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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | // 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 <asm/io.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_MATCH_VENDOR_FAM_MODEL(INTEL, 5, INTEL_FAM5_QUARK_X1000, NULL), {} }; /** * 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); |