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Commit | Line | Data |
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f984b51e PP |
1 | /* |
2 | * Memory mapped I/O tracing | |
3 | * | |
4 | * Copyright (C) 2008 Pekka Paalanen <pq@iki.fi> | |
5 | */ | |
6 | ||
7 | #define DEBUG 1 | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/mmiotrace.h> | |
13829537 | 11 | #include <linux/pci.h> |
f984b51e PP |
12 | |
13 | #include "trace.h" | |
14 | ||
d0a7e8ca PP |
15 | struct header_iter { |
16 | struct pci_dev *dev; | |
17 | }; | |
18 | ||
f984b51e | 19 | static struct trace_array *mmio_trace_array; |
2039238b | 20 | static bool overrun_detected; |
f984b51e | 21 | |
bd8ac686 PP |
22 | static void mmio_reset_data(struct trace_array *tr) |
23 | { | |
24 | int cpu; | |
25 | ||
2039238b | 26 | overrun_detected = false; |
bd8ac686 PP |
27 | tr->time_start = ftrace_now(tr->cpu); |
28 | ||
29 | for_each_online_cpu(cpu) | |
30 | tracing_reset(tr->data[cpu]); | |
31 | } | |
f984b51e PP |
32 | |
33 | static void mmio_trace_init(struct trace_array *tr) | |
34 | { | |
35 | pr_debug("in %s\n", __func__); | |
36 | mmio_trace_array = tr; | |
bd8ac686 PP |
37 | if (tr->ctrl) { |
38 | mmio_reset_data(tr); | |
f984b51e | 39 | enable_mmiotrace(); |
bd8ac686 | 40 | } |
f984b51e PP |
41 | } |
42 | ||
43 | static void mmio_trace_reset(struct trace_array *tr) | |
44 | { | |
45 | pr_debug("in %s\n", __func__); | |
46 | if (tr->ctrl) | |
47 | disable_mmiotrace(); | |
bd8ac686 PP |
48 | mmio_reset_data(tr); |
49 | mmio_trace_array = NULL; | |
f984b51e PP |
50 | } |
51 | ||
52 | static void mmio_trace_ctrl_update(struct trace_array *tr) | |
53 | { | |
54 | pr_debug("in %s\n", __func__); | |
bd8ac686 PP |
55 | if (tr->ctrl) { |
56 | mmio_reset_data(tr); | |
f984b51e | 57 | enable_mmiotrace(); |
bd8ac686 | 58 | } else { |
f984b51e | 59 | disable_mmiotrace(); |
bd8ac686 PP |
60 | } |
61 | } | |
62 | ||
13829537 PP |
63 | static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) |
64 | { | |
65 | int ret = 0; | |
66 | int i; | |
67 | resource_size_t start, end; | |
68 | const struct pci_driver *drv = pci_dev_driver(dev); | |
69 | ||
70 | /* XXX: incomplete checks for trace_seq_printf() return value */ | |
71 | ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", | |
72 | dev->bus->number, dev->devfn, | |
73 | dev->vendor, dev->device, dev->irq); | |
74 | /* | |
75 | * XXX: is pci_resource_to_user() appropriate, since we are | |
76 | * supposed to interpret the __ioremap() phys_addr argument based on | |
77 | * these printed values? | |
78 | */ | |
79 | for (i = 0; i < 7; i++) { | |
80 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
81 | ret += trace_seq_printf(s, " %llx", | |
82 | (unsigned long long)(start | | |
83 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
84 | } | |
85 | for (i = 0; i < 7; i++) { | |
86 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); | |
87 | ret += trace_seq_printf(s, " %llx", | |
88 | dev->resource[i].start < dev->resource[i].end ? | |
89 | (unsigned long long)(end - start) + 1 : 0); | |
90 | } | |
91 | if (drv) | |
92 | ret += trace_seq_printf(s, " %s\n", drv->name); | |
93 | else | |
94 | ret += trace_seq_printf(s, " \n"); | |
95 | return ret; | |
96 | } | |
97 | ||
d0a7e8ca PP |
98 | static void destroy_header_iter(struct header_iter *hiter) |
99 | { | |
100 | if (!hiter) | |
101 | return; | |
102 | pci_dev_put(hiter->dev); | |
103 | kfree(hiter); | |
104 | } | |
105 | ||
106 | static void mmio_pipe_open(struct trace_iterator *iter) | |
bd8ac686 | 107 | { |
d0a7e8ca | 108 | struct header_iter *hiter; |
bd8ac686 | 109 | struct trace_seq *s = &iter->seq; |
13829537 PP |
110 | |
111 | trace_seq_printf(s, "VERSION 20070824\n"); | |
112 | ||
d0a7e8ca PP |
113 | hiter = kzalloc(sizeof(*hiter), GFP_KERNEL); |
114 | if (!hiter) | |
115 | return; | |
116 | ||
117 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); | |
118 | iter->private = hiter; | |
119 | } | |
120 | ||
121 | /* XXX: This is not called when the pipe is closed! */ | |
122 | static void mmio_close(struct trace_iterator *iter) | |
123 | { | |
124 | struct header_iter *hiter = iter->private; | |
125 | destroy_header_iter(hiter); | |
126 | iter->private = NULL; | |
127 | } | |
128 | ||
2039238b PP |
129 | static unsigned long count_overruns(struct trace_iterator *iter) |
130 | { | |
131 | int cpu; | |
132 | unsigned long cnt = 0; | |
133 | for_each_online_cpu(cpu) { | |
134 | cnt += iter->overrun[cpu]; | |
135 | iter->overrun[cpu] = 0; | |
136 | } | |
137 | return cnt; | |
138 | } | |
139 | ||
d0a7e8ca PP |
140 | static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, |
141 | char __user *ubuf, size_t cnt, loff_t *ppos) | |
142 | { | |
143 | ssize_t ret; | |
144 | struct header_iter *hiter = iter->private; | |
145 | struct trace_seq *s = &iter->seq; | |
2039238b PP |
146 | unsigned long n; |
147 | ||
148 | n = count_overruns(iter); | |
149 | if (n) { | |
150 | /* XXX: This is later than where events were lost. */ | |
151 | trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); | |
152 | if (!overrun_detected) | |
153 | pr_warning("mmiotrace has lost events.\n"); | |
154 | overrun_detected = true; | |
155 | goto print_out; | |
156 | } | |
d0a7e8ca PP |
157 | |
158 | if (!hiter) | |
159 | return 0; | |
160 | ||
161 | mmio_print_pcidev(s, hiter->dev); | |
162 | hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev); | |
163 | ||
164 | if (!hiter->dev) { | |
165 | destroy_header_iter(hiter); | |
166 | iter->private = NULL; | |
167 | } | |
168 | ||
2039238b | 169 | print_out: |
d0a7e8ca PP |
170 | ret = trace_seq_to_user(s, ubuf, cnt); |
171 | return (ret == -EBUSY) ? 0 : ret; | |
bd8ac686 PP |
172 | } |
173 | ||
174 | static int mmio_print_rw(struct trace_iterator *iter) | |
175 | { | |
176 | struct trace_entry *entry = iter->ent; | |
2e2ca155 | 177 | struct mmiotrace_rw *rw = &entry->field.mmiorw; |
bd8ac686 | 178 | struct trace_seq *s = &iter->seq; |
2e2ca155 | 179 | unsigned long long t = ns2usecs(entry->field.t); |
bd8ac686 PP |
180 | unsigned long usec_rem = do_div(t, 1000000ULL); |
181 | unsigned secs = (unsigned long)t; | |
182 | int ret = 1; | |
183 | ||
2e2ca155 | 184 | switch (entry->field.mmiorw.opcode) { |
bd8ac686 PP |
185 | case MMIO_READ: |
186 | ret = trace_seq_printf(s, | |
dee310d0 PP |
187 | "R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
188 | rw->width, secs, usec_rem, rw->map_id, | |
189 | (unsigned long long)rw->phys, | |
736ca61f | 190 | rw->value, rw->pc, 0); |
bd8ac686 PP |
191 | break; |
192 | case MMIO_WRITE: | |
193 | ret = trace_seq_printf(s, | |
dee310d0 PP |
194 | "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n", |
195 | rw->width, secs, usec_rem, rw->map_id, | |
196 | (unsigned long long)rw->phys, | |
736ca61f | 197 | rw->value, rw->pc, 0); |
bd8ac686 PP |
198 | break; |
199 | case MMIO_UNKNOWN_OP: | |
200 | ret = trace_seq_printf(s, | |
dee310d0 PP |
201 | "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n", |
202 | secs, usec_rem, rw->map_id, | |
203 | (unsigned long long)rw->phys, | |
bd8ac686 | 204 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
736ca61f | 205 | (rw->value >> 0) & 0xff, rw->pc, 0); |
bd8ac686 PP |
206 | break; |
207 | default: | |
208 | ret = trace_seq_printf(s, "rw what?\n"); | |
209 | break; | |
210 | } | |
211 | if (ret) | |
212 | return 1; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static int mmio_print_map(struct trace_iterator *iter) | |
217 | { | |
218 | struct trace_entry *entry = iter->ent; | |
2e2ca155 | 219 | struct mmiotrace_map *m = &entry->field.mmiomap; |
bd8ac686 | 220 | struct trace_seq *s = &iter->seq; |
2e2ca155 | 221 | unsigned long long t = ns2usecs(entry->field.t); |
bd8ac686 PP |
222 | unsigned long usec_rem = do_div(t, 1000000ULL); |
223 | unsigned secs = (unsigned long)t; | |
224 | int ret = 1; | |
225 | ||
2e2ca155 | 226 | switch (entry->field.mmiorw.opcode) { |
bd8ac686 PP |
227 | case MMIO_PROBE: |
228 | ret = trace_seq_printf(s, | |
dee310d0 PP |
229 | "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n", |
230 | secs, usec_rem, m->map_id, | |
231 | (unsigned long long)m->phys, m->virt, m->len, | |
e0fd5c2f | 232 | 0UL, 0); |
bd8ac686 PP |
233 | break; |
234 | case MMIO_UNPROBE: | |
235 | ret = trace_seq_printf(s, | |
236 | "UNMAP %lu.%06lu %d 0x%lx %d\n", | |
e0fd5c2f | 237 | secs, usec_rem, m->map_id, 0UL, 0); |
bd8ac686 PP |
238 | break; |
239 | default: | |
240 | ret = trace_seq_printf(s, "map what?\n"); | |
241 | break; | |
242 | } | |
243 | if (ret) | |
244 | return 1; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | /* return 0 to abort printing without consuming current entry in pipe mode */ | |
249 | static int mmio_print_line(struct trace_iterator *iter) | |
250 | { | |
251 | switch (iter->ent->type) { | |
252 | case TRACE_MMIO_RW: | |
253 | return mmio_print_rw(iter); | |
254 | case TRACE_MMIO_MAP: | |
255 | return mmio_print_map(iter); | |
256 | default: | |
257 | return 1; /* ignore unknown entries */ | |
258 | } | |
f984b51e PP |
259 | } |
260 | ||
261 | static struct tracer mmio_tracer __read_mostly = | |
262 | { | |
263 | .name = "mmiotrace", | |
264 | .init = mmio_trace_init, | |
265 | .reset = mmio_trace_reset, | |
d0a7e8ca PP |
266 | .pipe_open = mmio_pipe_open, |
267 | .close = mmio_close, | |
268 | .read = mmio_read, | |
f984b51e | 269 | .ctrl_update = mmio_trace_ctrl_update, |
bd8ac686 | 270 | .print_line = mmio_print_line, |
f984b51e PP |
271 | }; |
272 | ||
273 | __init static int init_mmio_trace(void) | |
274 | { | |
f984b51e PP |
275 | return register_tracer(&mmio_tracer); |
276 | } | |
277 | device_initcall(init_mmio_trace); | |
278 | ||
bd8ac686 | 279 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
f984b51e PP |
280 | { |
281 | struct trace_array *tr = mmio_trace_array; | |
282 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; | |
bd8ac686 PP |
283 | __trace_mmiotrace_rw(tr, data, rw); |
284 | } | |
f984b51e | 285 | |
bd8ac686 PP |
286 | void mmio_trace_mapping(struct mmiotrace_map *map) |
287 | { | |
288 | struct trace_array *tr = mmio_trace_array; | |
289 | struct trace_array_cpu *data; | |
290 | ||
291 | preempt_disable(); | |
292 | data = tr->data[smp_processor_id()]; | |
293 | __trace_mmiotrace_map(tr, data, map); | |
294 | preempt_enable(); | |
f984b51e | 295 | } |