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MA-11994 Add get phys address ioctl to dma-buf. 

Add structure dma_buf_phys to store physical address.
Add DMA_BUF_IOCTL_PHYS to export physical address.

Change-Id: Ib2f24b33462d603f2cbeef975689aaf82447d088
Signed-off-by: ivan.liu <xiaowen.liu@nxp.com>
pull/10/head
ivan.liu 2018-05-07 11:24:26 +08:00 committed by Jason Liu
parent b645137625
commit a61555e63d
2 changed files with 36 additions and 0 deletions
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31
drivers/dma-buf/dma-buf.c
View File

@ -34,6 +34,7 @@
#include <linux/poll.h>
#include <linux/reservation.h>
#include <linux/mm.h>
#include <linux/device.h>
#include <uapi/linux/dma-buf.h>
@ -287,6 +288,36 @@ 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;

5
include/uapi/linux/dma-buf.h
View File

@ -27,6 +27,10 @@ struct dma_buf_sync {
__u64 flags;
};
struct dma_buf_phys {
unsigned long phys;
};
#define DMA_BUF_SYNC_READ (1 << 0)
#define DMA_BUF_SYNC_WRITE (2 << 0)
#define DMA_BUF_SYNC_RW (DMA_BUF_SYNC_READ | DMA_BUF_SYNC_WRITE)
@ -37,5 +41,6 @@ struct dma_buf_sync {
#define DMA_BUF_BASE 'b'
#define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync)
#define DMA_BUF_IOCTL_PHYS _IOW(DMA_BUF_BASE, 1, struct dma_buf_phys)
#endif