Linaro-mm-sig March 2026

linaro-mm-sig@lists.linaro.org

133 participants
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2 months, 2 weeks

[PATCH] udmabuf: Do not create malformed scatterlists

by Jason Gunthorpe

Using a sg_set_folio() loop for every 4K results in a malformed scatterlist because sg_set_folio() has an issue with offsets > PAGE_SIZE and because scatterlist expects the creator to build a list which consolidates any physical contiguity. sg_alloc_table_from_pages() creates a valid scatterlist directly from a struct page array, so go back to that. Remove the offsets allocation and just store an array of tail pages as it did before the below commit. Everything wants that anyhow. Fixes: 0c8b91ef5100 ("udmabuf: add back support for mapping hugetlb pages") Reported-by: Julian Orth <ju.orth(a)gmail.com> Closes: https://lore.kernel.org/all/20260308-scatterlist-v1-1-39c4566b0bba@gmail.co… Signed-off-by: Jason Gunthorpe <jgg(a)nvidia.com> --- drivers/dma-buf/udmabuf.c | 49 +++++++++++---------------------------- 1 file changed, 13 insertions(+), 36 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index 94b8ecb892bb17..5d687860445137 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -26,10 +26,10 @@ MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is struct udmabuf { pgoff_t pagecount; - struct folio **folios; + struct page **pages; /** - * Unlike folios, pinned_folios is only used for unpin. + * Unlike pages, pinned_folios is only used for unpin. * So, nr_pinned is not the same to pagecount, the pinned_folios * only set each folio which already pinned when udmabuf_create. * Note that, since a folio may be pinned multiple times, each folio @@ -41,7 +41,6 @@ struct udmabuf { struct sg_table *sg; struct miscdevice *device; - pgoff_t *offsets; }; static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) @@ -55,8 +54,7 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) if (pgoff >= ubuf->pagecount) return VM_FAULT_SIGBUS; - pfn = folio_pfn(ubuf->folios[pgoff]); - pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; + pfn = page_to_pfn(ubuf->pages[pgoff]); ret = vmf_insert_pfn(vma, vmf->address, pfn); if (ret & VM_FAULT_ERROR) @@ -73,8 +71,7 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) if (WARN_ON(pgoff >= ubuf->pagecount)) break; - pfn = folio_pfn(ubuf->folios[pgoff]); - pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; + pfn = page_to_pfn(ubuf->pages[pgoff]); /** * If the below vmf_insert_pfn() fails, we do not return an @@ -109,22 +106,11 @@ static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma) static int vmap_udmabuf(struct dma_buf *buf, struct iosys_map *map) { struct udmabuf *ubuf = buf->priv; - struct page **pages; void *vaddr; - pgoff_t pg; dma_resv_assert_held(buf->resv); - pages = kvmalloc_objs(*pages, ubuf->pagecount); - if (!pages) - return -ENOMEM; - - for (pg = 0; pg < ubuf->pagecount; pg++) - pages[pg] = folio_page(ubuf->folios[pg], - ubuf->offsets[pg] >> PAGE_SHIFT); - - vaddr = vm_map_ram(pages, ubuf->pagecount, -1); - kvfree(pages); + vaddr = vm_map_ram(ubuf->pages, ubuf->pagecount, -1); if (!vaddr) return -EINVAL; @@ -146,22 +132,18 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, { struct udmabuf *ubuf = buf->priv; struct sg_table *sg; - struct scatterlist *sgl; - unsigned int i = 0; int ret; sg = kzalloc_obj(*sg); if (!sg) return ERR_PTR(-ENOMEM); - ret = sg_alloc_table(sg, ubuf->pagecount, GFP_KERNEL); + ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->pagecount, 0, + ubuf->pagecount << PAGE_SHIFT, + GFP_KERNEL); if (ret < 0) goto err_alloc; - for_each_sg(sg->sgl, sgl, ubuf->pagecount, i) - sg_set_folio(sgl, ubuf->folios[i], PAGE_SIZE, - ubuf->offsets[i]); - ret = dma_map_sgtable(dev, sg, direction, 0); if (ret < 0) goto err_map; @@ -207,12 +189,8 @@ static void unpin_all_folios(struct udmabuf *ubuf) static __always_inline int init_udmabuf(struct udmabuf *ubuf, pgoff_t pgcnt) { - ubuf->folios = kvmalloc_objs(*ubuf->folios, pgcnt); - if (!ubuf->folios) - return -ENOMEM; - - ubuf->offsets = kvzalloc_objs(*ubuf->offsets, pgcnt); - if (!ubuf->offsets) + ubuf->pages = kvmalloc_objs(*ubuf->pages, pgcnt); + if (!ubuf->pages) return -ENOMEM; ubuf->pinned_folios = kvmalloc_objs(*ubuf->pinned_folios, pgcnt); @@ -225,8 +203,7 @@ static __always_inline int init_udmabuf(struct udmabuf *ubuf, pgoff_t pgcnt) static __always_inline void deinit_udmabuf(struct udmabuf *ubuf) { unpin_all_folios(ubuf); - kvfree(ubuf->offsets); - kvfree(ubuf->folios); + kvfree(ubuf->pages); } static void release_udmabuf(struct dma_buf *buf) @@ -344,8 +321,8 @@ static long udmabuf_pin_folios(struct udmabuf *ubuf, struct file *memfd, ubuf->pinned_folios[nr_pinned++] = folios[cur_folio]; for (; subpgoff < fsize; subpgoff += PAGE_SIZE) { - ubuf->folios[upgcnt] = folios[cur_folio]; - ubuf->offsets[upgcnt] = subpgoff; + ubuf->pages[upgcnt] = folio_page(folios[cur_folio], + subpgoff >> PAGE_SHIFT); ++upgcnt; if (++cur_pgcnt >= pgcnt) base-commit: 1f318b96cc84d7c2ab792fcc0bfd42a7ca890681 -- 2.43.0

2 months, 2 weeks

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2 months, 2 weeks

[PATCH v8 0/7] Rust bindings for gem shmem + iosys_map

by Lyude Paul

This is the next version of the shmem backed GEM objects series originally from Asahi, previously posted by Daniel Almeida. One of the major changes in this patch series is a much better interface around vmaps, which we achieve by introducing a new set of rust bindings for iosys_map. The previous version of the patch series can be found here: https://patchwork.freedesktop.org/series/156093/ This patch series may be applied on top of the driver-core/driver-core-testing branch: https://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core.git… Changelogs are per-patch Asahi Lina (2): rust: helpers: Add bindings/wrappers for dma_resv_lock rust: drm: gem: shmem: Add DRM shmem helper abstraction Lyude Paul (5): rust: drm: Add gem::impl_aref_for_gem_obj! rust: drm: gem: Add raw_dma_resv() function rust: gem: Introduce DriverObject::Args rust: drm: gem: Introduce shmem::SGTable rust: drm/gem: Add vmap functions to shmem bindings drivers/gpu/drm/nova/gem.rs | 5 +- drivers/gpu/drm/tyr/gem.rs | 3 +- rust/bindings/bindings_helper.h | 3 + rust/helpers/dma-resv.c | 13 + rust/helpers/drm.c | 56 +++- rust/helpers/helpers.c | 1 + rust/kernel/drm/gem/mod.rs | 79 +++-- rust/kernel/drm/gem/shmem.rs | 529 ++++++++++++++++++++++++++++++++ 8 files changed, 667 insertions(+), 22 deletions(-) create mode 100644 rust/helpers/dma-resv.c create mode 100644 rust/kernel/drm/gem/shmem.rs -- 2.53.0

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2 months, 3 weeks

Re: [PATCH] lib/scatterlist: fix sg_page_count and sg_dma_page_count

by Julian Orth

On Sun, Mar 8, 2026 at 7:08 PM Jason Gunthorpe <jgg(a)ziepe.ca> wrote: > > On Sun, Mar 08, 2026 at 02:55:27PM +0100, Julian Orth wrote: > > A user reported memory corruption in the Jay wayland compositor [1]. The > > corruption started when archlinux enabled > > CONFIG_TRANSPARENT_HUGEPAGE_SHMEM_HUGE_WITHIN_SIZE in kernel 6.19.5. > > > > The compositor uses udmabuf to upload memory from memfds to the GPU. > > When running an affected kernel, the following warnings are logged: > > > > a - addrs >= max_entries > > WARNING: drivers/gpu/drm/drm_prime.c:1089 at drm_prime_sg_to_dma_addr_array+0x86/0xc0, CPU#31: jay/1864 > > [...] > > Call Trace: > > <TASK> > > amdgpu_bo_move+0x188/0x800 [amdgpu 3b451640234948027c09e9b39e6520bc7e5471cf] > > > > Disabling the use of huge pages at runtime via > > /sys/kernel/mm/transparent_hugepage/shmem_enabled fixes the issue. > > > > udmabuf allocates a scatterlist with buffer_size/PAGE_SIZE entries. Each > > entry has a length of PAGE_SIZE. With huge pages disabled, it appears > > that sg->offset is always 0. With huge pages enabled, sg->offset is > > incremented by PAGE_SIZE until the end of the huge page. > > This was broken by 0c8b91ef5100 ("udmabuf: add back support for > mapping hugetlb pages") which switched from a working > sg_alloc_table_from_pages() to a messed up sg_set_pages loop: > > + for_each_sg(sg->sgl, sgl, ubuf->pagecount, i) > + sg_set_page(sgl, ubuf->pages[i], PAGE_SIZE, ubuf->offsets[i]); > [..] > + ubuf->offsets[*pgbuf] = subpgoff << PAGE_SHIFT; > > Which is just the wrong way to use the scatterlist API. > > This was later changed to sg_set_folio() which I'm also suspecting has > a bug, it should be setting page_link to the proper tail page because > as you observe page_offset must fall within 0 to PAGE_SIZE-1 to make > the iterator work. > > I think the whole design here in udmabuf makes very little sense. It > starts out with an actual list of folios then expands them to a per-4K > double array of folio/offset. This is nonsensical, if it wants to > build a way to direct index the mapping for mmap it should just build > itself a page * array like the code used to do and continue to use > sg_alloc_table_from_pages() which builds properly formed scatterlists. > > This would save memory, use the APIs properly and build a correct and > optimized scatterlist to boot. It uses vmf_insert_pfn() and > vm_map_ram() anyhow so it doesn't even use a folio :\ > > Here, a few mins of AI shows what I think udmabuf should look like. If > you wish to persue this please add my signed-off-by and handle testing > it and getting it merged. I reviewed it enough to see it was showing > what I wanted. I don't know enough about folios or udmabuf to efficiently work on this. If offset is supposed to be in [0, PAGE_SIZE-1], then my patch is incorrect and it's probably better if some of the udmabuf maintainers take a look at this. I've added them to CC. > > Jason > > diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c > index 94b8ecb892bb17..5d687860445137 100644 > --- a/drivers/dma-buf/udmabuf.c > +++ b/drivers/dma-buf/udmabuf.c > @@ -26,10 +26,10 @@ MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is > > struct udmabuf { > pgoff_t pagecount; > - struct folio **folios; > + struct page **pages; > > /** > - * Unlike folios, pinned_folios is only used for unpin. > + * Unlike pages, pinned_folios is only used for unpin. > * So, nr_pinned is not the same to pagecount, the pinned_folios > * only set each folio which already pinned when udmabuf_create. > * Note that, since a folio may be pinned multiple times, each folio > @@ -41,7 +41,6 @@ struct udmabuf { > > struct sg_table *sg; > struct miscdevice *device; > - pgoff_t *offsets; > }; > > static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) > @@ -55,8 +54,7 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) > if (pgoff >= ubuf->pagecount) > return VM_FAULT_SIGBUS; > > - pfn = folio_pfn(ubuf->folios[pgoff]); > - pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; > + pfn = page_to_pfn(ubuf->pages[pgoff]); > > ret = vmf_insert_pfn(vma, vmf->address, pfn); > if (ret & VM_FAULT_ERROR) > @@ -73,8 +71,7 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) > if (WARN_ON(pgoff >= ubuf->pagecount)) > break; > > - pfn = folio_pfn(ubuf->folios[pgoff]); > - pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; > + pfn = page_to_pfn(ubuf->pages[pgoff]); > > /** > * If the below vmf_insert_pfn() fails, we do not return an > @@ -109,22 +106,11 @@ static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma) > static int vmap_udmabuf(struct dma_buf *buf, struct iosys_map *map) > { > struct udmabuf *ubuf = buf->priv; > - struct page **pages; > void *vaddr; > - pgoff_t pg; > > dma_resv_assert_held(buf->resv); > > - pages = kvmalloc_objs(*pages, ubuf->pagecount); > - if (!pages) > - return -ENOMEM; > - > - for (pg = 0; pg < ubuf->pagecount; pg++) > - pages[pg] = folio_page(ubuf->folios[pg], > - ubuf->offsets[pg] >> PAGE_SHIFT); > - > - vaddr = vm_map_ram(pages, ubuf->pagecount, -1); > - kvfree(pages); > + vaddr = vm_map_ram(ubuf->pages, ubuf->pagecount, -1); > if (!vaddr) > return -EINVAL; > > @@ -146,22 +132,18 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, > { > struct udmabuf *ubuf = buf->priv; > struct sg_table *sg; > - struct scatterlist *sgl; > - unsigned int i = 0; > int ret; > > sg = kzalloc_obj(*sg); > if (!sg) > return ERR_PTR(-ENOMEM); > > - ret = sg_alloc_table(sg, ubuf->pagecount, GFP_KERNEL); > + ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->pagecount, 0, > + ubuf->pagecount << PAGE_SHIFT, > + GFP_KERNEL); > if (ret < 0) > goto err_alloc; > > - for_each_sg(sg->sgl, sgl, ubuf->pagecount, i) > - sg_set_folio(sgl, ubuf->folios[i], PAGE_SIZE, > - ubuf->offsets[i]); > - > ret = dma_map_sgtable(dev, sg, direction, 0); > if (ret < 0) > goto err_map; > @@ -207,12 +189,8 @@ static void unpin_all_folios(struct udmabuf *ubuf) > > static __always_inline int init_udmabuf(struct udmabuf *ubuf, pgoff_t pgcnt) > { > - ubuf->folios = kvmalloc_objs(*ubuf->folios, pgcnt); > - if (!ubuf->folios) > - return -ENOMEM; > - > - ubuf->offsets = kvzalloc_objs(*ubuf->offsets, pgcnt); > - if (!ubuf->offsets) > + ubuf->pages = kvmalloc_objs(*ubuf->pages, pgcnt); > + if (!ubuf->pages) > return -ENOMEM; > > ubuf->pinned_folios = kvmalloc_objs(*ubuf->pinned_folios, pgcnt); > @@ -225,8 +203,7 @@ static __always_inline int init_udmabuf(struct udmabuf *ubuf, pgoff_t pgcnt) > static __always_inline void deinit_udmabuf(struct udmabuf *ubuf) > { > unpin_all_folios(ubuf); > - kvfree(ubuf->offsets); > - kvfree(ubuf->folios); > + kvfree(ubuf->pages); > } > > static void release_udmabuf(struct dma_buf *buf) > @@ -344,8 +321,8 @@ static long udmabuf_pin_folios(struct udmabuf *ubuf, struct file *memfd, > ubuf->pinned_folios[nr_pinned++] = folios[cur_folio]; > > for (; subpgoff < fsize; subpgoff += PAGE_SIZE) { > - ubuf->folios[upgcnt] = folios[cur_folio]; > - ubuf->offsets[upgcnt] = subpgoff; > + ubuf->pages[upgcnt] = folio_page(folios[cur_folio], > + subpgoff >> PAGE_SHIFT); > ++upgcnt; > > if (++cur_pgcnt >= pgcnt) >

2 months, 3 weeks

I HAVE RETRIEVED MY LOCKED BTC 🥳

by Ambrose MacQuoid

2 months, 3 weeks

[PATCH v2 0/2] dma-buf: heaps: Use page clearing helpers

by Linus Walleij

Use clear_pages() and clear_highpage() properly in the DMA heap allocator. Signed-off-by: Linus Walleij <linusw(a)kernel.org> --- Changes in v2: - Added a second patch to use the clear_highpage() helper. - Link to v1: https://lore.kernel.org/r/20260304-cma-heap-clear-pages-v1-1-6ff59da716d3@k… --- Linus Walleij (2): dma-buf: heaps: Clear CMA pages with clear_pages() dma-buf: heaps: Clear CMA highages using helper drivers/dma-buf/heaps/cma_heap.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) --- base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f change-id: 20260303-cma-heap-clear-pages-540f3ac9f734 Best regards, -- Linus Walleij <linusw(a)kernel.org>

2 months, 3 weeks

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Linaro-mm-sig March 2026