Linaro-mm-sig March 2025

linaro-mm-sig@lists.linaro.org

16 participants
38 discussions

Re: [PATCH 1/7] drm/shmem-helper: Add lockdep asserts to vmap/vunmap

by Christian König

Am 18.03.25 um 20:22 schrieb Daniel Almeida: > From: Asahi Lina <lina(a)asahilina.net> > > Since commit 21aa27ddc582 ("drm/shmem-helper: Switch to reservation > lock"), the drm_gem_shmem_vmap and drm_gem_shmem_vunmap functions > require that the caller holds the DMA reservation lock for the object. > Add lockdep assertions to help validate this. > > Signed-off-by: Asahi Lina <lina(a)asahilina.net> > Signed-off-by: Daniel Almeida <daniel.almeida(a)collabora.com> Oh, yeah that is certainly a good idea. Reviewed-by: Christian König <christian.koenig(a)amd.com> > --- > drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c > index 5ab351409312b5a0de542df2b636278d6186cb7b..ec89e9499f5f02a2a35713669bf649dd2abb9938 100644 > --- a/drivers/gpu/drm/drm_gem_shmem_helper.c > +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c > @@ -338,6 +338,8 @@ int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem, > struct drm_gem_object *obj = &shmem->base; > int ret = 0; > > + dma_resv_assert_held(obj->resv); > + > if (obj->import_attach) { > ret = dma_buf_vmap(obj->import_attach->dmabuf, map); > if (!ret) { > @@ -404,6 +406,8 @@ void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem, > { > struct drm_gem_object *obj = &shmem->base; > > + dma_resv_assert_held(obj->resv); > + > if (obj->import_attach) { > dma_buf_vunmap(obj->import_attach->dmabuf, map); > } else { >

1 month, 2 weeks

[PATCH RFC 00/12] dma: Enable dmem cgroup tracking

by Maxime Ripard

Hi, Here's preliminary work to enable dmem tracking for heavy users of DMA allocations on behalf of userspace: v4l2, DRM, and dma-buf heaps. It's not really meant for inclusion at the moment, because I really don't like it that much, and would like to discuss solutions on how to make it nicer. In particular, the dma dmem region accessors don't feel that great to me. It duplicates the logic to select the proper accessor in dma_alloc_attrs(), and it looks fragile and potentially buggy to me. One solution I tried is to do the accounting in dma_alloc_attrs() directly, depending on a flag being set, similar to what __GFP_ACCOUNT is doing. It didn't work because dmem initialises a state pointer when charging an allocation to a region, and expects that state pointer to be passed back when uncharging. Since dma_alloc_attrs() returns a void pointer to the allocated buffer, we need to put that state into a higher-level structure, such as drm_gem_object, or dma_buf. Since we can't share the region selection logic, we need to get the region through some other mean. Another thing I consider was to return the region as part of the allocated buffer (through struct page or folio), but those are lost across the calls and dma_alloc_attrs() will only get a void pointer. So that's not doable without some heavy rework, if it's a good idea at all. So yeah, I went for the dumbest possible solution with the accessors, hoping you could suggest a much smarter idea :) Thanks, Maxime Signed-off-by: Maxime Ripard <mripard(a)kernel.org> --- Maxime Ripard (12): cma: Register dmem region for each cma region cma: Provide accessor to cma dmem region dma: coherent: Register dmem region for each coherent region dma: coherent: Provide accessor to dmem region dma: contiguous: Provide accessor to dmem region dma: direct: Provide accessor to dmem region dma: Create default dmem region for DMA allocations dma: Provide accessor to dmem region dma-buf: Clear cgroup accounting on release dma-buf: cma: Account for allocations in dmem cgroup drm/gem: Add cgroup memory accounting media: videobuf2: Track buffer allocations through the dmem cgroup drivers/dma-buf/dma-buf.c | 7 ++++ drivers/dma-buf/heaps/cma_heap.c | 18 ++++++++-- drivers/gpu/drm/drm_gem.c | 5 +++ drivers/gpu/drm/drm_gem_dma_helper.c | 6 ++++ .../media/common/videobuf2/videobuf2-dma-contig.c | 19 +++++++++++ include/drm/drm_device.h | 1 + include/drm/drm_gem.h | 2 ++ include/linux/cma.h | 9 +++++ include/linux/dma-buf.h | 5 +++ include/linux/dma-direct.h | 2 ++ include/linux/dma-map-ops.h | 32 ++++++++++++++++++ include/linux/dma-mapping.h | 11 ++++++ kernel/dma/coherent.c | 26 +++++++++++++++ kernel/dma/direct.c | 8 +++++ kernel/dma/mapping.c | 39 ++++++++++++++++++++++ mm/cma.c | 21 +++++++++++- mm/cma.h | 3 ++ 17 files changed, 211 insertions(+), 3 deletions(-) --- base-commit: 55a2aa61ba59c138bd956afe0376ec412a7004cf change-id: 20250307-dmem-cgroups-73febced0989 Best regards, -- Maxime Ripard <mripard(a)kernel.org>

2 months, 3 weeks

[PATCH] dma-buf/sw_sync: Decrement refcount on error in sw_sync_ioctl_get_deadline()

by Dan Carpenter

Call dma_fence_put(fence) before returning an error on this error path. Fixes: 70e67aaec2f4 ("dma-buf/sw_sync: Add fence deadline support") Signed-off-by: Dan Carpenter <dan.carpenter(a)linaro.org> --- drivers/dma-buf/sw_sync.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c index f5905d67dedb..b7615c5c6cac 100644 --- a/drivers/dma-buf/sw_sync.c +++ b/drivers/dma-buf/sw_sync.c @@ -438,8 +438,10 @@ static int sw_sync_ioctl_get_deadline(struct sync_timeline *obj, unsigned long a return -EINVAL; pt = dma_fence_to_sync_pt(fence); - if (!pt) + if (!pt) { + dma_fence_put(fence); return -EINVAL; + } spin_lock_irqsave(fence->lock, flags); if (test_bit(SW_SYNC_HAS_DEADLINE_BIT, &fence->flags)) { -- 2.47.2

2 months, 3 weeks

[PATCH v5] drm/syncobj: Extend EXPORT_SYNC_FILE for timeline syncobjs

by Rob Clark

From: Rob Clark <robdclark(a)chromium.org> Add support for exporting a dma_fence fd for a specific point on a timeline. This is needed for vtest/vpipe[1][2] to implement timeline syncobj support, as it needs a way to turn a point on a timeline back into a dma_fence fd. It also closes an odd omission from the syncobj UAPI. [1] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33433 [2] https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/805 v2: Add DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE v3: Add unstaged uabi header hunk v4: Also handle IMPORT_SYNC_FILE case v5: Address comments from Dmitry Signed-off-by: Rob Clark <robdclark(a)chromium.org> --- drivers/gpu/drm/drm_syncobj.c | 45 +++++++++++++++++++++++++++-------- include/uapi/drm/drm.h | 4 ++++ 2 files changed, 39 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c index 4f2ab8a7b50f..b0a4c58fe726 100644 --- a/drivers/gpu/drm/drm_syncobj.c +++ b/drivers/gpu/drm/drm_syncobj.c @@ -741,7 +741,7 @@ static int drm_syncobj_fd_to_handle(struct drm_file *file_private, } static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private, - int fd, int handle) + int fd, int handle, u64 point) { struct dma_fence *fence = sync_file_get_fence(fd); struct drm_syncobj *syncobj; @@ -755,14 +755,22 @@ static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private, return -ENOENT; } - drm_syncobj_replace_fence(syncobj, fence); + if (point) { + struct dma_fence_chain *chain = dma_fence_chain_alloc(); + if (!chain) + return -ENOMEM; + drm_syncobj_add_point(syncobj, chain, fence, point); + } else { + drm_syncobj_replace_fence(syncobj, fence); + } + dma_fence_put(fence); drm_syncobj_put(syncobj); return 0; } static int drm_syncobj_export_sync_file(struct drm_file *file_private, - int handle, int *p_fd) + int handle, u64 point, int *p_fd) { int ret; struct dma_fence *fence; @@ -772,7 +780,7 @@ static int drm_syncobj_export_sync_file(struct drm_file *file_private, if (fd < 0) return fd; - ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence); + ret = drm_syncobj_find_fence(file_private, handle, point, 0, &fence); if (ret) goto err_put_fd; @@ -869,6 +877,9 @@ drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data, struct drm_file *file_private) { struct drm_syncobj_handle *args = data; + unsigned valid_flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE | + DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE; + u64 point = 0; if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) return -EOPNOTSUPP; @@ -876,13 +887,18 @@ drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data, if (args->pad) return -EINVAL; - if (args->flags != 0 && - args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) + if (args->flags & ~valid_flags) return -EINVAL; + if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE) + point = args->point; + if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) return drm_syncobj_export_sync_file(file_private, args->handle, - &args->fd); + point, &args->fd); + + if (args->point) + return -EINVAL; return drm_syncobj_handle_to_fd(file_private, args->handle, &args->fd); @@ -893,6 +909,9 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data, struct drm_file *file_private) { struct drm_syncobj_handle *args = data; + unsigned valid_flags = DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_TIMELINE | + DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE; + u64 point = 0; if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) return -EOPNOTSUPP; @@ -900,14 +919,20 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data, if (args->pad) return -EINVAL; - if (args->flags != 0 && - args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) + if (args->flags & ~valid_flags) return -EINVAL; + if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_TIMELINE) + point = args->point; + if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) return drm_syncobj_import_sync_file_fence(file_private, args->fd, - args->handle); + args->handle, + point); + + if (args->point) + return -EINVAL; return drm_syncobj_fd_to_handle(file_private, args->fd, &args->handle); diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h index 7fba37b94401..e63a71d3c607 100644 --- a/include/uapi/drm/drm.h +++ b/include/uapi/drm/drm.h @@ -905,13 +905,17 @@ struct drm_syncobj_destroy { }; #define DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE (1 << 0) +#define DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_TIMELINE (1 << 1) #define DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE (1 << 0) +#define DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE (1 << 1) struct drm_syncobj_handle { __u32 handle; __u32 flags; __s32 fd; __u32 pad; + + __u64 point; }; struct drm_syncobj_transfer { -- 2.49.0

3 months

Re: [PATCH v3 03/11] tee: add TEE_IOCTL_PARAM_ATTR_TYPE_UBUF

by kernel test robot

Hi Amirreza, kernel test robot noticed the following build warnings: [auto build test WARNING on db8da9da41bced445077925f8a886c776a47440c] url: https://github.com/intel-lab-lkp/linux/commits/Amirreza-Zarrabi/tee-allow-a… base: db8da9da41bced445077925f8a886c776a47440c patch link: https://lore.kernel.org/r/20250327-qcom-tee-using-tee-ss-without-mem-obj-v3… patch subject: [PATCH v3 03/11] tee: add TEE_IOCTL_PARAM_ATTR_TYPE_UBUF config: x86_64-randconfig-122-20250329 (https://download.01.org/0day-ci/archive/20250329/202503291204.imMRd3l7-lkp@…) compiler: clang version 20.1.1 (https://github.com/llvm/llvm-project 424c2d9b7e4de40d0804dd374721e6411c27d1d1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250329/202503291204.imMRd3l7-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202503291204.imMRd3l7-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) >> drivers/tee/tee_core.c:410:48: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected void *[noderef] uaddr @@ got void [noderef] __user * @@ drivers/tee/tee_core.c:410:48: sparse: expected void *[noderef] uaddr drivers/tee/tee_core.c:410:48: sparse: got void [noderef] __user * >> drivers/tee/tee_core.c:413:30: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __user *ptr @@ got void *[noderef] uaddr @@ drivers/tee/tee_core.c:413:30: sparse: expected void const [noderef] __user *ptr drivers/tee/tee_core.c:413:30: sparse: got void *[noderef] uaddr drivers/tee/tee_core.c:802:41: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected void *[noderef] uaddr @@ got void [noderef] __user * @@ drivers/tee/tee_core.c:802:41: sparse: expected void *[noderef] uaddr drivers/tee/tee_core.c:802:41: sparse: got void [noderef] __user * drivers/tee/tee_core.c:805:30: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const [noderef] __user *ptr @@ got void *[noderef] uaddr @@ drivers/tee/tee_core.c:805:30: sparse: expected void const [noderef] __user *ptr drivers/tee/tee_core.c:805:30: sparse: got void *[noderef] uaddr >> drivers/tee/tee_core.c:413:30: sparse: sparse: dereference of noderef expression >> drivers/tee/tee_core.c:413:30: sparse: sparse: dereference of noderef expression drivers/tee/tee_core.c:694:37: sparse: sparse: dereference of noderef expression drivers/tee/tee_core.c:805:30: sparse: sparse: dereference of noderef expression drivers/tee/tee_core.c:805:30: sparse: sparse: dereference of noderef expression vim +410 drivers/tee/tee_core.c 378 379 static int params_from_user(struct tee_context *ctx, struct tee_param *params, 380 size_t num_params, 381 struct tee_ioctl_param __user *uparams) 382 { 383 size_t n; 384 385 for (n = 0; n < num_params; n++) { 386 struct tee_shm *shm; 387 struct tee_ioctl_param ip; 388 389 if (copy_from_user(&ip, uparams + n, sizeof(ip))) 390 return -EFAULT; 391 392 /* All unused attribute bits has to be zero */ 393 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK) 394 return -EINVAL; 395 396 params[n].attr = ip.attr; 397 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) { 398 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE: 399 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT: 400 break; 401 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT: 402 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT: 403 params[n].u.value.a = ip.a; 404 params[n].u.value.b = ip.b; 405 params[n].u.value.c = ip.c; 406 break; 407 case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT: 408 case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT: 409 case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INOUT: > 410 params[n].u.ubuf.uaddr = u64_to_user_ptr(ip.a); 411 params[n].u.ubuf.size = ip.b; 412 > 413 if (!access_ok(params[n].u.ubuf.uaddr, 414 params[n].u.ubuf.size)) 415 return -EFAULT; 416 417 break; 418 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT: 419 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: 420 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT: 421 /* 422 * If a NULL pointer is passed to a TA in the TEE, 423 * the ip.c IOCTL parameters is set to TEE_MEMREF_NULL 424 * indicating a NULL memory reference. 425 */ 426 if (ip.c != TEE_MEMREF_NULL) { 427 /* 428 * If we fail to get a pointer to a shared 429 * memory object (and increase the ref count) 430 * from an identifier we return an error. All 431 * pointers that has been added in params have 432 * an increased ref count. It's the callers 433 * responibility to do tee_shm_put() on all 434 * resolved pointers. 435 */ 436 shm = tee_shm_get_from_id(ctx, ip.c); 437 if (IS_ERR(shm)) 438 return PTR_ERR(shm); 439 440 /* 441 * Ensure offset + size does not overflow 442 * offset and does not overflow the size of 443 * the referred shared memory object. 444 */ 445 if ((ip.a + ip.b) < ip.a || 446 (ip.a + ip.b) > shm->size) { 447 tee_shm_put(shm); 448 return -EINVAL; 449 } 450 } else if (ctx->cap_memref_null) { 451 /* Pass NULL pointer to OP-TEE */ 452 shm = NULL; 453 } else { 454 return -EINVAL; 455 } 456 457 params[n].u.memref.shm_offs = ip.a; 458 params[n].u.memref.size = ip.b; 459 params[n].u.memref.shm = shm; 460 break; 461 default: 462 /* Unknown attribute */ 463 return -EINVAL; 464 } 465 } 466 return 0; 467 } 468 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

3 months

Re: [PATCH v3 08/11] tee: add Qualcomm TEE driver

by kernel test robot

3 months

[PATCH v4] drm/syncobj: Extend EXPORT_SYNC_FILE for timeline syncobjs

by Rob Clark

From: Rob Clark <robdclark(a)chromium.org> Add support for exporting a dma_fence fd for a specific point on a timeline. This is needed for vtest/vpipe[1][2] to implement timeline syncobj support, as it needs a way to turn a point on a timeline back into a dma_fence fd. It also closes an odd omission from the syncobj UAPI. [1] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33433 [2] https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/805 v2: Add DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE v3: Add unstaged uabi header hunk v4: Also handle IMPORT_SYNC_FILE case Signed-off-by: Rob Clark <robdclark(a)chromium.org> --- drivers/gpu/drm/drm_syncobj.c | 41 ++++++++++++++++++++++++++--------- include/uapi/drm/drm.h | 4 ++++ 2 files changed, 35 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c index 4f2ab8a7b50f..58d8a9035f7d 100644 --- a/drivers/gpu/drm/drm_syncobj.c +++ b/drivers/gpu/drm/drm_syncobj.c @@ -741,7 +741,7 @@ static int drm_syncobj_fd_to_handle(struct drm_file *file_private, } static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private, - int fd, int handle) + int fd, int handle, u64 point) { struct dma_fence *fence = sync_file_get_fence(fd); struct drm_syncobj *syncobj; @@ -755,14 +755,18 @@ static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private, return -ENOENT; } - drm_syncobj_replace_fence(syncobj, fence); + if (point) { + drm_syncobj_add_point(syncobj, dma_fence_chain_alloc(), fence, point); + } else { + drm_syncobj_replace_fence(syncobj, fence); + } dma_fence_put(fence); drm_syncobj_put(syncobj); return 0; } static int drm_syncobj_export_sync_file(struct drm_file *file_private, - int handle, int *p_fd) + int handle, u64 point, int *p_fd) { int ret; struct dma_fence *fence; @@ -772,7 +776,7 @@ static int drm_syncobj_export_sync_file(struct drm_file *file_private, if (fd < 0) return fd; - ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence); + ret = drm_syncobj_find_fence(file_private, handle, point, 0, &fence); if (ret) goto err_put_fd; @@ -869,6 +873,9 @@ drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data, struct drm_file *file_private) { struct drm_syncobj_handle *args = data; + unsigned valid_flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE | + DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE; + u64 point = 0; if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) return -EOPNOTSUPP; @@ -876,13 +883,18 @@ drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data, if (args->pad) return -EINVAL; - if (args->flags != 0 && - args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) + if (args->flags != 0 && (args->flags & ~valid_flags)) return -EINVAL; + if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE) + point = args->point; + if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) return drm_syncobj_export_sync_file(file_private, args->handle, - &args->fd); + point, &args->fd); + + if (args->point) + return -EINVAL; return drm_syncobj_handle_to_fd(file_private, args->handle, &args->fd); @@ -893,6 +905,9 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data, struct drm_file *file_private) { struct drm_syncobj_handle *args = data; + unsigned valid_flags = DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_TIMELINE | + DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE; + u64 point = 0; if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) return -EOPNOTSUPP; @@ -900,14 +915,20 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data, if (args->pad) return -EINVAL; - if (args->flags != 0 && - args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) + if (args->flags != 0 && (args->flags & ~valid_flags)) return -EINVAL; + if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_TIMELINE) + point = args->point; + if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) return drm_syncobj_import_sync_file_fence(file_private, args->fd, - args->handle); + args->handle, + point); + + if (args->point) + return -EINVAL; return drm_syncobj_fd_to_handle(file_private, args->fd, &args->handle); diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h index 7fba37b94401..e63a71d3c607 100644 --- a/include/uapi/drm/drm.h +++ b/include/uapi/drm/drm.h @@ -905,13 +905,17 @@ struct drm_syncobj_destroy { }; #define DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE (1 << 0) +#define DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_TIMELINE (1 << 1) #define DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE (1 << 0) +#define DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_TIMELINE (1 << 1) struct drm_syncobj_handle { __u32 handle; __u32 flags; __s32 fd; __u32 pad; + + __u64 point; }; struct drm_syncobj_transfer { -- 2.49.0

3 months

[PATCH v3] drm/syncobj: Extend EXPORT_SYNC_FILE for timeline syncobjs

by Rob Clark

3 months

[PATCH v2] drm/syncobj: Extend EXPORT_SYNC_FILE for timeline syncobjs

by Rob Clark

3 months

Re: [PATCH] drm/nouveau: Prevent signalled fences in pending list

by Christian König

Am 27.03.25 um 09:42 schrieb Philipp Stanner: > Nouveau currently relies on the assumption that dma_fences will only > ever get signalled through nouveau_fence_signal(), which takes care of > removing a signalled fence from the list nouveau_fence_chan.pending. > > This self-imposed rule is violated in nouveau_fence_done(), where > dma_fence_is_signaled() can signal the fence without removing it from > the list. This enables accesses to already signalled fences through the > list, which is a bug. > > Furthermore, it must always be possible to use standard dma_fence > methods an a dma_fence and observe valid behavior. The canonical way of > ensuring that signalling a fence has additional effects is to add those > effects to a callback and register it on the fence. Good catch. > > Move the code from nouveau_fence_signal() into a dma_fence callback. > Register that callback when creating the fence. But that's a really ugly approach. Either nouveau shouldn't implement the signaled callback or make sure that when returning true from the signaled callback the fence is also removed from the pending list. > > Cc: <stable(a)vger.kernel.org> # 4.10+ > Fixes: f54d1867005c ("dma-buf: Rename struct fence to dma_fence") > Signed-off-by: Philipp Stanner <phasta(a)kernel.org> > --- > I'm not entirely sure what Fixes-Tag is appropriate. The last time the > line causing the signalled fence in the list was touched is the commit > listed above. Yeah, that's most likely not correct. My educated guess is that the bug was always there just never discovered. Regards, Christian. > --- > drivers/gpu/drm/nouveau/nouveau_fence.c | 41 ++++++++++++++++--------- > drivers/gpu/drm/nouveau/nouveau_fence.h | 1 + > 2 files changed, 27 insertions(+), 15 deletions(-) > > diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c > index 7cc84472cece..b2c2241a8803 100644 > --- a/drivers/gpu/drm/nouveau/nouveau_fence.c > +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c > @@ -50,24 +50,22 @@ nouveau_fctx(struct nouveau_fence *fence) > return container_of(fence->base.lock, struct nouveau_fence_chan, lock); > } > > -static int > -nouveau_fence_signal(struct nouveau_fence *fence) > +static void > +nouveau_fence_cleanup_cb(struct dma_fence *dfence, struct dma_fence_cb *cb) > { > - int drop = 0; > + struct nouveau_fence_chan *fctx; > + struct nouveau_fence *fence; > + > + fence = container_of(dfence, struct nouveau_fence, base); > + fctx = nouveau_fctx(fence); > > - dma_fence_signal_locked(&fence->base); > list_del(&fence->head); > rcu_assign_pointer(fence->channel, NULL); > > - if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) { > - struct nouveau_fence_chan *fctx = nouveau_fctx(fence); > - > - if (!--fctx->notify_ref) > - drop = 1; > - } > + if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) > + --fctx->notify_ref; > > dma_fence_put(&fence->base); > - return drop; > } > > static struct nouveau_fence * > @@ -93,7 +91,8 @@ nouveau_fence_context_kill(struct nouveau_fence_chan *fctx, int error) > if (error) > dma_fence_set_error(&fence->base, error); > > - if (nouveau_fence_signal(fence)) > + dma_fence_signal_locked(&fence->base); > + if (fctx->notify_ref == 0) > nvif_event_block(&fctx->event); > } > fctx->killed = 1; > @@ -131,7 +130,6 @@ static int > nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx) > { > struct nouveau_fence *fence; > - int drop = 0; > u32 seq = fctx->read(chan); > > while (!list_empty(&fctx->pending)) { > @@ -140,10 +138,10 @@ nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fc > if ((int)(seq - fence->base.seqno) < 0) > break; > > - drop |= nouveau_fence_signal(fence); > + dma_fence_signal_locked(&fence->base); > } > > - return drop; > + return fctx->notify_ref == 0 ? 1 : 0; > } > > static void > @@ -235,6 +233,19 @@ nouveau_fence_emit(struct nouveau_fence *fence) > &fctx->lock, fctx->context, ++fctx->sequence); > kref_get(&fctx->fence_ref); > > + fence->cb.func = nouveau_fence_cleanup_cb; > + /* Adding a callback runs into __dma_fence_enable_signaling(), which will > + * ultimately run into nouveau_fence_no_signaling(), where a WARN_ON > + * would fire because the refcount can be dropped there. > + * > + * Increment the refcount here temporarily to work around that. > + */ > + dma_fence_get(&fence->base); > + ret = dma_fence_add_callback(&fence->base, &fence->cb, nouveau_fence_cleanup_cb); > + dma_fence_put(&fence->base); > + if (ret) > + return ret; > + > ret = fctx->emit(fence); > if (!ret) { > dma_fence_get(&fence->base); > diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.h b/drivers/gpu/drm/nouveau/nouveau_fence.h > index 8bc065acfe35..e6b2df7fdc42 100644 > --- a/drivers/gpu/drm/nouveau/nouveau_fence.h > +++ b/drivers/gpu/drm/nouveau/nouveau_fence.h > @@ -10,6 +10,7 @@ struct nouveau_bo; > > struct nouveau_fence { > struct dma_fence base; > + struct dma_fence_cb cb; > > struct list_head head; >

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