Linaro-mm-sig

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17 participants
4318 discussions

[RFC v2 11/11] io_uring/rsrc: implement dmabuf regbuf import

by asml.silence＠gmail.com

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

9 months, 4 weeks

[RFC v2 09/11] io_uring/rsrc: extended reg buffer registration

by asml.silence＠gmail.com

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

9 months, 4 weeks

[RFC v2 08/11] io_uring/rsrc: add imu flags

by asml.silence＠gmail.com

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

9 months, 4 weeks

[PATCH v2 0/9] Initial DMABUF support for iommufd

by Jason Gunthorpe

This series is the start of adding full DMABUF support to iommufd. Currently it is limited to only work with VFIO's DMABUF exporter. It sits on top of Leon's series to add a DMABUF exporter to VFIO: https://lore.kernel.org/all/20251120-dmabuf-vfio-v9-0-d7f71607f371@nvidia.c… The existing IOMMU_IOAS_MAP_FILE is enhanced to detect DMABUF fd's, but otherwise works the same as it does today for a memfd. The user can select a slice of the FD to map into the ioas and if the underliyng alignment requirements are met it will be placed in the iommu_domain. Though limited, it is enough to allow a VMM like QEMU to connect MMIO BAR memory from VFIO to an iommu_domain controlled by iommufd. This is used for PCI Peer to Peer support in VMs, and is the last feature that the VFIO type 1 container has that iommufd couldn't do. The VFIO type1 version extracts raw PFNs from VMAs, which has no lifetime control and is a use-after-free security problem. Instead iommufd relies on revokable DMABUFs. Whenever VFIO thinks there should be no access to the MMIO it can shoot down the mapping in iommufd which will unmap it from the iommu_domain. There is no automatic remap, this is a safety protocol so the kernel doesn't get stuck. Userspace is expected to know it is doing something that will revoke the dmabuf and map/unmap it around the activity. Eg when QEMU goes to issue FLR it should do the map/unmap to iommufd. Since DMABUF is missing some key general features for this use case it relies on a "private interconnect" between VFIO and iommufd via the vfio_pci_dma_buf_iommufd_map() call. The call confirms the DMABUF has revoke semantics and delivers a phys_addr for the memory suitable for use with iommu_map(). Medium term there is a desire to expand the supported DMABUFs to include GPU drivers to support DPDK/SPDK type use cases so future series will work to add a general concept of revoke and a general negotiation of interconnect to remove vfio_pci_dma_buf_iommufd_map(). I also plan another series to modify iommufd's vfio_compat to transparently pull a dmabuf out of a VFIO VMA to emulate more of the uAPI of type1. The latest series for interconnect negotation to exchange a phys_addr is: https://lore.kernel.org/r/20251027044712.1676175-1-vivek.kasireddy@intel.com And the discussion for design of revoke is here: https://lore.kernel.org/dri-devel/20250114173103.GE5556@nvidia.com/ This is on github: https://github.com/jgunthorpe/linux/commits/iommufd_dmabuf v2: - Rebase on Leon's v9 - Fix mislocking in an iopt_fill_domain() error path - Revise the comments around how the sub page offset works - Remove a useless WARN_ON in iopt_pages_rw_access() - Fixed missed memory free in the selftest v1: https://patch.msgid.link/r/0-v1-64bed2430cdb+31b-iommufd_dmabuf_jgg@nvidia.… Jason Gunthorpe (9): vfio/pci: Add vfio_pci_dma_buf_iommufd_map() iommufd: Add DMABUF to iopt_pages iommufd: Do not map/unmap revoked DMABUFs iommufd: Allow a DMABUF to be revoked iommufd: Allow MMIO pages in a batch iommufd: Have pfn_reader process DMABUF iopt_pages iommufd: Have iopt_map_file_pages convert the fd to a file iommufd: Accept a DMABUF through IOMMU_IOAS_MAP_FILE iommufd/selftest: Add some tests for the dmabuf flow drivers/iommu/iommufd/io_pagetable.c | 78 +++- drivers/iommu/iommufd/io_pagetable.h | 54 ++- drivers/iommu/iommufd/ioas.c | 8 +- drivers/iommu/iommufd/iommufd_private.h | 14 +- drivers/iommu/iommufd/iommufd_test.h | 10 + drivers/iommu/iommufd/main.c | 10 + drivers/iommu/iommufd/pages.c | 414 ++++++++++++++++-- drivers/iommu/iommufd/selftest.c | 143 ++++++ drivers/vfio/pci/vfio_pci_dmabuf.c | 34 ++ include/linux/vfio_pci_core.h | 4 + tools/testing/selftests/iommu/iommufd.c | 43 ++ tools/testing/selftests/iommu/iommufd_utils.h | 44 ++ 12 files changed, 786 insertions(+), 70 deletions(-) base-commit: f836737ed56db9e2d5b047c56a31e05af0f3f116 -- 2.43.0

10 months

[PATCH v3 00/28] drm/amdgpu: use all SDMA instances for TTM clears and moves

by Pierre-Eric Pelloux-Prayer

The drm/ttm patch modifies TTM to support multiple contexts for the pipelined moves. Then amdgpu/ttm is updated to express dependencies between jobs explicitely, instead of relying on the ordering of execution guaranteed by the use of a single instance. With all of this in place, we can use multiple entities, with each having access to the available SDMA instances. This rework also gives the opportunity to merge the clear functions into a single one and to optimize a bit GART usage. (The first patch of the series has already been merged through drm-misc but I'm including it here to reduce conflicts) For v3 I've kept the series as a whole but I've reorganized the patches so that everything up to the drm/ttm change can be merged through amd-staging-drm-next once reviewed. v3: - shuffled the patches: everything up to the drm/ttm patch has no dependency on the ttm change and be merged independently - split "drm/amdgpu: pass the entity to use to ttm functions" in 2 commits - moved AMDGPU_GTT_NUM_TRANSFER_WINDOWS removal to its own commit - added a ttm job submission helper - addressed comments from Christian and Felix v2: - addressed comments from Christian - dropped "drm/amdgpu: prepare amdgpu_fill_buffer to use N entities" and "drm/amdgpu: use multiple entities in amdgpu_fill_buffer" - added "drm/admgpu: handle resv dependencies in amdgpu_ttm_map_buffer", "drm/amdgpu: round robin through clear_entities in amdgpu_fill_buffer" - reworked how sdma rings/scheds are passed to amdgpu_ttm v1: https://lists.freedesktop.org/archives/dri-devel/2025-November/534517.html Pierre-Eric Pelloux-Prayer (28): drm/amdgpu: give each kernel job a unique id drm/amdgpu: use ttm_resource_manager_cleanup drm/amdgpu: remove direct_submit arg from amdgpu_copy_buffer drm/amdgpu: remove the ring param from ttm functions drm/amdgpu: introduce amdgpu_ttm_buffer_entity drm/amdgpu: add amdgpu_ttm_job_submit helper drm/amdgpu: fix error handling in amdgpu_copy_buffer drm/amdgpu: pass the entity to use to amdgpu_ttm_map_buffer drm/amdgpu: pass the entity to use to ttm public functions drm/amdgpu: add amdgpu_device argument to ttm functions that need it drm/amdgpu: statically assign gart windows to ttm entities drm/amdgpu: remove AMDGPU_GTT_NUM_TRANSFER_WINDOWS drm/amdgpu: add missing lock when using ttm entities drm/amdgpu: check entity lock is held in amdgpu_ttm_job_submit drm/amdgpu: double AMDGPU_GTT_MAX_TRANSFER_SIZE drm/amdgpu: use larger gart window when possible drm/amdgpu: introduce amdgpu_sdma_set_vm_pte_scheds drm/amdgpu: move sched status check inside amdgpu_ttm_set_buffer_funcs_status drm/ttm: rework pipelined eviction fence handling drm/amdgpu: allocate multiple clear entities drm/amdgpu: allocate multiple move entities drm/amdgpu: round robin through clear_entities in amdgpu_fill_buffer drm/amdgpu: use TTM_NUM_MOVE_FENCES when reserving fences drm/amdgpu: use multiple entities in amdgpu_move_blit drm/amdgpu: pass all the sdma scheds to amdgpu_mman drm/amdgpu: give ttm entities access to all the sdma scheds drm/amdgpu: get rid of amdgpu_ttm_clear_buffer drm/amdgpu: rename amdgpu_fill_buffer as amdgpu_ttm_clear_buffer drivers/gpu/drm/amd/amdgpu/amdgpu.h | 4 + drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c | 8 +- drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 5 +- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 15 +- drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 3 +- drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 14 +- drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 8 +- drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 5 +- drivers/gpu/drm/amd/amdgpu/amdgpu_job.h | 19 +- drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c | 3 +- drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 16 +- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 493 +++++++++++------- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 58 ++- drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c | 3 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c | 11 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h | 3 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c | 8 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 6 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 26 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c | 4 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c | 4 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 12 +- drivers/gpu/drm/amd/amdgpu/cik_sdma.c | 34 +- drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c | 34 +- drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 34 +- drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 41 +- drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c | 41 +- drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c | 37 +- drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c | 37 +- drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c | 32 +- drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c | 32 +- drivers/gpu/drm/amd/amdgpu/si_dma.c | 34 +- drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c | 6 +- drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c | 6 +- drivers/gpu/drm/amd/amdgpu/vce_v1_0.c | 12 +- drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 33 +- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 3 +- .../amd/display/amdgpu_dm/amdgpu_dm_plane.c | 6 +- .../drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c | 6 +- .../gpu/drm/ttm/tests/ttm_bo_validate_test.c | 11 +- drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 5 +- drivers/gpu/drm/ttm/ttm_bo.c | 47 +- drivers/gpu/drm/ttm/ttm_bo_util.c | 38 +- drivers/gpu/drm/ttm/ttm_resource.c | 31 +- include/drm/ttm/ttm_resource.h | 29 +- 47 files changed, 706 insertions(+), 615 deletions(-) -- 2.43.0

10 months

[PATCH v2] dma-buf: system_heap: use larger contiguous mappings instead of per-page mmap

by Barry Song

From: Barry Song <v-songbaohua(a)oppo.com> We can allocate high-order pages, but mapping them one by one is inefficient. This patch changes the code to map as large a chunk as possible. The code looks somewhat complicated mainly because supporting mmap with a non-zero offset is a bit tricky. Using the micro-benchmark below, we see that mmap becomes 3.5X faster: #include <stdio.h> #include <fcntl.h> #include <linux/dma-heap.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <time.h> #include <unistd.h> #include <stdlib.h> #define SIZE (512UL * 1024 * 1024) #define PAGE 4096 #define STRIDE (PAGE/sizeof(int)) #define PAGES (SIZE/PAGE) int main(void) { int heap = open("/dev/dma_heap/system", O_RDONLY); struct dma_heap_allocation_data d = { .len = SIZE, .fd_flags = O_RDWR|O_CLOEXEC }; ioctl(heap, DMA_HEAP_IOCTL_ALLOC, &d); struct timespec t0, t1; clock_gettime(CLOCK_MONOTONIC, &t0); int *p = mmap(NULL, SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, d.fd, 0); clock_gettime(CLOCK_MONOTONIC, &t1); for (int i = 0; i < PAGES; i++) p[i*STRIDE] = i; for (int i = 0; i < PAGES; i++) if (p[i*STRIDE] != i) { fprintf(stderr, "mismatch at page %d\n", i); exit(1); } long ns = (t1.tv_sec-t0.tv_sec)*1000000000L + (t1.tv_nsec-t0.tv_nsec); printf("mmap 512MB took %.3f us, verify OK\n", ns/1000.0); return 0; } W/ patch: ~ # ./a.out mmap 512MB took 200266.000 us, verify OK ~ # ./a.out mmap 512MB took 198151.000 us, verify OK ~ # ./a.out mmap 512MB took 197069.000 us, verify OK ~ # ./a.out mmap 512MB took 196781.000 us, verify OK ~ # ./a.out mmap 512MB took 198102.000 us, verify OK ~ # ./a.out mmap 512MB took 195552.000 us, verify OK W/o patch: ~ # ./a.out mmap 512MB took 6987470.000 us, verify OK ~ # ./a.out mmap 512MB took 6970739.000 us, verify OK ~ # ./a.out mmap 512MB took 6984383.000 us, verify OK ~ # ./a.out mmap 512MB took 6971311.000 us, verify OK ~ # ./a.out mmap 512MB took 6991680.000 us, verify OK Signed-off-by: Barry Song <v-songbaohua(a)oppo.com> Acked-by: John Stultz <jstultz(a)google.com> --- -v2: collect John's ack. thanks! drivers/dma-buf/heaps/system_heap.c | 33 +++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index bbe7881f1360..4c782fe33fd4 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -186,20 +186,35 @@ static int system_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) struct system_heap_buffer *buffer = dmabuf->priv; struct sg_table *table = &buffer->sg_table; unsigned long addr = vma->vm_start; - struct sg_page_iter piter; - int ret; + unsigned long pgoff = vma->vm_pgoff; + struct scatterlist *sg; + int i, ret; + + for_each_sgtable_sg(table, sg, i) { + unsigned long n = sg->length >> PAGE_SHIFT; - for_each_sgtable_page(table, &piter, vma->vm_pgoff) { - struct page *page = sg_page_iter_page(&piter); + if (pgoff < n) + break; + pgoff -= n; + } + + for (; sg && addr < vma->vm_end; sg = sg_next(sg)) { + unsigned long n = (sg->length >> PAGE_SHIFT) - pgoff; + struct page *page = sg_page(sg) + pgoff; + unsigned long size = n << PAGE_SHIFT; + + if (addr + size > vma->vm_end) + size = vma->vm_end - addr; - ret = remap_pfn_range(vma, addr, page_to_pfn(page), PAGE_SIZE, - vma->vm_page_prot); + ret = remap_pfn_range(vma, addr, page_to_pfn(page), + size, vma->vm_page_prot); if (ret) return ret; - addr += PAGE_SIZE; - if (addr >= vma->vm_end) - return 0; + + addr += size; + pgoff = 0; } + return 0; } -- 2.39.3 (Apple Git-146)

10 months

Re: [PATCH v9 10/11] vfio/pci: Add dma-buf export support for MMIO regions

by Jason Gunthorpe

On Thu, Nov 20, 2025 at 05:04:13PM -0700, Alex Williamson wrote: > @@ -2501,7 +2501,7 @@ static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set, > err_undo: > list_for_each_entry_from_reverse(vdev, &dev_set->device_list, > vdev.dev_set_list) { > - if (__vfio_pci_memory_enabled(vdev)) > + if (vdev->vdev.open_count && __vfio_pci_memory_enabled(vdev)) > vfio_pci_dma_buf_move(vdev, false); > up_write(&vdev->memory_lock); > } > > Any other suggestions? This should be the only reset path with this > nuance of affecting non-opened devices. Thanks, Seems reasonable, but should it be in __vfio_pci_memory_enabled() just to be robust? Jason

10 months

[PATCH 0/9] Initial DMABUF support for iommufd

by Jason Gunthorpe

This series is the start of adding full DMABUF support to iommufd. Currently it is limited to only work with VFIO's DMABUF exporter. It sits on top of Leon's series to add a DMABUF exporter to VFIO: https://lore.kernel.org/r/20251106-dmabuf-vfio-v7-0-2503bf390699@nvidia.com The existing IOMMU_IOAS_MAP_FILE is enhanced to detect DMABUF fd's, but otherwise works the same as it does today for a memfd. The user can select a slice of the FD to map into the ioas and if the underliyng alignment requirements are met it will be placed in the iommu_domain. Though limited, it is enough to allow a VMM like QEMU to connect MMIO BAR memory from VFIO to an iommu_domain controlled by iommufd. This is used for PCI Peer to Peer support in VMs, and is the last feature that the VFIO type 1 container has that iommufd couldn't do. The VFIO type1 version extracts raw PFNs from VMAs, which has no lifetime control and is a use-after-free security problem. Instead iommufd relies on revokable DMABUFs. Whenever VFIO thinks there should be no access to the MMIO it can shoot down the mapping in iommufd which will unmap it from the iommu_domain. There is no automatic remap, this is a safety protocol so the kernel doesn't get stuck. Userspace is expected to know it is doing something that will revoke the dmabuf and map/unmap it around the activity. Eg when QEMU goes to issue FLR it should do the map/unmap to iommufd. Since DMABUF is missing some key general features for this use case it relies on a "private interconnect" between VFIO and iommufd via the vfio_pci_dma_buf_iommufd_map() call. The call confirms the DMABUF has revoke semantics and delivers a phys_addr for the memory suitable for use with iommu_map(). Medium term there is a desire to expand the supported DMABUFs to include GPU drivers to support DPDK/SPDK type use cases so future series will work to add a general concept of revoke and a general negotiation of interconnect to remove vfio_pci_dma_buf_iommufd_map(). I also plan another series to modify iommufd's vfio_compat to transparently pull a dmabuf out of a VFIO VMA to emulate more of the uAPI of type1. The latest series for interconnect negotation to exchange a phys_addr is: https://lore.kernel.org/r/20251027044712.1676175-1-vivek.kasireddy@intel.com And the discussion for design of revoke is here: https://lore.kernel.org/dri-devel/20250114173103.GE5556@nvidia.com/ This is on github: https://github.com/jgunthorpe/linux/commits/iommufd_dmabuf v2: - Rebase on Leon's v7 - Fix mislocking in an iopt_fill_domain() error path v1: https://patch.msgid.link/r/0-v1-64bed2430cdb+31b-iommufd_dmabuf_jgg@nvidia.… Jason Gunthorpe (9): vfio/pci: Add vfio_pci_dma_buf_iommufd_map() iommufd: Add DMABUF to iopt_pages iommufd: Do not map/unmap revoked DMABUFs iommufd: Allow a DMABUF to be revoked iommufd: Allow MMIO pages in a batch iommufd: Have pfn_reader process DMABUF iopt_pages iommufd: Have iopt_map_file_pages convert the fd to a file iommufd: Accept a DMABUF through IOMMU_IOAS_MAP_FILE iommufd/selftest: Add some tests for the dmabuf flow drivers/iommu/iommufd/io_pagetable.c | 78 +++- drivers/iommu/iommufd/io_pagetable.h | 53 ++- drivers/iommu/iommufd/ioas.c | 8 +- drivers/iommu/iommufd/iommufd_private.h | 14 +- drivers/iommu/iommufd/iommufd_test.h | 10 + drivers/iommu/iommufd/main.c | 10 + drivers/iommu/iommufd/pages.c | 407 ++++++++++++++++-- drivers/iommu/iommufd/selftest.c | 142 ++++++ drivers/vfio/pci/vfio_pci_dmabuf.c | 34 ++ include/linux/vfio_pci_core.h | 4 + tools/testing/selftests/iommu/iommufd.c | 43 ++ tools/testing/selftests/iommu/iommufd_utils.h | 44 ++ 12 files changed, 781 insertions(+), 66 deletions(-) base-commit: bb04e92c86b44b3e36532099b68de1e889acfee7 -- 2.43.0

10 months

Re: [PATCH v9 11/11] vfio/nvgrace: Support get_dmabuf_phys

by ankita＠nvidia.com

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

10 months

[PATCH] drm/xe: Fix memory leak when handling pagefault vma

by Mika Kuoppala

When the pagefault handling code was moved to a new file, an extra drm_exec_init() was added to the VMA path. This call is unnecessary because xe_validation_ctx_init() already performs a drm_exec_init(), resulting in a memory leak reported by kmemleak. Remove the redundant drm_exec_init() from the VMA pagefault handling code. Fixes: fb544b844508 ("drm/xe: Implement xe_pagefault_queue_work") Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: Stuart Summers <stuart.summers(a)intel.com> Cc: Lucas De Marchi <lucas.demarchi(a)intel.com> Cc: "Thomas Hellström" <thomas.hellstrom(a)linux.intel.com> Cc: Rodrigo Vivi <rodrigo.vivi(a)intel.com> Cc: Sumit Semwal <sumit.semwal(a)linaro.org> Cc: "Christian König" <christian.koenig(a)amd.com> Cc: intel-xe(a)lists.freedesktop.org Cc: linux-media(a)vger.kernel.org Cc: dri-devel(a)lists.freedesktop.org Cc: linaro-mm-sig(a)lists.linaro.org Signed-off-by: Mika Kuoppala <mika.kuoppala(a)linux.intel.com> --- drivers/gpu/drm/xe/xe_pagefault.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/xe/xe_pagefault.c b/drivers/gpu/drm/xe/xe_pagefault.c index fe3e40145012..afb06598b6e1 100644 --- a/drivers/gpu/drm/xe/xe_pagefault.c +++ b/drivers/gpu/drm/xe/xe_pagefault.c @@ -102,7 +102,6 @@ static int xe_pagefault_handle_vma(struct xe_gt *gt, struct xe_vma *vma, /* Lock VM and BOs dma-resv */ xe_validation_ctx_init(&ctx, &vm->xe->val, &exec, (struct xe_val_flags) {}); - drm_exec_init(&exec, 0, 0); drm_exec_until_all_locked(&exec) { err = xe_pagefault_begin(&exec, vma, tile->mem.vram, needs_vram == 1); -- 2.43.0

10 months

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