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

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  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);
126 

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