Linaro-mm-sig

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[PATCH] mm/vmalloc: map contiguous pages in batches for vmap() whenever possible

by Barry Song

From: Barry Song <v-songbaohua(a)oppo.com> In many cases, the pages passed to vmap() may include high-order pages allocated with __GFP_COMP flags. For example, the systemheap often allocates pages in descending order: order 8, then 4, then 0. Currently, vmap() iterates over every page individually—even pages inside a high-order block are handled one by one. This patch detects high-order pages and maps them as a single contiguous block whenever possible. An alternative would be to implement a new API, vmap_sg(), but that change seems to be large in scope. When vmapping a 128MB dma-buf using the systemheap, this patch makes system_heap_do_vmap() roughly 17× faster. W/ patch: [ 10.404769] system_heap_do_vmap took 2494000 ns [ 12.525921] system_heap_do_vmap took 2467008 ns [ 14.517348] system_heap_do_vmap took 2471008 ns [ 16.593406] system_heap_do_vmap took 2444000 ns [ 19.501341] system_heap_do_vmap took 2489008 ns W/o patch: [ 7.413756] system_heap_do_vmap took 42626000 ns [ 9.425610] system_heap_do_vmap took 42500992 ns [ 11.810898] system_heap_do_vmap took 42215008 ns [ 14.336790] system_heap_do_vmap took 42134992 ns [ 16.373890] system_heap_do_vmap took 42750000 ns Cc: David Hildenbrand <david(a)kernel.org> Cc: Uladzislau Rezki <urezki(a)gmail.com> Cc: Sumit Semwal <sumit.semwal(a)linaro.org> Cc: John Stultz <jstultz(a)google.com> Cc: Maxime Ripard <mripard(a)kernel.org> Tested-by: Tangquan Zheng <zhengtangquan(a)oppo.com> Signed-off-by: Barry Song <v-songbaohua(a)oppo.com> --- * diff with rfc: Many code refinements based on David's suggestions, thanks! Refine comment and changelog according to Uladzislau, thanks! rfc link: https://lore.kernel.org/linux-mm/20251122090343.81243-1-21cnbao@gmail.com/ mm/vmalloc.c | 45 +++++++++++++++++++++++++++++++++++++++------ 1 file changed, 39 insertions(+), 6 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 41dd01e8430c..8d577767a9e5 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -642,6 +642,29 @@ static int vmap_small_pages_range_noflush(unsigned long addr, unsigned long end, return err; } +static inline int get_vmap_batch_order(struct page **pages, + unsigned int stride, unsigned int max_steps, unsigned int idx) +{ + int nr_pages = 1; + + /* + * Currently, batching is only supported in vmap_pages_range + * when page_shift == PAGE_SHIFT. + */ + if (stride != 1) + return 0; + + nr_pages = compound_nr(pages[idx]); + if (nr_pages == 1) + return 0; + if (max_steps < nr_pages) + return 0; + + if (num_pages_contiguous(&pages[idx], nr_pages) == nr_pages) + return compound_order(pages[idx]); + return 0; +} + /* * vmap_pages_range_noflush is similar to vmap_pages_range, but does not * flush caches. @@ -655,23 +678,33 @@ int __vmap_pages_range_noflush(unsigned long addr, unsigned long end, pgprot_t prot, struct page **pages, unsigned int page_shift) { unsigned int i, nr = (end - addr) >> PAGE_SHIFT; + unsigned int stride; WARN_ON(page_shift < PAGE_SHIFT); + /* + * For vmap(), users may allocate pages from high orders down to + * order 0, while always using PAGE_SHIFT as the page_shift. + * We first check whether the initial page is a compound page. If so, + * there may be an opportunity to batch multiple pages together. + */ if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMALLOC) || - page_shift == PAGE_SHIFT) + (page_shift == PAGE_SHIFT && !PageCompound(pages[0]))) return vmap_small_pages_range_noflush(addr, end, prot, pages); - for (i = 0; i < nr; i += 1U << (page_shift - PAGE_SHIFT)) { - int err; + stride = 1U << (page_shift - PAGE_SHIFT); + for (i = 0; i < nr; ) { + int err, order; - err = vmap_range_noflush(addr, addr + (1UL << page_shift), + order = get_vmap_batch_order(pages, stride, nr - i, i); + err = vmap_range_noflush(addr, addr + (1UL << (page_shift + order)), page_to_phys(pages[i]), prot, - page_shift); + page_shift + order); if (err) return err; - addr += 1UL << page_shift; + addr += 1UL << (page_shift + order); + i += 1U << (order + page_shift - PAGE_SHIFT); } return 0; -- 2.39.3 (Apple Git-146)

4 weeks, 1 day

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1 month

[PATCH] dma-fence: Clarify external lock use case in dma_fence_init() docs

by Maíra Canal

The kerneldoc comment on dma_fence_init() and dma_fence_init64() describe the legacy reason to pass an external lock as a need to prevent multiple fences "from signaling out of order". However, this wording is a bit misleading: a shared spinlock does not (and cannot) prevent the signaler from signaling out of order. Signaling order is the driver's responsibility regardless of whether the lock is shared or per-fence. What a shared lock actually provides is serialization of signaling and observation across fences in a given context, so that observers never see a later fence signaled while an earlier one is not. Reword both comments to describe this more accurately. Signed-off-by: Maíra Canal <mcanal(a)igalia.com> --- Hi, While reading the documentation, I found this particular paragraph quite hard to understand. As I understand it, locks don't enforce order, only serialization, but the paragraph seems to communicate the other way around. Due to that, I had the impression that the current wording can be misleading for driver developers. I'm proposing a new wording to better describe the use case of the external lock based on my understanding, but it would be great to hear the feedback and suggestions from more experienced developers who might have more insight about these legacy use cases. Best regards, - Maíra drivers/dma-buf/dma-fence.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 1826ba73094c..bdc29d1c1b5c 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -1102,8 +1102,10 @@ __dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops, * to check which fence is later by simply using dma_fence_later(). * * It is strongly discouraged to provide an external lock because this couples - * lock and fence life time. This is only allowed for legacy use cases when - * multiple fences need to be prevented from signaling out of order. + * lock and fence lifetime. This is only allowed for legacy use cases that need + * a shared lock to serialize signaling and observation of fences within a + * context, so that observers never see a later fence signaled while an earlier + * one isn't. */ void dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops, @@ -1129,8 +1131,10 @@ EXPORT_SYMBOL(dma_fence_init); * to check which fence is later by simply using dma_fence_later(). * * It is strongly discouraged to provide an external lock because this couples - * lock and fence life time. This is only allowed for legacy use cases when - * multiple fences need to be prevented from signaling out of order. + * lock and fence lifetime. This is only allowed for legacy use cases that need + * a shared lock to serialize signaling and observation of fences within a + * context, so that observers never see a later fence signaled while an earlier + * one isn't. */ void dma_fence_init64(struct dma_fence *fence, const struct dma_fence_ops *ops, -- 2.53.0

1 month

[PATCH] dma-buf: fix order of trace and fput

by Christian König

Dropping the last reference to the DMA-buf and then accessing the name for tracing can't work correctly. Only compile tested! Signed-off-by: Christian König <christian.koenig(a)amd.com> Fixed: 281a22631423 ("dma-buf: add some tracepoints to debug.") --- drivers/dma-buf/dma-buf.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 11711874a325..3a9d5113b98c 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -845,9 +845,8 @@ void dma_buf_put(struct dma_buf *dmabuf) if (WARN_ON(!dmabuf || !dmabuf->file)) return; - fput(dmabuf->file); - DMA_BUF_TRACE(trace_dma_buf_put, dmabuf); + fput(dmabuf->file); } EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF"); -- 2.43.0

1 month

[PATCH 1/3] dma-fence: Silce sparse warning in dma_fence_describe

by Tvrtko Ursulin

Sparse complains about assigning a string to a __rcu annotated local variable: drivers/dma-buf/dma-fence.c:1040:38: warning: incorrect type in initializer (different address spaces) drivers/dma-buf/dma-fence.c:1040:38: expected char const [noderef] __rcu *timeline drivers/dma-buf/dma-fence.c:1040:38: got char * drivers/dma-buf/dma-fence.c:1041:36: warning: incorrect type in initializer (different address spaces) drivers/dma-buf/dma-fence.c:1041:36: expected char const [noderef] __rcu *driver drivers/dma-buf/dma-fence.c:1041:36: got char * It is harmless but lets silence it. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: ac364014fd81 ("dma-buf: cleanup dma_fence_describe v3") Cc: Christian König <christian.koenig(a)amd.com> Cc: linux-media(a)vger.kernel.org Cc: dri-devel(a)lists.freedesktop.org Cc: linaro-mm-sig(a)lists.linaro.org --- drivers/dma-buf/dma-fence.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 1826ba73094c..a2aa82f4eedd 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -1037,8 +1037,8 @@ EXPORT_SYMBOL(dma_fence_set_deadline); */ void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq) { - const char __rcu *timeline = ""; - const char __rcu *driver = ""; + const char __rcu *timeline = (const char __rcu *)""; + const char __rcu *driver = (const char __rcu *)""; const char *signaled = ""; rcu_read_lock(); -- 2.52.0

1 month

[PATCH] dma-buf: set SB_I_NOEXEC and SB_I_NODEV on dmabuf filesystem

by Chia-Lin Kao (AceLan)

The VFS now warns if an inode flagged with S_ANON_INODE is located on a filesystem that does not have SB_I_NOEXEC set. dmabuf inodes are created using alloc_anon_inode(), which sets S_ANON_INODE. This triggers a warning in path_noexec() when a dmabuf is mmapped, for example by GStreamer's v4l2src element. [ 60.061328] WARNING: CPU: 2 PID: 2803 at fs/exec.c:125 path_noexec+0xa0/0xd0 ... [ 60.061637] do_mmap+0x2b5/0x680 The warning was introduced by commit 1e7ab6f67824 ("anon_inode: rework assertions") which added enforcement that anonymous inodes must be on filesystems with SB_I_NOEXEC set. Fix this by setting SB_I_NOEXEC and SB_I_NODEV on the dmabuf filesystem context, following the same pattern as commit ce7419b6cf23d ("anon_inode: raise SB_I_NODEV and SB_I_NOEXEC") and commit 98f99394a104c ("secretmem: use SB_I_NOEXEC"). Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao(a)canonical.com> --- drivers/dma-buf/dma-buf.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index a4d8f2ff94e46..dea79aaab10ce 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -221,6 +221,8 @@ static int dma_buf_fs_init_context(struct fs_context *fc) if (!ctx) return -ENOMEM; ctx->dops = &dma_buf_dentry_ops; + fc->s_iflags |= SB_I_NOEXEC; + fc->s_iflags |= SB_I_NODEV; return 0; } -- 2.51.0

1 month

[PATCH] dma-fence: Move signalling tracepoint to before ops detach

by Tvrtko Ursulin

Move the signalling tracepoint to before fence->ops are reset otherwise tracepoint will dereference a null pointer. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: 541c8f2468b9 ("dma-buf: detach fence ops on signal v3") Cc: Christian König <christian.koenig(a)amd.com> Cc: Philipp Stanner <phasta(a)kernel.org> Cc: Boris Brezillon <boris.brezillon(a)collabora.com> Cc: linux-media(a)vger.kernel.org Cc: linaro-mm-sig(a)lists.linaro.org --- drivers/dma-buf/dma-fence.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 1826ba73094c..1c1eaecaf1b0 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -363,6 +363,8 @@ void dma_fence_signal_timestamp_locked(struct dma_fence *fence, &fence->flags))) return; + trace_dma_fence_signaled(fence); + /* * When neither a release nor a wait operation is specified set the ops * pointer to NULL to allow the fence structure to become independent @@ -377,7 +379,6 @@ void dma_fence_signal_timestamp_locked(struct dma_fence *fence, fence->timestamp = timestamp; set_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags); - trace_dma_fence_signaled(fence); list_for_each_entry_safe(cur, tmp, &cb_list, node) { INIT_LIST_HEAD(&cur->node); -- 2.52.0

1 month

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1 month

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by Alex Morgan

1 month

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