perf tools: Simplify the symbol priv area mechanism
[linux-3.10.git] / tools / perf / util / data_map.c
1 #include "data_map.h"
2 #include "symbol.h"
3 #include "util.h"
4 #include "debug.h"
5
6
7 static struct perf_file_handler *curr_handler;
8 static unsigned long    mmap_window = 32;
9 static char             __cwd[PATH_MAX];
10
11 static int
12 process_event_stub(event_t *event __used,
13                    unsigned long offset __used,
14                    unsigned long head __used)
15 {
16         return 0;
17 }
18
19 void register_perf_file_handler(struct perf_file_handler *handler)
20 {
21         if (!handler->process_sample_event)
22                 handler->process_sample_event = process_event_stub;
23         if (!handler->process_mmap_event)
24                 handler->process_mmap_event = process_event_stub;
25         if (!handler->process_comm_event)
26                 handler->process_comm_event = process_event_stub;
27         if (!handler->process_fork_event)
28                 handler->process_fork_event = process_event_stub;
29         if (!handler->process_exit_event)
30                 handler->process_exit_event = process_event_stub;
31         if (!handler->process_lost_event)
32                 handler->process_lost_event = process_event_stub;
33         if (!handler->process_read_event)
34                 handler->process_read_event = process_event_stub;
35         if (!handler->process_throttle_event)
36                 handler->process_throttle_event = process_event_stub;
37         if (!handler->process_unthrottle_event)
38                 handler->process_unthrottle_event = process_event_stub;
39
40         curr_handler = handler;
41 }
42
43 static int
44 process_event(event_t *event, unsigned long offset, unsigned long head)
45 {
46         trace_event(event);
47
48         switch (event->header.type) {
49         case PERF_RECORD_SAMPLE:
50                 return curr_handler->process_sample_event(event, offset, head);
51         case PERF_RECORD_MMAP:
52                 return curr_handler->process_mmap_event(event, offset, head);
53         case PERF_RECORD_COMM:
54                 return curr_handler->process_comm_event(event, offset, head);
55         case PERF_RECORD_FORK:
56                 return curr_handler->process_fork_event(event, offset, head);
57         case PERF_RECORD_EXIT:
58                 return curr_handler->process_exit_event(event, offset, head);
59         case PERF_RECORD_LOST:
60                 return curr_handler->process_lost_event(event, offset, head);
61         case PERF_RECORD_READ:
62                 return curr_handler->process_read_event(event, offset, head);
63         case PERF_RECORD_THROTTLE:
64                 return curr_handler->process_throttle_event(event, offset, head);
65         case PERF_RECORD_UNTHROTTLE:
66                 return curr_handler->process_unthrottle_event(event, offset, head);
67         default:
68                 curr_handler->total_unknown++;
69                 return -1;
70         }
71 }
72
73 int mmap_dispatch_perf_file(struct perf_header **pheader,
74                             const char *input_name,
75                             int force,
76                             int full_paths,
77                             int *cwdlen,
78                             char **cwd)
79 {
80         int ret, rc = EXIT_FAILURE;
81         struct perf_header *header;
82         unsigned long head, shift;
83         unsigned long offset = 0;
84         struct stat input_stat;
85         size_t  page_size;
86         u64 sample_type;
87         event_t *event;
88         uint32_t size;
89         int input;
90         char *buf;
91
92         if (!curr_handler)
93                 die("Forgot to register perf file handler");
94
95         page_size = getpagesize();
96
97         input = open(input_name, O_RDONLY);
98         if (input < 0) {
99                 fprintf(stderr, " failed to open file: %s", input_name);
100                 if (!strcmp(input_name, "perf.data"))
101                         fprintf(stderr, "  (try 'perf record' first)");
102                 fprintf(stderr, "\n");
103                 exit(-1);
104         }
105
106         ret = fstat(input, &input_stat);
107         if (ret < 0) {
108                 perror("failed to stat file");
109                 exit(-1);
110         }
111
112         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
113                 fprintf(stderr, "file: %s not owned by current user or root\n",
114                         input_name);
115                 exit(-1);
116         }
117
118         if (!input_stat.st_size) {
119                 fprintf(stderr, "zero-sized file, nothing to do!\n");
120                 exit(0);
121         }
122
123         *pheader = perf_header__read(input);
124         header = *pheader;
125         head = header->data_offset;
126
127         sample_type = perf_header__sample_type(header);
128
129         if (curr_handler->sample_type_check)
130                 if (curr_handler->sample_type_check(sample_type) < 0)
131                         exit(-1);
132
133         if (load_kernel(NULL) < 0) {
134                 perror("failed to load kernel symbols");
135                 return EXIT_FAILURE;
136         }
137
138         if (!full_paths) {
139                 if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
140                         perror("failed to get the current directory");
141                         return EXIT_FAILURE;
142                 }
143                 *cwd = __cwd;
144                 *cwdlen = strlen(*cwd);
145         } else {
146                 *cwd = NULL;
147                 *cwdlen = 0;
148         }
149
150         shift = page_size * (head / page_size);
151         offset += shift;
152         head -= shift;
153
154 remap:
155         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
156                            MAP_SHARED, input, offset);
157         if (buf == MAP_FAILED) {
158                 perror("failed to mmap file");
159                 exit(-1);
160         }
161
162 more:
163         event = (event_t *)(buf + head);
164
165         size = event->header.size;
166         if (!size)
167                 size = 8;
168
169         if (head + event->header.size >= page_size * mmap_window) {
170                 int munmap_ret;
171
172                 shift = page_size * (head / page_size);
173
174                 munmap_ret = munmap(buf, page_size * mmap_window);
175                 assert(munmap_ret == 0);
176
177                 offset += shift;
178                 head -= shift;
179                 goto remap;
180         }
181
182         size = event->header.size;
183
184         dump_printf("\n%p [%p]: event: %d\n",
185                         (void *)(offset + head),
186                         (void *)(long)event->header.size,
187                         event->header.type);
188
189         if (!size || process_event(event, offset, head) < 0) {
190
191                 dump_printf("%p [%p]: skipping unknown header type: %d\n",
192                         (void *)(offset + head),
193                         (void *)(long)(event->header.size),
194                         event->header.type);
195
196                 /*
197                  * assume we lost track of the stream, check alignment, and
198                  * increment a single u64 in the hope to catch on again 'soon'.
199                  */
200
201                 if (unlikely(head & 7))
202                         head &= ~7ULL;
203
204                 size = 8;
205         }
206
207         head += size;
208
209         if (offset + head >= header->data_offset + header->data_size)
210                 goto done;
211
212         if (offset + head < (unsigned long)input_stat.st_size)
213                 goto more;
214
215 done:
216         rc = EXIT_SUCCESS;
217         close(input);
218
219         return rc;
220 }
221
222