Linaro-mm-sig

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24 participants
6307 discussions

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6 hours, 45 minutes

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by joelwest689＠gmail.com

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15 hours, 40 minutes

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

by Christian König

On 4/9/26 14:38, Andi Shyti wrote: > Hi Christian, > >> @@ -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); > > funny, I just found out I sent the exact same patch, just few > minutes later :-) [*] I liked your patch better since it has more accurate tags. Just reviewed and pushed that one to drm-misc-fixes, should land upstream by the end of the week. Regards, Christian. > > Andi > >> } > > [*] https://lore.kernel.org/all/20260408123916.2604101-2-andi.shyti@kernel.org/

17 hours, 4 minutes

Re: [PATCH RFC 12/26] vfio/pci: Change the DMA-buf exporter to use mapping_type

by Jason Gunthorpe

On Mon, Apr 13, 2026 at 04:29:59PM +0800, Baolu Lu wrote: > On 2/18/26 08:11, Jason Gunthorpe wrote: > > Simple conversion to add a match_mapping() callback that offers an > > exporter SGT mapping type. Later patches will add a physical address > > exporter so go straight to adding the match_mapping() function. > > > > The check for attachment->peer2peer is replaced with setting > > exporter_requires_p2p=true. VFIO always uses MMIO memory. > > > > Signed-off-by: Jason Gunthorpe <jgg(a)nvidia.com> > > --- > > drivers/vfio/pci/vfio_pci_dmabuf.c | 31 +++++++++++++++++++++++++----- > > 1 file changed, 26 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c > > index d4d0f7d08c53e2..c7addef5794abf 100644 > > --- a/drivers/vfio/pci/vfio_pci_dmabuf.c > > +++ b/drivers/vfio/pci/vfio_pci_dmabuf.c > > @@ -25,9 +25,6 @@ static int vfio_pci_dma_buf_attach(struct dma_buf *dmabuf, > > { > > struct vfio_pci_dma_buf *priv = dmabuf->priv; > > - if (!attachment->peer2peer) > > - return -EOPNOTSUPP; > > - > > if (priv->revoked) > > return -ENODEV; > > @@ -75,11 +72,35 @@ static void vfio_pci_dma_buf_release(struct dma_buf *dmabuf) > > kfree(priv); > > } > > -static const struct dma_buf_ops vfio_pci_dmabuf_ops = { > > - .attach = vfio_pci_dma_buf_attach, > > +static const struct dma_buf_mapping_sgt_exp_ops vfio_pci_dma_buf_sgt_ops = { > > .map_dma_buf = vfio_pci_dma_buf_map, > > .unmap_dma_buf = vfio_pci_dma_buf_unmap, > > +}; > > + > > +static int vfio_pci_dma_buf_match_mapping(struct dma_buf_match_args *args) > > +{ > > + struct vfio_pci_dma_buf *priv = args->dmabuf->priv; > > + struct dma_buf_mapping_match sgt_match[1]; > > + > > + dma_resv_assert_held(priv->dmabuf->resv); > > My understanding of this lock assertion is that priv and the underlying > priv->vdev are accessed within this function. Therefore, the lock is > necessary to protect them. Do I understand it right? It is because we NULL priv->vdev on the cleanup path I'm not sure why my test kernel didn't hit lockdep failures but yes this looks incorrect. > However, callers - for example, dma_buf_mapping_attach() - do not > acquire dma_resv_lock() before calling this function. So kernel traces > will always be triggered. I think this is the fix: diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c index 9e7e8e7719d1bd..3e31ffb03ddd9a 100644 --- a/drivers/vfio/pci/vfio_pci_dmabuf.c +++ b/drivers/vfio/pci/vfio_pci_dmabuf.c @@ -12,6 +12,7 @@ MODULE_IMPORT_NS("DMA_BUF"); struct vfio_pci_dma_buf { struct dma_buf *dmabuf; struct vfio_pci_core_device *vdev; + struct pci_dev *pdev; struct list_head dmabufs_elm; size_t size; struct phys_vec *phys_vec; @@ -92,6 +93,7 @@ static void vfio_pci_dma_buf_release(struct dma_buf *dmabuf) up_write(&priv->vdev->memory_lock); vfio_device_put_registration(&priv->vdev->vdev); } + pci_dev_put(priv->pdev); kfree(priv->phys_vec); kfree(priv); } @@ -143,18 +145,9 @@ static int vfio_pci_dma_buf_match_mapping(struct dma_buf_match_args *args) struct vfio_pci_dma_buf *priv = args->dmabuf->priv; struct dma_buf_mapping_match sgt_match[2]; - dma_resv_assert_held(priv->dmabuf->resv); - - /* - * Once we pass vfio_pci_dma_buf_cleanup() the dmabuf will never be - * usable again. - */ - if (!priv->vdev) - return -ENODEV; - sgt_match[0] = DMA_BUF_EMAPPING_PAL(&vfio_pci_dma_buf_pal_ops); sgt_match[1] = DMA_BUF_EMAPPING_SGT_P2P(&vfio_pci_dma_buf_sgt_ops, - priv->vdev->pdev); + priv->pdev); return dma_buf_match_mapping(args, sgt_match, ARRAY_SIZE(sgt_match)); } @@ -323,6 +316,7 @@ int vfio_pci_core_feature_dma_buf(struct vfio_pci_core_device *vdev, u32 flags, goto err_dev_put; } + priv->pdev = pci_dev_get(vdev->pdev); kref_init(&priv->kref); init_completion(&priv->comp);

18 hours, 3 minutes

[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

18 hours, 48 minutes

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

by Maíra Canal

Hi Philipp, On 4/13/26 03:47, Philipp Stanner wrote: > On Sat, 2026-04-11 at 15:47 -0300, Maíra Canal wrote: >> 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. > > Yes, 100%. > That's one of the reasons why Christian recently moved to using inline- > locks. > > > >> 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. > > I would probably delete the explanation altogether and just state > "allowed for legacy reasons". The legacy people know why it's allowed, > and new users don't need to care. Same below of course. Actually, I ended up in this part of the documentation as I'm thinking about dropping the external lock in v3d driver. I was reading the docs exactly to know if v3d is a legacy use case (spoiler: it isn't) and I got confused by the current wording. So, I think there is value in documenting the legacy use cases for the external lock. Maybe, instead of "strongly discouraged", we could add a disclaimer like: "New drivers MUST NOT use an external lock because...". What do you think? Best regards, - Maíra > > > Thx > P. > >> */ >> 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, >

19 hours, 5 minutes

Re: [PATCH 2/3] dma-fence: Fix potential tracepoint null pointer dereferences

by Christian König

On 4/13/26 12:05, Tvrtko Ursulin wrote: > Trace_dma_fence_signaled, trace_dma_fence_wait_end and > trace_dma_fence_destroy can all dereference a null fence->ops pointer > after it has been reset on fence signalling. > > Lets use the safe string getters for most tracepoints to a void this. > > But for the signalling tracepoint, we move it to before the fence->ops > is reset and special case its definition in order to avoid losing the > driver and timeline information. > > 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 ++- > include/trace/events/dma_fence.h | 29 +++++++++++++++++++++++++++-- > 2 files changed, 29 insertions(+), 3 deletions(-) > > diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c > index a2aa82f4eedd..b3bfa6943a8e 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); > diff --git a/include/trace/events/dma_fence.h b/include/trace/events/dma_fence.h > index 3abba45c0601..220bf71446e8 100644 > --- a/include/trace/events/dma_fence.h > +++ b/include/trace/events/dma_fence.h > @@ -9,12 +9,37 @@ > > struct dma_fence; > > +DECLARE_EVENT_CLASS(dma_fence, > + > + TP_PROTO(struct dma_fence *fence), > + > + TP_ARGS(fence), > + > + TP_STRUCT__entry( > + __string(driver, dma_fence_driver_name(fence)) > + __string(timeline, dma_fence_timeline_name(fence)) That requires that we hold the RCU read side lock while doing the trace. Not sure if that can be done inside the DECLARE_EVENT_CLASS() macro. > + __field(unsigned int, context) > + __field(unsigned int, seqno) > + ), > + > + TP_fast_assign( > + __assign_str(driver); > + __assign_str(timeline); > + __entry->context = fence->context; > + __entry->seqno = fence->seqno; > + ), > + > + TP_printk("driver=%s timeline=%s context=%u seqno=%u", > + __get_str(driver), __get_str(timeline), __entry->context, > + __entry->seqno) > +); > + > /* > * Safe only for call sites which are guaranteed to not race with fence > * signaling,holding the fence->lock and having checked for not signaled, or the > * signaling path itself. > */ > -DECLARE_EVENT_CLASS(dma_fence, > +DECLARE_EVENT_CLASS(dma_fence_ops, > > TP_PROTO(struct dma_fence *fence), > > @@ -67,7 +92,7 @@ DEFINE_EVENT(dma_fence, dma_fence_enable_signal, > TP_ARGS(fence) > ); > > -DEFINE_EVENT(dma_fence, dma_fence_signaled, > +DEFINE_EVENT(dma_fence_ops, dma_fence_signaled, The signal trace event is actually unproblematic. The question is more what to do with the release event. Regards, Christian. > > TP_PROTO(struct dma_fence *fence), >

19 hours, 32 minutes

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

by Christian König

On 4/10/26 17:37, Tvrtko Ursulin wrote: > > On 10/04/2026 09:58, Christian König wrote: >> On 4/9/26 15:58, Tvrtko Ursulin wrote: >>> >>> On 31/03/2026 08:49, Boris Brezillon wrote: >>>> On Mon, 30 Mar 2026 14:36:23 +0100 >>>> Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> wrote: >>>> >>>>> Move the signalling tracepoint to before fence->ops are reset otherwise >>>>> tracepoint will dereference a null pointer. >>>> >>>> I suspect other trace points are impacted too >>>> (trace_dma_fence_destroy() is, at the very least). >>> >>> Indeed. I wonder why that did not trigger for me, while the one I fix here was an insta-crash... >> >> You need to actually enable the trace points and at least for the destroy one nobody is usually interested in that. > > Right, but I was pretty sure I was enabling perf record -e 'dma_fence:*' when I hit this. Anyway, it doesn't matter, I could be misremembering. > >>> >>> To fix trace_dma_fence_destroy I think we need a new tracepoint definition ie. move it away from the existing event class - make it just log the context and seqno. >>> >>> Anyone has a better idea? >> >> The idea of tracing without accessing fence->ops sounds valid to me. >> >> Alternatively we could call dma_fence_timeline_name() and dma_fence_driver_name() from the tracepoint as well, but that means the tracepoints now require a RCU read side lock. > > We could possibly use the helpers. I am not sure if RCU annotation would have to be casted away to keep sparse happy, but more importantly, I think it would not be safe. > > thread A thread B > > dma_fence_signal_timestamp_locked dma_fence_timeline_name > .. ops = rcu_dereference(fence->ops); > if (!dma_fence_test_signaled_flag(fence)) > test_and_set_bit > .. > RCU_INIT_POINTER(fence->ops, NULL); > return (const char __rcu *)ops->get_driver_name(fence); // OOPS! > > Apologies for long line length, it did not fit otherwise. > > Looks like we missed this. Or it is me who is missing something? See function dma_fence_driver_name() and dma_fence_timeline_name(): ops = rcu_dereference(fence->ops); if (!dma_fence_test_signaled_flag(fence)) return (const char __rcu *)ops->get_driver_name(fence); We first grab the ops pointer and then check if the fence is signaled or not. Since we first set the signaled flag and then NULL the ops pointer in the other thread we should be save here. Could only be that test_bit() is not a memory barrier, but set_bit() is so that would be a bit surprising. Alternatively I would be fine to switching testing ops for NULL instead of calling dma_fence_test_signaled_flag(). Regards, Christian. > Regards, > > Tvrtko > >>>>> 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); >>>> >>> >> >

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