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