[PATCH 10/34] drm/amdkfd: map svm range to GPUs
Felix Kuehling
Felix.Kuehling at amd.com
Tue Apr 6 01:46:05 UTC 2021
Use amdgpu_vm_bo_update_mapping to update GPU page table to map or unmap
svm range system memory pages address to GPUs.
Signed-off-by: Philip Yang <Philip.Yang at amd.com>
Signed-off-by: Alex Sierra <alex.sierra at amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 473 ++++++++++++++++++++++++++-
drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 4 +
2 files changed, 474 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 9eaff28bdc13..d951af42feed 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -98,11 +98,123 @@ static void svm_range_remove_notifier(struct svm_range *prange)
mmu_interval_notifier_remove(&prange->notifier);
}
+static int
+svm_range_dma_map_dev(struct device *dev, dma_addr_t **dma_addr,
+ unsigned long *hmm_pfns, uint64_t npages)
+{
+ enum dma_data_direction dir = DMA_BIDIRECTIONAL;
+ dma_addr_t *addr = *dma_addr;
+ struct page *page;
+ int i, r;
+
+ if (!addr) {
+ addr = kvmalloc_array(npages, sizeof(*addr),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!addr)
+ return -ENOMEM;
+ *dma_addr = addr;
+ }
+
+ for (i = 0; i < npages; i++) {
+ if (WARN_ONCE(addr[i] && !dma_mapping_error(dev, addr[i]),
+ "leaking dma mapping\n"))
+ dma_unmap_page(dev, addr[i], PAGE_SIZE, dir);
+
+ page = hmm_pfn_to_page(hmm_pfns[i]);
+ addr[i] = dma_map_page(dev, page, 0, PAGE_SIZE, dir);
+ r = dma_mapping_error(dev, addr[i]);
+ if (r) {
+ pr_debug("failed %d dma_map_page\n", r);
+ return r;
+ }
+ pr_debug("dma mapping 0x%llx for page addr 0x%lx\n",
+ addr[i] >> PAGE_SHIFT, page_to_pfn(page));
+ }
+ return 0;
+}
+
+static int
+svm_range_dma_map(struct svm_range *prange, unsigned long *bitmap,
+ unsigned long *hmm_pfns)
+{
+ struct kfd_process *p;
+ uint32_t gpuidx;
+ int r;
+
+ p = container_of(prange->svms, struct kfd_process, svms);
+
+ for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) {
+ struct kfd_process_device *pdd;
+ struct amdgpu_device *adev;
+
+ pr_debug("mapping to gpu idx 0x%x\n", gpuidx);
+ pdd = kfd_process_device_from_gpuidx(p, gpuidx);
+ if (!pdd) {
+ pr_debug("failed to find device idx %d\n", gpuidx);
+ return -EINVAL;
+ }
+ adev = (struct amdgpu_device *)pdd->dev->kgd;
+
+ r = svm_range_dma_map_dev(adev->dev, &prange->dma_addr[gpuidx],
+ hmm_pfns, prange->npages);
+ if (r)
+ break;
+ }
+
+ return r;
+}
+
+static void svm_range_dma_unmap(struct device *dev, dma_addr_t *dma_addr,
+ unsigned long offset, unsigned long npages)
+{
+ enum dma_data_direction dir = DMA_BIDIRECTIONAL;
+ int i;
+
+ if (!dma_addr)
+ return;
+
+ for (i = offset; i < offset + npages; i++) {
+ if (!dma_addr[i] || dma_mapping_error(dev, dma_addr[i]))
+ continue;
+ pr_debug("dma unmapping 0x%llx\n", dma_addr[i] >> PAGE_SHIFT);
+ dma_unmap_page(dev, dma_addr[i], PAGE_SIZE, dir);
+ dma_addr[i] = 0;
+ }
+}
+
+static void svm_range_free_dma_mappings(struct svm_range *prange)
+{
+ struct kfd_process_device *pdd;
+ dma_addr_t *dma_addr;
+ struct device *dev;
+ struct kfd_process *p;
+ uint32_t gpuidx;
+
+ p = container_of(prange->svms, struct kfd_process, svms);
+
+ for (gpuidx = 0; gpuidx < MAX_GPU_INSTANCE; gpuidx++) {
+ dma_addr = prange->dma_addr[gpuidx];
+ if (!dma_addr)
+ continue;
+
+ pdd = kfd_process_device_from_gpuidx(p, gpuidx);
+ if (!pdd) {
+ pr_debug("failed to find device idx %d\n", gpuidx);
+ continue;
+ }
+ dev = &pdd->dev->pdev->dev;
+ svm_range_dma_unmap(dev, dma_addr, 0, prange->npages);
+ kvfree(dma_addr);
+ prange->dma_addr[gpuidx] = NULL;
+ }
+}
+
static void svm_range_free(struct svm_range *prange)
{
pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, prange,
prange->start, prange->last);
+ svm_range_free_dma_mappings(prange);
mutex_destroy(&prange->lock);
kfree(prange);
}
@@ -148,6 +260,15 @@ svm_range *svm_range_new(struct svm_range_list *svms, uint64_t start,
return prange;
}
+static int svm_range_bo_validate(void *param, struct amdgpu_bo *bo)
+{
+ struct ttm_operation_ctx ctx = { false, false };
+
+ amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_VRAM);
+
+ return ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
+}
+
static int
svm_range_check_attr(struct kfd_process *p,
uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs)
@@ -290,6 +411,61 @@ svm_range_is_same_attrs(struct svm_range *old, struct svm_range *new)
old->granularity == new->granularity);
}
+static int
+svm_range_split_array(void *ppnew, void *ppold, size_t size,
+ uint64_t old_start, uint64_t old_n,
+ uint64_t new_start, uint64_t new_n)
+{
+ unsigned char *new, *old, *pold;
+ uint64_t d;
+
+ if (!ppold)
+ return 0;
+ pold = *(unsigned char **)ppold;
+ if (!pold)
+ return 0;
+
+ new = kvmalloc_array(new_n, size, GFP_KERNEL);
+ if (!new)
+ return -ENOMEM;
+
+ d = (new_start - old_start) * size;
+ memcpy(new, pold + d, new_n * size);
+
+ old = kvmalloc_array(old_n, size, GFP_KERNEL);
+ if (!old) {
+ kvfree(new);
+ return -ENOMEM;
+ }
+
+ d = (new_start == old_start) ? new_n * size : 0;
+ memcpy(old, pold + d, old_n * size);
+
+ kvfree(pold);
+ *(void **)ppold = old;
+ *(void **)ppnew = new;
+
+ return 0;
+}
+
+static int
+svm_range_split_pages(struct svm_range *new, struct svm_range *old,
+ uint64_t start, uint64_t last)
+{
+ uint64_t npages = last - start + 1;
+ int i, r;
+
+ for (i = 0; i < MAX_GPU_INSTANCE; i++) {
+ r = svm_range_split_array(&new->dma_addr[i], &old->dma_addr[i],
+ sizeof(*old->dma_addr[i]), old->start,
+ npages, new->start, new->npages);
+ if (r)
+ return r;
+ }
+
+ return 0;
+}
+
/**
* svm_range_split_adjust - split range and adjust
*
@@ -298,7 +474,7 @@ svm_range_is_same_attrs(struct svm_range *old, struct svm_range *new)
* @start: the old range adjust to start address in pages
* @last: the old range adjust to last address in pages
*
- * Copy attributes in old range to new
+ * Copy system memory dma_addr in old range to new
* range from new_start up to size new->npages, the remaining old range is from
* start to last
*
@@ -309,6 +485,8 @@ static int
svm_range_split_adjust(struct svm_range *new, struct svm_range *old,
uint64_t start, uint64_t last)
{
+ int r;
+
pr_debug("svms 0x%p new 0x%lx old [0x%lx 0x%lx] => [0x%llx 0x%llx]\n",
new->svms, new->start, old->start, old->last, start, last);
@@ -318,6 +496,10 @@ svm_range_split_adjust(struct svm_range *new, struct svm_range *old,
return -EINVAL;
}
+ r = svm_range_split_pages(new, old, start, last);
+ if (r)
+ return r;
+
old->npages = last - start + 1;
old->start = start;
old->last = last;
@@ -426,6 +608,249 @@ svm_range_add_child(struct svm_range *prange, struct mm_struct *mm,
list_add_tail(&pchild->child_list, &prange->child_list);
}
+static uint64_t
+svm_range_get_pte_flags(struct amdgpu_device *adev, struct svm_range *prange)
+{
+ uint32_t flags = prange->flags;
+ uint32_t mapping_flags;
+ uint64_t pte_flags;
+
+ pte_flags = AMDGPU_PTE_VALID;
+ pte_flags |= AMDGPU_PTE_SYSTEM | AMDGPU_PTE_SNOOPED;
+
+ mapping_flags = AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_PAGE_WRITEABLE;
+
+ if (flags & KFD_IOCTL_SVM_FLAG_GPU_RO)
+ mapping_flags &= ~AMDGPU_VM_PAGE_WRITEABLE;
+ if (flags & KFD_IOCTL_SVM_FLAG_GPU_EXEC)
+ mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE;
+ if (flags & KFD_IOCTL_SVM_FLAG_COHERENT)
+ mapping_flags |= AMDGPU_VM_MTYPE_UC;
+ else
+ mapping_flags |= AMDGPU_VM_MTYPE_NC;
+
+ /* TODO: add CHIP_ARCTURUS new flags for vram mapping */
+
+ pte_flags |= amdgpu_gem_va_map_flags(adev, mapping_flags);
+
+ /* Apply ASIC specific mapping flags */
+ amdgpu_gmc_get_vm_pte(adev, &prange->mapping, &pte_flags);
+
+ pr_debug("PTE flags 0x%llx\n", pte_flags);
+
+ return pte_flags;
+}
+
+static int
+svm_range_unmap_from_gpu(struct amdgpu_device *adev, struct amdgpu_vm *vm,
+ uint64_t start, uint64_t last,
+ struct dma_fence **fence)
+{
+ uint64_t init_pte_value = 0;
+
+ pr_debug("[0x%llx 0x%llx]\n", start, last);
+
+ return amdgpu_vm_bo_update_mapping(adev, adev, vm, false, true, NULL,
+ start, last, init_pte_value, 0,
+ NULL, NULL, fence);
+}
+
+static int
+svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
+ unsigned long last)
+{
+ DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE);
+ struct kfd_process_device *pdd;
+ struct dma_fence *fence = NULL;
+ struct amdgpu_device *adev;
+ struct kfd_process *p;
+ uint32_t gpuidx;
+ int r = 0;
+
+ bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip,
+ MAX_GPU_INSTANCE);
+ p = container_of(prange->svms, struct kfd_process, svms);
+
+ for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) {
+ pr_debug("unmap from gpu idx 0x%x\n", gpuidx);
+ pdd = kfd_process_device_from_gpuidx(p, gpuidx);
+ if (!pdd) {
+ pr_debug("failed to find device idx %d\n", gpuidx);
+ return -EINVAL;
+ }
+ adev = (struct amdgpu_device *)pdd->dev->kgd;
+
+ r = svm_range_unmap_from_gpu(adev, pdd->vm, start, last,
+ &fence);
+ if (r)
+ break;
+
+ if (fence) {
+ r = dma_fence_wait(fence, false);
+ dma_fence_put(fence);
+ fence = NULL;
+ if (r)
+ break;
+ }
+ amdgpu_amdkfd_flush_gpu_tlb_pasid((struct kgd_dev *)adev,
+ p->pasid);
+ }
+
+ return r;
+}
+
+static int
+svm_range_map_to_gpu(struct amdgpu_device *adev, struct amdgpu_vm *vm,
+ struct svm_range *prange, dma_addr_t *dma_addr,
+ struct dma_fence **fence)
+{
+ uint64_t pte_flags;
+ int r = 0;
+
+ pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start,
+ prange->last);
+
+ prange->mapping.start = prange->start;
+ prange->mapping.last = prange->last;
+ prange->mapping.offset = 0;
+ pte_flags = svm_range_get_pte_flags(adev, prange);
+
+ r = amdgpu_vm_bo_update_mapping(adev, adev, vm, false, false, NULL,
+ prange->mapping.start,
+ prange->mapping.last, pte_flags,
+ prange->mapping.offset, NULL,
+ dma_addr, &vm->last_update);
+ if (r) {
+ pr_debug("failed %d to map to gpu 0x%lx\n", r, prange->start);
+ goto out;
+ }
+
+ r = amdgpu_vm_update_pdes(adev, vm, false);
+ if (r) {
+ pr_debug("failed %d to update directories 0x%lx\n", r,
+ prange->start);
+ goto out;
+ }
+
+ if (fence)
+ *fence = dma_fence_get(vm->last_update);
+
+out:
+ return r;
+}
+
+static int svm_range_map_to_gpus(struct svm_range *prange,
+ unsigned long *bitmap, bool wait)
+{
+ struct kfd_process_device *pdd;
+ struct amdgpu_device *adev;
+ struct kfd_process *p;
+ struct dma_fence *fence = NULL;
+ uint32_t gpuidx;
+ int r = 0;
+
+ p = container_of(prange->svms, struct kfd_process, svms);
+ for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) {
+ pdd = kfd_process_device_from_gpuidx(p, gpuidx);
+ if (!pdd) {
+ pr_debug("failed to find device idx %d\n", gpuidx);
+ return -EINVAL;
+ }
+ adev = (struct amdgpu_device *)pdd->dev->kgd;
+
+ pdd = kfd_bind_process_to_device(pdd->dev, p);
+ if (IS_ERR(pdd))
+ return -EINVAL;
+
+ r = svm_range_map_to_gpu(adev, pdd->vm, prange,
+ prange->dma_addr[gpuidx],
+ wait ? &fence : NULL);
+ if (r)
+ break;
+
+ if (fence) {
+ r = dma_fence_wait(fence, false);
+ dma_fence_put(fence);
+ fence = NULL;
+ if (r) {
+ pr_debug("failed %d to dma fence wait\n", r);
+ break;
+ }
+ }
+ }
+
+ return r;
+}
+
+struct svm_validate_context {
+ struct kfd_process *process;
+ struct svm_range *prange;
+ bool intr;
+ unsigned long bitmap[MAX_GPU_INSTANCE];
+ struct ttm_validate_buffer tv[MAX_GPU_INSTANCE+1];
+ struct list_head validate_list;
+ struct ww_acquire_ctx ticket;
+};
+
+static int svm_range_reserve_bos(struct svm_validate_context *ctx)
+{
+ struct kfd_process_device *pdd;
+ struct amdgpu_device *adev;
+ struct amdgpu_vm *vm;
+ uint32_t gpuidx;
+ int r;
+
+ INIT_LIST_HEAD(&ctx->validate_list);
+ for_each_set_bit(gpuidx, ctx->bitmap, MAX_GPU_INSTANCE) {
+ pdd = kfd_process_device_from_gpuidx(ctx->process, gpuidx);
+ if (!pdd) {
+ pr_debug("failed to find device idx %d\n", gpuidx);
+ return -EINVAL;
+ }
+ adev = (struct amdgpu_device *)pdd->dev->kgd;
+ vm = pdd->vm;
+
+ ctx->tv[gpuidx].bo = &vm->root.base.bo->tbo;
+ ctx->tv[gpuidx].num_shared = 4;
+ list_add(&ctx->tv[gpuidx].head, &ctx->validate_list);
+ }
+
+ r = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->validate_list,
+ ctx->intr, NULL);
+ if (r) {
+ pr_debug("failed %d to reserve bo\n", r);
+ return r;
+ }
+
+ for_each_set_bit(gpuidx, ctx->bitmap, MAX_GPU_INSTANCE) {
+ pdd = kfd_process_device_from_gpuidx(ctx->process, gpuidx);
+ if (!pdd) {
+ pr_debug("failed to find device idx %d\n", gpuidx);
+ r = -EINVAL;
+ goto unreserve_out;
+ }
+ adev = (struct amdgpu_device *)pdd->dev->kgd;
+
+ r = amdgpu_vm_validate_pt_bos(adev, pdd->vm,
+ svm_range_bo_validate, NULL);
+ if (r) {
+ pr_debug("failed %d validate pt bos\n", r);
+ goto unreserve_out;
+ }
+ }
+
+ return 0;
+
+unreserve_out:
+ ttm_eu_backoff_reservation(&ctx->ticket, &ctx->validate_list);
+ return r;
+}
+
+static void svm_range_unreserve_bos(struct svm_validate_context *ctx)
+{
+ ttm_eu_backoff_reservation(&ctx->ticket, &ctx->validate_list);
+}
+
/*
* Validation+GPU mapping with concurrent invalidation (MMU notifiers)
*
@@ -454,9 +879,27 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
struct svm_range *prange,
uint32_t gpuidx, bool intr, bool wait)
{
+ struct svm_validate_context ctx;
struct hmm_range *hmm_range;
int r = 0;
+ ctx.process = container_of(prange->svms, struct kfd_process, svms);
+ ctx.prange = prange;
+ ctx.intr = intr;
+
+ if (gpuidx < MAX_GPU_INSTANCE) {
+ bitmap_zero(ctx.bitmap, MAX_GPU_INSTANCE);
+ bitmap_set(ctx.bitmap, gpuidx, 1);
+ } else {
+ bitmap_or(ctx.bitmap, prange->bitmap_access,
+ prange->bitmap_aip, MAX_GPU_INSTANCE);
+ }
+
+ if (bitmap_empty(ctx.bitmap, MAX_GPU_INSTANCE))
+ return 0;
+
+ svm_range_reserve_bos(&ctx);
+
if (!prange->actual_loc) {
r = amdgpu_hmm_range_get_pages(&prange->notifier, mm, NULL,
prange->start << PAGE_SHIFT,
@@ -466,6 +909,13 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
pr_debug("failed %d to get svm range pages\n", r);
goto unreserve_out;
}
+
+ r = svm_range_dma_map(prange, ctx.bitmap,
+ hmm_range->hmm_pfns);
+ if (r) {
+ pr_debug("failed %d to dma map range\n", r);
+ goto unreserve_out;
+ }
}
svm_range_lock(prange);
@@ -475,12 +925,17 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
goto unlock_out;
}
}
+ if (!list_empty(&prange->child_list)) {
+ r = -EAGAIN;
+ goto unlock_out;
+ }
- /* TODO: map to GPU */
+ r = svm_range_map_to_gpus(prange, ctx.bitmap, wait);
unlock_out:
svm_range_unlock(prange);
unreserve_out:
+ svm_range_unreserve_bos(&ctx);
return r;
}
@@ -835,6 +1290,7 @@ svm_range_unmap_from_cpu(struct mm_struct *mm, struct svm_range *prange,
struct svm_range_list *svms;
struct svm_range *pchild;
struct kfd_process *p;
+ unsigned long s, l;
bool unmap_parent;
p = kfd_lookup_process_by_mm(mm);
@@ -847,8 +1303,19 @@ svm_range_unmap_from_cpu(struct mm_struct *mm, struct svm_range *prange,
unmap_parent = start <= prange->start && last >= prange->last;
- list_for_each_entry(pchild, &prange->child_list, child_list)
+ list_for_each_entry(pchild, &prange->child_list, child_list) {
+ mutex_lock_nested(&pchild->lock, 1);
+ s = max(start, pchild->start);
+ l = min(last, pchild->last);
+ if (l >= s)
+ svm_range_unmap_from_gpus(pchild, s, l);
svm_range_unmap_split(mm, prange, pchild, start, last);
+ mutex_unlock(&pchild->lock);
+ }
+ s = max(start, prange->start);
+ l = min(last, prange->last);
+ if (l >= s)
+ svm_range_unmap_from_gpus(prange, s, l);
svm_range_unmap_split(mm, prange, prange, start, last);
if (unmap_parent)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
index aa4430f3fa08..1d89401f16b4 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
@@ -56,7 +56,9 @@ struct svm_work_list_item {
* @update_list:link list node used to add to update_list
* @remove_list:link list node used to add to remove list
* @insert_list:link list node used to add to insert list
+ * @mapping: bo_va mapping structure to create and update GPU page table
* @npages: number of pages
+ * @dma_addr: dma mapping address on each GPU for system memory physical page
* @lock: protect prange start, last, child_list, svm_bo_list
* @saved_flags:save/restore current PF_MEMALLOC flags
* @flags: flags defined as KFD_IOCTL_SVM_FLAG_*
@@ -84,7 +86,9 @@ struct svm_range {
struct list_head update_list;
struct list_head remove_list;
struct list_head insert_list;
+ struct amdgpu_bo_va_mapping mapping;
uint64_t npages;
+ dma_addr_t *dma_addr[MAX_GPU_INSTANCE];
struct mutex lock;
unsigned int saved_flags;
uint32_t flags;
--
2.31.1
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