[PATCH v16 3/4] drm/amdgpu: Add mapping info option for GEM_OP ioctl
Christian König
christian.koenig at amd.com
Tue Aug 26 14:25:48 UTC 2025
On 25.08.25 21:49, David Francis wrote:
> Add new GEM_OP_IOCTL option GET_MAPPING_INFO, which
> returns a list of mappings associated with a given bo, along with
> their positions and offsets.
>
> Signed-off-by: David Francis <David.Francis at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 84 ++++++++++++++++++++++---
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 5 ++
> include/uapi/drm/amdgpu_drm.h | 21 ++++++-
> 3 files changed, 100 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index e6741d6c9a55..86d14f3542e5 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -955,17 +955,34 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
> struct drm_gem_object *gobj;
> struct amdgpu_vm_bo_base *base;
> struct amdgpu_bo *robj;
> + struct drm_exec exec;
> + struct amdgpu_fpriv *fpriv = filp->driver_priv;
> int r;
>
> + if (args->padding)
> + return -EINVAL;
> +
> gobj = drm_gem_object_lookup(filp, args->handle);
> if (!gobj)
> return -ENOENT;
>
> robj = gem_to_amdgpu_bo(gobj);
>
> - r = amdgpu_bo_reserve(robj, false);
> - if (unlikely(r))
> - goto out;
> + drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT |
> + DRM_EXEC_IGNORE_DUPLICATES, 0);
> + drm_exec_until_all_locked(&exec) {
> + r = drm_exec_lock_obj(&exec, gobj);
> + drm_exec_retry_on_contention(&exec);
> + if (r)
> + goto out_exec;
> +
> + if (args->op == AMDGPU_GEM_OP_GET_MAPPING_INFO) {
> + r = amdgpu_vm_lock_pd(&fpriv->vm, &exec, 0);
> + drm_exec_retry_on_contention(&exec);
> + if (r)
> + goto out_exec;
> + }
> + }
>
> switch (args->op) {
> case AMDGPU_GEM_OP_GET_GEM_CREATE_INFO: {
> @@ -976,7 +993,7 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
> info.alignment = robj->tbo.page_alignment << PAGE_SHIFT;
> info.domains = robj->preferred_domains;
> info.domain_flags = robj->flags;
> - amdgpu_bo_unreserve(robj);
> + drm_exec_fini(&exec);
> if (copy_to_user(out, &info, sizeof(info)))
> r = -EFAULT;
> break;
> @@ -985,19 +1002,19 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
> if (drm_gem_is_imported(&robj->tbo.base) &&
> args->value & AMDGPU_GEM_DOMAIN_VRAM) {
> r = -EINVAL;
> - amdgpu_bo_unreserve(robj);
> + drm_exec_fini(&exec);
> break;
That should probably be replaced with a "goto out_exec;"
> }
> if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm)) {
> r = -EPERM;
> - amdgpu_bo_unreserve(robj);
> + drm_exec_fini(&exec);
> break;
Same here.
> }
> for (base = robj->vm_bo; base; base = base->next)
> if (amdgpu_xgmi_same_hive(amdgpu_ttm_adev(robj->tbo.bdev),
> amdgpu_ttm_adev(base->vm->root.bo->tbo.bdev))) {
> r = -EINVAL;
> - amdgpu_bo_unreserve(robj);
> + drm_exec_fini(&exec);
> goto out;
And here.
With that done Reviewed-by: Christian König <christian.koenig at amd.com>
Regards,
Christian.
> }
>
> @@ -1011,17 +1028,66 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
>
> if (robj->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
> amdgpu_vm_bo_invalidate(robj, true);
> + drm_exec_fini(&exec);
> + break;
> + case AMDGPU_GEM_OP_GET_MAPPING_INFO: {
> + struct amdgpu_bo_va *bo_va = amdgpu_vm_bo_find(&fpriv->vm, robj);
> + struct drm_amdgpu_gem_vm_entry *vm_entries;
> + struct amdgpu_bo_va_mapping *mapping;
> + int num_mappings = 0;
> + /*
> + * num_entries is set as an input to the size of the user-allocated array of
> + * drm_amdgpu_gem_vm_entry stored at args->value.
> + * num_entries is sent back as output as the number of mappings the bo has.
> + * If that number is larger than the size of the array, the ioctl must
> + * be retried.
> + */
> + vm_entries = kvcalloc(args->num_entries, sizeof(*vm_entries), GFP_KERNEL);
> + if (!vm_entries)
> + return -ENOMEM;
> +
> + amdgpu_vm_bo_va_for_each_valid_mapping(bo_va, mapping) {
> + if (num_mappings < args->num_entries) {
> + vm_entries[num_mappings].addr = mapping->start * AMDGPU_GPU_PAGE_SIZE;
> + vm_entries[num_mappings].size = (mapping->last - mapping->start + 1) * AMDGPU_GPU_PAGE_SIZE;
> + vm_entries[num_mappings].offset = mapping->offset;
> + vm_entries[num_mappings].flags = mapping->flags;
> + }
> + num_mappings += 1;
> + }
> +
> + amdgpu_vm_bo_va_for_each_invalid_mapping(bo_va, mapping) {
> + if (num_mappings < args->num_entries) {
> + vm_entries[num_mappings].addr = mapping->start * AMDGPU_GPU_PAGE_SIZE;
> + vm_entries[num_mappings].size = (mapping->last - mapping->start + 1) * AMDGPU_GPU_PAGE_SIZE;
> + vm_entries[num_mappings].offset = mapping->offset;
> + vm_entries[num_mappings].flags = mapping->flags;
> + }
> + num_mappings += 1;
> + }
>
> - amdgpu_bo_unreserve(robj);
> + drm_exec_fini(&exec);
> +
> + if (num_mappings > 0 && num_mappings <= args->num_entries)
> + r = copy_to_user(u64_to_user_ptr(args->value), vm_entries, num_mappings * sizeof(*vm_entries));
> +
> + args->num_entries = num_mappings;
> +
> + kvfree(vm_entries);
> break;
> + }
> default:
> - amdgpu_bo_unreserve(robj);
> + drm_exec_fini(&exec);
> r = -EINVAL;
> }
>
> out:
> drm_gem_object_put(gobj);
> return r;
> +out_exec:
> + drm_exec_fini(&exec);
> + drm_gem_object_put(gobj);
> + return r;
> }
>
> /**
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index f9549f6b3d1f..5a63ae490b0e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -668,4 +668,9 @@ void amdgpu_vm_tlb_fence_create(struct amdgpu_device *adev,
> struct amdgpu_vm *vm,
> struct dma_fence **fence);
>
> +#define amdgpu_vm_bo_va_for_each_valid_mapping(bo_va, mapping) \
> + list_for_each_entry(mapping, &bo_va->valids, list)
> +#define amdgpu_vm_bo_va_for_each_invalid_mapping(bo_va, mapping) \
> + list_for_each_entry(mapping, &bo_va->invalids, list)
> +
> #endif
> diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
> index 902e30263fcc..9cebd072a042 100644
> --- a/include/uapi/drm/amdgpu_drm.h
> +++ b/include/uapi/drm/amdgpu_drm.h
> @@ -802,6 +802,21 @@ union drm_amdgpu_wait_fences {
>
> #define AMDGPU_GEM_OP_GET_GEM_CREATE_INFO 0
> #define AMDGPU_GEM_OP_SET_PLACEMENT 1
> +#define AMDGPU_GEM_OP_GET_MAPPING_INFO 2
> +
> +struct drm_amdgpu_gem_vm_entry {
> + /* Start of mapping (in bytes) */
> + __u64 addr;
> +
> + /* Size of mapping (in bytes) */
> + __u64 size;
> +
> + /* Mapping offset */
> + __u64 offset;
> +
> + /* flags needed to recreate mapping */
> + __u64 flags;
> +};
>
> /* Sets or returns a value associated with a buffer. */
> struct drm_amdgpu_gem_op {
> @@ -809,8 +824,12 @@ struct drm_amdgpu_gem_op {
> __u32 handle;
> /** AMDGPU_GEM_OP_* */
> __u32 op;
> - /** Input or return value */
> + /** Input or return value. For MAPPING_INFO op: pointer to array of struct drm_amdgpu_gem_vm_entry */
> __u64 value;
> + /** For MAPPING_INFO op: number of mappings (in/out) */
> + __u32 num_entries;
> +
> + __u32 padding;
> };
>
> #define AMDGPU_GEM_LIST_HANDLES_FLAG_IS_IMPORT (1 << 0)
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