[AMD Official Use Only]
Hi Matthew,
Do you have suggestions / issues for the other patches, shall we push all the
other patches into drm-misc-next.
Thanks,
Arun.
I've just gone ahead and pushed this version here to drm-misc-next.
That should at least reduce the amount of mails send back and forth.
Let me know when there are more rbs on the rest and I will push that as
well.
Thanks,
Christian.
-----Original Message-----
From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> On Behalf Of Christian
König
Sent: Wednesday, January 19, 2022 12:54 PM
To: Paneer Selvam, Arunpravin <arunpravin.paneersel...@amd.com>;
dri-de...@lists.freedesktop.org; intel-...@lists.freedesktop.org;
amd-gfx@lists.freedesktop.org
Cc: dan...@ffwll.ch; jani.nik...@linux.intel.com; matthew.a...@intel.com;
tzimmerm...@suse.de; Deucher, Alexander <alexander.deuc...@amd.com>; Koenig,
Christian <christian.koe...@amd.com>
Subject: Re: [PATCH v9 1/6] drm: move the buddy allocator from i915 into common
drm
Am 18.01.22 um 11:44 schrieb Arunpravin:
> 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 <l...@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
>
> v6:
> - replace drm_buddy_mm structure name as drm_buddy(Thomas, Christian)
> - replace drm_buddy_alloc() function name as drm_buddy_alloc_blocks()
> (Thomas)
> - replace drm_buddy_free() function name as drm_buddy_free_block()
> (Thomas)
> - export drm_buddy_free_block() function
> - fix multiple instances of KMEM_CACHE() entry
>
> v7:
> - fix warnings reported by kernel test robot <l...@intel.com>
> - modify the license(Christian)
>
> v8:
> - fix warnings reported by kernel test robot <l...@intel.com>
>
> Signed-off-by: Arunpravin <arunpravin.paneersel...@amd.com>
I've just gone ahead and pushed this version here to drm-misc-next.
That should at least reduce the amount of mails send back and forth.
Let me know when there are more rbs on the rest and I will push that as
well.
Thanks,
Christian.
> ---
> drivers/gpu/drm/Kconfig | 6 +
> drivers/gpu/drm/Makefile | 2 +
> drivers/gpu/drm/drm_buddy.c | 535 ++++++++++++
> 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 | 150 ++++
> 15 files changed, 725 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 91f54aeb0b7c..cc3e979c9c9d 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -204,6 +204,12 @@ 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 700abeb4945e..8675c2af7ae1 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -40,6 +40,8 @@ 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..d60878bc9c20
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_buddy.c
> @@ -0,0 +1,535 @@
> +// 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 kmem_cache *slab_blocks;
> +
> +static struct drm_buddy_block *drm_block_alloc(struct drm_buddy *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(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,
> + struct drm_buddy_block *block)
> +{
> + kmem_cache_free(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,
> + 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, 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->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 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);
> + 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)
> +{
> + 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);
> +}
> +EXPORT_SYMBOL(drm_buddy_fini);
> +
> +static int split_block(struct drm_buddy *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,
> + 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);
> +}
> +
> +/**
> + * drm_buddy_free_block - free a block
> + *
> + * @mm: DRM buddy manager
> + * @block: block to be freed
> + */
> +void drm_buddy_free_block(struct drm_buddy *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);
> +}
> +EXPORT_SYMBOL(drm_buddy_free_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, struct list_head *objects)
> +{
> + struct drm_buddy_block *block, *on;
> +
> + list_for_each_entry_safe(block, on, objects, link) {
> + drm_buddy_free_block(mm, block);
> + cond_resched();
> + }
> + INIT_LIST_HEAD(objects);
> +}
> +EXPORT_SYMBOL(drm_buddy_free_list);
> +
> +/**
> + * drm_buddy_alloc_blocks - 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_blocks(struct drm_buddy *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_blocks);
> +
> +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_blocks() 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,
> + 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,
> + 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, 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);
> +
> +static void drm_buddy_module_exit(void)
> +{
> + kmem_cache_destroy(slab_blocks);
> +}
> +
> +static int __init drm_buddy_module_init(void)
> +{
> + slab_blocks = KMEM_CACHE(drm_buddy_block, 0);
> + if (!slab_blocks)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +module_init(drm_buddy_module_init);
> +module_exit(drm_buddy_module_exit);
> +
> +MODULE_DESCRIPTION("DRM Buddy Allocator");
> +MODULE_LICENSE("Dual MIT/GPL");
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index b68e8b551b83..2ac220bfd0ed 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -28,6 +28,7 @@ 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..159571b9bd24 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 = 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..6ba314f9836a 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;
> 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 = &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_blocks(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 = &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 = &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..312077941411 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;
>
> /**
> * 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;
> };
>
> /**
> 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..d3b7fb4d52d1 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;
> 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;
> 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..f524db152413
> --- /dev/null
> +++ b/include/drm/drm_buddy.h
> @@ -0,0 +1,150 @@
> +/* 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 {
> + /* 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,
> + struct drm_buddy_block *block)
> +{
> + return mm->chunk_size << drm_buddy_block_order(block);
> +}
> +
> +int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size);
> +
> +void drm_buddy_fini(struct drm_buddy *mm);
> +
> +struct drm_buddy_block *
> +drm_buddy_alloc_blocks(struct drm_buddy *mm, unsigned int order);
> +
> +int drm_buddy_alloc_range(struct drm_buddy *mm,
> + struct list_head *blocks,
> + u64 start, u64 size);
> +
> +void drm_buddy_free_block(struct drm_buddy *mm, struct drm_buddy_block
> *block);
> +
> +void drm_buddy_free_list(struct drm_buddy *mm, struct list_head *objects);
> +
> +void drm_buddy_print(struct drm_buddy *mm, struct drm_printer *p);
> +void drm_buddy_block_print(struct drm_buddy *mm,
> + struct drm_buddy_block *block,
> + struct drm_printer *p);
> +
> +#endif
>
> base-commit: 6b79f96f4a23846516e5e6e4dd37fc06f43a60dd
