Now that the underlining ring buffer for ftrace now hold variable length entries, we can take advantage of this by only storing the size of the actual event into the buffer. This happens to increase the number of entries in the buffer dramatically. We can also get rid of the "trace_cont" operation, but I'm keeping that until we have no more users. Some of the ftrace tracers can now change their code to adapt to this new feature. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
372 lines
8.7 KiB
C
372 lines
8.7 KiB
C
/*
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* Memory mapped I/O tracing
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*
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* Copyright (C) 2008 Pekka Paalanen <pq@iki.fi>
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*/
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#define DEBUG 1
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#include <linux/kernel.h>
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#include <linux/mmiotrace.h>
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#include <linux/pci.h>
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#include "trace.h"
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struct header_iter {
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struct pci_dev *dev;
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};
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static struct trace_array *mmio_trace_array;
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static bool overrun_detected;
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static void mmio_reset_data(struct trace_array *tr)
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{
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int cpu;
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overrun_detected = false;
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tr->time_start = ftrace_now(tr->cpu);
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for_each_online_cpu(cpu)
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tracing_reset(tr, cpu);
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}
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static void mmio_trace_init(struct trace_array *tr)
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{
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pr_debug("in %s\n", __func__);
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mmio_trace_array = tr;
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if (tr->ctrl) {
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mmio_reset_data(tr);
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enable_mmiotrace();
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}
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}
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static void mmio_trace_reset(struct trace_array *tr)
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{
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pr_debug("in %s\n", __func__);
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if (tr->ctrl)
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disable_mmiotrace();
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mmio_reset_data(tr);
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mmio_trace_array = NULL;
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}
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static void mmio_trace_ctrl_update(struct trace_array *tr)
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{
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pr_debug("in %s\n", __func__);
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if (tr->ctrl) {
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mmio_reset_data(tr);
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enable_mmiotrace();
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} else {
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disable_mmiotrace();
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}
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}
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static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
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{
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int ret = 0;
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int i;
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resource_size_t start, end;
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const struct pci_driver *drv = pci_dev_driver(dev);
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/* XXX: incomplete checks for trace_seq_printf() return value */
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ret += trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x",
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dev->bus->number, dev->devfn,
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dev->vendor, dev->device, dev->irq);
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/*
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* XXX: is pci_resource_to_user() appropriate, since we are
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* supposed to interpret the __ioremap() phys_addr argument based on
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* these printed values?
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*/
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for (i = 0; i < 7; i++) {
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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ret += trace_seq_printf(s, " %llx",
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(unsigned long long)(start |
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(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
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}
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for (i = 0; i < 7; i++) {
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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ret += trace_seq_printf(s, " %llx",
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dev->resource[i].start < dev->resource[i].end ?
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(unsigned long long)(end - start) + 1 : 0);
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}
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if (drv)
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ret += trace_seq_printf(s, " %s\n", drv->name);
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else
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ret += trace_seq_printf(s, " \n");
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return ret;
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}
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static void destroy_header_iter(struct header_iter *hiter)
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{
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if (!hiter)
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return;
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pci_dev_put(hiter->dev);
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kfree(hiter);
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}
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static void mmio_pipe_open(struct trace_iterator *iter)
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{
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struct header_iter *hiter;
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struct trace_seq *s = &iter->seq;
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trace_seq_printf(s, "VERSION 20070824\n");
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hiter = kzalloc(sizeof(*hiter), GFP_KERNEL);
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if (!hiter)
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return;
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hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
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iter->private = hiter;
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}
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/* XXX: This is not called when the pipe is closed! */
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static void mmio_close(struct trace_iterator *iter)
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{
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struct header_iter *hiter = iter->private;
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destroy_header_iter(hiter);
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iter->private = NULL;
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}
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static unsigned long count_overruns(struct trace_iterator *iter)
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{
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int cpu;
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unsigned long cnt = 0;
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/* FIXME: */
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#if 0
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for_each_online_cpu(cpu) {
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cnt += iter->overrun[cpu];
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iter->overrun[cpu] = 0;
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}
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#endif
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(void)cpu;
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return cnt;
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}
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static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp,
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char __user *ubuf, size_t cnt, loff_t *ppos)
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{
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ssize_t ret;
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struct header_iter *hiter = iter->private;
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struct trace_seq *s = &iter->seq;
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unsigned long n;
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n = count_overruns(iter);
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if (n) {
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/* XXX: This is later than where events were lost. */
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trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n);
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if (!overrun_detected)
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pr_warning("mmiotrace has lost events.\n");
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overrun_detected = true;
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goto print_out;
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}
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if (!hiter)
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return 0;
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mmio_print_pcidev(s, hiter->dev);
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hiter->dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, hiter->dev);
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if (!hiter->dev) {
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destroy_header_iter(hiter);
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iter->private = NULL;
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}
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print_out:
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ret = trace_seq_to_user(s, ubuf, cnt);
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return (ret == -EBUSY) ? 0 : ret;
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}
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static int mmio_print_rw(struct trace_iterator *iter)
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{
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struct trace_entry *entry = iter->ent;
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struct trace_mmiotrace_rw *field =
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(struct trace_mmiotrace_rw *)entry;
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struct mmiotrace_rw *rw = &field->rw;
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struct trace_seq *s = &iter->seq;
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unsigned long long t = ns2usecs(iter->ts);
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unsigned long usec_rem = do_div(t, 1000000ULL);
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unsigned secs = (unsigned long)t;
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int ret = 1;
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switch (rw->opcode) {
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case MMIO_READ:
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ret = trace_seq_printf(s,
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"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
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rw->width, secs, usec_rem, rw->map_id,
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(unsigned long long)rw->phys,
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rw->value, rw->pc, 0);
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break;
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case MMIO_WRITE:
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ret = trace_seq_printf(s,
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"W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
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rw->width, secs, usec_rem, rw->map_id,
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(unsigned long long)rw->phys,
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rw->value, rw->pc, 0);
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break;
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case MMIO_UNKNOWN_OP:
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ret = trace_seq_printf(s,
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"UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
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secs, usec_rem, rw->map_id,
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(unsigned long long)rw->phys,
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(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
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(rw->value >> 0) & 0xff, rw->pc, 0);
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break;
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default:
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ret = trace_seq_printf(s, "rw what?\n");
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break;
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}
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if (ret)
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return 1;
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return 0;
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}
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static int mmio_print_map(struct trace_iterator *iter)
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{
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struct trace_entry *entry = iter->ent;
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struct mmiotrace_map *m = (struct mmiotrace_map *)entry;
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struct trace_seq *s = &iter->seq;
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unsigned long long t = ns2usecs(iter->ts);
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unsigned long usec_rem = do_div(t, 1000000ULL);
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unsigned secs = (unsigned long)t;
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int ret = 1;
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switch (m->opcode) {
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case MMIO_PROBE:
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ret = trace_seq_printf(s,
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"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
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secs, usec_rem, m->map_id,
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(unsigned long long)m->phys, m->virt, m->len,
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0UL, 0);
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break;
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case MMIO_UNPROBE:
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ret = trace_seq_printf(s,
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"UNMAP %lu.%06lu %d 0x%lx %d\n",
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secs, usec_rem, m->map_id, 0UL, 0);
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break;
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default:
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ret = trace_seq_printf(s, "map what?\n");
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break;
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}
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if (ret)
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return 1;
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return 0;
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}
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static int mmio_print_mark(struct trace_iterator *iter)
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{
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struct trace_entry *entry = iter->ent;
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struct print_entry *print = (struct print_entry *)entry;
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const char *msg = print->buf;
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struct trace_seq *s = &iter->seq;
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unsigned long long t = ns2usecs(iter->ts);
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unsigned long usec_rem = do_div(t, 1000000ULL);
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unsigned secs = (unsigned long)t;
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int ret;
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/* The trailing newline must be in the message. */
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ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
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if (!ret)
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return 0;
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if (entry->flags & TRACE_FLAG_CONT)
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trace_seq_print_cont(s, iter);
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return 1;
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}
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/* return 0 to abort printing without consuming current entry in pipe mode */
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static int mmio_print_line(struct trace_iterator *iter)
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{
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switch (iter->ent->type) {
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case TRACE_MMIO_RW:
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return mmio_print_rw(iter);
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case TRACE_MMIO_MAP:
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return mmio_print_map(iter);
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case TRACE_PRINT:
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return mmio_print_mark(iter);
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default:
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return 1; /* ignore unknown entries */
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}
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}
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static struct tracer mmio_tracer __read_mostly =
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{
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.name = "mmiotrace",
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.init = mmio_trace_init,
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.reset = mmio_trace_reset,
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.pipe_open = mmio_pipe_open,
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.close = mmio_close,
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.read = mmio_read,
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.ctrl_update = mmio_trace_ctrl_update,
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.print_line = mmio_print_line,
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};
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__init static int init_mmio_trace(void)
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{
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return register_tracer(&mmio_tracer);
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}
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device_initcall(init_mmio_trace);
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static void __trace_mmiotrace_rw(struct trace_array *tr,
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struct trace_array_cpu *data,
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struct mmiotrace_rw *rw)
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{
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struct ring_buffer_event *event;
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struct trace_mmiotrace_rw *entry;
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unsigned long irq_flags;
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event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
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&irq_flags);
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if (!event)
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return;
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entry = ring_buffer_event_data(event);
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tracing_generic_entry_update(&entry->ent, 0);
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entry->ent.type = TRACE_MMIO_RW;
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entry->rw = *rw;
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ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
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trace_wake_up();
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}
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void mmio_trace_rw(struct mmiotrace_rw *rw)
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{
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struct trace_array *tr = mmio_trace_array;
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struct trace_array_cpu *data = tr->data[smp_processor_id()];
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__trace_mmiotrace_rw(tr, data, rw);
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}
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static void __trace_mmiotrace_map(struct trace_array *tr,
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struct trace_array_cpu *data,
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struct mmiotrace_map *map)
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{
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struct ring_buffer_event *event;
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struct trace_mmiotrace_map *entry;
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unsigned long irq_flags;
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event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
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&irq_flags);
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if (!event)
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return;
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entry = ring_buffer_event_data(event);
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tracing_generic_entry_update(&entry->ent, 0);
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entry->ent.type = TRACE_MMIO_MAP;
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entry->map = *map;
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ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
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trace_wake_up();
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}
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void mmio_trace_mapping(struct mmiotrace_map *map)
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{
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struct trace_array *tr = mmio_trace_array;
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struct trace_array_cpu *data;
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preempt_disable();
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data = tr->data[smp_processor_id()];
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__trace_mmiotrace_map(tr, data, map);
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preempt_enable();
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}
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int mmio_trace_printk(const char *fmt, va_list args)
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{
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return trace_vprintk(0, fmt, args);
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}
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