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[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

6 days, 2 hours

(no subject)

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by Alex Morgan

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by Alex Morgan

6 days, 7 hours

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by Chong Criston

6 days, 17 hours

[PATCH v2] dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning

by Mikhail Gavrilov

When CONFIG_DMA_API_DEBUG_SG is enabled, importing a udmabuf into a DRM driver (e.g. amdgpu for video playback in GNOME Videos / Showtime) triggers a spurious warning: DMA-API: amdgpu 0000:03:00.0: cacheline tracking EEXIST, \ overlapping mappings aren't supported WARNING: kernel/dma/debug.c:619 at add_dma_entry+0x473/0x5f0 The call chain is: amdgpu_cs_ioctl -> amdgpu_ttm_backend_bind -> dma_buf_map_attachment -> [udmabuf] map_udmabuf -> get_sg_table -> dma_map_sgtable(dev, sg, direction, 0) // attrs=0 -> debug_dma_map_sg -> add_dma_entry -> EEXIST This happens because udmabuf builds a per-page scatter-gather list via sg_set_folio(). When begin_cpu_udmabuf() has already created an sg table mapped for the misc device, and an importer such as amdgpu maps the same pages for its own device via map_udmabuf(), the DMA debug infrastructure sees two active mappings whose physical addresses share cacheline boundaries and warns about the overlap. The DMA_ATTR_SKIP_CPU_SYNC flag suppresses this check in add_dma_entry() because it signals that no CPU cache maintenance is performed at map/unmap time, making the cacheline overlap harmless. All other major dma-buf exporters already pass this flag: - drm_gem_map_dma_buf() passes DMA_ATTR_SKIP_CPU_SYNC - amdgpu_dma_buf_map() passes DMA_ATTR_SKIP_CPU_SYNC The CPU sync at map/unmap time is also redundant for udmabuf: begin_cpu_udmabuf() and end_cpu_udmabuf() already perform explicit cache synchronization via dma_sync_sgtable_for_cpu/device() when CPU access is requested through the dma-buf interface. Pass DMA_ATTR_SKIP_CPU_SYNC to dma_map_sgtable() and dma_unmap_sgtable() in udmabuf to suppress the spurious warning and skip the redundant sync. Fixes: 284562e1f348 ("udmabuf: implement begin_cpu_access/end_cpu_access hooks") Cc: stable(a)vger.kernel.org Signed-off-by: Mikhail Gavrilov <mikhail.v.gavrilov(a)gmail.com> --- v1 -> v2: - Rebased on drm-tip to resolve conflict with folio conversion patches. No code change, same two-line fix. v1: https://lore.kernel.org/all/20260317053653.28888-1-mikhail.v.gavrilov@gmail… drivers/dma-buf/udmabuf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index 94b26ea706a3..bced421c0d65 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -145,7 +145,7 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, if (ret < 0) goto err_alloc; - ret = dma_map_sgtable(dev, sg, direction, 0); + ret = dma_map_sgtable(dev, sg, direction, DMA_ATTR_SKIP_CPU_SYNC); if (ret < 0) goto err_map; return sg; @@ -160,7 +160,7 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, static void put_sg_table(struct device *dev, struct sg_table *sg, enum dma_data_direction direction) { - dma_unmap_sgtable(dev, sg, direction, 0); + dma_unmap_sgtable(dev, sg, direction, DMA_ATTR_SKIP_CPU_SYNC); sg_free_table(sg); kfree(sg); } -- 2.53.0

1 week

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Dub Hub: Steve Kerr thinks

by MurasakiDeiivi＠gmail.com

Brandin Podziemski is trying in direction of do much too much , making it possible for an uncontested physical appearance in direction of Utah's secondleading , who completed with 6 details within just a seasonlow 18 minutes, didn't perform the minute quarter as the Warriors blew the recreation open up with a 4120 toward reporters the moment Tuesday's train, Kerr claimed the thirdyear secure's present struggles stem towards trying toward do much too a lot.Through 18 video games, Podziemski is averaging 12.4 information upon 43.8% capturing, such as 37.9% against 3 and 77.8% at the freethrow consists of been powerful as the staff's secondary ballhandler powering Stephen Curry, still as Kerr notes, the Warriors wear't want even more towards Podziemski upon utmost ambition is there, still he's at his most straightforward Even though he leans into the job that enhances the veteran far more upon this and other information in the vicinity of the NBA, in this article is our newest information roundup for Wednesday, November 26th:Warriors Information:Warriors employ train toward lean into gameplan self-control right before Rockets showdown NBC Sporting activities Bay AreaSo, the Warriors, upon Tuesday, viewed movie of their 1347 victory that was manufactured upon the corrective motion taken around the supreme a few muted the Jazz within just the moment quarter, with a 4120 comfort, and rode the momentum toward a rout.What I observed as that very first quarter went upon was a absence of notice defensively, within just words and phrases of being familiar with the sport application, making an attempt in the direction of acquire out George and Markkanen and extremely be targeted upon them, ?Kerr mentioned soon after video clip evaluation and prepare at Chase Centre.And we make it possible for George attain 4 open up 3s in just the initial quarter.Warriors' Jonathan Kuminga toward be part of 5upon5 scrimmage, return even now unclear The AthleticKerr, who is made up of sounded annoyed within existing times When speaking about the deficiency of clarity close to Kuminga's reputation, supplied a sure enhance regarding the 23yearold just after Tuesday's train.He did threeonthree right before train, ?Kerr reported.And that went very then he took portion inside of all of he will gained't enjoy within just the video game Wednesday, nonetheless he will choose element within a fiveonfive scrimmage Wednesday night time just before our sport, and that will Deliver us a optimistic gauge for where by he is.Steph Curry discusses the thing to consider course of action guiding his shoe alternative as a refreshing sneaker no cost agentNBA Information:Where by just about every personnel stands throughout best 7 days of Community Engage in NBAThe Emirates NBA Cup includes accomplished the best 7 days of Local community Perform with 20 video games still left in the direction of Compute the 8 groups that will progress in the direction of the Knockout organized for the motion Wednesday upon ESPN, and a greatest video game Friday upon Best Video clip and League will progress in the direction of the Knockout Rounds? 8 areas are accessible.6 will transfer towards the winners of each individual supreme 2 wild card?areas will be the groups in opposition to every single convention with the ideal data within just Neighborhood Enjoy game titles who carried out moment inside their Suggs ejected just after scuffle through Magic76ers gameIn scenario yourself forgotten it at Golden Nation of Thoughts:How Jimmy Butler's manufacturer of isolation basketball fosters collectivismWhile simply just 5.6% of the Warriors' offensive belongings contain an isolation series 18th within the league it's a obvious uptick versus a time back, inside which 5% of their belongings had been isolations, 26th in just the the meantime, postup belongings on top of that professional a minimal uptick: against 2.3% very last time 22nd in direction of 3% this period Butler and his manufacturer of offense is made up of definitely performed a section guiding all those quantities https://www.goldenstatefanstore.com/collections/seth-curry-jersey, a option that is made up of tested in direction of be an thriving a person primarily based upon performance just 128 merged isolation and postup belongings amongst Butler which includes all those that conclusion within just a teammate getting a shot generate or neglected, freethrows, or turning the ball above the Warriors are scoring 1.047 information for every ownership, for each Synergy by unstoppablebaby upon X for all the hottest information upon the Golden Place Warriors. https://www.goldenstatefanstore.com Sitemap

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