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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020-2025 Intel Corporation
*/
#include <linux/dma-buf.h>
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/capability.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include <drm/drm_gem.h>
#include "ivpu_drv.h"
#include "ivpu_gem.h"
static struct sg_table *
ivpu_gem_userptr_dmabuf_map(struct dma_buf_attachment *attachment,
enum dma_data_direction direction)
{
struct sg_table *sgt = attachment->dmabuf->priv;
int ret;
ret = dma_map_sgtable(attachment->dev, sgt, direction, DMA_ATTR_SKIP_CPU_SYNC);
if (ret)
return ERR_PTR(ret);
return sgt;
}
static void ivpu_gem_userptr_dmabuf_unmap(struct dma_buf_attachment *attachment,
struct sg_table *sgt,
enum dma_data_direction direction)
{
dma_unmap_sgtable(attachment->dev, sgt, direction, DMA_ATTR_SKIP_CPU_SYNC);
}
static void ivpu_gem_userptr_dmabuf_release(struct dma_buf *dma_buf)
{
struct sg_table *sgt = dma_buf->priv;
struct sg_page_iter page_iter;
struct page *page;
for_each_sgtable_page(sgt, &page_iter, 0) {
page = sg_page_iter_page(&page_iter);
unpin_user_page(page);
}
sg_free_table(sgt);
kfree(sgt);
}
static const struct dma_buf_ops ivpu_gem_userptr_dmabuf_ops = {
.map_dma_buf = ivpu_gem_userptr_dmabuf_map,
.unmap_dma_buf = ivpu_gem_userptr_dmabuf_unmap,
.release = ivpu_gem_userptr_dmabuf_release,
};
static struct dma_buf *
ivpu_create_userptr_dmabuf(struct ivpu_device *vdev, void __user *user_ptr,
size_t size, uint32_t flags)
{
struct dma_buf_export_info exp_info = {};
struct dma_buf *dma_buf;
struct sg_table *sgt;
struct page **pages;
unsigned long nr_pages = size >> PAGE_SHIFT;
unsigned int gup_flags = FOLL_LONGTERM;
int ret, i, pinned;
/* Add FOLL_WRITE only if the BO is not read-only */
if (!(flags & DRM_IVPU_BO_READ_ONLY))
gup_flags |= FOLL_WRITE;
pages = kvmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL);
if (!pages)
return ERR_PTR(-ENOMEM);
pinned = pin_user_pages_fast((unsigned long)user_ptr, nr_pages, gup_flags, pages);
if (pinned < 0) {
ret = pinned;
ivpu_dbg(vdev, IOCTL, "Failed to pin user pages: %d\n", ret);
goto free_pages_array;
}
if (pinned != nr_pages) {
ivpu_dbg(vdev, IOCTL, "Pinned %d pages, expected %lu\n", pinned, nr_pages);
ret = -EFAULT;
goto unpin_pages;
}
sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt) {
ret = -ENOMEM;
goto unpin_pages;
}
ret = sg_alloc_table_from_pages(sgt, pages, nr_pages, 0, size, GFP_KERNEL);
if (ret) {
ivpu_dbg(vdev, IOCTL, "Failed to create sg table: %d\n", ret);
goto free_sgt;
}
exp_info.exp_name = "ivpu_userptr_dmabuf";
exp_info.owner = THIS_MODULE;
exp_info.ops = &ivpu_gem_userptr_dmabuf_ops;
exp_info.size = size;
exp_info.flags = O_RDWR | O_CLOEXEC;
exp_info.priv = sgt;
dma_buf = dma_buf_export(&exp_info);
if (IS_ERR(dma_buf)) {
ret = PTR_ERR(dma_buf);
ivpu_dbg(vdev, IOCTL, "Failed to export userptr dma-buf: %d\n", ret);
goto free_sg_table;
}
kvfree(pages);
return dma_buf;
free_sg_table:
sg_free_table(sgt);
free_sgt:
kfree(sgt);
unpin_pages:
for (i = 0; i < pinned; i++)
unpin_user_page(pages[i]);
free_pages_array:
kvfree(pages);
return ERR_PTR(ret);
}
static struct ivpu_bo *
ivpu_bo_create_from_userptr(struct ivpu_device *vdev, void __user *user_ptr,
size_t size, uint32_t flags)
{
struct dma_buf *dma_buf;
struct drm_gem_object *obj;
struct ivpu_bo *bo;
dma_buf = ivpu_create_userptr_dmabuf(vdev, user_ptr, size, flags);
if (IS_ERR(dma_buf))
return ERR_CAST(dma_buf);
obj = ivpu_gem_prime_import(&vdev->drm, dma_buf);
if (IS_ERR(obj)) {
dma_buf_put(dma_buf);
return ERR_CAST(obj);
}
dma_buf_put(dma_buf);
bo = to_ivpu_bo(obj);
bo->flags = flags;
return bo;
}
int ivpu_bo_create_from_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
{
struct drm_ivpu_bo_create_from_userptr *args = data;
struct ivpu_file_priv *file_priv = file->driver_priv;
struct ivpu_device *vdev = to_ivpu_device(dev);
void __user *user_ptr = u64_to_user_ptr(args->user_ptr);
struct ivpu_bo *bo;
int ret;
if (args->flags & ~(DRM_IVPU_BO_HIGH_MEM | DRM_IVPU_BO_DMA_MEM | DRM_IVPU_BO_READ_ONLY)) {
ivpu_dbg(vdev, IOCTL, "Invalid BO flags: 0x%x\n", args->flags);
return -EINVAL;
}
if (!args->user_ptr || !args->size) {
ivpu_dbg(vdev, IOCTL, "Userptr or size are zero: ptr %llx size %llu\n",
args->user_ptr, args->size);
return -EINVAL;
}
if (!PAGE_ALIGNED(args->user_ptr) || !PAGE_ALIGNED(args->size)) {
ivpu_dbg(vdev, IOCTL, "Userptr or size not page aligned: ptr %llx size %llu\n",
args->user_ptr, args->size);
return -EINVAL;
}
if (!access_ok(user_ptr, args->size)) {
ivpu_dbg(vdev, IOCTL, "Userptr is not accessible: ptr %llx size %llu\n",
args->user_ptr, args->size);
return -EFAULT;
}
bo = ivpu_bo_create_from_userptr(vdev, user_ptr, args->size, args->flags);
if (IS_ERR(bo))
return PTR_ERR(bo);
ret = drm_gem_handle_create(file, &bo->base.base, &args->handle);
if (ret) {
ivpu_dbg(vdev, IOCTL, "Failed to create handle for BO: %pe ctx %u size %llu flags 0x%x\n",
bo, file_priv->ctx.id, args->size, args->flags);
} else {
ivpu_dbg(vdev, BO, "Created userptr BO: handle=%u vpu_addr=0x%llx size=%llu flags=0x%x\n",
args->handle, bo->vpu_addr, args->size, bo->flags);
args->vpu_addr = bo->vpu_addr;
}
drm_gem_object_put(&bo->base.base);
return ret;
}
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