Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright(C) 2016 Linaro Limited. All rights reserved. |
| 3 | * Author: Mathieu Poirier <mathieu.poirier@linaro.org> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published by |
| 7 | * the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
Mathieu Poirier | 2e499bb | 2016-05-03 11:33:59 -0600 | [diff] [blame] | 18 | #include <linux/circ_buf.h> |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 19 | #include <linux/coresight.h> |
Mathieu Poirier | 2e499bb | 2016-05-03 11:33:59 -0600 | [diff] [blame] | 20 | #include <linux/perf_event.h> |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 21 | #include <linux/slab.h> |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 22 | #include "coresight-priv.h" |
| 23 | #include "coresight-tmc.h" |
| 24 | |
| 25 | void tmc_etb_enable_hw(struct tmc_drvdata *drvdata) |
| 26 | { |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 27 | CS_UNLOCK(drvdata->base); |
| 28 | |
| 29 | /* Wait for TMCSReady bit to be set */ |
| 30 | tmc_wait_for_tmcready(drvdata); |
| 31 | |
| 32 | writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE); |
| 33 | writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI | |
| 34 | TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT | |
| 35 | TMC_FFCR_TRIGON_TRIGIN, |
| 36 | drvdata->base + TMC_FFCR); |
| 37 | |
| 38 | writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG); |
| 39 | tmc_enable_hw(drvdata); |
| 40 | |
| 41 | CS_LOCK(drvdata->base); |
| 42 | } |
| 43 | |
| 44 | static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata) |
| 45 | { |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 46 | char *bufp; |
| 47 | u32 read_data; |
| 48 | int i; |
| 49 | |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 50 | bufp = drvdata->buf; |
| 51 | while (1) { |
Mathieu Poirier | 4f1ff3d | 2016-05-03 11:33:57 -0600 | [diff] [blame] | 52 | for (i = 0; i < drvdata->memwidth; i++) { |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 53 | read_data = readl_relaxed(drvdata->base + TMC_RRD); |
| 54 | if (read_data == 0xFFFFFFFF) |
| 55 | return; |
| 56 | memcpy(bufp, &read_data, 4); |
| 57 | bufp += 4; |
| 58 | } |
| 59 | } |
| 60 | } |
| 61 | |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 62 | static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 63 | { |
| 64 | CS_UNLOCK(drvdata->base); |
| 65 | |
| 66 | tmc_flush_and_stop(drvdata); |
Mathieu Poirier | a40318f | 2016-05-03 11:33:55 -0600 | [diff] [blame] | 67 | /* |
| 68 | * When operating in sysFS mode the content of the buffer needs to be |
| 69 | * read before the TMC is disabled. |
| 70 | */ |
| 71 | if (local_read(&drvdata->mode) == CS_MODE_SYSFS) |
| 72 | tmc_etb_dump_hw(drvdata); |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 73 | tmc_disable_hw(drvdata); |
| 74 | |
| 75 | CS_LOCK(drvdata->base); |
| 76 | } |
| 77 | |
| 78 | static void tmc_etf_enable_hw(struct tmc_drvdata *drvdata) |
| 79 | { |
| 80 | CS_UNLOCK(drvdata->base); |
| 81 | |
| 82 | /* Wait for TMCSReady bit to be set */ |
| 83 | tmc_wait_for_tmcready(drvdata); |
| 84 | |
| 85 | writel_relaxed(TMC_MODE_HARDWARE_FIFO, drvdata->base + TMC_MODE); |
| 86 | writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI, |
| 87 | drvdata->base + TMC_FFCR); |
| 88 | writel_relaxed(0x0, drvdata->base + TMC_BUFWM); |
| 89 | tmc_enable_hw(drvdata); |
| 90 | |
| 91 | CS_LOCK(drvdata->base); |
| 92 | } |
| 93 | |
| 94 | static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata) |
| 95 | { |
| 96 | CS_UNLOCK(drvdata->base); |
| 97 | |
| 98 | tmc_flush_and_stop(drvdata); |
| 99 | tmc_disable_hw(drvdata); |
| 100 | |
| 101 | CS_LOCK(drvdata->base); |
| 102 | } |
| 103 | |
Mathieu Poirier | b217601 | 2016-05-03 11:33:56 -0600 | [diff] [blame] | 104 | static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev, u32 mode) |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 105 | { |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 106 | int ret = 0; |
| 107 | bool used = false; |
| 108 | char *buf = NULL; |
Mathieu Poirier | f2facc3 | 2016-05-03 11:33:54 -0600 | [diff] [blame] | 109 | long val; |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 110 | unsigned long flags; |
| 111 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 112 | |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 113 | /* This shouldn't be happening */ |
| 114 | if (WARN_ON(mode != CS_MODE_SYSFS)) |
| 115 | return -EINVAL; |
| 116 | |
| 117 | /* |
| 118 | * If we don't have a buffer release the lock and allocate memory. |
| 119 | * Otherwise keep the lock and move along. |
| 120 | */ |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 121 | spin_lock_irqsave(&drvdata->spinlock, flags); |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 122 | if (!drvdata->buf) { |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 123 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 124 | |
| 125 | /* Allocating the memory here while outside of the spinlock */ |
| 126 | buf = kzalloc(drvdata->size, GFP_KERNEL); |
| 127 | if (!buf) |
| 128 | return -ENOMEM; |
| 129 | |
| 130 | /* Let's try again */ |
| 131 | spin_lock_irqsave(&drvdata->spinlock, flags); |
| 132 | } |
| 133 | |
| 134 | if (drvdata->reading) { |
| 135 | ret = -EBUSY; |
| 136 | goto out; |
| 137 | } |
| 138 | |
Mathieu Poirier | f2facc3 | 2016-05-03 11:33:54 -0600 | [diff] [blame] | 139 | val = local_xchg(&drvdata->mode, mode); |
| 140 | /* |
| 141 | * In sysFS mode we can have multiple writers per sink. Since this |
| 142 | * sink is already enabled no memory is needed and the HW need not be |
| 143 | * touched. |
| 144 | */ |
| 145 | if (val == CS_MODE_SYSFS) |
| 146 | goto out; |
| 147 | |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 148 | /* |
| 149 | * If drvdata::buf isn't NULL, memory was allocated for a previous |
| 150 | * trace run but wasn't read. If so simply zero-out the memory. |
| 151 | * Otherwise use the memory allocated above. |
| 152 | * |
| 153 | * The memory is freed when users read the buffer using the |
| 154 | * /dev/xyz.{etf|etb} interface. See tmc_read_unprepare_etf() for |
| 155 | * details. |
| 156 | */ |
| 157 | if (drvdata->buf) { |
| 158 | memset(drvdata->buf, 0, drvdata->size); |
| 159 | } else { |
| 160 | used = true; |
| 161 | drvdata->buf = buf; |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | tmc_etb_enable_hw(drvdata); |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 165 | out: |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 166 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 167 | |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 168 | /* Free memory outside the spinlock if need be */ |
| 169 | if (!used && buf) |
| 170 | kfree(buf); |
| 171 | |
| 172 | if (!ret) |
| 173 | dev_info(drvdata->dev, "TMC-ETB/ETF enabled\n"); |
| 174 | |
| 175 | return ret; |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 176 | } |
| 177 | |
Mathieu Poirier | b217601 | 2016-05-03 11:33:56 -0600 | [diff] [blame] | 178 | static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, u32 mode) |
| 179 | { |
| 180 | int ret = 0; |
| 181 | long val; |
| 182 | unsigned long flags; |
| 183 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 184 | |
| 185 | /* This shouldn't be happening */ |
| 186 | if (WARN_ON(mode != CS_MODE_PERF)) |
| 187 | return -EINVAL; |
| 188 | |
| 189 | spin_lock_irqsave(&drvdata->spinlock, flags); |
| 190 | if (drvdata->reading) { |
| 191 | ret = -EINVAL; |
| 192 | goto out; |
| 193 | } |
| 194 | |
| 195 | val = local_xchg(&drvdata->mode, mode); |
| 196 | /* |
| 197 | * In Perf mode there can be only one writer per sink. There |
| 198 | * is also no need to continue if the ETB/ETR is already operated |
| 199 | * from sysFS. |
| 200 | */ |
| 201 | if (val != CS_MODE_DISABLED) { |
| 202 | ret = -EINVAL; |
| 203 | goto out; |
| 204 | } |
| 205 | |
| 206 | tmc_etb_enable_hw(drvdata); |
| 207 | out: |
| 208 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 209 | |
| 210 | return ret; |
| 211 | } |
| 212 | |
| 213 | static int tmc_enable_etf_sink(struct coresight_device *csdev, u32 mode) |
| 214 | { |
| 215 | switch (mode) { |
| 216 | case CS_MODE_SYSFS: |
| 217 | return tmc_enable_etf_sink_sysfs(csdev, mode); |
| 218 | case CS_MODE_PERF: |
| 219 | return tmc_enable_etf_sink_perf(csdev, mode); |
| 220 | } |
| 221 | |
| 222 | /* We shouldn't be here */ |
| 223 | return -EINVAL; |
| 224 | } |
| 225 | |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 226 | static void tmc_disable_etf_sink(struct coresight_device *csdev) |
| 227 | { |
Mathieu Poirier | f2facc3 | 2016-05-03 11:33:54 -0600 | [diff] [blame] | 228 | long val; |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 229 | unsigned long flags; |
| 230 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 231 | |
| 232 | spin_lock_irqsave(&drvdata->spinlock, flags); |
| 233 | if (drvdata->reading) { |
| 234 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 235 | return; |
| 236 | } |
| 237 | |
Mathieu Poirier | f2facc3 | 2016-05-03 11:33:54 -0600 | [diff] [blame] | 238 | val = local_xchg(&drvdata->mode, CS_MODE_DISABLED); |
| 239 | /* Disable the TMC only if it needs to */ |
| 240 | if (val != CS_MODE_DISABLED) |
| 241 | tmc_etb_disable_hw(drvdata); |
| 242 | |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 243 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 244 | |
| 245 | dev_info(drvdata->dev, "TMC-ETB/ETF disabled\n"); |
| 246 | } |
| 247 | |
| 248 | static int tmc_enable_etf_link(struct coresight_device *csdev, |
| 249 | int inport, int outport) |
| 250 | { |
| 251 | unsigned long flags; |
| 252 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 253 | |
| 254 | spin_lock_irqsave(&drvdata->spinlock, flags); |
| 255 | if (drvdata->reading) { |
| 256 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 257 | return -EBUSY; |
| 258 | } |
| 259 | |
| 260 | tmc_etf_enable_hw(drvdata); |
Mathieu Poirier | f2facc3 | 2016-05-03 11:33:54 -0600 | [diff] [blame] | 261 | local_set(&drvdata->mode, CS_MODE_SYSFS); |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 262 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 263 | |
| 264 | dev_info(drvdata->dev, "TMC-ETF enabled\n"); |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static void tmc_disable_etf_link(struct coresight_device *csdev, |
| 269 | int inport, int outport) |
| 270 | { |
| 271 | unsigned long flags; |
| 272 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 273 | |
| 274 | spin_lock_irqsave(&drvdata->spinlock, flags); |
| 275 | if (drvdata->reading) { |
| 276 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 277 | return; |
| 278 | } |
| 279 | |
| 280 | tmc_etf_disable_hw(drvdata); |
Mathieu Poirier | f2facc3 | 2016-05-03 11:33:54 -0600 | [diff] [blame] | 281 | local_set(&drvdata->mode, CS_MODE_DISABLED); |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 282 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 283 | |
| 284 | dev_info(drvdata->dev, "TMC disabled\n"); |
| 285 | } |
| 286 | |
Mathieu Poirier | 2e499bb | 2016-05-03 11:33:59 -0600 | [diff] [blame] | 287 | static void *tmc_alloc_etf_buffer(struct coresight_device *csdev, int cpu, |
| 288 | void **pages, int nr_pages, bool overwrite) |
| 289 | { |
| 290 | int node; |
| 291 | struct cs_buffers *buf; |
| 292 | |
| 293 | if (cpu == -1) |
| 294 | cpu = smp_processor_id(); |
| 295 | node = cpu_to_node(cpu); |
| 296 | |
| 297 | /* Allocate memory structure for interaction with Perf */ |
| 298 | buf = kzalloc_node(sizeof(struct cs_buffers), GFP_KERNEL, node); |
| 299 | if (!buf) |
| 300 | return NULL; |
| 301 | |
| 302 | buf->snapshot = overwrite; |
| 303 | buf->nr_pages = nr_pages; |
| 304 | buf->data_pages = pages; |
| 305 | |
| 306 | return buf; |
| 307 | } |
| 308 | |
| 309 | static void tmc_free_etf_buffer(void *config) |
| 310 | { |
| 311 | struct cs_buffers *buf = config; |
| 312 | |
| 313 | kfree(buf); |
| 314 | } |
| 315 | |
| 316 | static int tmc_set_etf_buffer(struct coresight_device *csdev, |
| 317 | struct perf_output_handle *handle, |
| 318 | void *sink_config) |
| 319 | { |
| 320 | int ret = 0; |
| 321 | unsigned long head; |
| 322 | struct cs_buffers *buf = sink_config; |
| 323 | |
| 324 | /* wrap head around to the amount of space we have */ |
| 325 | head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1); |
| 326 | |
| 327 | /* find the page to write to */ |
| 328 | buf->cur = head / PAGE_SIZE; |
| 329 | |
| 330 | /* and offset within that page */ |
| 331 | buf->offset = head % PAGE_SIZE; |
| 332 | |
| 333 | local_set(&buf->data_size, 0); |
| 334 | |
| 335 | return ret; |
| 336 | } |
| 337 | |
| 338 | static unsigned long tmc_reset_etf_buffer(struct coresight_device *csdev, |
| 339 | struct perf_output_handle *handle, |
| 340 | void *sink_config, bool *lost) |
| 341 | { |
| 342 | long size = 0; |
| 343 | struct cs_buffers *buf = sink_config; |
| 344 | |
| 345 | if (buf) { |
| 346 | /* |
| 347 | * In snapshot mode ->data_size holds the new address of the |
| 348 | * ring buffer's head. The size itself is the whole address |
| 349 | * range since we want the latest information. |
| 350 | */ |
| 351 | if (buf->snapshot) |
| 352 | handle->head = local_xchg(&buf->data_size, |
| 353 | buf->nr_pages << PAGE_SHIFT); |
| 354 | /* |
| 355 | * Tell the tracer PMU how much we got in this run and if |
| 356 | * something went wrong along the way. Nobody else can use |
| 357 | * this cs_buffers instance until we are done. As such |
| 358 | * resetting parameters here and squaring off with the ring |
| 359 | * buffer API in the tracer PMU is fine. |
| 360 | */ |
| 361 | *lost = !!local_xchg(&buf->lost, 0); |
| 362 | size = local_xchg(&buf->data_size, 0); |
| 363 | } |
| 364 | |
| 365 | return size; |
| 366 | } |
| 367 | |
| 368 | static void tmc_update_etf_buffer(struct coresight_device *csdev, |
| 369 | struct perf_output_handle *handle, |
| 370 | void *sink_config) |
| 371 | { |
| 372 | int i, cur; |
| 373 | u32 *buf_ptr; |
| 374 | u32 read_ptr, write_ptr; |
| 375 | u32 status, to_read; |
| 376 | unsigned long offset; |
| 377 | struct cs_buffers *buf = sink_config; |
| 378 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 379 | |
| 380 | if (!buf) |
| 381 | return; |
| 382 | |
| 383 | /* This shouldn't happen */ |
| 384 | if (WARN_ON_ONCE(local_read(&drvdata->mode) != CS_MODE_PERF)) |
| 385 | return; |
| 386 | |
| 387 | CS_UNLOCK(drvdata->base); |
| 388 | |
| 389 | tmc_flush_and_stop(drvdata); |
| 390 | |
| 391 | read_ptr = readl_relaxed(drvdata->base + TMC_RRP); |
| 392 | write_ptr = readl_relaxed(drvdata->base + TMC_RWP); |
| 393 | |
| 394 | /* |
| 395 | * Get a hold of the status register and see if a wrap around |
| 396 | * has occurred. If so adjust things accordingly. |
| 397 | */ |
| 398 | status = readl_relaxed(drvdata->base + TMC_STS); |
| 399 | if (status & TMC_STS_FULL) { |
| 400 | local_inc(&buf->lost); |
| 401 | to_read = drvdata->size; |
| 402 | } else { |
| 403 | to_read = CIRC_CNT(write_ptr, read_ptr, drvdata->size); |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * The TMC RAM buffer may be bigger than the space available in the |
| 408 | * perf ring buffer (handle->size). If so advance the RRP so that we |
| 409 | * get the latest trace data. |
| 410 | */ |
| 411 | if (to_read > handle->size) { |
| 412 | u32 mask = 0; |
| 413 | |
| 414 | /* |
| 415 | * The value written to RRP must be byte-address aligned to |
| 416 | * the width of the trace memory databus _and_ to a frame |
| 417 | * boundary (16 byte), whichever is the biggest. For example, |
| 418 | * for 32-bit, 64-bit and 128-bit wide trace memory, the four |
| 419 | * LSBs must be 0s. For 256-bit wide trace memory, the five |
| 420 | * LSBs must be 0s. |
| 421 | */ |
| 422 | switch (drvdata->memwidth) { |
| 423 | case TMC_MEM_INTF_WIDTH_32BITS: |
| 424 | case TMC_MEM_INTF_WIDTH_64BITS: |
| 425 | case TMC_MEM_INTF_WIDTH_128BITS: |
| 426 | mask = GENMASK(31, 5); |
| 427 | break; |
| 428 | case TMC_MEM_INTF_WIDTH_256BITS: |
| 429 | mask = GENMASK(31, 6); |
| 430 | break; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * Make sure the new size is aligned in accordance with the |
| 435 | * requirement explained above. |
| 436 | */ |
| 437 | to_read = handle->size & mask; |
| 438 | /* Move the RAM read pointer up */ |
| 439 | read_ptr = (write_ptr + drvdata->size) - to_read; |
| 440 | /* Make sure we are still within our limits */ |
| 441 | if (read_ptr > (drvdata->size - 1)) |
| 442 | read_ptr -= drvdata->size; |
| 443 | /* Tell the HW */ |
| 444 | writel_relaxed(read_ptr, drvdata->base + TMC_RRP); |
| 445 | local_inc(&buf->lost); |
| 446 | } |
| 447 | |
| 448 | cur = buf->cur; |
| 449 | offset = buf->offset; |
| 450 | |
| 451 | /* for every byte to read */ |
| 452 | for (i = 0; i < to_read; i += 4) { |
| 453 | buf_ptr = buf->data_pages[cur] + offset; |
| 454 | *buf_ptr = readl_relaxed(drvdata->base + TMC_RRD); |
| 455 | |
| 456 | offset += 4; |
| 457 | if (offset >= PAGE_SIZE) { |
| 458 | offset = 0; |
| 459 | cur++; |
| 460 | /* wrap around at the end of the buffer */ |
| 461 | cur &= buf->nr_pages - 1; |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * In snapshot mode all we have to do is communicate to |
| 467 | * perf_aux_output_end() the address of the current head. In full |
| 468 | * trace mode the same function expects a size to move rb->aux_head |
| 469 | * forward. |
| 470 | */ |
| 471 | if (buf->snapshot) |
| 472 | local_set(&buf->data_size, (cur * PAGE_SIZE) + offset); |
| 473 | else |
| 474 | local_add(to_read, &buf->data_size); |
| 475 | |
| 476 | CS_LOCK(drvdata->base); |
| 477 | } |
| 478 | |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 479 | static const struct coresight_ops_sink tmc_etf_sink_ops = { |
| 480 | .enable = tmc_enable_etf_sink, |
| 481 | .disable = tmc_disable_etf_sink, |
Mathieu Poirier | 2e499bb | 2016-05-03 11:33:59 -0600 | [diff] [blame] | 482 | .alloc_buffer = tmc_alloc_etf_buffer, |
| 483 | .free_buffer = tmc_free_etf_buffer, |
| 484 | .set_buffer = tmc_set_etf_buffer, |
| 485 | .reset_buffer = tmc_reset_etf_buffer, |
| 486 | .update_buffer = tmc_update_etf_buffer, |
Mathieu Poirier | 6c6ed1e | 2016-05-03 11:33:50 -0600 | [diff] [blame] | 487 | }; |
| 488 | |
| 489 | static const struct coresight_ops_link tmc_etf_link_ops = { |
| 490 | .enable = tmc_enable_etf_link, |
| 491 | .disable = tmc_disable_etf_link, |
| 492 | }; |
| 493 | |
| 494 | const struct coresight_ops tmc_etb_cs_ops = { |
| 495 | .sink_ops = &tmc_etf_sink_ops, |
| 496 | }; |
| 497 | |
| 498 | const struct coresight_ops tmc_etf_cs_ops = { |
| 499 | .sink_ops = &tmc_etf_sink_ops, |
| 500 | .link_ops = &tmc_etf_link_ops, |
| 501 | }; |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 502 | |
| 503 | int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) |
| 504 | { |
Mathieu Poirier | b217601 | 2016-05-03 11:33:56 -0600 | [diff] [blame] | 505 | long val; |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 506 | enum tmc_mode mode; |
| 507 | int ret = 0; |
| 508 | unsigned long flags; |
| 509 | |
| 510 | /* config types are set a boot time and never change */ |
| 511 | if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB && |
| 512 | drvdata->config_type != TMC_CONFIG_TYPE_ETF)) |
| 513 | return -EINVAL; |
| 514 | |
| 515 | spin_lock_irqsave(&drvdata->spinlock, flags); |
| 516 | |
Mathieu Poirier | f74debb | 2016-05-03 11:33:53 -0600 | [diff] [blame] | 517 | if (drvdata->reading) { |
| 518 | ret = -EBUSY; |
| 519 | goto out; |
| 520 | } |
| 521 | |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 522 | /* There is no point in reading a TMC in HW FIFO mode */ |
| 523 | mode = readl_relaxed(drvdata->base + TMC_MODE); |
| 524 | if (mode != TMC_MODE_CIRCULAR_BUFFER) { |
| 525 | ret = -EINVAL; |
| 526 | goto out; |
| 527 | } |
| 528 | |
Mathieu Poirier | b217601 | 2016-05-03 11:33:56 -0600 | [diff] [blame] | 529 | val = local_read(&drvdata->mode); |
| 530 | /* Don't interfere if operated from Perf */ |
| 531 | if (val == CS_MODE_PERF) { |
| 532 | ret = -EINVAL; |
| 533 | goto out; |
| 534 | } |
| 535 | |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 536 | /* If drvdata::buf is NULL the trace data has been read already */ |
| 537 | if (drvdata->buf == NULL) { |
| 538 | ret = -EINVAL; |
| 539 | goto out; |
| 540 | } |
| 541 | |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 542 | /* Disable the TMC if need be */ |
Mathieu Poirier | b217601 | 2016-05-03 11:33:56 -0600 | [diff] [blame] | 543 | if (val == CS_MODE_SYSFS) |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 544 | tmc_etb_disable_hw(drvdata); |
| 545 | |
| 546 | drvdata->reading = true; |
| 547 | out: |
| 548 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 549 | |
| 550 | return ret; |
| 551 | } |
| 552 | |
| 553 | int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata) |
| 554 | { |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 555 | char *buf = NULL; |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 556 | enum tmc_mode mode; |
| 557 | unsigned long flags; |
| 558 | |
| 559 | /* config types are set a boot time and never change */ |
| 560 | if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB && |
| 561 | drvdata->config_type != TMC_CONFIG_TYPE_ETF)) |
| 562 | return -EINVAL; |
| 563 | |
| 564 | spin_lock_irqsave(&drvdata->spinlock, flags); |
| 565 | |
| 566 | /* There is no point in reading a TMC in HW FIFO mode */ |
| 567 | mode = readl_relaxed(drvdata->base + TMC_MODE); |
| 568 | if (mode != TMC_MODE_CIRCULAR_BUFFER) { |
| 569 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 570 | return -EINVAL; |
| 571 | } |
| 572 | |
| 573 | /* Re-enable the TMC if need be */ |
Mathieu Poirier | f2facc3 | 2016-05-03 11:33:54 -0600 | [diff] [blame] | 574 | if (local_read(&drvdata->mode) == CS_MODE_SYSFS) { |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 575 | /* |
| 576 | * The trace run will continue with the same allocated trace |
| 577 | * buffer. As such zero-out the buffer so that we don't end |
| 578 | * up with stale data. |
| 579 | * |
| 580 | * Since the tracer is still enabled drvdata::buf |
| 581 | * can't be NULL. |
| 582 | */ |
| 583 | memset(drvdata->buf, 0, drvdata->size); |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 584 | tmc_etb_enable_hw(drvdata); |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 585 | } else { |
| 586 | /* |
| 587 | * The ETB/ETF is not tracing and the buffer was just read. |
| 588 | * As such prepare to free the trace buffer. |
| 589 | */ |
| 590 | buf = drvdata->buf; |
| 591 | drvdata->buf = NULL; |
| 592 | } |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 593 | |
| 594 | drvdata->reading = false; |
| 595 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
| 596 | |
Mathieu Poirier | de54619 | 2016-05-03 11:33:52 -0600 | [diff] [blame] | 597 | /* |
| 598 | * Free allocated memory outside of the spinlock. There is no need |
| 599 | * to assert the validity of 'buf' since calling kfree(NULL) is safe. |
| 600 | */ |
| 601 | kfree(buf); |
| 602 | |
Mathieu Poirier | 4525412 | 2016-05-03 11:33:51 -0600 | [diff] [blame] | 603 | return 0; |
| 604 | } |