1 /** 2 * imr_selftest.c -- Intel Isolated Memory Region self-test driver 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> 14 #include <asm/cpu_device_id.h> 15 #include <asm/imr.h> 16 #include <linux/init.h> 17 #include <linux/mm.h> 18 #include <linux/types.h> 19 20 #define SELFTEST KBUILD_MODNAME ": " 21 /** 22 * imr_self_test_result - Print result string for self test. 23 * 24 * @res: result code - true if test passed false otherwise. 25 * @fmt: format string. 26 * ... variadic argument list. 27 */ 28 static void __init imr_self_test_result(int res, const char *fmt, ...) 29 { 30 va_list vlist; 31 32 /* Print pass/fail. */ 33 if (res) 34 pr_info(SELFTEST "pass "); 35 else 36 pr_info(SELFTEST "fail "); 37 38 /* Print variable string. */ 39 va_start(vlist, fmt); 40 vprintk(fmt, vlist); 41 va_end(vlist); 42 43 /* Optional warning. */ 44 WARN(res == 0, "test failed"); 45 } 46 #undef SELFTEST 47 48 /** 49 * imr_self_test 50 * 51 * Verify IMR self_test with some simple tests to verify overlap, 52 * zero sized allocations and 1 KiB sized areas. 53 * 54 */ 55 static void __init imr_self_test(void) 56 { 57 phys_addr_t base = virt_to_phys(&_text); 58 size_t size = virt_to_phys(&__end_rodata) - base; 59 const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n"; 60 int ret; 61 62 /* Test zero zero. */ 63 ret = imr_add_range(0, 0, 0, 0); 64 imr_self_test_result(ret < 0, "zero sized IMR\n"); 65 66 /* Test exact overlap. */ 67 ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); 68 imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); 69 70 /* Test overlap with base inside of existing. */ 71 base += size - IMR_ALIGN; 72 ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); 73 imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); 74 75 /* Test overlap with end inside of existing. */ 76 base -= size + IMR_ALIGN * 2; 77 ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); 78 imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); 79 80 /* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */ 81 ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL, 82 IMR_WRITE_ACCESS_ALL); 83 imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n"); 84 85 /* Test that a 1 KiB IMR @ zero with CPU only will work. */ 86 ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU); 87 imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n"); 88 if (ret >= 0) { 89 ret = imr_remove_range(0, IMR_ALIGN); 90 imr_self_test_result(ret == 0, "teardown - cpu-access\n"); 91 } 92 93 /* Test 2 KiB works. */ 94 size = IMR_ALIGN * 2; 95 ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, IMR_WRITE_ACCESS_ALL); 96 imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n"); 97 if (ret >= 0) { 98 ret = imr_remove_range(0, size); 99 imr_self_test_result(ret == 0, "teardown 2KiB\n"); 100 } 101 } 102 103 static const struct x86_cpu_id imr_ids[] __initconst = { 104 { X86_VENDOR_INTEL, 5, 9 }, /* Intel Quark SoC X1000. */ 105 {} 106 }; 107 108 /** 109 * imr_self_test_init - entry point for IMR driver. 110 * 111 * return: -ENODEV for no IMR support 0 if good to go. 112 */ 113 static int __init imr_self_test_init(void) 114 { 115 if (x86_match_cpu(imr_ids)) 116 imr_self_test(); 117 return 0; 118 } 119 120 /** 121 * imr_self_test_exit - exit point for IMR code. 122 * 123 * return: 124 */ 125 device_initcall(imr_self_test_init); 126