~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/kernel/trace/trace_mmiotrace.c

Version: ~ [ linux-5.11 ] ~ [ linux-5.10.17 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.99 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.176 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.221 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.257 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.257 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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>
 11 #include <linux/pci.h>
 12 #include <linux/time.h>
 13 
 14 #include <asm/atomic.h>
 15 
 16 #include "trace.h"
 17 #include "trace_output.h"
 18 
 19 struct header_iter {
 20         struct pci_dev *dev;
 21 };
 22 
 23 static struct trace_array *mmio_trace_array;
 24 static bool overrun_detected;
 25 static unsigned long prev_overruns;
 26 static atomic_t dropped_count;
 27 
 28 static void mmio_reset_data(struct trace_array *tr)
 29 {
 30         overrun_detected = false;
 31         prev_overruns = 0;
 32 
 33         tracing_reset_online_cpus(tr);
 34 }
 35 
 36 static int mmio_trace_init(struct trace_array *tr)
 37 {
 38         pr_debug("in %s\n", __func__);
 39         mmio_trace_array = tr;
 40 
 41         mmio_reset_data(tr);
 42         enable_mmiotrace();
 43         return 0;
 44 }
 45 
 46 static void mmio_trace_reset(struct trace_array *tr)
 47 {
 48         pr_debug("in %s\n", __func__);
 49 
 50         disable_mmiotrace();
 51         mmio_reset_data(tr);
 52         mmio_trace_array = NULL;
 53 }
 54 
 55 static void mmio_trace_start(struct trace_array *tr)
 56 {
 57         pr_debug("in %s\n", __func__);
 58         mmio_reset_data(tr);
 59 }
 60 
 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 
 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)
105 {
106         struct header_iter *hiter;
107         struct trace_seq *s = &iter->seq;
108 
109         trace_seq_printf(s, "VERSION 20070824\n");
110 
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 unsigned long count_overruns(struct trace_iterator *iter)
128 {
129         unsigned long cnt = atomic_xchg(&dropped_count, 0);
130         unsigned long over = ring_buffer_overruns(iter->tr->buffer);
131 
132         if (over > prev_overruns)
133                 cnt += over - prev_overruns;
134         prev_overruns = over;
135         return cnt;
136 }
137 
138 static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp,
139                                 char __user *ubuf, size_t cnt, loff_t *ppos)
140 {
141         ssize_t ret;
142         struct header_iter *hiter = iter->private;
143         struct trace_seq *s = &iter->seq;
144         unsigned long n;
145 
146         n = count_overruns(iter);
147         if (n) {
148                 /* XXX: This is later than where events were lost. */
149                 trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
150                 if (!overrun_detected)
151                         pr_warning("mmiotrace has lost events.\n");
152                 overrun_detected = true;
153                 goto print_out;
154         }
155 
156         if (!hiter)
157                 return 0;
158 
159         mmio_print_pcidev(s, hiter->dev);
160         hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
161 
162         if (!hiter->dev) {
163                 destroy_header_iter(hiter);
164                 iter->private = NULL;
165         }
166 
167 print_out:
168         ret = trace_seq_to_user(s, ubuf, cnt);
169         return (ret == -EBUSY) ? 0 : ret;
170 }
171 
172 static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
173 {
174         struct trace_entry *entry = iter->ent;
175         struct trace_mmiotrace_rw *field;
176         struct mmiotrace_rw *rw;
177         struct trace_seq *s     = &iter->seq;
178         unsigned long long t    = ns2usecs(iter->ts);
179         unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
180         unsigned secs           = (unsigned long)t;
181         int ret = 1;
182 
183         trace_assign_type(field, entry);
184         rw = &field->rw;
185 
186         switch (rw->opcode) {
187         case MMIO_READ:
188                 ret = trace_seq_printf(s,
189                         "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
190                         rw->width, secs, usec_rem, rw->map_id,
191                         (unsigned long long)rw->phys,
192                         rw->value, rw->pc, 0);
193                 break;
194         case MMIO_WRITE:
195                 ret = trace_seq_printf(s,
196                         "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
197                         rw->width, secs, usec_rem, rw->map_id,
198                         (unsigned long long)rw->phys,
199                         rw->value, rw->pc, 0);
200                 break;
201         case MMIO_UNKNOWN_OP:
202                 ret = trace_seq_printf(s,
203                         "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx,"
204                         "%02lx 0x%lx %d\n",
205                         secs, usec_rem, rw->map_id,
206                         (unsigned long long)rw->phys,
207                         (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
208                         (rw->value >> 0) & 0xff, rw->pc, 0);
209                 break;
210         default:
211                 ret = trace_seq_printf(s, "rw what?\n");
212                 break;
213         }
214         if (ret)
215                 return TRACE_TYPE_HANDLED;
216         return TRACE_TYPE_PARTIAL_LINE;
217 }
218 
219 static enum print_line_t mmio_print_map(struct trace_iterator *iter)
220 {
221         struct trace_entry *entry = iter->ent;
222         struct trace_mmiotrace_map *field;
223         struct mmiotrace_map *m;
224         struct trace_seq *s     = &iter->seq;
225         unsigned long long t    = ns2usecs(iter->ts);
226         unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
227         unsigned secs           = (unsigned long)t;
228         int ret;
229 
230         trace_assign_type(field, entry);
231         m = &field->map;
232 
233         switch (m->opcode) {
234         case MMIO_PROBE:
235                 ret = trace_seq_printf(s,
236                         "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
237                         secs, usec_rem, m->map_id,
238                         (unsigned long long)m->phys, m->virt, m->len,
239                         0UL, 0);
240                 break;
241         case MMIO_UNPROBE:
242                 ret = trace_seq_printf(s,
243                         "UNMAP %u.%06lu %d 0x%lx %d\n",
244                         secs, usec_rem, m->map_id, 0UL, 0);
245                 break;
246         default:
247                 ret = trace_seq_printf(s, "map what?\n");
248                 break;
249         }
250         if (ret)
251                 return TRACE_TYPE_HANDLED;
252         return TRACE_TYPE_PARTIAL_LINE;
253 }
254 
255 static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
256 {
257         struct trace_entry *entry = iter->ent;
258         struct print_entry *print = (struct print_entry *)entry;
259         const char *msg         = print->buf;
260         struct trace_seq *s     = &iter->seq;
261         unsigned long long t    = ns2usecs(iter->ts);
262         unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
263         unsigned secs           = (unsigned long)t;
264         int ret;
265 
266         /* The trailing newline must be in the message. */
267         ret = trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg);
268         if (!ret)
269                 return TRACE_TYPE_PARTIAL_LINE;
270 
271         return TRACE_TYPE_HANDLED;
272 }
273 
274 static enum print_line_t mmio_print_line(struct trace_iterator *iter)
275 {
276         switch (iter->ent->type) {
277         case TRACE_MMIO_RW:
278                 return mmio_print_rw(iter);
279         case TRACE_MMIO_MAP:
280                 return mmio_print_map(iter);
281         case TRACE_PRINT:
282                 return mmio_print_mark(iter);
283         default:
284                 return TRACE_TYPE_HANDLED; /* ignore unknown entries */
285         }
286 }
287 
288 static struct tracer mmio_tracer __read_mostly =
289 {
290         .name           = "mmiotrace",
291         .init           = mmio_trace_init,
292         .reset          = mmio_trace_reset,
293         .start          = mmio_trace_start,
294         .pipe_open      = mmio_pipe_open,
295         .close          = mmio_close,
296         .read           = mmio_read,
297         .print_line     = mmio_print_line,
298 };
299 
300 __init static int init_mmio_trace(void)
301 {
302         return register_tracer(&mmio_tracer);
303 }
304 device_initcall(init_mmio_trace);
305 
306 static void __trace_mmiotrace_rw(struct trace_array *tr,
307                                 struct trace_array_cpu *data,
308                                 struct mmiotrace_rw *rw)
309 {
310         struct ftrace_event_call *call = &event_mmiotrace_rw;
311         struct ring_buffer *buffer = tr->buffer;
312         struct ring_buffer_event *event;
313         struct trace_mmiotrace_rw *entry;
314         int pc = preempt_count();
315 
316         event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW,
317                                           sizeof(*entry), 0, pc);
318         if (!event) {
319                 atomic_inc(&dropped_count);
320                 return;
321         }
322         entry   = ring_buffer_event_data(event);
323         entry->rw                       = *rw;
324 
325         if (!filter_check_discard(call, entry, buffer, event))
326                 trace_buffer_unlock_commit(buffer, event, 0, pc);
327 }
328 
329 void mmio_trace_rw(struct mmiotrace_rw *rw)
330 {
331         struct trace_array *tr = mmio_trace_array;
332         struct trace_array_cpu *data = tr->data[smp_processor_id()];
333         __trace_mmiotrace_rw(tr, data, rw);
334 }
335 
336 static void __trace_mmiotrace_map(struct trace_array *tr,
337                                 struct trace_array_cpu *data,
338                                 struct mmiotrace_map *map)
339 {
340         struct ftrace_event_call *call = &event_mmiotrace_map;
341         struct ring_buffer *buffer = tr->buffer;
342         struct ring_buffer_event *event;
343         struct trace_mmiotrace_map *entry;
344         int pc = preempt_count();
345 
346         event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP,
347                                           sizeof(*entry), 0, pc);
348         if (!event) {
349                 atomic_inc(&dropped_count);
350                 return;
351         }
352         entry   = ring_buffer_event_data(event);
353         entry->map                      = *map;
354 
355         if (!filter_check_discard(call, entry, buffer, event))
356                 trace_buffer_unlock_commit(buffer, event, 0, pc);
357 }
358 
359 void mmio_trace_mapping(struct mmiotrace_map *map)
360 {
361         struct trace_array *tr = mmio_trace_array;
362         struct trace_array_cpu *data;
363 
364         preempt_disable();
365         data = tr->data[smp_processor_id()];
366         __trace_mmiotrace_map(tr, data, map);
367         preempt_enable();
368 }
369 
370 int mmio_trace_printk(const char *fmt, va_list args)
371 {
372         return trace_vprintk(0, fmt, args);
373 }
374 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp