Linaro-mm-sig December 2025

linaro-mm-sig@lists.linaro.org

56 participants
44 discussions

[RFC v2 10/11] io_uring/rsrc: add dmabuf-backed buffer registeration

by asml.silence＠gmail.com

The content of this message was lost. It was probably cross-posted to multiple lists and previously handled on another list.

6 months, 2 weeks

[PATCH] dma-buf: fix WARNING in dma_buf_vmap

by Szymon Wilczek

When a driver's vmap callback returns an error (e.g. -ENOMEM), dma_buf_vmap() triggers a WARN_ON_ONCE(). This is incorrect as vmap operations can legitimately fail due to resource exhaustion or other transient conditions, as documented. Fix this by removing the WARN_ON_ONCE(). The error code is already correctly propagated to the caller. Reported-by: syzbot+4317d7108e14e5d56308(a)syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=4317d7108e14e5d56308 Signed-off-by: Szymon Wilczek <swilczek.lx(a)gmail.com> --- drivers/dma-buf/dma-buf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index edaa9e4ee4ae..14b55f67ee1c 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1525,7 +1525,7 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map) BUG_ON(iosys_map_is_set(&dmabuf->vmap_ptr)); ret = dmabuf->ops->vmap(dmabuf, &ptr); - if (WARN_ON_ONCE(ret)) + if (ret) return ret; dmabuf->vmap_ptr = ptr; -- 2.52.0

7 months

[PATCH] dma-buf: fix WARNING in dma_buf_vmap

by Szymon Wilczek

When a driver's vmap callback returns an error (e.g. -ENOMEM), dma_buf_vmap() triggers a WARN_ON_ONCE(). This is incorrect as vmap operations can legitimately fail due to resource exhaustion or other transient conditions, as documented. Fix this by removing the WARN_ON_ONCE(). The error code is already correctly propagated to the caller. Reported-by: syzbot+cd944c467e4d4bc24cf6(a)syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug\?extid\=4317d7108e14e5d56308 Signed-off-by: Szymon Wilczek <szymonwilczek(a)gmx.com> --- drivers/dma-buf/dma-buf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index edaa9e4ee4ae..14b55f67ee1c 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1525,7 +1525,7 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map) BUG_ON(iosys_map_is_set(&dmabuf->vmap_ptr)); ret = dmabuf->ops->vmap(dmabuf, &ptr); - if (WARN_ON_ONCE(ret)) + if (ret) return ret; dmabuf->vmap_ptr = ptr; -- 2.52.0

7 months

[PATCH 0/4] Rust GPUVM support

by Alice Ryhl

This makes a few changes to the way immediate mode works, and then it implements a Rust immediate mode GPUVM abstraction on top of that. Please see the following branch for example usage in Tyr: https://gitlab.freedesktop.org/panfrost/linux/-/merge_requests/53 For context, please see this previous patch: https://lore.kernel.org/rust-for-linux/20250621-gpuvm-v3-1-10203da06867@col… and the commit message of the last patch. Signed-off-by: Alice Ryhl <aliceryhl(a)google.com> --- Alice Ryhl (4): drm/gpuvm: take GEM lock inside drm_gpuvm_bo_obtain_prealloc() drm/gpuvm: drm_gpuvm_bo_obtain() requires lock and staged mode drm/gpuvm: use const for drm_gpuva_op_* ptrs rust: drm: add GPUVM immediate mode abstraction MAINTAINERS | 1 + drivers/gpu/drm/drm_gpuvm.c | 80 ++++-- drivers/gpu/drm/imagination/pvr_vm.c | 2 +- drivers/gpu/drm/msm/msm_gem.h | 2 +- drivers/gpu/drm/msm/msm_gem_vma.c | 2 +- drivers/gpu/drm/nouveau/nouveau_uvmm.c | 2 +- drivers/gpu/drm/panthor/panthor_mmu.c | 10 - drivers/gpu/drm/xe/xe_vm.c | 4 +- include/drm/drm_gpuvm.h | 12 +- rust/bindings/bindings_helper.h | 2 + rust/helpers/drm_gpuvm.c | 43 +++ rust/helpers/helpers.c | 1 + rust/kernel/drm/gpuvm/mod.rs | 394 +++++++++++++++++++++++++++ rust/kernel/drm/gpuvm/sm_ops.rs | 469 +++++++++++++++++++++++++++++++++ rust/kernel/drm/gpuvm/va.rs | 148 +++++++++++ rust/kernel/drm/gpuvm/vm_bo.rs | 213 +++++++++++++++ rust/kernel/drm/mod.rs | 1 + 17 files changed, 1337 insertions(+), 49 deletions(-) --- base-commit: 77b686f688126a5f758b51441a03186e9eb1b0f1 change-id: 20251128-gpuvm-rust-b719cac27ad6 Best regards, -- Alice Ryhl <aliceryhl(a)google.com>

7 months

Re: [PATCH 2/4] drm/gpuvm: drm_gpuvm_bo_obtain() requires lock and staged mode

by dakr＠kernel.org

The content of this message was lost. It was probably cross-posted to multiple lists and previously handled on another list.

7 months

[PATCH mm-hotfixes 0/4] mm kernel-doc fixes

by Bagas Sanjaya

Hi, Here are kernel-doc fixes for mm subsystem, based on mm-hotfixes-unstable branch. This series is split from previous assorted kernel-doc fixes series [1] with review trailers applied. I'm also including textsearch fix since there's currently no maintainer for include/linux/textsearch.h (get_maintainer.pl only shows LKML). Enjoy! [1]: https://lore.kernel.org/linux-fsdevel/20251215113903.46555-1-bagasdotme@gma… Bagas Sanjaya (4): mm: Describe @flags parameter in memalloc_flags_save() textsearch: Describe @list member in ts_ops search mm: vmalloc: Fix up vrealloc_node_align() kernel-doc macro name mm, kfence: Describe @slab parameter in __kfence_obj_info() include/linux/kfence.h | 1 + include/linux/sched/mm.h | 1 + include/linux/textsearch.h | 1 + mm/vmalloc.c | 2 +- 4 files changed, 4 insertions(+), 1 deletion(-) base-commit: 980dbceadd50af9437257d8095d4a3606818e8c4 -- An old man doll... just what I always wanted! - Clara

7 months

[PATCH 00/12] media: stm32: dcmi: stability & performance enhancements

by Alain Volmat

This series improve stability of the capture by fixing the handling of the overrun which was leading to captured frame corruption. Locking within the driver is also simplified and the way DMA is handled is reworked allowing to avoid having a specific handling for the JPEG data. Performances of capture can now be increased via the usage of a DMA->MDMA chaining which allows for capture of higher resolution / framerate. Signed-off-by: Alain Volmat <alain.volmat(a)foss.st.com> --- Alain Volmat (12): media: stm32: dcmi: Switch from __maybe_unused to pm_sleep_ptr() media: stm32: dcmi: perform dmaengine_slave_config at probe media: stm32: dcmi: only create dma descriptor once at buf_prepare media: stm32: dcmi: stop the dma transfer on overrun media: stm32: dcmi: rework spin_lock calls media: stm32: dcmi: perform all dma handling within irq_thread media: stm32: dcmi: use dmaengine_terminate_async in irq context media: stm32: dcmi: continuous mode capture in JPEG dt-bindings: media: st: dcmi: add DMA-MDMA chaining properties media: stm32: dcmi: addition of DMA-MDMA chaining support ARM: dts: stm32: add sram node within stm32mp151.dtsi ARM: dts: stm32: enable DCMI DMA-MDMA chaining on stm32mp157c-ev1.dts .../devicetree/bindings/media/st,stm32-dcmi.yaml | 13 +- arch/arm/boot/dts/st/stm32mp151.dtsi | 8 + arch/arm/boot/dts/st/stm32mp157c-ev1.dts | 15 + drivers/media/platform/st/stm32/stm32-dcmi.c | 470 ++++++++++++++------- 4 files changed, 341 insertions(+), 165 deletions(-) --- base-commit: f7231cff1f3ff8259bef02dc4999bc132abf29cf change-id: 20251213-stm32-dcmi-dma-chaining-9ea1da83007d Best regards, -- Alain Volmat <alain.volmat(a)foss.st.com>

7 months

[PATCH] drm/imagination: Disallow exporting of PM/FW protected objects

by Alessio Belle

These objects are meant to be used by the GPU firmware or by the PM unit within the GPU, in which case they may contain physical addresses. This adds a layer of protection against exposing potentially exploitable information outside of the driver. Fixes: ff5f643de0bf ("drm/imagination: Add GEM and VM related code") Signed-off-by: Alessio Belle <alessio.belle(a)imgtec.com> --- drivers/gpu/drm/imagination/pvr_gem.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/imagination/pvr_gem.c b/drivers/gpu/drm/imagination/pvr_gem.c index a66cf082af24..c07c9a915190 100644 --- a/drivers/gpu/drm/imagination/pvr_gem.c +++ b/drivers/gpu/drm/imagination/pvr_gem.c @@ -28,6 +28,16 @@ static void pvr_gem_object_free(struct drm_gem_object *obj) drm_gem_shmem_object_free(obj); } +static struct dma_buf *pvr_gem_export(struct drm_gem_object *obj, int flags) +{ + struct pvr_gem_object *pvr_obj = gem_to_pvr_gem(obj); + + if (pvr_obj->flags & DRM_PVR_BO_PM_FW_PROTECT) + return ERR_PTR(-EPERM); + + return drm_gem_prime_export(obj, flags); +} + static int pvr_gem_mmap(struct drm_gem_object *gem_obj, struct vm_area_struct *vma) { struct pvr_gem_object *pvr_obj = gem_to_pvr_gem(gem_obj); @@ -42,6 +52,7 @@ static int pvr_gem_mmap(struct drm_gem_object *gem_obj, struct vm_area_struct *v static const struct drm_gem_object_funcs pvr_gem_object_funcs = { .free = pvr_gem_object_free, .print_info = drm_gem_shmem_object_print_info, + .export = pvr_gem_export, .pin = drm_gem_shmem_object_pin, .unpin = drm_gem_shmem_object_unpin, .get_sg_table = drm_gem_shmem_object_get_sg_table, --- base-commit: ca2583412306ceda9304a7c4302fd9efbf43e963 change-id: 20251128-no-export-pm-fw-obj-aeca634ddd0a Best regards, -- Alessio Belle <alessio.belle(a)imgtec.com>

7 months

Re: [PATCH 05/19] dma-buf/selftests: test RCU ops and inline lock

by tursulin＠ursulin.net

The content of this message was lost. It was probably cross-posted to multiple lists and previously handled on another list.

7 months

[PATCH 00/14] Assorted kernel-doc fixes

by Bagas Sanjaya

Hi, Here are assorted kernel-doc fixes for 6.19 cycle. As the name implies, for the merging strategy, the patches can be taken by respective maintainers to appropriate fixes branches (targetting 6.19 of course) (e.g. for mm it will be mm-hotfixes). Enjoy! Bagas Sanjaya (14): genalloc: Describe @start_addr parameter in genpool_algo_t mm: Describe @flags parameter in memalloc_flags_save() textsearch: Describe @list member in ts_ops search mm: vmalloc: Fix up vrealloc_node_align() kernel-doc macro name mm, kfence: Describe @slab parameter in __kfence_obj_info() virtio: Describe @map and @vmap members in virtio_device struct fs: Describe @isnew parameter in ilookup5_nowait() VFS: fix __start_dirop() kernel-doc warnings drm/amd/display: Don't use kernel-doc comment in dc_register_software_state struct drm/amdgpu: Describe @AMD_IP_BLOCK_TYPE_RAS in amd_ip_block_type enum drm/gem/shmem: Describe @shmem and @size parameters drm/scheduler: Describe @result in drm_sched_job_done() drm/gpusvm: Fix drm_gpusvm_pages_valid_unlocked() kernel-doc comment net: bridge: Describe @tunnel_hash member in net_bridge_vlan_group struct drivers/gpu/drm/amd/display/dc/dc.h | 2 +- drivers/gpu/drm/amd/include/amd_shared.h | 1 + drivers/gpu/drm/drm_gem_shmem_helper.c | 3 ++- drivers/gpu/drm/drm_gpusvm.c | 4 ++-- drivers/gpu/drm/scheduler/sched_main.c | 1 + fs/inode.c | 1 + fs/namei.c | 3 ++- include/linux/genalloc.h | 1 + include/linux/kfence.h | 1 + include/linux/sched/mm.h | 1 + include/linux/textsearch.h | 1 + include/linux/virtio.h | 2 ++ mm/vmalloc.c | 2 +- net/bridge/br_private.h | 1 + 14 files changed, 18 insertions(+), 6 deletions(-) base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 -- An old man doll... just what I always wanted! - Clara

7 months

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Linaro-mm-sig December 2025