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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /**
   3  * imr_selftest.c -- Intel Isolated Memory Region self-test driver
   4  *
   5  * Copyright(c) 2013 Intel Corporation.
   6  * Copyright(c) 2015 Bryan O'Donoghue <pure.logic@nexus-software.ie>
   7  *
   8  * IMR self test. The purpose of this module is to run a set of tests on the
   9  * IMR API to validate it's sanity. We check for overlapping, reserved
  10  * addresses and setup/teardown sanity.
  11  *
  12  */
  13
  14 #include <asm-generic/sections.h>
  15 #include <asm/cpu_device_id.h>
  16 #include <asm/imr.h>
  17 #include <linux/init.h>
  18 #include <linux/mm.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 __printf(2, 3)
  30 void __init imr_self_test_result(int res, const char *fmt, ...)
  31 {
  32         va_list vlist;
  33
  34         /* Print pass/fail. */
  35         if (res)
  36                 pr_info(SELFTEST "pass ");
  37         else
  38                 pr_info(SELFTEST "fail ");
  39
  40         /* Print variable string. */
  41         va_start(vlist, fmt);
  42         vprintk(fmt, vlist);
  43         va_end(vlist);
  44
  45         /* Optional warning. */
  46         WARN(res == 0, "test failed");
  47 }
  48 #undef SELFTEST
  49
  50 /**
  51  * imr_self_test
  52  *
  53  * Verify IMR self_test with some simple tests to verify overlap,
  54  * zero sized allocations and 1 KiB sized areas.
  55  *
  56  */
  57 static void __init imr_self_test(void)
  58 {
  59         phys_addr_t base  = virt_to_phys(&_text);
  60         size_t size = virt_to_phys(&__end_rodata) - base;
  61         const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n";
  62         int ret;
  63
  64         /* Test zero zero. */
  65         ret = imr_add_range(0, 0, 0, 0);
  66         imr_self_test_result(ret < 0, "zero sized IMR\n");
  67
  68         /* Test exact overlap. */
  69         ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
  70         imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
  71
  72         /* Test overlap with base inside of existing. */
  73         base += size - IMR_ALIGN;
  74         ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
  75         imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
  76
  77         /* Test overlap with end inside of existing. */
  78         base -= size + IMR_ALIGN * 2;
  79         ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
  80         imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
  81
  82         /* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */
  83         ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL,
  84                             IMR_WRITE_ACCESS_ALL);
  85         imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n");
  86
  87         /* Test that a 1 KiB IMR @ zero with CPU only will work. */
  88         ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU);
  89         imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n");
  90         if (ret >= 0) {
  91                 ret = imr_remove_range(0, IMR_ALIGN);
  92                 imr_self_test_result(ret == 0, "teardown - cpu-access\n");
  93         }
  94
  95         /* Test 2 KiB works. */
  96         size = IMR_ALIGN * 2;
  97         ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, IMR_WRITE_ACCESS_ALL);
  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
 105 static const struct x86_cpu_id imr_ids[] __initconst = {
 106         { X86_VENDOR_INTEL, 5, 9 },     /* Intel Quark SoC X1000. */
 107         {}
 108 };
 109
 110 /**
 111  * imr_self_test_init - entry point for IMR driver.
 112  *
 113  * return: -ENODEV for no IMR support 0 if good to go.
 114  */
 115 static int __init imr_self_test_init(void)
 116 {
 117         if (x86_match_cpu(imr_ids))
 118                 imr_self_test();
 119         return 0;
 120 }
 121
 122 /**
 123  * imr_self_test_exit - exit point for IMR code.
 124  *
 125  * return:
 126  */
 127 device_initcall(imr_self_test_init);