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/* SPDX-License-Identifier: GPL-2.0 */
/*
* GCIP helpers for allocating memories.
*
* Copyright (C) 2022 Google LLC
*/
#ifndef __GCIP_ALLOC_HELPER_H__
#define __GCIP_ALLOC_HELPER_H__
#include <linux/device.h>
#include <linux/scatterlist.h>
#include <linux/types.h>
/*
* The actual return value from the alloc_noncontiguous function.
* The user should only care about @sgt. @pages is used internally for freeing memory.
*/
struct gcip_sgt_handle {
struct sg_table sgt;
void *mem;
};
/*
* Allocates non-contiguous memory with size @size bytes.
*
* @dev: pointer to device structure. Is used for logging or the NUMA node for page allocation.
* @size: Total size in bytes. Will be page aligned.
* @gfp: The GFP flag for malloc internal structures.
*
* Returns the SG table represents the non-contiguous region.
* Returns NULL on any error.
*/
struct sg_table *gcip_alloc_noncontiguous(struct device *dev, size_t size, gfp_t gfp);
/* Frees the memory allocated by gcip_alloc_noncontiguous. */
void gcip_free_noncontiguous(struct sg_table *sgt);
/*
* Returns the virtual memory that was used to allocate @sgt.
*
* @sgt must be the return pointer of gcip_alloc_noncontiguous.
*/
static inline void *gcip_noncontiguous_sgt_to_mem(struct sg_table *sgt)
{
struct gcip_sgt_handle *sh = container_of(sgt, struct gcip_sgt_handle, sgt);
return sh->mem;
}
#endif /* __GCIP_ALLOC_HELPER_H__ */
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