Bryan O'Donoghue | 28a375d | 2015-01-30 16:29:38 +0000 | [diff] [blame] | 1 | /** |
| 2 | * imr_selftest.c |
| 3 | * |
| 4 | * Copyright(c) 2013 Intel Corporation. |
| 5 | * Copyright(c) 2015 Bryan O'Donoghue <pure.logic@nexus-software.ie> |
| 6 | * |
| 7 | * IMR self test. The purpose of this module is to run a set of tests on the |
| 8 | * IMR API to validate it's sanity. We check for overlapping, reserved |
| 9 | * addresses and setup/teardown sanity. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <asm-generic/sections.h> |
Bryan O'Donoghue | a6fcb6d | 2015-03-31 12:15:36 +0100 | [diff] [blame] | 14 | #include <asm/cpu_device_id.h> |
Bryan O'Donoghue | 28a375d | 2015-01-30 16:29:38 +0000 | [diff] [blame] | 15 | #include <asm/imr.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/types.h> |
| 20 | |
| 21 | #define SELFTEST KBUILD_MODNAME ": " |
| 22 | /** |
| 23 | * imr_self_test_result - Print result string for self test. |
| 24 | * |
| 25 | * @res: result code - true if test passed false otherwise. |
| 26 | * @fmt: format string. |
| 27 | * ... variadic argument list. |
| 28 | */ |
| 29 | static void __init imr_self_test_result(int res, const char *fmt, ...) |
| 30 | { |
| 31 | va_list vlist; |
| 32 | |
| 33 | /* Print pass/fail. */ |
| 34 | if (res) |
| 35 | pr_info(SELFTEST "pass "); |
| 36 | else |
| 37 | pr_info(SELFTEST "fail "); |
| 38 | |
| 39 | /* Print variable string. */ |
| 40 | va_start(vlist, fmt); |
| 41 | vprintk(fmt, vlist); |
| 42 | va_end(vlist); |
| 43 | |
| 44 | /* Optional warning. */ |
| 45 | WARN(res == 0, "test failed"); |
| 46 | } |
| 47 | #undef SELFTEST |
| 48 | |
| 49 | /** |
| 50 | * imr_self_test |
| 51 | * |
| 52 | * Verify IMR self_test with some simple tests to verify overlap, |
| 53 | * zero sized allocations and 1 KiB sized areas. |
| 54 | * |
| 55 | */ |
| 56 | static void __init imr_self_test(void) |
| 57 | { |
| 58 | phys_addr_t base = virt_to_phys(&_text); |
| 59 | size_t size = virt_to_phys(&__end_rodata) - base; |
| 60 | const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n"; |
| 61 | int ret; |
| 62 | |
| 63 | /* Test zero zero. */ |
| 64 | ret = imr_add_range(0, 0, 0, 0, false); |
| 65 | imr_self_test_result(ret < 0, "zero sized IMR\n"); |
| 66 | |
| 67 | /* Test exact overlap. */ |
| 68 | ret = imr_add_range(base, size, IMR_CPU, IMR_CPU, false); |
| 69 | imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
| 70 | |
| 71 | /* Test overlap with base inside of existing. */ |
| 72 | base += size - IMR_ALIGN; |
| 73 | ret = imr_add_range(base, size, IMR_CPU, IMR_CPU, false); |
| 74 | imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
| 75 | |
| 76 | /* Test overlap with end inside of existing. */ |
| 77 | base -= size + IMR_ALIGN * 2; |
| 78 | ret = imr_add_range(base, size, IMR_CPU, IMR_CPU, false); |
| 79 | imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
| 80 | |
| 81 | /* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */ |
| 82 | ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL, |
| 83 | IMR_WRITE_ACCESS_ALL, false); |
| 84 | imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n"); |
| 85 | |
| 86 | /* Test that a 1 KiB IMR @ zero with CPU only will work. */ |
| 87 | ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU, false); |
| 88 | imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n"); |
| 89 | if (ret >= 0) { |
| 90 | ret = imr_remove_range(0, IMR_ALIGN); |
| 91 | imr_self_test_result(ret == 0, "teardown - cpu-access\n"); |
| 92 | } |
| 93 | |
| 94 | /* Test 2 KiB works. */ |
| 95 | size = IMR_ALIGN * 2; |
| 96 | ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, |
| 97 | IMR_WRITE_ACCESS_ALL, false); |
| 98 | imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n"); |
| 99 | if (ret >= 0) { |
| 100 | ret = imr_remove_range(0, size); |
| 101 | imr_self_test_result(ret == 0, "teardown 2KiB\n"); |
| 102 | } |
| 103 | } |
| 104 | |
Bryan O'Donoghue | a6fcb6d | 2015-03-31 12:15:36 +0100 | [diff] [blame] | 105 | static const struct x86_cpu_id imr_ids[] __initconst = { |
| 106 | { X86_VENDOR_INTEL, 5, 9 }, /* Intel Quark SoC X1000. */ |
| 107 | {} |
| 108 | }; |
| 109 | MODULE_DEVICE_TABLE(x86cpu, imr_ids); |
| 110 | |
Bryan O'Donoghue | 28a375d | 2015-01-30 16:29:38 +0000 | [diff] [blame] | 111 | /** |
| 112 | * imr_self_test_init - entry point for IMR driver. |
| 113 | * |
| 114 | * return: -ENODEV for no IMR support 0 if good to go. |
| 115 | */ |
| 116 | static int __init imr_self_test_init(void) |
| 117 | { |
Bryan O'Donoghue | a6fcb6d | 2015-03-31 12:15:36 +0100 | [diff] [blame] | 118 | if (x86_match_cpu(imr_ids)) |
| 119 | imr_self_test(); |
Bryan O'Donoghue | 28a375d | 2015-01-30 16:29:38 +0000 | [diff] [blame] | 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * imr_self_test_exit - exit point for IMR code. |
| 125 | * |
| 126 | * return: |
| 127 | */ |
| 128 | static void __exit imr_self_test_exit(void) |
| 129 | { |
| 130 | } |
| 131 | |
| 132 | module_init(imr_self_test_init); |
| 133 | module_exit(imr_self_test_exit); |
| 134 | |
| 135 | MODULE_AUTHOR("Bryan O'Donoghue <pure.logic@nexus-software.ie>"); |
| 136 | MODULE_DESCRIPTION("Intel Isolated Memory Region self-test driver"); |
| 137 | MODULE_LICENSE("Dual BSD/GPL"); |