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 <asm/io.h>
  18
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21 #include <linux/types.h>
  22
  23 #define SELFTEST KBUILD_MODNAME ": "
  24 /**
  25  * imr_self_test_result - Print result string for self test.
  26  *
  27  * @res:        result code - true if test passed false otherwise.
  28  * @fmt:        format string.
  29  * ...          variadic argument list.
  30  */
  31 static __printf(2, 3)
  32 void __init imr_self_test_result(int res, const char *fmt, ...)
  33 {
  34         va_list vlist;
  35
  36         /* Print pass/fail. */
  37         if (res)
  38                 pr_info(SELFTEST "pass ");
  39         else
  40                 pr_info(SELFTEST "fail ");
  41
  42         /* Print variable string. */
  43         va_start(vlist, fmt);
  44         vprintk(fmt, vlist);
  45         va_end(vlist);
  46
  47         /* Optional warning. */
  48         WARN(res == 0, "test failed");
  49 }
  50 #undef SELFTEST
  51
  52 /**
  53  * imr_self_test
  54  *
  55  * Verify IMR self_test with some simple tests to verify overlap,
  56  * zero sized allocations and 1 KiB sized areas.
  57  *
  58  */
  59 static void __init imr_self_test(void)
  60 {
  61         phys_addr_t base  = virt_to_phys(&_text);
  62         size_t size = virt_to_phys(&__end_rodata) - base;
  63         const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n";
  64         int ret;
  65
  66         /* Test zero zero. */
  67         ret = imr_add_range(0, 0, 0, 0);
  68         imr_self_test_result(ret < 0, "zero sized IMR\n");
  69
  70         /* Test exact overlap. */
  71         ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
  72         imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
  73
  74         /* Test overlap with base inside of existing. */
  75         base += size - IMR_ALIGN;
  76         ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
  77         imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
  78
  79         /* Test overlap with end inside of existing. */
  80         base -= size + IMR_ALIGN * 2;
  81         ret = imr_add_range(base, size, IMR_CPU, IMR_CPU);
  82         imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size));
  83
  84         /* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */
  85         ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL,
  86                             IMR_WRITE_ACCESS_ALL);
  87         imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n");
  88
  89         /* Test that a 1 KiB IMR @ zero with CPU only will work. */
  90         ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU);
  91         imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n");
  92         if (ret >= 0) {
  93                 ret = imr_remove_range(0, IMR_ALIGN);
  94                 imr_self_test_result(ret == 0, "teardown - cpu-access\n");
  95         }
  96
  97         /* Test 2 KiB works. */
  98         size = IMR_ALIGN * 2;
  99         ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, IMR_WRITE_ACCESS_ALL);
 100         imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n");
 101         if (ret >= 0) {
 102                 ret = imr_remove_range(0, size);
 103                 imr_self_test_result(ret == 0, "teardown 2KiB\n");
 104         }
 105 }
 106
 107 static const struct x86_cpu_id imr_ids[] __initconst = {
 108         X86_MATCH_VENDOR_FAM_MODEL(INTEL, 5, INTEL_FAM5_QUARK_X1000, NULL),
 109         {}
 110 };
 111
 112 /**
 113  * imr_self_test_init - entry point for IMR driver.
 114  *
 115  * return: -ENODEV for no IMR support 0 if good to go.
 116  */
 117 static int __init imr_self_test_init(void)
 118 {
 119         if (x86_match_cpu(imr_ids))
 120                 imr_self_test();
 121         return 0;
 122 }
 123
 124 /**
 125  * imr_self_test_exit - exit point for IMR code.
 126  *
 127  * return:
 128  */
 129 device_initcall(imr_self_test_init);