Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 62dce356 authored by Isaac J. Manjarres's avatar Isaac J. Manjarres Committed by Sandeep Patil
Browse files

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



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: default avatarIsaac J. Manjarres <isaacm@codeaurora.org>
Signed-off-by: default avatarSandeep Patil <sspatil@google.com>
parent f57c5b53

drivers/dma-buf/dma-buf.c

+14 −0
Original line number Diff line number Diff line
@@ -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)

{

include/linux/dma-buf.h

+15 −0
Original line number Diff line number Diff line
@@ -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__ */