[Intel-gfx] [PATCH v12] drm/amdgpu: add drm buddy support to amdgpu
Christian König
christian.koenig at amd.com
Thu Apr 7 06:10:21 UTC 2022
Am 07.04.22 um 07:46 schrieb Arunpravin Paneer Selvam:
> - Switch to drm buddy allocator
> - Add resource 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
>
> v4:
> - fix warnings reported by kernel test robot <lkp at intel.com>
>
> v5:
> - fix merge conflict issue
>
> v6:
> - fix warnings reported by kernel test robot <lkp at intel.com>
>
> v7:
> - remove DRM_BUDDY_RANGE_ALLOCATION flag usage
>
> v8:
> - keep DRM_BUDDY_RANGE_ALLOCATION flag usage
> - resolve conflicts created by drm/amdgpu: remove VRAM accounting v2
>
> v9(Christian):
> - merged the below patch
> - drm/amdgpu: move vram inline functions into a header
> - rename label name as fallback
> - move struct amdgpu_vram_mgr to amdgpu_vram_mgr.h
> - remove unnecessary flags from struct amdgpu_vram_reservation
> - rewrite block NULL check condition
> - change else style as per coding standard
> - rewrite the node max size
> - add a helper function to fetch the first entry from the list
>
> v10(Christian):
> - rename amdgpu_get_node() function name as amdgpu_vram_mgr_first_block
>
> v11:
> - if size is not aligned with min_page_size, enable is_contiguous flag,
> therefore, the size round up to the power of two and trimmed to the
> original size.
> v12:
> - rename the function names having prefix as amdgpu_vram_mgr_*()
> - modify the round_up() logic conforming to contiguous flag enablement
> or if size is not aligned to min_block_size
> - modify the trim logic
> - rename node as block wherever applicable
>
> Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam at amd.com>
Acked-by: Christian König <christian.koenig at amd.com>
I don't have time for a detailed in depth review, but this has seen
enough iterations that I trust it to work fine.
Please check if the drm_buddy work has already backmerged into
amd-staging-drm-next. If not maybe ping Alex when that is planned or
alternatively I can push it through drm-misc-next.
Thanks,
Christian.
> ---
> drivers/gpu/drm/Kconfig | 1 +
> .../gpu/drm/amd/amdgpu/amdgpu_res_cursor.h | 97 ++++-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 10 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 359 ++++++++++--------
> 4 files changed, 291 insertions(+), 176 deletions(-)
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index f1422bee3dcc..5133c3f028ab 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -280,6 +280,7 @@ 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..6546552e596c 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 fallback;
>
> 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_resource(res)->blocks;
> +
> + block = list_first_entry_or_null(head,
> + struct drm_buddy_block,
> + link);
> + if (!block)
> + goto fallback;
> +
> + while (start >= amdgpu_vram_mgr_block_size(block)) {
> + start -= amdgpu_vram_mgr_block_size(block);
> +
> + next = block->link.next;
> + if (next != head)
> + block = list_entry(next, struct drm_buddy_block, link);
> + }
> +
> + cur->start = amdgpu_vram_mgr_block_start(block) + start;
> + cur->size = min(amdgpu_vram_mgr_block_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 fallback;
> + }
>
> - cur->start = (node->start << PAGE_SHIFT) + start;
> - cur->size = min((node->size << PAGE_SHIFT) - start, size);
> + return;
> +
> +fallback:
> + 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_vram_mgr_block_start(block);
> + cur->size = min(amdgpu_vram_mgr_block_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 9120ae80ef52..6a70818039dd 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 "amdgpu_vram_mgr.h"
> #include "amdgpu.h"
>
> #define AMDGPU_PL_GDS (TTM_PL_PRIV + 0)
> @@ -38,15 +39,6 @@
>
> #define AMDGPU_POISON 0xd0bed0be
>
> -struct amdgpu_vram_mgr {
> - struct ttm_resource_manager manager;
> - struct drm_mm mm;
> - spinlock_t lock;
> - struct list_head reservations_pending;
> - struct list_head reserved_pages;
> - atomic64_t vis_usage;
> -};
> -
> struct amdgpu_gtt_mgr {
> struct ttm_resource_manager manager;
> struct drm_mm mm;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> index 0a7611648573..49e4092f447f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> @@ -32,8 +32,10 @@
> #include "atom.h"
>
> struct amdgpu_vram_reservation {
> - struct list_head node;
> - struct drm_mm_node mm_node;
> + u64 start;
> + u64 size;
> + struct list_head allocated;
> + struct list_head blocks;
> };
>
> static inline struct amdgpu_vram_mgr *
> @@ -186,18 +188,18 @@ const struct attribute_group amdgpu_vram_mgr_attr_group = {
> };
>
> /**
> - * amdgpu_vram_mgr_vis_size - Calculate visible node size
> + * amdgpu_vram_mgr_vis_size - Calculate visible block size
> *
> * @adev: amdgpu_device pointer
> - * @node: MM node structure
> + * @block: DRM BUDDY block structure
> *
> - * Calculate how many bytes of the MM node are inside visible VRAM
> + * Calculate how many bytes of the DRM BUDDY block 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_vram_mgr_block_start(block);
> + u64 end = start + amdgpu_vram_mgr_block_size(block);
>
> if (start >= adev->gmc.visible_vram_size)
> return 0;
> @@ -218,9 +220,9 @@ 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_resource *vres = to_amdgpu_vram_mgr_resource(res);
> + struct drm_buddy_block *block;
> + u64 usage = 0;
>
> if (amdgpu_gmc_vram_full_visible(&adev->gmc))
> return amdgpu_bo_size(bo);
> @@ -228,9 +230,8 @@ 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, &vres->blocks, link)
> + usage += amdgpu_vram_mgr_vis_size(adev, block);
>
> return usage;
> }
> @@ -240,23 +241,30 @@ 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 = &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))
> + list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks) {
> + if (drm_buddy_alloc_blocks(mm, rsv->start, rsv->start + rsv->size,
> + rsv->size, mm->chunk_size, &rsv->allocated,
> + DRM_BUDDY_RANGE_ALLOCATION))
> + continue;
> +
> + block = amdgpu_vram_mgr_first_block(&rsv->allocated);
> + if (!block)
> continue;
>
> dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
> - rsv->mm_node.start, rsv->mm_node.size);
> + rsv->start, rsv->size);
>
> - vis_usage = amdgpu_vram_mgr_vis_size(adev, &rsv->mm_node);
> + vis_usage = amdgpu_vram_mgr_vis_size(adev, block);
> atomic64_add(vis_usage, &mgr->vis_usage);
> spin_lock(&man->bdev->lru_lock);
> - man->usage += rsv->mm_node.size << PAGE_SHIFT;
> + man->usage += rsv->size;
> spin_unlock(&man->bdev->lru_lock);
> - list_move(&rsv->node, &mgr->reserved_pages);
> + list_move(&rsv->blocks, &mgr->reserved_pages);
> }
> }
>
> @@ -278,14 +286,16 @@ int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr,
> if (!rsv)
> 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->allocated);
> + INIT_LIST_HEAD(&rsv->blocks);
>
> - spin_lock(&mgr->lock);
> - list_add_tail(&rsv->node, &mgr->reservations_pending);
> + rsv->start = start;
> + rsv->size = size;
> +
> + mutex_lock(&mgr->lock);
> + list_add_tail(&rsv->blocks, &mgr->reservations_pending);
> amdgpu_vram_mgr_do_reserve(&mgr->manager);
> - spin_unlock(&mgr->lock);
> + mutex_unlock(&mgr->lock);
>
> return 0;
> }
> @@ -307,19 +317,19 @@ int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
> 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))) {
> + list_for_each_entry(rsv, &mgr->reservations_pending, blocks) {
> + 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))) {
> + list_for_each_entry(rsv, &mgr->reserved_pages, blocks) {
> + if (rsv->start <= start &&
> + (start < (rsv->start + rsv->size))) {
> ret = 0;
> goto out;
> }
> @@ -327,32 +337,10 @@ int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
>
> 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
> *
> @@ -368,46 +356,44 @@ 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;
> + u64 vis_usage = 0, max_bytes, cur_size, min_block_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;
> - unsigned i;
> + struct amdgpu_vram_mgr_resource *vres;
> + u64 size, remaining_size, lpfn, fpfn;
> + struct drm_buddy *mm = &mgr->mm;
> + struct drm_buddy_block *block;
> + unsigned long pages_per_block;
> int r;
>
> - lpfn = place->lpfn;
> + lpfn = place->lpfn << PAGE_SHIFT;
> if (!lpfn)
> - lpfn = man->size >> PAGE_SHIFT;
> + lpfn = man->size;
> +
> + fpfn = place->fpfn << PAGE_SHIFT;
>
> max_bytes = adev->gmc.mc_vram_size;
> if (tbo->type != ttm_bo_type_kernel)
> max_bytes -= AMDGPU_VM_RESERVED_VRAM;
>
> - mem_bytes = tbo->base.size;
> if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
> - pages_per_node = ~0ul;
> - num_nodes = 1;
> + pages_per_block = ~0ul;
> } else {
> #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> - pages_per_node = HPAGE_PMD_NR;
> + pages_per_block = HPAGE_PMD_NR;
> #else
> /* default to 2MB */
> - pages_per_node = 2UL << (20UL - PAGE_SHIFT);
> + pages_per_block = 2UL << (20UL - PAGE_SHIFT);
> #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);
> + pages_per_block = max_t(uint32_t, pages_per_block,
> + tbo->page_alignment);
> }
>
> - node = kvmalloc(struct_size(node, mm_nodes, num_nodes),
> - GFP_KERNEL | __GFP_ZERO);
> - if (!node)
> + vres = kzalloc(sizeof(*vres), GFP_KERNEL);
> + if (!vres)
> return -ENOMEM;
>
> - ttm_resource_init(tbo, place, &node->base);
> + ttm_resource_init(tbo, place, &vres->base);
>
> /* bail out quickly if there's likely not enough VRAM for this BO */
> if (ttm_resource_manager_usage(man) > max_bytes) {
> @@ -415,66 +401,130 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
> goto error_fini;
> }
>
> - mode = DRM_MM_INSERT_BEST;
> + INIT_LIST_HEAD(&vres->blocks);
> +
> if (place->flags & TTM_PL_FLAG_TOPDOWN)
> - mode = DRM_MM_INSERT_HIGH;
> -
> - pages_left = node->base.num_pages;
> -
> - /* Limit maximum size to 2GB due to SG table limitations */
> - 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;
> + vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
> +
> + if (fpfn || lpfn != man->size)
> + /* Allocate blocks in desired range */
> + vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
> +
> + remaining_size = vres->base.num_pages << PAGE_SHIFT;
> +
> + mutex_lock(&mgr->lock);
> + while (remaining_size) {
> + if (tbo->page_alignment)
> + min_block_size = tbo->page_alignment << PAGE_SHIFT;
> + else
> + min_block_size = mgr->default_page_size;
> +
> + BUG_ON(min_block_size < mm->chunk_size);
> +
> + /* Limit maximum size to 2GiB due to SG table limitations */
> + size = min(remaining_size, 2ULL << 30);
> +
> + if (size >= pages_per_block << PAGE_SHIFT)
> + min_block_size = pages_per_block << PAGE_SHIFT;
> +
> + cur_size = size;
> +
> + if (fpfn + size != place->lpfn << PAGE_SHIFT) {
> + /*
> + * Except for actual range allocation, modify the size and
> + * min_block_size conforming to continuous flag enablement
> + */
> + if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
> + size = roundup_pow_of_two(size);
> + min_block_size = size;
> + /*
> + * Modify the size value if size is not
> + * aligned with min_block_size
> + */
> + } else if (!IS_ALIGNED(size, min_block_size)) {
> + size = round_up(size, min_block_size);
> }
> - goto error_free;
> }
>
> - vis_usage += amdgpu_vram_mgr_vis_size(adev, &node->mm_nodes[i]);
> - amdgpu_vram_mgr_virt_start(&node->base, &node->mm_nodes[i]);
> - pages_left -= pages;
> - ++i;
> + r = drm_buddy_alloc_blocks(mm, fpfn,
> + lpfn,
> + size,
> + min_block_size,
> + &vres->blocks,
> + vres->flags);
> + if (unlikely(r))
> + goto error_free_blocks;
> +
> + if (size > remaining_size)
> + remaining_size = 0;
> + else
> + remaining_size -= size;
> + }
> + mutex_unlock(&mgr->lock);
> +
> + if (cur_size != size) {
> + struct drm_buddy_block *block;
> + struct list_head *trim_list;
> + u64 original_size;
> + LIST_HEAD(temp);
> +
> + trim_list = &vres->blocks;
> + original_size = vres->base.num_pages << PAGE_SHIFT;
> +
> + /*
> + * If size value is rounded up to min_block_size, trim the last
> + * block to the required size
> + */
> + if (!list_is_singular(&vres->blocks)) {
> + block = list_last_entry(&vres->blocks, typeof(*block), link);
> + list_move_tail(&block->link, &temp);
> + trim_list = &temp;
> + /*
> + * Compute the original_size value by subtracting the
> + * last block size with (aligned size - original size)
> + */
> + original_size = amdgpu_vram_mgr_block_size(block) - (size - cur_size);
> + }
>
> - if (pages > pages_left)
> - pages = pages_left;
> + mutex_lock(&mgr->lock);
> + drm_buddy_block_trim(mm,
> + original_size,
> + trim_list);
> + mutex_unlock(&mgr->lock);
> +
> + if (!list_empty(&temp))
> + list_splice_tail(trim_list, &vres->blocks);
> + }
> +
> + list_for_each_entry(block, &vres->blocks, link)
> + vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
> +
> + block = amdgpu_vram_mgr_first_block(&vres->blocks);
> + if (!block) {
> + r = -EINVAL;
> + goto error_fini;
> }
> - spin_unlock(&mgr->lock);
>
> - if (i == 1)
> - node->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
> + vres->base.start = amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
> +
> + if (amdgpu_is_vram_mgr_blocks_contiguous(&vres->blocks))
> + vres->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
>
> if (adev->gmc.xgmi.connected_to_cpu)
> - node->base.bus.caching = ttm_cached;
> + vres->base.bus.caching = ttm_cached;
> else
> - node->base.bus.caching = ttm_write_combined;
> + vres->base.bus.caching = ttm_write_combined;
>
> atomic64_add(vis_usage, &mgr->vis_usage);
> - *res = &node->base;
> + *res = &vres->base;
> return 0;
>
> -error_free:
> - while (i--)
> - drm_mm_remove_node(&node->mm_nodes[i]);
> - spin_unlock(&mgr->lock);
> +error_free_blocks:
> + drm_buddy_free_list(mm, &vres->blocks);
> + mutex_unlock(&mgr->lock);
> error_fini:
> - ttm_resource_fini(man, &node->base);
> - kvfree(node);
> + ttm_resource_fini(man, &vres->base);
> + kfree(vres);
>
> return r;
> }
> @@ -490,27 +540,26 @@ 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_resource *vres = to_amdgpu_vram_mgr_resource(res);
> struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
> struct amdgpu_device *adev = to_amdgpu_device(mgr);
> + struct drm_buddy *mm = &mgr->mm;
> + struct drm_buddy_block *block;
> uint64_t 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];
> + mutex_lock(&mgr->lock);
> + list_for_each_entry(block, &vres->blocks, link)
> + vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
>
> - drm_mm_remove_node(mm);
> - vis_usage += amdgpu_vram_mgr_vis_size(adev, mm);
> - }
> amdgpu_vram_mgr_do_reserve(man);
> - spin_unlock(&mgr->lock);
> +
> + drm_buddy_free_list(mm, &vres->blocks);
> + mutex_unlock(&mgr->lock);
>
> atomic64_sub(vis_usage, &mgr->vis_usage);
>
> ttm_resource_fini(man, res);
> - kvfree(node);
> + kfree(vres);
> }
>
> /**
> @@ -542,7 +591,7 @@ int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
> if (!*sgt)
> return -ENOMEM;
>
> - /* Determine the number of DRM_MM nodes to export */
> + /* Determine the number of DRM_BUDDY blocks to export */
> amdgpu_res_first(res, offset, length, &cursor);
> while (cursor.remaining) {
> num_entries++;
> @@ -558,10 +607,10 @@ int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
> sg->length = 0;
>
> /*
> - * Walk down DRM_MM nodes to populate scatterlist nodes
> - * @note: Use iterator api to get first the DRM_MM node
> + * Walk down DRM_BUDDY blocks to populate scatterlist nodes
> + * @note: Use iterator api to get first the DRM_BUDDY block
> * and the number of bytes from it. Access the following
> - * DRM_MM node(s) if more buffer needs to exported
> + * DRM_BUDDY block(s) if more buffer needs to exported
> */
> amdgpu_res_first(res, offset, length, &cursor);
> for_each_sgtable_sg((*sgt), sg, i) {
> @@ -648,13 +697,22 @@ 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 = &mgr->mm;
> + struct drm_buddy_block *block;
>
> drm_printf(printer, " vis usage:%llu\n",
> amdgpu_vram_mgr_vis_usage(mgr));
>
> - spin_lock(&mgr->lock);
> - drm_mm_print(&mgr->mm, printer);
> - spin_unlock(&mgr->lock);
> + mutex_lock(&mgr->lock);
> + drm_printf(printer, "default_page_size: %lluKiB\n",
> + mgr->default_page_size >> 10);
> +
> + 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);
> }
>
> static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
> @@ -674,16 +732,21 @@ 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->mman.bdev,
> adev->gmc.real_vram_size);
>
> man->func = &amdgpu_vram_mgr_func;
>
> - drm_mm_init(&mgr->mm, 0, man->size >> PAGE_SHIFT);
> - spin_lock_init(&mgr->lock);
> + err = drm_buddy_init(&mgr->mm, man->size, 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);
> @@ -711,16 +774,16 @@ void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
> if (ret)
> return;
>
> - spin_lock(&mgr->lock);
> - list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, node)
> + mutex_lock(&mgr->lock);
> + list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks)
> kfree(rsv);
>
> - list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, node) {
> - drm_mm_remove_node(&rsv->mm_node);
> + list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, blocks) {
> + drm_buddy_free_list(&mgr->mm, &rsv->blocks);
> 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);
>
> base-commit: bc38e5d45dd513fa384bbedab3c0749f2e46771b
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