| 1 | // SPDX-License-Identifier: GPL-1.0+ |
| 2 | /* |
| 3 | * Copyright IBM Corp. 2002, 2009 |
| 4 | * |
| 5 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 6 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
| 7 | */ |
| 8 | #include <linux/export.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/list.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/completion.h> |
| 16 | |
| 17 | #include <asm/ccwdev.h> |
| 18 | #include <asm/idals.h> |
| 19 | #include <asm/chpid.h> |
| 20 | #include <asm/fcx.h> |
| 21 | |
| 22 | #include "cio.h" |
| 23 | #include "cio_debug.h" |
| 24 | #include "css.h" |
| 25 | #include "chsc.h" |
| 26 | #include "device.h" |
| 27 | #include "chp.h" |
| 28 | |
| 29 | /** |
| 30 | * ccw_device_set_options_mask() - set some options and unset the rest |
| 31 | * @cdev: device for which the options are to be set |
| 32 | * @flags: options to be set |
| 33 | * |
| 34 | * All flags specified in @flags are set, all flags not specified in @flags |
| 35 | * are cleared. |
| 36 | * Returns: |
| 37 | * %0 on success, -%EINVAL on an invalid flag combination. |
| 38 | */ |
| 39 | int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags) |
| 40 | { |
| 41 | /* |
| 42 | * The flag usage is mutal exclusive ... |
| 43 | */ |
| 44 | if ((flags & CCWDEV_EARLY_NOTIFICATION) && |
| 45 | (flags & CCWDEV_REPORT_ALL)) |
| 46 | return -EINVAL; |
| 47 | cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0; |
| 48 | cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0; |
| 49 | cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0; |
| 50 | cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0; |
| 51 | cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 0; |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * ccw_device_set_options() - set some options |
| 57 | * @cdev: device for which the options are to be set |
| 58 | * @flags: options to be set |
| 59 | * |
| 60 | * All flags specified in @flags are set, the remainder is left untouched. |
| 61 | * Returns: |
| 62 | * %0 on success, -%EINVAL if an invalid flag combination would ensue. |
| 63 | */ |
| 64 | int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) |
| 65 | { |
| 66 | /* |
| 67 | * The flag usage is mutal exclusive ... |
| 68 | */ |
| 69 | if (((flags & CCWDEV_EARLY_NOTIFICATION) && |
| 70 | (flags & CCWDEV_REPORT_ALL)) || |
| 71 | ((flags & CCWDEV_EARLY_NOTIFICATION) && |
| 72 | cdev->private->options.repall) || |
| 73 | ((flags & CCWDEV_REPORT_ALL) && |
| 74 | cdev->private->options.fast)) |
| 75 | return -EINVAL; |
| 76 | cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0; |
| 77 | cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0; |
| 78 | cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0; |
| 79 | cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0; |
| 80 | cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0; |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * ccw_device_clear_options() - clear some options |
| 86 | * @cdev: device for which the options are to be cleared |
| 87 | * @flags: options to be cleared |
| 88 | * |
| 89 | * All flags specified in @flags are cleared, the remainder is left untouched. |
| 90 | */ |
| 91 | void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags) |
| 92 | { |
| 93 | cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0; |
| 94 | cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0; |
| 95 | cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0; |
| 96 | cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0; |
| 97 | cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * ccw_device_is_pathgroup() - determine if paths to this device are grouped |
| 102 | * @cdev: ccw device |
| 103 | * |
| 104 | * Return non-zero if there is a path group, zero otherwise. |
| 105 | */ |
| 106 | int ccw_device_is_pathgroup(struct ccw_device *cdev) |
| 107 | { |
| 108 | return cdev->private->flags.pgroup; |
| 109 | } |
| 110 | EXPORT_SYMBOL(ccw_device_is_pathgroup); |
| 111 | |
| 112 | /** |
| 113 | * ccw_device_is_multipath() - determine if device is operating in multipath mode |
| 114 | * @cdev: ccw device |
| 115 | * |
| 116 | * Return non-zero if device is operating in multipath mode, zero otherwise. |
| 117 | */ |
| 118 | int ccw_device_is_multipath(struct ccw_device *cdev) |
| 119 | { |
| 120 | return cdev->private->flags.mpath; |
| 121 | } |
| 122 | EXPORT_SYMBOL(ccw_device_is_multipath); |
| 123 | |
| 124 | /** |
| 125 | * ccw_device_clear() - terminate I/O request processing |
| 126 | * @cdev: target ccw device |
| 127 | * @intparm: interruption parameter to be returned upon conclusion of csch |
| 128 | * |
| 129 | * ccw_device_clear() calls csch on @cdev's subchannel. |
| 130 | * Returns: |
| 131 | * %0 on success, |
| 132 | * -%ENODEV on device not operational, |
| 133 | * -%EINVAL on invalid device state. |
| 134 | * Context: |
| 135 | * Interrupts disabled, ccw device lock held |
| 136 | */ |
| 137 | int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm) |
| 138 | { |
| 139 | struct subchannel *sch; |
| 140 | int ret; |
| 141 | |
| 142 | if (!cdev || !cdev->dev.parent) |
| 143 | return -ENODEV; |
| 144 | sch = to_subchannel(cdev->dev.parent); |
| 145 | if (!sch->schib.pmcw.ena) |
| 146 | return -EINVAL; |
| 147 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
| 148 | return -ENODEV; |
| 149 | if (cdev->private->state != DEV_STATE_ONLINE && |
| 150 | cdev->private->state != DEV_STATE_W4SENSE) |
| 151 | return -EINVAL; |
| 152 | |
| 153 | ret = cio_clear(sch); |
| 154 | if (ret == 0) |
| 155 | cdev->private->intparm = intparm; |
| 156 | return ret; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * ccw_device_start_timeout_key() - start a s390 channel program with timeout and key |
| 161 | * @cdev: target ccw device |
| 162 | * @cpa: logical start address of channel program |
| 163 | * @intparm: user specific interruption parameter; will be presented back to |
| 164 | * @cdev's interrupt handler. Allows a device driver to associate |
| 165 | * the interrupt with a particular I/O request. |
| 166 | * @lpm: defines the channel path to be used for a specific I/O request. A |
| 167 | * value of 0 will make cio use the opm. |
| 168 | * @key: storage key to be used for the I/O |
| 169 | * @flags: additional flags; defines the action to be performed for I/O |
| 170 | * processing. |
| 171 | * @expires: timeout value in jiffies |
| 172 | * |
| 173 | * Start a S/390 channel program. When the interrupt arrives, the |
| 174 | * IRQ handler is called, either immediately, delayed (dev-end missing, |
| 175 | * or sense required) or never (no IRQ handler registered). |
| 176 | * This function notifies the device driver if the channel program has not |
| 177 | * completed during the time specified by @expires. If a timeout occurs, the |
| 178 | * channel program is terminated via xsch, hsch or csch, and the device's |
| 179 | * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). |
| 180 | * The interruption handler will echo back the @intparm specified here, unless |
| 181 | * another interruption parameter is specified by a subsequent invocation of |
| 182 | * ccw_device_halt() or ccw_device_clear(). |
| 183 | * Returns: |
| 184 | * %0, if the operation was successful; |
| 185 | * -%EBUSY, if the device is busy, or status pending; |
| 186 | * -%EACCES, if no path specified in @lpm is operational; |
| 187 | * -%ENODEV, if the device is not operational. |
| 188 | * Context: |
| 189 | * Interrupts disabled, ccw device lock held |
| 190 | */ |
| 191 | int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa, |
| 192 | unsigned long intparm, __u8 lpm, __u8 key, |
| 193 | unsigned long flags, int expires) |
| 194 | { |
| 195 | struct subchannel *sch; |
| 196 | int ret; |
| 197 | |
| 198 | if (!cdev || !cdev->dev.parent) |
| 199 | return -ENODEV; |
| 200 | sch = to_subchannel(cdev->dev.parent); |
| 201 | if (!sch->schib.pmcw.ena) |
| 202 | return -EINVAL; |
| 203 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
| 204 | return -ENODEV; |
| 205 | if (cdev->private->state == DEV_STATE_VERIFY) { |
| 206 | /* Remember to fake irb when finished. */ |
| 207 | if (!cdev->private->flags.fake_irb) { |
| 208 | cdev->private->flags.fake_irb = FAKE_CMD_IRB; |
| 209 | cdev->private->intparm = intparm; |
| 210 | return 0; |
| 211 | } else |
| 212 | /* There's already a fake I/O around. */ |
| 213 | return -EBUSY; |
| 214 | } |
| 215 | if (cdev->private->state != DEV_STATE_ONLINE || |
| 216 | ((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) && |
| 217 | !(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)) || |
| 218 | cdev->private->flags.doverify) |
| 219 | return -EBUSY; |
| 220 | ret = cio_set_options (sch, flags); |
| 221 | if (ret) |
| 222 | return ret; |
| 223 | /* Adjust requested path mask to exclude unusable paths. */ |
| 224 | if (lpm) { |
| 225 | lpm &= sch->lpm; |
| 226 | if (lpm == 0) |
| 227 | return -EACCES; |
| 228 | } |
| 229 | ret = cio_start_key (sch, cpa, lpm, key); |
| 230 | switch (ret) { |
| 231 | case 0: |
| 232 | cdev->private->intparm = intparm; |
| 233 | if (expires) |
| 234 | ccw_device_set_timeout(cdev, expires); |
| 235 | break; |
| 236 | case -EACCES: |
| 237 | case -ENODEV: |
| 238 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); |
| 239 | break; |
| 240 | } |
| 241 | return ret; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * ccw_device_start_key() - start a s390 channel program with key |
| 246 | * @cdev: target ccw device |
| 247 | * @cpa: logical start address of channel program |
| 248 | * @intparm: user specific interruption parameter; will be presented back to |
| 249 | * @cdev's interrupt handler. Allows a device driver to associate |
| 250 | * the interrupt with a particular I/O request. |
| 251 | * @lpm: defines the channel path to be used for a specific I/O request. A |
| 252 | * value of 0 will make cio use the opm. |
| 253 | * @key: storage key to be used for the I/O |
| 254 | * @flags: additional flags; defines the action to be performed for I/O |
| 255 | * processing. |
| 256 | * |
| 257 | * Start a S/390 channel program. When the interrupt arrives, the |
| 258 | * IRQ handler is called, either immediately, delayed (dev-end missing, |
| 259 | * or sense required) or never (no IRQ handler registered). |
| 260 | * The interruption handler will echo back the @intparm specified here, unless |
| 261 | * another interruption parameter is specified by a subsequent invocation of |
| 262 | * ccw_device_halt() or ccw_device_clear(). |
| 263 | * Returns: |
| 264 | * %0, if the operation was successful; |
| 265 | * -%EBUSY, if the device is busy, or status pending; |
| 266 | * -%EACCES, if no path specified in @lpm is operational; |
| 267 | * -%ENODEV, if the device is not operational. |
| 268 | * Context: |
| 269 | * Interrupts disabled, ccw device lock held |
| 270 | */ |
| 271 | int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa, |
| 272 | unsigned long intparm, __u8 lpm, __u8 key, |
| 273 | unsigned long flags) |
| 274 | { |
| 275 | return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, key, |
| 276 | flags, 0); |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * ccw_device_start() - start a s390 channel program |
| 281 | * @cdev: target ccw device |
| 282 | * @cpa: logical start address of channel program |
| 283 | * @intparm: user specific interruption parameter; will be presented back to |
| 284 | * @cdev's interrupt handler. Allows a device driver to associate |
| 285 | * the interrupt with a particular I/O request. |
| 286 | * @lpm: defines the channel path to be used for a specific I/O request. A |
| 287 | * value of 0 will make cio use the opm. |
| 288 | * @flags: additional flags; defines the action to be performed for I/O |
| 289 | * processing. |
| 290 | * |
| 291 | * Start a S/390 channel program. When the interrupt arrives, the |
| 292 | * IRQ handler is called, either immediately, delayed (dev-end missing, |
| 293 | * or sense required) or never (no IRQ handler registered). |
| 294 | * The interruption handler will echo back the @intparm specified here, unless |
| 295 | * another interruption parameter is specified by a subsequent invocation of |
| 296 | * ccw_device_halt() or ccw_device_clear(). |
| 297 | * Returns: |
| 298 | * %0, if the operation was successful; |
| 299 | * -%EBUSY, if the device is busy, or status pending; |
| 300 | * -%EACCES, if no path specified in @lpm is operational; |
| 301 | * -%ENODEV, if the device is not operational. |
| 302 | * Context: |
| 303 | * Interrupts disabled, ccw device lock held |
| 304 | */ |
| 305 | int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa, |
| 306 | unsigned long intparm, __u8 lpm, unsigned long flags) |
| 307 | { |
| 308 | return ccw_device_start_key(cdev, cpa, intparm, lpm, |
| 309 | PAGE_DEFAULT_KEY, flags); |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * ccw_device_start_timeout() - start a s390 channel program with timeout |
| 314 | * @cdev: target ccw device |
| 315 | * @cpa: logical start address of channel program |
| 316 | * @intparm: user specific interruption parameter; will be presented back to |
| 317 | * @cdev's interrupt handler. Allows a device driver to associate |
| 318 | * the interrupt with a particular I/O request. |
| 319 | * @lpm: defines the channel path to be used for a specific I/O request. A |
| 320 | * value of 0 will make cio use the opm. |
| 321 | * @flags: additional flags; defines the action to be performed for I/O |
| 322 | * processing. |
| 323 | * @expires: timeout value in jiffies |
| 324 | * |
| 325 | * Start a S/390 channel program. When the interrupt arrives, the |
| 326 | * IRQ handler is called, either immediately, delayed (dev-end missing, |
| 327 | * or sense required) or never (no IRQ handler registered). |
| 328 | * This function notifies the device driver if the channel program has not |
| 329 | * completed during the time specified by @expires. If a timeout occurs, the |
| 330 | * channel program is terminated via xsch, hsch or csch, and the device's |
| 331 | * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). |
| 332 | * The interruption handler will echo back the @intparm specified here, unless |
| 333 | * another interruption parameter is specified by a subsequent invocation of |
| 334 | * ccw_device_halt() or ccw_device_clear(). |
| 335 | * Returns: |
| 336 | * %0, if the operation was successful; |
| 337 | * -%EBUSY, if the device is busy, or status pending; |
| 338 | * -%EACCES, if no path specified in @lpm is operational; |
| 339 | * -%ENODEV, if the device is not operational. |
| 340 | * Context: |
| 341 | * Interrupts disabled, ccw device lock held |
| 342 | */ |
| 343 | int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa, |
| 344 | unsigned long intparm, __u8 lpm, |
| 345 | unsigned long flags, int expires) |
| 346 | { |
| 347 | return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, |
| 348 | PAGE_DEFAULT_KEY, flags, |
| 349 | expires); |
| 350 | } |
| 351 | |
| 352 | |
| 353 | /** |
| 354 | * ccw_device_halt() - halt I/O request processing |
| 355 | * @cdev: target ccw device |
| 356 | * @intparm: interruption parameter to be returned upon conclusion of hsch |
| 357 | * |
| 358 | * ccw_device_halt() calls hsch on @cdev's subchannel. |
| 359 | * The interruption handler will echo back the @intparm specified here, unless |
| 360 | * another interruption parameter is specified by a subsequent invocation of |
| 361 | * ccw_device_clear(). |
| 362 | * Returns: |
| 363 | * %0 on success, |
| 364 | * -%ENODEV on device not operational, |
| 365 | * -%EINVAL on invalid device state, |
| 366 | * -%EBUSY on device busy or interrupt pending. |
| 367 | * Context: |
| 368 | * Interrupts disabled, ccw device lock held |
| 369 | */ |
| 370 | int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm) |
| 371 | { |
| 372 | struct subchannel *sch; |
| 373 | int ret; |
| 374 | |
| 375 | if (!cdev || !cdev->dev.parent) |
| 376 | return -ENODEV; |
| 377 | sch = to_subchannel(cdev->dev.parent); |
| 378 | if (!sch->schib.pmcw.ena) |
| 379 | return -EINVAL; |
| 380 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
| 381 | return -ENODEV; |
| 382 | if (cdev->private->state != DEV_STATE_ONLINE && |
| 383 | cdev->private->state != DEV_STATE_W4SENSE) |
| 384 | return -EINVAL; |
| 385 | |
| 386 | ret = cio_halt(sch); |
| 387 | if (ret == 0) |
| 388 | cdev->private->intparm = intparm; |
| 389 | return ret; |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * ccw_device_resume() - resume channel program execution |
| 394 | * @cdev: target ccw device |
| 395 | * |
| 396 | * ccw_device_resume() calls rsch on @cdev's subchannel. |
| 397 | * Returns: |
| 398 | * %0 on success, |
| 399 | * -%ENODEV on device not operational, |
| 400 | * -%EINVAL on invalid device state, |
| 401 | * -%EBUSY on device busy or interrupt pending. |
| 402 | * Context: |
| 403 | * Interrupts disabled, ccw device lock held |
| 404 | */ |
| 405 | int ccw_device_resume(struct ccw_device *cdev) |
| 406 | { |
| 407 | struct subchannel *sch; |
| 408 | |
| 409 | if (!cdev || !cdev->dev.parent) |
| 410 | return -ENODEV; |
| 411 | sch = to_subchannel(cdev->dev.parent); |
| 412 | if (!sch->schib.pmcw.ena) |
| 413 | return -EINVAL; |
| 414 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
| 415 | return -ENODEV; |
| 416 | if (cdev->private->state != DEV_STATE_ONLINE || |
| 417 | !(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED)) |
| 418 | return -EINVAL; |
| 419 | return cio_resume(sch); |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * ccw_device_get_ciw() - Search for CIW command in extended sense data. |
| 424 | * @cdev: ccw device to inspect |
| 425 | * @ct: command type to look for |
| 426 | * |
| 427 | * During SenseID, command information words (CIWs) describing special |
| 428 | * commands available to the device may have been stored in the extended |
| 429 | * sense data. This function searches for CIWs of a specified command |
| 430 | * type in the extended sense data. |
| 431 | * Returns: |
| 432 | * %NULL if no extended sense data has been stored or if no CIW of the |
| 433 | * specified command type could be found, |
| 434 | * else a pointer to the CIW of the specified command type. |
| 435 | */ |
| 436 | struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct) |
| 437 | { |
| 438 | int ciw_cnt; |
| 439 | |
| 440 | if (cdev->private->flags.esid == 0) |
| 441 | return NULL; |
| 442 | for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++) |
| 443 | if (cdev->private->dma_area->senseid.ciw[ciw_cnt].ct == ct) |
| 444 | return cdev->private->dma_area->senseid.ciw + ciw_cnt; |
| 445 | return NULL; |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * ccw_device_get_path_mask() - get currently available paths |
| 450 | * @cdev: ccw device to be queried |
| 451 | * Returns: |
| 452 | * %0 if no subchannel for the device is available, |
| 453 | * else the mask of currently available paths for the ccw device's subchannel. |
| 454 | */ |
| 455 | __u8 ccw_device_get_path_mask(struct ccw_device *cdev) |
| 456 | { |
| 457 | struct subchannel *sch; |
| 458 | |
| 459 | if (!cdev->dev.parent) |
| 460 | return 0; |
| 461 | |
| 462 | sch = to_subchannel(cdev->dev.parent); |
| 463 | return sch->lpm; |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | * ccw_device_get_chp_desc() - return newly allocated channel-path descriptor |
| 468 | * @cdev: device to obtain the descriptor for |
| 469 | * @chp_idx: index of the channel path |
| 470 | * |
| 471 | * On success return a newly allocated copy of the channel-path description |
| 472 | * data associated with the given channel path. Return %NULL on error. |
| 473 | */ |
| 474 | struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *cdev, |
| 475 | int chp_idx) |
| 476 | { |
| 477 | struct subchannel *sch; |
| 478 | struct chp_id chpid; |
| 479 | |
| 480 | sch = to_subchannel(cdev->dev.parent); |
| 481 | chp_id_init(&chpid); |
| 482 | chpid.id = sch->schib.pmcw.chpid[chp_idx]; |
| 483 | return chp_get_chp_desc(chpid); |
| 484 | } |
| 485 | |
| 486 | /** |
| 487 | * ccw_device_get_util_str() - return newly allocated utility strings |
| 488 | * @cdev: device to obtain the utility strings for |
| 489 | * @chp_idx: index of the channel path |
| 490 | * |
| 491 | * On success return a newly allocated copy of the utility strings |
| 492 | * associated with the given channel path. Return %NULL on error. |
| 493 | */ |
| 494 | u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx) |
| 495 | { |
| 496 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| 497 | struct channel_path *chp; |
| 498 | struct chp_id chpid; |
| 499 | u8 *util_str; |
| 500 | |
| 501 | chp_id_init(&chpid); |
| 502 | chpid.id = sch->schib.pmcw.chpid[chp_idx]; |
| 503 | chp = chpid_to_chp(chpid); |
| 504 | |
| 505 | util_str = kmalloc(sizeof(chp->desc_fmt3.util_str), GFP_KERNEL); |
| 506 | if (!util_str) |
| 507 | return NULL; |
| 508 | |
| 509 | mutex_lock(&chp->lock); |
| 510 | memcpy(util_str, chp->desc_fmt3.util_str, sizeof(chp->desc_fmt3.util_str)); |
| 511 | mutex_unlock(&chp->lock); |
| 512 | |
| 513 | return util_str; |
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * ccw_device_get_id() - obtain a ccw device id |
| 518 | * @cdev: device to obtain the id for |
| 519 | * @dev_id: where to fill in the values |
| 520 | */ |
| 521 | void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id) |
| 522 | { |
| 523 | *dev_id = cdev->private->dev_id; |
| 524 | } |
| 525 | EXPORT_SYMBOL(ccw_device_get_id); |
| 526 | |
| 527 | /** |
| 528 | * ccw_device_tm_start_timeout_key() - perform start function |
| 529 | * @cdev: ccw device on which to perform the start function |
| 530 | * @tcw: transport-command word to be started |
| 531 | * @intparm: user defined parameter to be passed to the interrupt handler |
| 532 | * @lpm: mask of paths to use |
| 533 | * @key: storage key to use for storage access |
| 534 | * @expires: time span in jiffies after which to abort request |
| 535 | * |
| 536 | * Start the tcw on the given ccw device. Return zero on success, non-zero |
| 537 | * otherwise. |
| 538 | */ |
| 539 | int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw, |
| 540 | unsigned long intparm, u8 lpm, u8 key, |
| 541 | int expires) |
| 542 | { |
| 543 | struct subchannel *sch; |
| 544 | int rc; |
| 545 | |
| 546 | sch = to_subchannel(cdev->dev.parent); |
| 547 | if (!sch->schib.pmcw.ena) |
| 548 | return -EINVAL; |
| 549 | if (cdev->private->state == DEV_STATE_VERIFY) { |
| 550 | /* Remember to fake irb when finished. */ |
| 551 | if (!cdev->private->flags.fake_irb) { |
| 552 | cdev->private->flags.fake_irb = FAKE_TM_IRB; |
| 553 | cdev->private->intparm = intparm; |
| 554 | return 0; |
| 555 | } else |
| 556 | /* There's already a fake I/O around. */ |
| 557 | return -EBUSY; |
| 558 | } |
| 559 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 560 | return -EIO; |
| 561 | /* Adjust requested path mask to exclude unusable paths. */ |
| 562 | if (lpm) { |
| 563 | lpm &= sch->lpm; |
| 564 | if (lpm == 0) |
| 565 | return -EACCES; |
| 566 | } |
| 567 | rc = cio_tm_start_key(sch, tcw, lpm, key); |
| 568 | if (rc == 0) { |
| 569 | cdev->private->intparm = intparm; |
| 570 | if (expires) |
| 571 | ccw_device_set_timeout(cdev, expires); |
| 572 | } |
| 573 | return rc; |
| 574 | } |
| 575 | EXPORT_SYMBOL(ccw_device_tm_start_timeout_key); |
| 576 | |
| 577 | /** |
| 578 | * ccw_device_tm_start_key() - perform start function |
| 579 | * @cdev: ccw device on which to perform the start function |
| 580 | * @tcw: transport-command word to be started |
| 581 | * @intparm: user defined parameter to be passed to the interrupt handler |
| 582 | * @lpm: mask of paths to use |
| 583 | * @key: storage key to use for storage access |
| 584 | * |
| 585 | * Start the tcw on the given ccw device. Return zero on success, non-zero |
| 586 | * otherwise. |
| 587 | */ |
| 588 | int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw, |
| 589 | unsigned long intparm, u8 lpm, u8 key) |
| 590 | { |
| 591 | return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, key, 0); |
| 592 | } |
| 593 | EXPORT_SYMBOL(ccw_device_tm_start_key); |
| 594 | |
| 595 | /** |
| 596 | * ccw_device_tm_start() - perform start function |
| 597 | * @cdev: ccw device on which to perform the start function |
| 598 | * @tcw: transport-command word to be started |
| 599 | * @intparm: user defined parameter to be passed to the interrupt handler |
| 600 | * @lpm: mask of paths to use |
| 601 | * |
| 602 | * Start the tcw on the given ccw device. Return zero on success, non-zero |
| 603 | * otherwise. |
| 604 | */ |
| 605 | int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw, |
| 606 | unsigned long intparm, u8 lpm) |
| 607 | { |
| 608 | return ccw_device_tm_start_key(cdev, tcw, intparm, lpm, |
| 609 | PAGE_DEFAULT_KEY); |
| 610 | } |
| 611 | EXPORT_SYMBOL(ccw_device_tm_start); |
| 612 | |
| 613 | /** |
| 614 | * ccw_device_tm_start_timeout() - perform start function |
| 615 | * @cdev: ccw device on which to perform the start function |
| 616 | * @tcw: transport-command word to be started |
| 617 | * @intparm: user defined parameter to be passed to the interrupt handler |
| 618 | * @lpm: mask of paths to use |
| 619 | * @expires: time span in jiffies after which to abort request |
| 620 | * |
| 621 | * Start the tcw on the given ccw device. Return zero on success, non-zero |
| 622 | * otherwise. |
| 623 | */ |
| 624 | int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw, |
| 625 | unsigned long intparm, u8 lpm, int expires) |
| 626 | { |
| 627 | return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, |
| 628 | PAGE_DEFAULT_KEY, expires); |
| 629 | } |
| 630 | EXPORT_SYMBOL(ccw_device_tm_start_timeout); |
| 631 | |
| 632 | /** |
| 633 | * ccw_device_get_mdc() - accumulate max data count |
| 634 | * @cdev: ccw device for which the max data count is accumulated |
| 635 | * @mask: mask of paths to use |
| 636 | * |
| 637 | * Return the number of 64K-bytes blocks all paths at least support |
| 638 | * for a transport command. Return value 0 indicates failure. |
| 639 | */ |
| 640 | int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask) |
| 641 | { |
| 642 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| 643 | struct channel_path *chp; |
| 644 | struct chp_id chpid; |
| 645 | int mdc = 0, i; |
| 646 | |
| 647 | /* Adjust requested path mask to excluded varied off paths. */ |
| 648 | if (mask) |
| 649 | mask &= sch->lpm; |
| 650 | else |
| 651 | mask = sch->lpm; |
| 652 | |
| 653 | chp_id_init(&chpid); |
| 654 | for (i = 0; i < 8; i++) { |
| 655 | if (!(mask & (0x80 >> i))) |
| 656 | continue; |
| 657 | chpid.id = sch->schib.pmcw.chpid[i]; |
| 658 | chp = chpid_to_chp(chpid); |
| 659 | if (!chp) |
| 660 | continue; |
| 661 | |
| 662 | mutex_lock(&chp->lock); |
| 663 | if (!chp->desc_fmt1.f) { |
| 664 | mutex_unlock(&chp->lock); |
| 665 | return 0; |
| 666 | } |
| 667 | if (!chp->desc_fmt1.r) |
| 668 | mdc = 1; |
| 669 | mdc = mdc ? min_t(int, mdc, chp->desc_fmt1.mdc) : |
| 670 | chp->desc_fmt1.mdc; |
| 671 | mutex_unlock(&chp->lock); |
| 672 | } |
| 673 | |
| 674 | return mdc; |
| 675 | } |
| 676 | EXPORT_SYMBOL(ccw_device_get_mdc); |
| 677 | |
| 678 | /** |
| 679 | * ccw_device_tm_intrg() - perform interrogate function |
| 680 | * @cdev: ccw device on which to perform the interrogate function |
| 681 | * |
| 682 | * Perform an interrogate function on the given ccw device. Return zero on |
| 683 | * success, non-zero otherwise. |
| 684 | */ |
| 685 | int ccw_device_tm_intrg(struct ccw_device *cdev) |
| 686 | { |
| 687 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| 688 | |
| 689 | if (!sch->schib.pmcw.ena) |
| 690 | return -EINVAL; |
| 691 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 692 | return -EIO; |
| 693 | if (!scsw_is_tm(&sch->schib.scsw) || |
| 694 | !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND)) |
| 695 | return -EINVAL; |
| 696 | return cio_tm_intrg(sch); |
| 697 | } |
| 698 | EXPORT_SYMBOL(ccw_device_tm_intrg); |
| 699 | |
| 700 | /** |
| 701 | * ccw_device_get_schid() - obtain a subchannel id |
| 702 | * @cdev: device to obtain the id for |
| 703 | * @schid: where to fill in the values |
| 704 | */ |
| 705 | void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid) |
| 706 | { |
| 707 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| 708 | |
| 709 | *schid = sch->schid; |
| 710 | } |
| 711 | EXPORT_SYMBOL_GPL(ccw_device_get_schid); |
| 712 | |
| 713 | /** |
| 714 | * ccw_device_pnso() - Perform Network-Subchannel Operation |
| 715 | * @cdev: device on which PNSO is performed |
| 716 | * @pnso_area: request and response block for the operation |
| 717 | * @oc: Operation Code |
| 718 | * @resume_token: resume token for multiblock response |
| 719 | * @cnc: Boolean change-notification control |
| 720 | * |
| 721 | * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL) |
| 722 | * |
| 723 | * Returns 0 on success. |
| 724 | */ |
| 725 | int ccw_device_pnso(struct ccw_device *cdev, |
| 726 | struct chsc_pnso_area *pnso_area, u8 oc, |
| 727 | struct chsc_pnso_resume_token resume_token, int cnc) |
| 728 | { |
| 729 | struct subchannel_id schid; |
| 730 | |
| 731 | ccw_device_get_schid(cdev, &schid); |
| 732 | return chsc_pnso(schid, pnso_area, oc, resume_token, cnc); |
| 733 | } |
| 734 | EXPORT_SYMBOL_GPL(ccw_device_pnso); |
| 735 | |
| 736 | /** |
| 737 | * ccw_device_get_cssid() - obtain Channel Subsystem ID |
| 738 | * @cdev: device to obtain the CSSID for |
| 739 | * @cssid: The resulting Channel Subsystem ID |
| 740 | */ |
| 741 | int ccw_device_get_cssid(struct ccw_device *cdev, u8 *cssid) |
| 742 | { |
| 743 | struct device *sch_dev = cdev->dev.parent; |
| 744 | struct channel_subsystem *css = to_css(sch_dev->parent); |
| 745 | |
| 746 | if (css->id_valid) |
| 747 | *cssid = css->cssid; |
| 748 | return css->id_valid ? 0 : -ENODEV; |
| 749 | } |
| 750 | EXPORT_SYMBOL_GPL(ccw_device_get_cssid); |
| 751 | |
| 752 | /** |
| 753 | * ccw_device_get_iid() - obtain MIF-image ID |
| 754 | * @cdev: device to obtain the MIF-image ID for |
| 755 | * @iid: The resulting MIF-image ID |
| 756 | */ |
| 757 | int ccw_device_get_iid(struct ccw_device *cdev, u8 *iid) |
| 758 | { |
| 759 | struct device *sch_dev = cdev->dev.parent; |
| 760 | struct channel_subsystem *css = to_css(sch_dev->parent); |
| 761 | |
| 762 | if (css->id_valid) |
| 763 | *iid = css->iid; |
| 764 | return css->id_valid ? 0 : -ENODEV; |
| 765 | } |
| 766 | EXPORT_SYMBOL_GPL(ccw_device_get_iid); |
| 767 | |
| 768 | /** |
| 769 | * ccw_device_get_chpid() - obtain Channel Path ID |
| 770 | * @cdev: device to obtain the Channel Path ID for |
| 771 | * @chp_idx: Index of the channel path |
| 772 | * @chpid: The resulting Channel Path ID |
| 773 | */ |
| 774 | int ccw_device_get_chpid(struct ccw_device *cdev, int chp_idx, u8 *chpid) |
| 775 | { |
| 776 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| 777 | int mask; |
| 778 | |
| 779 | if ((chp_idx < 0) || (chp_idx > 7)) |
| 780 | return -EINVAL; |
| 781 | mask = 0x80 >> chp_idx; |
| 782 | if (!(sch->schib.pmcw.pim & mask)) |
| 783 | return -ENODEV; |
| 784 | |
| 785 | *chpid = sch->schib.pmcw.chpid[chp_idx]; |
| 786 | return 0; |
| 787 | } |
| 788 | EXPORT_SYMBOL_GPL(ccw_device_get_chpid); |
| 789 | |
| 790 | /** |
| 791 | * ccw_device_get_chid() - obtain Channel ID associated with specified CHPID |
| 792 | * @cdev: device to obtain the Channel ID for |
| 793 | * @chp_idx: Index of the channel path |
| 794 | * @chid: The resulting Channel ID |
| 795 | */ |
| 796 | int ccw_device_get_chid(struct ccw_device *cdev, int chp_idx, u16 *chid) |
| 797 | { |
| 798 | struct chp_id cssid_chpid; |
| 799 | struct channel_path *chp; |
| 800 | int rc; |
| 801 | |
| 802 | chp_id_init(&cssid_chpid); |
| 803 | rc = ccw_device_get_chpid(cdev, chp_idx, &cssid_chpid.id); |
| 804 | if (rc) |
| 805 | return rc; |
| 806 | chp = chpid_to_chp(cssid_chpid); |
| 807 | if (!chp) |
| 808 | return -ENODEV; |
| 809 | |
| 810 | mutex_lock(&chp->lock); |
| 811 | if (chp->desc_fmt1.flags & 0x10) |
| 812 | *chid = chp->desc_fmt1.chid; |
| 813 | else |
| 814 | rc = -ENODEV; |
| 815 | mutex_unlock(&chp->lock); |
| 816 | |
| 817 | return rc; |
| 818 | } |
| 819 | EXPORT_SYMBOL_GPL(ccw_device_get_chid); |
| 820 | |
| 821 | /* |
| 822 | * Allocate zeroed dma coherent 31 bit addressable memory using |
| 823 | * the subchannels dma pool. Maximal size of allocation supported |
| 824 | * is PAGE_SIZE. |
| 825 | */ |
| 826 | void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size) |
| 827 | { |
| 828 | void *addr; |
| 829 | |
| 830 | if (!get_device(&cdev->dev)) |
| 831 | return NULL; |
| 832 | addr = cio_gp_dma_zalloc(cdev->private->dma_pool, &cdev->dev, size); |
| 833 | if (IS_ERR_OR_NULL(addr)) |
| 834 | put_device(&cdev->dev); |
| 835 | return addr; |
| 836 | } |
| 837 | EXPORT_SYMBOL(ccw_device_dma_zalloc); |
| 838 | |
| 839 | void ccw_device_dma_free(struct ccw_device *cdev, void *cpu_addr, size_t size) |
| 840 | { |
| 841 | if (!cpu_addr) |
| 842 | return; |
| 843 | cio_gp_dma_free(cdev->private->dma_pool, cpu_addr, size); |
| 844 | put_device(&cdev->dev); |
| 845 | } |
| 846 | EXPORT_SYMBOL(ccw_device_dma_free); |
| 847 | |
| 848 | EXPORT_SYMBOL(ccw_device_set_options_mask); |
| 849 | EXPORT_SYMBOL(ccw_device_set_options); |
| 850 | EXPORT_SYMBOL(ccw_device_clear_options); |
| 851 | EXPORT_SYMBOL(ccw_device_clear); |
| 852 | EXPORT_SYMBOL(ccw_device_halt); |
| 853 | EXPORT_SYMBOL(ccw_device_resume); |
| 854 | EXPORT_SYMBOL(ccw_device_start_timeout); |
| 855 | EXPORT_SYMBOL(ccw_device_start); |
| 856 | EXPORT_SYMBOL(ccw_device_start_timeout_key); |
| 857 | EXPORT_SYMBOL(ccw_device_start_key); |
| 858 | EXPORT_SYMBOL(ccw_device_get_ciw); |
| 859 | EXPORT_SYMBOL(ccw_device_get_path_mask); |
| 860 | EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc); |
| 861 | EXPORT_SYMBOL_GPL(ccw_device_get_util_str); |