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ANDROID: dma-buf: Add support to get flags associated with a buffer

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Allow kernel clients to get the flags associated with a buffer
that is wrapped by a dma-buf. This information can be used to
communicate the type of memory associated with the
buffer(e.g. uncached vs cached memory).

Bug: 133508579
Test: ion-unit-tests
Change-Id: I82eab8beb738b258616c22a01080615d7ffb6ad5
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Signed-off-by: Sandeep Patil <sspatil@google.com>
This commit is contained in:
Isaac J. Manjarres 2019-06-19 15:37:12 -07:00 committed by Sandeep Patil
parent f57c5b53d9
commit 62dce3567e
2 changed files with 29 additions and 0 deletions
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14
drivers/dma-buf/dma-buf.c
View File

@ -1188,6 +1188,20 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr)
}
EXPORT_SYMBOL_GPL(dma_buf_vunmap);
int dma_buf_get_flags(struct dma_buf *dmabuf, unsigned long *flags)
{
int ret = 0;
if (WARN_ON(!dmabuf) || !flags)
return -EINVAL;
if (dmabuf->ops->get_flags)
ret = dmabuf->ops->get_flags(dmabuf, flags);
return ret;
}
EXPORT_SYMBOL_GPL(dma_buf_get_flags);
#ifdef CONFIG_DEBUG_FS
static int dma_buf_debug_show(struct seq_file *s, void *unused)
{

15
include/linux/dma-buf.h
View File

@ -318,6 +318,20 @@ struct dma_buf_ops {
void *(*vmap)(struct dma_buf *);
void (*vunmap)(struct dma_buf *, void *vaddr);
/**
* @get_flags:
*
* This is called by dma_buf_get_flags and is used to get the buffer's
* flags.
* This callback is optional.
*
* Returns:
*
* 0 on success or a negative error code on failure. On success flags
* will be populated with the buffer's flags.
*/
int (*get_flags)(struct dma_buf *dmabuf, unsigned long *flags);
};
/**
@ -486,4 +500,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
unsigned long);
void *dma_buf_vmap(struct dma_buf *);
void dma_buf_vunmap(struct dma_buf *, void *vaddr);
int dma_buf_get_flags(struct dma_buf *dmabuf, unsigned long *flags);
#endif /* __DMA_BUF_H__ */