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/* SPDX-License-Identifier: GPL-2.0 */
/*
* A simple memory allocator to help allocating reserved memory pools.
*
* Copyright (C) 2022 Google LLC
*/
#ifndef __GCIP_MEM_POOL_H__
#define __GCIP_MEM_POOL_H__
#include <linux/device.h>
#include <linux/genalloc.h>
#include <linux/types.h>
struct gcip_mem_pool {
struct device *dev;
struct gen_pool *gen_pool;
phys_addr_t base_paddr;
size_t granule;
};
/*
* Initializes the memory pool object.
*
* @pool: The memory pool object to be initialized.
* @dev: Used for logging only.
* @base_paddr: The base physical address of the pool. Must be greater than 0 and a multiple of
* @granule.
* @size: The size of the pool. @size should be a multiple of @granule.
* @granule: The granule when invoking the allocator. Should be a power of 2.
*
* Returns 0 on success, a negative errno otherwise.
*
* Call gcip_mem_pool_exit() to release the resources of @pool.
*/
int gcip_mem_pool_init(struct gcip_mem_pool *pool, struct device *dev, phys_addr_t base_paddr,
size_t size, size_t granule);
/*
* Releases resources of @pool.
*
* Note: you must release (by calling gcip_mem_pool_free) all allocations before calling this
* function.
*/
void gcip_mem_pool_exit(struct gcip_mem_pool *pool);
/*
* Allocates and returns the allocated physical address.
*
* @size: Size to be allocated.
*
* Returns the allocated address. Returns 0 on allocation failure.
*/
phys_addr_t gcip_mem_pool_alloc(struct gcip_mem_pool *pool, size_t size);
/*
* Returns the address previously allocated by gcip_mem_pool_alloc().
*
* The size and address must match what previously passed to / returned by gcip_mem_pool_alloc().
*/
void gcip_mem_pool_free(struct gcip_mem_pool *pool, phys_addr_t paddr, size_t size);
/*
* Returns the offset between @paddr and @base_paddr passed to gcip_mem_pool_init().
*
* @paddr must be a value returned by gcip_mem_pool_alloc().
*/
static inline size_t gcip_mem_pool_offset(struct gcip_mem_pool *pool, phys_addr_t paddr)
{
return paddr - pool->base_paddr;
}
#endif /* __GCIP_MEM_POOL_H__ */
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