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dma-buf: add DMA_BUF_IOCTL_SYNC_PARTIAL support

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Add DMA_BUF_IOCTL_SYNC_PARTIAL support for user to sync dma-buf with
offset and len.

Change-Id: I03d2d2e10e48d32aa83c31abade57e0931e1be49
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
This commit is contained in:
Jianqun Xu
2021-04-07 10:02:21 +08:00
parent 454d65eb27
commit 0f4763b1c6
2 changed files with 47 additions and 0 deletions
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39
drivers/dma-buf/dma-buf.c
View File

@@ -399,6 +399,7 @@ static long dma_buf_ioctl(struct file *file,
{
struct dma_buf *dmabuf;
struct dma_buf_sync sync;
struct dma_buf_sync_partial sync_p;
enum dma_data_direction dir;
int ret;
@@ -445,6 +446,44 @@ static long dma_buf_ioctl(struct file *file,
case DMA_BUF_SET_NAME_B:
return dma_buf_set_name(dmabuf, (const char __user *)arg);
case DMA_BUF_IOCTL_SYNC_PARTIAL:
if (copy_from_user(&sync_p, (void __user *) arg, sizeof(sync_p)))
return -EFAULT;
if (sync_p.len == 0)
return -EINVAL;
if (sync_p.len > dmabuf->size || sync_p.offset > dmabuf->size - sync_p.len)
return -EINVAL;
if (sync_p.flags & ~DMA_BUF_SYNC_VALID_FLAGS_MASK)
return -EINVAL;
switch (sync_p.flags & DMA_BUF_SYNC_RW) {
case DMA_BUF_SYNC_READ:
dir = DMA_FROM_DEVICE;
break;
case DMA_BUF_SYNC_WRITE:
dir = DMA_TO_DEVICE;
break;
case DMA_BUF_SYNC_RW:
dir = DMA_BIDIRECTIONAL;
break;
default:
return -EINVAL;
}
if (sync_p.flags & DMA_BUF_SYNC_END)
ret = dma_buf_end_cpu_access_partial(dmabuf, dir,
sync_p.offset,
sync_p.len);
else
ret = dma_buf_begin_cpu_access_partial(dmabuf, dir,
sync_p.offset,
sync_p.len);
return ret;
default:
return -ENOTTY;
}

8
include/uapi/linux/dma-buf.h
View File

@@ -49,4 +49,12 @@ struct dma_buf_sync {
#define DMA_BUF_SET_NAME_A _IOW(DMA_BUF_BASE, 1, u32)
#define DMA_BUF_SET_NAME_B _IOW(DMA_BUF_BASE, 1, u64)
struct dma_buf_sync_partial {
__u64 flags;
__u32 offset;
__u32 len;
};
#define DMA_BUF_IOCTL_SYNC_PARTIAL _IOW(DMA_BUF_BASE, 2, struct dma_buf_sync_partial)
#endif