platform/intel-quark/imr_selftest.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * imr_selftest.c -- Intel Isolated Memory Region self-test driver
0004  *
0005  * Copyright(c) 2013 Intel Corporation.
0006  * Copyright(c) 2015 Bryan O'Donoghue <pure.logic@nexus-software.ie>
0007  *
0008  * IMR self test. The purpose of this module is to run a set of tests on the
0009  * IMR API to validate it's sanity. We check for overlapping, reserved
0010  * addresses and setup/teardown sanity.
0011  *
0012  */
0013
0014 #include <asm-generic/sections.h>
0015 #include <asm/cpu_device_id.h>
0016 #include <asm/imr.h>
0017 #include <asm/io.h>
0018
0019 #include <linux/init.h>
0020 #include <linux/mm.h>
0021 #include <linux/types.h>
0022
0023 #define SELFTEST KBUILD_MODNAME ": "
0024 /**
0025  * imr_self_test_result - Print result string for self test.
0026  *
0027  * @res:    result code - true if test passed false otherwise.
0028  * @fmt:    format string.
0029  * ...      variadic argument list.
0030  */
0031 static __printf(2, 3)
0032 void __init imr_self_test_result(int res, const char *fmt, ...)
0033 {
0034     va_list vlist;
0035
0036     /* Print pass/fail. */
0037     if (res)
0038         pr_info(SELFTEST "pass ");
0039     else
0040         pr_info(SELFTEST "fail ");
0041
0042     /* Print variable string. */
0043     va_start(vlist, fmt);
0044     vprintk(fmt, vlist);
0045     va_end(vlist);
0046
0047     /* Optional warning. */
0048     WARN(res == 0, "test failed");
0049 }
0050 #undef SELFTEST
0051
0052 /**
0053  * imr_self_test
0054  *
0055  * Verify IMR self_test with some simple tests to verify overlap,
0056  * zero sized allocations and 1 KiB sized areas.
0057  *
0058  */
0059 static void __init imr_self_test(void)
0060 {
0061     phys_addr_t base  = virt_to_phys(&_text);
0062     size_t size = virt_to_phys(&__end_rodata) - base;
0063     const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n";
0064     int ret;
0065
0066     /* Test zero zero. */
0067     ret = imr_add_range(0, 0, 0, 0);
0068     imr_self_test_result(ret < 0, "zero sized IMR\n");
0069
0070     /* Test exact overlap. */
0071     ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
0072     imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
0073
0074     /* Test overlap with base inside of existing. */
0075     base += size - IMR_ALIGN;
0076     ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
0077     imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
0078
0079     /* Test overlap with end inside of existing. */
0080     base -= size + IMR_ALIGN * 2;
0081     ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
0082     imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
0083
0084     /* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */
0085     ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL,
0086                 IMR_WRITE_ACCESS_ALL);
0087     imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n");
0088
0089     /* Test that a 1 KiB IMR @ zero with CPU only will work. */
0090     ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU);
0091     imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n");
0092     if (ret >= 0) {
0093         ret = imr_remove_range(0, IMR_ALIGN);
0094         imr_self_test_result(ret == 0, "teardown - cpu-access\n");
0095     }
0096
0097     /* Test 2 KiB works. */
0098     size = IMR_ALIGN * 2;
0099     ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, IMR_WRITE_ACCESS_ALL);
0100     imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n");
0101     if (ret >= 0) {
0102         ret = imr_remove_range(0, size);
0103         imr_self_test_result(ret == 0, "teardown 2KiB\n");
0104     }
0105 }
0106
0107 static const struct x86_cpu_id imr_ids[] __initconst = {
0108     X86_MATCH_VENDOR_FAM_MODEL(INTEL, 5, INTEL_FAM5_QUARK_X1000, NULL),
0109     {}
0110 };
0111
0112 /**
0113  * imr_self_test_init - entry point for IMR driver.
0114  *
0115  * return: -ENODEV for no IMR support 0 if good to go.
0116  */
0117 static int __init imr_self_test_init(void)
0118 {
0119     if (x86_match_cpu(imr_ids))
0120         imr_self_test();
0121     return 0;
0122 }
0123
0124 /**
0125  * imr_self_test_exit - exit point for IMR code.
0126  *
0127  * return:
0128  */
0129 device_initcall(imr_self_test_init);