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

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  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/slab.h>
 13 #include <linux/time.h>
 14 
 15 #include <linux/atomic.h>
 16 
 17 #include "trace.h"
 18 #include "trace_output.h"
 19 
 20 struct header_iter {
 21         struct pci_dev *dev;
 22 };
 23 
 24 static struct trace_array *mmio_trace_array;
 25 static bool overrun_detected;
 26 static unsigned long prev_overruns;
 27 static atomic_t dropped_count;
 28 
 29 static void mmio_reset_data(struct trace_array *tr)
 30 {
 31         overrun_detected = false;
 32         prev_overruns = 0;
 33 
 34         tracing_reset_online_cpus(&tr->trace_buffer);
 35 }
 36 
 37 static int mmio_trace_init(struct trace_array *tr)
 38 {
 39         pr_debug("in %s\n", __func__);
 40         mmio_trace_array = tr;
 41 
 42         mmio_reset_data(tr);
 43         enable_mmiotrace();
 44         return 0;
 45 }
 46 
 47 static void mmio_trace_reset(struct trace_array *tr)
 48 {
 49         pr_debug("in %s\n", __func__);
 50 
 51         disable_mmiotrace();
 52         mmio_reset_data(tr);
 53         mmio_trace_array = NULL;
 54 }
 55 
 56 static void mmio_trace_start(struct trace_array *tr)
 57 {
 58         pr_debug("in %s\n", __func__);
 59         mmio_reset_data(tr);
 60 }
 61 
 62 static void mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
 63 {
 64         int i;
 65         resource_size_t start, end;
 66         const struct pci_driver *drv = pci_dev_driver(dev);
 67 
 68         trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
 69                          dev->bus->number, dev->devfn,
 70                          dev->vendor, dev->device, dev->irq);
 71         /*
 72          * XXX: is pci_resource_to_user() appropriate, since we are
 73          * supposed to interpret the __ioremap() phys_addr argument based on
 74          * these printed values?
 75          */
 76         for (i = 0; i < 7; i++) {
 77                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 78                 trace_seq_printf(s, " %llx",
 79                         (unsigned long long)(start |
 80                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 81         }
 82         for (i = 0; i < 7; i++) {
 83                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 84                 trace_seq_printf(s, " %llx",
 85                         dev->resource[i].start < dev->resource[i].end ?
 86                         (unsigned long long)(end - start) + 1 : 0);
 87         }
 88         if (drv)
 89                 trace_seq_printf(s, " %s\n", drv->name);
 90         else
 91                 trace_seq_puts(s, " \n");
 92 }
 93 
 94 static void destroy_header_iter(struct header_iter *hiter)
 95 {
 96         if (!hiter)
 97                 return;
 98         pci_dev_put(hiter->dev);
 99         kfree(hiter);
100 }
101 
102 static void mmio_pipe_open(struct trace_iterator *iter)
103 {
104         struct header_iter *hiter;
105         struct trace_seq *s = &iter->seq;
106 
107         trace_seq_puts(s, "VERSION 20070824\n");
108 
109         hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
110         if (!hiter)
111                 return;
112 
113         hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
114         iter->private = hiter;
115 }
116 
117 /* XXX: This is not called when the pipe is closed! */
118 static void mmio_close(struct trace_iterator *iter)
119 {
120         struct header_iter *hiter = iter->private;
121         destroy_header_iter(hiter);
122         iter->private = NULL;
123 }
124 
125 static unsigned long count_overruns(struct trace_iterator *iter)
126 {
127         unsigned long cnt = atomic_xchg(&dropped_count, 0);
128         unsigned long over = ring_buffer_overruns(iter->trace_buffer->buffer);
129 
130         if (over > prev_overruns)
131                 cnt += over - prev_overruns;
132         prev_overruns = over;
133         return cnt;
134 }
135 
136 static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp,
137                                 char __user *ubuf, size_t cnt, loff_t *ppos)
138 {
139         ssize_t ret;
140         struct header_iter *hiter = iter->private;
141         struct trace_seq *s = &iter->seq;
142         unsigned long n;
143 
144         n = count_overruns(iter);
145         if (n) {
146                 /* XXX: This is later than where events were lost. */
147                 trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
148                 if (!overrun_detected)
149                         pr_warning("mmiotrace has lost events.\n");
150                 overrun_detected = true;
151                 goto print_out;
152         }
153 
154         if (!hiter)
155                 return 0;
156 
157         mmio_print_pcidev(s, hiter->dev);
158         hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
159 
160         if (!hiter->dev) {
161                 destroy_header_iter(hiter);
162                 iter->private = NULL;
163         }
164 
165 print_out:
166         ret = trace_seq_to_user(s, ubuf, cnt);
167         return (ret == -EBUSY) ? 0 : ret;
168 }
169 
170 static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
171 {
172         struct trace_entry *entry = iter->ent;
173         struct trace_mmiotrace_rw *field;
174         struct mmiotrace_rw *rw;
175         struct trace_seq *s     = &iter->seq;
176         unsigned long long t    = ns2usecs(iter->ts);
177         unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
178         unsigned secs           = (unsigned long)t;
179 
180         trace_assign_type(field, entry);
181         rw = &field->rw;
182 
183         switch (rw->opcode) {
184         case MMIO_READ:
185                 trace_seq_printf(s,
186                         "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
187                         rw->width, secs, usec_rem, rw->map_id,
188                         (unsigned long long)rw->phys,
189                         rw->value, rw->pc, 0);
190                 break;
191         case MMIO_WRITE:
192                 trace_seq_printf(s,
193                         "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
194                         rw->width, secs, usec_rem, rw->map_id,
195                         (unsigned long long)rw->phys,
196                         rw->value, rw->pc, 0);
197                 break;
198         case MMIO_UNKNOWN_OP:
199                 trace_seq_printf(s,
200                         "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx,"
201                         "%02lx 0x%lx %d\n",
202                         secs, usec_rem, rw->map_id,
203                         (unsigned long long)rw->phys,
204                         (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
205                         (rw->value >> 0) & 0xff, rw->pc, 0);
206                 break;
207         default:
208                 trace_seq_puts(s, "rw what?\n");
209                 break;
210         }
211 
212         return trace_handle_return(s);
213 }
214 
215 static enum print_line_t mmio_print_map(struct trace_iterator *iter)
216 {
217         struct trace_entry *entry = iter->ent;
218         struct trace_mmiotrace_map *field;
219         struct mmiotrace_map *m;
220         struct trace_seq *s     = &iter->seq;
221         unsigned long long t    = ns2usecs(iter->ts);
222         unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
223         unsigned secs           = (unsigned long)t;
224 
225         trace_assign_type(field, entry);
226         m = &field->map;
227 
228         switch (m->opcode) {
229         case MMIO_PROBE:
230                 trace_seq_printf(s,
231                         "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
232                         secs, usec_rem, m->map_id,
233                         (unsigned long long)m->phys, m->virt, m->len,
234                         0UL, 0);
235                 break;
236         case MMIO_UNPROBE:
237                 trace_seq_printf(s,
238                         "UNMAP %u.%06lu %d 0x%lx %d\n",
239                         secs, usec_rem, m->map_id, 0UL, 0);
240                 break;
241         default:
242                 trace_seq_puts(s, "map what?\n");
243                 break;
244         }
245 
246         return trace_handle_return(s);
247 }
248 
249 static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
250 {
251         struct trace_entry *entry = iter->ent;
252         struct print_entry *print = (struct print_entry *)entry;
253         const char *msg         = print->buf;
254         struct trace_seq *s     = &iter->seq;
255         unsigned long long t    = ns2usecs(iter->ts);
256         unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
257         unsigned secs           = (unsigned long)t;
258 
259         /* The trailing newline must be in the message. */
260         trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg);
261 
262         return trace_handle_return(s);
263 }
264 
265 static enum print_line_t mmio_print_line(struct trace_iterator *iter)
266 {
267         switch (iter->ent->type) {
268         case TRACE_MMIO_RW:
269                 return mmio_print_rw(iter);
270         case TRACE_MMIO_MAP:
271                 return mmio_print_map(iter);
272         case TRACE_PRINT:
273                 return mmio_print_mark(iter);
274         default:
275                 return TRACE_TYPE_HANDLED; /* ignore unknown entries */
276         }
277 }
278 
279 static struct tracer mmio_tracer __read_mostly =
280 {
281         .name           = "mmiotrace",
282         .init           = mmio_trace_init,
283         .reset          = mmio_trace_reset,
284         .start          = mmio_trace_start,
285         .pipe_open      = mmio_pipe_open,
286         .close          = mmio_close,
287         .read           = mmio_read,
288         .print_line     = mmio_print_line,
289 };
290 
291 __init static int init_mmio_trace(void)
292 {
293         return register_tracer(&mmio_tracer);
294 }
295 device_initcall(init_mmio_trace);
296 
297 static void __trace_mmiotrace_rw(struct trace_array *tr,
298                                 struct trace_array_cpu *data,
299                                 struct mmiotrace_rw *rw)
300 {
301         struct ftrace_event_call *call = &event_mmiotrace_rw;
302         struct ring_buffer *buffer = tr->trace_buffer.buffer;
303         struct ring_buffer_event *event;
304         struct trace_mmiotrace_rw *entry;
305         int pc = preempt_count();
306 
307         event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW,
308                                           sizeof(*entry), 0, pc);
309         if (!event) {
310                 atomic_inc(&dropped_count);
311                 return;
312         }
313         entry   = ring_buffer_event_data(event);
314         entry->rw                       = *rw;
315 
316         if (!call_filter_check_discard(call, entry, buffer, event))
317                 trace_buffer_unlock_commit(buffer, event, 0, pc);
318 }
319 
320 void mmio_trace_rw(struct mmiotrace_rw *rw)
321 {
322         struct trace_array *tr = mmio_trace_array;
323         struct trace_array_cpu *data = per_cpu_ptr(tr->trace_buffer.data, smp_processor_id());
324         __trace_mmiotrace_rw(tr, data, rw);
325 }
326 
327 static void __trace_mmiotrace_map(struct trace_array *tr,
328                                 struct trace_array_cpu *data,
329                                 struct mmiotrace_map *map)
330 {
331         struct ftrace_event_call *call = &event_mmiotrace_map;
332         struct ring_buffer *buffer = tr->trace_buffer.buffer;
333         struct ring_buffer_event *event;
334         struct trace_mmiotrace_map *entry;
335         int pc = preempt_count();
336 
337         event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP,
338                                           sizeof(*entry), 0, pc);
339         if (!event) {
340                 atomic_inc(&dropped_count);
341                 return;
342         }
343         entry   = ring_buffer_event_data(event);
344         entry->map                      = *map;
345 
346         if (!call_filter_check_discard(call, entry, buffer, event))
347                 trace_buffer_unlock_commit(buffer, event, 0, pc);
348 }
349 
350 void mmio_trace_mapping(struct mmiotrace_map *map)
351 {
352         struct trace_array *tr = mmio_trace_array;
353         struct trace_array_cpu *data;
354 
355         preempt_disable();
356         data = per_cpu_ptr(tr->trace_buffer.data, smp_processor_id());
357         __trace_mmiotrace_map(tr, data, map);
358         preempt_enable();
359 }
360 
361 int mmio_trace_printk(const char *fmt, va_list args)
362 {
363         return trace_vprintk(0, fmt, args);
364 }
365 

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