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[PATCH V13 0/7] Rust support for powerpc

by Mukesh Kumar Chaurasiya (IBM)

Enable experimental rust support for ppc64le and ppc32be. The patch for ppc32 has been provided by Link Mauve[1] and ppc64le support[2] has been merged over it. ppc32 needs some toolchain fixes mentioned in the patch `rust: Add PowerPC support` and the discussion for that is done here[1]. This has been tested on - powernv9 hardware - pseries P11 hardware - pseries(9, 10) qemu - powernv(9, 10) qemu - rustdoc on x86 and powerpc64le - rusttest on x86 and powerpc64le We are actively working with our LLVM team to get the target for ppc, ppc64 and ppc64le in the rust compiler. [1] https://lore.kernel.org/all/20260204030507.8203-1-linkmauve@linkmauve.fr [2] https://lore.kernel.org/all/20260204042417.83903-1-mkchauras@gmail.com Changelog: V12 -> V13: - Added a patch for fixing build issue on ppc32 by Link Mauve - Added another patch to fix a build issue in dma-buf - Added another patch to enforce minimum `rustc` version for powerpc V12: https://lore.kernel.org/all/20260421120958.190430-1-mkchauras@gmail.com/ V11 -> V12: - Rebased to mainline (rust/Makefile conflict resolved) V11: https://lore.kernel.org/all/20260417152253.2312961-1-mkchauras@gmail.com/ V10 -> V11: - Updated `rust/Makefile` - Not all libraries are move to `rust/host` directory now. Only proc_macro2, quote and syn are moved - Special handling for pin init is added. Details in commit - Removed mkdir for `rust/host`, this is now handled by toolchain. V10: https://lore.kernel.org/all/20260406200149.3727922-1-mkchauras@gmail.com/ V9 -> V10: - rust/Makefile updated with review comments from Miguel - Patch 1/4 updated with commit message and subject V9: https://lore.kernel.org/all/20260404121610.1956528-1-mkchauras@gmail.com/ V8 -> V9: - rust/Makefile updated with a directory instead of abspath V8: https://lore.kernel.org/all/20260403145308.1042622-1-mkchauras@gmail.com/ V7 -> V8: - rust/Makefile updated to separate host libraries from target V7: https://lore.kernel.org/all/20260329160254.2592207-1-mkchauras@gmail.com/ Changelog: V6 -> V7: - Documentation removed as powerpc is still under development - Added a fix for race condition in rust/Makefile V6: https://lore.kernel.org/all/20260210090023.2587534-1-mkchauras@gmail.com V5 -> V6: - Added a missing Tested by from Venkat which got missed since V3 - Support is marked as Maintained instead of experimental V5: https://lore.kernel.org/all/20260210053756.2088302-1-mkchauras@gmail.com V4 -> V5: - Removed a nested ifdef from PPC64 for Little endian toolchain V4: https://lore.kernel.org/all/20260209105456.1551677-1-mkchauras@gmail.com V3 -> V4: - Co-developed-by header added in patch 1 V3: https://lore.kernel.org/all/20260205180429.3280657-1-mkchauras@gmail.com V2 -> V3: - Splited HAVE_RUST in 2 lines - BINDGEN_TARGET_powerpc initialized before assigning the same to BINDGEN_TARGET V2: https://lore.kernel.org/all/20260204210125.613350-1-mkchauras@gmail.com V1 -> V2: - jump label fix for rust has been moved to a separate patch - PPC32 support has been taken - rust support has been marked experimental - target.json dependency has been removed - HAVE_RUST now depends on CPU_LITTLE_ENDIAN for PPC64 Link Mauve (2): rust: Make __udivdi3() and __umoddi3() panic rust: Add PowerPC support Mukesh Kumar Chaurasiya (IBM) (5): rust: Fix "multiple candidates for rmeta dependency core" error dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled powerpc/jump_label: adjust inline asm to be consistent rust/powerpc: Set min rustc version for powerpc powerpc: Enable Rust for ppc64le arch/powerpc/Kconfig | 2 ++ arch/powerpc/Makefile | 7 ++++ arch/powerpc/include/asm/jump_label.h | 23 ++++++------ include/linux/dma-resv.h | 2 +- rust/Makefile | 52 +++++++++++++++++---------- rust/compiler_builtins.rs | 6 ++++ scripts/min-tool-version.sh | 6 +++- 7 files changed, 68 insertions(+), 30 deletions(-) -- 2.53.0

5 months

[PATCH v12 0/5] Rust bindings for gem shmem

by Lyude Paul

Most of this patch series has already been pushed upstream, this is just the second half of the patch series that has not been pushed yet + some additional changes which were required to implement changes requested by the mailing list. This patch series is originally from Asahi, previously posted by Daniel Almeida. The previous version of the patch series can be found here: https://patchwork.freedesktop.org/series/164580/ Branch with patches applied available here sure this builds: https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem This patch series applies on top of drm-rust-next Lyude Paul (5): rust: drm: gem: s/device::Device/Device/ for shmem.rs drm/gem/shmem: Introduce __drm_gem_shmem_free_sgt_locked() drm/gem/shmem: Export drm_gem_shmem_get_pages_sgt_locked() rust: drm: gem: Introduce shmem::SGTable rust: drm: gem: Add vmap functions to shmem bindings drivers/gpu/drm/drm_gem_shmem_helper.c | 48 ++- include/drm/drm_gem_shmem_helper.h | 2 + rust/kernel/drm/gem/shmem.rs | 557 ++++++++++++++++++++++++- 3 files changed, 593 insertions(+), 14 deletions(-) base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd -- 2.53.0

5 months

[PATCH RFC 00/26] Add DMA-buf mapping types and convert vfio/iommufd to use them

by Jason Gunthorpe

Since its introduction, DMA-buf has only supported using scatterlist for the exporter and importer to exchange address information. This is not sufficient for all use cases as dma_addr_t is a very specific and limited type that should not be abused for things unrelated to the DMA API. There are several motivations for addressing this now: 1) VFIO to IOMMUFD and KVM requires a physical address, not a dma_addr_t scatterlist, it cannot be represented in the scatterlist structure 2) xe vGPU requires the host driver to accept a DMABUF from VFIO of its own VF and convert it into an internal VRAM address on the PF 3) We are starting to look at replacement datastructures for scatterlist 4) Ideas around UALink/etc are suggesting not using the DMA API None of these can sanely be achieved using scatterlist. Introduce a new mechanism called "mapping types" which allows DMA-buf to work with more map/unmap options than scatterlist. Each mapping type encompasses a full set of functions and data unique to itself. The core code provides a match-making system to select the best type offered by the exporter and importer to be the active mapping type for the attachment. Everything related to scatterlist is moved into a DMA-buf SGT mapping type, and into the "dma_buf_sgt_*" namespace for clarity. Existing exporters are moved over to explicitly declare SGT mapping types and importers are adjusted to use the dma_buf_sgt_* named importer helpers. Mapping types are designed to be extendable, a driver can declare its own mapping type for its internal private interconnect and use that without having to adjust the core code. The new attachment sequence starts with the importing driver declaring what mapping types it can accept: struct dma_buf_mapping_match imp_match[] = { DMA_BUF_IMAPPING_MY_DRIVER(dev, ...), DMA_BUF_IMAPPING_SGT(dev, false), }; attach = dma_buf_mapping_attach(dmabuf, imp_match, ...) Most drivers will do this via a dma_buf_sgt_*attach() helper. The exporting driver can then declare what mapping types it can supply: int exporter_match_mapping(struct dma_buf_match_args *args) { struct dma_buf_mapping_match exp_match[] = { DMA_BUF_EMAPPING_MY_DRIVER(my_ops, dev, ...), DMA_BUF_EMAPPING_SGT(sgt_ops, dev, false), DMA_BUF_EMAPPING_PAL(PAL_ops), }; return dma_buf_match_mapping(args, exp_match, ...); } Most drivers will do this via a helper: static const struct dma_buf_ops ops = { DMA_BUF_SIMPLE_SGT_EXP_MATCH(map_func, unmap_func) }; During dma_buf_mapping_attach() the core code will select a mutual match between the importer and exporter and record it as the active match in the attach->map_type. Each mapping type has its own types/function calls for mapping/unmapping, and storage in the attach->map_type for its information. As such each mapping type can offer function signatures and data that exactly matches its needs. This series goes through a sequence of: 1) Introduce the basic mapping type framework and the main components of the SGT mapping type 2) Automatically make all existing exporters and importers use core generated SGT mapping types so every attachment has a SGT mapping type 3) Convert all exporter drivers to natively create a SGT mapping type 4) Move all dma_buf_* functions and types that are related to SGT into dma_buf_sgt_* 5) Remove all the now-unused items that have been moved into SGT specific structures. 6) Demonstrate adding a new Physical Address List alongside SGT. Due to the high number of files touched I would expect this to be broken into phases, but this shows the entire picture. This is on github: https://github.com/jgunthorpe/linux/commits/dmabuf_map_type It is a followup to the discussion here: https://lore.kernel.org/dri-devel/20251027044712.1676175-1-vivek.kasireddy@… Jason Gunthorpe (26): dma-buf: Introduce DMA-buf mapping types dma-buf: Add the SGT DMA mapping type dma-buf: Add dma_buf_mapping_attach() dma-buf: Route SGT related actions through attach->map_type dma-buf: Allow single exporter drivers to avoid the match_mapping function drm: Check the SGT ops for drm_gem_map_dma_buf() dma-buf: Convert all the simple exporters to use SGT mapping type drm/vmwgfx: Use match_mapping instead of dummy calls accel/habanalabs: Use the SGT mapping type drm/xe/dma-buf: Use the SGT mapping type drm/amdgpu: Use the SGT mapping type vfio/pci: Change the DMA-buf exporter to use mapping_type dma-buf: Update dma_buf_phys_vec_to_sgt() to use the SGT mapping type iio: buffer: convert to use the SGT mapping type functionfs: convert to use the SGT mapping type dma-buf: Remove unused SGT stuff from the common structures treewide: Rename dma_buf_map_attachment(_unlocked) to dma_buf_sgt_ treewide: Rename dma_buf_unmap_attachment(_unlocked) to dma_buf_sgt_* treewide: Rename dma_buf_attach() to dma_buf_sgt_attach() treewide: Rename dma_buf_dynamic_attach() to dma_buf_sgt_dynamic_attach() dma-buf: Add the Physical Address List DMA mapping type vfio/pci: Add physical address list support to DMABUF iommufd: Use the PAL mapping type instead of a vfio function iommufd: Support DMA-bufs with multiple physical ranges iommufd/selftest: Check multi-phys DMA-buf scenarios dma-buf: Add kunit tests for mapping type Documentation/gpu/todo.rst | 2 +- drivers/accel/amdxdna/amdxdna_gem.c | 14 +- drivers/accel/amdxdna/amdxdna_ubuf.c | 10 +- drivers/accel/habanalabs/common/memory.c | 54 ++- drivers/accel/ivpu/ivpu_gem.c | 10 +- drivers/accel/ivpu/ivpu_gem_userptr.c | 11 +- drivers/accel/qaic/qaic_data.c | 8 +- drivers/dma-buf/Makefile | 1 + drivers/dma-buf/dma-buf-mapping.c | 186 ++++++++- drivers/dma-buf/dma-buf.c | 180 ++++++--- drivers/dma-buf/heaps/cma_heap.c | 12 +- drivers/dma-buf/heaps/system_heap.c | 13 +- drivers/dma-buf/st-dma-mapping.c | 373 ++++++++++++++++++ drivers/dma-buf/udmabuf.c | 8 +- drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 98 +++-- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 6 +- drivers/gpu/drm/armada/armada_gem.c | 33 +- drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +- drivers/gpu/drm/drm_prime.c | 31 +- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 18 +- drivers/gpu/drm/i915/gem/i915_gem_object.c | 2 +- .../drm/i915/gem/selftests/i915_gem_dmabuf.c | 8 +- .../gpu/drm/i915/gem/selftests/mock_dmabuf.c | 8 +- drivers/gpu/drm/msm/msm_gem_prime.c | 7 +- drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 11 +- drivers/gpu/drm/tegra/gem.c | 33 +- drivers/gpu/drm/virtio/virtgpu_prime.c | 23 +- drivers/gpu/drm/vmwgfx/vmwgfx_prime.c | 32 +- drivers/gpu/drm/xe/xe_bo.c | 18 +- drivers/gpu/drm/xe/xe_dma_buf.c | 61 +-- drivers/iio/industrialio-buffer.c | 15 +- drivers/infiniband/core/umem_dmabuf.c | 15 +- drivers/iommu/iommufd/io_pagetable.h | 4 +- drivers/iommu/iommufd/iommufd_private.h | 8 - drivers/iommu/iommufd/iommufd_test.h | 7 + drivers/iommu/iommufd/pages.c | 85 ++-- drivers/iommu/iommufd/selftest.c | 177 ++++++--- .../media/common/videobuf2/videobuf2-core.c | 2 +- .../common/videobuf2/videobuf2-dma-contig.c | 26 +- .../media/common/videobuf2/videobuf2-dma-sg.c | 21 +- .../common/videobuf2/videobuf2-vmalloc.c | 13 +- .../platform/nvidia/tegra-vde/dmabuf-cache.c | 9 +- drivers/misc/fastrpc.c | 21 +- drivers/tee/tee_heap.c | 13 +- drivers/usb/gadget/function/f_fs.c | 11 +- drivers/vfio/pci/vfio_pci_dmabuf.c | 79 ++-- drivers/xen/gntdev-dmabuf.c | 29 +- include/linux/dma-buf-mapping.h | 297 ++++++++++++++ include/linux/dma-buf.h | 168 ++++---- io_uring/zcrx.c | 9 +- net/core/devmem.c | 14 +- samples/vfio-mdev/mbochs.c | 10 +- sound/soc/fsl/fsl_asrc_m2m.c | 12 +- tools/testing/selftests/iommu/iommufd.c | 43 ++ tools/testing/selftests/iommu/iommufd_utils.h | 17 + 55 files changed, 1764 insertions(+), 614 deletions(-) create mode 100644 drivers/dma-buf/st-dma-mapping.c base-commit: c63e5a50e1dd291cd95b04291b028fdcaba4c534 -- 2.43.0

5 months

[PATCH v11 0/5] Rust bindings for gem shmem

by Lyude Paul

Most of this patch series has already been pushed upstream, this is just the second half of the patch series that has not been pushed yet + some additional changes which were required to implement changes requested by the mailing list. This patch series is originally from Asahi, previously posted by Daniel Almeida. The previous version of the patch series can be found here: https://patchwork.freedesktop.org/series/164580/ Branch with patches applied available here (+ a hack required to make sure this builds: https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem This patch series applies on top of drm-rust-next Lyude Paul (5): rust: drm: gem: s/device::Device/Device/ for shmem.rs drm/gem/shmem: Introduce __drm_gem_shmem_free_sgt_locked() drm/gem/shmem: Export drm_gem_shmem_get_pages_sgt_locked() rust: drm: gem: Introduce shmem::SGTable rust: drm: gem: Add vmap functions to shmem bindings drivers/gpu/drm/drm_gem_shmem_helper.c | 48 ++- include/drm/drm_gem_shmem_helper.h | 2 + rust/kernel/drm/gem/shmem.rs | 557 ++++++++++++++++++++++++- 3 files changed, 593 insertions(+), 14 deletions(-) base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd -- 2.53.0

5 months

[PATCH v10 0/5] Rust bindings for gem shmem

by Lyude Paul

Most of this patch series has already been pushed upstream, this is just the second half of the patch series that has not been pushed yet + some additional changes which were required to implement changes requested by the mailing list. This patch series is originally from Asahi, previously posted by Daniel Almeida. The previous version of the patch series can be found here: (apparently it mistakenly was not sent to dri-devel, so no patchwork ): https://patchwork.freedesktop.org/series/156093/ Branch with patches applied available here (+ a hack required to make sure this builds: https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem Lyude Paul (5): rust: drm: gem: s/device::Device/Device/ for shmem.rs drm/gem/shmem: Introduce __drm_gem_shmem_free_sgt_locked() drm/gem/shmem: Export drm_gem_shmem_get_pages_sgt_locked() rust: drm: gem: Introduce shmem::SGTable rust: drm: gem: Add vmap functions to shmem bindings drivers/gpu/drm/drm_gem_shmem_helper.c | 48 ++- include/drm/drm_gem_shmem_helper.h | 2 + rust/kernel/drm/gem/shmem.rs | 553 ++++++++++++++++++++++++- 3 files changed, 590 insertions(+), 13 deletions(-) base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd -- 2.53.0

5 months

Slithering into Fun: Mastering the Classic Snake Game

by serious.halibut.leeg＠hidingmail.com

The Snake Game – simple, addictive, and utterly timeless. It's a game that has graced countless screens, from early mobile phones to web browsers, and continues to be a source of casual entertainment for millions. But behind its deceptively simple premise lies a surprising amount of skill and strategy. Let's dive into how to not just play the Snake Game, but how to experience it. https://snakegame.onl Gameplay: A Simple Dance of Digits and Delight The core concept of the Snake Game is beautifully straightforward. You control a snake, initially a small line segment, navigating within a defined play area. Your goal? To consume food, typically represented by small dots or blocks, without crashing into the walls, your own body, or obstacles if any are present in the version you're playing. Each time your snake eats food, it grows longer, increasing the difficulty as maneuvering space becomes more constrained. The game ends when you collide with yourself or the boundaries of the play area. Sound easy? Try it! The real challenge lies in predicting future movements, planning efficient paths, and adapting to the ever-increasing length of your serpentine friend. Many variations of the Snake Game exist, often with added features like walls within the playing field, power-ups, and different control schemes. Some even offer multiplayer options, allowing you to compete against friends or other players online. Regardless of the specific version, the fundamental mechanics remain the same. Tips and Tricks: Becoming a Snake Charmer While the Snake Game appears luck-based at times, mastering a few key strategies can significantly improve your score and extend your gameplay: Plan Ahead: Don’t just react to the immediate situation. Try to anticipate your snake's movements several steps in advance. Visualize the path you'll need to take to collect the next food pellet without painting yourself into a corner. Utilize Corners: Corners are your best friends. They provide a temporary safe haven where you can change direction and reassess your surroundings. Master the art of hugging the walls and making sharp turns. Create Space: As your snake grows, space becomes a precious commodity. Aim to create loops and empty areas within the playing field to give yourself more room to maneuver. A well-executed loop can buy you valuable time and prevent a fatal crash. Patience is Key: Don’t rush. Sometimes the best strategy is to wait for an opportunity to present itself. Avoid making risky moves that could lead to a premature end. Learn the Algorithm (Sort Of): Some players find it beneficial to develop a mental "algorithm" or pattern for their snake's movements. This could involve consistently circling the outer edges of the play area or employing a specific sequence of turns. Experiment to find what works best for you. Embrace the Simplicity: A Timeless Classic The Snake Game is more than just a game; it's a piece of digital history. Its enduring appeal lies in its simplicity, accessibility, and addictive gameplay. Whether you're a seasoned veteran or a newcomer, there's always something to enjoy about this classic title. So, fire up your device, control your snake, and get ready for a slithering good time. You might be surprised at how engaging this seemingly simple game can be!

5 months, 1 week

[PATCH] usb: gadget: f_fs: serialize DMABUF cancel against request completion

by Michael Bommarito

ffs_epfile_dmabuf_io_complete() calls usb_ep_free_request() on the completed request but leaves priv->req, the back-pointer that ffs_dmabuf_transfer() set on submission, pointing at the freed memory. A later FUNCTIONFS_DMABUF_DETACH ioctl or ffs_epfile_release() on the close path still sees priv->req non-NULL under ffs->eps_lock: if (priv->ep && priv->req) usb_ep_dequeue(priv->ep, priv->req); so usb_ep_dequeue() is called on a freed usb_request. On dummy_hcd the dequeue path only walks a live queue and pointer-compares, so the freed pointer reads without faulting and KASAN requires an explicit check at the FunctionFS call site to surface the use-after-free. On SG-capable in-tree UDCs the dequeue path dereferences the supplied request immediately: * chipidea's ep_dequeue() does container_of(req, struct ci_hw_req, req) and reads hwreq->req.status before acquiring its own lock. * cdnsp's cdnsp_gadget_ep_dequeue() reads request->status first. The narrower option of clearing priv->req via cmpxchg() in the completion does not close the race: the completion runs without eps_lock, so a cancel path holding eps_lock can still observe priv->req non-NULL, race a concurrent completion that clears and frees, and pass the freed pointer to usb_ep_dequeue(). A slightly longer fix that moves the free into the cleanup work is needed. Same class of lifetime race as the recent usbip-vudc timer fix [1]. Take eps_lock in the sole place that mutates priv->req from the callback direction by moving usb_ep_free_request() out of the completion into ffs_dmabuf_cleanup(), the existing work handler scheduled by ffs_dmabuf_signal_done() on ffs->io_completion_wq. Clear priv->req there under eps_lock before freeing, and only clear if priv->req still names our request (a subsequent ffs_dmabuf_transfer() on the same attachment may have queued a new one). This keeps the existing dummy_hcd sync-dequeue invariant: the completion callback is still invoked by the UDC without eps_lock held (dummy_hcd drops its own lock before calling the callback), and the callback now takes no f_fs lock at all. Serialization against the cancel path happens in cleanup, which runs from the workqueue with no f_fs lock held on entry. The priv ref count protects the containing ffs_dmabuf_priv: ffs_dmabuf_transfer() takes a ref via ffs_dmabuf_get(), cleanup drops it via ffs_dmabuf_put(), so priv stays live for the cleanup even after the cancel path's list_del + ffs_dmabuf_put. The ffs_dmabuf_transfer() error path no longer frees usb_req inline: fence->req and fence->ep are set before usb_ep_queue(), so ffs_dmabuf_cleanup() (scheduled by the error-path ffs_dmabuf_signal_done()) owns the free regardless of whether the queue succeeded. Reproduced under KASAN on both detach and close paths against dummy_hcd with an observability hook (kasan_check_byte(priv->req) immediately before usb_ep_dequeue) at the two FunctionFS cancel sites to surface the stale-pointer access; the hook is not part of this patch. The KASAN allocator / free stacks in the captured splats identify the same request: alloc in dummy_alloc_request, free in dummy_timer, fault reached from ffs_epfile_release (close) and from the FUNCTIONFS_DMABUF_DETACH ioctl (detach). With the patch applied, both paths are silent under the same hook. The bug is reached from the FunctionFS device node, which in real deployments is owned by the privileged gadget daemon (adbd, UMS, composite gadget services, etc.); it is not reachable from unprivileged userspace or from a USB host on the cable. FunctionFS mounts default to GLOBAL_ROOT_UID, but the filesystem supports uid=, gid=, and fmode= delegation to a non-root gadget daemon, so on real deployments the attacker may be a less-privileged service rather than root. Fixes: 7b07a2a7ca02 ("usb: gadget: functionfs: Add DMABUF import interface") Link: https://lore.kernel.org/all/20260417163552.807548-1-michael.bommarito@gmail… [1] Cc: stable(a)vger.kernel.org Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Michael Bommarito <michael.bommarito(a)gmail.com> --- drivers/usb/gadget/function/f_fs.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 815639506520..75912ce6ab55 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -150,6 +150,8 @@ struct ffs_dma_fence { struct dma_fence base; struct ffs_dmabuf_priv *priv; struct work_struct work; + struct usb_ep *ep; + struct usb_request *req; }; struct ffs_epfile { @@ -1385,6 +1387,21 @@ static void ffs_dmabuf_cleanup(struct work_struct *work) struct ffs_dmabuf_priv *priv = dma_fence->priv; struct dma_buf_attachment *attach = priv->attach; struct dma_fence *fence = &dma_fence->base; + struct usb_request *req = dma_fence->req; + struct usb_ep *ep = dma_fence->ep; + + /* + * eps_lock pairs with the cancel paths so they cannot pass a freed + * req to usb_ep_dequeue(). Only clear if priv->req still names ours; + * a re-queue on the same attachment may have taken that slot. + */ + spin_lock_irq(&priv->ffs->eps_lock); + if (priv->req == req) + priv->req = NULL; + spin_unlock_irq(&priv->ffs->eps_lock); + + if (ep && req) + usb_ep_free_request(ep, req); ffs_dmabuf_put(attach); dma_fence_put(fence); @@ -1414,8 +1431,8 @@ static void ffs_epfile_dmabuf_io_complete(struct usb_ep *ep, struct usb_request *req) { pr_vdebug("FFS: DMABUF transfer complete, status=%d\n", req->status); + /* req is freed by ffs_dmabuf_cleanup() under eps_lock. */ ffs_dmabuf_signal_done(req->context, req->status); - usb_ep_free_request(ep, req); } static const char *ffs_dmabuf_get_driver_name(struct dma_fence *fence) @@ -1699,6 +1716,10 @@ static int ffs_dmabuf_transfer(struct file *file, usb_req->context = fence; usb_req->complete = ffs_epfile_dmabuf_io_complete; + /* ffs_dmabuf_cleanup() frees usb_req via these two fields. */ + fence->req = usb_req; + fence->ep = ep->ep; + cookie = dma_fence_begin_signalling(); ret = usb_ep_queue(ep->ep, usb_req, GFP_ATOMIC); dma_fence_end_signalling(cookie); @@ -1708,7 +1729,6 @@ static int ffs_dmabuf_transfer(struct file *file, } else { pr_warn("FFS: Failed to queue DMABUF: %d\n", ret); ffs_dmabuf_signal_done(fence, ret); - usb_ep_free_request(ep->ep, usb_req); } spin_unlock_irq(&epfile->ffs->eps_lock); -- 2.53.0

5 months, 1 week

[PATCH v2 00/19] tracepoint: Avoid double static_branch evaluation at guarded call sites

by Vineeth Pillai (Google)

When a caller already guards a tracepoint with an explicit enabled check: if (trace_foo_enabled() && cond) trace_foo(args); trace_foo() internally re-evaluates the static_branch_unlikely() key. Since static branches are patched binary instructions the compiler cannot fold the two evaluations, so every such site pays the cost twice. This series introduces trace_call__##name() as a companion to trace_##name(). It calls __do_trace_##name() directly, bypassing the redundant static-branch re-check, while preserving all other correctness properties of the normal path (RCU-watching assertion, might_fault() for syscall tracepoints). The internal __do_trace_##name() symbol is not leaked to call sites; trace_call__##name() is the only new public API. if (trace_foo_enabled() && cond) trace_call__foo(args); /* calls __do_trace_foo() directly */ The first patch adds the three-location change to include/linux/tracepoint.h (__DECLARE_TRACE, __DECLARE_TRACE_SYSCALL, and the !TRACEPOINTS_ENABLED stub). The remaining 18 patches mechanically convert all guarded call sites found in the tree: kernel/, io_uring/, net/, accel/habanalabs, cpufreq/, devfreq/, dma-buf/, fsi/, drm/, HID, i2c/, spi/, scsi/ufs/, btrfs/, net/devlink/, kernel/time/, kernel/trace/, mm/damon/, and arch/x86/. This series is motivated by Peter Zijlstra's observation in the discussion around Dmitry Ilvokhin's locking tracepoint instrumentation series, where he noted that compilers cannot optimize static branches and that guarded call sites end up evaluating the static branch twice for no reason, and by Steven Rostedt's suggestion to add a proper API instead of exposing internal implementation details like __do_trace_##name() directly to call sites: https://lore.kernel.org/linux-trace-kernel/8298e098d3418cb446ef396f119edac5… Suggested-by: Steven Rostedt <rostedt(a)goodmis.org> Suggested-by: Peter Zijlstra <peterz(a)infradead.org> Changes in v2: - Renamed trace_invoke_##name() to trace_call__##name() (double underscore) per review comments. - Added 4 new patches covering sites missed in v1, found using coccinelle to scan the tree (Keith Busch): * net/devlink: guarded tracepoint_enabled() block in trap.c * kernel/time: early-return guard in tick-sched.c (tick_stop) * kernel/trace: early-return guard in trace_benchmark.c * mm/damon: early-return guard in core.c * arch/x86: do_trace_*() wrapper functions in lib/msr.c, which are called exclusively from tracepoint_enabled()-guarded sites in asm/msr.h v1: https://lore.kernel.org/linux-trace-kernel/abSqrJ1J59RQC47U@kbusch-mbp/ Vineeth Pillai (Google) (19): tracepoint: Add trace_call__##name() API kernel: Use trace_call__##name() at guarded tracepoint call sites io_uring: Use trace_call__##name() at guarded tracepoint call sites net: Use trace_call__##name() at guarded tracepoint call sites accel/habanalabs: Use trace_call__##name() at guarded tracepoint call sites cpufreq: Use trace_call__##name() at guarded tracepoint call sites devfreq: Use trace_call__##name() at guarded tracepoint call sites dma-buf: Use trace_call__##name() at guarded tracepoint call sites fsi: Use trace_call__##name() at guarded tracepoint call sites drm: Use trace_call__##name() at guarded tracepoint call sites HID: Use trace_call__##name() at guarded tracepoint call sites i2c: Use trace_call__##name() at guarded tracepoint call sites spi: Use trace_call__##name() at guarded tracepoint call sites scsi: ufs: Use trace_call__##name() at guarded tracepoint call sites btrfs: Use trace_call__##name() at guarded tracepoint call sites net: devlink: Use trace_call__##name() at guarded tracepoint call sites kernel: time, trace: Use trace_call__##name() at guarded tracepoint call sites mm: damon: Use trace_call__##name() at guarded tracepoint call sites x86: msr: Use trace_call__##name() at guarded tracepoint call sites arch/x86/lib/msr.c | 6 +++--- drivers/accel/habanalabs/common/device.c | 12 ++++++------ drivers/accel/habanalabs/common/mmu/mmu.c | 3 ++- drivers/accel/habanalabs/common/pci/pci.c | 4 ++-- drivers/cpufreq/amd-pstate.c | 10 +++++----- drivers/cpufreq/cpufreq.c | 2 +- drivers/cpufreq/intel_pstate.c | 2 +- drivers/devfreq/devfreq.c | 2 +- drivers/dma-buf/dma-fence.c | 4 ++-- drivers/fsi/fsi-master-aspeed.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 4 ++-- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +- drivers/gpu/drm/scheduler/sched_entity.c | 4 ++-- drivers/hid/intel-ish-hid/ipc/pci-ish.c | 2 +- drivers/i2c/i2c-core-slave.c | 2 +- drivers/spi/spi-axi-spi-engine.c | 4 ++-- drivers/ufs/core/ufshcd.c | 12 ++++++------ fs/btrfs/extent_map.c | 4 ++-- fs/btrfs/raid56.c | 4 ++-- include/linux/tracepoint.h | 11 +++++++++++ io_uring/io_uring.h | 2 +- kernel/irq_work.c | 2 +- kernel/sched/ext.c | 2 +- kernel/smp.c | 2 +- kernel/time/tick-sched.c | 12 ++++++------ kernel/trace/trace_benchmark.c | 2 +- mm/damon/core.c | 2 +- net/core/dev.c | 2 +- net/core/xdp.c | 2 +- net/devlink/trap.c | 2 +- net/openvswitch/actions.c | 2 +- net/openvswitch/datapath.c | 2 +- net/sctp/outqueue.c | 2 +- net/tipc/node.c | 2 +- 35 files changed, 74 insertions(+), 62 deletions(-) -- 2.53.0

5 months, 1 week

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5 months, 1 week

[PATCH 0/8] drm/imagination: Job submission fixes and cleanup

by Alessio Belle

The first two commits fix rare bugs and should be backported to stable branches. The rest is an attempt to cleanup and document the code to make it a bit easier to understand. Signed-off-by: Alessio Belle <alessio.belle(a)imgtec.com> --- Alessio Belle (8): drm/imagination: Count paired job fence as dependency in prepare_job() drm/imagination: Fit paired fragment job in the correct CCCB drm/imagination: Skip check on paired job fence during job submission drm/imagination: Rename pvr_queue_fence_is_ufo_backed() to reflect usage drm/imagination: Rename fence returned by pvr_queue_job_arm() drm/imagination: Move repeated job fence check to its own function drm/imagination: Update check to skip prepare_job() for fragment jobs drm/imagination: Minor improvements to job submission code documentation drivers/gpu/drm/imagination/pvr_job.c | 8 +- drivers/gpu/drm/imagination/pvr_queue.c | 154 +++++++++++++-------- drivers/gpu/drm/imagination/pvr_queue.h | 2 +- .../gpu/drm/imagination/pvr_rogue_fwif_shared.h | 10 +- drivers/gpu/drm/imagination/pvr_sync.c | 8 +- drivers/gpu/drm/imagination/pvr_sync.h | 2 +- 6 files changed, 110 insertions(+), 74 deletions(-) --- base-commit: 3bce3fdd1ff2ba242f76ab66659fff27207299f1 change-id: 20260330-job-submission-fixes-cleanup-83e01196c3e9 Best regards, -- Alessio Belle <alessio.belle(a)imgtec.com>

5 months, 1 week

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