2 * Memory mapped I/O tracing
4 * Copyright (C) 2008 Pekka Paalanen <pq@iki.fi>
9 #include <linux/kernel.h>
10 #include <linux/mmiotrace.h>
11 #include <linux/pci.h>
19 static struct trace_array *mmio_trace_array;
21 static void mmio_reset_data(struct trace_array *tr)
25 tr->time_start = ftrace_now(tr->cpu);
27 for_each_online_cpu(cpu)
28 tracing_reset(tr->data[cpu]);
31 static void mmio_trace_init(struct trace_array *tr)
33 pr_debug("in %s\n", __func__);
34 mmio_trace_array = tr;
41 static void mmio_trace_reset(struct trace_array *tr)
43 pr_debug("in %s\n", __func__);
47 mmio_trace_array = NULL;
50 static void mmio_trace_ctrl_update(struct trace_array *tr)
52 pr_debug("in %s\n", __func__);
61 static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
65 resource_size_t start, end;
66 const struct pci_driver *drv = pci_dev_driver(dev);
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);
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?
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)));
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);
90 ret += trace_seq_printf(s, " %s\n", drv->name);
92 ret += trace_seq_printf(s, " \n");
96 static void destroy_header_iter(struct header_iter *hiter)
100 pci_dev_put(hiter->dev);
104 static void mmio_pipe_open(struct trace_iterator *iter)
106 struct header_iter *hiter;
107 struct trace_seq *s = &iter->seq;
109 trace_seq_printf(s, "VERSION 20070824\n");
111 hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
115 hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
116 iter->private = hiter;
119 /* XXX: This is not called when the pipe is closed! */
120 static void mmio_close(struct trace_iterator *iter)
122 struct header_iter *hiter = iter->private;
123 destroy_header_iter(hiter);
124 iter->private = NULL;
127 static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp,
128 char __user *ubuf, size_t cnt, loff_t *ppos)
131 struct header_iter *hiter = iter->private;
132 struct trace_seq *s = &iter->seq;
137 mmio_print_pcidev(s, hiter->dev);
138 hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
141 destroy_header_iter(hiter);
142 iter->private = NULL;
145 ret = trace_seq_to_user(s, ubuf, cnt);
146 return (ret == -EBUSY) ? 0 : ret;
149 static int mmio_print_rw(struct trace_iterator *iter)
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;
159 switch (entry->mmiorw.opcode) {
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,
164 rw->value, rw->pc, 0);
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,
170 rw->value, rw->pc, 0);
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,
177 (rw->value >> 0) & 0xff, rw->pc, 0);
180 ret = trace_seq_printf(s, "rw what?\n");
188 static int mmio_print_map(struct trace_iterator *iter)
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;
198 switch (entry->mmiorw.opcode) {
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,
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);
211 ret = trace_seq_printf(s, "map what?\n");
219 /* return 0 to abort printing without consuming current entry in pipe mode */
220 static int mmio_print_line(struct trace_iterator *iter)
222 switch (iter->ent->type) {
224 return mmio_print_rw(iter);
226 return mmio_print_map(iter);
228 return 1; /* ignore unknown entries */
232 static struct tracer mmio_tracer __read_mostly =
235 .init = mmio_trace_init,
236 .reset = mmio_trace_reset,
237 .pipe_open = mmio_pipe_open,
240 .ctrl_update = mmio_trace_ctrl_update,
241 .print_line = mmio_print_line,
244 __init static int init_mmio_trace(void)
246 return register_tracer(&mmio_tracer);
248 device_initcall(init_mmio_trace);
250 void mmio_trace_rw(struct mmiotrace_rw *rw)
252 struct trace_array *tr = mmio_trace_array;
253 struct trace_array_cpu *data = tr->data[smp_processor_id()];
254 __trace_mmiotrace_rw(tr, data, rw);
257 void mmio_trace_mapping(struct mmiotrace_map *map)
259 struct trace_array *tr = mmio_trace_array;
260 struct trace_array_cpu *data;
263 data = tr->data[smp_processor_id()];
264 __trace_mmiotrace_map(tr, data, map);