[PATCH 2/2] Add drm buddy manager support to amdgpu driver
Arunpravin
Arunpravin.PaneerSelvam at amd.com
Mon Sep 20 19:21:10 UTC 2021
Replace drm_mm with drm buddy manager for
VRAM memory management
Signed-off-by: Arunpravin <Arunpravin.PaneerSelvam at amd.com>
---
.../gpu/drm/amd/amdgpu/amdgpu_res_cursor.h | 78 +++++--
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 216 ++++++++++--------
3 files changed, 189 insertions(+), 108 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
index acfa207cf970..ba24052e9062 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
@@ -30,12 +30,25 @@
#include <drm/ttm/ttm_resource.h>
#include <drm/ttm/ttm_range_manager.h>
+struct amdgpu_vram_mgr_node {
+ struct ttm_range_mgr_node tnode;
+ struct list_head blocks;
+};
+
+static inline struct amdgpu_vram_mgr_node *
+to_amdgpu_vram_mgr_node(struct ttm_resource *res)
+{
+ return container_of(container_of(res, struct ttm_range_mgr_node, base),
+ struct amdgpu_vram_mgr_node, tnode);
+}
+
/* 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;
};
/**
@@ -52,8 +65,6 @@ static inline void amdgpu_res_first(struct ttm_resource *res,
uint64_t start, uint64_t size,
struct amdgpu_res_cursor *cur)
{
- struct drm_mm_node *node;
-
if (!res || res->mem_type == TTM_PL_SYSTEM) {
cur->start = start;
cur->size = size;
@@ -65,14 +76,39 @@ static inline void amdgpu_res_first(struct ttm_resource *res,
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;
+
+ if (cur->mem_type == TTM_PL_VRAM) {
+ struct drm_buddy_block *block;
+ struct list_head *head, *next;
+
+ head = &to_amdgpu_vram_mgr_node(res)->blocks;
+
+ block = list_first_entry_or_null(head, struct drm_buddy_block, link);
+ while (start >= block->size << PAGE_SHIFT) {
+ start -= block->size << PAGE_SHIFT;
+
+ next = block->link.next;
+ if (next != head)
+ block = list_entry(next, struct drm_buddy_block, link);
+ }
- cur->start = (node->start << PAGE_SHIFT) + start;
- cur->size = min((node->size << PAGE_SHIFT) - start, size);
- cur->remaining = size;
- cur->node = node;
+ cur->start = (block->start << PAGE_SHIFT) + start;
+ cur->size = min((block->size << PAGE_SHIFT) - start, size);
+ cur->remaining = size;
+ cur->node = block;
+ } else if (cur->mem_type == TTM_PL_TT) {
+ struct drm_mm_node *node;
+
+ 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;
+ }
}
/**
@@ -85,8 +121,6 @@ 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;
-
BUG_ON(size > cur->remaining);
cur->remaining -= size;
@@ -99,9 +133,23 @@ 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);
+ if (cur->mem_type == TTM_PL_VRAM) {
+ struct drm_buddy_block *block = cur->node;
+ struct list_head *next;
+
+ next = block->link.next;
+ block = list_entry(next, struct drm_buddy_block, link);
+
+ cur->node = block;
+ cur->start = block->start << PAGE_SHIFT;
+ cur->size = min(block->size << PAGE_SHIFT, cur->remaining);
+ } else if (cur->mem_type == TTM_PL_TT) {
+ struct drm_mm_node *node = cur->node;
+
+ cur->node = ++node;
+ cur->start = node->start << PAGE_SHIFT;
+ cur->size = min(node->size << PAGE_SHIFT, cur->remaining);
+ }
}
#endif
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index e69f3e8e06e5..96c8e8aaa0ee 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)
@@ -40,7 +41,7 @@
struct amdgpu_vram_mgr {
struct ttm_resource_manager manager;
- struct drm_mm mm;
+ struct drm_buddy_mm mm;
spinlock_t lock;
struct list_head reservations_pending;
struct list_head reserved_pages;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index 7b2b0980ec41..de0c5f4cabaf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -23,7 +23,9 @@
*/
#include <linux/dma-mapping.h>
+#include <linux/list_sort.h>
#include <drm/ttm/ttm_range_manager.h>
+#include <drm/drm_buddy.h>
#include "amdgpu.h"
#include "amdgpu_vm.h"
@@ -33,7 +35,7 @@
struct amdgpu_vram_reservation {
struct list_head node;
- struct drm_mm_node mm_node;
+ struct drm_buddy_block mm_node;
};
static inline struct amdgpu_vram_mgr *
@@ -196,10 +198,10 @@ 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;
+ uint64_t start = block->start << PAGE_SHIFT;
+ uint64_t end = (block->size + block->start) << PAGE_SHIFT;
if (start >= adev->gmc.visible_vram_size)
return 0;
@@ -220,8 +222,8 @@ 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;
+ struct amdgpu_vram_mgr_node *vnode = to_amdgpu_vram_mgr_node(res);
+ struct drm_buddy_block *block;
u64 usage;
if (amdgpu_gmc_vram_full_visible(&adev->gmc))
@@ -230,9 +232,8 @@ 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, &vnode->blocks, link)
+ usage += amdgpu_vram_mgr_vis_size(adev, block);
return usage;
}
@@ -242,12 +243,15 @@ 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 *mm = &mgr->mm;
struct amdgpu_vram_reservation *rsv, *temp;
uint64_t vis_usage;
+ int r = 0;
list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, node) {
- if (drm_mm_reserve_node(mm, &rsv->mm_node))
+ r = drm_buddy_alloc_range(mm, &rsv->node, rsv->mm_node.start, rsv->mm_node.size);
+
+ if (unlikely(r))
continue;
dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
@@ -333,26 +337,16 @@ int amdgpu_vram_mgr_query_page_status(struct ttm_resource_manager *man,
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)
+static int sort_blocks(void *priv, const struct list_head *A,
+ const struct list_head *B)
{
- unsigned long start;
+ struct drm_buddy_block *a = list_entry(A, typeof(*a), link);
+ struct drm_buddy_block *b = list_entry(B, typeof(*b), link);
- start = node->start + node->size;
- if (start > mem->num_pages)
- start -= mem->num_pages;
+ if (a->start < b->start)
+ return -1;
else
- start = 0;
- mem->start = max(mem->start, start);
+ return 1;
}
/**
@@ -370,15 +364,20 @@ 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;
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 amdgpu_vram_mgr_node *vnode;
+ struct drm_buddy_mm *mm = &mgr->mm;
struct ttm_range_mgr_node *node;
- struct drm_mm *mm = &mgr->mm;
- enum drm_mm_insert_mode mode;
+ enum drm_buddy_alloc_mode mode;
+ struct drm_buddy_block *block;
+ unsigned int visible_pfn;
+ bool bar_limit_enabled;
+ unsigned long n_pages;
unsigned i;
- int r;
+ int r = 0;
lpfn = place->lpfn;
if (!lpfn)
@@ -395,10 +394,9 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
goto error_sub;
}
- if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
+ if (place->flags & TTM_PL_FLAG_CONTIGUOUS)
pages_per_node = ~0ul;
- num_nodes = 1;
- } else {
+ else {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
pages_per_node = HPAGE_PMD_NR;
#else
@@ -407,57 +405,97 @@ 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);
- if (!node) {
+ vnode = kzalloc(sizeof(*vnode), GFP_KERNEL);
+
+ if (!vnode) {
r = -ENOMEM;
goto error_sub;
}
+ node = &vnode->tnode;
+
ttm_resource_init(tbo, place, &node->base);
- mode = DRM_MM_INSERT_BEST;
- if (place->flags & TTM_PL_FLAG_TOPDOWN)
- mode = DRM_MM_INSERT_HIGH;
+ bar_limit_enabled = !(amdgpu_gmc_vram_full_visible(&adev->gmc));
+
+ visible_pfn = adev->gmc.visible_vram_size >> PAGE_SHIFT;
+
+ mode = DRM_BUDDY_BOTTOM_UP;
+ if (!place->fpfn && lpfn == man->size &&
+ (place->flags & TTM_PL_FLAG_TOPDOWN))
+ /* Allocate blocks from CPU non-mappable (TOP-DOWN) region */
+ mode = DRM_BUDDY_TOP_DOWN;
+ else if (place->fpfn || (lpfn != man->size && lpfn != visible_pfn))
+ /* Allocate blocks in desired range */
+ mode = DRM_BUDDY_ALLOC_RANGE;
pages_left = node->base.num_pages;
/* Limit maximum size to 2GB due to SG table limitations */
pages = min(pages_left, 2UL << (30 - PAGE_SHIFT));
+ INIT_LIST_HEAD(&vnode->blocks);
+
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;
- }
+ if (mode == DRM_BUDDY_ALLOC_RANGE) {
+ r = drm_buddy_alloc_range(mm, &vnode->blocks,
+ (uint64_t)place->fpfn << PAGE_SHIFT, pages << PAGE_SHIFT);
+
+ if (unlikely(r))
+ goto error_free_res;
+ } else {
+ while (pages_left) {
+ if (pages >= pages_per_node)
+ pages = pages_per_node;
+
+ n_pages = pages;
+
+ if (place->flags & TTM_PL_FLAG_CONTIGUOUS)
+ n_pages = roundup_pow_of_two(n_pages);
+
+ do {
+ unsigned int order;
+
+ order = fls(n_pages) - 1;
+ BUG_ON(order > mm->max_order);
+
+ spin_lock(&mgr->lock);
+ block = drm_buddy_alloc(mm, order, bar_limit_enabled,
+ visible_pfn, mode);
+ spin_unlock(&mgr->lock);
- 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;
+ if (IS_ERR(block)) {
+ r = -ENOSPC;
+ goto error_free_blocks;
+ }
- if (pages > pages_left)
- pages = pages_left;
+ n_pages -= BIT(order);
+
+ list_add_tail(&block->link, &vnode->blocks);
+
+ if (!n_pages)
+ break;
+ } while (1);
+
+ pages_left -= pages;
+ ++i;
+
+ if (pages > pages_left)
+ pages = pages_left;
+ }
}
+
+ spin_lock(&mgr->lock);
+ list_sort(NULL, &vnode->blocks, sort_blocks);
+
+ list_for_each_entry(block, &vnode->blocks, link)
+ vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
+
+ block = list_first_entry_or_null(&vnode->blocks,
+ struct drm_buddy_block, link);
+ node->base.start = block->start;
spin_unlock(&mgr->lock);
if (i == 1)
@@ -472,12 +510,12 @@ 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]);
+error_free_blocks:
+ spin_lock(&mgr->lock);
+ drm_buddy_free_list(mm, &vnode->blocks);
spin_unlock(&mgr->lock);
- kvfree(node);
-
+error_free_res:
+ kfree(vnode);
error_sub:
atomic64_sub(mem_bytes, &mgr->usage);
return r;
@@ -494,28 +532,28 @@ 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 *vnode = 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 *mm = &mgr->mm;
+ struct drm_buddy_block *block;
uint64_t usage = 0, 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];
-
- drm_mm_remove_node(mm);
- usage += mm->size << PAGE_SHIFT;
- vis_usage += amdgpu_vram_mgr_vis_size(adev, mm);
+ list_for_each_entry(block, &vnode->blocks, link) {
+ usage += block->size << PAGE_SHIFT;
+ vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
}
+
amdgpu_vram_mgr_do_reserve(man);
+
+ drm_buddy_free_list(mm, &vnode->blocks);
spin_unlock(&mgr->lock);
atomic64_sub(usage, &mgr->usage);
atomic64_sub(vis_usage, &mgr->vis_usage);
- kvfree(node);
+ kfree(vnode);
}
/**
@@ -668,12 +706,6 @@ uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_resource_manager *man)
static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
struct drm_printer *printer)
{
- struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
-
- spin_lock(&mgr->lock);
- drm_mm_print(&mgr->mm, printer);
- spin_unlock(&mgr->lock);
-
drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
man->size, amdgpu_vram_mgr_usage(man) >> 20,
amdgpu_vram_mgr_vis_usage(man) >> 20);
@@ -701,7 +733,7 @@ int amdgpu_vram_mgr_init(struct amdgpu_device *adev)
man->func = &amdgpu_vram_mgr_func;
- drm_mm_init(&mgr->mm, 0, man->size);
+ drm_buddy_init(&mgr->mm, man->size << PAGE_SHIFT, PAGE_SIZE);
spin_lock_init(&mgr->lock);
INIT_LIST_HEAD(&mgr->reservations_pending);
INIT_LIST_HEAD(&mgr->reserved_pages);
@@ -737,10 +769,10 @@ void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
kfree(rsv);
list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, node) {
- drm_mm_remove_node(&rsv->mm_node);
+ drm_buddy_free(&mgr->mm, &rsv->mm_node);
kfree(rsv);
}
- drm_mm_takedown(&mgr->mm);
+ drm_buddy_fini(&mgr->mm);
spin_unlock(&mgr->lock);
ttm_resource_manager_cleanup(man);
--
2.25.1
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