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

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On 22/02/22 6:24 pm, Christian König wrote:
> 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@xxxxxxxxx>
>>
>> v5:
>>    - fix merge conflict issue
>>
>> v6:
>>    - fix warnings reported by kernel test robot <lkp@xxxxxxxxx>
>>
>> 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@xxxxxxx>
>> ---
>>   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!
> 
Hi Christian,
please review the new patch which has the following changes

* Each node maximum size is 2GiB

* Alignment design
how min_page_size is determined? min_page_size is the argument passed to
drm_buddy, If we dont find a node equivalent to min_page_size, drm_buddy
returns -ENOSPC

First we determine pages_per_node, it is the alignment size within the
required total size, If huge page enabled pages_per_node = HPAGE_PMD_NR;
Else, pages_per_node = 2MB, finally we take pages_per_node = max of
(pages_per_node, tbo->page_alignment)

case 1 : If required pages > pages_per_node, then min_page_size =
pages_per_node

case 2 : If required pages < pages_per_node, then min_page_size =
tbo->page_alignment if available , else defaults to 4KB

case 3: If CONTIGUOUS flag enabled, min_page_size = size;

pages_per_node is the alignment size within the required total size
min_page_size is the argument passed to drm_buddy
If we dont find a node equivalent to min_page_size, drm_buddy returns
-ENOSPC

* when required size is > 2GB
say for example required size = 3GB, since the max node size is 2GB, we
don't get continuous 3GB of allocation if required, we get 2GB
contiguous and 1GB contiguous

Thanks,
Arun
>> +
>> +		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);
> 



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