Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Intel(R) Trace Hub driver core |
| 3 | * |
| 4 | * Copyright (C) 2014-2015 Intel Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | */ |
| 15 | |
| 16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 17 | |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/sysfs.h> |
| 22 | #include <linux/kdev_t.h> |
| 23 | #include <linux/debugfs.h> |
| 24 | #include <linux/idr.h> |
| 25 | #include <linux/pci.h> |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 26 | #include <linux/pm_runtime.h> |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 27 | #include <linux/dma-mapping.h> |
| 28 | |
| 29 | #include "intel_th.h" |
| 30 | #include "debug.h" |
| 31 | |
| 32 | static DEFINE_IDA(intel_th_ida); |
| 33 | |
| 34 | static int intel_th_match(struct device *dev, struct device_driver *driver) |
| 35 | { |
| 36 | struct intel_th_driver *thdrv = to_intel_th_driver(driver); |
| 37 | struct intel_th_device *thdev = to_intel_th_device(dev); |
| 38 | |
| 39 | if (thdev->type == INTEL_TH_SWITCH && |
| 40 | (!thdrv->enable || !thdrv->disable)) |
| 41 | return 0; |
| 42 | |
| 43 | return !strcmp(thdev->name, driver->name); |
| 44 | } |
| 45 | |
| 46 | static int intel_th_child_remove(struct device *dev, void *data) |
| 47 | { |
| 48 | device_release_driver(dev); |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | static int intel_th_probe(struct device *dev) |
| 54 | { |
| 55 | struct intel_th_driver *thdrv = to_intel_th_driver(dev->driver); |
| 56 | struct intel_th_device *thdev = to_intel_th_device(dev); |
| 57 | struct intel_th_driver *hubdrv; |
| 58 | struct intel_th_device *hub = NULL; |
| 59 | int ret; |
| 60 | |
| 61 | if (thdev->type == INTEL_TH_SWITCH) |
| 62 | hub = thdev; |
| 63 | else if (dev->parent) |
| 64 | hub = to_intel_th_device(dev->parent); |
| 65 | |
| 66 | if (!hub || !hub->dev.driver) |
| 67 | return -EPROBE_DEFER; |
| 68 | |
| 69 | hubdrv = to_intel_th_driver(hub->dev.driver); |
| 70 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 71 | pm_runtime_set_active(dev); |
| 72 | pm_runtime_no_callbacks(dev); |
| 73 | pm_runtime_enable(dev); |
| 74 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 75 | ret = thdrv->probe(to_intel_th_device(dev)); |
| 76 | if (ret) |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 77 | goto out_pm; |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 78 | |
Alexander Shishkin | b5edbf1 | 2016-03-04 19:42:48 +0200 | [diff] [blame] | 79 | if (thdrv->attr_group) { |
| 80 | ret = sysfs_create_group(&thdev->dev.kobj, thdrv->attr_group); |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 81 | if (ret) |
| 82 | goto out; |
Alexander Shishkin | b5edbf1 | 2016-03-04 19:42:48 +0200 | [diff] [blame] | 83 | } |
| 84 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 85 | if (thdev->type == INTEL_TH_OUTPUT && |
| 86 | !intel_th_output_assigned(thdev)) |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 87 | /* does not talk to hardware */ |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 88 | ret = hubdrv->assign(hub, thdev); |
| 89 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 90 | out: |
| 91 | if (ret) |
| 92 | thdrv->remove(thdev); |
| 93 | |
| 94 | out_pm: |
| 95 | if (ret) |
| 96 | pm_runtime_disable(dev); |
| 97 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | static int intel_th_remove(struct device *dev) |
| 102 | { |
| 103 | struct intel_th_driver *thdrv = to_intel_th_driver(dev->driver); |
| 104 | struct intel_th_device *thdev = to_intel_th_device(dev); |
| 105 | struct intel_th_device *hub = to_intel_th_device(dev->parent); |
| 106 | int err; |
| 107 | |
| 108 | if (thdev->type == INTEL_TH_SWITCH) { |
| 109 | err = device_for_each_child(dev, thdev, intel_th_child_remove); |
| 110 | if (err) |
| 111 | return err; |
| 112 | } |
| 113 | |
Alexander Shishkin | b5edbf1 | 2016-03-04 19:42:48 +0200 | [diff] [blame] | 114 | if (thdrv->attr_group) |
| 115 | sysfs_remove_group(&thdev->dev.kobj, thdrv->attr_group); |
| 116 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 117 | pm_runtime_get_sync(dev); |
| 118 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 119 | thdrv->remove(thdev); |
| 120 | |
| 121 | if (intel_th_output_assigned(thdev)) { |
| 122 | struct intel_th_driver *hubdrv = |
| 123 | to_intel_th_driver(dev->parent->driver); |
| 124 | |
| 125 | if (hub->dev.driver) |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 126 | /* does not talk to hardware */ |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 127 | hubdrv->unassign(hub, thdev); |
| 128 | } |
| 129 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 130 | pm_runtime_disable(dev); |
| 131 | pm_runtime_set_active(dev); |
| 132 | pm_runtime_enable(dev); |
| 133 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static struct bus_type intel_th_bus = { |
| 138 | .name = "intel_th", |
| 139 | .dev_attrs = NULL, |
| 140 | .match = intel_th_match, |
| 141 | .probe = intel_th_probe, |
| 142 | .remove = intel_th_remove, |
| 143 | }; |
| 144 | |
| 145 | static void intel_th_device_free(struct intel_th_device *thdev); |
| 146 | |
| 147 | static void intel_th_device_release(struct device *dev) |
| 148 | { |
| 149 | intel_th_device_free(to_intel_th_device(dev)); |
| 150 | } |
| 151 | |
| 152 | static struct device_type intel_th_source_device_type = { |
| 153 | .name = "intel_th_source_device", |
| 154 | .release = intel_th_device_release, |
| 155 | }; |
| 156 | |
Alexander Shishkin | 14136e3 | 2016-02-15 19:12:00 +0200 | [diff] [blame] | 157 | static struct intel_th *to_intel_th(struct intel_th_device *thdev) |
| 158 | { |
| 159 | /* |
| 160 | * subdevice tree is flat: if this one is not a switch, its |
| 161 | * parent must be |
| 162 | */ |
| 163 | if (thdev->type != INTEL_TH_SWITCH) |
| 164 | thdev = to_intel_th_hub(thdev); |
| 165 | |
| 166 | if (WARN_ON_ONCE(!thdev || thdev->type != INTEL_TH_SWITCH)) |
| 167 | return NULL; |
| 168 | |
| 169 | return dev_get_drvdata(thdev->dev.parent); |
| 170 | } |
| 171 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 172 | static char *intel_th_output_devnode(struct device *dev, umode_t *mode, |
| 173 | kuid_t *uid, kgid_t *gid) |
| 174 | { |
| 175 | struct intel_th_device *thdev = to_intel_th_device(dev); |
Alexander Shishkin | 14136e3 | 2016-02-15 19:12:00 +0200 | [diff] [blame] | 176 | struct intel_th *th = to_intel_th(thdev); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 177 | char *node; |
| 178 | |
| 179 | if (thdev->id >= 0) |
Alexander Shishkin | 14136e3 | 2016-02-15 19:12:00 +0200 | [diff] [blame] | 180 | node = kasprintf(GFP_KERNEL, "intel_th%d/%s%d", th->id, |
| 181 | thdev->name, thdev->id); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 182 | else |
Alexander Shishkin | 14136e3 | 2016-02-15 19:12:00 +0200 | [diff] [blame] | 183 | node = kasprintf(GFP_KERNEL, "intel_th%d/%s", th->id, |
| 184 | thdev->name); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 185 | |
| 186 | return node; |
| 187 | } |
| 188 | |
| 189 | static ssize_t port_show(struct device *dev, struct device_attribute *attr, |
| 190 | char *buf) |
| 191 | { |
| 192 | struct intel_th_device *thdev = to_intel_th_device(dev); |
| 193 | |
| 194 | if (thdev->output.port >= 0) |
| 195 | return scnprintf(buf, PAGE_SIZE, "%u\n", thdev->output.port); |
| 196 | |
| 197 | return scnprintf(buf, PAGE_SIZE, "unassigned\n"); |
| 198 | } |
| 199 | |
| 200 | static DEVICE_ATTR_RO(port); |
| 201 | |
| 202 | static int intel_th_output_activate(struct intel_th_device *thdev) |
| 203 | { |
Alexander Shishkin | f18a953 | 2016-03-07 17:04:45 +0200 | [diff] [blame] | 204 | struct intel_th_driver *thdrv = |
| 205 | to_intel_th_driver_or_null(thdev->dev.driver); |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 206 | int ret = 0; |
Alexander Shishkin | f18a953 | 2016-03-07 17:04:45 +0200 | [diff] [blame] | 207 | |
| 208 | if (!thdrv) |
| 209 | return -ENODEV; |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 210 | |
Alexander Shishkin | e2ea295 | 2016-04-08 17:35:04 +0300 | [diff] [blame] | 211 | if (!try_module_get(thdrv->driver.owner)) |
| 212 | return -ENODEV; |
| 213 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 214 | pm_runtime_get_sync(&thdev->dev); |
| 215 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 216 | if (thdrv->activate) |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 217 | ret = thdrv->activate(thdev); |
| 218 | else |
| 219 | intel_th_trace_enable(thdev); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 220 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 221 | if (ret) |
| 222 | pm_runtime_put(&thdev->dev); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 223 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 224 | return ret; |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | static void intel_th_output_deactivate(struct intel_th_device *thdev) |
| 228 | { |
Alexander Shishkin | f18a953 | 2016-03-07 17:04:45 +0200 | [diff] [blame] | 229 | struct intel_th_driver *thdrv = |
| 230 | to_intel_th_driver_or_null(thdev->dev.driver); |
| 231 | |
| 232 | if (!thdrv) |
| 233 | return; |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 234 | |
| 235 | if (thdrv->deactivate) |
| 236 | thdrv->deactivate(thdev); |
| 237 | else |
| 238 | intel_th_trace_disable(thdev); |
Alexander Shishkin | e2ea295 | 2016-04-08 17:35:04 +0300 | [diff] [blame] | 239 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 240 | pm_runtime_put(&thdev->dev); |
Alexander Shishkin | e2ea295 | 2016-04-08 17:35:04 +0300 | [diff] [blame] | 241 | module_put(thdrv->driver.owner); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | static ssize_t active_show(struct device *dev, struct device_attribute *attr, |
| 245 | char *buf) |
| 246 | { |
| 247 | struct intel_th_device *thdev = to_intel_th_device(dev); |
| 248 | |
| 249 | return scnprintf(buf, PAGE_SIZE, "%d\n", thdev->output.active); |
| 250 | } |
| 251 | |
| 252 | static ssize_t active_store(struct device *dev, struct device_attribute *attr, |
| 253 | const char *buf, size_t size) |
| 254 | { |
| 255 | struct intel_th_device *thdev = to_intel_th_device(dev); |
| 256 | unsigned long val; |
| 257 | int ret; |
| 258 | |
| 259 | ret = kstrtoul(buf, 10, &val); |
| 260 | if (ret) |
| 261 | return ret; |
| 262 | |
| 263 | if (!!val != thdev->output.active) { |
| 264 | if (val) |
| 265 | ret = intel_th_output_activate(thdev); |
| 266 | else |
| 267 | intel_th_output_deactivate(thdev); |
| 268 | } |
| 269 | |
| 270 | return ret ? ret : size; |
| 271 | } |
| 272 | |
| 273 | static DEVICE_ATTR_RW(active); |
| 274 | |
| 275 | static struct attribute *intel_th_output_attrs[] = { |
| 276 | &dev_attr_port.attr, |
| 277 | &dev_attr_active.attr, |
| 278 | NULL, |
| 279 | }; |
| 280 | |
| 281 | ATTRIBUTE_GROUPS(intel_th_output); |
| 282 | |
| 283 | static struct device_type intel_th_output_device_type = { |
| 284 | .name = "intel_th_output_device", |
| 285 | .groups = intel_th_output_groups, |
| 286 | .release = intel_th_device_release, |
| 287 | .devnode = intel_th_output_devnode, |
| 288 | }; |
| 289 | |
| 290 | static struct device_type intel_th_switch_device_type = { |
| 291 | .name = "intel_th_switch_device", |
| 292 | .release = intel_th_device_release, |
| 293 | }; |
| 294 | |
| 295 | static struct device_type *intel_th_device_type[] = { |
| 296 | [INTEL_TH_SOURCE] = &intel_th_source_device_type, |
| 297 | [INTEL_TH_OUTPUT] = &intel_th_output_device_type, |
| 298 | [INTEL_TH_SWITCH] = &intel_th_switch_device_type, |
| 299 | }; |
| 300 | |
| 301 | int intel_th_driver_register(struct intel_th_driver *thdrv) |
| 302 | { |
| 303 | if (!thdrv->probe || !thdrv->remove) |
| 304 | return -EINVAL; |
| 305 | |
| 306 | thdrv->driver.bus = &intel_th_bus; |
| 307 | |
| 308 | return driver_register(&thdrv->driver); |
| 309 | } |
| 310 | EXPORT_SYMBOL_GPL(intel_th_driver_register); |
| 311 | |
| 312 | void intel_th_driver_unregister(struct intel_th_driver *thdrv) |
| 313 | { |
| 314 | driver_unregister(&thdrv->driver); |
| 315 | } |
| 316 | EXPORT_SYMBOL_GPL(intel_th_driver_unregister); |
| 317 | |
| 318 | static struct intel_th_device * |
| 319 | intel_th_device_alloc(struct intel_th *th, unsigned int type, const char *name, |
| 320 | int id) |
| 321 | { |
| 322 | struct device *parent; |
| 323 | struct intel_th_device *thdev; |
| 324 | |
| 325 | if (type == INTEL_TH_SWITCH) |
| 326 | parent = th->dev; |
| 327 | else |
| 328 | parent = &th->hub->dev; |
| 329 | |
| 330 | thdev = kzalloc(sizeof(*thdev) + strlen(name) + 1, GFP_KERNEL); |
| 331 | if (!thdev) |
| 332 | return NULL; |
| 333 | |
| 334 | thdev->id = id; |
| 335 | thdev->type = type; |
| 336 | |
| 337 | strcpy(thdev->name, name); |
| 338 | device_initialize(&thdev->dev); |
| 339 | thdev->dev.bus = &intel_th_bus; |
| 340 | thdev->dev.type = intel_th_device_type[type]; |
| 341 | thdev->dev.parent = parent; |
| 342 | thdev->dev.dma_mask = parent->dma_mask; |
| 343 | thdev->dev.dma_parms = parent->dma_parms; |
| 344 | dma_set_coherent_mask(&thdev->dev, parent->coherent_dma_mask); |
| 345 | if (id >= 0) |
| 346 | dev_set_name(&thdev->dev, "%d-%s%d", th->id, name, id); |
| 347 | else |
| 348 | dev_set_name(&thdev->dev, "%d-%s", th->id, name); |
| 349 | |
| 350 | return thdev; |
| 351 | } |
| 352 | |
| 353 | static int intel_th_device_add_resources(struct intel_th_device *thdev, |
| 354 | struct resource *res, int nres) |
| 355 | { |
| 356 | struct resource *r; |
| 357 | |
| 358 | r = kmemdup(res, sizeof(*res) * nres, GFP_KERNEL); |
| 359 | if (!r) |
| 360 | return -ENOMEM; |
| 361 | |
| 362 | thdev->resource = r; |
| 363 | thdev->num_resources = nres; |
| 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static void intel_th_device_remove(struct intel_th_device *thdev) |
| 369 | { |
| 370 | device_del(&thdev->dev); |
| 371 | put_device(&thdev->dev); |
| 372 | } |
| 373 | |
| 374 | static void intel_th_device_free(struct intel_th_device *thdev) |
| 375 | { |
| 376 | kfree(thdev->resource); |
| 377 | kfree(thdev); |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Intel(R) Trace Hub subdevices |
| 382 | */ |
| 383 | static struct intel_th_subdevice { |
| 384 | const char *name; |
| 385 | struct resource res[3]; |
| 386 | unsigned nres; |
| 387 | unsigned type; |
| 388 | unsigned otype; |
Alexander Shishkin | 4d02cef | 2016-02-15 19:11:55 +0200 | [diff] [blame] | 389 | unsigned scrpd; |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 390 | int id; |
| 391 | } intel_th_subdevices[TH_SUBDEVICE_MAX] = { |
| 392 | { |
| 393 | .nres = 1, |
| 394 | .res = { |
| 395 | { |
| 396 | .start = REG_GTH_OFFSET, |
| 397 | .end = REG_GTH_OFFSET + REG_GTH_LENGTH - 1, |
| 398 | .flags = IORESOURCE_MEM, |
| 399 | }, |
| 400 | }, |
| 401 | .name = "gth", |
| 402 | .type = INTEL_TH_SWITCH, |
| 403 | .id = -1, |
| 404 | }, |
| 405 | { |
| 406 | .nres = 2, |
| 407 | .res = { |
| 408 | { |
| 409 | .start = REG_MSU_OFFSET, |
| 410 | .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1, |
| 411 | .flags = IORESOURCE_MEM, |
| 412 | }, |
| 413 | { |
| 414 | .start = BUF_MSU_OFFSET, |
| 415 | .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1, |
| 416 | .flags = IORESOURCE_MEM, |
| 417 | }, |
| 418 | }, |
| 419 | .name = "msc", |
| 420 | .id = 0, |
| 421 | .type = INTEL_TH_OUTPUT, |
| 422 | .otype = GTH_MSU, |
Alexander Shishkin | 4d02cef | 2016-02-15 19:11:55 +0200 | [diff] [blame] | 423 | .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC0_IS_ENABLED, |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 424 | }, |
| 425 | { |
| 426 | .nres = 2, |
| 427 | .res = { |
| 428 | { |
| 429 | .start = REG_MSU_OFFSET, |
| 430 | .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1, |
| 431 | .flags = IORESOURCE_MEM, |
| 432 | }, |
| 433 | { |
| 434 | .start = BUF_MSU_OFFSET, |
| 435 | .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1, |
| 436 | .flags = IORESOURCE_MEM, |
| 437 | }, |
| 438 | }, |
| 439 | .name = "msc", |
| 440 | .id = 1, |
| 441 | .type = INTEL_TH_OUTPUT, |
| 442 | .otype = GTH_MSU, |
Alexander Shishkin | 4d02cef | 2016-02-15 19:11:55 +0200 | [diff] [blame] | 443 | .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC1_IS_ENABLED, |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 444 | }, |
| 445 | { |
| 446 | .nres = 2, |
| 447 | .res = { |
| 448 | { |
| 449 | .start = REG_STH_OFFSET, |
| 450 | .end = REG_STH_OFFSET + REG_STH_LENGTH - 1, |
| 451 | .flags = IORESOURCE_MEM, |
| 452 | }, |
| 453 | { |
| 454 | .start = TH_MMIO_SW, |
| 455 | .end = 0, |
| 456 | .flags = IORESOURCE_MEM, |
| 457 | }, |
| 458 | }, |
| 459 | .id = -1, |
| 460 | .name = "sth", |
| 461 | .type = INTEL_TH_SOURCE, |
| 462 | }, |
| 463 | { |
| 464 | .nres = 1, |
| 465 | .res = { |
| 466 | { |
| 467 | .start = REG_PTI_OFFSET, |
| 468 | .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1, |
| 469 | .flags = IORESOURCE_MEM, |
| 470 | }, |
| 471 | }, |
| 472 | .id = -1, |
| 473 | .name = "pti", |
| 474 | .type = INTEL_TH_OUTPUT, |
| 475 | .otype = GTH_PTI, |
Alexander Shishkin | 4d02cef | 2016-02-15 19:11:55 +0200 | [diff] [blame] | 476 | .scrpd = SCRPD_PTI_IS_PRIM_DEST, |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 477 | }, |
| 478 | { |
| 479 | .nres = 1, |
| 480 | .res = { |
| 481 | { |
| 482 | .start = REG_DCIH_OFFSET, |
| 483 | .end = REG_DCIH_OFFSET + REG_DCIH_LENGTH - 1, |
| 484 | .flags = IORESOURCE_MEM, |
| 485 | }, |
| 486 | }, |
| 487 | .id = -1, |
| 488 | .name = "dcih", |
| 489 | .type = INTEL_TH_OUTPUT, |
| 490 | }, |
| 491 | }; |
| 492 | |
Alexander Shishkin | a36aa80 | 2016-06-30 11:51:44 +0300 | [diff] [blame] | 493 | #ifdef CONFIG_MODULES |
| 494 | static void __intel_th_request_hub_module(struct work_struct *work) |
| 495 | { |
| 496 | struct intel_th *th = container_of(work, struct intel_th, |
| 497 | request_module_work); |
| 498 | |
| 499 | request_module("intel_th_%s", th->hub->name); |
| 500 | } |
| 501 | |
| 502 | static int intel_th_request_hub_module(struct intel_th *th) |
| 503 | { |
| 504 | INIT_WORK(&th->request_module_work, __intel_th_request_hub_module); |
| 505 | schedule_work(&th->request_module_work); |
| 506 | |
| 507 | return 0; |
| 508 | } |
| 509 | |
| 510 | static void intel_th_request_hub_module_flush(struct intel_th *th) |
| 511 | { |
| 512 | flush_work(&th->request_module_work); |
| 513 | } |
| 514 | #else |
| 515 | static inline int intel_th_request_hub_module(struct intel_th *th) |
| 516 | { |
| 517 | return -EINVAL; |
| 518 | } |
| 519 | |
| 520 | static inline void intel_th_request_hub_module_flush(struct intel_th *th) |
| 521 | { |
| 522 | } |
| 523 | #endif /* CONFIG_MODULES */ |
| 524 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 525 | static int intel_th_populate(struct intel_th *th, struct resource *devres, |
| 526 | unsigned int ndevres, int irq) |
| 527 | { |
| 528 | struct resource res[3]; |
| 529 | unsigned int req = 0; |
| 530 | int i, err; |
| 531 | |
| 532 | /* create devices for each intel_th_subdevice */ |
| 533 | for (i = 0; i < ARRAY_SIZE(intel_th_subdevices); i++) { |
| 534 | struct intel_th_subdevice *subdev = &intel_th_subdevices[i]; |
| 535 | struct intel_th_device *thdev; |
| 536 | int r; |
| 537 | |
| 538 | thdev = intel_th_device_alloc(th, subdev->type, subdev->name, |
| 539 | subdev->id); |
| 540 | if (!thdev) { |
| 541 | err = -ENOMEM; |
| 542 | goto kill_subdevs; |
| 543 | } |
| 544 | |
| 545 | memcpy(res, subdev->res, |
| 546 | sizeof(struct resource) * subdev->nres); |
| 547 | |
| 548 | for (r = 0; r < subdev->nres; r++) { |
| 549 | int bar = TH_MMIO_CONFIG; |
| 550 | |
| 551 | /* |
| 552 | * Take .end == 0 to mean 'take the whole bar', |
| 553 | * .start then tells us which bar it is. Default to |
| 554 | * TH_MMIO_CONFIG. |
| 555 | */ |
| 556 | if (!res[r].end && res[r].flags == IORESOURCE_MEM) { |
| 557 | bar = res[r].start; |
| 558 | res[r].start = 0; |
| 559 | res[r].end = resource_size(&devres[bar]) - 1; |
| 560 | } |
| 561 | |
| 562 | if (res[r].flags & IORESOURCE_MEM) { |
| 563 | res[r].start += devres[bar].start; |
| 564 | res[r].end += devres[bar].start; |
| 565 | |
| 566 | dev_dbg(th->dev, "%s:%d @ %pR\n", |
| 567 | subdev->name, r, &res[r]); |
| 568 | } else if (res[r].flags & IORESOURCE_IRQ) { |
| 569 | res[r].start = irq; |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | err = intel_th_device_add_resources(thdev, res, subdev->nres); |
| 574 | if (err) { |
| 575 | put_device(&thdev->dev); |
| 576 | goto kill_subdevs; |
| 577 | } |
| 578 | |
| 579 | if (subdev->type == INTEL_TH_OUTPUT) { |
| 580 | thdev->dev.devt = MKDEV(th->major, i); |
| 581 | thdev->output.type = subdev->otype; |
| 582 | thdev->output.port = -1; |
Alexander Shishkin | 4d02cef | 2016-02-15 19:11:55 +0200 | [diff] [blame] | 583 | thdev->output.scratchpad = subdev->scrpd; |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | err = device_add(&thdev->dev); |
| 587 | if (err) { |
| 588 | put_device(&thdev->dev); |
| 589 | goto kill_subdevs; |
| 590 | } |
| 591 | |
| 592 | /* need switch driver to be loaded to enumerate the rest */ |
| 593 | if (subdev->type == INTEL_TH_SWITCH && !req) { |
| 594 | th->hub = thdev; |
Alexander Shishkin | a36aa80 | 2016-06-30 11:51:44 +0300 | [diff] [blame] | 595 | err = intel_th_request_hub_module(th); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 596 | if (!err) |
| 597 | req++; |
| 598 | } |
| 599 | |
| 600 | th->thdev[i] = thdev; |
| 601 | } |
| 602 | |
| 603 | return 0; |
| 604 | |
| 605 | kill_subdevs: |
| 606 | for (i-- ; i >= 0; i--) |
| 607 | intel_th_device_remove(th->thdev[i]); |
| 608 | |
| 609 | return err; |
| 610 | } |
| 611 | |
| 612 | static int match_devt(struct device *dev, void *data) |
| 613 | { |
| 614 | dev_t devt = (dev_t)(unsigned long)data; |
| 615 | |
| 616 | return dev->devt == devt; |
| 617 | } |
| 618 | |
| 619 | static int intel_th_output_open(struct inode *inode, struct file *file) |
| 620 | { |
| 621 | const struct file_operations *fops; |
| 622 | struct intel_th_driver *thdrv; |
| 623 | struct device *dev; |
| 624 | int err; |
| 625 | |
| 626 | dev = bus_find_device(&intel_th_bus, NULL, |
| 627 | (void *)(unsigned long)inode->i_rdev, |
| 628 | match_devt); |
| 629 | if (!dev || !dev->driver) |
| 630 | return -ENODEV; |
| 631 | |
| 632 | thdrv = to_intel_th_driver(dev->driver); |
| 633 | fops = fops_get(thdrv->fops); |
| 634 | if (!fops) |
| 635 | return -ENODEV; |
| 636 | |
| 637 | replace_fops(file, fops); |
| 638 | |
| 639 | file->private_data = to_intel_th_device(dev); |
| 640 | |
| 641 | if (file->f_op->open) { |
| 642 | err = file->f_op->open(inode, file); |
| 643 | return err; |
| 644 | } |
| 645 | |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static const struct file_operations intel_th_output_fops = { |
| 650 | .open = intel_th_output_open, |
| 651 | .llseek = noop_llseek, |
| 652 | }; |
| 653 | |
| 654 | /** |
| 655 | * intel_th_alloc() - allocate a new Intel TH device and its subdevices |
| 656 | * @dev: parent device |
| 657 | * @devres: parent's resources |
| 658 | * @ndevres: number of resources |
| 659 | * @irq: irq number |
| 660 | */ |
| 661 | struct intel_th * |
| 662 | intel_th_alloc(struct device *dev, struct resource *devres, |
| 663 | unsigned int ndevres, int irq) |
| 664 | { |
| 665 | struct intel_th *th; |
| 666 | int err; |
| 667 | |
| 668 | th = kzalloc(sizeof(*th), GFP_KERNEL); |
| 669 | if (!th) |
| 670 | return ERR_PTR(-ENOMEM); |
| 671 | |
| 672 | th->id = ida_simple_get(&intel_th_ida, 0, 0, GFP_KERNEL); |
| 673 | if (th->id < 0) { |
| 674 | err = th->id; |
| 675 | goto err_alloc; |
| 676 | } |
| 677 | |
| 678 | th->major = __register_chrdev(0, 0, TH_POSSIBLE_OUTPUTS, |
| 679 | "intel_th/output", &intel_th_output_fops); |
| 680 | if (th->major < 0) { |
| 681 | err = th->major; |
| 682 | goto err_ida; |
| 683 | } |
| 684 | th->dev = dev; |
| 685 | |
Alexander Shishkin | d7b1787 | 2016-02-15 19:11:59 +0200 | [diff] [blame] | 686 | dev_set_drvdata(dev, th); |
| 687 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 688 | pm_runtime_no_callbacks(dev); |
| 689 | pm_runtime_put(dev); |
| 690 | pm_runtime_allow(dev); |
| 691 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 692 | err = intel_th_populate(th, devres, ndevres, irq); |
| 693 | if (err) |
| 694 | goto err_chrdev; |
| 695 | |
| 696 | return th; |
| 697 | |
| 698 | err_chrdev: |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 699 | pm_runtime_forbid(dev); |
| 700 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 701 | __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS, |
| 702 | "intel_th/output"); |
| 703 | |
| 704 | err_ida: |
| 705 | ida_simple_remove(&intel_th_ida, th->id); |
| 706 | |
| 707 | err_alloc: |
| 708 | kfree(th); |
| 709 | |
| 710 | return ERR_PTR(err); |
| 711 | } |
| 712 | EXPORT_SYMBOL_GPL(intel_th_alloc); |
| 713 | |
| 714 | void intel_th_free(struct intel_th *th) |
| 715 | { |
| 716 | int i; |
| 717 | |
Alexander Shishkin | a36aa80 | 2016-06-30 11:51:44 +0300 | [diff] [blame] | 718 | intel_th_request_hub_module_flush(th); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 719 | for (i = 0; i < TH_SUBDEVICE_MAX; i++) |
| 720 | if (th->thdev[i] != th->hub) |
| 721 | intel_th_device_remove(th->thdev[i]); |
| 722 | |
| 723 | intel_th_device_remove(th->hub); |
| 724 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 725 | pm_runtime_get_sync(th->dev); |
| 726 | pm_runtime_forbid(th->dev); |
| 727 | |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 728 | __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS, |
| 729 | "intel_th/output"); |
| 730 | |
| 731 | ida_simple_remove(&intel_th_ida, th->id); |
| 732 | |
| 733 | kfree(th); |
| 734 | } |
| 735 | EXPORT_SYMBOL_GPL(intel_th_free); |
| 736 | |
| 737 | /** |
| 738 | * intel_th_trace_enable() - enable tracing for an output device |
| 739 | * @thdev: output device that requests tracing be enabled |
| 740 | */ |
| 741 | int intel_th_trace_enable(struct intel_th_device *thdev) |
| 742 | { |
| 743 | struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent); |
| 744 | struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver); |
| 745 | |
| 746 | if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH)) |
| 747 | return -EINVAL; |
| 748 | |
| 749 | if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT)) |
| 750 | return -EINVAL; |
| 751 | |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 752 | pm_runtime_get_sync(&thdev->dev); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 753 | hubdrv->enable(hub, &thdev->output); |
| 754 | |
| 755 | return 0; |
| 756 | } |
| 757 | EXPORT_SYMBOL_GPL(intel_th_trace_enable); |
| 758 | |
| 759 | /** |
| 760 | * intel_th_trace_disable() - disable tracing for an output device |
| 761 | * @thdev: output device that requests tracing be disabled |
| 762 | */ |
| 763 | int intel_th_trace_disable(struct intel_th_device *thdev) |
| 764 | { |
| 765 | struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent); |
| 766 | struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver); |
| 767 | |
| 768 | WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH); |
| 769 | if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT)) |
| 770 | return -EINVAL; |
| 771 | |
| 772 | hubdrv->disable(hub, &thdev->output); |
Alexander Shishkin | 142dfeb | 2016-06-22 13:48:21 +0300 | [diff] [blame] | 773 | pm_runtime_put(&thdev->dev); |
Alexander Shishkin | 39f4034 | 2015-09-22 15:47:14 +0300 | [diff] [blame] | 774 | |
| 775 | return 0; |
| 776 | } |
| 777 | EXPORT_SYMBOL_GPL(intel_th_trace_disable); |
| 778 | |
| 779 | int intel_th_set_output(struct intel_th_device *thdev, |
| 780 | unsigned int master) |
| 781 | { |
| 782 | struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent); |
| 783 | struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver); |
| 784 | |
| 785 | if (!hubdrv->set_output) |
| 786 | return -ENOTSUPP; |
| 787 | |
| 788 | return hubdrv->set_output(hub, master); |
| 789 | } |
| 790 | EXPORT_SYMBOL_GPL(intel_th_set_output); |
| 791 | |
| 792 | static int __init intel_th_init(void) |
| 793 | { |
| 794 | intel_th_debug_init(); |
| 795 | |
| 796 | return bus_register(&intel_th_bus); |
| 797 | } |
| 798 | subsys_initcall(intel_th_init); |
| 799 | |
| 800 | static void __exit intel_th_exit(void) |
| 801 | { |
| 802 | intel_th_debug_done(); |
| 803 | |
| 804 | bus_unregister(&intel_th_bus); |
| 805 | } |
| 806 | module_exit(intel_th_exit); |
| 807 | |
| 808 | MODULE_LICENSE("GPL v2"); |
| 809 | MODULE_DESCRIPTION("Intel(R) Trace Hub controller driver"); |
| 810 | MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); |