| 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 | |
| 12 | #include "trace.h" |
| 13 | |
| 14 | static struct trace_array *mmio_trace_array; |
| 15 | |
| 16 | static void mmio_reset_data(struct trace_array *tr) |
| 17 | { |
| 18 | int cpu; |
| 19 | |
| 20 | tr->time_start = ftrace_now(tr->cpu); |
| 21 | |
| 22 | for_each_online_cpu(cpu) |
| 23 | tracing_reset(tr->data[cpu]); |
| 24 | } |
| 25 | |
| 26 | static void mmio_trace_init(struct trace_array *tr) |
| 27 | { |
| 28 | pr_debug("in %s\n", __func__); |
| 29 | mmio_trace_array = tr; |
| 30 | if (tr->ctrl) { |
| 31 | mmio_reset_data(tr); |
| 32 | enable_mmiotrace(); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static void mmio_trace_reset(struct trace_array *tr) |
| 37 | { |
| 38 | pr_debug("in %s\n", __func__); |
| 39 | if (tr->ctrl) |
| 40 | disable_mmiotrace(); |
| 41 | mmio_reset_data(tr); |
| 42 | mmio_trace_array = NULL; |
| 43 | } |
| 44 | |
| 45 | static void mmio_trace_ctrl_update(struct trace_array *tr) |
| 46 | { |
| 47 | pr_debug("in %s\n", __func__); |
| 48 | if (tr->ctrl) { |
| 49 | mmio_reset_data(tr); |
| 50 | enable_mmiotrace(); |
| 51 | } else { |
| 52 | disable_mmiotrace(); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | /* XXX: This is not called for trace_pipe file! */ |
| 57 | void mmio_print_header(struct trace_iterator *iter) |
| 58 | { |
| 59 | struct trace_seq *s = &iter->seq; |
| 60 | trace_seq_printf(s, "VERSION broken 20070824\n"); |
| 61 | /* TODO: print /proc/bus/pci/devices contents as PCIDEV lines */ |
| 62 | } |
| 63 | |
| 64 | static int mmio_print_rw(struct trace_iterator *iter) |
| 65 | { |
| 66 | struct trace_entry *entry = iter->ent; |
| 67 | struct mmiotrace_rw *rw = &entry->mmiorw; |
| 68 | struct trace_seq *s = &iter->seq; |
| 69 | unsigned long long t = ns2usecs(entry->t); |
| 70 | unsigned long usec_rem = do_div(t, 1000000ULL); |
| 71 | unsigned secs = (unsigned long)t; |
| 72 | int ret = 1; |
| 73 | |
| 74 | switch (entry->mmiorw.opcode) { |
| 75 | case MMIO_READ: |
| 76 | ret = trace_seq_printf(s, |
| 77 | "R %d %lu.%06lu %d 0x%lx 0x%lx 0x%lx %d\n", |
| 78 | rw->width, secs, usec_rem, rw->map_id, rw->phys, |
| 79 | rw->value, rw->pc, entry->pid); |
| 80 | break; |
| 81 | case MMIO_WRITE: |
| 82 | ret = trace_seq_printf(s, |
| 83 | "W %d %lu.%06lu %d 0x%lx 0x%lx 0x%lx %d\n", |
| 84 | rw->width, secs, usec_rem, rw->map_id, rw->phys, |
| 85 | rw->value, rw->pc, entry->pid); |
| 86 | break; |
| 87 | case MMIO_UNKNOWN_OP: |
| 88 | ret = trace_seq_printf(s, |
| 89 | "UNKNOWN %lu.%06lu %d 0x%lx %02x,%02x,%02x 0x%lx %d\n", |
| 90 | secs, usec_rem, rw->map_id, rw->phys, |
| 91 | (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff, |
| 92 | (rw->value >> 0) & 0xff, rw->pc, entry->pid); |
| 93 | break; |
| 94 | default: |
| 95 | ret = trace_seq_printf(s, "rw what?\n"); |
| 96 | break; |
| 97 | } |
| 98 | if (ret) |
| 99 | return 1; |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static int mmio_print_map(struct trace_iterator *iter) |
| 104 | { |
| 105 | struct trace_entry *entry = iter->ent; |
| 106 | struct mmiotrace_map *m = &entry->mmiomap; |
| 107 | struct trace_seq *s = &iter->seq; |
| 108 | unsigned long long t = ns2usecs(entry->t); |
| 109 | unsigned long usec_rem = do_div(t, 1000000ULL); |
| 110 | unsigned secs = (unsigned long)t; |
| 111 | int ret = 1; |
| 112 | |
| 113 | switch (entry->mmiorw.opcode) { |
| 114 | case MMIO_PROBE: |
| 115 | ret = trace_seq_printf(s, |
| 116 | "MAP %lu.%06lu %d 0x%lx 0x%lx 0x%lx 0x%lx %d\n", |
| 117 | secs, usec_rem, m->map_id, m->phys, m->virt, m->len, |
| 118 | 0UL, entry->pid); |
| 119 | break; |
| 120 | case MMIO_UNPROBE: |
| 121 | ret = trace_seq_printf(s, |
| 122 | "UNMAP %lu.%06lu %d 0x%lx %d\n", |
| 123 | secs, usec_rem, m->map_id, 0UL, entry->pid); |
| 124 | break; |
| 125 | default: |
| 126 | ret = trace_seq_printf(s, "map what?\n"); |
| 127 | break; |
| 128 | } |
| 129 | if (ret) |
| 130 | return 1; |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | /* return 0 to abort printing without consuming current entry in pipe mode */ |
| 135 | static int mmio_print_line(struct trace_iterator *iter) |
| 136 | { |
| 137 | switch (iter->ent->type) { |
| 138 | case TRACE_MMIO_RW: |
| 139 | return mmio_print_rw(iter); |
| 140 | case TRACE_MMIO_MAP: |
| 141 | return mmio_print_map(iter); |
| 142 | default: |
| 143 | return 1; /* ignore unknown entries */ |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | static struct tracer mmio_tracer __read_mostly = |
| 148 | { |
| 149 | .name = "mmiotrace", |
| 150 | .init = mmio_trace_init, |
| 151 | .reset = mmio_trace_reset, |
| 152 | .open = mmio_print_header, |
| 153 | .ctrl_update = mmio_trace_ctrl_update, |
| 154 | .print_line = mmio_print_line, |
| 155 | }; |
| 156 | |
| 157 | __init static int init_mmio_trace(void) |
| 158 | { |
| 159 | return register_tracer(&mmio_tracer); |
| 160 | } |
| 161 | device_initcall(init_mmio_trace); |
| 162 | |
| 163 | void mmio_trace_rw(struct mmiotrace_rw *rw) |
| 164 | { |
| 165 | struct trace_array *tr = mmio_trace_array; |
| 166 | struct trace_array_cpu *data = tr->data[smp_processor_id()]; |
| 167 | __trace_mmiotrace_rw(tr, data, rw); |
| 168 | } |
| 169 | |
| 170 | void mmio_trace_mapping(struct mmiotrace_map *map) |
| 171 | { |
| 172 | struct trace_array *tr = mmio_trace_array; |
| 173 | struct trace_array_cpu *data; |
| 174 | |
| 175 | preempt_disable(); |
| 176 | data = tr->data[smp_processor_id()]; |
| 177 | __trace_mmiotrace_map(tr, data, map); |
| 178 | preempt_enable(); |
| 179 | } |