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