Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 1 | #undef DEBUG |
| 2 | |
| 3 | /* |
| 4 | * ARM performance counter support. |
| 5 | * |
| 6 | * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles |
Will Deacon | 43eab87 | 2010-11-13 19:04:32 +0000 | [diff] [blame] | 7 | * Copyright (C) 2010 ARM Ltd., Will Deacon <will.deacon@arm.com> |
Jean PIHET | 796d129 | 2010-01-26 18:51:05 +0100 | [diff] [blame] | 8 | * |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 9 | * This code is based on the sparc64 perf event code, which is in turn based |
| 10 | * on the x86 code. Callchain code is based on the ARM OProfile backtrace |
| 11 | * code. |
| 12 | */ |
| 13 | #define pr_fmt(fmt) "hw perfevents: " fmt |
| 14 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 15 | #include <linux/kernel.h> |
Will Deacon | 49c006b | 2010-04-29 17:13:24 +0100 | [diff] [blame] | 16 | #include <linux/platform_device.h> |
Jon Hunter | 7be2958 | 2012-05-31 13:05:20 -0500 | [diff] [blame] | 17 | #include <linux/pm_runtime.h> |
Will Deacon | 5505b20 | 2012-07-29 13:09:14 +0100 | [diff] [blame] | 18 | #include <linux/uaccess.h> |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 19 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 20 | #include <asm/irq_regs.h> |
| 21 | #include <asm/pmu.h> |
| 22 | #include <asm/stacktrace.h> |
| 23 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 24 | static int |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 25 | armpmu_map_cache_event(const unsigned (*cache_map) |
| 26 | [PERF_COUNT_HW_CACHE_MAX] |
| 27 | [PERF_COUNT_HW_CACHE_OP_MAX] |
| 28 | [PERF_COUNT_HW_CACHE_RESULT_MAX], |
| 29 | u64 config) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 30 | { |
| 31 | unsigned int cache_type, cache_op, cache_result, ret; |
| 32 | |
| 33 | cache_type = (config >> 0) & 0xff; |
| 34 | if (cache_type >= PERF_COUNT_HW_CACHE_MAX) |
| 35 | return -EINVAL; |
| 36 | |
| 37 | cache_op = (config >> 8) & 0xff; |
| 38 | if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX) |
| 39 | return -EINVAL; |
| 40 | |
| 41 | cache_result = (config >> 16) & 0xff; |
| 42 | if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX) |
| 43 | return -EINVAL; |
| 44 | |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 45 | ret = (int)(*cache_map)[cache_type][cache_op][cache_result]; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 46 | |
| 47 | if (ret == CACHE_OP_UNSUPPORTED) |
| 48 | return -ENOENT; |
| 49 | |
| 50 | return ret; |
| 51 | } |
| 52 | |
| 53 | static int |
Will Deacon | 6dbc002 | 2012-07-29 12:36:28 +0100 | [diff] [blame] | 54 | armpmu_map_hw_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config) |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 55 | { |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 56 | int mapping = (*event_map)[config]; |
| 57 | return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping; |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | static int |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 61 | armpmu_map_raw_event(u32 raw_event_mask, u64 config) |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 62 | { |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 63 | return (int)(config & raw_event_mask); |
| 64 | } |
| 65 | |
Will Deacon | 6dbc002 | 2012-07-29 12:36:28 +0100 | [diff] [blame] | 66 | int |
| 67 | armpmu_map_event(struct perf_event *event, |
| 68 | const unsigned (*event_map)[PERF_COUNT_HW_MAX], |
| 69 | const unsigned (*cache_map) |
| 70 | [PERF_COUNT_HW_CACHE_MAX] |
| 71 | [PERF_COUNT_HW_CACHE_OP_MAX] |
| 72 | [PERF_COUNT_HW_CACHE_RESULT_MAX], |
| 73 | u32 raw_event_mask) |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 74 | { |
| 75 | u64 config = event->attr.config; |
| 76 | |
| 77 | switch (event->attr.type) { |
| 78 | case PERF_TYPE_HARDWARE: |
Will Deacon | 6dbc002 | 2012-07-29 12:36:28 +0100 | [diff] [blame] | 79 | return armpmu_map_hw_event(event_map, config); |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 80 | case PERF_TYPE_HW_CACHE: |
| 81 | return armpmu_map_cache_event(cache_map, config); |
| 82 | case PERF_TYPE_RAW: |
| 83 | return armpmu_map_raw_event(raw_event_mask, config); |
| 84 | } |
| 85 | |
| 86 | return -ENOENT; |
Will Deacon | 84fee97 | 2010-11-13 17:13:56 +0000 | [diff] [blame] | 87 | } |
| 88 | |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 89 | int armpmu_event_set_period(struct perf_event *event) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 90 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 91 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 92 | struct hw_perf_event *hwc = &event->hw; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 93 | s64 left = local64_read(&hwc->period_left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 94 | s64 period = hwc->sample_period; |
| 95 | int ret = 0; |
| 96 | |
Will Deacon | 3581fe0 | 2012-10-17 12:01:34 +0100 | [diff] [blame] | 97 | /* The period may have been changed by PERF_EVENT_IOC_PERIOD */ |
| 98 | if (unlikely(period != hwc->last_period)) |
| 99 | left = period - (hwc->last_period - left); |
| 100 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 101 | if (unlikely(left <= -period)) { |
| 102 | left = period; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 103 | local64_set(&hwc->period_left, left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 104 | hwc->last_period = period; |
| 105 | ret = 1; |
| 106 | } |
| 107 | |
| 108 | if (unlikely(left <= 0)) { |
| 109 | left += period; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 110 | local64_set(&hwc->period_left, left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 111 | hwc->last_period = period; |
| 112 | ret = 1; |
| 113 | } |
| 114 | |
| 115 | if (left > (s64)armpmu->max_period) |
| 116 | left = armpmu->max_period; |
| 117 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 118 | local64_set(&hwc->prev_count, (u64)-left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 119 | |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 120 | armpmu->write_counter(event, (u64)(-left) & 0xffffffff); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 121 | |
| 122 | perf_event_update_userpage(event); |
| 123 | |
| 124 | return ret; |
| 125 | } |
| 126 | |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 127 | u64 armpmu_event_update(struct perf_event *event) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 128 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 129 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 130 | struct hw_perf_event *hwc = &event->hw; |
Will Deacon | a737823 | 2011-03-25 17:12:37 +0100 | [diff] [blame] | 131 | u64 delta, prev_raw_count, new_raw_count; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 132 | |
| 133 | again: |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 134 | prev_raw_count = local64_read(&hwc->prev_count); |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 135 | new_raw_count = armpmu->read_counter(event); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 136 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 137 | if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 138 | new_raw_count) != prev_raw_count) |
| 139 | goto again; |
| 140 | |
Will Deacon | 5727347 | 2012-03-06 17:33:17 +0100 | [diff] [blame] | 141 | delta = (new_raw_count - prev_raw_count) & armpmu->max_period; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 142 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 143 | local64_add(delta, &event->count); |
| 144 | local64_sub(delta, &hwc->period_left); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 145 | |
| 146 | return new_raw_count; |
| 147 | } |
| 148 | |
| 149 | static void |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 150 | armpmu_read(struct perf_event *event) |
| 151 | { |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 152 | armpmu_event_update(event); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | static void |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 156 | armpmu_stop(struct perf_event *event, int flags) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 157 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 158 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 159 | struct hw_perf_event *hwc = &event->hw; |
| 160 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 161 | /* |
| 162 | * ARM pmu always has to update the counter, so ignore |
| 163 | * PERF_EF_UPDATE, see comments in armpmu_start(). |
| 164 | */ |
| 165 | if (!(hwc->state & PERF_HES_STOPPED)) { |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 166 | armpmu->disable(event); |
| 167 | armpmu_event_update(event); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 168 | hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; |
| 169 | } |
| 170 | } |
| 171 | |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 172 | static void armpmu_start(struct perf_event *event, int flags) |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 173 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 174 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 175 | struct hw_perf_event *hwc = &event->hw; |
| 176 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 177 | /* |
| 178 | * ARM pmu always has to reprogram the period, so ignore |
| 179 | * PERF_EF_RELOAD, see the comment below. |
| 180 | */ |
| 181 | if (flags & PERF_EF_RELOAD) |
| 182 | WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE)); |
| 183 | |
| 184 | hwc->state = 0; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 185 | /* |
| 186 | * Set the period again. Some counters can't be stopped, so when we |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 187 | * were stopped we simply disabled the IRQ source and the counter |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 188 | * may have been left counting. If we don't do this step then we may |
| 189 | * get an interrupt too soon or *way* too late if the overflow has |
| 190 | * happened since disabling. |
| 191 | */ |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 192 | armpmu_event_set_period(event); |
| 193 | armpmu->enable(event); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 194 | } |
| 195 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 196 | static void |
| 197 | armpmu_del(struct perf_event *event, int flags) |
| 198 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 199 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 200 | struct pmu_hw_events *hw_events = armpmu->get_hw_events(); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 201 | struct hw_perf_event *hwc = &event->hw; |
| 202 | int idx = hwc->idx; |
| 203 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 204 | armpmu_stop(event, PERF_EF_UPDATE); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 205 | hw_events->events[idx] = NULL; |
| 206 | clear_bit(idx, hw_events->used_mask); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 207 | |
| 208 | perf_event_update_userpage(event); |
| 209 | } |
| 210 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 211 | static int |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 212 | armpmu_add(struct perf_event *event, int flags) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 213 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 214 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 215 | struct pmu_hw_events *hw_events = armpmu->get_hw_events(); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 216 | struct hw_perf_event *hwc = &event->hw; |
| 217 | int idx; |
| 218 | int err = 0; |
| 219 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 220 | perf_pmu_disable(event->pmu); |
Peter Zijlstra | 24cd7f5 | 2010-06-11 17:32:03 +0200 | [diff] [blame] | 221 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 222 | /* If we don't have a space for the counter then finish early. */ |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 223 | idx = armpmu->get_event_idx(hw_events, event); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 224 | if (idx < 0) { |
| 225 | err = idx; |
| 226 | goto out; |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * If there is an event in the counter we are going to use then make |
| 231 | * sure it is disabled. |
| 232 | */ |
| 233 | event->hw.idx = idx; |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 234 | armpmu->disable(event); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 235 | hw_events->events[idx] = event; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 236 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 237 | hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; |
| 238 | if (flags & PERF_EF_START) |
| 239 | armpmu_start(event, PERF_EF_RELOAD); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 240 | |
| 241 | /* Propagate our changes to the userspace mapping. */ |
| 242 | perf_event_update_userpage(event); |
| 243 | |
| 244 | out: |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 245 | perf_pmu_enable(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 246 | return err; |
| 247 | } |
| 248 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 249 | static int |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 250 | validate_event(struct pmu_hw_events *hw_events, |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 251 | struct perf_event *event) |
| 252 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 253 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Mark Rutland | 7b9f72c | 2011-04-27 16:22:21 +0100 | [diff] [blame] | 254 | struct pmu *leader_pmu = event->group_leader->pmu; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 255 | |
Will Deacon | cb2d8b3 | 2013-04-12 19:04:19 +0100 | [diff] [blame] | 256 | if (event->pmu != leader_pmu || event->state < PERF_EVENT_STATE_OFF) |
| 257 | return 1; |
| 258 | |
| 259 | if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec) |
Will Deacon | 65b4711 | 2010-09-02 09:32:08 +0100 | [diff] [blame] | 260 | return 1; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 261 | |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 262 | return armpmu->get_event_idx(hw_events, event) >= 0; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | static int |
| 266 | validate_group(struct perf_event *event) |
| 267 | { |
| 268 | struct perf_event *sibling, *leader = event->group_leader; |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 269 | struct pmu_hw_events fake_pmu; |
Will Deacon | bce34d1 | 2011-11-17 15:05:14 +0000 | [diff] [blame] | 270 | DECLARE_BITMAP(fake_used_mask, ARMPMU_MAX_HWEVENTS); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 271 | |
Will Deacon | bce34d1 | 2011-11-17 15:05:14 +0000 | [diff] [blame] | 272 | /* |
| 273 | * Initialise the fake PMU. We only need to populate the |
| 274 | * used_mask for the purposes of validation. |
| 275 | */ |
| 276 | memset(fake_used_mask, 0, sizeof(fake_used_mask)); |
| 277 | fake_pmu.used_mask = fake_used_mask; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 278 | |
| 279 | if (!validate_event(&fake_pmu, leader)) |
Peter Zijlstra | aa2bc1a | 2011-11-09 17:56:37 +0100 | [diff] [blame] | 280 | return -EINVAL; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 281 | |
| 282 | list_for_each_entry(sibling, &leader->sibling_list, group_entry) { |
| 283 | if (!validate_event(&fake_pmu, sibling)) |
Peter Zijlstra | aa2bc1a | 2011-11-09 17:56:37 +0100 | [diff] [blame] | 284 | return -EINVAL; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 285 | } |
| 286 | |
| 287 | if (!validate_event(&fake_pmu, event)) |
Peter Zijlstra | aa2bc1a | 2011-11-09 17:56:37 +0100 | [diff] [blame] | 288 | return -EINVAL; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
Sudeep KarkadaNagesha | 051f1b1 | 2012-07-31 10:34:25 +0100 | [diff] [blame] | 293 | static irqreturn_t armpmu_dispatch_irq(int irq, void *dev) |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 294 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 295 | struct arm_pmu *armpmu = (struct arm_pmu *) dev; |
Mark Rutland | a9356a0 | 2011-05-04 09:23:15 +0100 | [diff] [blame] | 296 | struct platform_device *plat_device = armpmu->plat_device; |
| 297 | struct arm_pmu_platdata *plat = dev_get_platdata(&plat_device->dev); |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 298 | |
Sudeep KarkadaNagesha | 051f1b1 | 2012-07-31 10:34:25 +0100 | [diff] [blame] | 299 | if (plat && plat->handle_irq) |
| 300 | return plat->handle_irq(irq, dev, armpmu->handle_irq); |
| 301 | else |
| 302 | return armpmu->handle_irq(irq, dev); |
Rabin Vincent | 0e25a5c | 2011-02-08 09:24:36 +0530 | [diff] [blame] | 303 | } |
| 304 | |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 305 | static void |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 306 | armpmu_release_hardware(struct arm_pmu *armpmu) |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 307 | { |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 308 | armpmu->free_irq(armpmu); |
Sudeep KarkadaNagesha | 051f1b1 | 2012-07-31 10:34:25 +0100 | [diff] [blame] | 309 | pm_runtime_put_sync(&armpmu->plat_device->dev); |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 310 | } |
| 311 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 312 | static int |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 313 | armpmu_reserve_hardware(struct arm_pmu *armpmu) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 314 | { |
Sudeep KarkadaNagesha | 051f1b1 | 2012-07-31 10:34:25 +0100 | [diff] [blame] | 315 | int err; |
Mark Rutland | a9356a0 | 2011-05-04 09:23:15 +0100 | [diff] [blame] | 316 | struct platform_device *pmu_device = armpmu->plat_device; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 317 | |
Will Deacon | e5a2132 | 2011-11-22 18:01:46 +0000 | [diff] [blame] | 318 | if (!pmu_device) |
| 319 | return -ENODEV; |
| 320 | |
Jon Hunter | 7be2958 | 2012-05-31 13:05:20 -0500 | [diff] [blame] | 321 | pm_runtime_get_sync(&pmu_device->dev); |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 322 | err = armpmu->request_irq(armpmu, armpmu_dispatch_irq); |
Sudeep KarkadaNagesha | 051f1b1 | 2012-07-31 10:34:25 +0100 | [diff] [blame] | 323 | if (err) { |
| 324 | armpmu_release_hardware(armpmu); |
| 325 | return err; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 326 | } |
| 327 | |
Will Deacon | 0b390e2 | 2011-07-27 15:18:59 +0100 | [diff] [blame] | 328 | return 0; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 329 | } |
| 330 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 331 | static void |
| 332 | hw_perf_event_destroy(struct perf_event *event) |
| 333 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 334 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 335 | atomic_t *active_events = &armpmu->active_events; |
| 336 | struct mutex *pmu_reserve_mutex = &armpmu->reserve_mutex; |
| 337 | |
| 338 | if (atomic_dec_and_mutex_lock(active_events, pmu_reserve_mutex)) { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 339 | armpmu_release_hardware(armpmu); |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 340 | mutex_unlock(pmu_reserve_mutex); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 341 | } |
| 342 | } |
| 343 | |
| 344 | static int |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 345 | event_requires_mode_exclusion(struct perf_event_attr *attr) |
| 346 | { |
| 347 | return attr->exclude_idle || attr->exclude_user || |
| 348 | attr->exclude_kernel || attr->exclude_hv; |
| 349 | } |
| 350 | |
| 351 | static int |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 352 | __hw_perf_event_init(struct perf_event *event) |
| 353 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 354 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 355 | struct hw_perf_event *hwc = &event->hw; |
Mark Rutland | 9dcbf46 | 2013-01-18 16:10:06 +0000 | [diff] [blame] | 356 | int mapping; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 357 | |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 358 | mapping = armpmu->map_event(event); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 359 | |
| 360 | if (mapping < 0) { |
| 361 | pr_debug("event %x:%llx not supported\n", event->attr.type, |
| 362 | event->attr.config); |
| 363 | return mapping; |
| 364 | } |
| 365 | |
| 366 | /* |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 367 | * We don't assign an index until we actually place the event onto |
| 368 | * hardware. Use -1 to signify that we haven't decided where to put it |
| 369 | * yet. For SMP systems, each core has it's own PMU so we can't do any |
| 370 | * clever allocation or constraints checking at this point. |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 371 | */ |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 372 | hwc->idx = -1; |
| 373 | hwc->config_base = 0; |
| 374 | hwc->config = 0; |
| 375 | hwc->event_base = 0; |
| 376 | |
| 377 | /* |
| 378 | * Check whether we need to exclude the counter from certain modes. |
| 379 | */ |
| 380 | if ((!armpmu->set_event_filter || |
| 381 | armpmu->set_event_filter(hwc, &event->attr)) && |
| 382 | event_requires_mode_exclusion(&event->attr)) { |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 383 | pr_debug("ARM performance counters do not support " |
| 384 | "mode exclusion\n"); |
Will Deacon | fdeb8e3 | 2012-07-04 18:15:42 +0100 | [diff] [blame] | 385 | return -EOPNOTSUPP; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | /* |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 389 | * Store the event encoding into the config_base field. |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 390 | */ |
Will Deacon | 05d22fd | 2011-07-19 11:57:30 +0100 | [diff] [blame] | 391 | hwc->config_base |= (unsigned long)mapping; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 392 | |
| 393 | if (!hwc->sample_period) { |
Will Deacon | 5727347 | 2012-03-06 17:33:17 +0100 | [diff] [blame] | 394 | /* |
| 395 | * For non-sampling runs, limit the sample_period to half |
| 396 | * of the counter width. That way, the new counter value |
| 397 | * is far less likely to overtake the previous one unless |
| 398 | * you have some serious IRQ latency issues. |
| 399 | */ |
| 400 | hwc->sample_period = armpmu->max_period >> 1; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 401 | hwc->last_period = hwc->sample_period; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 402 | local64_set(&hwc->period_left, hwc->sample_period); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 403 | } |
| 404 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 405 | if (event->group_leader != event) { |
Chen Gang | e595ede | 2013-02-28 17:51:29 +0100 | [diff] [blame] | 406 | if (validate_group(event) != 0) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 407 | return -EINVAL; |
| 408 | } |
| 409 | |
Mark Rutland | 9dcbf46 | 2013-01-18 16:10:06 +0000 | [diff] [blame] | 410 | return 0; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 411 | } |
| 412 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 413 | static int armpmu_event_init(struct perf_event *event) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 414 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 415 | struct arm_pmu *armpmu = to_arm_pmu(event->pmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 416 | int err = 0; |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 417 | atomic_t *active_events = &armpmu->active_events; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 418 | |
Stephane Eranian | 2481c5f | 2012-02-09 23:20:59 +0100 | [diff] [blame] | 419 | /* does not support taken branch sampling */ |
| 420 | if (has_branch_stack(event)) |
| 421 | return -EOPNOTSUPP; |
| 422 | |
Mark Rutland | e1f431b | 2011-04-28 15:47:10 +0100 | [diff] [blame] | 423 | if (armpmu->map_event(event) == -ENOENT) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 424 | return -ENOENT; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 425 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 426 | event->destroy = hw_perf_event_destroy; |
| 427 | |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 428 | if (!atomic_inc_not_zero(active_events)) { |
| 429 | mutex_lock(&armpmu->reserve_mutex); |
| 430 | if (atomic_read(active_events) == 0) |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 431 | err = armpmu_reserve_hardware(armpmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 432 | |
| 433 | if (!err) |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 434 | atomic_inc(active_events); |
| 435 | mutex_unlock(&armpmu->reserve_mutex); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 436 | } |
| 437 | |
| 438 | if (err) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 439 | return err; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 440 | |
| 441 | err = __hw_perf_event_init(event); |
| 442 | if (err) |
| 443 | hw_perf_event_destroy(event); |
| 444 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 445 | return err; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 446 | } |
| 447 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 448 | static void armpmu_enable(struct pmu *pmu) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 449 | { |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 450 | struct arm_pmu *armpmu = to_arm_pmu(pmu); |
Mark Rutland | 8be3f9a | 2011-05-17 11:20:11 +0100 | [diff] [blame] | 451 | struct pmu_hw_events *hw_events = armpmu->get_hw_events(); |
Mark Rutland | 7325eae | 2011-08-23 11:59:49 +0100 | [diff] [blame] | 452 | int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 453 | |
Will Deacon | f4f3843 | 2011-07-01 14:38:12 +0100 | [diff] [blame] | 454 | if (enabled) |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 455 | armpmu->start(armpmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 456 | } |
| 457 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 458 | static void armpmu_disable(struct pmu *pmu) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 459 | { |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 460 | struct arm_pmu *armpmu = to_arm_pmu(pmu); |
Sudeep KarkadaNagesha | ed6f2a5 | 2012-07-30 12:00:02 +0100 | [diff] [blame] | 461 | armpmu->stop(armpmu); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 462 | } |
| 463 | |
Jon Hunter | 7be2958 | 2012-05-31 13:05:20 -0500 | [diff] [blame] | 464 | #ifdef CONFIG_PM_RUNTIME |
| 465 | static int armpmu_runtime_resume(struct device *dev) |
| 466 | { |
| 467 | struct arm_pmu_platdata *plat = dev_get_platdata(dev); |
| 468 | |
| 469 | if (plat && plat->runtime_resume) |
| 470 | return plat->runtime_resume(dev); |
| 471 | |
| 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | static int armpmu_runtime_suspend(struct device *dev) |
| 476 | { |
| 477 | struct arm_pmu_platdata *plat = dev_get_platdata(dev); |
| 478 | |
| 479 | if (plat && plat->runtime_suspend) |
| 480 | return plat->runtime_suspend(dev); |
| 481 | |
| 482 | return 0; |
| 483 | } |
| 484 | #endif |
| 485 | |
Will Deacon | 6dbc002 | 2012-07-29 12:36:28 +0100 | [diff] [blame] | 486 | const struct dev_pm_ops armpmu_dev_pm_ops = { |
| 487 | SET_RUNTIME_PM_OPS(armpmu_runtime_suspend, armpmu_runtime_resume, NULL) |
| 488 | }; |
| 489 | |
Stephen Boyd | 44d6b1f | 2013-03-05 03:54:06 +0100 | [diff] [blame] | 490 | static void armpmu_init(struct arm_pmu *armpmu) |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 491 | { |
| 492 | atomic_set(&armpmu->active_events, 0); |
| 493 | mutex_init(&armpmu->reserve_mutex); |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 494 | |
| 495 | armpmu->pmu = (struct pmu) { |
| 496 | .pmu_enable = armpmu_enable, |
| 497 | .pmu_disable = armpmu_disable, |
| 498 | .event_init = armpmu_event_init, |
| 499 | .add = armpmu_add, |
| 500 | .del = armpmu_del, |
| 501 | .start = armpmu_start, |
| 502 | .stop = armpmu_stop, |
| 503 | .read = armpmu_read, |
| 504 | }; |
| 505 | } |
| 506 | |
Will Deacon | 0305230 | 2012-09-21 14:23:47 +0100 | [diff] [blame] | 507 | int armpmu_register(struct arm_pmu *armpmu, int type) |
Mark Rutland | 8a16b34 | 2011-04-28 16:27:54 +0100 | [diff] [blame] | 508 | { |
| 509 | armpmu_init(armpmu); |
Jon Hunter | 2ac29a1 | 2012-10-25 21:23:18 +0100 | [diff] [blame] | 510 | pm_runtime_enable(&armpmu->plat_device->dev); |
Will Deacon | 04236f9 | 2012-07-28 17:42:22 +0100 | [diff] [blame] | 511 | pr_info("enabled with %s PMU driver, %d counters available\n", |
| 512 | armpmu->name, armpmu->num_events); |
Will Deacon | 0305230 | 2012-09-21 14:23:47 +0100 | [diff] [blame] | 513 | return perf_pmu_register(&armpmu->pmu, armpmu->name, type); |
Mark Rutland | 03b7898 | 2011-04-27 11:20:11 +0100 | [diff] [blame] | 514 | } |
| 515 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 516 | /* |
| 517 | * Callchain handling code. |
| 518 | */ |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 519 | |
| 520 | /* |
| 521 | * The registers we're interested in are at the end of the variable |
| 522 | * length saved register structure. The fp points at the end of this |
| 523 | * structure so the address of this struct is: |
| 524 | * (struct frame_tail *)(xxx->fp)-1 |
| 525 | * |
| 526 | * This code has been adapted from the ARM OProfile support. |
| 527 | */ |
| 528 | struct frame_tail { |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 529 | struct frame_tail __user *fp; |
| 530 | unsigned long sp; |
| 531 | unsigned long lr; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 532 | } __attribute__((packed)); |
| 533 | |
| 534 | /* |
| 535 | * Get the return address for a single stackframe and return a pointer to the |
| 536 | * next frame tail. |
| 537 | */ |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 538 | static struct frame_tail __user * |
| 539 | user_backtrace(struct frame_tail __user *tail, |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 540 | struct perf_callchain_entry *entry) |
| 541 | { |
| 542 | struct frame_tail buftail; |
| 543 | |
| 544 | /* Also check accessibility of one struct frame_tail beyond */ |
| 545 | if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) |
| 546 | return NULL; |
| 547 | if (__copy_from_user_inatomic(&buftail, tail, sizeof(buftail))) |
| 548 | return NULL; |
| 549 | |
Frederic Weisbecker | 70791ce | 2010-06-29 19:34:05 +0200 | [diff] [blame] | 550 | perf_callchain_store(entry, buftail.lr); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 551 | |
| 552 | /* |
| 553 | * Frame pointers should strictly progress back up the stack |
| 554 | * (towards higher addresses). |
| 555 | */ |
Rabin Vincent | cb06199 | 2011-02-09 11:35:12 +0100 | [diff] [blame] | 556 | if (tail + 1 >= buftail.fp) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 557 | return NULL; |
| 558 | |
| 559 | return buftail.fp - 1; |
| 560 | } |
| 561 | |
Frederic Weisbecker | 56962b4 | 2010-06-30 23:03:51 +0200 | [diff] [blame] | 562 | void |
| 563 | perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 564 | { |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 565 | struct frame_tail __user *tail; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 566 | |
Marc Zyngier | e50c541 | 2012-09-13 16:40:46 +0100 | [diff] [blame] | 567 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { |
| 568 | /* We don't support guest os callchain now */ |
| 569 | return; |
| 570 | } |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 571 | |
Will Deacon | 4d6b7a7 | 2010-11-30 18:15:53 +0100 | [diff] [blame] | 572 | tail = (struct frame_tail __user *)regs->ARM_fp - 1; |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 573 | |
Sonny Rao | 860ad78 | 2011-04-18 22:12:59 +0100 | [diff] [blame] | 574 | while ((entry->nr < PERF_MAX_STACK_DEPTH) && |
| 575 | tail && !((unsigned long)tail & 0x3)) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 576 | tail = user_backtrace(tail, entry); |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Gets called by walk_stackframe() for every stackframe. This will be called |
| 581 | * whist unwinding the stackframe and is like a subroutine return so we use |
| 582 | * the PC. |
| 583 | */ |
| 584 | static int |
| 585 | callchain_trace(struct stackframe *fr, |
| 586 | void *data) |
| 587 | { |
| 588 | struct perf_callchain_entry *entry = data; |
Frederic Weisbecker | 70791ce | 2010-06-29 19:34:05 +0200 | [diff] [blame] | 589 | perf_callchain_store(entry, fr->pc); |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 590 | return 0; |
| 591 | } |
| 592 | |
Frederic Weisbecker | 56962b4 | 2010-06-30 23:03:51 +0200 | [diff] [blame] | 593 | void |
| 594 | perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs) |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 595 | { |
| 596 | struct stackframe fr; |
| 597 | |
Marc Zyngier | e50c541 | 2012-09-13 16:40:46 +0100 | [diff] [blame] | 598 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { |
| 599 | /* We don't support guest os callchain now */ |
| 600 | return; |
| 601 | } |
| 602 | |
Jamie Iles | 1b8873a | 2010-02-02 20:25:44 +0100 | [diff] [blame] | 603 | fr.fp = regs->ARM_fp; |
| 604 | fr.sp = regs->ARM_sp; |
| 605 | fr.lr = regs->ARM_lr; |
| 606 | fr.pc = regs->ARM_pc; |
| 607 | walk_stackframe(&fr, callchain_trace, entry); |
| 608 | } |
Marc Zyngier | e50c541 | 2012-09-13 16:40:46 +0100 | [diff] [blame] | 609 | |
| 610 | unsigned long perf_instruction_pointer(struct pt_regs *regs) |
| 611 | { |
| 612 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) |
| 613 | return perf_guest_cbs->get_guest_ip(); |
| 614 | |
| 615 | return instruction_pointer(regs); |
| 616 | } |
| 617 | |
| 618 | unsigned long perf_misc_flags(struct pt_regs *regs) |
| 619 | { |
| 620 | int misc = 0; |
| 621 | |
| 622 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { |
| 623 | if (perf_guest_cbs->is_user_mode()) |
| 624 | misc |= PERF_RECORD_MISC_GUEST_USER; |
| 625 | else |
| 626 | misc |= PERF_RECORD_MISC_GUEST_KERNEL; |
| 627 | } else { |
| 628 | if (user_mode(regs)) |
| 629 | misc |= PERF_RECORD_MISC_USER; |
| 630 | else |
| 631 | misc |= PERF_RECORD_MISC_KERNEL; |
| 632 | } |
| 633 | |
| 634 | return misc; |
| 635 | } |