arch/x86/platform/intel-quark/imr_selftest.c

   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 __printf(2, 3)
  29 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);
  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);
  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);
  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);
  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);
  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);
  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, IMR_WRITE_ACCESS_ALL);
  97         imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n");
  98         if (ret >= 0) {
  99                 ret = imr_remove_range(0, size);
 100                 imr_self_test_result(ret == 0, "teardown 2KiB\n");
 101         }
 102 }
 103
 104 static const struct x86_cpu_id imr_ids[] __initconst = {
 105         { X86_VENDOR_INTEL, 5, 9 },     /* Intel Quark SoC X1000. */
 106         {}
 107 };
 108
 109 /**
 110  * imr_self_test_init - entry point for IMR driver.
 111  *
 112  * return: -ENODEV for no IMR support 0 if good to go.
 113  */
 114 static int __init imr_self_test_init(void)
 115 {
 116         if (x86_match_cpu(imr_ids))
 117                 imr_self_test();
 118         return 0;
 119 }
 120
 121 /**
 122  * imr_self_test_exit - exit point for IMR code.
 123  *
 124  * return:
 125  */
 126 device_initcall(imr_self_test_init);