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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) |
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 | |
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32 | static void noinline test2(const struct marker *mdata, |
33 | void *call_private, ...) |
34 | { |
35 | /* not called */ |
36 | printk("blah\n"); |
37 | } |
38 | |
39 | /* |
40 | * Generic marker flavor always available. |
41 | * Note : the empty asm volatile with read constraint is used here instead of a |
42 | * "used" attribute to fix a gcc 4.1.x bug. |
43 | * Make sure the alignment of the structure in the __markers section will |
44 | * not add unwanted padding between the beginning of the section and the |
45 | * structure. Force alignment to the same alignment as the section start. |
46 | */ |
47 | #define __my_trace_mark(generic, name, call_private, format, args...) \ |
48 | do { \ |
49 | static const char __mstrtab_##name[] \ |
50 | __attribute__((section("__markers_strings"))) \ |
51 | = #name "\0" format; \ |
52 | static struct marker __mark_##name \ |
53 | __attribute__((section("__markers"), aligned(8))) = \ |
54 | { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)], \ |
55 | 0, 0, marker_probe_cb, \ |
56 | { __mark_empty_function, NULL}, NULL }; \ |
57 | __mark_check_format(format, ## args); \ |
58 | if (!generic) { \ |
59 | if (unlikely(imv_read(__mark_##name.state))) \ |
60 | test2 \ |
61 | (&__mark_##name, call_private, \ |
62 | ## args); \ |
63 | } else { \ |
64 | if (unlikely(_imv_read(__mark_##name.state))) \ |
65 | test2 \ |
66 | (&__mark_##name, call_private, \ |
67 | ## args); \ |
68 | } \ |
69 | } while (0) |
70 | |
71 | //asm volatile (""); |
72 | struct proc_dir_entry *pentry = NULL; |
73 | |
74 | static inline void test(unsigned long arg, unsigned long arg2) |
75 | { |
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76 | register int temp[5]; |
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77 | #ifdef CACHEFLUSH |
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78 | pmc_flush_cache(); |
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79 | #endif |
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80 | temp[2] = (temp[0] + 60) << 10; |
81 | temp[3] = (temp[2] + 60) << 10; |
82 | temp[4] = (temp[3] + 60) << 10; |
83 | temp[0] = (temp[4] + 60) << 10; |
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84 | //asm volatile (""); |
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85 | barrier(); |
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86 | __my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
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87 | barrier(); |
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88 | //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
89 | } |
90 | |
91 | static int my_open(struct inode *inode, struct file *file) |
92 | { |
93 | unsigned int i; |
94 | cycles_t cycles1, cycles2; |
95 | unsigned long flags; |
96 | |
97 | local_irq_save(flags); |
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98 | #ifdef CACHEFLUSH |
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99 | pmc_flush_cache(); /* initial write back, without cycle count */ |
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100 | msleep(20); /* wait for L2 flush */ |
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101 | #endif |
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102 | rdtsc_barrier(); |
103 | cycles1 = get_cycles(); |
104 | rdtsc_barrier(); |
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105 | for(i=0; i<2000; i++) { |
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106 | test(i, i); |
107 | test(i, i); |
108 | test(i, i); |
109 | test(i, i); |
110 | test(i, i); |
111 | test(i, i); |
112 | test(i, i); |
113 | test(i, i); |
114 | test(i, i); |
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115 | test(i, i); |
116 | } |
117 | rdtsc_barrier(); |
118 | cycles2 = get_cycles(); |
119 | rdtsc_barrier(); |
120 | local_irq_restore(flags); |
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121 | printk("cycles : %llu\n", cycles2-cycles1); |
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122 | return -EPERM; |
123 | } |
124 | |
125 | |
126 | static struct file_operations my_operations = { |
127 | .open = my_open, |
128 | }; |
129 | |
130 | int init_module(void) |
131 | { |
132 | pentry = create_proc_entry("testmark", 0444, NULL); |
133 | if (pentry) |
134 | pentry->proc_fops = &my_operations; |
135 | |
136 | return 0; |
137 | } |
138 | |
139 | void cleanup_module(void) |
140 | { |
141 | remove_proc_entry("testmark", NULL); |
142 | } |
143 | |
144 | MODULE_LICENSE("GPL"); |
145 | MODULE_AUTHOR("Mathieu Desnoyers"); |
146 | MODULE_DESCRIPTION("Marker Test"); |
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147 | MODULE_VERSION("1.0"); |