Re: [PATCH v13 5/5] drm/amdgpu: add drm buddy support to amdgpu

Am 21.02.22 um 17:45 schrieb Arunpravin:

• Remove drm_mm references and replace with drm buddy functionalities
• Add res cursor support for drm buddy

v2(Matthew Auld):

• replace spinlock with mutex as we call kmem_cache_zalloc (..., GFP_KERNEL) in drm_buddy_alloc() function

• lock drm_buddy_block_trim() function as it calls mark_free/mark_split are all globally visible

v3(Matthew Auld):

• remove trim method error handling as we address the failure case at drm_buddy_block_trim() function

v4:

• fix warnings reported by kernel test robot lkp@intel.com

v5:

• fix merge conflict issue

v6:

• fix warnings reported by kernel test robot lkp@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

Signed-off-by: Arunpravin Arunpravin.PaneerSelvam@amd.com

drivers/gpu/drm/Kconfig | 1 + .../gpu/drm/amd/amdgpu/amdgpu_res_cursor.h | 97 +++++-- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 7 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 256 ++++++++++-------- 4 files changed, 229 insertions(+), 132 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 763355330b17..019ec0440ced 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -279,6 +279,7 @@ config DRM_AMDGPU select HWMON select BACKLIGHT_CLASS_DEVICE select INTERVAL_TREE

• select DRM_BUDDY help Choose this option if you have a recent AMD Radeon graphics card.

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h index acfa207cf970..da12b4ff2e45 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h @@ -30,12 +30,15 @@ #include <drm/ttm/ttm_resource.h> #include <drm/ttm/ttm_range_manager.h>

+#include "amdgpu_vram_mgr.h"

• /* state back for walking over vram_mgr and gtt_mgr allocations */ struct amdgpu_res_cursor { uint64_t start; uint64_t size; uint64_t remaining;

• struct drm_mm_node *node;

• void *node;

• uint32_t mem_type; };

  /**

@@ -52,27 +55,63 @@ static inline void amdgpu_res_first(struct ttm_resource *res, uint64_t start, uint64_t size, struct amdgpu_res_cursor *cur) {

• struct drm_buddy_block *block;
• struct list_head *head, *next; struct drm_mm_node *node;

• if (!res || res->mem_type == TTM_PL_SYSTEM) {

• cur->start = start;
  

• cur->size = size;
  

• cur->remaining = size;
  

• cur->node = NULL;
  

• WARN_ON(res && start + size > res->num_pages << PAGE_SHIFT);
  

• return;
  

• }

• if (!res)

• goto err_out;
  

It's not really an error to not have a resource. So I would rather name the label fallback or something like that.

BUG_ON(start + size > res->num_pages << PAGE_SHIFT);

• node = to_ttm_range_mgr_node(res)->mm_nodes;
• while (start >= node->size << PAGE_SHIFT)

• start -= node++->size << PAGE_SHIFT;
  

• cur->mem_type = res->mem_type;
• switch (cur->mem_type) {
• case TTM_PL_VRAM:

• head = &to_amdgpu_vram_mgr_node(res)->blocks;
  

• block = list_first_entry_or_null(head,
  

• 				 struct drm_buddy_block,
  

• 				 link);
  

• if (!block)
  

• 	goto err_out;
  

• while (start >= amdgpu_node_size(block)) {
  

• 	start -= amdgpu_node_size(block);
  

• 	next = block->link.next;
  

• 	if (next != head)
  

• 		block = list_entry(next, struct drm_buddy_block, link);
  

• }
  

• cur->start = amdgpu_node_start(block) + start;
  

• cur->size = min(amdgpu_node_size(block) - start, size);
  

• cur->remaining = size;
  

• cur->node = block;
  

• break;
  

• case TTM_PL_TT:

• node = to_ttm_range_mgr_node(res)->mm_nodes;
  

• while (start >= node->size << PAGE_SHIFT)
  

• 	start -= node++->size << PAGE_SHIFT;
  

• cur->start = (node->start << PAGE_SHIFT) + start;
  

• cur->size = min((node->size << PAGE_SHIFT) - start, size);
  

• cur->remaining = size;
  

• cur->node = node;
  

• break;
  

• default:

• goto err_out;
  

• }

• cur->start = (node->start << PAGE_SHIFT) + start;
• cur->size = min((node->size << PAGE_SHIFT) - start, size);

• return;

+err_out:

• cur->start = start;
• cur->size = size; cur->remaining = size;

• cur->node = node;

• cur->node = NULL;

• WARN_ON(res && start + size > res->num_pages << PAGE_SHIFT);

• return; }

  /**

@@ -85,7 +124,9 @@ static inline void amdgpu_res_first(struct ttm_resource *res, */ static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size) {

• struct drm_mm_node *node = cur->node;

• struct drm_buddy_block *block;

• struct drm_mm_node *node;

• struct list_head *next;

  BUG_ON(size > cur->remaining);

@@ -99,9 +140,27 @@ static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size) return; }

• cur->node = ++node;
• cur->start = node->start << PAGE_SHIFT;
• cur->size = min(node->size << PAGE_SHIFT, cur->remaining);

• switch (cur->mem_type) {

• case TTM_PL_VRAM:

• block = cur->node;
  

• next = block->link.next;
  

• block = list_entry(next, struct drm_buddy_block, link);
  

• cur->node = block;
  

• cur->start = amdgpu_node_start(block);
  

• cur->size = min(amdgpu_node_size(block), cur->remaining);
  

• break;
  

• case TTM_PL_TT:

• node = cur->node;
  

• cur->node = ++node;
  

• cur->start = node->start << PAGE_SHIFT;
  

• cur->size = min(node->size << PAGE_SHIFT, cur->remaining);
  

• break;
  

• default:

• return;
  

• } }

  #endif

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h index 9120ae80ef52..8acdb2fb3a23 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h @@ -26,6 +26,7 @@

#include <linux/dma-direction.h> #include <drm/gpu_scheduler.h> +#include <drm/drm_buddy.h> #include "amdgpu.h"

#define AMDGPU_PL_GDS (TTM_PL_PRIV + 0) @@ -40,11 +41,13 @@

struct amdgpu_vram_mgr { struct ttm_resource_manager manager;

• struct drm_mm mm;
• spinlock_t lock;

• struct drm_buddy mm;
• /* protects access to buffer objects */
• struct mutex lock; struct list_head reservations_pending; struct list_head reserved_pages; atomic64_t vis_usage;
• u64 default_page_size; };

Can we move that to amdgpu_vram_mgr.h as well?

struct amdgpu_gtt_mgr { diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c index 0a7611648573..6b2a5879e985 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c @@ -32,8 +32,11 @@ #include "atom.h"

struct amdgpu_vram_reservation {

• u64 start;
• u64 size;
• unsigned long flags;

Looks like we will always use the same flags and that can be dropped.

• struct list_head block; struct list_head node;

• struct drm_mm_node mm_node; };

  static inline struct amdgpu_vram_mgr *

@@ -194,10 +197,10 @@ const struct attribute_group amdgpu_vram_mgr_attr_group = {

• Calculate how many bytes of the MM node are inside visible VRAM

*/ static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,

• 		    struct drm_mm_node *node)
  

• 		    struct drm_buddy_block *block)
  

  {

• uint64_t start = node->start << PAGE_SHIFT;
• uint64_t end = (node->size + node->start) << PAGE_SHIFT;

• u64 start = amdgpu_node_start(block);

• u64 end = start + amdgpu_node_size(block);

  if (start >= adev->gmc.visible_vram_size) return 0;

@@ -218,9 +221,9 @@ u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo) { struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); struct ttm_resource *res = bo->tbo.resource;

• unsigned pages = res->num_pages;
• struct drm_mm_node *mm;
• u64 usage;

• struct amdgpu_vram_mgr_node *node = to_amdgpu_vram_mgr_node(res);

• struct drm_buddy_block *block;

• u64 usage = 0;

  if (amdgpu_gmc_vram_full_visible(&adev->gmc)) return amdgpu_bo_size(bo);

@@ -228,9 +231,8 @@ u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo) if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT) return 0;

• mm = &container_of(res, struct ttm_range_mgr_node, base)->mm_nodes[0];
• for (usage = 0; pages; pages -= mm->size, mm++)

• usage += amdgpu_vram_mgr_vis_size(adev, mm);
  

• list_for_each_entry(block, &node->blocks, link)

• usage += amdgpu_vram_mgr_vis_size(adev, block);
  
  

  return usage; }

@@ -240,23 +242,31 @@ 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))
  

• if (drm_buddy_alloc_blocks(mm, rsv->start, rsv->start + rsv->size,
  

• 			   rsv->size, mm->chunk_size, &rsv->block,
  

• 			   rsv->flags))
  continue;
  
  

• dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
  

• 	rsv->mm_node.start, rsv->mm_node.size);
  

• vis_usage = amdgpu_vram_mgr_vis_size(adev, &rsv->mm_node);
  

• atomic64_add(vis_usage, &mgr->vis_usage);
  

• spin_lock(&man->bdev->lru_lock);
  

• man->usage += rsv->mm_node.size << PAGE_SHIFT;
  

• spin_unlock(&man->bdev->lru_lock);
  

• list_move(&rsv->node, &mgr->reserved_pages);
  

• block = list_first_entry_or_null(&rsv->block,
  

• 				 struct drm_buddy_block,
  

• 				 link);
  

• if (block) {
  

Rather make that an "if (!block) continue;".

• 	dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
  

• 		rsv->start, rsv->size);
  

• 	vis_usage = amdgpu_vram_mgr_vis_size(adev, block);
  

• 	atomic64_add(vis_usage, &mgr->vis_usage);
  

• 	spin_lock(&man->bdev->lru_lock);
  

• 	man->usage += rsv->size;
  

• 	spin_unlock(&man->bdev->lru_lock);
  

• 	list_move(&rsv->node, &mgr->reserved_pages);
  

• }
  

  } }

@@ -279,13 +289,16 @@ int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr, return -ENOMEM;

INIT_LIST_HEAD(&rsv->node);

• rsv->mm_node.start = start >> PAGE_SHIFT;
• rsv->mm_node.size = size >> PAGE_SHIFT;

• INIT_LIST_HEAD(&rsv->block);
• rsv->start = start;
• rsv->size = size;
• rsv->flags |= DRM_BUDDY_RANGE_ALLOCATION;

• spin_lock(&mgr->lock);

• mutex_lock(&mgr->lock); list_add_tail(&rsv->node, &mgr->reservations_pending); amdgpu_vram_mgr_do_reserve(&mgr->manager);

• spin_unlock(&mgr->lock);

• mutex_unlock(&mgr->lock);

  return 0; }

@@ -307,19 +320,19 @@ 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))) {
  

• if (rsv->start <= start &&
  

•     (start < (rsv->start + rsv->size))) {
  ret = -EBUSY;
  goto out;
  

  } }

  list_for_each_entry(rsv, &mgr->reserved_pages, node) {

• if ((rsv->mm_node.start <= start) &&
  

•     (start < (rsv->mm_node.start + rsv->mm_node.size))) {
  

• if (rsv->start <= start &&
  

•     (start < (rsv->start + rsv->size))) {
  ret = 0;
  goto out;
  

  }

@@ -327,32 +340,10 @@ 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

@@ -368,13 +359,13 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, const struct ttm_place *place, struct ttm_resource **res) {

• unsigned long lpfn, num_nodes, pages_per_node, pages_left, pages;

• unsigned long lpfn, pages_per_node, pages_left, pages, n_pages;
• u64 vis_usage = 0, mem_bytes, max_bytes, min_page_size; struct amdgpu_vram_mgr *mgr = to_vram_mgr(man); struct amdgpu_device *adev = to_amdgpu_device(mgr);

• uint64_t vis_usage = 0, mem_bytes, max_bytes;
• struct ttm_range_mgr_node *node;
• struct drm_mm *mm = &mgr->mm;
• enum drm_mm_insert_mode mode;

• struct amdgpu_vram_mgr_node *node;
• struct drm_buddy *mm = &mgr->mm;
• struct drm_buddy_block *block; unsigned i; int r;

@@ -387,10 +378,9 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, max_bytes -= AMDGPU_VM_RESERVED_VRAM;

mem_bytes = tbo->base.size;

• if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {

• if (place->flags & TTM_PL_FLAG_CONTIGUOUS) pages_per_node = ~0ul;

• num_nodes = 1;
  

• } else {

• else {

Please keep the } else { here, see coding style rules.

#ifdef CONFIG_TRANSPARENT_HUGEPAGE pages_per_node = HPAGE_PMD_NR; #else @@ -399,11 +389,9 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, #endif pages_per_node = max_t(uint32_t, pages_per_node, tbo->page_alignment);

• num_nodes = DIV_ROUND_UP_ULL(PFN_UP(mem_bytes), pages_per_node);
  

  }

• node = kvmalloc(struct_size(node, mm_nodes, num_nodes),

• 	GFP_KERNEL | __GFP_ZERO);
  

• node = kzalloc(sizeof(*node), GFP_KERNEL); if (!node) return -ENOMEM;

@@ -415,9 +403,17 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, goto error_fini; }

• mode = DRM_MM_INSERT_BEST;

• INIT_LIST_HEAD(&node->blocks);
• if (place->flags & TTM_PL_FLAG_TOPDOWN)

• mode = DRM_MM_INSERT_HIGH;
  

• node->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
  

• if (place->fpfn || lpfn != man->size >> PAGE_SHIFT)

• /* Allocate blocks in desired range */
  

• node->flags |= DRM_BUDDY_RANGE_ALLOCATION;
  

• min_page_size = mgr->default_page_size;

• BUG_ON(min_page_size < mm->chunk_size);

  pages_left = node->base.num_pages;

@@ -425,36 +421,61 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, pages = min(pages_left, 2UL << (30 - PAGE_SHIFT));

i = 0;

• spin_lock(&mgr->lock); while (pages_left) {

• uint32_t alignment = tbo->page_alignment;
  

• if (pages >= pages_per_node)

• 	alignment = pages_per_node;
  

• r = drm_mm_insert_node_in_range(mm, &node->mm_nodes[i], pages,
  

• 				alignment, 0, place->fpfn,
  

• 				lpfn, mode);
  

• if (unlikely(r)) {
  

• 	if (pages > pages_per_node) {
  

• 		if (is_power_of_2(pages))
  

• 			pages = pages / 2;
  

• 		else
  

• 			pages = rounddown_pow_of_two(pages);
  

• 		continue;
  

• 	}
  

• 	goto error_free;
  

• 	pages = pages_per_node;
  

When I see that correctly then this is a rather bad idea.

That would limit each allocated block to only 2MiB, but we really want allocations up to 1GiB!

• n_pages = pages;
  

• if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
  

• 	n_pages = roundup_pow_of_two(n_pages);
  

• 	min_page_size = (u64)n_pages << PAGE_SHIFT;
  

• 	if (n_pages > lpfn)
  

• 		lpfn = n_pages;
  

  }

• vis_usage += amdgpu_vram_mgr_vis_size(adev, &node->mm_nodes[i]);
  

• amdgpu_vram_mgr_virt_start(&node->base, &node->mm_nodes[i]);
  

• mutex_lock(&mgr->lock);
  

• r = drm_buddy_alloc_blocks(mm, (u64)place->fpfn << PAGE_SHIFT,
  

• 			   (u64)lpfn << PAGE_SHIFT,
  

• 			   (u64)n_pages << PAGE_SHIFT,
  

• 			   min_page_size,
  

• 			   &node->blocks,
  

• 			   node->flags);
  

• mutex_unlock(&mgr->lock);
  

• if (unlikely(r))
  

• 	goto error_free_blocks;
  

• pages_left -= pages; ++i;

  if (pages > pages_left) pages = pages_left; }

• spin_unlock(&mgr->lock);

• /* Free unused pages for contiguous allocation */
• if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {

• u64 actual_size = (u64)node->base.num_pages << PAGE_SHIFT;
  

• mutex_lock(&mgr->lock);
  

• drm_buddy_block_trim(mm,
  

• 		     actual_size,
  

• 		     &node->blocks);
  

• mutex_unlock(&mgr->lock);
  

• }
• list_for_each_entry(block, &node->blocks, link)

• vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
  

• block = list_first_entry_or_null(&node->blocks,

• 			 struct drm_buddy_block,
  

• 			 link);
  

This is a repeating patter, you should probably add a helper function for it.

Regards, Christian.

• if (!block) {

• r = -EINVAL;
  

• goto error_fini;
  

• }

• node->base.start = amdgpu_node_start(block) >> PAGE_SHIFT;

  if (i == 1) node->base.placement |= TTM_PL_FLAG_CONTIGUOUS;

@@ -468,13 +489,13 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, *res = &node->base; return 0;

-error_free:

• while (i--)

• drm_mm_remove_node(&node->mm_nodes[i]);
  

• spin_unlock(&mgr->lock);

+error_free_blocks:

• mutex_lock(&mgr->lock);
• drm_buddy_free_list(mm, &node->blocks);
• mutex_unlock(&mgr->lock); error_fini: ttm_resource_fini(man, &node->base);

• kvfree(node);

• kfree(node);

  return r; }

@@ -490,27 +511,26 @@ 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_node *node = to_amdgpu_vram_mgr_node(res); struct amdgpu_vram_mgr *mgr = to_vram_mgr(man); struct amdgpu_device *adev = to_amdgpu_device(mgr);
• struct drm_buddy *mm = &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, &node->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, &node->blocks);

• mutex_unlock(&mgr->lock);

  atomic64_sub(vis_usage, &mgr->vis_usage);

  ttm_resource_fini(man, res);

• kvfree(node);

• kfree(node); }

  /**

@@ -648,13 +668,22 @@ 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 +703,21 @@ 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 +745,16 @@ void amdgpu_vram_mgr_fini(struct amdgpu_device *adev) if (ret) return;

• spin_lock(&mgr->lock);

• mutex_lock(&mgr->lock); list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, node) kfree(rsv);

  list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, node) {

• drm_mm_remove_node(&rsv->mm_node);
  

• drm_buddy_free_list(&mgr->mm, &rsv->block);
  

  kfree(rsv); }

• drm_mm_takedown(&mgr->mm);
• spin_unlock(&mgr->lock);

• drm_buddy_fini(&mgr->mm);

• mutex_unlock(&mgr->lock);

  ttm_resource_manager_cleanup(man); ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, NULL);