diff options
Diffstat (limited to 'drivers/dma-buf/dma-buf.c')
| -rw-r--r-- | drivers/dma-buf/dma-buf.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 16bbc9bc9e6d..5d3127daa84f 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -25,6 +25,7 @@ #include <linux/mm.h> #include <linux/mount.h> #include <linux/pseudo_fs.h> +#include <linux/device.h> #include <uapi/linux/dma-buf.h> #include <uapi/linux/magic.h> @@ -374,6 +375,36 @@ static long dma_buf_ioctl(struct file *file, dmabuf = file->private_data; switch (cmd) { + case DMA_BUF_IOCTL_PHYS: { + struct dma_buf_attachment *attachment = NULL; + struct sg_table *sgt = NULL; + unsigned long phys = 0; + struct device dev; + + if (!dmabuf || IS_ERR(dmabuf)) { + return -EFAULT; + } + memset(&dev, 0, sizeof(dev)); + device_initialize(&dev); + dev.coherent_dma_mask = DMA_BIT_MASK(64); + dev.dma_mask = &dev.coherent_dma_mask; + arch_setup_dma_ops(&dev, 0, 0, NULL, false); + attachment = dma_buf_attach(dmabuf, &dev); + if (!attachment || IS_ERR(attachment)) { + return -EFAULT; + } + + sgt = dma_buf_map_attachment(attachment, DMA_BIDIRECTIONAL); + if (sgt && !IS_ERR(sgt)) { + phys = sg_dma_address(sgt->sgl); + dma_buf_unmap_attachment(attachment, sgt, + DMA_BIDIRECTIONAL); + } + dma_buf_detach(dmabuf, attachment); + if (copy_to_user((void __user *) arg, &phys, sizeof(phys))) + return -EFAULT; + return 0; + } case DMA_BUF_IOCTL_SYNC: if (copy_from_user(&sync, (void __user *) arg, sizeof(sync))) return -EFAULT; |