drivers/crypto/cavium/zip/zip_mem.c

/***********************license start************************************
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#include <linux/types.h>
#include <linux/vmalloc.h>

#include "common.h"

/**
 * zip_cmd_qbuf_alloc - Allocates a cmd buffer for ZIP Instruction Queue
 * @zip: Pointer to zip device structure
 * @q:   Queue number to allocate bufffer to
 * Return: 0 if successful, -ENOMEM otherwise
 */
int zip_cmd_qbuf_alloc(struct zip_device *zip, int q)
{
	zip->iq[q].sw_head = (u64 *)__get_free_pages((GFP_KERNEL | GFP_DMA),
						get_order(ZIP_CMD_QBUF_SIZE));

	if (!zip->iq[q].sw_head)
		return -ENOMEM;

	memset(zip->iq[q].sw_head, 0, ZIP_CMD_QBUF_SIZE);

	zip_dbg("cmd_qbuf_alloc[%d] Success : %p\n", q, zip->iq[q].sw_head);
	return 0;
}

/**
 * zip_cmd_qbuf_free - Frees the cmd Queue buffer
 * @zip: Pointer to zip device structure
 * @q:   Queue number to free buffer of
 */
void zip_cmd_qbuf_free(struct zip_device *zip, int q)
{
	zip_dbg("Freeing cmd_qbuf 0x%lx\n", zip->iq[q].sw_tail);

	free_pages((u64)zip->iq[q].sw_tail, get_order(ZIP_CMD_QBUF_SIZE));
}

/**
 * zip_data_buf_alloc - Allocates memory for a data bufffer
 * @size:   Size of the buffer to allocate
 * Returns: Pointer to the buffer allocated
 */
u8 *zip_data_buf_alloc(u64 size)
{
	u8 *ptr;

	ptr = (u8 *)__get_free_pages((GFP_KERNEL | GFP_DMA),
					get_order(size));

	if (!ptr)
		return NULL;

	memset(ptr, 0, size);

	zip_dbg("Data buffer allocation success\n");
	return ptr;
}

/**
 * zip_data_buf_free - Frees the memory of a data buffer
 * @ptr:  Pointer to the buffer
 * @size: Buffer size
 */
void zip_data_buf_free(u8 *ptr, u64 size)
{
	zip_dbg("Freeing data buffer 0x%lx\n", ptr);

	free_pages((u64)ptr, get_order(size));
}