linux/drivers/infiniband/hw/hfi1/efivar.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright(c) 2015, 2016 Intel Corporation.
 */

#include <linux/string.h>
#include <linux/string_helpers.h>

#include "efivar.h"

/* GUID for HFI1 variables in EFI */
#define HFI1_EFIVAR_GUID …
/* largest EFI data size we expect */
#define EFI_DATA_SIZE …

/*
 * Read the named EFI variable.  Return the size of the actual data in *size
 * and a kmalloc'ed buffer in *return_data.  The caller must free the
 * data.  It is guaranteed that *return_data will be NULL and *size = 0
 * if this routine fails.
 *
 * Return 0 on success, -errno on failure.
 */
static int read_efi_var(const char *name, unsigned long *size,
			void **return_data)
{ … }

/*
 * Read an HFI1 EFI variable of the form:
 *	<PCIe address>-<kind>
 * Return an kalloc'ed array and size of the data.
 *
 * Returns 0 on success, -errno on failure.
 */
int read_hfi1_efi_var(struct hfi1_devdata *dd, const char *kind,
		      unsigned long *size, void **return_data)
{ … }