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Diffstat (limited to 'kernel/ethosu_buffer.h')
-rw-r--r-- | kernel/ethosu_buffer.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/kernel/ethosu_buffer.h b/kernel/ethosu_buffer.h new file mode 100644 index 0000000..14f26c2 --- /dev/null +++ b/kernel/ethosu_buffer.h @@ -0,0 +1,106 @@ +/* + * (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 */ |