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 RUdVeOp6 PV42Vb6xk5P2tVOEMiRjAK2emZ2UtCE3A/dLwPVT5O4gT6NG+1dnBs5dpGNwYEcjOJ1dEP9EIEwA923r3vQFOnI8w048ZWnQxD2epxbdmY8qSCYb4ESzOHmXHKqOfE7bpimerPJW5BJDCSOhr5F5U3TKd5pV+3tZiOffPlyuUB1+sZIwJAYPU3LrYB8a7NR76G8bsVND8hj8PlxReBCqmp+1lqxxu7Nn3FSdphcda+BQ9+kSmOthoG2S8/mVm+StFmu2G+wjbsDDqvo+7IbSKuY3TyukPdItz3/rZ2TT15g7Nhfk0JVqNMLL2Ny3hdkA6LnXQgwv0E5dXPrOrBYNrA9D9/WlHQUZn/ZpBwXHNPFOjKaysIoD9tGpFQG7Mn5IvHTgUHr7nimG3mFsw52Rl9lcygJruwQBO7cDVaqYA2GrAtj3trd7gf8NCfZJP1IMqY0h3Gz61DAshijo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/6/26 07:25, Honglei Huang wrote: > From: Honglei Huang > > Hi all, > > This is v3 of the patch series to support allocating multiple non-contiguous > CPU virtual address ranges that map to a single contiguous GPU virtual address. > > v3: > 1. No new ioctl: Reuses existing AMDKFD_IOC_ALLOC_MEMORY_OF_GPU > - Adds only one flag: KFD_IOC_ALLOC_MEM_FLAGS_USERPTR_BATCH That is most likely not the best approach, but Felix or Philip need to comment here since I don't know such IOCTLs well either. > - When flag is set, mmap_offset field points to range array > - Minimal API surface change Why range of VA space for each entry? > 2. Improved MMU notifier handling: > - Single mmu_interval_notifier covering the VA span [va_min, va_max] > - Interval tree for efficient lookup of affected ranges during invalidation > - Avoids per-range notifier overhead mentioned in v2 review That won't work unless you also modify hmm_range_fault() to take multiple VA addresses (or ranges) at the same time. The problem is that we must rely on hmm_range.notifier_seq to detect changes to the page tables in question, but that in turn works only if you have one hmm_range structure and not multiple. What might work is doing an XOR or CRC over all hmm_range.notifier_seq you have, but that is a bit flaky. Regards, Christian. > > 3. Better code organization: Split into 8 focused patches for easier review > > v2: > - Each CPU VA range gets its own mmu_interval_notifier for invalidation > - All ranges validated together and mapped to contiguous GPU VA > - Single kgd_mem object with array of user_range_info structures > - Unified eviction/restore path for all ranges in a batch > > Current Implementation Approach > =============================== > > This series implements a practical solution within existing kernel constraints: > > 1. Single MMU notifier for VA span: Register one notifier covering the > entire range from lowest to highest address in the batch > > 2. Interval tree filtering: Use interval tree to efficiently identify > which specific ranges are affected during invalidation callbacks, > avoiding unnecessary processing for unrelated address changes > > 3. Unified eviction/restore: All ranges in a batch share eviction and > restore paths, maintaining consistency with existing userptr handling > > Patch Series Overview > ===================== > > Patch 1/8: Add userptr batch allocation UAPI structures > - KFD_IOC_ALLOC_MEM_FLAGS_USERPTR_BATCH flag > - kfd_ioctl_userptr_range and kfd_ioctl_userptr_ranges_data structures > > Patch 2/8: Add user_range_info infrastructure to kgd_mem > - user_range_info structure for per-range tracking > - Fields for batch allocation in kgd_mem > > Patch 3/8: Implement interval tree for userptr ranges > - Interval tree for efficient range lookup during invalidation > - mark_invalid_ranges() function > > Patch 4/8: Add batch MMU notifier support > - Single notifier for entire VA span > - Invalidation callback using interval tree filtering > > Patch 5/8: Implement batch userptr page management > - get_user_pages_batch() and set_user_pages_batch() > - Per-range page array management > > Patch 6/8: Add batch allocation function and export API > - init_user_pages_batch() main initialization > - amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu_batch() entry point > > Patch 7/8: Unify userptr cleanup and update paths > - Shared eviction/restore handling for batch allocations > - Integration with existing userptr validation flows > > Patch 8/8: Wire up batch allocation in ioctl handler > - Input validation and range array parsing > - Integration with existing alloc_memory_of_gpu path > > Testing > ======= > > - Multiple scattered malloc() allocations (2-4000+ ranges) > - Various allocation sizes (4KB to 1G+ per range) > - Memory pressure scenarios and eviction/restore cycles > - OpenCL CTS and HIP catch tests in KVM guest environment > - AI workloads: Stable Diffusion, ComfyUI in virtualized environments > - Small LLM inference (3B-7B models) > - Benchmark score: 160,000 - 190,000 (80%-95% of bare metal) > - Performance improvement: 2x-2.4x faster than userspace approach > > Thank you for your review and feedback. > > Best regards, > Honglei Huang > > Honglei Huang (8): > drm/amdkfd: Add userptr batch allocation UAPI structures > drm/amdkfd: Add user_range_info infrastructure to kgd_mem > drm/amdkfd: Implement interval tree for userptr ranges > drm/amdkfd: Add batch MMU notifier support > drm/amdkfd: Implement batch userptr page management > drm/amdkfd: Add batch allocation function and export API > drm/amdkfd: Unify userptr cleanup and update paths > drm/amdkfd: Wire up batch allocation in ioctl handler > > drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 23 + > .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 539 +++++++++++++++++- > drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 128 ++++- > include/uapi/linux/kfd_ioctl.h | 31 +- > 4 files changed, 697 insertions(+), 24 deletions(-) >