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 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);