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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c')
-rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c new file mode 100644 index 0000000000..081267161d --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c @@ -0,0 +1,251 @@ +/* + * Copyright 2014 Advanced Micro Devices, Inc. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + */ +/* + * Authors: + * Christian König <christian.koenig@amd.com> + */ + +/** + * DOC: MMU Notifier + * + * For coherent userptr handling registers an MMU notifier to inform the driver + * about updates on the page tables of a process. + * + * When somebody tries to invalidate the page tables we block the update until + * all operations on the pages in question are completed, then those pages are + * marked as accessed and also dirty if it wasn't a read only access. + * + * New command submissions using the userptrs in question are delayed until all + * page table invalidation are completed and we once more see a coherent process + * address space. + */ + +#include <linux/firmware.h> +#include <linux/module.h> +#include <drm/drm.h> + +#include "amdgpu.h" +#include "amdgpu_amdkfd.h" +#include "amdgpu_hmm.h" + +#define MAX_WALK_BYTE (2UL << 30) + +/** + * amdgpu_hmm_invalidate_gfx - callback to notify about mm change + * + * @mni: the range (mm) is about to update + * @range: details on the invalidation + * @cur_seq: Value to pass to mmu_interval_set_seq() + * + * Block for operations on BOs to finish and mark pages as accessed and + * potentially dirty. + */ +static bool amdgpu_hmm_invalidate_gfx(struct mmu_interval_notifier *mni, + const struct mmu_notifier_range *range, + unsigned long cur_seq) +{ + struct amdgpu_bo *bo = container_of(mni, struct amdgpu_bo, notifier); + struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); + long r; + + if (!mmu_notifier_range_blockable(range)) + return false; + + mutex_lock(&adev->notifier_lock); + + mmu_interval_set_seq(mni, cur_seq); + + r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_BOOKKEEP, + false, MAX_SCHEDULE_TIMEOUT); + mutex_unlock(&adev->notifier_lock); + if (r <= 0) + DRM_ERROR("(%ld) failed to wait for user bo\n", r); + return true; +} + +static const struct mmu_interval_notifier_ops amdgpu_hmm_gfx_ops = { + .invalidate = amdgpu_hmm_invalidate_gfx, +}; + +/** + * amdgpu_hmm_invalidate_hsa - callback to notify about mm change + * + * @mni: the range (mm) is about to update + * @range: details on the invalidation + * @cur_seq: Value to pass to mmu_interval_set_seq() + * + * We temporarily evict the BO attached to this range. This necessitates + * evicting all user-mode queues of the process. + */ +static bool amdgpu_hmm_invalidate_hsa(struct mmu_interval_notifier *mni, + const struct mmu_notifier_range *range, + unsigned long cur_seq) +{ + struct amdgpu_bo *bo = container_of(mni, struct amdgpu_bo, notifier); + + if (!mmu_notifier_range_blockable(range)) + return false; + + amdgpu_amdkfd_evict_userptr(mni, cur_seq, bo->kfd_bo); + + return true; +} + +static const struct mmu_interval_notifier_ops amdgpu_hmm_hsa_ops = { + .invalidate = amdgpu_hmm_invalidate_hsa, +}; + +/** + * amdgpu_hmm_register - register a BO for notifier updates + * + * @bo: amdgpu buffer object + * @addr: userptr addr we should monitor + * + * Registers a mmu_notifier for the given BO at the specified address. + * Returns 0 on success, -ERRNO if anything goes wrong. + */ +int amdgpu_hmm_register(struct amdgpu_bo *bo, unsigned long addr) +{ + if (bo->kfd_bo) + return mmu_interval_notifier_insert(&bo->notifier, current->mm, + addr, amdgpu_bo_size(bo), + &amdgpu_hmm_hsa_ops); + return mmu_interval_notifier_insert(&bo->notifier, current->mm, addr, + amdgpu_bo_size(bo), + &amdgpu_hmm_gfx_ops); +} + +/** + * amdgpu_hmm_unregister - unregister a BO for notifier updates + * + * @bo: amdgpu buffer object + * + * Remove any registration of mmu notifier updates from the buffer object. + */ +void amdgpu_hmm_unregister(struct amdgpu_bo *bo) +{ + if (!bo->notifier.mm) + return; + mmu_interval_notifier_remove(&bo->notifier); + bo->notifier.mm = NULL; +} + +int amdgpu_hmm_range_get_pages(struct mmu_interval_notifier *notifier, + uint64_t start, uint64_t npages, bool readonly, + void *owner, struct page **pages, + struct hmm_range **phmm_range) +{ + struct hmm_range *hmm_range; + unsigned long end; + unsigned long timeout; + unsigned long i; + unsigned long *pfns; + int r = 0; + + hmm_range = kzalloc(sizeof(*hmm_range), GFP_KERNEL); + if (unlikely(!hmm_range)) + return -ENOMEM; + + pfns = kvmalloc_array(npages, sizeof(*pfns), GFP_KERNEL); + if (unlikely(!pfns)) { + r = -ENOMEM; + goto out_free_range; + } + + hmm_range->notifier = notifier; + hmm_range->default_flags = HMM_PFN_REQ_FAULT; + if (!readonly) + hmm_range->default_flags |= HMM_PFN_REQ_WRITE; + hmm_range->hmm_pfns = pfns; + hmm_range->start = start; + end = start + npages * PAGE_SIZE; + hmm_range->dev_private_owner = owner; + + do { + hmm_range->end = min(hmm_range->start + MAX_WALK_BYTE, end); + + pr_debug("hmm range: start = 0x%lx, end = 0x%lx", + hmm_range->start, hmm_range->end); + + /* Assuming 128MB takes maximum 1 second to fault page address */ + timeout = max((hmm_range->end - hmm_range->start) >> 27, 1UL); + timeout *= HMM_RANGE_DEFAULT_TIMEOUT; + timeout = jiffies + msecs_to_jiffies(timeout); + +retry: + hmm_range->notifier_seq = mmu_interval_read_begin(notifier); + r = hmm_range_fault(hmm_range); + if (unlikely(r)) { + /* + * FIXME: This timeout should encompass the retry from + * mmu_interval_read_retry() as well. + */ + if (r == -EBUSY && !time_after(jiffies, timeout)) + goto retry; + goto out_free_pfns; + } + + if (hmm_range->end == end) + break; + hmm_range->hmm_pfns += MAX_WALK_BYTE >> PAGE_SHIFT; + hmm_range->start = hmm_range->end; + schedule(); + } while (hmm_range->end < end); + + hmm_range->start = start; + hmm_range->hmm_pfns = pfns; + + /* + * Due to default_flags, all pages are HMM_PFN_VALID or + * hmm_range_fault() fails. FIXME: The pages cannot be touched outside + * the notifier_lock, and mmu_interval_read_retry() must be done first. + */ + for (i = 0; pages && i < npages; i++) + pages[i] = hmm_pfn_to_page(pfns[i]); + + *phmm_range = hmm_range; + + return 0; + +out_free_pfns: + kvfree(pfns); +out_free_range: + kfree(hmm_range); + + return r; +} + +bool amdgpu_hmm_range_get_pages_done(struct hmm_range *hmm_range) +{ + bool r; + + r = mmu_interval_read_retry(hmm_range->notifier, + hmm_range->notifier_seq); + kvfree(hmm_range->hmm_pfns); + kfree(hmm_range); + + return r; +} |