From: "Paneer Selvam, Arunpravin" <Arunpravin.PaneerSelvam@amd.com>
To: Matthew Auld <matthew.auld@intel.com>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"intel-gfx@lists.freedesktop.org"
<intel-gfx@lists.freedesktop.org>,
"amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>
Cc: "Paneer Selvam, Arunpravin" <Arunpravin.PaneerSelvam@amd.com>,
"tzimmermann@suse.de" <tzimmermann@suse.de>,
"Deucher, Alexander" <Alexander.Deucher@amd.com>,
"Koenig, Christian" <Christian.Koenig@amd.com>
Subject: RE: [PATCH v4 4/6] drm: implement a method to free unused pages
Date: Thu, 9 Dec 2021 15:52:16 +0000 [thread overview]
Message-ID: <MN2PR12MB4342E888EDC333C3089834FBE4709@MN2PR12MB4342.namprd12.prod.outlook.com> (raw)
In-Reply-To: <20211201163938.133226-4-Arunpravin.PaneerSelvam@amd.com>
[Public]
Hi Matthew,
Ping?
Regards,
Arun
-----Original Message-----
From: Paneer Selvam, Arunpravin <Arunpravin.PaneerSelvam@amd.com>
Sent: Wednesday, December 1, 2021 10:10 PM
To: dri-devel@lists.freedesktop.org; intel-gfx@lists.freedesktop.org; amd-gfx@lists.freedesktop.org
Cc: matthew.auld@intel.com; daniel@ffwll.ch; Koenig, Christian <Christian.Koenig@amd.com>; Deucher, Alexander <Alexander.Deucher@amd.com>; tzimmermann@suse.de; jani.nikula@linux.intel.com; Paneer Selvam, Arunpravin <Arunpravin.PaneerSelvam@amd.com>
Subject: [PATCH v4 4/6] drm: implement a method to free unused pages
On contiguous allocation, we round up the size to the *next* power of 2, implement a function to free the unused pages after the newly allocate block.
v2(Matthew Auld):
- replace function name 'drm_buddy_free_unused_pages' with
drm_buddy_block_trim
- replace input argument name 'actual_size' with 'new_size'
- add more validation checks for input arguments
- add overlaps check to avoid needless searching and splitting
- merged the below patch to see the feature in action
- add free unused pages support to i915 driver
- lock drm_buddy_block_trim() function as it calls mark_free/mark_split
are all globally visible
v3:
- remove drm_buddy_block_trim() error handling and
print a warn message if it fails
Signed-off-by: Arunpravin <Arunpravin.PaneerSelvam@amd.com>
---
drivers/gpu/drm/drm_buddy.c | 72 ++++++++++++++++++-
drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 10 +++
include/drm/drm_buddy.h | 4 ++
3 files changed, 83 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index eddc1eeda02e..707efc82216d 100644
--- a/drivers/gpu/drm/drm_buddy.c
+++ b/drivers/gpu/drm/drm_buddy.c
@@ -434,7 +434,8 @@ alloc_from_freelist(struct drm_buddy_mm *mm, static int __alloc_range(struct drm_buddy_mm *mm,
struct list_head *dfs,
u64 start, u64 size,
- struct list_head *blocks)
+ struct list_head *blocks,
+ bool trim_path)
{
struct drm_buddy_block *block;
struct drm_buddy_block *buddy;
@@ -480,8 +481,20 @@ static int __alloc_range(struct drm_buddy_mm *mm,
if (!drm_buddy_block_is_split(block)) {
err = split_block(mm, block);
- if (unlikely(err))
+ if (unlikely(err)) {
+ if (trim_path)
+ /*
+ * Here in case of trim, we return and dont goto
+ * split failure path as it removes from the
+ * original list and potentially also freeing
+ * the block. so we could leave as it is,
+ * worse case we get some internal fragmentation
+ * and leave the decision to the user
+ */
+ return err;
+
goto err_undo;
+ }
}
list_add(&block->right->tmp_link, dfs); @@ -535,8 +548,61 @@ static int __drm_buddy_alloc_range(struct drm_buddy_mm *mm,
for (i = 0; i < mm->n_roots; ++i)
list_add_tail(&mm->roots[i]->tmp_link, &dfs);
- return __alloc_range(mm, &dfs, start, size, blocks);
+ return __alloc_range(mm, &dfs, start, size, blocks, 0); }
+
+/**
+ * drm_buddy_block_trim - free unused pages
+ *
+ * @mm: DRM buddy manager
+ * @new_size: original size requested
+ * @blocks: output list head to add allocated blocks
+ *
+ * For contiguous allocation, we round up the size to the nearest
+ * power of two value, drivers consume *actual* size, so remaining
+ * portions are unused and it can be freed.
+ *
+ * Returns:
+ * 0 on success, error code on failure.
+ */
+int drm_buddy_block_trim(struct drm_buddy_mm *mm,
+ u64 new_size,
+ struct list_head *blocks)
+{
+ struct drm_buddy_block *block;
+ u64 new_start;
+ LIST_HEAD(dfs);
+
+ if (!list_is_singular(blocks))
+ return -EINVAL;
+
+ block = list_first_entry(blocks,
+ struct drm_buddy_block,
+ link);
+
+ if (!drm_buddy_block_is_allocated(block))
+ return -EINVAL;
+
+ if (new_size > drm_buddy_block_size(mm, block))
+ return -EINVAL;
+
+ if (!new_size && !IS_ALIGNED(new_size, mm->chunk_size))
+ return -EINVAL;
+
+ if (new_size == drm_buddy_block_size(mm, block))
+ return 0;
+
+ list_del(&block->link);
+
+ new_start = drm_buddy_block_offset(block);
+
+ mark_free(mm, block);
+
+ list_add(&block->tmp_link, &dfs);
+
+ return __alloc_range(mm, &dfs, new_start, new_size, blocks, 1);
}
+EXPORT_SYMBOL(drm_buddy_block_trim);
/**
* drm_buddy_alloc - allocate power-of-two blocks diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
index 7c58efb60dba..c5831c27fe82 100644
--- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
+++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
@@ -97,6 +97,16 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
if (unlikely(err))
goto err_free_blocks;
+ if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
+ mutex_lock(&bman->lock);
+ err = drm_buddy_block_trim(mm,
+ (u64)n_pages << PAGE_SHIFT,
+ &bman_res->blocks);
+ mutex_unlock(&bman->lock);
+ pr_warn("drm_buddy_block_trim failed returing %d for ttm_buffer_object(%p)\n",
+ err, bo);
+ }
+
*res = &bman_res->base;
return 0;
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h index 316ac0d25f08..90906d9dbbf0 100644
--- a/include/drm/drm_buddy.h
+++ b/include/drm/drm_buddy.h
@@ -146,6 +146,10 @@ int drm_buddy_alloc(struct drm_buddy_mm *mm,
struct list_head *blocks,
unsigned long flags);
+int drm_buddy_block_trim(struct drm_buddy_mm *mm,
+ u64 new_size,
+ struct list_head *blocks);
+
void drm_buddy_free(struct drm_buddy_mm *mm, struct drm_buddy_block *block);
void drm_buddy_free_list(struct drm_buddy_mm *mm, struct list_head *objects);
--
2.25.1
next prev parent reply other threads:[~2021-12-09 17:03 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-01 16:39 [PATCH v4 1/6] drm: move the buddy allocator from i915 into common drm Arunpravin
2021-12-01 16:39 ` [PATCH v4 2/6] drm: improve drm_buddy_alloc function Arunpravin
2021-12-09 15:47 ` Paneer Selvam, Arunpravin
2021-12-13 18:59 ` Matthew Auld
2021-12-15 20:46 ` Arunpravin
2021-12-16 10:55 ` Matthew Auld
2021-12-16 11:35 ` Thomas Zimmermann
2021-12-26 20:59 ` Arunpravin
2022-01-03 7:41 ` Christian König
2022-01-06 12:01 ` Thomas Zimmermann
2021-12-01 16:39 ` [PATCH v4 3/6] drm: implement top-down allocation method Arunpravin
2021-12-01 16:39 ` [PATCH v4 4/6] drm: implement a method to free unused pages Arunpravin
2021-12-09 15:52 ` Paneer Selvam, Arunpravin [this message]
2021-12-13 18:40 ` Matthew Auld
2021-12-15 20:56 ` Arunpravin
2021-12-01 16:39 ` [PATCH v4 5/6] drm/amdgpu: move vram inline functions into a header Arunpravin
2021-12-01 16:39 ` [PATCH v4 6/6] drm/amdgpu: add drm buddy support to amdgpu Arunpravin
2021-12-02 0:56 ` [PATCH v4 1/6] drm: move the buddy allocator from i915 into common drm kernel test robot
2021-12-02 4:49 ` kernel test robot
2021-12-02 8:03 ` Christian König
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=MN2PR12MB4342E888EDC333C3089834FBE4709@MN2PR12MB4342.namprd12.prod.outlook.com \
--to=arunpravin.paneerselvam@amd.com \
--cc=Alexander.Deucher@amd.com \
--cc=Christian.Koenig@amd.com \
--cc=amd-gfx@lists.freedesktop.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=intel-gfx@lists.freedesktop.org \
--cc=matthew.auld@intel.com \
--cc=tzimmermann@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).