6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Philip Yang Philip.Yang@amd.com
[ Upstream commit eb3c357bcb286e89386e89302061fe717fe4e562 ]
If new range is splited to multiple pranges with max_svm_range_pages alignment and added to update_list, svm validate and map should keep going after error to make sure prange->mapped_to_gpu flag is up to date for the whole range.
svm validate and map update set prange->mapped_to_gpu after mapping to GPUs successfully, otherwise clear prange->mapped_to_gpu flag (for update mapping case) instead of setting error flag, we can remove the redundant error flag to simpliy code.
Refactor to remove goto and update prange->mapped_to_gpu flag inside svm_range_lock, to guarant we always evict queues or unmap from GPUs if there are invalid ranges.
After svm validate and map return error -EAGIN, the caller retry will update the mapping for the whole range again.
Fixes: c22b04407097 ("drm/amdkfd: flag added to handle errors from svm validate and map") Signed-off-by: Philip Yang Philip.Yang@amd.com Reviewed-by: Felix Kuehling Felix.Kuehling@amd.com Tested-by: James Zhu james.zhu@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 82 +++++++++++++--------------- drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 1 - 2 files changed, 39 insertions(+), 44 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index 8cbfe18d16c6e..50f943e04f8a4 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -809,7 +809,7 @@ svm_range_is_same_attrs(struct kfd_process *p, struct svm_range *prange, } }
- return !prange->is_error_flag; + return true; }
/** @@ -1627,71 +1627,66 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
start = prange->start << PAGE_SHIFT; end = (prange->last + 1) << PAGE_SHIFT; - for (addr = start; addr < end && !r; ) { + for (addr = start; !r && addr < end; ) { struct hmm_range *hmm_range; struct vm_area_struct *vma; - unsigned long next; + unsigned long next = 0; unsigned long offset; unsigned long npages; bool readonly;
vma = vma_lookup(mm, addr); - if (!vma) { + if (vma) { + readonly = !(vma->vm_flags & VM_WRITE); + + next = min(vma->vm_end, end); + npages = (next - addr) >> PAGE_SHIFT; + WRITE_ONCE(p->svms.faulting_task, current); + r = amdgpu_hmm_range_get_pages(&prange->notifier, addr, npages, + readonly, owner, NULL, + &hmm_range); + WRITE_ONCE(p->svms.faulting_task, NULL); + if (r) { + pr_debug("failed %d to get svm range pages\n", r); + if (r == -EBUSY) + r = -EAGAIN; + } + } else { r = -EFAULT; - goto unreserve_out; - } - readonly = !(vma->vm_flags & VM_WRITE); - - next = min(vma->vm_end, end); - npages = (next - addr) >> PAGE_SHIFT; - WRITE_ONCE(p->svms.faulting_task, current); - r = amdgpu_hmm_range_get_pages(&prange->notifier, addr, npages, - readonly, owner, NULL, - &hmm_range); - WRITE_ONCE(p->svms.faulting_task, NULL); - if (r) { - pr_debug("failed %d to get svm range pages\n", r); - if (r == -EBUSY) - r = -EAGAIN; - goto unreserve_out; }
- offset = (addr - start) >> PAGE_SHIFT; - r = svm_range_dma_map(prange, ctx->bitmap, offset, npages, - hmm_range->hmm_pfns); - if (r) { - pr_debug("failed %d to dma map range\n", r); - goto unreserve_out; + if (!r) { + offset = (addr - start) >> PAGE_SHIFT; + r = svm_range_dma_map(prange, ctx->bitmap, offset, npages, + hmm_range->hmm_pfns); + if (r) + pr_debug("failed %d to dma map range\n", r); }
svm_range_lock(prange); - if (amdgpu_hmm_range_get_pages_done(hmm_range)) { + if (!r && amdgpu_hmm_range_get_pages_done(hmm_range)) { pr_debug("hmm update the range, need validate again\n"); r = -EAGAIN; - goto unlock_out; } - if (!list_empty(&prange->child_list)) { + + if (!r && !list_empty(&prange->child_list)) { pr_debug("range split by unmap in parallel, validate again\n"); r = -EAGAIN; - goto unlock_out; }
- r = svm_range_map_to_gpus(prange, offset, npages, readonly, - ctx->bitmap, wait, flush_tlb); + if (!r) + r = svm_range_map_to_gpus(prange, offset, npages, readonly, + ctx->bitmap, wait, flush_tlb); + + if (!r && next == end) + prange->mapped_to_gpu = true;
-unlock_out: svm_range_unlock(prange);
addr = next; }
- if (addr == end) - prange->mapped_to_gpu = true; - -unreserve_out: svm_range_unreserve_bos(ctx); - - prange->is_error_flag = !!r; if (!r) prange->validate_timestamp = ktime_get_boottime();
@@ -2057,7 +2052,8 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size, next = interval_tree_iter_next(node, start, last); next_start = min(node->last, last) + 1;
- if (svm_range_is_same_attrs(p, prange, nattr, attrs)) { + if (svm_range_is_same_attrs(p, prange, nattr, attrs) && + prange->mapped_to_gpu) { /* nothing to do */ } else if (node->start < start || node->last > last) { /* node intersects the update range and its attributes @@ -3470,7 +3466,7 @@ svm_range_set_attr(struct kfd_process *p, struct mm_struct *mm, struct svm_range *next; bool update_mapping = false; bool flush_tlb; - int r = 0; + int r, ret = 0;
pr_debug("pasid 0x%x svms 0x%p [0x%llx 0x%llx] pages 0x%llx\n", p->pasid, &p->svms, start, start + size - 1, size); @@ -3558,7 +3554,7 @@ svm_range_set_attr(struct kfd_process *p, struct mm_struct *mm, out_unlock_range: mutex_unlock(&prange->migrate_mutex); if (r) - break; + ret = r; }
svm_range_debug_dump(svms); @@ -3571,7 +3567,7 @@ svm_range_set_attr(struct kfd_process *p, struct mm_struct *mm, pr_debug("pasid 0x%x svms 0x%p [0x%llx 0x%llx] done, r=%d\n", p->pasid, &p->svms, start, start + size - 1, r);
- return r; + return ret ? ret : r; }
static int diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h index 21ca57992e054..d2aa8c324c610 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h @@ -133,7 +133,6 @@ struct svm_range { DECLARE_BITMAP(bitmap_access, MAX_GPU_INSTANCE); DECLARE_BITMAP(bitmap_aip, MAX_GPU_INSTANCE); bool mapped_to_gpu; - bool is_error_flag; };
static inline void svm_range_lock(struct svm_range *prange)