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// SPDX-License-Identifier: GPL-2.0
/**
* imr_selftest.c -- Intel Isolated Memory Region self-test driver
*
* Copyright(c) 2013 Intel Corporation.
* Copyright(c) 2015 Bryan O'Donoghue <pure.logic@nexus-software.ie>
*
* IMR self test. The purpose of this module is to run a set of tests on the
* IMR API to validate it's sanity. We check for overlapping, reserved
* addresses and setup/teardown sanity.
*
*/
#include <asm-generic/sections.h>
#include <asm/cpu_device_id.h>
#include <asm/imr.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/types.h>
#define SELFTEST KBUILD_MODNAME ": "
/**
* imr_self_test_result - Print result string for self test.
*
* @res: result code - true if test passed false otherwise.
* @fmt: format string.
* ... variadic argument list.
*/
static __printf(2, 3)
void __init imr_self_test_result(int res, const char *fmt, ...)
{
va_list vlist;
/* Print pass/fail. */
if (res)
pr_info(SELFTEST "pass ");
else
pr_info(SELFTEST "fail ");
/* Print variable string. */
va_start(vlist, fmt);
vprintk(fmt, vlist);
va_end(vlist);
/* Optional warning. */
WARN(res == 0, "test failed");
}
#undef SELFTEST
/**
* imr_self_test
*
* Verify IMR self_test with some simple tests to verify overlap,
* zero sized allocations and 1 KiB sized areas.
*
*/
static void __init imr_self_test(void)
{
phys_addr_t base = virt_to_phys(&_text);
size_t size = virt_to_phys(&__end_rodata) - base;
const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n";
int ret;
/* Test zero zero. */
ret = imr_add_range(0, 0, 0, 0);
imr_self_test_result(ret < 0, "zero sized IMR\n");
/* Test exact overlap. */
ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
/* Test overlap with base inside of existing. */
base += size - IMR_ALIGN;
ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
/* Test overlap with end inside of existing. */
base -= size + IMR_ALIGN * 2;
ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
/* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */
ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL,
IMR_WRITE_ACCESS_ALL);
imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n");
/* Test that a 1 KiB IMR @ zero with CPU only will work. */
ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU);
imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n");
if (ret >= 0) {
ret = imr_remove_range(0, IMR_ALIGN);
imr_self_test_result(ret == 0, "teardown - cpu-access\n");
}
/* Test 2 KiB works. */
size = IMR_ALIGN * 2;
ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, IMR_WRITE_ACCESS_ALL);
imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n");
if (ret >= 0) {
ret = imr_remove_range(0, size);
imr_self_test_result(ret == 0, "teardown 2KiB\n");
}
}
static const struct x86_cpu_id imr_ids[] __initconst = {
{ X86_VENDOR_INTEL, 5, 9 }, /* Intel Quark SoC X1000. */
{}
};
/**
* imr_self_test_init - entry point for IMR driver.
*
* return: -ENODEV for no IMR support 0 if good to go.
*/
static int __init imr_self_test_init(void)
{
if (x86_match_cpu(imr_ids))
imr_self_test();
return 0;
}
/**
* imr_self_test_exit - exit point for IMR code.
*
* return:
*/
device_initcall(imr_self_test_init);
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