You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.7 KiB
91 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* The shared memory system is an allocate-only heap structure that
|
|
* consists of one of more memory areas that can be accessed by the processors
|
|
* in the SoC.
|
|
*
|
|
* Allocation can be done globally for all processors or to an individual processor.
|
|
* This is controlled by the @host parameter.
|
|
*
|
|
* Allocation and management of heap can be implemented in various ways,
|
|
* The @item parameter should be used as an index/hash to the memory region.
|
|
*
|
|
* Copyright (c) 2018 Ramon Fried <ramon.fried@gmail.com>
|
|
*/
|
|
|
|
#ifndef _smemh_
|
|
#define _smemh_
|
|
|
|
/* struct smem_ops: Operations for the SMEM uclass */
|
|
struct smem_ops {
|
|
/**
|
|
* alloc() - allocate space for a smem item
|
|
*
|
|
* @host: remote processor id, or -1 for all processors.
|
|
* @item: smem item handle
|
|
* @size: number of bytes to be allocated
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*alloc)(unsigned int host,
|
|
unsigned int item, size_t size);
|
|
|
|
/**
|
|
* get() - Resolve ptr of size of a smem item
|
|
*
|
|
* @host: the remote processor, of -1 for all processors.
|
|
* @item: smem item handle
|
|
* @size: pointer to be filled out with the size of the item
|
|
* @return pointer on success, NULL on error
|
|
*/
|
|
void *(*get)(unsigned int host,
|
|
unsigned int item, size_t *size);
|
|
|
|
/**
|
|
* get_free_space() - Get free space in smem in bytes
|
|
*
|
|
* @host: the remote processor identifying a partition, or -1
|
|
* for all processors.
|
|
* @return free space, -ve on error
|
|
*/
|
|
int (*get_free_space)(unsigned int host);
|
|
};
|
|
|
|
#define smem_get_ops(dev) ((struct smem_ops *)(dev)->driver->ops)
|
|
|
|
/**
|
|
* smem_alloc() - allocate space for a smem item
|
|
* @host: remote processor id, or -1
|
|
* @item: smem item handle
|
|
* @size: number of bytes to be allocated
|
|
* Return: 0 if OK, -ve on error
|
|
*
|
|
* Allocate space for a given smem item of size @size, given that the item is
|
|
* not yet allocated.
|
|
*/
|
|
int smem_alloc(struct udevice *dev, unsigned int host, unsigned int item, size_t size);
|
|
|
|
/**
|
|
* smem_get() - resolve ptr of size of a smem item
|
|
* @host: the remote processor, or -1 for all processors.
|
|
* @item: smem item handle
|
|
* @size: pointer to be filled out with size of the item
|
|
* Return: pointer on success, NULL on error
|
|
*
|
|
* Looks up smem item and returns pointer to it. Size of smem
|
|
* item is returned in @size.
|
|
*/
|
|
void *smem_get(struct udevice *dev, unsigned int host, unsigned int item, size_t *size);
|
|
|
|
/**
|
|
* smem_get_free_space() - retrieve amount of free space in a partition
|
|
* @host: the remote processor identifying a partition, or -1
|
|
* for all processors.
|
|
* Return: size in bytes, -ve on error
|
|
*
|
|
* To be used by smem clients as a quick way to determine if any new
|
|
* allocations has been made.
|
|
*/
|
|
int smem_get_free_space(struct udevice *dev, unsigned int host);
|
|
|
|
#endif /* _smem_h_ */
|