Am 23.03.22 um 07:25 schrieb Arunpravin Paneer Selvam:
[SNIP]
@@ -415,48 +409,86 @@ 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;
- pages_left = node->base.num_pages;
+ if (place->fpfn || lpfn != man->size >> PAGE_SHIFT)
+ /* Allocate blocks in desired range */
+ node->flags |= DRM_BUDDY_RANGE_ALLOCATION;
- /* Limit maximum size to 2GB due to SG table limitations */
- pages = min(pages_left, 2UL << (30 - PAGE_SHIFT));
+ BUG_ON(!node->base.num_pages);
Please drop this BUG_ON(). This is not something which prevents further
data corruption, so the BUG_ON() is not justified.
+ pages_left = node->base.num_pages;
i = 0;
- spin_lock(&mgr->lock);
while (pages_left) {
- uint32_t alignment = tbo->page_alignment;
+ if (tbo->page_alignment)
+ min_page_size = tbo->page_alignment << PAGE_SHIFT;
+ else
+ min_page_size = mgr->default_page_size;
The handling here looks extremely awkward to me.
min_page_size should be determined outside of the loop, based on
default_page_size, alignment and contiguous flag.
Then why do you drop the lock and grab it again inside the loop? And
what is "i" actually good for?
+
+ /* Limit maximum size to 2GB due to SG table limitations */
+ pages = min(pages_left, 2UL << (30 - PAGE_SHIFT));
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;
+ min_page_size = pages_per_node << PAGE_SHIFT;
+
+ if (!is_contiguous && !IS_ALIGNED(pages, min_page_size >> PAGE_SHIFT))
+ is_contiguous = 1;
+
+ if (is_contiguous) {
+ pages = roundup_pow_of_two(pages);
+ min_page_size = pages << PAGE_SHIFT;
+
+ if (pages > lpfn)
+ lpfn = pages;
}
- 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;
+ BUG_ON(min_page_size < mm->chunk_size);
+
+ mutex_lock(&mgr->lock);
+ r = drm_buddy_alloc_blocks(mm, (u64)place->fpfn << PAGE_SHIFT,
+ (u64)lpfn << PAGE_SHIFT,
+ (u64)pages << PAGE_SHIFT,
+ min_page_size,
+ &node->blocks,
+ node->flags);
+ mutex_unlock(&mgr->lock);
+ if (unlikely(r))
+ goto error_free_blocks;
+
++i;
if (pages > pages_left)
- pages = pages_left;
+ pages_left = 0;
+ else
+ pages_left -= pages;
}
- spin_unlock(&mgr->lock);
- if (i == 1)
+ /* Free unused pages for contiguous allocation */
+ if (is_contiguous) {
Well that looks really odd, why is trimming not part of
drm_buddy_alloc_blocks() ?
+ u64 actual_size = (u64)node->base.num_pages << PAGE_SHIFT;
+
+ mutex_lock(&mgr->lock);
+ drm_buddy_block_trim(mm,
+ actual_size,
+ &node->blocks);
Why is the drm_buddy_block_trim() function given all the blocks and not
just the last one?
Regards,
Christian.
+ mutex_unlock(&mgr->lock);
+ }
+
+ list_for_each_entry(block, &node->blocks, link)
+ vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
+
+ block = amdgpu_vram_mgr_first_block(&node->blocks);
+ if (!block) {
+ r = -EINVAL;
+ goto error_fini;
+ }
+
+ node->base.start = amdgpu_node_start(block) >> PAGE_SHIFT;
+
+ if (i == 1 && is_contiguous)
node->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
if (adev->gmc.xgmi.connected_to_cpu)
@@ -468,13 +500,13 @@ 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 +522,26 @@ 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 +679,22 @@ 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 +714,21 @@ 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 +756,16 @@ 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);
base-commit: a678f97326454b60ffbbde6abf52d23997d71a27
