ static int igt_mock_max_segment(void *arg) mm = res->mm; size = 0; list_for_each_entry(block, blocks, link) { - if (i915_buddy_block_size(mm, block) > size) - size = i915_buddy_block_size(mm, block); + if (drm_buddy_block_size(mm, block) > size) + size = drm_buddy_block_size(mm, block); } if (size < max_segment) { pr_err("%s: Failed to create a huge contiguous block [> %u], largest block %lld\n", diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h new file mode 100644 index 000000000000..09d73328c268 --- /dev/null +++ b/include/drm/drm_buddy.h @@ -0,0 +1,151 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2021 Intel Corporation + */ + +#ifndef __DRM_BUDDY_H__ +#define __DRM_BUDDY_H__ + +#include <linux/bitops.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/sched.h> + +#include <drm/drm_print.h> + +#define range_overflows(start, size, max) ({ \ + typeof(start) start__ = (start); \ + typeof(size) size__ = (size); \ + typeof(max) max__ = (max); \ + (void)(&start__ == &size__); \ + (void)(&start__ == &max__); \ + start__ >= max__ || size__ > max__ - start__; \ +}) + +struct drm_buddy_block { +#define DRM_BUDDY_HEADER_OFFSET GENMASK_ULL(63, 12) +#define DRM_BUDDY_HEADER_STATE GENMASK_ULL(11, 10) +#define DRM_BUDDY_ALLOCATED (1 << 10) +#define DRM_BUDDY_FREE (2 << 10) +#define DRM_BUDDY_SPLIT (3 << 10) +/* Free to be used, if needed in the future */ +#define DRM_BUDDY_HEADER_UNUSED GENMASK_ULL(9, 6) +#define DRM_BUDDY_HEADER_ORDER GENMASK_ULL(5, 0) + u64 header; + + struct drm_buddy_block *left; + struct drm_buddy_block *right; + struct drm_buddy_block *parent; + + void *private; /* owned by creator */ + + /* + * While the block is allocated by the user through drm_buddy_alloc*, + * the user has ownership of the link, for example to maintain within + * a list, if so desired. As soon as the block is freed with + * drm_buddy_free* ownership is given back to the mm. + */ + struct list_head link; + struct list_head tmp_link; +}; + +/* Order-zero must be at least PAGE_SIZE */ +#define DRM_BUDDY_MAX_ORDER (63 - PAGE_SHIFT) + +/* + * Binary Buddy System. + * + * Locking should be handled by the user, a simple mutex around + * drm_buddy_alloc* and drm_buddy_free* should suffice. + */ +struct drm_buddy_mm { + struct kmem_cache *slab_blocks; + /* Maintain a free list for each order. */ + struct list_head *free_list; + + /* + * Maintain explicit binary tree(s) to track the allocation of the + * address space. This gives us a simple way of finding a buddy block + * and performing the potentially recursive merge step when freeing a + * block. Nodes are either allocated or free, in which case they will + * also exist on the respective free list. + */ + struct drm_buddy_block **roots; + + /* + * Anything from here is public, and remains static for the lifetime of + * the mm. Everything above is considered do-not-touch. + */ + unsigned int n_roots; + unsigned int max_order; + + /* Must be at least PAGE_SIZE */ + u64 chunk_size; + u64 size; + u64 avail; +}; + +static inline u64 +drm_buddy_block_offset(struct drm_buddy_block *block) +{ + return block->header & DRM_BUDDY_HEADER_OFFSET; +} + +static inline unsigned int +drm_buddy_block_order(struct drm_buddy_block *block) +{ + return block->header & DRM_BUDDY_HEADER_ORDER; +} + +static inline unsigned int +drm_buddy_block_state(struct drm_buddy_block *block) +{ + return block->header & DRM_BUDDY_HEADER_STATE; +} + +static inline bool +drm_buddy_block_is_allocated(struct drm_buddy_block *block) +{ + return drm_buddy_block_state(block) == DRM_BUDDY_ALLOCATED; +} + +static inline bool +drm_buddy_block_is_free(struct drm_buddy_block *block) +{ + return drm_buddy_block_state(block) == DRM_BUDDY_FREE; +} + +static inline bool +drm_buddy_block_is_split(struct drm_buddy_block *block) +{ + return drm_buddy_block_state(block) == DRM_BUDDY_SPLIT; +} + +static inline u64 +drm_buddy_block_size(struct drm_buddy_mm *mm, + struct drm_buddy_block *block) +{ + return mm->chunk_size << drm_buddy_block_order(block); +} + +int drm_buddy_init(struct drm_buddy_mm *mm, u64 size, u64 chunk_size); + +void drm_buddy_fini(struct drm_buddy_mm *mm); + +struct drm_buddy_block * +drm_buddy_alloc(struct drm_buddy_mm *mm, unsigned int order); + +int drm_buddy_alloc_range(struct drm_buddy_mm *mm, + struct list_head *blocks, + u64 start, u64 size); + +void drm_buddy_free(struct drm_buddy_mm *mm, struct drm_buddy_block *block); + +void drm_buddy_free_list(struct drm_buddy_mm *mm, struct list_head *objects); + +void drm_buddy_print(struct drm_buddy_mm *mm, struct drm_printer *p); +void drm_buddy_block_print(struct drm_buddy_mm *mm, + struct drm_buddy_block *block, + struct drm_printer *p); + +#endif
base-commit: 6844a28885183a5a2af92a8d315a59f7a0e668b9
- Make drm_buddy_alloc a single function to handle range allocation and non-range allocation demands
- Implemented a new function alloc_range() which allocates the requested power-of-two block comply with range limitations
- Moved order computation and memory alignment logic from i915 driver to drm buddy
v2: merged below changes to keep the build unbroken - drm_buddy_alloc_range() becomes obsolete and may be removed - enable ttm range allocation (fpfn / lpfn) support in i915 driver - apply enhanced drm_buddy_alloc() function to i915 driver
v3(Matthew Auld): - Fix alignment issues and remove unnecessary list_empty check - add more validation checks for input arguments - make alloc_range() block allocations as bottom-up - optimize order computation logic - replace uint64_t with u64, which is preferred in the kernel
v4(Matthew Auld): - keep drm_buddy_alloc_range() function implementation for generic actual range allocations - keep alloc_range() implementation for end bias allocations
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com --- drivers/gpu/drm/drm_buddy.c | 316 +++++++++++++----- drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 67 ++-- drivers/gpu/drm/i915/i915_ttm_buddy_manager.h | 2 + include/drm/drm_buddy.h | 22 +- 4 files changed, 285 insertions(+), 122 deletions(-)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index 9340a4b61c5a..7f47632821f4 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -280,23 +280,97 @@ void drm_buddy_free_list(struct drm_buddy_mm *mm, struct list_head *objects) } EXPORT_SYMBOL(drm_buddy_free_list);
-/** - * drm_buddy_alloc - allocate power-of-two blocks - * - * @mm: DRM buddy manager to allocate from - * @order: size of the allocation - * - * The order value here translates to: - * - * 0 = 2^0 * mm->chunk_size - * 1 = 2^1 * mm->chunk_size - * 2 = 2^2 * mm->chunk_size - * - * Returns: - * allocated ptr to the &drm_buddy_block on success - */ -struct drm_buddy_block * -drm_buddy_alloc(struct drm_buddy_mm *mm, unsigned int order) +static inline bool overlaps(u64 s1, u64 e1, u64 s2, u64 e2) +{ + return s1 <= e2 && e1 >= s2; +} + +static inline bool contains(u64 s1, u64 e1, u64 s2, u64 e2) +{ + return s1 <= s2 && e1 >= e2; +} + +static struct drm_buddy_block * +alloc_range_bias(struct drm_buddy_mm *mm, + u64 start, u64 end, + unsigned int order) +{ + struct drm_buddy_block *block; + struct drm_buddy_block *buddy; + LIST_HEAD(dfs); + int err; + int i; + + end = end - 1; + + for (i = 0; i < mm->n_roots; ++i) + list_add_tail(&mm->roots[i]->tmp_link, &dfs); + + do { + u64 block_start; + u64 block_end; + + block = list_first_entry_or_null(&dfs, + struct drm_buddy_block, + tmp_link); + if (!block) + break; + + list_del(&block->tmp_link); + + if (drm_buddy_block_order(block) < order) + continue; + + block_start = drm_buddy_block_offset(block); + block_end = block_start + drm_buddy_block_size(mm, block) - 1; + + if (!overlaps(start, end, block_start, block_end)) + continue; + + if (drm_buddy_block_is_allocated(block)) + continue; + + if (contains(start, end, block_start, block_end) && + order == drm_buddy_block_order(block)) { + /* + * Find the free block within the range. + */ + if (drm_buddy_block_is_free(block)) + return block; + + continue; + } + + if (!drm_buddy_block_is_split(block)) { + err = split_block(mm, block); + if (unlikely(err)) + goto err_undo; + } + + list_add(&block->right->tmp_link, &dfs); + list_add(&block->left->tmp_link, &dfs); + } while (1); + + return ERR_PTR(-ENOSPC); + +err_undo: + /* + * We really don't want to leave around a bunch of split blocks, since + * bigger is better, so make sure we merge everything back before we + * free the allocated blocks. + */ + buddy = get_buddy(block); + if (buddy && + (drm_buddy_block_is_free(block) && + drm_buddy_block_is_free(buddy))) + __drm_buddy_free(mm, block); + return ERR_PTR(err); +} + +static struct drm_buddy_block * +alloc_from_freelist(struct drm_buddy_mm *mm, + unsigned int order, + unsigned long flags) { struct drm_buddy_block *block = NULL; unsigned int i; @@ -318,78 +392,28 @@ drm_buddy_alloc(struct drm_buddy_mm *mm, unsigned int order) while (i != order) { err = split_block(mm, block); if (unlikely(err)) - goto out_free; + goto err_undo;
- /* Go low */ - block = block->left; + block = block->right; i--; } - - mark_allocated(block); - mm->avail -= drm_buddy_block_size(mm, block); - kmemleak_update_trace(block); return block;
-out_free: +err_undo: if (i != order) __drm_buddy_free(mm, block); return ERR_PTR(err); } -EXPORT_SYMBOL(drm_buddy_alloc); - -static inline bool overlaps(u64 s1, u64 e1, u64 s2, u64 e2) -{ - return s1 <= e2 && e1 >= s2; -}
-static inline bool contains(u64 s1, u64 e1, u64 s2, u64 e2) -{ - return s1 <= s2 && e1 >= e2; -} - -/** - * drm_buddy_alloc_range - allocate range - * - * @mm: DRM buddy manager to allocate from - * @blocks: output list head to add allocated blocks - * @start: start of the allowed range for this block - * @size: size of the allocation - * - * Intended for pre-allocating portions of the address space, for example to - * reserve a block for the initial framebuffer or similar, hence the expectation - * here is that drm_buddy_alloc() is still the main vehicle for - * allocations, so if that's not the case then the drm_mm range allocator is - * probably a much better fit, and so you should probably go use that instead. - * - * Note that it's safe to chain together multiple alloc_ranges - * with the same blocks list - * - * Returns: - * 0 on success, error code on failure. - */ -int drm_buddy_alloc_range(struct drm_buddy_mm *mm, - struct list_head *blocks, - u64 start, u64 size) +static int __alloc_range(struct drm_buddy_mm *mm, + struct list_head *dfs, + u64 start, u64 size, + struct list_head *blocks) { struct drm_buddy_block *block; struct drm_buddy_block *buddy; - LIST_HEAD(allocated); - LIST_HEAD(dfs); u64 end; int err; - int i; - - if (size < mm->chunk_size) - return -EINVAL; - - if (!IS_ALIGNED(size | start, mm->chunk_size)) - return -EINVAL; - - if (range_overflows(start, size, mm->size)) - return -EINVAL; - - for (i = 0; i < mm->n_roots; ++i) - list_add_tail(&mm->roots[i]->tmp_link, &dfs);
end = start + size - 1;
@@ -397,7 +421,7 @@ int drm_buddy_alloc_range(struct drm_buddy_mm *mm, u64 block_start; u64 block_end;
- block = list_first_entry_or_null(&dfs, + block = list_first_entry_or_null(dfs, struct drm_buddy_block, tmp_link); if (!block) @@ -424,7 +448,7 @@ int drm_buddy_alloc_range(struct drm_buddy_mm *mm,
mark_allocated(block); mm->avail -= drm_buddy_block_size(mm, block); - list_add_tail(&block->link, &allocated); + list_add_tail(&block->link, blocks); continue; }
@@ -434,11 +458,10 @@ int drm_buddy_alloc_range(struct drm_buddy_mm *mm, goto err_undo; }
- list_add(&block->right->tmp_link, &dfs); - list_add(&block->left->tmp_link, &dfs); + list_add(&block->right->tmp_link, dfs); + list_add(&block->left->tmp_link, dfs); } while (1);
- list_splice_tail(&allocated, blocks); return 0;
err_undo: @@ -453,11 +476,144 @@ int drm_buddy_alloc_range(struct drm_buddy_mm *mm, drm_buddy_block_is_free(buddy))) __drm_buddy_free(mm, block);
+err_free: + drm_buddy_free_list(mm, blocks); + return err; +} + +/** + * __drm_buddy_alloc_range - actual range allocation + * + * @mm: DRM buddy manager to allocate from + * @start: start of the allowed range for this block + * @size: size of the allocation + * @blocks: output list head to add allocated blocks + * + * Intended for pre-allocating portions of the address space, for example to + * reserve a block for the initial framebuffer or similar + * + * Note that it's safe to chain together multiple alloc_ranges + * with the same blocks list + * + * Returns: + * 0 on success, error code on failure. + */ +static int __drm_buddy_alloc_range(struct drm_buddy_mm *mm, + u64 start, + u64 size, + struct list_head *blocks) +{ + LIST_HEAD(dfs); + int i; + + for (i = 0; i < mm->n_roots; ++i) + list_add_tail(&mm->roots[i]->tmp_link, &dfs); + + return __alloc_range(mm, &dfs, start, size, blocks); +} + +/** + * drm_buddy_alloc - allocate power-of-two blocks + * + * @mm: DRM buddy manager to allocate from + * @start: start of the allowed range for this block + * @end: end of the allowed range for this block + * @size: size of the allocation + * @min_page_size: alignment of the allocation + * @blocks: output list head to add allocated blocks + * @flags: DRM_BUDDY_*_ALLOCATION flags + * + * alloc_range_bias() called on range limitations, which traverses + * the tree and returns the desired block. + * + * alloc_from_freelist() called when *no* range restrictions + * are enforced, which picks the block from the freelist. + * + * blocks are allocated in order, the order value here translates to: + * + * 0 = 2^0 * mm->chunk_size + * 1 = 2^1 * mm->chunk_size + * 2 = 2^2 * mm->chunk_size + * + * Returns: + * 0 on success, error code on failure. + */ +int drm_buddy_alloc(struct drm_buddy_mm *mm, + u64 start, u64 end, u64 size, + u64 min_page_size, + struct list_head *blocks, + unsigned long flags) +{ + struct drm_buddy_block *block = NULL; + unsigned int min_order, order; + unsigned long pages; + LIST_HEAD(allocated); + int err; + + if (size < mm->chunk_size) + return -EINVAL; + + if (min_page_size < mm->chunk_size) + return -EINVAL; + + if (!is_power_of_2(min_page_size)) + return -EINVAL; + + if (!IS_ALIGNED(start | end | size, mm->chunk_size)) + return -EINVAL; + + if (check_range_overflow(start, end, size, mm->size)) + return -EINVAL; + + /* Actual range allocation */ + if (start + size == end) + return __drm_buddy_alloc_range(mm, start, size, blocks); + + pages = size >> ilog2(mm->chunk_size); + order = fls(pages) - 1; + min_order = ilog2(min_page_size) - ilog2(mm->chunk_size); + + do { + order = min(order, (unsigned int)fls(pages) - 1); + BUG_ON(order > mm->max_order); + BUG_ON(order < min_order); + + do { + if (flags & DRM_BUDDY_RANGE_ALLOCATION) + /* Allocate traversing within the range */ + block = alloc_range_bias(mm, start, end, order); + else + /* Allocate from freelist */ + block = alloc_from_freelist(mm, order, flags); + + if (!IS_ERR(block)) + break; + + if (order-- == min_order) { + err = -ENOSPC; + goto err_free; + } + } while (1); + + mark_allocated(block); + mm->avail -= drm_buddy_block_size(mm, block); + kmemleak_update_trace(block); + list_add_tail(&block->link, &allocated); + + pages -= BIT(order); + + if (!pages) + break; + } while (1); + + list_splice_tail(&allocated, blocks); + return 0; + err_free: drm_buddy_free_list(mm, &allocated); return err; } -EXPORT_SYMBOL(drm_buddy_alloc_range); +EXPORT_SYMBOL(drm_buddy_alloc);
/** * drm_buddy_block_print - print block information diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c index c4b70cb8c248..7621d42155e6 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c @@ -36,13 +36,14 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, struct i915_ttm_buddy_manager *bman = to_buddy_manager(man); struct i915_ttm_buddy_resource *bman_res; struct drm_buddy_mm *mm = &bman->mm; - unsigned long n_pages; - unsigned int min_order; + unsigned long n_pages, lpfn; u64 min_page_size; u64 size; int err;
- GEM_BUG_ON(place->fpfn || place->lpfn); + lpfn = place->lpfn; + if (!lpfn) + lpfn = man->size;
bman_res = kzalloc(sizeof(*bman_res), GFP_KERNEL); if (!bman_res) @@ -52,6 +53,9 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, INIT_LIST_HEAD(&bman_res->blocks); bman_res->mm = mm;
+ if (place->fpfn || lpfn != man->size) + bman_res->flags |= DRM_BUDDY_RANGE_ALLOCATION; + GEM_BUG_ON(!bman_res->base.num_pages); size = bman_res->base.num_pages << PAGE_SHIFT;
@@ -60,10 +64,16 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, min_page_size = bo->page_alignment << PAGE_SHIFT;
GEM_BUG_ON(min_page_size < mm->chunk_size); - min_order = ilog2(min_page_size) - ilog2(mm->chunk_size); + if (place->flags & TTM_PL_FLAG_CONTIGUOUS) { + unsigned long pages; + size = roundup_pow_of_two(size); - min_order = ilog2(size) - ilog2(mm->chunk_size); + min_page_size = size; + + pages = size >> ilog2(mm->chunk_size); + if (pages > lpfn) + lpfn = pages; }
if (size > mm->size) { @@ -73,34 +83,16 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
n_pages = size >> ilog2(mm->chunk_size);
- do { - struct drm_buddy_block *block; - unsigned int order; - - order = fls(n_pages) - 1; - GEM_BUG_ON(order > mm->max_order); - GEM_BUG_ON(order < min_order); - - do { - mutex_lock(&bman->lock); - block = drm_buddy_alloc(mm, order); - mutex_unlock(&bman->lock); - if (!IS_ERR(block)) - break; - - if (order-- == min_order) { - err = -ENOSPC; - goto err_free_blocks; - } - } while (1); - - n_pages -= BIT(order); - - list_add_tail(&block->link, &bman_res->blocks); - - if (!n_pages) - break; - } while (1); + mutex_lock(&bman->lock); + err = drm_buddy_alloc(mm, (u64)place->fpfn << PAGE_SHIFT, + (u64)place->lpfn << PAGE_SHIFT, + (u64)n_pages << PAGE_SHIFT, + min_page_size, + &bman_res->blocks, + bman_res->flags); + mutex_unlock(&bman->lock); + if (unlikely(err)) + goto err_free_blocks;
*res = &bman_res->base; return 0; @@ -266,10 +258,17 @@ int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man, { struct i915_ttm_buddy_manager *bman = to_buddy_manager(man); struct drm_buddy_mm *mm = &bman->mm; + unsigned long flags = 0; int ret;
+ flags |= DRM_BUDDY_RANGE_ALLOCATION; + mutex_lock(&bman->lock); - ret = drm_buddy_alloc_range(mm, &bman->reserved, start, size); + ret = drm_buddy_alloc(mm, start, + start + size, + size, mm->chunk_size, + &bman->reserved, + flags); mutex_unlock(&bman->lock);
return ret; diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h index fa644b512c2e..5ba490875f66 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h @@ -20,6 +20,7 @@ struct drm_buddy_mm; * * @base: struct ttm_resource base class we extend * @blocks: the list of struct i915_buddy_block for this resource/allocation + * @flags: DRM_BUDDY_*_ALLOCATION flags * @mm: the struct i915_buddy_mm for this resource * * Extends the struct ttm_resource to manage an address space allocation with @@ -28,6 +29,7 @@ struct drm_buddy_mm; struct i915_ttm_buddy_resource { struct ttm_resource base; struct list_head blocks; + unsigned long flags; struct drm_buddy_mm *mm; };
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index 09d73328c268..4368acaad222 100644 --- a/include/drm/drm_buddy.h +++ b/include/drm/drm_buddy.h @@ -13,15 +13,22 @@
#include <drm/drm_print.h>
-#define range_overflows(start, size, max) ({ \ +#define check_range_overflow(start, end, size, max) ({ \ typeof(start) start__ = (start); \ + typeof(end) end__ = (end);\ typeof(size) size__ = (size); \ typeof(max) max__ = (max); \ (void)(&start__ == &size__); \ (void)(&start__ == &max__); \ - start__ >= max__ || size__ > max__ - start__; \ + (void)(&start__ == &end__); \ + (void)(&end__ == &size__); \ + (void)(&end__ == &max__); \ + start__ >= max__ || end__ > max__ || \ + size__ > end__ - start__; \ })
+#define DRM_BUDDY_RANGE_ALLOCATION (1 << 0) + struct drm_buddy_block { #define DRM_BUDDY_HEADER_OFFSET GENMASK_ULL(63, 12) #define DRM_BUDDY_HEADER_STATE GENMASK_ULL(11, 10) @@ -132,12 +139,11 @@ int drm_buddy_init(struct drm_buddy_mm *mm, u64 size, u64 chunk_size);
void drm_buddy_fini(struct drm_buddy_mm *mm);
-struct drm_buddy_block * -drm_buddy_alloc(struct drm_buddy_mm *mm, unsigned int order); - -int drm_buddy_alloc_range(struct drm_buddy_mm *mm, - struct list_head *blocks, - u64 start, u64 size); +int drm_buddy_alloc(struct drm_buddy_mm *mm, + u64 start, u64 end, u64 size, + u64 min_page_size, + struct list_head *blocks, + unsigned long flags);
void drm_buddy_free(struct drm_buddy_mm *mm, struct drm_buddy_block *block);
On 26/12/2021 22:24, Arunpravin wrote:
Make drm_buddy_alloc a single function to handle range allocation and non-range allocation demands
Implemented a new function alloc_range() which allocates the requested power-of-two block comply with range limitations
Moved order computation and memory alignment logic from i915 driver to drm buddy
v2: merged below changes to keep the build unbroken - drm_buddy_alloc_range() becomes obsolete and may be removed - enable ttm range allocation (fpfn / lpfn) support in i915 driver - apply enhanced drm_buddy_alloc() function to i915 driver
v3(Matthew Auld):
- Fix alignment issues and remove unnecessary list_empty check
- add more validation checks for input arguments
- make alloc_range() block allocations as bottom-up
- optimize order computation logic
- replace uint64_t with u64, which is preferred in the kernel
v4(Matthew Auld):
- keep drm_buddy_alloc_range() function implementation for generic actual range allocations
- keep alloc_range() implementation for end bias allocations
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com
<snip>
@@ -73,34 +83,16 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
n_pages = size >> ilog2(mm->chunk_size);
- do {
struct drm_buddy_block *block;unsigned int order;order = fls(n_pages) - 1;GEM_BUG_ON(order > mm->max_order);GEM_BUG_ON(order < min_order);do {mutex_lock(&bman->lock);block = drm_buddy_alloc(mm, order);mutex_unlock(&bman->lock);if (!IS_ERR(block))break;if (order-- == min_order) {err = -ENOSPC;goto err_free_blocks;}} while (1);n_pages -= BIT(order);list_add_tail(&block->link, &bman_res->blocks);if (!n_pages)break;- } while (1);
- mutex_lock(&bman->lock);
- err = drm_buddy_alloc(mm, (u64)place->fpfn << PAGE_SHIFT,
(u64)place->lpfn << PAGE_SHIFT,
place->lpfn will currently always be zero for i915, AFAIK. I assume here we want s/place->lpfn/lpfn/?
Also something in this series is preventing i915 from loading on discrete devices, according to CI. Hopefully that is just the lpfn issue...which might explain seeing -EINVAL here[1] when allocating some vram for the firmware.
[1] https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_21904/bat-dg1-6/boot0.txt
(u64)n_pages << PAGE_SHIFT,min_page_size,&bman_res->blocks,bman_res->flags);mutex_unlock(&bman->lock);
if (unlikely(err))
goto err_free_blocks;*res = &bman_res->base; return 0;
@@ -266,10 +258,17 @@ int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man, { struct i915_ttm_buddy_manager *bman = to_buddy_manager(man); struct drm_buddy_mm *mm = &bman->mm;
unsigned long flags = 0; int ret;
flags |= DRM_BUDDY_RANGE_ALLOCATION;
mutex_lock(&bman->lock);
- ret = drm_buddy_alloc_range(mm, &bman->reserved, start, size);
ret = drm_buddy_alloc(mm, start,
start + size,size, mm->chunk_size,&bman->reserved,flags);mutex_unlock(&bman->lock);
return ret;
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h index fa644b512c2e..5ba490875f66 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h @@ -20,6 +20,7 @@ struct drm_buddy_mm;
- @base: struct ttm_resource base class we extend
- @blocks: the list of struct i915_buddy_block for this resource/allocation
- @flags: DRM_BUDDY_*_ALLOCATION flags
- @mm: the struct i915_buddy_mm for this resource
- Extends the struct ttm_resource to manage an address space allocation with
@@ -28,6 +29,7 @@ struct drm_buddy_mm; struct i915_ttm_buddy_resource { struct ttm_resource base; struct list_head blocks;
- unsigned long flags; struct drm_buddy_mm *mm; };
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index 09d73328c268..4368acaad222 100644 --- a/include/drm/drm_buddy.h +++ b/include/drm/drm_buddy.h @@ -13,15 +13,22 @@
#include <drm/drm_print.h>
-#define range_overflows(start, size, max) ({ \ +#define check_range_overflow(start, end, size, max) ({ \ typeof(start) start__ = (start); \
- typeof(end) end__ = (end);\ typeof(size) size__ = (size); \ typeof(max) max__ = (max); \ (void)(&start__ == &size__); \ (void)(&start__ == &max__); \
- start__ >= max__ || size__ > max__ - start__; \
- (void)(&start__ == &end__); \
- (void)(&end__ == &size__); \
- (void)(&end__ == &max__); \
- start__ >= max__ || end__ > max__ || \
- size__ > end__ - start__; \ })
+#define DRM_BUDDY_RANGE_ALLOCATION (1 << 0)
- struct drm_buddy_block { #define DRM_BUDDY_HEADER_OFFSET GENMASK_ULL(63, 12) #define DRM_BUDDY_HEADER_STATE GENMASK_ULL(11, 10)
@@ -132,12 +139,11 @@ int drm_buddy_init(struct drm_buddy_mm *mm, u64 size, u64 chunk_size);
void drm_buddy_fini(struct drm_buddy_mm *mm);
-struct drm_buddy_block * -drm_buddy_alloc(struct drm_buddy_mm *mm, unsigned int order);
-int drm_buddy_alloc_range(struct drm_buddy_mm *mm,
struct list_head *blocks,u64 start, u64 size);+int drm_buddy_alloc(struct drm_buddy_mm *mm,
u64 start, u64 end, u64 size,u64 min_page_size,struct list_head *blocks,unsigned long flags);void drm_buddy_free(struct drm_buddy_mm *mm, struct drm_buddy_block *block);
Implemented a function which walk through the order list, compares the offset and returns the maximum offset block, this method is unpredictable in obtaining the high range address blocks which depends on allocation and deallocation. for instance, if driver requests address at a low specific range, allocator traverses from the root block and splits the larger blocks until it reaches the specific block and in the process of splitting, lower orders in the freelist are occupied with low range address blocks and for the subsequent TOPDOWN memory request we may return the low range blocks.To overcome this issue, we may go with the below approach.
The other approach, sorting each order list entries in ascending order and compares the last entry of each order list in the freelist and return the max block. This creates sorting overhead on every drm_buddy_free() request and split up of larger blocks for a single page request.
v2: - Fix alignment issues(Matthew Auld) - Remove unnecessary list_empty check(Matthew Auld) - merged the below patch to see the feature in action - add top-down alloc support to i915 driver
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com --- drivers/gpu/drm/drm_buddy.c | 36 ++++++++++++++++--- drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 3 ++ include/drm/drm_buddy.h | 1 + 3 files changed, 35 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index 7f47632821f4..eddc1eeda02e 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -367,6 +367,26 @@ alloc_range_bias(struct drm_buddy_mm *mm, return ERR_PTR(err); }
+static struct drm_buddy_block * +get_maxblock(struct list_head *head) +{ + struct drm_buddy_block *max_block = NULL, *node; + + max_block = list_first_entry_or_null(head, + struct drm_buddy_block, + link); + if (!max_block) + return NULL; + + list_for_each_entry(node, head, link) { + if (drm_buddy_block_offset(node) > + drm_buddy_block_offset(max_block)) + max_block = node; + } + + return max_block; +} + static struct drm_buddy_block * alloc_from_freelist(struct drm_buddy_mm *mm, unsigned int order, @@ -377,11 +397,17 @@ alloc_from_freelist(struct drm_buddy_mm *mm, int err;
for (i = order; i <= mm->max_order; ++i) { - block = list_first_entry_or_null(&mm->free_list[i], - struct drm_buddy_block, - link); - if (block) - break; + if (flags & DRM_BUDDY_TOPDOWN_ALLOCATION) { + block = get_maxblock(&mm->free_list[i]); + if (block) + break; + } else { + block = list_first_entry_or_null(&mm->free_list[i], + struct drm_buddy_block, + link); + if (block) + break; + } }
if (!block) diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c index 7621d42155e6..7c58efb60dba 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c @@ -53,6 +53,9 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, INIT_LIST_HEAD(&bman_res->blocks); bman_res->mm = mm;
+ if (place->flags & TTM_PL_FLAG_TOPDOWN) + bman_res->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION; + if (place->fpfn || lpfn != man->size) bman_res->flags |= DRM_BUDDY_RANGE_ALLOCATION;
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index 4368acaad222..f573b02304f4 100644 --- a/include/drm/drm_buddy.h +++ b/include/drm/drm_buddy.h @@ -28,6 +28,7 @@ })
#define DRM_BUDDY_RANGE_ALLOCATION (1 << 0) +#define DRM_BUDDY_TOPDOWN_ALLOCATION (1 << 1)
struct drm_buddy_block { #define DRM_BUDDY_HEADER_OFFSET GENMASK_ULL(63, 12)
On contiguous allocation, we round up the size to the *next* power of 2, implement a function to free the unused pages after the newly allocate block.
v2(Matthew Auld): - replace function name 'drm_buddy_free_unused_pages' with drm_buddy_block_trim - replace input argument name 'actual_size' with 'new_size' - add more validation checks for input arguments - add overlaps check to avoid needless searching and splitting - merged the below patch to see the feature in action - add free unused pages support to i915 driver - lock drm_buddy_block_trim() function as it calls mark_free/mark_split are all globally visible
v3(Matthew Auld): - remove trim method error handling as we address the failure case at drm_buddy_block_trim() function
v4: - in case of trim, at __alloc_range() split_block failure path marks the block as free and removes it from the original list, potentially also freeing it, to overcome this problem, we turn the drm_buddy_block_trim() input node into a temporary node to prevent recursively freeing itself, but still retain the un-splitting/freeing of the other nodes(Matthew Auld)
- modify the drm_buddy_block_trim() function return type
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com --- drivers/gpu/drm/drm_buddy.c | 61 +++++++++++++++++++ drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 8 +++ include/drm/drm_buddy.h | 4 ++ 3 files changed, 73 insertions(+)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index eddc1eeda02e..855afcaf7edd 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -538,6 +538,67 @@ static int __drm_buddy_alloc_range(struct drm_buddy_mm *mm, return __alloc_range(mm, &dfs, start, size, blocks); }
+/** + * drm_buddy_block_trim - free unused pages + * + * @mm: DRM buddy manager + * @new_size: original size requested + * @blocks: output list head to add allocated blocks + * + * For contiguous allocation, we round up the size to the nearest + * power of two value, drivers consume *actual* size, so remaining + * portions are unused and it can be freed. + */ +void drm_buddy_block_trim(struct drm_buddy_mm *mm, + u64 new_size, + struct list_head *blocks) +{ + struct drm_buddy_block *parent; + struct drm_buddy_block *block; + LIST_HEAD(dfs); + u64 new_start; + int err; + + if (!list_is_singular(blocks)) + return; + + block = list_first_entry(blocks, + struct drm_buddy_block, + link); + + if (!drm_buddy_block_is_allocated(block)) + return; + + if (new_size > drm_buddy_block_size(mm, block)) + return; + + if (!new_size && !IS_ALIGNED(new_size, mm->chunk_size)) + return; + + if (new_size == drm_buddy_block_size(mm, block)) + return; + + list_del(&block->link); + mark_free(mm, block); + mm->avail += drm_buddy_block_size(mm, block); + + /* Prevent recursively freeing this node */ + parent = block->parent; + block->parent = NULL; + + new_start = drm_buddy_block_offset(block); + list_add(&block->tmp_link, &dfs); + err = __alloc_range(mm, &dfs, new_start, new_size, blocks); + if (err) { + mark_allocated(block); + mm->avail -= drm_buddy_block_size(mm, block); + list_add(&block->link, blocks); + } + + block->parent = parent; +} +EXPORT_SYMBOL(drm_buddy_block_trim); + /** * drm_buddy_alloc - allocate power-of-two blocks * diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c index 7c58efb60dba..05f924f32e96 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c @@ -97,6 +97,14 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, if (unlikely(err)) goto err_free_blocks;
+ if (place->flags & TTM_PL_FLAG_CONTIGUOUS) { + mutex_lock(&bman->lock); + drm_buddy_block_trim(mm, + (u64)n_pages << PAGE_SHIFT, + &bman_res->blocks); + mutex_unlock(&bman->lock); + } + *res = &bman_res->base; return 0;
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index f573b02304f4..703866a87939 100644 --- a/include/drm/drm_buddy.h +++ b/include/drm/drm_buddy.h @@ -146,6 +146,10 @@ int drm_buddy_alloc(struct drm_buddy_mm *mm, struct list_head *blocks, unsigned long flags);
+void drm_buddy_block_trim(struct drm_buddy_mm *mm, + u64 new_size, + struct list_head *blocks); + void drm_buddy_free(struct drm_buddy_mm *mm, struct drm_buddy_block *block);
void drm_buddy_free_list(struct drm_buddy_mm *mm, struct list_head *objects);
On 26/12/2021 22:24, Arunpravin wrote:
On contiguous allocation, we round up the size to the *next* power of 2, implement a function to free the unused pages after the newly allocate block.
v2(Matthew Auld):
- replace function name 'drm_buddy_free_unused_pages' with drm_buddy_block_trim
- replace input argument name 'actual_size' with 'new_size'
- add more validation checks for input arguments
- add overlaps check to avoid needless searching and splitting
- merged the below patch to see the feature in action
- add free unused pages support to i915 driver
- lock drm_buddy_block_trim() function as it calls mark_free/mark_split are all globally visible
v3(Matthew Auld):
- remove trim method error handling as we address the failure case at drm_buddy_block_trim() function
v4:
in case of trim, at __alloc_range() split_block failure path marks the block as free and removes it from the original list, potentially also freeing it, to overcome this problem, we turn the drm_buddy_block_trim() input node into a temporary node to prevent recursively freeing itself, but still retain the un-splitting/freeing of the other nodes(Matthew Auld)
modify the drm_buddy_block_trim() function return type
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com
drivers/gpu/drm/drm_buddy.c | 61 +++++++++++++++++++ drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 8 +++ include/drm/drm_buddy.h | 4 ++ 3 files changed, 73 insertions(+)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index eddc1eeda02e..855afcaf7edd 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -538,6 +538,67 @@ static int __drm_buddy_alloc_range(struct drm_buddy_mm *mm, return __alloc_range(mm, &dfs, start, size, blocks); }
+/**
- drm_buddy_block_trim - free unused pages
- @mm: DRM buddy manager
- @new_size: original size requested
- @blocks: output list head to add allocated blocks
- For contiguous allocation, we round up the size to the nearest
- power of two value, drivers consume *actual* size, so remaining
- portions are unused and it can be freed.
- */
+void drm_buddy_block_trim(struct drm_buddy_mm *mm,
u64 new_size,struct list_head *blocks)
It might be better to just return the error, and let the user decide if they want to ignore it? Also we might want some kind of unit test for this, so having an actual return value might be useful there.
+{
- struct drm_buddy_block *parent;
- struct drm_buddy_block *block;
- LIST_HEAD(dfs);
- u64 new_start;
- int err;
- if (!list_is_singular(blocks))
return;- block = list_first_entry(blocks,
struct drm_buddy_block,link);- if (!drm_buddy_block_is_allocated(block))
return;- if (new_size > drm_buddy_block_size(mm, block))
return;- if (!new_size && !IS_ALIGNED(new_size, mm->chunk_size))
return;- if (new_size == drm_buddy_block_size(mm, block))
return;- list_del(&block->link);
- mark_free(mm, block);
- mm->avail += drm_buddy_block_size(mm, block);
- /* Prevent recursively freeing this node */
- parent = block->parent;
- block->parent = NULL;
- new_start = drm_buddy_block_offset(block);
- list_add(&block->tmp_link, &dfs);
- err = __alloc_range(mm, &dfs, new_start, new_size, blocks);
- if (err) {
mark_allocated(block);mm->avail -= drm_buddy_block_size(mm, block);list_add(&block->link, blocks);- }
- block->parent = parent;
+} +EXPORT_SYMBOL(drm_buddy_block_trim);
- /**
- drm_buddy_alloc - allocate power-of-two blocks
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c index 7c58efb60dba..05f924f32e96 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c @@ -97,6 +97,14 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, if (unlikely(err)) goto err_free_blocks;
- if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
mutex_lock(&bman->lock);drm_buddy_block_trim(mm,(u64)n_pages << PAGE_SHIFT,
AFAIK, n_pages has already been rounded up to the next power-of-two here, so this becomes a noop. I assume we need to use the "original" size here?
&bman_res->blocks);mutex_unlock(&bman->lock);- }
- *res = &bman_res->base; return 0;
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index f573b02304f4..703866a87939 100644 --- a/include/drm/drm_buddy.h +++ b/include/drm/drm_buddy.h @@ -146,6 +146,10 @@ int drm_buddy_alloc(struct drm_buddy_mm *mm, struct list_head *blocks, unsigned long flags);
+void drm_buddy_block_trim(struct drm_buddy_mm *mm,
u64 new_size,struct list_head *blocks);void drm_buddy_free(struct drm_buddy_mm *mm, struct drm_buddy_block *block);
void drm_buddy_free_list(struct drm_buddy_mm *mm, struct list_head *objects);
On 04/01/22 7:41 pm, Matthew Auld wrote:
On 26/12/2021 22:24, Arunpravin wrote:
On contiguous allocation, we round up the size to the *next* power of 2, implement a function to free the unused pages after the newly allocate block.
v2(Matthew Auld):
- replace function name 'drm_buddy_free_unused_pages' with drm_buddy_block_trim
- replace input argument name 'actual_size' with 'new_size'
- add more validation checks for input arguments
- add overlaps check to avoid needless searching and splitting
- merged the below patch to see the feature in action
- add free unused pages support to i915 driver
- lock drm_buddy_block_trim() function as it calls mark_free/mark_split are all globally visible
v3(Matthew Auld):
- remove trim method error handling as we address the failure case at drm_buddy_block_trim() function
v4:
in case of trim, at __alloc_range() split_block failure path marks the block as free and removes it from the original list, potentially also freeing it, to overcome this problem, we turn the drm_buddy_block_trim() input node into a temporary node to prevent recursively freeing itself, but still retain the un-splitting/freeing of the other nodes(Matthew Auld)
modify the drm_buddy_block_trim() function return type
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com
drivers/gpu/drm/drm_buddy.c | 61 +++++++++++++++++++ drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 8 +++ include/drm/drm_buddy.h | 4 ++ 3 files changed, 73 insertions(+)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index eddc1eeda02e..855afcaf7edd 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -538,6 +538,67 @@ static int __drm_buddy_alloc_range(struct drm_buddy_mm *mm, return __alloc_range(mm, &dfs, start, size, blocks); }
+/**
- drm_buddy_block_trim - free unused pages
- @mm: DRM buddy manager
- @new_size: original size requested
- @blocks: output list head to add allocated blocks
- For contiguous allocation, we round up the size to the nearest
- power of two value, drivers consume *actual* size, so remaining
- portions are unused and it can be freed.
- */
+void drm_buddy_block_trim(struct drm_buddy_mm *mm,
u64 new_size,struct list_head *blocks)It might be better to just return the error, and let the user decide if they want to ignore it? Also we might want some kind of unit test for this, so having an actual return value might be useful there.
sure will revert it
+{
- struct drm_buddy_block *parent;
- struct drm_buddy_block *block;
- LIST_HEAD(dfs);
- u64 new_start;
- int err;
- if (!list_is_singular(blocks))
return;- block = list_first_entry(blocks,
struct drm_buddy_block,link);- if (!drm_buddy_block_is_allocated(block))
return;- if (new_size > drm_buddy_block_size(mm, block))
return;- if (!new_size && !IS_ALIGNED(new_size, mm->chunk_size))
return;- if (new_size == drm_buddy_block_size(mm, block))
return;- list_del(&block->link);
- mark_free(mm, block);
- mm->avail += drm_buddy_block_size(mm, block);
- /* Prevent recursively freeing this node */
- parent = block->parent;
- block->parent = NULL;
- new_start = drm_buddy_block_offset(block);
- list_add(&block->tmp_link, &dfs);
- err = __alloc_range(mm, &dfs, new_start, new_size, blocks);
- if (err) {
mark_allocated(block);mm->avail -= drm_buddy_block_size(mm, block);list_add(&block->link, blocks);- }
- block->parent = parent;
+} +EXPORT_SYMBOL(drm_buddy_block_trim);
- /**
- drm_buddy_alloc - allocate power-of-two blocks
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c index 7c58efb60dba..05f924f32e96 100644 --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c @@ -97,6 +97,14 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man, if (unlikely(err)) goto err_free_blocks;
- if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
mutex_lock(&bman->lock);drm_buddy_block_trim(mm,(u64)n_pages << PAGE_SHIFT,AFAIK, n_pages has already been rounded up to the next power-of-two here, so this becomes a noop. I assume we need to use the "original" size here?
ah yes..missed it, will change as below u64 original_size = (u64)bman_res->base.num_pages << PAGE_SHIFT;
mutex_lock(&bman->lock); drm_buddy_block_trim(mm, original_size, &bman_res->blocks);
&bman_res->blocks);mutex_unlock(&bman->lock);- }
- *res = &bman_res->base; return 0;
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index f573b02304f4..703866a87939 100644 --- a/include/drm/drm_buddy.h +++ b/include/drm/drm_buddy.h @@ -146,6 +146,10 @@ int drm_buddy_alloc(struct drm_buddy_mm *mm, struct list_head *blocks, unsigned long flags);
+void drm_buddy_block_trim(struct drm_buddy_mm *mm,
u64 new_size,struct list_head *blocks);void drm_buddy_free(struct drm_buddy_mm *mm, struct drm_buddy_block *block);
void drm_buddy_free_list(struct drm_buddy_mm *mm, struct list_head *objects);
Move shared vram inline functions and structs into a header file
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com --- drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h | 51 ++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h new file mode 100644 index 000000000000..59983464cce5 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: MIT + * Copyright 2021 Advanced Micro Devices, Inc. + * + * 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, sublicense, + * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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. + * + */ + +#ifndef __AMDGPU_VRAM_MGR_H__ +#define __AMDGPU_VRAM_MGR_H__ + +#include <drm/drm_buddy.h> + +struct amdgpu_vram_mgr_node { + struct ttm_resource base; + struct list_head blocks; + unsigned long flags; +}; + +static inline u64 amdgpu_node_start(struct drm_buddy_block *block) +{ + return drm_buddy_block_offset(block); +} + +static inline u64 amdgpu_node_size(struct drm_buddy_block *block) +{ + return PAGE_SIZE << drm_buddy_block_order(block); +} + +static inline struct amdgpu_vram_mgr_node * +to_amdgpu_vram_mgr_node(struct ttm_resource *res) +{ + return container_of(res, struct amdgpu_vram_mgr_node, base); +} + +#endif
- Remove drm_mm references and replace with drm buddy functionalities - Add res cursor support for drm buddy
v2(Matthew Auld): - replace spinlock with mutex as we call kmem_cache_zalloc (..., GFP_KERNEL) in drm_buddy_alloc() function
- lock drm_buddy_block_trim() function as it calls mark_free/mark_split are all globally visible
v3(Matthew Auld): - remove trim method error handling as we address the failure case at drm_buddy_block_trim() function
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com --- drivers/gpu/drm/Kconfig | 1 + .../gpu/drm/amd/amdgpu/amdgpu_res_cursor.h | 97 +++++-- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 6 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 259 ++++++++++-------- 4 files changed, 230 insertions(+), 133 deletions(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index b85f7ffae621..572fcc4adedd 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -270,6 +270,7 @@ config DRM_AMDGPU select HWMON select BACKLIGHT_CLASS_DEVICE select INTERVAL_TREE + select DRM_BUDDY help Choose this option if you have a recent AMD Radeon graphics card.
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h index acfa207cf970..da12b4ff2e45 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h @@ -30,12 +30,15 @@ #include <drm/ttm/ttm_resource.h> #include <drm/ttm/ttm_range_manager.h>
+#include "amdgpu_vram_mgr.h" + /* state back for walking over vram_mgr and gtt_mgr allocations */ struct amdgpu_res_cursor { uint64_t start; uint64_t size; uint64_t remaining; - struct drm_mm_node *node; + void *node; + uint32_t mem_type; };
/** @@ -52,27 +55,63 @@ static inline void amdgpu_res_first(struct ttm_resource *res, uint64_t start, uint64_t size, struct amdgpu_res_cursor *cur) { + struct drm_buddy_block *block; + struct list_head *head, *next; struct drm_mm_node *node;
- if (!res || res->mem_type == TTM_PL_SYSTEM) { - cur->start = start; - cur->size = size; - cur->remaining = size; - cur->node = NULL; - WARN_ON(res && start + size > res->num_pages << PAGE_SHIFT); - return; - } + if (!res) + goto err_out;
BUG_ON(start + size > res->num_pages << PAGE_SHIFT);
- node = to_ttm_range_mgr_node(res)->mm_nodes; - while (start >= node->size << PAGE_SHIFT) - start -= node++->size << PAGE_SHIFT; + cur->mem_type = res->mem_type; + + switch (cur->mem_type) { + case TTM_PL_VRAM: + head = &to_amdgpu_vram_mgr_node(res)->blocks; + + block = list_first_entry_or_null(head, + struct drm_buddy_block, + link); + if (!block) + goto err_out; + + while (start >= amdgpu_node_size(block)) { + start -= amdgpu_node_size(block); + + next = block->link.next; + if (next != head) + block = list_entry(next, struct drm_buddy_block, link); + } + + cur->start = amdgpu_node_start(block) + start; + cur->size = min(amdgpu_node_size(block) - start, size); + cur->remaining = size; + cur->node = block; + break; + case TTM_PL_TT: + node = to_ttm_range_mgr_node(res)->mm_nodes; + while (start >= node->size << PAGE_SHIFT) + start -= node++->size << PAGE_SHIFT; + + cur->start = (node->start << PAGE_SHIFT) + start; + cur->size = min((node->size << PAGE_SHIFT) - start, size); + cur->remaining = size; + cur->node = node; + break; + default: + goto err_out; + }
- cur->start = (node->start << PAGE_SHIFT) + start; - cur->size = min((node->size << PAGE_SHIFT) - start, size); + return; + +err_out: + cur->start = start; + cur->size = size; cur->remaining = size; - cur->node = node; + cur->node = NULL; + WARN_ON(res && start + size > res->num_pages << PAGE_SHIFT); + return; }
/** @@ -85,7 +124,9 @@ static inline void amdgpu_res_first(struct ttm_resource *res, */ static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size) { - struct drm_mm_node *node = cur->node; + struct drm_buddy_block *block; + struct drm_mm_node *node; + struct list_head *next;
BUG_ON(size > cur->remaining);
@@ -99,9 +140,27 @@ static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size) return; }
- cur->node = ++node; - cur->start = node->start << PAGE_SHIFT; - cur->size = min(node->size << PAGE_SHIFT, cur->remaining); + switch (cur->mem_type) { + case TTM_PL_VRAM: + block = cur->node; + + next = block->link.next; + block = list_entry(next, struct drm_buddy_block, link); + + cur->node = block; + cur->start = amdgpu_node_start(block); + cur->size = min(amdgpu_node_size(block), cur->remaining); + break; + case TTM_PL_TT: + node = cur->node; + + cur->node = ++node; + cur->start = node->start << PAGE_SHIFT; + cur->size = min(node->size << PAGE_SHIFT, cur->remaining); + break; + default: + return; + } }
#endif diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h index 7346ecff4438..946dfac486a7 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h @@ -26,6 +26,7 @@
#include <linux/dma-direction.h> #include <drm/gpu_scheduler.h> +#include <drm/drm_buddy.h> #include "amdgpu.h"
#define AMDGPU_PL_GDS (TTM_PL_PRIV + 0) @@ -40,12 +41,13 @@
struct amdgpu_vram_mgr { struct ttm_resource_manager manager; - struct drm_mm mm; - spinlock_t lock; + struct drm_buddy_mm mm; + struct mutex lock; struct list_head reservations_pending; struct list_head reserved_pages; atomic64_t usage; atomic64_t vis_usage; + u64 default_page_size; };
struct amdgpu_gtt_mgr { diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c index 7b2b0980ec41..8355f8c656df 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c @@ -32,8 +32,11 @@ #include "atom.h"
struct amdgpu_vram_reservation { + u64 start; + u64 size; + unsigned long flags; + struct list_head block; struct list_head node; - struct drm_mm_node mm_node; };
static inline struct amdgpu_vram_mgr * @@ -196,10 +199,10 @@ const struct attribute_group amdgpu_vram_mgr_attr_group = { * Calculate how many bytes of the MM node are inside visible VRAM */ static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev, - struct drm_mm_node *node) + struct drm_buddy_block *block) { - uint64_t start = node->start << PAGE_SHIFT; - uint64_t end = (node->size + node->start) << PAGE_SHIFT; + u64 start = amdgpu_node_start(block); + u64 end = start + amdgpu_node_size(block);
if (start >= adev->gmc.visible_vram_size) return 0; @@ -220,9 +223,9 @@ u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo) { struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); struct ttm_resource *res = bo->tbo.resource; - unsigned pages = res->num_pages; - struct drm_mm_node *mm; - u64 usage; + struct amdgpu_vram_mgr_node *node = to_amdgpu_vram_mgr_node(res); + struct drm_buddy_block *block; + u64 usage = 0;
if (amdgpu_gmc_vram_full_visible(&adev->gmc)) return amdgpu_bo_size(bo); @@ -230,9 +233,8 @@ u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo) if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT) return 0;
- mm = &container_of(res, struct ttm_range_mgr_node, base)->mm_nodes[0]; - for (usage = 0; pages; pages -= mm->size, mm++) - usage += amdgpu_vram_mgr_vis_size(adev, mm); + list_for_each_entry(block, &node->blocks, link) + usage += amdgpu_vram_mgr_vis_size(adev, block);
return usage; } @@ -242,21 +244,29 @@ static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man) { struct amdgpu_vram_mgr *mgr = to_vram_mgr(man); struct amdgpu_device *adev = to_amdgpu_device(mgr); - struct drm_mm *mm = &mgr->mm; + struct drm_buddy_mm *mm = &mgr->mm; struct amdgpu_vram_reservation *rsv, *temp; + struct drm_buddy_block *block; uint64_t vis_usage;
list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, node) { - if (drm_mm_reserve_node(mm, &rsv->mm_node)) + if (drm_buddy_alloc(mm, rsv->start, rsv->start + rsv->size, + rsv->size, mm->chunk_size, &rsv->block, + rsv->flags)) continue;
- dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n", - rsv->mm_node.start, rsv->mm_node.size); - - vis_usage = amdgpu_vram_mgr_vis_size(adev, &rsv->mm_node); - atomic64_add(vis_usage, &mgr->vis_usage); - atomic64_add(rsv->mm_node.size << PAGE_SHIFT, &mgr->usage); - list_move(&rsv->node, &mgr->reserved_pages); + block = list_first_entry_or_null(&rsv->block, + struct drm_buddy_block, + link); + if (block) { + dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n", + rsv->start, rsv->size); + + vis_usage = amdgpu_vram_mgr_vis_size(adev, block); + atomic64_add(vis_usage, &mgr->vis_usage); + atomic64_add(rsv->size, &mgr->usage); + list_move(&rsv->node, &mgr->reserved_pages); + } } }
@@ -280,13 +290,16 @@ int amdgpu_vram_mgr_reserve_range(struct ttm_resource_manager *man, return -ENOMEM;
INIT_LIST_HEAD(&rsv->node); - rsv->mm_node.start = start >> PAGE_SHIFT; - rsv->mm_node.size = size >> PAGE_SHIFT; + INIT_LIST_HEAD(&rsv->block); + + rsv->start = start; + rsv->size = size; + rsv->flags |= DRM_BUDDY_RANGE_ALLOCATION;
- spin_lock(&mgr->lock); - list_add_tail(&mgr->reservations_pending, &rsv->node); + mutex_lock(&mgr->lock); + list_add_tail(&rsv->node, &mgr->reservations_pending); amdgpu_vram_mgr_do_reserve(man); - spin_unlock(&mgr->lock); + mutex_unlock(&mgr->lock);
return 0; } @@ -309,19 +322,19 @@ int amdgpu_vram_mgr_query_page_status(struct ttm_resource_manager *man, struct amdgpu_vram_reservation *rsv; int ret;
- spin_lock(&mgr->lock); + mutex_lock(&mgr->lock);
list_for_each_entry(rsv, &mgr->reservations_pending, node) { - if ((rsv->mm_node.start <= start) && - (start < (rsv->mm_node.start + rsv->mm_node.size))) { + if ((rsv->start <= start) && + (start < (rsv->start + rsv->size))) { ret = -EBUSY; goto out; } }
list_for_each_entry(rsv, &mgr->reserved_pages, node) { - if ((rsv->mm_node.start <= start) && - (start < (rsv->mm_node.start + rsv->mm_node.size))) { + if ((rsv->start <= start) && + (start < (rsv->start + rsv->size))) { ret = 0; goto out; } @@ -329,32 +342,10 @@ int amdgpu_vram_mgr_query_page_status(struct ttm_resource_manager *man,
ret = -ENOENT; out: - spin_unlock(&mgr->lock); + mutex_unlock(&mgr->lock); return ret; }
-/** - * amdgpu_vram_mgr_virt_start - update virtual start address - * - * @mem: ttm_resource to update - * @node: just allocated node - * - * Calculate a virtual BO start address to easily check if everything is CPU - * accessible. - */ -static void amdgpu_vram_mgr_virt_start(struct ttm_resource *mem, - struct drm_mm_node *node) -{ - unsigned long start; - - start = node->start + node->size; - if (start > mem->num_pages) - start -= mem->num_pages; - else - start = 0; - mem->start = max(mem->start, start); -} - /** * amdgpu_vram_mgr_new - allocate new ranges * @@ -370,13 +361,13 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, const struct ttm_place *place, struct ttm_resource **res) { - unsigned long lpfn, num_nodes, pages_per_node, pages_left, pages; + unsigned long lpfn, pages_per_node, pages_left, pages, n_pages; + u64 vis_usage = 0, mem_bytes, max_bytes, min_page_size; struct amdgpu_vram_mgr *mgr = to_vram_mgr(man); struct amdgpu_device *adev = to_amdgpu_device(mgr); - uint64_t vis_usage = 0, mem_bytes, max_bytes; - struct ttm_range_mgr_node *node; - struct drm_mm *mm = &mgr->mm; - enum drm_mm_insert_mode mode; + struct amdgpu_vram_mgr_node *node; + struct drm_buddy_mm *mm = &mgr->mm; + struct drm_buddy_block *block; unsigned i; int r;
@@ -395,10 +386,9 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, goto error_sub; }
- if (place->flags & TTM_PL_FLAG_CONTIGUOUS) { + if (place->flags & TTM_PL_FLAG_CONTIGUOUS) pages_per_node = ~0ul; - num_nodes = 1; - } else { + else { #ifdef CONFIG_TRANSPARENT_HUGEPAGE pages_per_node = HPAGE_PMD_NR; #else @@ -407,11 +397,9 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, #endif pages_per_node = max_t(uint32_t, pages_per_node, tbo->page_alignment); - num_nodes = DIV_ROUND_UP_ULL(PFN_UP(mem_bytes), pages_per_node); }
- node = kvmalloc(struct_size(node, mm_nodes, num_nodes), - GFP_KERNEL | __GFP_ZERO); + node = kzalloc(sizeof(*node), GFP_KERNEL); if (!node) { r = -ENOMEM; goto error_sub; @@ -419,9 +407,17 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
ttm_resource_init(tbo, place, &node->base);
- mode = DRM_MM_INSERT_BEST; + INIT_LIST_HEAD(&node->blocks); + if (place->flags & TTM_PL_FLAG_TOPDOWN) - mode = DRM_MM_INSERT_HIGH; + node->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION; + + if (place->fpfn || lpfn != man->size) + /* Allocate blocks in desired range */ + node->flags |= DRM_BUDDY_RANGE_ALLOCATION; + + min_page_size = mgr->default_page_size; + BUG_ON(min_page_size < mm->chunk_size);
pages_left = node->base.num_pages;
@@ -429,36 +425,61 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, pages = min(pages_left, 2UL << (30 - PAGE_SHIFT));
i = 0; - spin_lock(&mgr->lock); while (pages_left) { - uint32_t alignment = tbo->page_alignment; - if (pages >= pages_per_node) - alignment = pages_per_node; - - r = drm_mm_insert_node_in_range(mm, &node->mm_nodes[i], pages, - alignment, 0, place->fpfn, - lpfn, mode); - if (unlikely(r)) { - if (pages > pages_per_node) { - if (is_power_of_2(pages)) - pages = pages / 2; - else - pages = rounddown_pow_of_two(pages); - continue; - } - goto error_free; + pages = pages_per_node; + + n_pages = pages; + + if (place->flags & TTM_PL_FLAG_CONTIGUOUS) { + n_pages = roundup_pow_of_two(n_pages); + min_page_size = (u64)n_pages << PAGE_SHIFT; + + if (n_pages > lpfn) + lpfn = n_pages; }
- vis_usage += amdgpu_vram_mgr_vis_size(adev, &node->mm_nodes[i]); - amdgpu_vram_mgr_virt_start(&node->base, &node->mm_nodes[i]); + mutex_lock(&mgr->lock); + r = drm_buddy_alloc(mm, (u64)place->fpfn << PAGE_SHIFT, + (u64)lpfn << PAGE_SHIFT, + (u64)n_pages << PAGE_SHIFT, + min_page_size, + &node->blocks, + node->flags); + mutex_unlock(&mgr->lock); + if (unlikely(r)) + goto error_free_blocks; + pages_left -= pages; ++i;
if (pages > pages_left) pages = pages_left; } - spin_unlock(&mgr->lock); + + /* Free unused pages for contiguous allocation */ + if (place->flags & TTM_PL_FLAG_CONTIGUOUS) { + u64 actual_size = (u64)node->base.num_pages << PAGE_SHIFT; + + mutex_lock(&mgr->lock); + drm_buddy_block_trim(mm, + actual_size, + &node->blocks); + mutex_unlock(&mgr->lock); + } + + list_for_each_entry(block, &node->blocks, link) + vis_usage += amdgpu_vram_mgr_vis_size(adev, block); + + block = list_first_entry_or_null(&node->blocks, + struct drm_buddy_block, + link); + if (!block) { + r = -ENOENT; + goto error_free_res; + } + + node->base.start = amdgpu_node_start(block) >> PAGE_SHIFT;
if (i == 1) node->base.placement |= TTM_PL_FLAG_CONTIGUOUS; @@ -472,12 +493,12 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, *res = &node->base; return 0;
-error_free: - while (i--) - drm_mm_remove_node(&node->mm_nodes[i]); - spin_unlock(&mgr->lock); - kvfree(node); - +error_free_blocks: + mutex_lock(&mgr->lock); + drm_buddy_free_list(mm, &node->blocks); + mutex_unlock(&mgr->lock); +error_free_res: + kfree(node); error_sub: atomic64_sub(mem_bytes, &mgr->usage); return r; @@ -494,28 +515,28 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man, struct ttm_resource *res) { - struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res); + struct amdgpu_vram_mgr_node *node = to_amdgpu_vram_mgr_node(res); struct amdgpu_vram_mgr *mgr = to_vram_mgr(man); struct amdgpu_device *adev = to_amdgpu_device(mgr); + struct drm_buddy_mm *mm = &mgr->mm; + struct drm_buddy_block *block; uint64_t usage = 0, vis_usage = 0; - unsigned i, pages;
- spin_lock(&mgr->lock); - for (i = 0, pages = res->num_pages; pages; - pages -= node->mm_nodes[i].size, ++i) { - struct drm_mm_node *mm = &node->mm_nodes[i]; - - drm_mm_remove_node(mm); - usage += mm->size << PAGE_SHIFT; - vis_usage += amdgpu_vram_mgr_vis_size(adev, mm); + mutex_lock(&mgr->lock); + list_for_each_entry(block, &node->blocks, link) { + usage += amdgpu_node_size(block); + vis_usage += amdgpu_vram_mgr_vis_size(adev, block); } + amdgpu_vram_mgr_do_reserve(man); - spin_unlock(&mgr->lock); + + drm_buddy_free_list(mm, &node->blocks); + mutex_unlock(&mgr->lock);
atomic64_sub(usage, &mgr->usage); atomic64_sub(vis_usage, &mgr->vis_usage);
- kvfree(node); + kfree(node); }
/** @@ -669,10 +690,19 @@ static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man, struct drm_printer *printer) { struct amdgpu_vram_mgr *mgr = to_vram_mgr(man); + struct drm_buddy_mm *mm = &mgr->mm; + struct drm_buddy_block *block; + + mutex_lock(&mgr->lock); + drm_printf(printer, "default_page_size: %lluKiB\n", + mgr->default_page_size >> 10);
- spin_lock(&mgr->lock); - drm_mm_print(&mgr->mm, printer); - spin_unlock(&mgr->lock); + drm_buddy_print(mm, printer); + + drm_printf(printer, "reserved:\n"); + list_for_each_entry(block, &mgr->reserved_pages, link) + drm_buddy_block_print(mm, block, printer); + mutex_unlock(&mgr->lock);
drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n", man->size, amdgpu_vram_mgr_usage(man) >> 20, @@ -696,15 +726,20 @@ int amdgpu_vram_mgr_init(struct amdgpu_device *adev) { struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr; struct ttm_resource_manager *man = &mgr->manager; + int err;
ttm_resource_manager_init(man, adev->gmc.real_vram_size >> PAGE_SHIFT);
man->func = &amdgpu_vram_mgr_func;
- drm_mm_init(&mgr->mm, 0, man->size); - spin_lock_init(&mgr->lock); + err = drm_buddy_init(&mgr->mm, man->size << PAGE_SHIFT, PAGE_SIZE); + if (err) + return err; + + mutex_init(&mgr->lock); INIT_LIST_HEAD(&mgr->reservations_pending); INIT_LIST_HEAD(&mgr->reserved_pages); + mgr->default_page_size = PAGE_SIZE;
ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, &mgr->manager); ttm_resource_manager_set_used(man, true); @@ -732,16 +767,16 @@ void amdgpu_vram_mgr_fini(struct amdgpu_device *adev) if (ret) return;
- spin_lock(&mgr->lock); + mutex_lock(&mgr->lock); list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, node) kfree(rsv);
list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, node) { - drm_mm_remove_node(&rsv->mm_node); + drm_buddy_free_list(&mgr->mm, &rsv->block); kfree(rsv); } - drm_mm_takedown(&mgr->mm); - spin_unlock(&mgr->lock); + drm_buddy_fini(&mgr->mm); + mutex_unlock(&mgr->lock);
ttm_resource_manager_cleanup(man); ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, NULL);
On 26/12/2021 22:24, Arunpravin wrote:
Move the base i915 buddy allocator code into drm
- Move i915_buddy.h to include/drm
- Move i915_buddy.c to drm root folder
- Rename "i915" string with "drm" string wherever applicable
- Rename "I915" string with "DRM" string wherever applicable
- Fix header file dependencies
- Fix alignment issues
- add Makefile support for drm buddy
- export functions and write kerneldoc description
- Remove i915 selftest config check condition as buddy selftest will be moved to drm selftest folder
cleanup i915 buddy references in i915 driver module and replace with drm buddy
v2:
- include header file in alphabetical order(Thomas)
- merged changes listed in the body section into a single patch to keep the build intact(Christian, Jani)
v3:
- make drm buddy a separate module(Thomas, Christian)
v4:
- Fix build error reported by kernel test robot lkp@intel.com
- removed i915 buddy selftest from i915_mock_selftests.h to avoid build error
- removed selftests/i915_buddy.c file as we create a new set of buddy test cases in drm/selftests folder
v5:
- Fix merge conflict issue
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com
<snip>
+int drm_buddy_init(struct drm_buddy_mm *mm, u64 size, u64 chunk_size) +{
- unsigned int i;
- u64 offset;
- if (size < chunk_size)
return -EINVAL;- if (chunk_size < PAGE_SIZE)
return -EINVAL;- if (!is_power_of_2(chunk_size))
return -EINVAL;- size = round_down(size, chunk_size);
- mm->size = size;
- mm->avail = size;
- mm->chunk_size = chunk_size;
- mm->max_order = ilog2(size) - ilog2(chunk_size);
- BUG_ON(mm->max_order > DRM_BUDDY_MAX_ORDER);
- mm->slab_blocks = KMEM_CACHE(drm_buddy_block, 0);
- if (!mm->slab_blocks)
return -ENOMEM;
It looks like every KMEM_CACHE() also creates a debugfs entry? See the error here[1]. I guess because we end with multiple instances in i915. If so, is it possible to have a single KMEM_CACHE() as part of the buddy module, similar to what i915 was doing previously?
[1] https://intel-gfx-ci.01.org/tree/drm-tip/Trybot_8217/shard-skl4/igt@i915_sel...
Am 07.01.22 um 16:49 schrieb Matthew Auld:
On 26/12/2021 22:24, Arunpravin wrote:
Move the base i915 buddy allocator code into drm
- Move i915_buddy.h to include/drm
- Move i915_buddy.c to drm root folder
- Rename "i915" string with "drm" string wherever applicable
- Rename "I915" string with "DRM" string wherever applicable
- Fix header file dependencies
- Fix alignment issues
- add Makefile support for drm buddy
- export functions and write kerneldoc description
- Remove i915 selftest config check condition as buddy selftest
will be moved to drm selftest folder
cleanup i915 buddy references in i915 driver module and replace with drm buddy
v2: - include header file in alphabetical order(Thomas) - merged changes listed in the body section into a single patch to keep the build intact(Christian, Jani)
v3: - make drm buddy a separate module(Thomas, Christian)
v4: - Fix build error reported by kernel test robot lkp@intel.com - removed i915 buddy selftest from i915_mock_selftests.h to avoid build error - removed selftests/i915_buddy.c file as we create a new set of buddy test cases in drm/selftests folder
v5: - Fix merge conflict issue
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com
<snip>
+int drm_buddy_init(struct drm_buddy_mm *mm, u64 size, u64 chunk_size) +{ + unsigned int i; + u64 offset;
+ if (size < chunk_size) + return -EINVAL;
+ if (chunk_size < PAGE_SIZE) + return -EINVAL;
+ if (!is_power_of_2(chunk_size)) + return -EINVAL;
+ size = round_down(size, chunk_size);
+ mm->size = size; + mm->avail = size; + mm->chunk_size = chunk_size; + mm->max_order = ilog2(size) - ilog2(chunk_size);
+ BUG_ON(mm->max_order > DRM_BUDDY_MAX_ORDER);
+ mm->slab_blocks = KMEM_CACHE(drm_buddy_block, 0); + if (!mm->slab_blocks) + return -ENOMEM;
It looks like every KMEM_CACHE() also creates a debugfs entry? See the error here[1]. I guess because we end with multiple instances in i915. If so, is it possible to have a single KMEM_CACHE() as part of the buddy module, similar to what i915 was doing previously?
Oh, that is a really good point, this code here doesn't make to much sense.
The value of a KMEM_CACHE() is to allow speeding up allocation of the same structure size between different drm_buddy object. If you allocate one cache per drm_buddy that makes the whole functionality useless.
Please fix, this is actually a bug.
Christian.
[1] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fintel-gfx-...
On 07/01/22 9:27 pm, Christian König wrote:
Am 07.01.22 um 16:49 schrieb Matthew Auld:
On 26/12/2021 22:24, Arunpravin wrote:
Move the base i915 buddy allocator code into drm
- Move i915_buddy.h to include/drm
- Move i915_buddy.c to drm root folder
- Rename "i915" string with "drm" string wherever applicable
- Rename "I915" string with "DRM" string wherever applicable
- Fix header file dependencies
- Fix alignment issues
- add Makefile support for drm buddy
- export functions and write kerneldoc description
- Remove i915 selftest config check condition as buddy selftest
will be moved to drm selftest folder
cleanup i915 buddy references in i915 driver module and replace with drm buddy
v2: - include header file in alphabetical order(Thomas) - merged changes listed in the body section into a single patch to keep the build intact(Christian, Jani)
v3: - make drm buddy a separate module(Thomas, Christian)
v4: - Fix build error reported by kernel test robot lkp@intel.com - removed i915 buddy selftest from i915_mock_selftests.h to avoid build error - removed selftests/i915_buddy.c file as we create a new set of buddy test cases in drm/selftests folder
v5: - Fix merge conflict issue
Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com
<snip>
+int drm_buddy_init(struct drm_buddy_mm *mm, u64 size, u64 chunk_size) +{ + unsigned int i; + u64 offset;
+ if (size < chunk_size) + return -EINVAL;
+ if (chunk_size < PAGE_SIZE) + return -EINVAL;
+ if (!is_power_of_2(chunk_size)) + return -EINVAL;
+ size = round_down(size, chunk_size);
+ mm->size = size; + mm->avail = size; + mm->chunk_size = chunk_size; + mm->max_order = ilog2(size) - ilog2(chunk_size);
+ BUG_ON(mm->max_order > DRM_BUDDY_MAX_ORDER);
+ mm->slab_blocks = KMEM_CACHE(drm_buddy_block, 0); + if (!mm->slab_blocks) + return -ENOMEM;
It looks like every KMEM_CACHE() also creates a debugfs entry? See the error here[1]. I guess because we end with multiple instances in i915. If so, is it possible to have a single KMEM_CACHE() as part of the buddy module, similar to what i915 was doing previously?
Oh, that is a really good point, this code here doesn't make to much sense.
The value of a KMEM_CACHE() is to allow speeding up allocation of the same structure size between different drm_buddy object. If you allocate one cache per drm_buddy that makes the whole functionality useless.
Please fix, this is actually a bug.
Christian.
I fixed in v7 version
Thanks, Arun
[1] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fintel-gfx-...
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Matthew Auld