linux/drivers/crypto/hisilicon/sgl.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 HiSilicon Limited. */
#include <linux/align.h>
#include <linux/dma-mapping.h>
#include <linux/hisi_acc_qm.h>
#include <linux/module.h>
#include <linux/slab.h>

#define HISI_ACC_SGL_SGE_NR_MIN …
#define HISI_ACC_SGL_NR_MAX …
#define HISI_ACC_SGL_ALIGN_SIZE …
#define HISI_ACC_MEM_BLOCK_NR …

struct acc_hw_sge { … };

/* use default sgl head size 64B */
struct hisi_acc_hw_sgl { … } __aligned(…);

struct hisi_acc_sgl_pool { … };

/**
 * hisi_acc_create_sgl_pool() - Create a hw sgl pool.
 * @dev: The device which hw sgl pool belongs to.
 * @count: Count of hisi_acc_hw_sgl in pool.
 * @sge_nr: The count of sge in hw_sgl
 *
 * This function creates a hw sgl pool, after this user can get hw sgl memory
 * from it.
 */
struct hisi_acc_sgl_pool *hisi_acc_create_sgl_pool(struct device *dev,
						   u32 count, u32 sge_nr)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * hisi_acc_free_sgl_pool() - Free a hw sgl pool.
 * @dev: The device which hw sgl pool belongs to.
 * @pool: Pointer of pool.
 *
 * This function frees memory of a hw sgl pool.
 */
void hisi_acc_free_sgl_pool(struct device *dev, struct hisi_acc_sgl_pool *pool)
{ … }
EXPORT_SYMBOL_GPL(…);

static struct hisi_acc_hw_sgl *acc_get_sgl(struct hisi_acc_sgl_pool *pool,
					   u32 index, dma_addr_t *hw_sgl_dma)
{ … }

static void sg_map_to_hw_sg(struct scatterlist *sgl,
			    struct acc_hw_sge *hw_sge)
{ … }

static void inc_hw_sgl_sge(struct hisi_acc_hw_sgl *hw_sgl)
{ … }

static void update_hw_sgl_sum_sge(struct hisi_acc_hw_sgl *hw_sgl, u16 sum)
{ … }

static void clear_hw_sgl_sge(struct hisi_acc_hw_sgl *hw_sgl)
{ … }

/**
 * hisi_acc_sg_buf_map_to_hw_sgl - Map a scatterlist to a hw sgl.
 * @dev: The device which hw sgl belongs to.
 * @sgl: Scatterlist which will be mapped to hw sgl.
 * @pool: Pool which hw sgl memory will be allocated in.
 * @index: Index of hisi_acc_hw_sgl in pool.
 * @hw_sgl_dma: The dma address of allocated hw sgl.
 *
 * This function builds hw sgl according input sgl, user can use hw_sgl_dma
 * as src/dst in its BD. Only support single hw sgl currently.
 */
struct hisi_acc_hw_sgl *
hisi_acc_sg_buf_map_to_hw_sgl(struct device *dev,
			      struct scatterlist *sgl,
			      struct hisi_acc_sgl_pool *pool,
			      u32 index, dma_addr_t *hw_sgl_dma)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * hisi_acc_sg_buf_unmap() - Unmap allocated hw sgl.
 * @dev: The device which hw sgl belongs to.
 * @sgl: Related scatterlist.
 * @hw_sgl: Virtual address of hw sgl.
 *
 * This function unmaps allocated hw sgl.
 */
void hisi_acc_sg_buf_unmap(struct device *dev, struct scatterlist *sgl,
			   struct hisi_acc_hw_sgl *hw_sgl)
{ … }
EXPORT_SYMBOL_GPL(…);