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/*
* (C) COPYRIGHT 2020 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#ifndef ETHOSU_BUFFER_H
#define ETHOSU_BUFFER_H
/****************************************************************************
* Includes
****************************************************************************/
#include <linux/kref.h>
#include <linux/types.h>
/****************************************************************************
* Types
****************************************************************************/
struct ethosu_device;
struct device;
/**
* struct ethosu_buffer - Buffer
* @dev: Device
* @file: File
* @kref: Reference counting
* @capacity: Maximum capacity of the buffer
* @offset: Offset to first byte of buffer
* @size: Size of the data in the buffer
* @cpu_addr: Kernel mapped address
* @dma_addr: DMA address
* @dma_addr_orig: Original DMA address before range mapping
*
* 'offset + size' must not be larger than 'capacity'.
*/
struct ethosu_buffer {
struct ethosu_device *edev;
struct file *file;
struct kref kref;
size_t capacity;
size_t offset;
size_t size;
void *cpu_addr;
dma_addr_t dma_addr;
dma_addr_t dma_addr_orig;
};
/****************************************************************************
* Functions
****************************************************************************/
/**
* ethosu_buffer_create() - Create buffer
*
* This function must be called in the context of a user space process.
*
* Return: fd on success, else error code.
*/
int ethosu_buffer_create(struct ethosu_device *edev,
size_t capacity);
/**
* ethosu_buffer_get_from_fd() - Get buffer handle from fd
*
* This function must be called from a user space context.
*
* Return: Pointer on success, else ERR_PTR.
*/
struct ethosu_buffer *ethosu_buffer_get_from_fd(int fd);
/**
* ethosu_buffer_get() - Put buffer
*/
void ethosu_buffer_get(struct ethosu_buffer *buf);
/**
* ethosu_buffer_put() - Put buffer
*/
void ethosu_buffer_put(struct ethosu_buffer *buf);
/**
* ethosu_buffer_resize() - Resize and validate buffer
*
* Return: 0 on success, else error code.
*/
int ethosu_buffer_resize(struct ethosu_buffer *buf,
size_t size,
size_t offset);
#endif /* ETHOSU_BUFFER_H */
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