github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-30 19:21:28 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ubwcp: Add buffer configuration function declarations

Browse Source 
Add the declarations needed for the DMA-BUF heap driver to call into
the UBWC-P driver.

Change-Id: Id1bb19410025b858a2154eae39ac0c28e4d6235c
Signed-off-by: Chris Goldsworthy <quic_cgoldswo@quicinc.com>
This commit is contained in:
Chris Goldsworthy 2022-08-17 17:59:03 -07:00
parent 16b799c886
commit 92276eec13
1 changed files with 61 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
include/linux/ubwcp_dma_heap.h Normal file
View File

@ -0,0 +1,61 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#ifndef __UBWCP_DMA_HEAP_H_
#define __UBWCP_DMA_HEAP_H_
#include <linux/types.h>
#include <linux/dma-buf.h>
/**
*
* Initialize ubwcp buffer for the given dma_buf. This
* initializes ubwcp internal data structures and possibly hw to
* use ubwcp for this buffer.
*
* @param dmabuf : ptr to the buffer to be configured for ubwcp
*
* @return int : 0 on success, otherwise error code
*/
typedef int (*init_buffer)(struct dma_buf *dmabuf);
/**
* Free up ubwcp resources for this buffer.
*
* @param dmabuf : ptr to the dma buf
*
* @return int : 0 on success, otherwise error code
*/
typedef int (*free_buffer)(struct dma_buf *dmabuf);
/**
* Lock buffer for CPU access. This prepares ubwcp hw to allow
* CPU access to the compressed buffer. It will perform
* necessary address translation configuration and cache maintenance ops
* so that CPU can safely access ubwcp buffer, if this call is
* successful.
*
* @param dmabuf : ptr to the dma buf
* @param direction : direction of access
*
* @return int : 0 on success, otherwise error code
*/
typedef int (*lock_buffer)(struct dma_buf *dma_buf, enum dma_data_direction direction);
/**
* Unlock buffer from CPU access. This prepares ubwcp hw to
* safely allow for device access to the compressed buffer including any
* necessary cache maintenance ops. It may also free up certain ubwcp
* resources that could result in error when accessed by CPU in
* unlocked state.
*
* @param dmabuf : ptr to the dma buf
* @param direction : direction of access
*
* @return int : 0 on success, otherwise error code
*/
typedef int (*unlock_buffer)(struct dma_buf *dmabuf, enum dma_data_direction direction);
#endif /* __UBWCP_DMA_HEAP_H_ */