Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Linux driver for System z and s390 unit record devices |
| 3 | * (z/VM virtual punch, reader, printer) |
| 4 | * |
| 5 | * Copyright IBM Corp. 2001, 2007 |
| 6 | * Authors: Malcolm Beattie <beattiem@uk.ibm.com> |
| 7 | * Michael Holzheu <holzheu@de.ibm.com> |
| 8 | * Frank Munzert <munzert@de.ibm.com> |
| 9 | */ |
| 10 | |
| 11 | #include <linux/cdev.h> |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame^] | 12 | #include <linux/smp_lock.h> |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 13 | |
| 14 | #include <asm/uaccess.h> |
| 15 | #include <asm/cio.h> |
| 16 | #include <asm/ccwdev.h> |
| 17 | #include <asm/debug.h> |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 18 | #include <asm/diag.h> |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 19 | |
| 20 | #include "vmur.h" |
| 21 | |
| 22 | /* |
| 23 | * Driver overview |
| 24 | * |
| 25 | * Unit record device support is implemented as a character device driver. |
| 26 | * We can fit at least 16 bits into a device minor number and use the |
| 27 | * simple method of mapping a character device number with minor abcd |
| 28 | * to the unit record device with devno abcd. |
| 29 | * I/O to virtual unit record devices is handled as follows: |
| 30 | * Reads: Diagnose code 0x14 (input spool file manipulation) |
| 31 | * is used to read spool data page-wise. |
| 32 | * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length |
| 33 | * is available by reading sysfs attr reclen. Each write() to the device |
| 34 | * must specify an integral multiple (maximal 511) of reclen. |
| 35 | */ |
| 36 | |
| 37 | static char ur_banner[] = "z/VM virtual unit record device driver"; |
| 38 | |
| 39 | MODULE_AUTHOR("IBM Corporation"); |
| 40 | MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver"); |
| 41 | MODULE_LICENSE("GPL"); |
| 42 | |
| 43 | #define PRINTK_HEADER "vmur: " |
| 44 | |
| 45 | static dev_t ur_first_dev_maj_min; |
| 46 | static struct class *vmur_class; |
| 47 | static struct debug_info *vmur_dbf; |
| 48 | |
| 49 | /* We put the device's record length (for writes) in the driver_info field */ |
| 50 | static struct ccw_device_id ur_ids[] = { |
| 51 | { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) }, |
| 52 | { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) }, |
| 53 | { /* end of list */ } |
| 54 | }; |
| 55 | |
| 56 | MODULE_DEVICE_TABLE(ccw, ur_ids); |
| 57 | |
| 58 | static int ur_probe(struct ccw_device *cdev); |
| 59 | static void ur_remove(struct ccw_device *cdev); |
| 60 | static int ur_set_online(struct ccw_device *cdev); |
| 61 | static int ur_set_offline(struct ccw_device *cdev); |
| 62 | |
| 63 | static struct ccw_driver ur_driver = { |
| 64 | .name = "vmur", |
| 65 | .owner = THIS_MODULE, |
| 66 | .ids = ur_ids, |
| 67 | .probe = ur_probe, |
| 68 | .remove = ur_remove, |
| 69 | .set_online = ur_set_online, |
| 70 | .set_offline = ur_set_offline, |
| 71 | }; |
| 72 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 73 | static DEFINE_MUTEX(vmur_mutex); |
| 74 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 75 | /* |
| 76 | * Allocation, freeing, getting and putting of urdev structures |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 77 | * |
| 78 | * Each ur device (urd) contains a reference to its corresponding ccw device |
| 79 | * (cdev) using the urd->cdev pointer. Each ccw device has a reference to the |
| 80 | * ur device using the cdev->dev.driver_data pointer. |
| 81 | * |
| 82 | * urd references: |
| 83 | * - ur_probe gets a urd reference, ur_remove drops the reference |
| 84 | * (cdev->dev.driver_data) |
| 85 | * - ur_open gets a urd reference, ur_relase drops the reference |
| 86 | * (urf->urd) |
| 87 | * |
| 88 | * cdev references: |
| 89 | * - urdev_alloc get a cdev reference (urd->cdev) |
| 90 | * - urdev_free drops the cdev reference (urd->cdev) |
| 91 | * |
| 92 | * Setting and clearing of cdev->dev.driver_data is protected by the ccwdev lock |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 93 | */ |
| 94 | static struct urdev *urdev_alloc(struct ccw_device *cdev) |
| 95 | { |
| 96 | struct urdev *urd; |
| 97 | |
| 98 | urd = kzalloc(sizeof(struct urdev), GFP_KERNEL); |
| 99 | if (!urd) |
| 100 | return NULL; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 101 | urd->reclen = cdev->id.driver_info; |
| 102 | ccw_device_get_id(cdev, &urd->dev_id); |
| 103 | mutex_init(&urd->io_mutex); |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 104 | init_waitqueue_head(&urd->wait); |
| 105 | spin_lock_init(&urd->open_lock); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 106 | atomic_set(&urd->ref_count, 1); |
| 107 | urd->cdev = cdev; |
| 108 | get_device(&cdev->dev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 109 | return urd; |
| 110 | } |
| 111 | |
| 112 | static void urdev_free(struct urdev *urd) |
| 113 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 114 | TRACE("urdev_free: %p\n", urd); |
| 115 | if (urd->cdev) |
| 116 | put_device(&urd->cdev->dev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 117 | kfree(urd); |
| 118 | } |
| 119 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 120 | static void urdev_get(struct urdev *urd) |
| 121 | { |
| 122 | atomic_inc(&urd->ref_count); |
| 123 | } |
| 124 | |
| 125 | static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev) |
| 126 | { |
| 127 | struct urdev *urd; |
| 128 | unsigned long flags; |
| 129 | |
| 130 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 131 | urd = cdev->dev.driver_data; |
| 132 | if (urd) |
| 133 | urdev_get(urd); |
| 134 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 135 | return urd; |
| 136 | } |
| 137 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 138 | static struct urdev *urdev_get_from_devno(u16 devno) |
| 139 | { |
| 140 | char bus_id[16]; |
| 141 | struct ccw_device *cdev; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 142 | struct urdev *urd; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 143 | |
| 144 | sprintf(bus_id, "0.0.%04x", devno); |
| 145 | cdev = get_ccwdev_by_busid(&ur_driver, bus_id); |
| 146 | if (!cdev) |
| 147 | return NULL; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 148 | urd = urdev_get_from_cdev(cdev); |
| 149 | put_device(&cdev->dev); |
| 150 | return urd; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | static void urdev_put(struct urdev *urd) |
| 154 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 155 | if (atomic_dec_and_test(&urd->ref_count)) |
| 156 | urdev_free(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Low-level functions to do I/O to a ur device. |
| 161 | * alloc_chan_prog |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 162 | * free_chan_prog |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 163 | * do_ur_io |
| 164 | * ur_int_handler |
| 165 | * |
| 166 | * alloc_chan_prog allocates and builds the channel program |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 167 | * free_chan_prog frees memory of the channel program |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 168 | * |
| 169 | * do_ur_io issues the channel program to the device and blocks waiting |
| 170 | * on a completion event it publishes at urd->io_done. The function |
| 171 | * serialises itself on the device's mutex so that only one I/O |
| 172 | * is issued at a time (and that I/O is synchronous). |
| 173 | * |
| 174 | * ur_int_handler catches the "I/O done" interrupt, writes the |
| 175 | * subchannel status word into the scsw member of the urdev structure |
| 176 | * and complete()s the io_done to wake the waiting do_ur_io. |
| 177 | * |
| 178 | * The caller of do_ur_io is responsible for kfree()ing the channel program |
| 179 | * address pointer that alloc_chan_prog returned. |
| 180 | */ |
| 181 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 182 | static void free_chan_prog(struct ccw1 *cpa) |
| 183 | { |
| 184 | struct ccw1 *ptr = cpa; |
| 185 | |
| 186 | while (ptr->cda) { |
| 187 | kfree((void *)(addr_t) ptr->cda); |
| 188 | ptr++; |
| 189 | } |
| 190 | kfree(cpa); |
| 191 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 192 | |
| 193 | /* |
| 194 | * alloc_chan_prog |
| 195 | * The channel program we use is write commands chained together |
| 196 | * with a final NOP CCW command-chained on (which ensures that CE and DE |
| 197 | * are presented together in a single interrupt instead of as separate |
| 198 | * interrupts unless an incorrect length indication kicks in first). The |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 199 | * data length in each CCW is reclen. |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 200 | */ |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 201 | static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count, |
| 202 | int reclen) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 203 | { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 204 | struct ccw1 *cpa; |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 205 | void *kbuf; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 206 | int i; |
| 207 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 208 | TRACE("alloc_chan_prog(%p, %i, %i)\n", ubuf, rec_count, reclen); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 209 | |
| 210 | /* |
| 211 | * We chain a NOP onto the writes to force CE+DE together. |
| 212 | * That means we allocate room for CCWs to cover count/reclen |
| 213 | * records plus a NOP. |
| 214 | */ |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 215 | cpa = kzalloc((rec_count + 1) * sizeof(struct ccw1), |
| 216 | GFP_KERNEL | GFP_DMA); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 217 | if (!cpa) |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 218 | return ERR_PTR(-ENOMEM); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 219 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 220 | for (i = 0; i < rec_count; i++) { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 221 | cpa[i].cmd_code = WRITE_CCW_CMD; |
| 222 | cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI; |
| 223 | cpa[i].count = reclen; |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 224 | kbuf = kmalloc(reclen, GFP_KERNEL | GFP_DMA); |
| 225 | if (!kbuf) { |
| 226 | free_chan_prog(cpa); |
| 227 | return ERR_PTR(-ENOMEM); |
| 228 | } |
| 229 | cpa[i].cda = (u32)(addr_t) kbuf; |
| 230 | if (copy_from_user(kbuf, ubuf, reclen)) { |
| 231 | free_chan_prog(cpa); |
| 232 | return ERR_PTR(-EFAULT); |
| 233 | } |
| 234 | ubuf += reclen; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 235 | } |
| 236 | /* The following NOP CCW forces CE+DE to be presented together */ |
| 237 | cpa[i].cmd_code = CCW_CMD_NOOP; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 238 | return cpa; |
| 239 | } |
| 240 | |
| 241 | static int do_ur_io(struct urdev *urd, struct ccw1 *cpa) |
| 242 | { |
| 243 | int rc; |
| 244 | struct ccw_device *cdev = urd->cdev; |
Heiko Carstens | 278bc68 | 2007-08-10 14:32:31 +0200 | [diff] [blame] | 245 | DECLARE_COMPLETION_ONSTACK(event); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 246 | |
| 247 | TRACE("do_ur_io: cpa=%p\n", cpa); |
| 248 | |
| 249 | rc = mutex_lock_interruptible(&urd->io_mutex); |
| 250 | if (rc) |
| 251 | return rc; |
| 252 | |
| 253 | urd->io_done = &event; |
| 254 | |
| 255 | spin_lock_irq(get_ccwdev_lock(cdev)); |
| 256 | rc = ccw_device_start(cdev, cpa, 1, 0, 0); |
| 257 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
| 258 | |
| 259 | TRACE("do_ur_io: ccw_device_start returned %d\n", rc); |
| 260 | if (rc) |
| 261 | goto out; |
| 262 | |
| 263 | wait_for_completion(&event); |
| 264 | TRACE("do_ur_io: I/O complete\n"); |
| 265 | rc = 0; |
| 266 | |
| 267 | out: |
| 268 | mutex_unlock(&urd->io_mutex); |
| 269 | return rc; |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * ur interrupt handler, called from the ccw_device layer |
| 274 | */ |
| 275 | static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm, |
| 276 | struct irb *irb) |
| 277 | { |
| 278 | struct urdev *urd; |
| 279 | |
| 280 | TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n", |
| 281 | intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count); |
| 282 | |
| 283 | if (!intparm) { |
| 284 | TRACE("ur_int_handler: unsolicited interrupt\n"); |
| 285 | return; |
| 286 | } |
| 287 | urd = cdev->dev.driver_data; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 288 | BUG_ON(!urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 289 | /* On special conditions irb is an error pointer */ |
| 290 | if (IS_ERR(irb)) |
| 291 | urd->io_request_rc = PTR_ERR(irb); |
| 292 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END)) |
| 293 | urd->io_request_rc = 0; |
| 294 | else |
| 295 | urd->io_request_rc = -EIO; |
| 296 | |
| 297 | complete(urd->io_done); |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * reclen sysfs attribute - The record length to be used for write CCWs |
| 302 | */ |
| 303 | static ssize_t ur_attr_reclen_show(struct device *dev, |
| 304 | struct device_attribute *attr, char *buf) |
| 305 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 306 | struct urdev *urd; |
| 307 | int rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 308 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 309 | urd = urdev_get_from_cdev(to_ccwdev(dev)); |
| 310 | if (!urd) |
| 311 | return -ENODEV; |
| 312 | rc = sprintf(buf, "%zu\n", urd->reclen); |
| 313 | urdev_put(urd); |
| 314 | return rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL); |
| 318 | |
| 319 | static int ur_create_attributes(struct device *dev) |
| 320 | { |
| 321 | return device_create_file(dev, &dev_attr_reclen); |
| 322 | } |
| 323 | |
| 324 | static void ur_remove_attributes(struct device *dev) |
| 325 | { |
| 326 | device_remove_file(dev, &dev_attr_reclen); |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * diagnose code 0x210 - retrieve device information |
| 331 | * cc=0 normal completion, we have a real device |
| 332 | * cc=1 CP paging error |
| 333 | * cc=2 The virtual device exists, but is not associated with a real device |
| 334 | * cc=3 Invalid device address, or the virtual device does not exist |
| 335 | */ |
| 336 | static int get_urd_class(struct urdev *urd) |
| 337 | { |
| 338 | static struct diag210 ur_diag210; |
| 339 | int cc; |
| 340 | |
| 341 | ur_diag210.vrdcdvno = urd->dev_id.devno; |
| 342 | ur_diag210.vrdclen = sizeof(struct diag210); |
| 343 | |
| 344 | cc = diag210(&ur_diag210); |
| 345 | switch (cc) { |
| 346 | case 0: |
| 347 | return -ENOTSUPP; |
| 348 | case 2: |
| 349 | return ur_diag210.vrdcvcla; /* virtual device class */ |
| 350 | case 3: |
| 351 | return -ENODEV; |
| 352 | default: |
| 353 | return -EIO; |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * Allocation and freeing of urfile structures |
| 359 | */ |
| 360 | static struct urfile *urfile_alloc(struct urdev *urd) |
| 361 | { |
| 362 | struct urfile *urf; |
| 363 | |
| 364 | urf = kzalloc(sizeof(struct urfile), GFP_KERNEL); |
| 365 | if (!urf) |
| 366 | return NULL; |
| 367 | urf->urd = urd; |
| 368 | |
| 369 | TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf, |
| 370 | urf->dev_reclen); |
| 371 | |
| 372 | return urf; |
| 373 | } |
| 374 | |
| 375 | static void urfile_free(struct urfile *urf) |
| 376 | { |
| 377 | TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd); |
| 378 | kfree(urf); |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * The fops implementation of the character device driver |
| 383 | */ |
| 384 | static ssize_t do_write(struct urdev *urd, const char __user *udata, |
| 385 | size_t count, size_t reclen, loff_t *ppos) |
| 386 | { |
| 387 | struct ccw1 *cpa; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 388 | int rc; |
| 389 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 390 | cpa = alloc_chan_prog(udata, count / reclen, reclen); |
| 391 | if (IS_ERR(cpa)) |
| 392 | return PTR_ERR(cpa); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 393 | |
| 394 | rc = do_ur_io(urd, cpa); |
| 395 | if (rc) |
| 396 | goto fail_kfree_cpa; |
| 397 | |
| 398 | if (urd->io_request_rc) { |
| 399 | rc = urd->io_request_rc; |
| 400 | goto fail_kfree_cpa; |
| 401 | } |
| 402 | *ppos += count; |
| 403 | rc = count; |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 404 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 405 | fail_kfree_cpa: |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 406 | free_chan_prog(cpa); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 407 | return rc; |
| 408 | } |
| 409 | |
| 410 | static ssize_t ur_write(struct file *file, const char __user *udata, |
| 411 | size_t count, loff_t *ppos) |
| 412 | { |
| 413 | struct urfile *urf = file->private_data; |
| 414 | |
| 415 | TRACE("ur_write: count=%zu\n", count); |
| 416 | |
| 417 | if (count == 0) |
| 418 | return 0; |
| 419 | |
| 420 | if (count % urf->dev_reclen) |
| 421 | return -EINVAL; /* count must be a multiple of reclen */ |
| 422 | |
| 423 | if (count > urf->dev_reclen * MAX_RECS_PER_IO) |
| 424 | count = urf->dev_reclen * MAX_RECS_PER_IO; |
| 425 | |
| 426 | return do_write(urf->urd, udata, count, urf->dev_reclen, ppos); |
| 427 | } |
| 428 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 429 | /* |
| 430 | * diagnose code 0x14 subcode 0x0028 - position spool file to designated |
| 431 | * record |
| 432 | * cc=0 normal completion |
| 433 | * cc=2 no file active on the virtual reader or device not ready |
| 434 | * cc=3 record specified is beyond EOF |
| 435 | */ |
| 436 | static int diag_position_to_record(int devno, int record) |
| 437 | { |
| 438 | int cc; |
| 439 | |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 440 | cc = diag14(record, devno, 0x28); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 441 | switch (cc) { |
| 442 | case 0: |
| 443 | return 0; |
| 444 | case 2: |
| 445 | return -ENOMEDIUM; |
| 446 | case 3: |
| 447 | return -ENODATA; /* position beyond end of file */ |
| 448 | default: |
| 449 | return -EIO; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * diagnose code 0x14 subcode 0x0000 - read next spool file buffer |
| 455 | * cc=0 normal completion |
| 456 | * cc=1 EOF reached |
| 457 | * cc=2 no file active on the virtual reader, and no file eligible |
| 458 | * cc=3 file already active on the virtual reader or specified virtual |
| 459 | * reader does not exist or is not a reader |
| 460 | */ |
| 461 | static int diag_read_file(int devno, char *buf) |
| 462 | { |
| 463 | int cc; |
| 464 | |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 465 | cc = diag14((unsigned long) buf, devno, 0x00); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 466 | switch (cc) { |
| 467 | case 0: |
| 468 | return 0; |
| 469 | case 1: |
| 470 | return -ENODATA; |
| 471 | case 2: |
| 472 | return -ENOMEDIUM; |
| 473 | default: |
| 474 | return -EIO; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count, |
| 479 | loff_t *offs) |
| 480 | { |
| 481 | size_t len, copied, res; |
| 482 | char *buf; |
| 483 | int rc; |
| 484 | u16 reclen; |
| 485 | struct urdev *urd; |
| 486 | |
| 487 | urd = ((struct urfile *) file->private_data)->urd; |
| 488 | reclen = ((struct urfile *) file->private_data)->file_reclen; |
| 489 | |
| 490 | rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1); |
| 491 | if (rc == -ENODATA) |
| 492 | return 0; |
| 493 | if (rc) |
| 494 | return rc; |
| 495 | |
| 496 | len = min((size_t) PAGE_SIZE, count); |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 497 | buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 498 | if (!buf) |
| 499 | return -ENOMEM; |
| 500 | |
| 501 | copied = 0; |
| 502 | res = (size_t) (*offs % PAGE_SIZE); |
| 503 | do { |
| 504 | rc = diag_read_file(urd->dev_id.devno, buf); |
| 505 | if (rc == -ENODATA) { |
| 506 | break; |
| 507 | } |
| 508 | if (rc) |
| 509 | goto fail; |
Frank Munzert | 2b3d8c9 | 2007-07-27 12:29:17 +0200 | [diff] [blame] | 510 | if (reclen && (copied == 0) && (*offs < PAGE_SIZE)) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 511 | *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen; |
| 512 | len = min(count - copied, PAGE_SIZE - res); |
| 513 | if (copy_to_user(ubuf + copied, buf + res, len)) { |
| 514 | rc = -EFAULT; |
| 515 | goto fail; |
| 516 | } |
| 517 | res = 0; |
| 518 | copied += len; |
| 519 | } while (copied != count); |
| 520 | |
| 521 | *offs += copied; |
| 522 | rc = copied; |
| 523 | fail: |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 524 | free_page((unsigned long) buf); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 525 | return rc; |
| 526 | } |
| 527 | |
| 528 | static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count, |
| 529 | loff_t *offs) |
| 530 | { |
| 531 | struct urdev *urd; |
| 532 | int rc; |
| 533 | |
| 534 | TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs); |
| 535 | |
| 536 | if (count == 0) |
| 537 | return 0; |
| 538 | |
| 539 | urd = ((struct urfile *) file->private_data)->urd; |
| 540 | rc = mutex_lock_interruptible(&urd->io_mutex); |
| 541 | if (rc) |
| 542 | return rc; |
| 543 | rc = diag14_read(file, ubuf, count, offs); |
| 544 | mutex_unlock(&urd->io_mutex); |
| 545 | return rc; |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor |
| 550 | * cc=0 normal completion |
| 551 | * cc=1 no files on reader queue or no subsequent file |
| 552 | * cc=2 spid specified is invalid |
| 553 | */ |
| 554 | static int diag_read_next_file_info(struct file_control_block *buf, int spid) |
| 555 | { |
| 556 | int cc; |
| 557 | |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 558 | cc = diag14((unsigned long) buf, spid, 0xfff); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 559 | switch (cc) { |
| 560 | case 0: |
| 561 | return 0; |
| 562 | default: |
| 563 | return -ENODATA; |
| 564 | } |
| 565 | } |
| 566 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 567 | static int verify_uri_device(struct urdev *urd) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 568 | { |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 569 | struct file_control_block *fcb; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 570 | char *buf; |
| 571 | int rc; |
| 572 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 573 | fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); |
| 574 | if (!fcb) |
| 575 | return -ENOMEM; |
| 576 | |
| 577 | /* check for empty reader device (beginning of chain) */ |
| 578 | rc = diag_read_next_file_info(fcb, 0); |
| 579 | if (rc) |
| 580 | goto fail_free_fcb; |
| 581 | |
| 582 | /* if file is in hold status, we do not read it */ |
| 583 | if (fcb->file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) { |
| 584 | rc = -EPERM; |
| 585 | goto fail_free_fcb; |
| 586 | } |
| 587 | |
| 588 | /* open file on virtual reader */ |
| 589 | buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); |
| 590 | if (!buf) { |
| 591 | rc = -ENOMEM; |
| 592 | goto fail_free_fcb; |
| 593 | } |
| 594 | rc = diag_read_file(urd->dev_id.devno, buf); |
| 595 | if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */ |
| 596 | goto fail_free_buf; |
| 597 | |
| 598 | /* check if the file on top of the queue is open now */ |
| 599 | rc = diag_read_next_file_info(fcb, 0); |
| 600 | if (rc) |
| 601 | goto fail_free_buf; |
| 602 | if (!(fcb->file_stat & FLG_IN_USE)) { |
| 603 | rc = -EMFILE; |
| 604 | goto fail_free_buf; |
| 605 | } |
| 606 | rc = 0; |
| 607 | |
| 608 | fail_free_buf: |
| 609 | free_page((unsigned long) buf); |
| 610 | fail_free_fcb: |
| 611 | kfree(fcb); |
| 612 | return rc; |
| 613 | } |
| 614 | |
| 615 | static int verify_device(struct urdev *urd) |
| 616 | { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 617 | switch (urd->class) { |
| 618 | case DEV_CLASS_UR_O: |
| 619 | return 0; /* no check needed here */ |
| 620 | case DEV_CLASS_UR_I: |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 621 | return verify_uri_device(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 622 | default: |
| 623 | return -ENOTSUPP; |
| 624 | } |
| 625 | } |
| 626 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 627 | static int get_uri_file_reclen(struct urdev *urd) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 628 | { |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 629 | struct file_control_block *fcb; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 630 | int rc; |
| 631 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 632 | fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); |
| 633 | if (!fcb) |
| 634 | return -ENOMEM; |
| 635 | rc = diag_read_next_file_info(fcb, 0); |
| 636 | if (rc) |
| 637 | goto fail_free; |
| 638 | if (fcb->file_stat & FLG_CP_DUMP) |
| 639 | rc = 0; |
| 640 | else |
| 641 | rc = fcb->rec_len; |
| 642 | |
| 643 | fail_free: |
| 644 | kfree(fcb); |
| 645 | return rc; |
| 646 | } |
| 647 | |
| 648 | static int get_file_reclen(struct urdev *urd) |
| 649 | { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 650 | switch (urd->class) { |
| 651 | case DEV_CLASS_UR_O: |
| 652 | return 0; |
| 653 | case DEV_CLASS_UR_I: |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 654 | return get_uri_file_reclen(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 655 | default: |
| 656 | return -ENOTSUPP; |
| 657 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | static int ur_open(struct inode *inode, struct file *file) |
| 661 | { |
| 662 | u16 devno; |
| 663 | struct urdev *urd; |
| 664 | struct urfile *urf; |
| 665 | unsigned short accmode; |
| 666 | int rc; |
| 667 | |
| 668 | accmode = file->f_flags & O_ACCMODE; |
| 669 | |
| 670 | if (accmode == O_RDWR) |
| 671 | return -EACCES; |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame^] | 672 | lock_kernel(); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 673 | /* |
| 674 | * We treat the minor number as the devno of the ur device |
| 675 | * to find in the driver tree. |
| 676 | */ |
| 677 | devno = MINOR(file->f_dentry->d_inode->i_rdev); |
| 678 | |
| 679 | urd = urdev_get_from_devno(devno); |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame^] | 680 | if (!urd) { |
| 681 | rc = -ENXIO; |
| 682 | goto out; |
| 683 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 684 | |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 685 | spin_lock(&urd->open_lock); |
| 686 | while (urd->open_flag) { |
| 687 | spin_unlock(&urd->open_lock); |
| 688 | if (file->f_flags & O_NONBLOCK) { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 689 | rc = -EBUSY; |
| 690 | goto fail_put; |
| 691 | } |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 692 | if (wait_event_interruptible(urd->wait, urd->open_flag == 0)) { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 693 | rc = -ERESTARTSYS; |
| 694 | goto fail_put; |
| 695 | } |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 696 | spin_lock(&urd->open_lock); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 697 | } |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 698 | urd->open_flag++; |
| 699 | spin_unlock(&urd->open_lock); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 700 | |
| 701 | TRACE("ur_open\n"); |
| 702 | |
| 703 | if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) || |
| 704 | ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) { |
| 705 | TRACE("ur_open: unsupported dev class (%d)\n", urd->class); |
| 706 | rc = -EACCES; |
| 707 | goto fail_unlock; |
| 708 | } |
| 709 | |
| 710 | rc = verify_device(urd); |
| 711 | if (rc) |
| 712 | goto fail_unlock; |
| 713 | |
| 714 | urf = urfile_alloc(urd); |
| 715 | if (!urf) { |
| 716 | rc = -ENOMEM; |
| 717 | goto fail_unlock; |
| 718 | } |
| 719 | |
| 720 | urf->dev_reclen = urd->reclen; |
| 721 | rc = get_file_reclen(urd); |
| 722 | if (rc < 0) |
| 723 | goto fail_urfile_free; |
| 724 | urf->file_reclen = rc; |
| 725 | file->private_data = urf; |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame^] | 726 | unlock_kernel(); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 727 | return 0; |
| 728 | |
| 729 | fail_urfile_free: |
| 730 | urfile_free(urf); |
| 731 | fail_unlock: |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 732 | spin_lock(&urd->open_lock); |
| 733 | urd->open_flag--; |
| 734 | spin_unlock(&urd->open_lock); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 735 | fail_put: |
| 736 | urdev_put(urd); |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame^] | 737 | out: |
| 738 | unlock_kernel(); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 739 | return rc; |
| 740 | } |
| 741 | |
| 742 | static int ur_release(struct inode *inode, struct file *file) |
| 743 | { |
| 744 | struct urfile *urf = file->private_data; |
| 745 | |
| 746 | TRACE("ur_release\n"); |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 747 | spin_lock(&urf->urd->open_lock); |
| 748 | urf->urd->open_flag--; |
| 749 | spin_unlock(&urf->urd->open_lock); |
| 750 | wake_up_interruptible(&urf->urd->wait); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 751 | urdev_put(urf->urd); |
| 752 | urfile_free(urf); |
| 753 | return 0; |
| 754 | } |
| 755 | |
| 756 | static loff_t ur_llseek(struct file *file, loff_t offset, int whence) |
| 757 | { |
| 758 | loff_t newpos; |
| 759 | |
| 760 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) |
| 761 | return -ESPIPE; /* seek allowed only for reader */ |
| 762 | if (offset % PAGE_SIZE) |
| 763 | return -ESPIPE; /* only multiples of 4K allowed */ |
| 764 | switch (whence) { |
| 765 | case 0: /* SEEK_SET */ |
| 766 | newpos = offset; |
| 767 | break; |
| 768 | case 1: /* SEEK_CUR */ |
| 769 | newpos = file->f_pos + offset; |
| 770 | break; |
| 771 | default: |
| 772 | return -EINVAL; |
| 773 | } |
| 774 | file->f_pos = newpos; |
| 775 | return newpos; |
| 776 | } |
| 777 | |
Jan Engelhardt | 5c81cdb | 2008-01-26 14:11:29 +0100 | [diff] [blame] | 778 | static const struct file_operations ur_fops = { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 779 | .owner = THIS_MODULE, |
| 780 | .open = ur_open, |
| 781 | .release = ur_release, |
| 782 | .read = ur_read, |
| 783 | .write = ur_write, |
| 784 | .llseek = ur_llseek, |
| 785 | }; |
| 786 | |
| 787 | /* |
| 788 | * ccw_device infrastructure: |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 789 | * ur_probe creates the struct urdev (with refcount = 1), the device |
| 790 | * attributes, sets up the interrupt handler and validates the virtual |
| 791 | * unit record device. |
| 792 | * ur_remove removes the device attributes and drops the reference to |
| 793 | * struct urdev. |
| 794 | * |
| 795 | * ur_probe, ur_remove, ur_set_online and ur_set_offline are serialized |
| 796 | * by the vmur_mutex lock. |
| 797 | * |
| 798 | * urd->char_device is used as indication that the online function has |
| 799 | * been completed successfully. |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 800 | */ |
| 801 | static int ur_probe(struct ccw_device *cdev) |
| 802 | { |
| 803 | struct urdev *urd; |
| 804 | int rc; |
| 805 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 806 | TRACE("ur_probe: cdev=%p\n", cdev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 807 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 808 | mutex_lock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 809 | urd = urdev_alloc(cdev); |
| 810 | if (!urd) { |
| 811 | rc = -ENOMEM; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 812 | goto fail_unlock; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 813 | } |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 814 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 815 | rc = ur_create_attributes(&cdev->dev); |
| 816 | if (rc) { |
| 817 | rc = -ENOMEM; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 818 | goto fail_urdev_put; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 819 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 820 | cdev->handler = ur_int_handler; |
| 821 | |
| 822 | /* validate virtual unit record device */ |
| 823 | urd->class = get_urd_class(urd); |
| 824 | if (urd->class < 0) { |
| 825 | rc = urd->class; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 826 | goto fail_remove_attr; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 827 | } |
| 828 | if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) { |
| 829 | rc = -ENOTSUPP; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 830 | goto fail_remove_attr; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 831 | } |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 832 | spin_lock_irq(get_ccwdev_lock(cdev)); |
| 833 | cdev->dev.driver_data = urd; |
| 834 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 835 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 836 | mutex_unlock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 837 | return 0; |
| 838 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 839 | fail_remove_attr: |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 840 | ur_remove_attributes(&cdev->dev); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 841 | fail_urdev_put: |
| 842 | urdev_put(urd); |
| 843 | fail_unlock: |
| 844 | mutex_unlock(&vmur_mutex); |
| 845 | return rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | static int ur_set_online(struct ccw_device *cdev) |
| 849 | { |
| 850 | struct urdev *urd; |
| 851 | int minor, major, rc; |
| 852 | char node_id[16]; |
| 853 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 854 | TRACE("ur_set_online: cdev=%p\n", cdev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 855 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 856 | mutex_lock(&vmur_mutex); |
| 857 | urd = urdev_get_from_cdev(cdev); |
| 858 | if (!urd) { |
| 859 | /* ur_remove already deleted our urd */ |
| 860 | rc = -ENODEV; |
| 861 | goto fail_unlock; |
| 862 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 863 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 864 | if (urd->char_device) { |
| 865 | /* Another ur_set_online was faster */ |
| 866 | rc = -EBUSY; |
| 867 | goto fail_urdev_put; |
| 868 | } |
| 869 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 870 | minor = urd->dev_id.devno; |
| 871 | major = MAJOR(ur_first_dev_maj_min); |
| 872 | |
| 873 | urd->char_device = cdev_alloc(); |
| 874 | if (!urd->char_device) { |
| 875 | rc = -ENOMEM; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 876 | goto fail_urdev_put; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | cdev_init(urd->char_device, &ur_fops); |
| 880 | urd->char_device->dev = MKDEV(major, minor); |
| 881 | urd->char_device->owner = ur_fops.owner; |
| 882 | |
| 883 | rc = cdev_add(urd->char_device, urd->char_device->dev, 1); |
| 884 | if (rc) |
| 885 | goto fail_free_cdev; |
| 886 | if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) { |
| 887 | if (urd->class == DEV_CLASS_UR_I) |
| 888 | sprintf(node_id, "vmrdr-%s", cdev->dev.bus_id); |
| 889 | if (urd->class == DEV_CLASS_UR_O) |
| 890 | sprintf(node_id, "vmpun-%s", cdev->dev.bus_id); |
| 891 | } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) { |
| 892 | sprintf(node_id, "vmprt-%s", cdev->dev.bus_id); |
| 893 | } else { |
| 894 | rc = -ENOTSUPP; |
| 895 | goto fail_free_cdev; |
| 896 | } |
| 897 | |
| 898 | urd->device = device_create(vmur_class, NULL, urd->char_device->dev, |
| 899 | "%s", node_id); |
| 900 | if (IS_ERR(urd->device)) { |
| 901 | rc = PTR_ERR(urd->device); |
| 902 | TRACE("ur_set_online: device_create rc=%d\n", rc); |
| 903 | goto fail_free_cdev; |
| 904 | } |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 905 | urdev_put(urd); |
| 906 | mutex_unlock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 907 | return 0; |
| 908 | |
| 909 | fail_free_cdev: |
| 910 | cdev_del(urd->char_device); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 911 | urd->char_device = NULL; |
| 912 | fail_urdev_put: |
| 913 | urdev_put(urd); |
| 914 | fail_unlock: |
| 915 | mutex_unlock(&vmur_mutex); |
| 916 | return rc; |
| 917 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 918 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 919 | static int ur_set_offline_force(struct ccw_device *cdev, int force) |
| 920 | { |
| 921 | struct urdev *urd; |
| 922 | int rc; |
| 923 | |
| 924 | TRACE("ur_set_offline: cdev=%p\n", cdev); |
| 925 | urd = urdev_get_from_cdev(cdev); |
| 926 | if (!urd) |
| 927 | /* ur_remove already deleted our urd */ |
| 928 | return -ENODEV; |
| 929 | if (!urd->char_device) { |
| 930 | /* Another ur_set_offline was faster */ |
| 931 | rc = -EBUSY; |
| 932 | goto fail_urdev_put; |
| 933 | } |
| 934 | if (!force && (atomic_read(&urd->ref_count) > 2)) { |
| 935 | /* There is still a user of urd (e.g. ur_open) */ |
| 936 | TRACE("ur_set_offline: BUSY\n"); |
| 937 | rc = -EBUSY; |
| 938 | goto fail_urdev_put; |
| 939 | } |
| 940 | device_destroy(vmur_class, urd->char_device->dev); |
| 941 | cdev_del(urd->char_device); |
| 942 | urd->char_device = NULL; |
| 943 | rc = 0; |
| 944 | |
| 945 | fail_urdev_put: |
| 946 | urdev_put(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 947 | return rc; |
| 948 | } |
| 949 | |
| 950 | static int ur_set_offline(struct ccw_device *cdev) |
| 951 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 952 | int rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 953 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 954 | mutex_lock(&vmur_mutex); |
| 955 | rc = ur_set_offline_force(cdev, 0); |
| 956 | mutex_unlock(&vmur_mutex); |
| 957 | return rc; |
| 958 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 959 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 960 | static void ur_remove(struct ccw_device *cdev) |
| 961 | { |
| 962 | unsigned long flags; |
| 963 | |
| 964 | TRACE("ur_remove\n"); |
| 965 | |
| 966 | mutex_lock(&vmur_mutex); |
| 967 | |
| 968 | if (cdev->online) |
| 969 | ur_set_offline_force(cdev, 1); |
| 970 | ur_remove_attributes(&cdev->dev); |
| 971 | |
| 972 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 973 | urdev_put(cdev->dev.driver_data); |
| 974 | cdev->dev.driver_data = NULL; |
| 975 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 976 | |
| 977 | mutex_unlock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 978 | } |
| 979 | |
| 980 | /* |
| 981 | * Module initialisation and cleanup |
| 982 | */ |
| 983 | static int __init ur_init(void) |
| 984 | { |
| 985 | int rc; |
| 986 | dev_t dev; |
| 987 | |
| 988 | if (!MACHINE_IS_VM) { |
| 989 | PRINT_ERR("%s is only available under z/VM.\n", ur_banner); |
| 990 | return -ENODEV; |
| 991 | } |
| 992 | |
| 993 | vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long)); |
| 994 | if (!vmur_dbf) |
| 995 | return -ENOMEM; |
| 996 | rc = debug_register_view(vmur_dbf, &debug_sprintf_view); |
| 997 | if (rc) |
| 998 | goto fail_free_dbf; |
| 999 | |
| 1000 | debug_set_level(vmur_dbf, 6); |
| 1001 | |
| 1002 | rc = ccw_driver_register(&ur_driver); |
| 1003 | if (rc) |
| 1004 | goto fail_free_dbf; |
| 1005 | |
| 1006 | rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur"); |
| 1007 | if (rc) { |
| 1008 | PRINT_ERR("alloc_chrdev_region failed: err = %d\n", rc); |
| 1009 | goto fail_unregister_driver; |
| 1010 | } |
| 1011 | ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0); |
| 1012 | |
| 1013 | vmur_class = class_create(THIS_MODULE, "vmur"); |
| 1014 | if (IS_ERR(vmur_class)) { |
| 1015 | rc = PTR_ERR(vmur_class); |
| 1016 | goto fail_unregister_region; |
| 1017 | } |
| 1018 | PRINT_INFO("%s loaded.\n", ur_banner); |
| 1019 | return 0; |
| 1020 | |
| 1021 | fail_unregister_region: |
| 1022 | unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); |
| 1023 | fail_unregister_driver: |
| 1024 | ccw_driver_unregister(&ur_driver); |
| 1025 | fail_free_dbf: |
| 1026 | debug_unregister(vmur_dbf); |
| 1027 | return rc; |
| 1028 | } |
| 1029 | |
| 1030 | static void __exit ur_exit(void) |
| 1031 | { |
| 1032 | class_destroy(vmur_class); |
| 1033 | unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); |
| 1034 | ccw_driver_unregister(&ur_driver); |
| 1035 | debug_unregister(vmur_dbf); |
| 1036 | PRINT_INFO("%s unloaded.\n", ur_banner); |
| 1037 | } |
| 1038 | |
| 1039 | module_init(ur_init); |
| 1040 | module_exit(ur_exit); |