LXR linux/arch/x86/platform/intel-quark/imr

   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 */
  28static 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 */
  55static 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
 103static 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 */
 113static 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 */
 125device_initcall(imr_self_test_init);
 126