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1 | /* test-mark.c |
2 | * |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/proc_fs.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/timex.h> |
9 | #include <linux/marker.h> |
10 | #include <asm/ptrace.h> |
11 | #include <asm/system.h> |
12 | |
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13 | static void pmc_flush_cache(void) |
14 | { |
15 | /* write back and invalidate cache (a serializing instruction) */ |
16 | |
17 | __asm__ __volatile__ ( "wbinvd" : : : "memory" ); |
18 | |
19 | /* The wbinvd instruction does not wait for the external caches |
20 | * to be flushed, but only requests that it be done. The loop |
21 | * is to be sure that enough time has elapsed, but the compiler |
22 | * might simplify or even remove it. The loop bound is for a |
23 | * 512 KB L2 cache. On a Pentium Pro/II/III, the loop uses |
24 | * 2 cycles per iteration. |
25 | * |
26 | * Does wbinvd also cause the TLB to be flushed? |
27 | * A comment in mtrr.c suggests that it does. |
28 | */ |
29 | { register int i; for (i = 0; i < 512*1024; i++) { } } |
30 | } |
31 | |
32 | |
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33 | static void noinline test2(const struct marker *mdata, |
34 | void *call_private, ...) |
35 | { |
36 | unsigned char *ins = __builtin_return_address(0) - 5; |
37 | #if 0 |
38 | /* not called */ |
39 | printk("ip %p\n", __builtin_return_address(0)); |
40 | printk("prev_ins %hX %hX %hX %hX %hX\n", |
41 | ins[0], ins[1], ins[2], ins[3], ins[4]); |
42 | #endif //0 |
43 | ins[0] = 0x90; |
44 | ins[1] = 0x8d; |
45 | ins[2] = 0x74; |
46 | ins[3] = 0x26; |
47 | ins[4] = 0x00; |
48 | } |
49 | |
50 | /* |
51 | * Generic marker flavor always available. |
52 | * Note : the empty asm volatile with read constraint is used here instead of a |
53 | * "used" attribute to fix a gcc 4.1.x bug. |
54 | * Make sure the alignment of the structure in the __markers section will |
55 | * not add unwanted padding between the beginning of the section and the |
56 | * structure. Force alignment to the same alignment as the section start. |
57 | */ |
58 | #define __my_trace_mark(generic, name, call_private, format, args...) \ |
59 | do { \ |
60 | static const char __mstrtab_##name[] \ |
61 | __attribute__((section("__markers_strings"))) \ |
62 | = #name "\0" format; \ |
63 | static struct marker __mark_##name \ |
64 | __attribute__((section("__markers"), aligned(8))) = \ |
65 | { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)], \ |
66 | 0, 0, marker_probe_cb, \ |
67 | { __mark_empty_function, NULL}, NULL }; \ |
68 | __mark_check_format(format, ## args); \ |
69 | if (!generic) { \ |
70 | if (unlikely(imv_read(__mark_##name.state))) \ |
71 | test2 \ |
72 | (&__mark_##name, call_private, \ |
73 | ## args); \ |
74 | } else { \ |
75 | if (unlikely(_imv_read(__mark_##name.state))) \ |
76 | test2 \ |
77 | (&__mark_##name, call_private, \ |
78 | ## args); \ |
79 | } \ |
80 | } while (0) |
81 | |
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82 | struct proc_dir_entry *pentry = NULL; |
83 | |
84 | static inline void test(unsigned long arg, unsigned long arg2) |
85 | { |
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86 | register int temp[5]; |
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87 | #ifdef CACHEFLUSH |
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88 | pmc_flush_cache(); |
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89 | #endif |
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90 | temp[2] = (temp[0] + 60) << 10; |
91 | temp[3] = (temp[2] + 60) << 10; |
92 | temp[4] = (temp[3] + 60) << 10; |
93 | temp[0] = (temp[4] + 60) << 10; |
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94 | //asm volatile (""); |
95 | //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
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96 | barrier(); |
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97 | test2(NULL, NULL, 2, 10, arg, arg2); |
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98 | barrier(); // make sure the compiler does not optimize marker conditions away! |
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99 | //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
100 | } |
101 | |
102 | static int my_open(struct inode *inode, struct file *file) |
103 | { |
104 | unsigned int i; |
105 | cycles_t cycles1, cycles2; |
106 | unsigned long flags; |
107 | |
108 | local_irq_save(flags); |
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109 | #ifdef CACHEFLUSH |
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110 | pmc_flush_cache(); /* initial write back, without cycle count */ |
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111 | msleep(20); /* wait for L2 flush */ |
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112 | #endif |
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113 | rdtsc_barrier(); |
114 | cycles1 = get_cycles(); |
115 | rdtsc_barrier(); |
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116 | for(i=0; i<2000; i++) { |
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117 | test(i, i); |
118 | test(i, i); |
119 | test(i, i); |
120 | test(i, i); |
121 | test(i, i); |
122 | test(i, i); |
123 | test(i, i); |
124 | test(i, i); |
125 | test(i, i); |
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126 | test(i, i); |
127 | } |
128 | rdtsc_barrier(); |
129 | cycles2 = get_cycles(); |
130 | rdtsc_barrier(); |
131 | local_irq_restore(flags); |
37c58830 |
132 | printk("cycles : %llu\n", cycles2-cycles1); |
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133 | return -EPERM; |
134 | } |
135 | |
136 | |
137 | static struct file_operations my_operations = { |
138 | .open = my_open, |
139 | }; |
140 | |
141 | int init_module(void) |
142 | { |
143 | pentry = create_proc_entry("testmark", 0444, NULL); |
144 | if (pentry) |
145 | pentry->proc_fops = &my_operations; |
146 | |
147 | return 0; |
148 | } |
149 | |
150 | void cleanup_module(void) |
151 | { |
152 | remove_proc_entry("testmark", NULL); |
153 | } |
154 | |
155 | MODULE_LICENSE("GPL"); |
156 | MODULE_AUTHOR("Mathieu Desnoyers"); |
157 | MODULE_DESCRIPTION("Marker Test"); |
158 | MODULE_VERSION("1.0"); |
159 | |