[PATCH V2] accel/amdxdna: Support user space allocated buffer

[PATCH V2] accel/amdxdna: Support user space allocated buffer

[Lizhi Hou]

Enhance DRM_IOCTL_AMDXDNA_CREATE_BO to accept user space allocated
buffer pointer. The buffer pages will be pinned in memory. Unless
the CAP_IPC_LOCK is enabled for the application process, the total
pinned memory can not beyond rlimit_memlock.

Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
---
 drivers/accel/amdxdna/Makefile       |   1 +
 drivers/accel/amdxdna/amdxdna_gem.c  | 139 +++++++++++++---
 drivers/accel/amdxdna/amdxdna_ubuf.c | 232 +++++++++++++++++++++++++++
 drivers/accel/amdxdna/amdxdna_ubuf.h |  19 +++
 include/uapi/drm/amdxdna_accel.h     |  25 +++
 5 files changed, 391 insertions(+), 25 deletions(-)
 create mode 100644 drivers/accel/amdxdna/amdxdna_ubuf.c
 create mode 100644 drivers/accel/amdxdna/amdxdna_ubuf.h

diff --git a/drivers/accel/amdxdna/Makefile b/drivers/accel/amdxdna/Makefile
index 0e9adf6890a0..6797dac65efa 100644
--- a/drivers/accel/amdxdna/Makefile
+++ b/drivers/accel/amdxdna/Makefile
@@ -15,6 +15,7 @@ amdxdna-y := \
 	amdxdna_mailbox_helper.o \
 	amdxdna_pci_drv.o \
 	amdxdna_sysfs.o \
+	amdxdna_ubuf.o \
 	npu1_regs.o \
 	npu2_regs.o \
 	npu4_regs.o \
diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c
index 0f85a0105178..d407a36eb412 100644
--- a/drivers/accel/amdxdna/amdxdna_gem.c
+++ b/drivers/accel/amdxdna/amdxdna_gem.c
@@ -18,6 +18,7 @@
 #include "amdxdna_ctx.h"
 #include "amdxdna_gem.h"
 #include "amdxdna_pci_drv.h"
+#include "amdxdna_ubuf.h"
 
 #define XDNA_MAX_CMD_BO_SIZE	SZ_32K
 
@@ -296,7 +297,7 @@ static int amdxdna_insert_pages(struct amdxdna_gem_obj *abo,
 
 	vma->vm_private_data = NULL;
 	vma->vm_ops = NULL;
-	ret = dma_buf_mmap(to_gobj(abo)->dma_buf, vma, 0);
+	ret = dma_buf_mmap(abo->dma_buf, vma, 0);
 	if (ret) {
 		XDNA_ERR(xdna, "Failed to mmap dma buf %d", ret);
 		return ret;
@@ -391,10 +392,47 @@ static const struct dma_buf_ops amdxdna_dmabuf_ops = {
 	.vunmap = drm_gem_dmabuf_vunmap,
 };
 
+static int amdxdna_gem_obj_vmap(struct drm_gem_object *obj, struct iosys_map *map)
+{
+	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
+
+	iosys_map_clear(map);
+
+	dma_resv_assert_held(obj->resv);
+
+	if (is_import_bo(abo))
+		dma_buf_vmap(abo->dma_buf, map);
+	else
+		drm_gem_shmem_object_vmap(obj, map);
+
+	if (!map->vaddr)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void amdxdna_gem_obj_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
+{
+	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
+
+	dma_resv_assert_held(obj->resv);
+
+	if (is_import_bo(abo))
+		dma_buf_vunmap(abo->dma_buf, map);
+	else
+		drm_gem_shmem_object_vunmap(obj, map);
+}
+
 static struct dma_buf *amdxdna_gem_prime_export(struct drm_gem_object *gobj, int flags)
 {
+	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
 	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 
+	if (abo->dma_buf) {
+		get_dma_buf(abo->dma_buf);
+		return abo->dma_buf;
+	}
+
 	exp_info.ops = &amdxdna_dmabuf_ops;
 	exp_info.size = gobj->size;
 	exp_info.flags = flags;
@@ -451,8 +489,8 @@ static const struct drm_gem_object_funcs amdxdna_gem_shmem_funcs = {
 	.pin = drm_gem_shmem_object_pin,
 	.unpin = drm_gem_shmem_object_unpin,
 	.get_sg_table = drm_gem_shmem_object_get_sg_table,
-	.vmap = drm_gem_shmem_object_vmap,
-	.vunmap = drm_gem_shmem_object_vunmap,
+	.vmap = amdxdna_gem_obj_vmap,
+	.vunmap = amdxdna_gem_obj_vunmap,
 	.mmap = amdxdna_gem_obj_mmap,
 	.vm_ops = &drm_gem_shmem_vm_ops,
 	.export = amdxdna_gem_prime_export,
@@ -494,6 +532,68 @@ amdxdna_gem_create_object_cb(struct drm_device *dev, size_t size)
 	return to_gobj(abo);
 }
 
+static struct amdxdna_gem_obj *
+amdxdna_gem_create_shmem_object(struct drm_device *dev, size_t size)
+{
+	struct drm_gem_shmem_object *shmem = drm_gem_shmem_create(dev, size);
+
+	if (IS_ERR(shmem))
+		return ERR_CAST(shmem);
+
+	shmem->map_wc = false;
+	return to_xdna_obj(&shmem->base);
+}
+
+static struct amdxdna_gem_obj *
+amdxdna_gem_create_ubuf_object(struct drm_device *dev, struct amdxdna_drm_create_bo *args)
+{
+	struct amdxdna_dev *xdna = to_xdna_dev(dev);
+	enum amdxdna_ubuf_flag flags = 0;
+	struct amdxdna_drm_va_tbl va_tbl;
+	struct drm_gem_object *gobj;
+	struct dma_buf *dma_buf;
+
+	if (copy_from_user(&va_tbl, u64_to_user_ptr(args->vaddr), sizeof(va_tbl))) {
+		XDNA_DBG(xdna, "Access va table failed");
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (va_tbl.num_entries) {
+		if (args->type == AMDXDNA_BO_CMD)
+			flags |= AMDXDNA_UBUF_FLAG_MAP_DMA;
+
+		dma_buf = amdxdna_get_ubuf(dev, flags, va_tbl.num_entries,
+					   u64_to_user_ptr(args->vaddr + sizeof(va_tbl)));
+	} else {
+		dma_buf = dma_buf_get(va_tbl.dmabuf_fd);
+	}
+
+	if (IS_ERR(dma_buf))
+		return ERR_CAST(dma_buf);
+
+	gobj = amdxdna_gem_prime_import(dev, dma_buf);
+	if (IS_ERR(gobj)) {
+		dma_buf_put(dma_buf);
+		return ERR_CAST(gobj);
+	}
+
+	dma_buf_put(dma_buf);
+
+	return to_xdna_obj(gobj);
+}
+
+static struct amdxdna_gem_obj *
+amdxdna_gem_create_object(struct drm_device *dev,
+			  struct amdxdna_drm_create_bo *args)
+{
+	size_t aligned_sz = PAGE_ALIGN(args->size);
+
+	if (args->vaddr)
+		return amdxdna_gem_create_ubuf_object(dev, args);
+
+	return amdxdna_gem_create_shmem_object(dev, aligned_sz);
+}
+
 struct drm_gem_object *
 amdxdna_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf)
 {
@@ -545,16 +645,12 @@ amdxdna_drm_alloc_shmem(struct drm_device *dev,
 			struct drm_file *filp)
 {
 	struct amdxdna_client *client = filp->driver_priv;
-	struct drm_gem_shmem_object *shmem;
 	struct amdxdna_gem_obj *abo;
 
-	shmem = drm_gem_shmem_create(dev, args->size);
-	if (IS_ERR(shmem))
-		return ERR_CAST(shmem);
-
-	shmem->map_wc = false;
+	abo = amdxdna_gem_create_object(dev, args);
+	if (IS_ERR(abo))
+		return ERR_CAST(abo);
 
-	abo = to_xdna_obj(&shmem->base);
 	abo->client = client;
 	abo->type = AMDXDNA_BO_SHMEM;
 
@@ -569,7 +665,6 @@ amdxdna_drm_create_dev_heap(struct drm_device *dev,
 	struct amdxdna_client *client = filp->driver_priv;
 	struct iosys_map map = IOSYS_MAP_INIT_VADDR(NULL);
 	struct amdxdna_dev *xdna = to_xdna_dev(dev);
-	struct drm_gem_shmem_object *shmem;
 	struct amdxdna_gem_obj *abo;
 	int ret;
 
@@ -586,14 +681,12 @@ amdxdna_drm_create_dev_heap(struct drm_device *dev,
 		goto mm_unlock;
 	}
 
-	shmem = drm_gem_shmem_create(dev, args->size);
-	if (IS_ERR(shmem)) {
-		ret = PTR_ERR(shmem);
+	abo = amdxdna_gem_create_object(dev, args);
+	if (IS_ERR(abo)) {
+		ret = PTR_ERR(abo);
 		goto mm_unlock;
 	}
 
-	shmem->map_wc = false;
-	abo = to_xdna_obj(&shmem->base);
 	abo->type = AMDXDNA_BO_DEV_HEAP;
 	abo->client = client;
 	abo->mem.dev_addr = client->xdna->dev_info->dev_mem_base;
@@ -657,7 +750,6 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
 {
 	struct iosys_map map = IOSYS_MAP_INIT_VADDR(NULL);
 	struct amdxdna_dev *xdna = to_xdna_dev(dev);
-	struct drm_gem_shmem_object *shmem;
 	struct amdxdna_gem_obj *abo;
 	int ret;
 
@@ -671,12 +763,9 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
 		return ERR_PTR(-EINVAL);
 	}
 
-	shmem = drm_gem_shmem_create(dev, args->size);
-	if (IS_ERR(shmem))
-		return ERR_CAST(shmem);
-
-	shmem->map_wc = false;
-	abo = to_xdna_obj(&shmem->base);
+	abo = amdxdna_gem_create_object(dev, args);
+	if (IS_ERR(abo))
+		return ERR_CAST(abo);
 
 	abo->type = AMDXDNA_BO_CMD;
 	abo->client = filp->driver_priv;
@@ -691,7 +780,7 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
 	return abo;
 
 release_obj:
-	drm_gem_shmem_free(shmem);
+	drm_gem_object_put(to_gobj(abo));
 	return ERR_PTR(ret);
 }
 
@@ -702,7 +791,7 @@ int amdxdna_drm_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_f
 	struct amdxdna_gem_obj *abo;
 	int ret;
 
-	if (args->flags || args->vaddr || !args->size)
+	if (args->flags)
 		return -EINVAL;
 
 	XDNA_DBG(xdna, "BO arg type %d vaddr 0x%llx size 0x%llx flags 0x%llx",
diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.c b/drivers/accel/amdxdna/amdxdna_ubuf.c
new file mode 100644
index 000000000000..077b2261cf2a
--- /dev/null
+++ b/drivers/accel/amdxdna/amdxdna_ubuf.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025, Advanced Micro Devices, Inc.
+ */
+
+#include <drm/amdxdna_accel.h>
+#include <drm/drm_device.h>
+#include <drm/drm_print.h>
+#include <linux/dma-buf.h>
+#include <linux/pagemap.h>
+#include <linux/vmalloc.h>
+
+#include "amdxdna_pci_drv.h"
+#include "amdxdna_ubuf.h"
+
+struct amdxdna_ubuf_priv {
+	struct page **pages;
+	u64 nr_pages;
+	enum amdxdna_ubuf_flag flags;
+	struct mm_struct *mm;
+};
+
+static struct sg_table *amdxdna_ubuf_map(struct dma_buf_attachment *attach,
+					 enum dma_data_direction direction)
+{
+	struct amdxdna_ubuf_priv *ubuf = attach->dmabuf->priv;
+	struct sg_table *sg;
+	int ret;
+
+	sg = kzalloc(sizeof(*sg), GFP_KERNEL);
+	if (!sg)
+		return ERR_PTR(-ENOMEM);
+
+	ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->nr_pages, 0,
+					ubuf->nr_pages << PAGE_SHIFT, GFP_KERNEL);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (ubuf->flags & AMDXDNA_UBUF_FLAG_MAP_DMA) {
+		ret = dma_map_sgtable(attach->dev, sg, direction, 0);
+		if (ret)
+			return ERR_PTR(ret);
+	}
+
+	return sg;
+}
+
+static void amdxdna_ubuf_unmap(struct dma_buf_attachment *attach,
+			       struct sg_table *sg,
+			       enum dma_data_direction direction)
+{
+	struct amdxdna_ubuf_priv *ubuf = attach->dmabuf->priv;
+
+	if (ubuf->flags & AMDXDNA_UBUF_FLAG_MAP_DMA)
+		dma_unmap_sgtable(attach->dev, sg, direction, 0);
+
+	sg_free_table(sg);
+	kfree(sg);
+}
+
+static void amdxdna_ubuf_release(struct dma_buf *dbuf)
+{
+	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
+
+	unpin_user_pages(ubuf->pages, ubuf->nr_pages);
+	kvfree(ubuf->pages);
+	atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
+	mmdrop(ubuf->mm);
+	kfree(ubuf);
+}
+
+static vm_fault_t amdxdna_ubuf_vm_fault(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct amdxdna_ubuf_priv *ubuf;
+	unsigned long pfn;
+	pgoff_t pgoff;
+
+	ubuf = vma->vm_private_data;
+	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+
+	pfn = page_to_pfn(ubuf->pages[pgoff]);
+	return vmf_insert_pfn(vma, vmf->address, pfn);
+}
+
+static const struct vm_operations_struct amdxdna_ubuf_vm_ops = {
+	.fault = amdxdna_ubuf_vm_fault,
+};
+
+static int amdxdna_ubuf_mmap(struct dma_buf *dbuf, struct vm_area_struct *vma)
+{
+	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
+
+	vma->vm_ops = &amdxdna_ubuf_vm_ops;
+	vma->vm_private_data = ubuf;
+	vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
+
+	return 0;
+}
+
+static int amdxdna_ubuf_vmap(struct dma_buf *dbuf, struct iosys_map *map)
+{
+	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
+	void *kva;
+
+	kva = vmap(ubuf->pages, ubuf->nr_pages, VM_MAP, PAGE_KERNEL);
+	if (!kva)
+		return -EINVAL;
+
+	iosys_map_set_vaddr(map, kva);
+	return 0;
+}
+
+static void amdxdna_ubuf_vunmap(struct dma_buf *dbuf, struct iosys_map *map)
+{
+	vunmap(map->vaddr);
+}
+
+static const struct dma_buf_ops amdxdna_ubuf_dmabuf_ops = {
+	.map_dma_buf = amdxdna_ubuf_map,
+	.unmap_dma_buf = amdxdna_ubuf_unmap,
+	.release = amdxdna_ubuf_release,
+	.mmap = amdxdna_ubuf_mmap,
+	.vmap = amdxdna_ubuf_vmap,
+	.vunmap = amdxdna_ubuf_vunmap,
+};
+
+struct dma_buf *amdxdna_get_ubuf(struct drm_device *dev,
+				 enum amdxdna_ubuf_flag flags,
+				 u32 num_entries, void __user *va_entries)
+{
+	struct amdxdna_dev *xdna = to_xdna_dev(dev);
+	unsigned long lock_limit, new_pinned;
+	struct amdxdna_drm_va_entry *va_ent;
+	struct amdxdna_ubuf_priv *ubuf;
+	u32 npages, start = 0;
+	struct dma_buf *dbuf;
+	int i, ret;
+	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
+
+	if (!can_do_mlock())
+		return ERR_PTR(-EPERM);
+
+	ubuf = kzalloc(sizeof(*ubuf), GFP_KERNEL);
+	if (!ubuf)
+		return ERR_PTR(-ENOMEM);
+
+	ubuf->flags = flags;
+	ubuf->mm = current->mm;
+	mmgrab(ubuf->mm);
+
+	va_ent = kvcalloc(num_entries, sizeof(*va_ent), GFP_KERNEL);
+	if (!va_ent) {
+		ret = -ENOMEM;
+		goto free_ubuf;
+	}
+
+	if (copy_from_user(va_ent, va_entries, sizeof(*va_ent) * num_entries)) {
+		XDNA_DBG(xdna, "Access va entries failed");
+		ret = -EINVAL;
+		goto free_ent;
+	}
+
+	for (i = 0, exp_info.size = 0; i < num_entries; i++) {
+		if (!IS_ALIGNED(va_ent[i].vaddr, PAGE_SIZE) ||
+		    !IS_ALIGNED(va_ent[i].len, PAGE_SIZE)) {
+			XDNA_ERR(xdna, "Invalid address or len %llx, %llx",
+				 va_ent[i].vaddr, va_ent[i].len);
+			ret = -EINVAL;
+			goto free_ent;
+		}
+
+		exp_info.size += va_ent[i].len;
+	}
+
+	ubuf->nr_pages = exp_info.size >> PAGE_SHIFT;
+	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+	new_pinned = atomic64_add_return(ubuf->nr_pages, &ubuf->mm->pinned_vm);
+	if (new_pinned > lock_limit && !capable(CAP_IPC_LOCK)) {
+		XDNA_DBG(xdna, "New pin %ld, limit %ld, cap %d",
+			 new_pinned, lock_limit, capable(CAP_IPC_LOCK));
+		ret = -ENOMEM;
+		goto sub_pin_cnt;
+	}
+
+	ubuf->pages = kvmalloc_array(ubuf->nr_pages, sizeof(*ubuf->pages), GFP_KERNEL);
+	if (!ubuf->pages) {
+		ret = -ENOMEM;
+		goto sub_pin_cnt;
+	}
+
+	for (i = 0; i < num_entries; i++) {
+		npages = va_ent[i].len >> PAGE_SHIFT;
+
+		ret = pin_user_pages_fast(va_ent[i].vaddr, npages,
+					  FOLL_WRITE | FOLL_LONGTERM,
+					  &ubuf->pages[start]);
+		if (ret < 0 || ret != npages) {
+			ret = -ENOMEM;
+			XDNA_ERR(xdna, "Failed to pin pages ret %d", ret);
+			goto destroy_pages;
+		}
+
+		start += ret;
+	}
+
+	exp_info.ops = &amdxdna_ubuf_dmabuf_ops;
+	exp_info.priv = ubuf;
+	exp_info.flags = O_RDWR | O_CLOEXEC;
+
+	dbuf = dma_buf_export(&exp_info);
+	if (IS_ERR(dbuf)) {
+		ret = PTR_ERR(dbuf);
+		goto destroy_pages;
+	}
+	kvfree(va_ent);
+
+	return dbuf;
+
+destroy_pages:
+	if (start)
+		unpin_user_pages(ubuf->pages, start);
+	kvfree(ubuf->pages);
+sub_pin_cnt:
+	atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
+free_ent:
+	kvfree(va_ent);
+free_ubuf:
+	mmdrop(ubuf->mm);
+	kfree(ubuf);
+	return ERR_PTR(ret);
+}
diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.h b/drivers/accel/amdxdna/amdxdna_ubuf.h
new file mode 100644
index 000000000000..e5cb3bdb3ec9
--- /dev/null
+++ b/drivers/accel/amdxdna/amdxdna_ubuf.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2025, Advanced Micro Devices, Inc.
+ */
+#ifndef _AMDXDNA_UBUF_H_
+#define _AMDXDNA_UBUF_H_
+
+#include <drm/drm_device.h>
+#include <linux/dma-buf.h>
+
+enum amdxdna_ubuf_flag {
+	AMDXDNA_UBUF_FLAG_MAP_DMA = 1,
+};
+
+struct dma_buf *amdxdna_get_ubuf(struct drm_device *dev,
+				 enum amdxdna_ubuf_flag flags,
+				 u32 num_entries, void __user *va_entries);
+
+#endif /* _AMDXDNA_UBUF_H_ */
diff --git a/include/uapi/drm/amdxdna_accel.h b/include/uapi/drm/amdxdna_accel.h
index a706ead39082..ce523e9ccc52 100644
--- a/include/uapi/drm/amdxdna_accel.h
+++ b/include/uapi/drm/amdxdna_accel.h
@@ -153,6 +153,31 @@ enum amdxdna_bo_type {
 	AMDXDNA_BO_CMD,
 };
 
+/**
+ * struct amdxdna_drm_va_entry
+ * @vaddr: Virtual address.
+ * @len: Size of entry.
+ */
+struct amdxdna_drm_va_entry {
+	__u64 vaddr;
+	__u64 len;
+};
+
+/**
+ * struct amdxdna_drm_va_tbl
+ * @dmabuf_fd: The fd of dmabuf.
+ * @num_entries: Number of va entries.
+ * @va_entries: Array of va entries.
+ *
+ * The input can be either a dmabuf fd or a virtual address entry table.
+ * When dmabuf_fd is used, num_entries must be zero.
+ */
+struct amdxdna_drm_va_tbl {
+	__s32 dmabuf_fd;
+	__u32 num_entries;
+	struct amdxdna_drm_va_entry va_entries[];
+};
+
 /**
  * struct amdxdna_drm_create_bo - Create a buffer object.
  * @flags: Buffer flags. MBZ.
-- 
2.34.1

Re: [PATCH V2] accel/amdxdna: Support user space allocated buffer

[Jacek Lawrynowicz]

Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>

On 7/16/2025 6:44 PM, Lizhi Hou wrote:
> Enhance DRM_IOCTL_AMDXDNA_CREATE_BO to accept user space allocated
> buffer pointer. The buffer pages will be pinned in memory. Unless
> the CAP_IPC_LOCK is enabled for the application process, the total
> pinned memory can not beyond rlimit_memlock.
> 
> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
> ---
>  drivers/accel/amdxdna/Makefile       |   1 +
>  drivers/accel/amdxdna/amdxdna_gem.c  | 139 +++++++++++++---
>  drivers/accel/amdxdna/amdxdna_ubuf.c | 232 +++++++++++++++++++++++++++
>  drivers/accel/amdxdna/amdxdna_ubuf.h |  19 +++
>  include/uapi/drm/amdxdna_accel.h     |  25 +++
>  5 files changed, 391 insertions(+), 25 deletions(-)
>  create mode 100644 drivers/accel/amdxdna/amdxdna_ubuf.c
>  create mode 100644 drivers/accel/amdxdna/amdxdna_ubuf.h
> 
> diff --git a/drivers/accel/amdxdna/Makefile b/drivers/accel/amdxdna/Makefile
> index 0e9adf6890a0..6797dac65efa 100644
> --- a/drivers/accel/amdxdna/Makefile
> +++ b/drivers/accel/amdxdna/Makefile
> @@ -15,6 +15,7 @@ amdxdna-y := \
>  	amdxdna_mailbox_helper.o \
>  	amdxdna_pci_drv.o \
>  	amdxdna_sysfs.o \
> +	amdxdna_ubuf.o \
>  	npu1_regs.o \
>  	npu2_regs.o \
>  	npu4_regs.o \
> diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c
> index 0f85a0105178..d407a36eb412 100644
> --- a/drivers/accel/amdxdna/amdxdna_gem.c
> +++ b/drivers/accel/amdxdna/amdxdna_gem.c
> @@ -18,6 +18,7 @@
>  #include "amdxdna_ctx.h"
>  #include "amdxdna_gem.h"
>  #include "amdxdna_pci_drv.h"
> +#include "amdxdna_ubuf.h"
>  
>  #define XDNA_MAX_CMD_BO_SIZE	SZ_32K
>  
> @@ -296,7 +297,7 @@ static int amdxdna_insert_pages(struct amdxdna_gem_obj *abo,
>  
>  	vma->vm_private_data = NULL;
>  	vma->vm_ops = NULL;
> -	ret = dma_buf_mmap(to_gobj(abo)->dma_buf, vma, 0);
> +	ret = dma_buf_mmap(abo->dma_buf, vma, 0);
>  	if (ret) {
>  		XDNA_ERR(xdna, "Failed to mmap dma buf %d", ret);
>  		return ret;
> @@ -391,10 +392,47 @@ static const struct dma_buf_ops amdxdna_dmabuf_ops = {
>  	.vunmap = drm_gem_dmabuf_vunmap,
>  };
>  
> +static int amdxdna_gem_obj_vmap(struct drm_gem_object *obj, struct iosys_map *map)
> +{
> +	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
> +
> +	iosys_map_clear(map);
> +
> +	dma_resv_assert_held(obj->resv);
> +
> +	if (is_import_bo(abo))
> +		dma_buf_vmap(abo->dma_buf, map);
> +	else
> +		drm_gem_shmem_object_vmap(obj, map);
> +
> +	if (!map->vaddr)
> +		return -ENOMEM;
> +
> +	return 0;
> +}
> +
> +static void amdxdna_gem_obj_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
> +{
> +	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
> +
> +	dma_resv_assert_held(obj->resv);
> +
> +	if (is_import_bo(abo))
> +		dma_buf_vunmap(abo->dma_buf, map);
> +	else
> +		drm_gem_shmem_object_vunmap(obj, map);
> +}
> +
>  static struct dma_buf *amdxdna_gem_prime_export(struct drm_gem_object *gobj, int flags)
>  {
> +	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
>  	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
>  
> +	if (abo->dma_buf) {
> +		get_dma_buf(abo->dma_buf);
> +		return abo->dma_buf;
> +	}
> +
>  	exp_info.ops = &amdxdna_dmabuf_ops;
>  	exp_info.size = gobj->size;
>  	exp_info.flags = flags;
> @@ -451,8 +489,8 @@ static const struct drm_gem_object_funcs amdxdna_gem_shmem_funcs = {
>  	.pin = drm_gem_shmem_object_pin,
>  	.unpin = drm_gem_shmem_object_unpin,
>  	.get_sg_table = drm_gem_shmem_object_get_sg_table,
> -	.vmap = drm_gem_shmem_object_vmap,
> -	.vunmap = drm_gem_shmem_object_vunmap,
> +	.vmap = amdxdna_gem_obj_vmap,
> +	.vunmap = amdxdna_gem_obj_vunmap,
>  	.mmap = amdxdna_gem_obj_mmap,
>  	.vm_ops = &drm_gem_shmem_vm_ops,
>  	.export = amdxdna_gem_prime_export,
> @@ -494,6 +532,68 @@ amdxdna_gem_create_object_cb(struct drm_device *dev, size_t size)
>  	return to_gobj(abo);
>  }
>  
> +static struct amdxdna_gem_obj *
> +amdxdna_gem_create_shmem_object(struct drm_device *dev, size_t size)
> +{
> +	struct drm_gem_shmem_object *shmem = drm_gem_shmem_create(dev, size);
> +
> +	if (IS_ERR(shmem))
> +		return ERR_CAST(shmem);
> +
> +	shmem->map_wc = false;
> +	return to_xdna_obj(&shmem->base);
> +}
> +
> +static struct amdxdna_gem_obj *
> +amdxdna_gem_create_ubuf_object(struct drm_device *dev, struct amdxdna_drm_create_bo *args)
> +{
> +	struct amdxdna_dev *xdna = to_xdna_dev(dev);
> +	enum amdxdna_ubuf_flag flags = 0;
> +	struct amdxdna_drm_va_tbl va_tbl;
> +	struct drm_gem_object *gobj;
> +	struct dma_buf *dma_buf;
> +
> +	if (copy_from_user(&va_tbl, u64_to_user_ptr(args->vaddr), sizeof(va_tbl))) {
> +		XDNA_DBG(xdna, "Access va table failed");
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	if (va_tbl.num_entries) {
> +		if (args->type == AMDXDNA_BO_CMD)
> +			flags |= AMDXDNA_UBUF_FLAG_MAP_DMA;
> +
> +		dma_buf = amdxdna_get_ubuf(dev, flags, va_tbl.num_entries,
> +					   u64_to_user_ptr(args->vaddr + sizeof(va_tbl)));
> +	} else {
> +		dma_buf = dma_buf_get(va_tbl.dmabuf_fd);
> +	}
> +
> +	if (IS_ERR(dma_buf))
> +		return ERR_CAST(dma_buf);
> +
> +	gobj = amdxdna_gem_prime_import(dev, dma_buf);
> +	if (IS_ERR(gobj)) {
> +		dma_buf_put(dma_buf);
> +		return ERR_CAST(gobj);
> +	}
> +
> +	dma_buf_put(dma_buf);
> +
> +	return to_xdna_obj(gobj);
> +}
> +
> +static struct amdxdna_gem_obj *
> +amdxdna_gem_create_object(struct drm_device *dev,
> +			  struct amdxdna_drm_create_bo *args)
> +{
> +	size_t aligned_sz = PAGE_ALIGN(args->size);
> +
> +	if (args->vaddr)
> +		return amdxdna_gem_create_ubuf_object(dev, args);
> +
> +	return amdxdna_gem_create_shmem_object(dev, aligned_sz);
> +}
> +
>  struct drm_gem_object *
>  amdxdna_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf)
>  {
> @@ -545,16 +645,12 @@ amdxdna_drm_alloc_shmem(struct drm_device *dev,
>  			struct drm_file *filp)
>  {
>  	struct amdxdna_client *client = filp->driver_priv;
> -	struct drm_gem_shmem_object *shmem;
>  	struct amdxdna_gem_obj *abo;
>  
> -	shmem = drm_gem_shmem_create(dev, args->size);
> -	if (IS_ERR(shmem))
> -		return ERR_CAST(shmem);
> -
> -	shmem->map_wc = false;
> +	abo = amdxdna_gem_create_object(dev, args);
> +	if (IS_ERR(abo))
> +		return ERR_CAST(abo);
>  
> -	abo = to_xdna_obj(&shmem->base);
>  	abo->client = client;
>  	abo->type = AMDXDNA_BO_SHMEM;
>  
> @@ -569,7 +665,6 @@ amdxdna_drm_create_dev_heap(struct drm_device *dev,
>  	struct amdxdna_client *client = filp->driver_priv;
>  	struct iosys_map map = IOSYS_MAP_INIT_VADDR(NULL);
>  	struct amdxdna_dev *xdna = to_xdna_dev(dev);
> -	struct drm_gem_shmem_object *shmem;
>  	struct amdxdna_gem_obj *abo;
>  	int ret;
>  
> @@ -586,14 +681,12 @@ amdxdna_drm_create_dev_heap(struct drm_device *dev,
>  		goto mm_unlock;
>  	}
>  
> -	shmem = drm_gem_shmem_create(dev, args->size);
> -	if (IS_ERR(shmem)) {
> -		ret = PTR_ERR(shmem);
> +	abo = amdxdna_gem_create_object(dev, args);
> +	if (IS_ERR(abo)) {
> +		ret = PTR_ERR(abo);
>  		goto mm_unlock;
>  	}
>  
> -	shmem->map_wc = false;
> -	abo = to_xdna_obj(&shmem->base);
>  	abo->type = AMDXDNA_BO_DEV_HEAP;
>  	abo->client = client;
>  	abo->mem.dev_addr = client->xdna->dev_info->dev_mem_base;
> @@ -657,7 +750,6 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
>  {
>  	struct iosys_map map = IOSYS_MAP_INIT_VADDR(NULL);
>  	struct amdxdna_dev *xdna = to_xdna_dev(dev);
> -	struct drm_gem_shmem_object *shmem;
>  	struct amdxdna_gem_obj *abo;
>  	int ret;
>  
> @@ -671,12 +763,9 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
>  		return ERR_PTR(-EINVAL);
>  	}
>  
> -	shmem = drm_gem_shmem_create(dev, args->size);
> -	if (IS_ERR(shmem))
> -		return ERR_CAST(shmem);
> -
> -	shmem->map_wc = false;
> -	abo = to_xdna_obj(&shmem->base);
> +	abo = amdxdna_gem_create_object(dev, args);
> +	if (IS_ERR(abo))
> +		return ERR_CAST(abo);
>  
>  	abo->type = AMDXDNA_BO_CMD;
>  	abo->client = filp->driver_priv;
> @@ -691,7 +780,7 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
>  	return abo;
>  
>  release_obj:
> -	drm_gem_shmem_free(shmem);
> +	drm_gem_object_put(to_gobj(abo));
>  	return ERR_PTR(ret);
>  }
>  
> @@ -702,7 +791,7 @@ int amdxdna_drm_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_f
>  	struct amdxdna_gem_obj *abo;
>  	int ret;
>  
> -	if (args->flags || args->vaddr || !args->size)
> +	if (args->flags)
>  		return -EINVAL;
>  
>  	XDNA_DBG(xdna, "BO arg type %d vaddr 0x%llx size 0x%llx flags 0x%llx",
> diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.c b/drivers/accel/amdxdna/amdxdna_ubuf.c
> new file mode 100644
> index 000000000000..077b2261cf2a
> --- /dev/null
> +++ b/drivers/accel/amdxdna/amdxdna_ubuf.c
> @@ -0,0 +1,232 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2025, Advanced Micro Devices, Inc.
> + */
> +
> +#include <drm/amdxdna_accel.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_print.h>
> +#include <linux/dma-buf.h>
> +#include <linux/pagemap.h>
> +#include <linux/vmalloc.h>
> +
> +#include "amdxdna_pci_drv.h"
> +#include "amdxdna_ubuf.h"
> +
> +struct amdxdna_ubuf_priv {
> +	struct page **pages;
> +	u64 nr_pages;
> +	enum amdxdna_ubuf_flag flags;
> +	struct mm_struct *mm;
> +};
> +
> +static struct sg_table *amdxdna_ubuf_map(struct dma_buf_attachment *attach,
> +					 enum dma_data_direction direction)
> +{
> +	struct amdxdna_ubuf_priv *ubuf = attach->dmabuf->priv;
> +	struct sg_table *sg;
> +	int ret;
> +
> +	sg = kzalloc(sizeof(*sg), GFP_KERNEL);
> +	if (!sg)
> +		return ERR_PTR(-ENOMEM);
> +
> +	ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->nr_pages, 0,
> +					ubuf->nr_pages << PAGE_SHIFT, GFP_KERNEL);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	if (ubuf->flags & AMDXDNA_UBUF_FLAG_MAP_DMA) {
> +		ret = dma_map_sgtable(attach->dev, sg, direction, 0);
> +		if (ret)
> +			return ERR_PTR(ret);
> +	}
> +
> +	return sg;
> +}
> +
> +static void amdxdna_ubuf_unmap(struct dma_buf_attachment *attach,
> +			       struct sg_table *sg,
> +			       enum dma_data_direction direction)
> +{
> +	struct amdxdna_ubuf_priv *ubuf = attach->dmabuf->priv;
> +
> +	if (ubuf->flags & AMDXDNA_UBUF_FLAG_MAP_DMA)
> +		dma_unmap_sgtable(attach->dev, sg, direction, 0);
> +
> +	sg_free_table(sg);
> +	kfree(sg);
> +}
> +
> +static void amdxdna_ubuf_release(struct dma_buf *dbuf)
> +{
> +	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
> +
> +	unpin_user_pages(ubuf->pages, ubuf->nr_pages);
> +	kvfree(ubuf->pages);
> +	atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
> +	mmdrop(ubuf->mm);
> +	kfree(ubuf);
> +}
> +
> +static vm_fault_t amdxdna_ubuf_vm_fault(struct vm_fault *vmf)
> +{
> +	struct vm_area_struct *vma = vmf->vma;
> +	struct amdxdna_ubuf_priv *ubuf;
> +	unsigned long pfn;
> +	pgoff_t pgoff;
> +
> +	ubuf = vma->vm_private_data;
> +	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
> +
> +	pfn = page_to_pfn(ubuf->pages[pgoff]);
> +	return vmf_insert_pfn(vma, vmf->address, pfn);
> +}
> +
> +static const struct vm_operations_struct amdxdna_ubuf_vm_ops = {
> +	.fault = amdxdna_ubuf_vm_fault,
> +};
> +
> +static int amdxdna_ubuf_mmap(struct dma_buf *dbuf, struct vm_area_struct *vma)
> +{
> +	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
> +
> +	vma->vm_ops = &amdxdna_ubuf_vm_ops;
> +	vma->vm_private_data = ubuf;
> +	vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
> +
> +	return 0;
> +}
> +
> +static int amdxdna_ubuf_vmap(struct dma_buf *dbuf, struct iosys_map *map)
> +{
> +	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
> +	void *kva;
> +
> +	kva = vmap(ubuf->pages, ubuf->nr_pages, VM_MAP, PAGE_KERNEL);
> +	if (!kva)
> +		return -EINVAL;
> +
> +	iosys_map_set_vaddr(map, kva);
> +	return 0;
> +}
> +
> +static void amdxdna_ubuf_vunmap(struct dma_buf *dbuf, struct iosys_map *map)
> +{
> +	vunmap(map->vaddr);
> +}
> +
> +static const struct dma_buf_ops amdxdna_ubuf_dmabuf_ops = {
> +	.map_dma_buf = amdxdna_ubuf_map,
> +	.unmap_dma_buf = amdxdna_ubuf_unmap,
> +	.release = amdxdna_ubuf_release,
> +	.mmap = amdxdna_ubuf_mmap,
> +	.vmap = amdxdna_ubuf_vmap,
> +	.vunmap = amdxdna_ubuf_vunmap,
> +};
> +
> +struct dma_buf *amdxdna_get_ubuf(struct drm_device *dev,
> +				 enum amdxdna_ubuf_flag flags,
> +				 u32 num_entries, void __user *va_entries)
> +{
> +	struct amdxdna_dev *xdna = to_xdna_dev(dev);
> +	unsigned long lock_limit, new_pinned;
> +	struct amdxdna_drm_va_entry *va_ent;
> +	struct amdxdna_ubuf_priv *ubuf;
> +	u32 npages, start = 0;
> +	struct dma_buf *dbuf;
> +	int i, ret;
> +	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
> +
> +	if (!can_do_mlock())
> +		return ERR_PTR(-EPERM);
> +
> +	ubuf = kzalloc(sizeof(*ubuf), GFP_KERNEL);
> +	if (!ubuf)
> +		return ERR_PTR(-ENOMEM);
> +
> +	ubuf->flags = flags;
> +	ubuf->mm = current->mm;
> +	mmgrab(ubuf->mm);
> +
> +	va_ent = kvcalloc(num_entries, sizeof(*va_ent), GFP_KERNEL);
> +	if (!va_ent) {
> +		ret = -ENOMEM;
> +		goto free_ubuf;
> +	}
> +
> +	if (copy_from_user(va_ent, va_entries, sizeof(*va_ent) * num_entries)) {
> +		XDNA_DBG(xdna, "Access va entries failed");
> +		ret = -EINVAL;
> +		goto free_ent;
> +	}
> +
> +	for (i = 0, exp_info.size = 0; i < num_entries; i++) {
> +		if (!IS_ALIGNED(va_ent[i].vaddr, PAGE_SIZE) ||
> +		    !IS_ALIGNED(va_ent[i].len, PAGE_SIZE)) {
> +			XDNA_ERR(xdna, "Invalid address or len %llx, %llx",
> +				 va_ent[i].vaddr, va_ent[i].len);
> +			ret = -EINVAL;
> +			goto free_ent;
> +		}
> +
> +		exp_info.size += va_ent[i].len;
> +	}
> +
> +	ubuf->nr_pages = exp_info.size >> PAGE_SHIFT;
> +	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
> +	new_pinned = atomic64_add_return(ubuf->nr_pages, &ubuf->mm->pinned_vm);
> +	if (new_pinned > lock_limit && !capable(CAP_IPC_LOCK)) {
> +		XDNA_DBG(xdna, "New pin %ld, limit %ld, cap %d",
> +			 new_pinned, lock_limit, capable(CAP_IPC_LOCK));
> +		ret = -ENOMEM;
> +		goto sub_pin_cnt;
> +	}
> +
> +	ubuf->pages = kvmalloc_array(ubuf->nr_pages, sizeof(*ubuf->pages), GFP_KERNEL);
> +	if (!ubuf->pages) {
> +		ret = -ENOMEM;
> +		goto sub_pin_cnt;
> +	}
> +
> +	for (i = 0; i < num_entries; i++) {
> +		npages = va_ent[i].len >> PAGE_SHIFT;
> +
> +		ret = pin_user_pages_fast(va_ent[i].vaddr, npages,
> +					  FOLL_WRITE | FOLL_LONGTERM,
> +					  &ubuf->pages[start]);
> +		if (ret < 0 || ret != npages) {
> +			ret = -ENOMEM;
> +			XDNA_ERR(xdna, "Failed to pin pages ret %d", ret);
> +			goto destroy_pages;
> +		}
> +
> +		start += ret;
> +	}
> +
> +	exp_info.ops = &amdxdna_ubuf_dmabuf_ops;
> +	exp_info.priv = ubuf;
> +	exp_info.flags = O_RDWR | O_CLOEXEC;
> +
> +	dbuf = dma_buf_export(&exp_info);
> +	if (IS_ERR(dbuf)) {
> +		ret = PTR_ERR(dbuf);
> +		goto destroy_pages;
> +	}
> +	kvfree(va_ent);
> +
> +	return dbuf;
> +
> +destroy_pages:
> +	if (start)
> +		unpin_user_pages(ubuf->pages, start);
> +	kvfree(ubuf->pages);
> +sub_pin_cnt:
> +	atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
> +free_ent:
> +	kvfree(va_ent);
> +free_ubuf:
> +	mmdrop(ubuf->mm);
> +	kfree(ubuf);
> +	return ERR_PTR(ret);
> +}
> diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.h b/drivers/accel/amdxdna/amdxdna_ubuf.h
> new file mode 100644
> index 000000000000..e5cb3bdb3ec9
> --- /dev/null
> +++ b/drivers/accel/amdxdna/amdxdna_ubuf.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2025, Advanced Micro Devices, Inc.
> + */
> +#ifndef _AMDXDNA_UBUF_H_
> +#define _AMDXDNA_UBUF_H_
> +
> +#include <drm/drm_device.h>
> +#include <linux/dma-buf.h>
> +
> +enum amdxdna_ubuf_flag {
> +	AMDXDNA_UBUF_FLAG_MAP_DMA = 1,
> +};
> +
> +struct dma_buf *amdxdna_get_ubuf(struct drm_device *dev,
> +				 enum amdxdna_ubuf_flag flags,
> +				 u32 num_entries, void __user *va_entries);
> +
> +#endif /* _AMDXDNA_UBUF_H_ */
> diff --git a/include/uapi/drm/amdxdna_accel.h b/include/uapi/drm/amdxdna_accel.h
> index a706ead39082..ce523e9ccc52 100644
> --- a/include/uapi/drm/amdxdna_accel.h
> +++ b/include/uapi/drm/amdxdna_accel.h
> @@ -153,6 +153,31 @@ enum amdxdna_bo_type {
>  	AMDXDNA_BO_CMD,
>  };
>  
> +/**
> + * struct amdxdna_drm_va_entry
> + * @vaddr: Virtual address.
> + * @len: Size of entry.
> + */
> +struct amdxdna_drm_va_entry {
> +	__u64 vaddr;
> +	__u64 len;
> +};
> +
> +/**
> + * struct amdxdna_drm_va_tbl
> + * @dmabuf_fd: The fd of dmabuf.
> + * @num_entries: Number of va entries.
> + * @va_entries: Array of va entries.
> + *
> + * The input can be either a dmabuf fd or a virtual address entry table.
> + * When dmabuf_fd is used, num_entries must be zero.
> + */
> +struct amdxdna_drm_va_tbl {
> +	__s32 dmabuf_fd;
> +	__u32 num_entries;
> +	struct amdxdna_drm_va_entry va_entries[];
> +};
> +
>  /**
>   * struct amdxdna_drm_create_bo - Create a buffer object.
>   * @flags: Buffer flags. MBZ.

Re: [PATCH V2] accel/amdxdna: Support user space allocated buffer

[Lizhi Hou]

Pushed to drm-misc-next. Thanks.


Lizhi

On 7/22/25 01:22, Jacek Lawrynowicz wrote:
> Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
>
> On 7/16/2025 6:44 PM, Lizhi Hou wrote:
>> Enhance DRM_IOCTL_AMDXDNA_CREATE_BO to accept user space allocated
>> buffer pointer. The buffer pages will be pinned in memory. Unless
>> the CAP_IPC_LOCK is enabled for the application process, the total
>> pinned memory can not beyond rlimit_memlock.
>>
>> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
>> ---
>>   drivers/accel/amdxdna/Makefile       |   1 +
>>   drivers/accel/amdxdna/amdxdna_gem.c  | 139 +++++++++++++---
>>   drivers/accel/amdxdna/amdxdna_ubuf.c | 232 +++++++++++++++++++++++++++
>>   drivers/accel/amdxdna/amdxdna_ubuf.h |  19 +++
>>   include/uapi/drm/amdxdna_accel.h     |  25 +++
>>   5 files changed, 391 insertions(+), 25 deletions(-)
>>   create mode 100644 drivers/accel/amdxdna/amdxdna_ubuf.c
>>   create mode 100644 drivers/accel/amdxdna/amdxdna_ubuf.h
>>
>> diff --git a/drivers/accel/amdxdna/Makefile b/drivers/accel/amdxdna/Makefile
>> index 0e9adf6890a0..6797dac65efa 100644
>> --- a/drivers/accel/amdxdna/Makefile
>> +++ b/drivers/accel/amdxdna/Makefile
>> @@ -15,6 +15,7 @@ amdxdna-y := \
>>   	amdxdna_mailbox_helper.o \
>>   	amdxdna_pci_drv.o \
>>   	amdxdna_sysfs.o \
>> +	amdxdna_ubuf.o \
>>   	npu1_regs.o \
>>   	npu2_regs.o \
>>   	npu4_regs.o \
>> diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c
>> index 0f85a0105178..d407a36eb412 100644
>> --- a/drivers/accel/amdxdna/amdxdna_gem.c
>> +++ b/drivers/accel/amdxdna/amdxdna_gem.c
>> @@ -18,6 +18,7 @@
>>   #include "amdxdna_ctx.h"
>>   #include "amdxdna_gem.h"
>>   #include "amdxdna_pci_drv.h"
>> +#include "amdxdna_ubuf.h"
>>   
>>   #define XDNA_MAX_CMD_BO_SIZE	SZ_32K
>>   
>> @@ -296,7 +297,7 @@ static int amdxdna_insert_pages(struct amdxdna_gem_obj *abo,
>>   
>>   	vma->vm_private_data = NULL;
>>   	vma->vm_ops = NULL;
>> -	ret = dma_buf_mmap(to_gobj(abo)->dma_buf, vma, 0);
>> +	ret = dma_buf_mmap(abo->dma_buf, vma, 0);
>>   	if (ret) {
>>   		XDNA_ERR(xdna, "Failed to mmap dma buf %d", ret);
>>   		return ret;
>> @@ -391,10 +392,47 @@ static const struct dma_buf_ops amdxdna_dmabuf_ops = {
>>   	.vunmap = drm_gem_dmabuf_vunmap,
>>   };
>>   
>> +static int amdxdna_gem_obj_vmap(struct drm_gem_object *obj, struct iosys_map *map)
>> +{
>> +	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
>> +
>> +	iosys_map_clear(map);
>> +
>> +	dma_resv_assert_held(obj->resv);
>> +
>> +	if (is_import_bo(abo))
>> +		dma_buf_vmap(abo->dma_buf, map);
>> +	else
>> +		drm_gem_shmem_object_vmap(obj, map);
>> +
>> +	if (!map->vaddr)
>> +		return -ENOMEM;
>> +
>> +	return 0;
>> +}
>> +
>> +static void amdxdna_gem_obj_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
>> +{
>> +	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
>> +
>> +	dma_resv_assert_held(obj->resv);
>> +
>> +	if (is_import_bo(abo))
>> +		dma_buf_vunmap(abo->dma_buf, map);
>> +	else
>> +		drm_gem_shmem_object_vunmap(obj, map);
>> +}
>> +
>>   static struct dma_buf *amdxdna_gem_prime_export(struct drm_gem_object *gobj, int flags)
>>   {
>> +	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
>>   	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
>>   
>> +	if (abo->dma_buf) {
>> +		get_dma_buf(abo->dma_buf);
>> +		return abo->dma_buf;
>> +	}
>> +
>>   	exp_info.ops = &amdxdna_dmabuf_ops;
>>   	exp_info.size = gobj->size;
>>   	exp_info.flags = flags;
>> @@ -451,8 +489,8 @@ static const struct drm_gem_object_funcs amdxdna_gem_shmem_funcs = {
>>   	.pin = drm_gem_shmem_object_pin,
>>   	.unpin = drm_gem_shmem_object_unpin,
>>   	.get_sg_table = drm_gem_shmem_object_get_sg_table,
>> -	.vmap = drm_gem_shmem_object_vmap,
>> -	.vunmap = drm_gem_shmem_object_vunmap,
>> +	.vmap = amdxdna_gem_obj_vmap,
>> +	.vunmap = amdxdna_gem_obj_vunmap,
>>   	.mmap = amdxdna_gem_obj_mmap,
>>   	.vm_ops = &drm_gem_shmem_vm_ops,
>>   	.export = amdxdna_gem_prime_export,
>> @@ -494,6 +532,68 @@ amdxdna_gem_create_object_cb(struct drm_device *dev, size_t size)
>>   	return to_gobj(abo);
>>   }
>>   
>> +static struct amdxdna_gem_obj *
>> +amdxdna_gem_create_shmem_object(struct drm_device *dev, size_t size)
>> +{
>> +	struct drm_gem_shmem_object *shmem = drm_gem_shmem_create(dev, size);
>> +
>> +	if (IS_ERR(shmem))
>> +		return ERR_CAST(shmem);
>> +
>> +	shmem->map_wc = false;
>> +	return to_xdna_obj(&shmem->base);
>> +}
>> +
>> +static struct amdxdna_gem_obj *
>> +amdxdna_gem_create_ubuf_object(struct drm_device *dev, struct amdxdna_drm_create_bo *args)
>> +{
>> +	struct amdxdna_dev *xdna = to_xdna_dev(dev);
>> +	enum amdxdna_ubuf_flag flags = 0;
>> +	struct amdxdna_drm_va_tbl va_tbl;
>> +	struct drm_gem_object *gobj;
>> +	struct dma_buf *dma_buf;
>> +
>> +	if (copy_from_user(&va_tbl, u64_to_user_ptr(args->vaddr), sizeof(va_tbl))) {
>> +		XDNA_DBG(xdna, "Access va table failed");
>> +		return ERR_PTR(-EINVAL);
>> +	}
>> +
>> +	if (va_tbl.num_entries) {
>> +		if (args->type == AMDXDNA_BO_CMD)
>> +			flags |= AMDXDNA_UBUF_FLAG_MAP_DMA;
>> +
>> +		dma_buf = amdxdna_get_ubuf(dev, flags, va_tbl.num_entries,
>> +					   u64_to_user_ptr(args->vaddr + sizeof(va_tbl)));
>> +	} else {
>> +		dma_buf = dma_buf_get(va_tbl.dmabuf_fd);
>> +	}
>> +
>> +	if (IS_ERR(dma_buf))
>> +		return ERR_CAST(dma_buf);
>> +
>> +	gobj = amdxdna_gem_prime_import(dev, dma_buf);
>> +	if (IS_ERR(gobj)) {
>> +		dma_buf_put(dma_buf);
>> +		return ERR_CAST(gobj);
>> +	}
>> +
>> +	dma_buf_put(dma_buf);
>> +
>> +	return to_xdna_obj(gobj);
>> +}
>> +
>> +static struct amdxdna_gem_obj *
>> +amdxdna_gem_create_object(struct drm_device *dev,
>> +			  struct amdxdna_drm_create_bo *args)
>> +{
>> +	size_t aligned_sz = PAGE_ALIGN(args->size);
>> +
>> +	if (args->vaddr)
>> +		return amdxdna_gem_create_ubuf_object(dev, args);
>> +
>> +	return amdxdna_gem_create_shmem_object(dev, aligned_sz);
>> +}
>> +
>>   struct drm_gem_object *
>>   amdxdna_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf)
>>   {
>> @@ -545,16 +645,12 @@ amdxdna_drm_alloc_shmem(struct drm_device *dev,
>>   			struct drm_file *filp)
>>   {
>>   	struct amdxdna_client *client = filp->driver_priv;
>> -	struct drm_gem_shmem_object *shmem;
>>   	struct amdxdna_gem_obj *abo;
>>   
>> -	shmem = drm_gem_shmem_create(dev, args->size);
>> -	if (IS_ERR(shmem))
>> -		return ERR_CAST(shmem);
>> -
>> -	shmem->map_wc = false;
>> +	abo = amdxdna_gem_create_object(dev, args);
>> +	if (IS_ERR(abo))
>> +		return ERR_CAST(abo);
>>   
>> -	abo = to_xdna_obj(&shmem->base);
>>   	abo->client = client;
>>   	abo->type = AMDXDNA_BO_SHMEM;
>>   
>> @@ -569,7 +665,6 @@ amdxdna_drm_create_dev_heap(struct drm_device *dev,
>>   	struct amdxdna_client *client = filp->driver_priv;
>>   	struct iosys_map map = IOSYS_MAP_INIT_VADDR(NULL);
>>   	struct amdxdna_dev *xdna = to_xdna_dev(dev);
>> -	struct drm_gem_shmem_object *shmem;
>>   	struct amdxdna_gem_obj *abo;
>>   	int ret;
>>   
>> @@ -586,14 +681,12 @@ amdxdna_drm_create_dev_heap(struct drm_device *dev,
>>   		goto mm_unlock;
>>   	}
>>   
>> -	shmem = drm_gem_shmem_create(dev, args->size);
>> -	if (IS_ERR(shmem)) {
>> -		ret = PTR_ERR(shmem);
>> +	abo = amdxdna_gem_create_object(dev, args);
>> +	if (IS_ERR(abo)) {
>> +		ret = PTR_ERR(abo);
>>   		goto mm_unlock;
>>   	}
>>   
>> -	shmem->map_wc = false;
>> -	abo = to_xdna_obj(&shmem->base);
>>   	abo->type = AMDXDNA_BO_DEV_HEAP;
>>   	abo->client = client;
>>   	abo->mem.dev_addr = client->xdna->dev_info->dev_mem_base;
>> @@ -657,7 +750,6 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
>>   {
>>   	struct iosys_map map = IOSYS_MAP_INIT_VADDR(NULL);
>>   	struct amdxdna_dev *xdna = to_xdna_dev(dev);
>> -	struct drm_gem_shmem_object *shmem;
>>   	struct amdxdna_gem_obj *abo;
>>   	int ret;
>>   
>> @@ -671,12 +763,9 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
>>   		return ERR_PTR(-EINVAL);
>>   	}
>>   
>> -	shmem = drm_gem_shmem_create(dev, args->size);
>> -	if (IS_ERR(shmem))
>> -		return ERR_CAST(shmem);
>> -
>> -	shmem->map_wc = false;
>> -	abo = to_xdna_obj(&shmem->base);
>> +	abo = amdxdna_gem_create_object(dev, args);
>> +	if (IS_ERR(abo))
>> +		return ERR_CAST(abo);
>>   
>>   	abo->type = AMDXDNA_BO_CMD;
>>   	abo->client = filp->driver_priv;
>> @@ -691,7 +780,7 @@ amdxdna_drm_create_cmd_bo(struct drm_device *dev,
>>   	return abo;
>>   
>>   release_obj:
>> -	drm_gem_shmem_free(shmem);
>> +	drm_gem_object_put(to_gobj(abo));
>>   	return ERR_PTR(ret);
>>   }
>>   
>> @@ -702,7 +791,7 @@ int amdxdna_drm_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_f
>>   	struct amdxdna_gem_obj *abo;
>>   	int ret;
>>   
>> -	if (args->flags || args->vaddr || !args->size)
>> +	if (args->flags)
>>   		return -EINVAL;
>>   
>>   	XDNA_DBG(xdna, "BO arg type %d vaddr 0x%llx size 0x%llx flags 0x%llx",
>> diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.c b/drivers/accel/amdxdna/amdxdna_ubuf.c
>> new file mode 100644
>> index 000000000000..077b2261cf2a
>> --- /dev/null
>> +++ b/drivers/accel/amdxdna/amdxdna_ubuf.c
>> @@ -0,0 +1,232 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2025, Advanced Micro Devices, Inc.
>> + */
>> +
>> +#include <drm/amdxdna_accel.h>
>> +#include <drm/drm_device.h>
>> +#include <drm/drm_print.h>
>> +#include <linux/dma-buf.h>
>> +#include <linux/pagemap.h>
>> +#include <linux/vmalloc.h>
>> +
>> +#include "amdxdna_pci_drv.h"
>> +#include "amdxdna_ubuf.h"
>> +
>> +struct amdxdna_ubuf_priv {
>> +	struct page **pages;
>> +	u64 nr_pages;
>> +	enum amdxdna_ubuf_flag flags;
>> +	struct mm_struct *mm;
>> +};
>> +
>> +static struct sg_table *amdxdna_ubuf_map(struct dma_buf_attachment *attach,
>> +					 enum dma_data_direction direction)
>> +{
>> +	struct amdxdna_ubuf_priv *ubuf = attach->dmabuf->priv;
>> +	struct sg_table *sg;
>> +	int ret;
>> +
>> +	sg = kzalloc(sizeof(*sg), GFP_KERNEL);
>> +	if (!sg)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->nr_pages, 0,
>> +					ubuf->nr_pages << PAGE_SHIFT, GFP_KERNEL);
>> +	if (ret)
>> +		return ERR_PTR(ret);
>> +
>> +	if (ubuf->flags & AMDXDNA_UBUF_FLAG_MAP_DMA) {
>> +		ret = dma_map_sgtable(attach->dev, sg, direction, 0);
>> +		if (ret)
>> +			return ERR_PTR(ret);
>> +	}
>> +
>> +	return sg;
>> +}
>> +
>> +static void amdxdna_ubuf_unmap(struct dma_buf_attachment *attach,
>> +			       struct sg_table *sg,
>> +			       enum dma_data_direction direction)
>> +{
>> +	struct amdxdna_ubuf_priv *ubuf = attach->dmabuf->priv;
>> +
>> +	if (ubuf->flags & AMDXDNA_UBUF_FLAG_MAP_DMA)
>> +		dma_unmap_sgtable(attach->dev, sg, direction, 0);
>> +
>> +	sg_free_table(sg);
>> +	kfree(sg);
>> +}
>> +
>> +static void amdxdna_ubuf_release(struct dma_buf *dbuf)
>> +{
>> +	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
>> +
>> +	unpin_user_pages(ubuf->pages, ubuf->nr_pages);
>> +	kvfree(ubuf->pages);
>> +	atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
>> +	mmdrop(ubuf->mm);
>> +	kfree(ubuf);
>> +}
>> +
>> +static vm_fault_t amdxdna_ubuf_vm_fault(struct vm_fault *vmf)
>> +{
>> +	struct vm_area_struct *vma = vmf->vma;
>> +	struct amdxdna_ubuf_priv *ubuf;
>> +	unsigned long pfn;
>> +	pgoff_t pgoff;
>> +
>> +	ubuf = vma->vm_private_data;
>> +	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
>> +
>> +	pfn = page_to_pfn(ubuf->pages[pgoff]);
>> +	return vmf_insert_pfn(vma, vmf->address, pfn);
>> +}
>> +
>> +static const struct vm_operations_struct amdxdna_ubuf_vm_ops = {
>> +	.fault = amdxdna_ubuf_vm_fault,
>> +};
>> +
>> +static int amdxdna_ubuf_mmap(struct dma_buf *dbuf, struct vm_area_struct *vma)
>> +{
>> +	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
>> +
>> +	vma->vm_ops = &amdxdna_ubuf_vm_ops;
>> +	vma->vm_private_data = ubuf;
>> +	vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
>> +
>> +	return 0;
>> +}
>> +
>> +static int amdxdna_ubuf_vmap(struct dma_buf *dbuf, struct iosys_map *map)
>> +{
>> +	struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
>> +	void *kva;
>> +
>> +	kva = vmap(ubuf->pages, ubuf->nr_pages, VM_MAP, PAGE_KERNEL);
>> +	if (!kva)
>> +		return -EINVAL;
>> +
>> +	iosys_map_set_vaddr(map, kva);
>> +	return 0;
>> +}
>> +
>> +static void amdxdna_ubuf_vunmap(struct dma_buf *dbuf, struct iosys_map *map)
>> +{
>> +	vunmap(map->vaddr);
>> +}
>> +
>> +static const struct dma_buf_ops amdxdna_ubuf_dmabuf_ops = {
>> +	.map_dma_buf = amdxdna_ubuf_map,
>> +	.unmap_dma_buf = amdxdna_ubuf_unmap,
>> +	.release = amdxdna_ubuf_release,
>> +	.mmap = amdxdna_ubuf_mmap,
>> +	.vmap = amdxdna_ubuf_vmap,
>> +	.vunmap = amdxdna_ubuf_vunmap,
>> +};
>> +
>> +struct dma_buf *amdxdna_get_ubuf(struct drm_device *dev,
>> +				 enum amdxdna_ubuf_flag flags,
>> +				 u32 num_entries, void __user *va_entries)
>> +{
>> +	struct amdxdna_dev *xdna = to_xdna_dev(dev);
>> +	unsigned long lock_limit, new_pinned;
>> +	struct amdxdna_drm_va_entry *va_ent;
>> +	struct amdxdna_ubuf_priv *ubuf;
>> +	u32 npages, start = 0;
>> +	struct dma_buf *dbuf;
>> +	int i, ret;
>> +	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
>> +
>> +	if (!can_do_mlock())
>> +		return ERR_PTR(-EPERM);
>> +
>> +	ubuf = kzalloc(sizeof(*ubuf), GFP_KERNEL);
>> +	if (!ubuf)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	ubuf->flags = flags;
>> +	ubuf->mm = current->mm;
>> +	mmgrab(ubuf->mm);
>> +
>> +	va_ent = kvcalloc(num_entries, sizeof(*va_ent), GFP_KERNEL);
>> +	if (!va_ent) {
>> +		ret = -ENOMEM;
>> +		goto free_ubuf;
>> +	}
>> +
>> +	if (copy_from_user(va_ent, va_entries, sizeof(*va_ent) * num_entries)) {
>> +		XDNA_DBG(xdna, "Access va entries failed");
>> +		ret = -EINVAL;
>> +		goto free_ent;
>> +	}
>> +
>> +	for (i = 0, exp_info.size = 0; i < num_entries; i++) {
>> +		if (!IS_ALIGNED(va_ent[i].vaddr, PAGE_SIZE) ||
>> +		    !IS_ALIGNED(va_ent[i].len, PAGE_SIZE)) {
>> +			XDNA_ERR(xdna, "Invalid address or len %llx, %llx",
>> +				 va_ent[i].vaddr, va_ent[i].len);
>> +			ret = -EINVAL;
>> +			goto free_ent;
>> +		}
>> +
>> +		exp_info.size += va_ent[i].len;
>> +	}
>> +
>> +	ubuf->nr_pages = exp_info.size >> PAGE_SHIFT;
>> +	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
>> +	new_pinned = atomic64_add_return(ubuf->nr_pages, &ubuf->mm->pinned_vm);
>> +	if (new_pinned > lock_limit && !capable(CAP_IPC_LOCK)) {
>> +		XDNA_DBG(xdna, "New pin %ld, limit %ld, cap %d",
>> +			 new_pinned, lock_limit, capable(CAP_IPC_LOCK));
>> +		ret = -ENOMEM;
>> +		goto sub_pin_cnt;
>> +	}
>> +
>> +	ubuf->pages = kvmalloc_array(ubuf->nr_pages, sizeof(*ubuf->pages), GFP_KERNEL);
>> +	if (!ubuf->pages) {
>> +		ret = -ENOMEM;
>> +		goto sub_pin_cnt;
>> +	}
>> +
>> +	for (i = 0; i < num_entries; i++) {
>> +		npages = va_ent[i].len >> PAGE_SHIFT;
>> +
>> +		ret = pin_user_pages_fast(va_ent[i].vaddr, npages,
>> +					  FOLL_WRITE | FOLL_LONGTERM,
>> +					  &ubuf->pages[start]);
>> +		if (ret < 0 || ret != npages) {
>> +			ret = -ENOMEM;
>> +			XDNA_ERR(xdna, "Failed to pin pages ret %d", ret);
>> +			goto destroy_pages;
>> +		}
>> +
>> +		start += ret;
>> +	}
>> +
>> +	exp_info.ops = &amdxdna_ubuf_dmabuf_ops;
>> +	exp_info.priv = ubuf;
>> +	exp_info.flags = O_RDWR | O_CLOEXEC;
>> +
>> +	dbuf = dma_buf_export(&exp_info);
>> +	if (IS_ERR(dbuf)) {
>> +		ret = PTR_ERR(dbuf);
>> +		goto destroy_pages;
>> +	}
>> +	kvfree(va_ent);
>> +
>> +	return dbuf;
>> +
>> +destroy_pages:
>> +	if (start)
>> +		unpin_user_pages(ubuf->pages, start);
>> +	kvfree(ubuf->pages);
>> +sub_pin_cnt:
>> +	atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
>> +free_ent:
>> +	kvfree(va_ent);
>> +free_ubuf:
>> +	mmdrop(ubuf->mm);
>> +	kfree(ubuf);
>> +	return ERR_PTR(ret);
>> +}
>> diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.h b/drivers/accel/amdxdna/amdxdna_ubuf.h
>> new file mode 100644
>> index 000000000000..e5cb3bdb3ec9
>> --- /dev/null
>> +++ b/drivers/accel/amdxdna/amdxdna_ubuf.h
>> @@ -0,0 +1,19 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (C) 2025, Advanced Micro Devices, Inc.
>> + */
>> +#ifndef _AMDXDNA_UBUF_H_
>> +#define _AMDXDNA_UBUF_H_
>> +
>> +#include <drm/drm_device.h>
>> +#include <linux/dma-buf.h>
>> +
>> +enum amdxdna_ubuf_flag {
>> +	AMDXDNA_UBUF_FLAG_MAP_DMA = 1,
>> +};
>> +
>> +struct dma_buf *amdxdna_get_ubuf(struct drm_device *dev,
>> +				 enum amdxdna_ubuf_flag flags,
>> +				 u32 num_entries, void __user *va_entries);
>> +
>> +#endif /* _AMDXDNA_UBUF_H_ */
>> diff --git a/include/uapi/drm/amdxdna_accel.h b/include/uapi/drm/amdxdna_accel.h
>> index a706ead39082..ce523e9ccc52 100644
>> --- a/include/uapi/drm/amdxdna_accel.h
>> +++ b/include/uapi/drm/amdxdna_accel.h
>> @@ -153,6 +153,31 @@ enum amdxdna_bo_type {
>>   	AMDXDNA_BO_CMD,
>>   };
>>   
>> +/**
>> + * struct amdxdna_drm_va_entry
>> + * @vaddr: Virtual address.
>> + * @len: Size of entry.
>> + */
>> +struct amdxdna_drm_va_entry {
>> +	__u64 vaddr;
>> +	__u64 len;
>> +};
>> +
>> +/**
>> + * struct amdxdna_drm_va_tbl
>> + * @dmabuf_fd: The fd of dmabuf.
>> + * @num_entries: Number of va entries.
>> + * @va_entries: Array of va entries.
>> + *
>> + * The input can be either a dmabuf fd or a virtual address entry table.
>> + * When dmabuf_fd is used, num_entries must be zero.
>> + */
>> +struct amdxdna_drm_va_tbl {
>> +	__s32 dmabuf_fd;
>> +	__u32 num_entries;
>> +	struct amdxdna_drm_va_entry va_entries[];
>> +};
>> +
>>   /**
>>    * struct amdxdna_drm_create_bo - Create a buffer object.
>>    * @flags: Buffer flags. MBZ.