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 | * |
Frank Munzert | b241f7b | 2009-06-16 10:30:37 +0200 | [diff] [blame] | 5 | * Copyright IBM Corp. 2001, 2009 |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 6 | * Authors: Malcolm Beattie <beattiem@uk.ibm.com> |
| 7 | * Michael Holzheu <holzheu@de.ibm.com> |
| 8 | * Frank Munzert <munzert@de.ibm.com> |
| 9 | */ |
| 10 | |
Frank Munzert | 80a5c36 | 2008-12-25 13:39:35 +0100 | [diff] [blame] | 11 | #define KMSG_COMPONENT "vmur" |
| 12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 13 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 14 | #include <linux/cdev.h> |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame] | 15 | #include <linux/smp_lock.h> |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 16 | |
| 17 | #include <asm/uaccess.h> |
| 18 | #include <asm/cio.h> |
| 19 | #include <asm/ccwdev.h> |
| 20 | #include <asm/debug.h> |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 21 | #include <asm/diag.h> |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 22 | |
| 23 | #include "vmur.h" |
| 24 | |
| 25 | /* |
| 26 | * Driver overview |
| 27 | * |
| 28 | * Unit record device support is implemented as a character device driver. |
| 29 | * We can fit at least 16 bits into a device minor number and use the |
| 30 | * simple method of mapping a character device number with minor abcd |
| 31 | * to the unit record device with devno abcd. |
| 32 | * I/O to virtual unit record devices is handled as follows: |
| 33 | * Reads: Diagnose code 0x14 (input spool file manipulation) |
| 34 | * is used to read spool data page-wise. |
| 35 | * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length |
| 36 | * is available by reading sysfs attr reclen. Each write() to the device |
| 37 | * must specify an integral multiple (maximal 511) of reclen. |
| 38 | */ |
| 39 | |
| 40 | static char ur_banner[] = "z/VM virtual unit record device driver"; |
| 41 | |
| 42 | MODULE_AUTHOR("IBM Corporation"); |
| 43 | MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver"); |
| 44 | MODULE_LICENSE("GPL"); |
| 45 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 46 | static dev_t ur_first_dev_maj_min; |
| 47 | static struct class *vmur_class; |
| 48 | static struct debug_info *vmur_dbf; |
| 49 | |
| 50 | /* We put the device's record length (for writes) in the driver_info field */ |
| 51 | static struct ccw_device_id ur_ids[] = { |
| 52 | { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) }, |
| 53 | { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) }, |
| 54 | { /* end of list */ } |
| 55 | }; |
| 56 | |
| 57 | MODULE_DEVICE_TABLE(ccw, ur_ids); |
| 58 | |
| 59 | static int ur_probe(struct ccw_device *cdev); |
| 60 | static void ur_remove(struct ccw_device *cdev); |
| 61 | static int ur_set_online(struct ccw_device *cdev); |
| 62 | static int ur_set_offline(struct ccw_device *cdev); |
Frank Munzert | b241f7b | 2009-06-16 10:30:37 +0200 | [diff] [blame] | 63 | static int ur_pm_suspend(struct ccw_device *cdev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 64 | |
| 65 | static struct ccw_driver ur_driver = { |
| 66 | .name = "vmur", |
| 67 | .owner = THIS_MODULE, |
| 68 | .ids = ur_ids, |
| 69 | .probe = ur_probe, |
| 70 | .remove = ur_remove, |
| 71 | .set_online = ur_set_online, |
| 72 | .set_offline = ur_set_offline, |
Frank Munzert | b241f7b | 2009-06-16 10:30:37 +0200 | [diff] [blame] | 73 | .freeze = ur_pm_suspend, |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 74 | }; |
| 75 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 76 | static DEFINE_MUTEX(vmur_mutex); |
| 77 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 78 | /* |
| 79 | * Allocation, freeing, getting and putting of urdev structures |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 80 | * |
| 81 | * Each ur device (urd) contains a reference to its corresponding ccw device |
| 82 | * (cdev) using the urd->cdev pointer. Each ccw device has a reference to the |
Greg Kroah-Hartman | dff59b6 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 83 | * ur device using dev_get_drvdata(&cdev->dev) pointer. |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 84 | * |
| 85 | * urd references: |
| 86 | * - ur_probe gets a urd reference, ur_remove drops the reference |
Greg Kroah-Hartman | dff59b6 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 87 | * dev_get_drvdata(&cdev->dev) |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 88 | * - ur_open gets a urd reference, ur_relase drops the reference |
| 89 | * (urf->urd) |
| 90 | * |
| 91 | * cdev references: |
| 92 | * - urdev_alloc get a cdev reference (urd->cdev) |
| 93 | * - urdev_free drops the cdev reference (urd->cdev) |
| 94 | * |
Greg Kroah-Hartman | dff59b6 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 95 | * Setting and clearing of dev_get_drvdata(&cdev->dev) is protected by the ccwdev lock |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 96 | */ |
| 97 | static struct urdev *urdev_alloc(struct ccw_device *cdev) |
| 98 | { |
| 99 | struct urdev *urd; |
| 100 | |
| 101 | urd = kzalloc(sizeof(struct urdev), GFP_KERNEL); |
| 102 | if (!urd) |
| 103 | return NULL; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 104 | urd->reclen = cdev->id.driver_info; |
| 105 | ccw_device_get_id(cdev, &urd->dev_id); |
| 106 | mutex_init(&urd->io_mutex); |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 107 | init_waitqueue_head(&urd->wait); |
| 108 | spin_lock_init(&urd->open_lock); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 109 | atomic_set(&urd->ref_count, 1); |
| 110 | urd->cdev = cdev; |
| 111 | get_device(&cdev->dev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 112 | return urd; |
| 113 | } |
| 114 | |
| 115 | static void urdev_free(struct urdev *urd) |
| 116 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 117 | TRACE("urdev_free: %p\n", urd); |
| 118 | if (urd->cdev) |
| 119 | put_device(&urd->cdev->dev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 120 | kfree(urd); |
| 121 | } |
| 122 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 123 | static void urdev_get(struct urdev *urd) |
| 124 | { |
| 125 | atomic_inc(&urd->ref_count); |
| 126 | } |
| 127 | |
| 128 | static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev) |
| 129 | { |
| 130 | struct urdev *urd; |
| 131 | unsigned long flags; |
| 132 | |
| 133 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
Greg Kroah-Hartman | dff59b6 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 134 | urd = dev_get_drvdata(&cdev->dev); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 135 | if (urd) |
| 136 | urdev_get(urd); |
| 137 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 138 | return urd; |
| 139 | } |
| 140 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 141 | static struct urdev *urdev_get_from_devno(u16 devno) |
| 142 | { |
| 143 | char bus_id[16]; |
| 144 | struct ccw_device *cdev; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 145 | struct urdev *urd; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 146 | |
| 147 | sprintf(bus_id, "0.0.%04x", devno); |
| 148 | cdev = get_ccwdev_by_busid(&ur_driver, bus_id); |
| 149 | if (!cdev) |
| 150 | return NULL; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 151 | urd = urdev_get_from_cdev(cdev); |
| 152 | put_device(&cdev->dev); |
| 153 | return urd; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | static void urdev_put(struct urdev *urd) |
| 157 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 158 | if (atomic_dec_and_test(&urd->ref_count)) |
| 159 | urdev_free(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | /* |
Frank Munzert | b241f7b | 2009-06-16 10:30:37 +0200 | [diff] [blame] | 163 | * State and contents of ur devices can be changed by class D users issuing |
| 164 | * CP commands such as PURGE or TRANSFER, while the Linux guest is suspended. |
| 165 | * Also the Linux guest might be logged off, which causes all active spool |
| 166 | * files to be closed. |
| 167 | * So we cannot guarantee that spool files are still the same when the Linux |
| 168 | * guest is resumed. In order to avoid unpredictable results at resume time |
| 169 | * we simply refuse to suspend if a ur device node is open. |
| 170 | */ |
| 171 | static int ur_pm_suspend(struct ccw_device *cdev) |
| 172 | { |
| 173 | struct urdev *urd = cdev->dev.driver_data; |
| 174 | |
| 175 | TRACE("ur_pm_suspend: cdev=%p\n", cdev); |
| 176 | if (urd->open_flag) { |
| 177 | pr_err("Unit record device %s is busy, %s refusing to " |
| 178 | "suspend.\n", dev_name(&cdev->dev), ur_banner); |
| 179 | return -EBUSY; |
| 180 | } |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | /* |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 185 | * Low-level functions to do I/O to a ur device. |
| 186 | * alloc_chan_prog |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 187 | * free_chan_prog |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 188 | * do_ur_io |
| 189 | * ur_int_handler |
| 190 | * |
| 191 | * alloc_chan_prog allocates and builds the channel program |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 192 | * free_chan_prog frees memory of the channel program |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 193 | * |
| 194 | * do_ur_io issues the channel program to the device and blocks waiting |
| 195 | * on a completion event it publishes at urd->io_done. The function |
| 196 | * serialises itself on the device's mutex so that only one I/O |
| 197 | * is issued at a time (and that I/O is synchronous). |
| 198 | * |
| 199 | * ur_int_handler catches the "I/O done" interrupt, writes the |
| 200 | * subchannel status word into the scsw member of the urdev structure |
| 201 | * and complete()s the io_done to wake the waiting do_ur_io. |
| 202 | * |
| 203 | * The caller of do_ur_io is responsible for kfree()ing the channel program |
| 204 | * address pointer that alloc_chan_prog returned. |
| 205 | */ |
| 206 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 207 | static void free_chan_prog(struct ccw1 *cpa) |
| 208 | { |
| 209 | struct ccw1 *ptr = cpa; |
| 210 | |
| 211 | while (ptr->cda) { |
| 212 | kfree((void *)(addr_t) ptr->cda); |
| 213 | ptr++; |
| 214 | } |
| 215 | kfree(cpa); |
| 216 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 217 | |
| 218 | /* |
| 219 | * alloc_chan_prog |
| 220 | * The channel program we use is write commands chained together |
| 221 | * with a final NOP CCW command-chained on (which ensures that CE and DE |
| 222 | * are presented together in a single interrupt instead of as separate |
| 223 | * interrupts unless an incorrect length indication kicks in first). The |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 224 | * data length in each CCW is reclen. |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 225 | */ |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 226 | static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count, |
| 227 | int reclen) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 228 | { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 229 | struct ccw1 *cpa; |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 230 | void *kbuf; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 231 | int i; |
| 232 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 233 | TRACE("alloc_chan_prog(%p, %i, %i)\n", ubuf, rec_count, reclen); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 234 | |
| 235 | /* |
| 236 | * We chain a NOP onto the writes to force CE+DE together. |
| 237 | * That means we allocate room for CCWs to cover count/reclen |
| 238 | * records plus a NOP. |
| 239 | */ |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 240 | cpa = kzalloc((rec_count + 1) * sizeof(struct ccw1), |
| 241 | GFP_KERNEL | GFP_DMA); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 242 | if (!cpa) |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 243 | return ERR_PTR(-ENOMEM); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 244 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 245 | for (i = 0; i < rec_count; i++) { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 246 | cpa[i].cmd_code = WRITE_CCW_CMD; |
| 247 | cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI; |
| 248 | cpa[i].count = reclen; |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 249 | kbuf = kmalloc(reclen, GFP_KERNEL | GFP_DMA); |
| 250 | if (!kbuf) { |
| 251 | free_chan_prog(cpa); |
| 252 | return ERR_PTR(-ENOMEM); |
| 253 | } |
| 254 | cpa[i].cda = (u32)(addr_t) kbuf; |
| 255 | if (copy_from_user(kbuf, ubuf, reclen)) { |
| 256 | free_chan_prog(cpa); |
| 257 | return ERR_PTR(-EFAULT); |
| 258 | } |
| 259 | ubuf += reclen; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 260 | } |
| 261 | /* The following NOP CCW forces CE+DE to be presented together */ |
| 262 | cpa[i].cmd_code = CCW_CMD_NOOP; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 263 | return cpa; |
| 264 | } |
| 265 | |
| 266 | static int do_ur_io(struct urdev *urd, struct ccw1 *cpa) |
| 267 | { |
| 268 | int rc; |
| 269 | struct ccw_device *cdev = urd->cdev; |
Heiko Carstens | 278bc68 | 2007-08-10 14:32:31 +0200 | [diff] [blame] | 270 | DECLARE_COMPLETION_ONSTACK(event); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 271 | |
| 272 | TRACE("do_ur_io: cpa=%p\n", cpa); |
| 273 | |
| 274 | rc = mutex_lock_interruptible(&urd->io_mutex); |
| 275 | if (rc) |
| 276 | return rc; |
| 277 | |
| 278 | urd->io_done = &event; |
| 279 | |
| 280 | spin_lock_irq(get_ccwdev_lock(cdev)); |
| 281 | rc = ccw_device_start(cdev, cpa, 1, 0, 0); |
| 282 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
| 283 | |
| 284 | TRACE("do_ur_io: ccw_device_start returned %d\n", rc); |
| 285 | if (rc) |
| 286 | goto out; |
| 287 | |
| 288 | wait_for_completion(&event); |
| 289 | TRACE("do_ur_io: I/O complete\n"); |
| 290 | rc = 0; |
| 291 | |
| 292 | out: |
| 293 | mutex_unlock(&urd->io_mutex); |
| 294 | return rc; |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * ur interrupt handler, called from the ccw_device layer |
| 299 | */ |
| 300 | static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm, |
| 301 | struct irb *irb) |
| 302 | { |
| 303 | struct urdev *urd; |
| 304 | |
| 305 | TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n", |
Peter Oberparleiter | 23d805b | 2008-07-14 09:58:50 +0200 | [diff] [blame] | 306 | intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat, |
| 307 | irb->scsw.cmd.count); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 308 | |
| 309 | if (!intparm) { |
| 310 | TRACE("ur_int_handler: unsolicited interrupt\n"); |
| 311 | return; |
| 312 | } |
Greg Kroah-Hartman | dff59b6 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 313 | urd = dev_get_drvdata(&cdev->dev); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 314 | BUG_ON(!urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 315 | /* On special conditions irb is an error pointer */ |
| 316 | if (IS_ERR(irb)) |
| 317 | urd->io_request_rc = PTR_ERR(irb); |
Peter Oberparleiter | 23d805b | 2008-07-14 09:58:50 +0200 | [diff] [blame] | 318 | else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END)) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 319 | urd->io_request_rc = 0; |
| 320 | else |
| 321 | urd->io_request_rc = -EIO; |
| 322 | |
| 323 | complete(urd->io_done); |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * reclen sysfs attribute - The record length to be used for write CCWs |
| 328 | */ |
| 329 | static ssize_t ur_attr_reclen_show(struct device *dev, |
| 330 | struct device_attribute *attr, char *buf) |
| 331 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 332 | struct urdev *urd; |
| 333 | int rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 334 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 335 | urd = urdev_get_from_cdev(to_ccwdev(dev)); |
| 336 | if (!urd) |
| 337 | return -ENODEV; |
| 338 | rc = sprintf(buf, "%zu\n", urd->reclen); |
| 339 | urdev_put(urd); |
| 340 | return rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 341 | } |
| 342 | |
| 343 | static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL); |
| 344 | |
| 345 | static int ur_create_attributes(struct device *dev) |
| 346 | { |
| 347 | return device_create_file(dev, &dev_attr_reclen); |
| 348 | } |
| 349 | |
| 350 | static void ur_remove_attributes(struct device *dev) |
| 351 | { |
| 352 | device_remove_file(dev, &dev_attr_reclen); |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * diagnose code 0x210 - retrieve device information |
| 357 | * cc=0 normal completion, we have a real device |
| 358 | * cc=1 CP paging error |
| 359 | * cc=2 The virtual device exists, but is not associated with a real device |
| 360 | * cc=3 Invalid device address, or the virtual device does not exist |
| 361 | */ |
| 362 | static int get_urd_class(struct urdev *urd) |
| 363 | { |
| 364 | static struct diag210 ur_diag210; |
| 365 | int cc; |
| 366 | |
| 367 | ur_diag210.vrdcdvno = urd->dev_id.devno; |
| 368 | ur_diag210.vrdclen = sizeof(struct diag210); |
| 369 | |
| 370 | cc = diag210(&ur_diag210); |
| 371 | switch (cc) { |
| 372 | case 0: |
Frank Munzert | b9993a3 | 2008-07-17 17:16:46 +0200 | [diff] [blame] | 373 | return -EOPNOTSUPP; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 374 | case 2: |
| 375 | return ur_diag210.vrdcvcla; /* virtual device class */ |
| 376 | case 3: |
| 377 | return -ENODEV; |
| 378 | default: |
| 379 | return -EIO; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Allocation and freeing of urfile structures |
| 385 | */ |
| 386 | static struct urfile *urfile_alloc(struct urdev *urd) |
| 387 | { |
| 388 | struct urfile *urf; |
| 389 | |
| 390 | urf = kzalloc(sizeof(struct urfile), GFP_KERNEL); |
| 391 | if (!urf) |
| 392 | return NULL; |
| 393 | urf->urd = urd; |
| 394 | |
| 395 | TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf, |
| 396 | urf->dev_reclen); |
| 397 | |
| 398 | return urf; |
| 399 | } |
| 400 | |
| 401 | static void urfile_free(struct urfile *urf) |
| 402 | { |
| 403 | TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd); |
| 404 | kfree(urf); |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * The fops implementation of the character device driver |
| 409 | */ |
| 410 | static ssize_t do_write(struct urdev *urd, const char __user *udata, |
| 411 | size_t count, size_t reclen, loff_t *ppos) |
| 412 | { |
| 413 | struct ccw1 *cpa; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 414 | int rc; |
| 415 | |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 416 | cpa = alloc_chan_prog(udata, count / reclen, reclen); |
| 417 | if (IS_ERR(cpa)) |
| 418 | return PTR_ERR(cpa); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 419 | |
| 420 | rc = do_ur_io(urd, cpa); |
| 421 | if (rc) |
| 422 | goto fail_kfree_cpa; |
| 423 | |
| 424 | if (urd->io_request_rc) { |
| 425 | rc = urd->io_request_rc; |
| 426 | goto fail_kfree_cpa; |
| 427 | } |
| 428 | *ppos += count; |
| 429 | rc = count; |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 430 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 431 | fail_kfree_cpa: |
Michael Holzheu | 1eade38 | 2007-08-10 14:32:30 +0200 | [diff] [blame] | 432 | free_chan_prog(cpa); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 433 | return rc; |
| 434 | } |
| 435 | |
| 436 | static ssize_t ur_write(struct file *file, const char __user *udata, |
| 437 | size_t count, loff_t *ppos) |
| 438 | { |
| 439 | struct urfile *urf = file->private_data; |
| 440 | |
| 441 | TRACE("ur_write: count=%zu\n", count); |
| 442 | |
| 443 | if (count == 0) |
| 444 | return 0; |
| 445 | |
| 446 | if (count % urf->dev_reclen) |
| 447 | return -EINVAL; /* count must be a multiple of reclen */ |
| 448 | |
| 449 | if (count > urf->dev_reclen * MAX_RECS_PER_IO) |
| 450 | count = urf->dev_reclen * MAX_RECS_PER_IO; |
| 451 | |
| 452 | return do_write(urf->urd, udata, count, urf->dev_reclen, ppos); |
| 453 | } |
| 454 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 455 | /* |
| 456 | * diagnose code 0x14 subcode 0x0028 - position spool file to designated |
| 457 | * record |
| 458 | * cc=0 normal completion |
| 459 | * cc=2 no file active on the virtual reader or device not ready |
| 460 | * cc=3 record specified is beyond EOF |
| 461 | */ |
| 462 | static int diag_position_to_record(int devno, int record) |
| 463 | { |
| 464 | int cc; |
| 465 | |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 466 | cc = diag14(record, devno, 0x28); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 467 | switch (cc) { |
| 468 | case 0: |
| 469 | return 0; |
| 470 | case 2: |
| 471 | return -ENOMEDIUM; |
| 472 | case 3: |
| 473 | return -ENODATA; /* position beyond end of file */ |
| 474 | default: |
| 475 | return -EIO; |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * diagnose code 0x14 subcode 0x0000 - read next spool file buffer |
| 481 | * cc=0 normal completion |
| 482 | * cc=1 EOF reached |
| 483 | * cc=2 no file active on the virtual reader, and no file eligible |
| 484 | * cc=3 file already active on the virtual reader or specified virtual |
| 485 | * reader does not exist or is not a reader |
| 486 | */ |
| 487 | static int diag_read_file(int devno, char *buf) |
| 488 | { |
| 489 | int cc; |
| 490 | |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 491 | cc = diag14((unsigned long) buf, devno, 0x00); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 492 | switch (cc) { |
| 493 | case 0: |
| 494 | return 0; |
| 495 | case 1: |
| 496 | return -ENODATA; |
| 497 | case 2: |
| 498 | return -ENOMEDIUM; |
| 499 | default: |
| 500 | return -EIO; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count, |
| 505 | loff_t *offs) |
| 506 | { |
| 507 | size_t len, copied, res; |
| 508 | char *buf; |
| 509 | int rc; |
| 510 | u16 reclen; |
| 511 | struct urdev *urd; |
| 512 | |
| 513 | urd = ((struct urfile *) file->private_data)->urd; |
| 514 | reclen = ((struct urfile *) file->private_data)->file_reclen; |
| 515 | |
| 516 | rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1); |
| 517 | if (rc == -ENODATA) |
| 518 | return 0; |
| 519 | if (rc) |
| 520 | return rc; |
| 521 | |
| 522 | len = min((size_t) PAGE_SIZE, count); |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 523 | buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 524 | if (!buf) |
| 525 | return -ENOMEM; |
| 526 | |
| 527 | copied = 0; |
| 528 | res = (size_t) (*offs % PAGE_SIZE); |
| 529 | do { |
| 530 | rc = diag_read_file(urd->dev_id.devno, buf); |
| 531 | if (rc == -ENODATA) { |
| 532 | break; |
| 533 | } |
| 534 | if (rc) |
| 535 | goto fail; |
Frank Munzert | 2b3d8c9 | 2007-07-27 12:29:17 +0200 | [diff] [blame] | 536 | if (reclen && (copied == 0) && (*offs < PAGE_SIZE)) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 537 | *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen; |
| 538 | len = min(count - copied, PAGE_SIZE - res); |
| 539 | if (copy_to_user(ubuf + copied, buf + res, len)) { |
| 540 | rc = -EFAULT; |
| 541 | goto fail; |
| 542 | } |
| 543 | res = 0; |
| 544 | copied += len; |
| 545 | } while (copied != count); |
| 546 | |
| 547 | *offs += copied; |
| 548 | rc = copied; |
| 549 | fail: |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 550 | free_page((unsigned long) buf); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 551 | return rc; |
| 552 | } |
| 553 | |
| 554 | static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count, |
| 555 | loff_t *offs) |
| 556 | { |
| 557 | struct urdev *urd; |
| 558 | int rc; |
| 559 | |
| 560 | TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs); |
| 561 | |
| 562 | if (count == 0) |
| 563 | return 0; |
| 564 | |
| 565 | urd = ((struct urfile *) file->private_data)->urd; |
| 566 | rc = mutex_lock_interruptible(&urd->io_mutex); |
| 567 | if (rc) |
| 568 | return rc; |
| 569 | rc = diag14_read(file, ubuf, count, offs); |
| 570 | mutex_unlock(&urd->io_mutex); |
| 571 | return rc; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor |
| 576 | * cc=0 normal completion |
| 577 | * cc=1 no files on reader queue or no subsequent file |
| 578 | * cc=2 spid specified is invalid |
| 579 | */ |
| 580 | static int diag_read_next_file_info(struct file_control_block *buf, int spid) |
| 581 | { |
| 582 | int cc; |
| 583 | |
Michael Holzheu | 0a87c5c | 2007-08-22 13:51:40 +0200 | [diff] [blame] | 584 | cc = diag14((unsigned long) buf, spid, 0xfff); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 585 | switch (cc) { |
| 586 | case 0: |
| 587 | return 0; |
| 588 | default: |
| 589 | return -ENODATA; |
| 590 | } |
| 591 | } |
| 592 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 593 | static int verify_uri_device(struct urdev *urd) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 594 | { |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 595 | struct file_control_block *fcb; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 596 | char *buf; |
| 597 | int rc; |
| 598 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 599 | fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); |
| 600 | if (!fcb) |
| 601 | return -ENOMEM; |
| 602 | |
| 603 | /* check for empty reader device (beginning of chain) */ |
| 604 | rc = diag_read_next_file_info(fcb, 0); |
| 605 | if (rc) |
| 606 | goto fail_free_fcb; |
| 607 | |
| 608 | /* if file is in hold status, we do not read it */ |
| 609 | if (fcb->file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) { |
| 610 | rc = -EPERM; |
| 611 | goto fail_free_fcb; |
| 612 | } |
| 613 | |
| 614 | /* open file on virtual reader */ |
| 615 | buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); |
| 616 | if (!buf) { |
| 617 | rc = -ENOMEM; |
| 618 | goto fail_free_fcb; |
| 619 | } |
| 620 | rc = diag_read_file(urd->dev_id.devno, buf); |
| 621 | if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */ |
| 622 | goto fail_free_buf; |
| 623 | |
| 624 | /* check if the file on top of the queue is open now */ |
| 625 | rc = diag_read_next_file_info(fcb, 0); |
| 626 | if (rc) |
| 627 | goto fail_free_buf; |
| 628 | if (!(fcb->file_stat & FLG_IN_USE)) { |
| 629 | rc = -EMFILE; |
| 630 | goto fail_free_buf; |
| 631 | } |
| 632 | rc = 0; |
| 633 | |
| 634 | fail_free_buf: |
| 635 | free_page((unsigned long) buf); |
| 636 | fail_free_fcb: |
| 637 | kfree(fcb); |
| 638 | return rc; |
| 639 | } |
| 640 | |
| 641 | static int verify_device(struct urdev *urd) |
| 642 | { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 643 | switch (urd->class) { |
| 644 | case DEV_CLASS_UR_O: |
| 645 | return 0; /* no check needed here */ |
| 646 | case DEV_CLASS_UR_I: |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 647 | return verify_uri_device(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 648 | default: |
Frank Munzert | b9993a3 | 2008-07-17 17:16:46 +0200 | [diff] [blame] | 649 | return -EOPNOTSUPP; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 650 | } |
| 651 | } |
| 652 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 653 | static int get_uri_file_reclen(struct urdev *urd) |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 654 | { |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 655 | struct file_control_block *fcb; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 656 | int rc; |
| 657 | |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 658 | fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); |
| 659 | if (!fcb) |
| 660 | return -ENOMEM; |
| 661 | rc = diag_read_next_file_info(fcb, 0); |
| 662 | if (rc) |
| 663 | goto fail_free; |
| 664 | if (fcb->file_stat & FLG_CP_DUMP) |
| 665 | rc = 0; |
| 666 | else |
| 667 | rc = fcb->rec_len; |
| 668 | |
| 669 | fail_free: |
| 670 | kfree(fcb); |
| 671 | return rc; |
| 672 | } |
| 673 | |
| 674 | static int get_file_reclen(struct urdev *urd) |
| 675 | { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 676 | switch (urd->class) { |
| 677 | case DEV_CLASS_UR_O: |
| 678 | return 0; |
| 679 | case DEV_CLASS_UR_I: |
Michael Holzheu | 3eed13c | 2007-08-10 14:32:34 +0200 | [diff] [blame] | 680 | return get_uri_file_reclen(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 681 | default: |
Frank Munzert | b9993a3 | 2008-07-17 17:16:46 +0200 | [diff] [blame] | 682 | return -EOPNOTSUPP; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 683 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | static int ur_open(struct inode *inode, struct file *file) |
| 687 | { |
| 688 | u16 devno; |
| 689 | struct urdev *urd; |
| 690 | struct urfile *urf; |
| 691 | unsigned short accmode; |
| 692 | int rc; |
| 693 | |
| 694 | accmode = file->f_flags & O_ACCMODE; |
| 695 | |
| 696 | if (accmode == O_RDWR) |
| 697 | return -EACCES; |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame] | 698 | lock_kernel(); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 699 | /* |
| 700 | * We treat the minor number as the devno of the ur device |
| 701 | * to find in the driver tree. |
| 702 | */ |
| 703 | devno = MINOR(file->f_dentry->d_inode->i_rdev); |
| 704 | |
| 705 | urd = urdev_get_from_devno(devno); |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame] | 706 | if (!urd) { |
| 707 | rc = -ENXIO; |
| 708 | goto out; |
| 709 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 710 | |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 711 | spin_lock(&urd->open_lock); |
| 712 | while (urd->open_flag) { |
| 713 | spin_unlock(&urd->open_lock); |
| 714 | if (file->f_flags & O_NONBLOCK) { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 715 | rc = -EBUSY; |
| 716 | goto fail_put; |
| 717 | } |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 718 | if (wait_event_interruptible(urd->wait, urd->open_flag == 0)) { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 719 | rc = -ERESTARTSYS; |
| 720 | goto fail_put; |
| 721 | } |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 722 | spin_lock(&urd->open_lock); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 723 | } |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 724 | urd->open_flag++; |
| 725 | spin_unlock(&urd->open_lock); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 726 | |
| 727 | TRACE("ur_open\n"); |
| 728 | |
| 729 | if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) || |
| 730 | ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) { |
| 731 | TRACE("ur_open: unsupported dev class (%d)\n", urd->class); |
| 732 | rc = -EACCES; |
| 733 | goto fail_unlock; |
| 734 | } |
| 735 | |
| 736 | rc = verify_device(urd); |
| 737 | if (rc) |
| 738 | goto fail_unlock; |
| 739 | |
| 740 | urf = urfile_alloc(urd); |
| 741 | if (!urf) { |
| 742 | rc = -ENOMEM; |
| 743 | goto fail_unlock; |
| 744 | } |
| 745 | |
| 746 | urf->dev_reclen = urd->reclen; |
| 747 | rc = get_file_reclen(urd); |
| 748 | if (rc < 0) |
| 749 | goto fail_urfile_free; |
| 750 | urf->file_reclen = rc; |
| 751 | file->private_data = urf; |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame] | 752 | unlock_kernel(); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 753 | return 0; |
| 754 | |
| 755 | fail_urfile_free: |
| 756 | urfile_free(urf); |
| 757 | fail_unlock: |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 758 | spin_lock(&urd->open_lock); |
| 759 | urd->open_flag--; |
| 760 | spin_unlock(&urd->open_lock); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 761 | fail_put: |
| 762 | urdev_put(urd); |
Jonathan Corbet | 764a4a8 | 2008-05-15 10:01:17 -0600 | [diff] [blame] | 763 | out: |
| 764 | unlock_kernel(); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 765 | return rc; |
| 766 | } |
| 767 | |
| 768 | static int ur_release(struct inode *inode, struct file *file) |
| 769 | { |
| 770 | struct urfile *urf = file->private_data; |
| 771 | |
| 772 | TRACE("ur_release\n"); |
Frank Munzert | a695f16 | 2008-04-17 07:46:06 +0200 | [diff] [blame] | 773 | spin_lock(&urf->urd->open_lock); |
| 774 | urf->urd->open_flag--; |
| 775 | spin_unlock(&urf->urd->open_lock); |
| 776 | wake_up_interruptible(&urf->urd->wait); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 777 | urdev_put(urf->urd); |
| 778 | urfile_free(urf); |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | static loff_t ur_llseek(struct file *file, loff_t offset, int whence) |
| 783 | { |
| 784 | loff_t newpos; |
| 785 | |
| 786 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) |
| 787 | return -ESPIPE; /* seek allowed only for reader */ |
| 788 | if (offset % PAGE_SIZE) |
| 789 | return -ESPIPE; /* only multiples of 4K allowed */ |
| 790 | switch (whence) { |
| 791 | case 0: /* SEEK_SET */ |
| 792 | newpos = offset; |
| 793 | break; |
| 794 | case 1: /* SEEK_CUR */ |
| 795 | newpos = file->f_pos + offset; |
| 796 | break; |
| 797 | default: |
| 798 | return -EINVAL; |
| 799 | } |
| 800 | file->f_pos = newpos; |
| 801 | return newpos; |
| 802 | } |
| 803 | |
Jan Engelhardt | 5c81cdb | 2008-01-26 14:11:29 +0100 | [diff] [blame] | 804 | static const struct file_operations ur_fops = { |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 805 | .owner = THIS_MODULE, |
| 806 | .open = ur_open, |
| 807 | .release = ur_release, |
| 808 | .read = ur_read, |
| 809 | .write = ur_write, |
| 810 | .llseek = ur_llseek, |
| 811 | }; |
| 812 | |
| 813 | /* |
| 814 | * ccw_device infrastructure: |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 815 | * ur_probe creates the struct urdev (with refcount = 1), the device |
| 816 | * attributes, sets up the interrupt handler and validates the virtual |
| 817 | * unit record device. |
| 818 | * ur_remove removes the device attributes and drops the reference to |
| 819 | * struct urdev. |
| 820 | * |
| 821 | * ur_probe, ur_remove, ur_set_online and ur_set_offline are serialized |
| 822 | * by the vmur_mutex lock. |
| 823 | * |
| 824 | * urd->char_device is used as indication that the online function has |
| 825 | * been completed successfully. |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 826 | */ |
| 827 | static int ur_probe(struct ccw_device *cdev) |
| 828 | { |
| 829 | struct urdev *urd; |
| 830 | int rc; |
| 831 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 832 | TRACE("ur_probe: cdev=%p\n", cdev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 833 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 834 | mutex_lock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 835 | urd = urdev_alloc(cdev); |
| 836 | if (!urd) { |
| 837 | rc = -ENOMEM; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 838 | goto fail_unlock; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 839 | } |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 840 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 841 | rc = ur_create_attributes(&cdev->dev); |
| 842 | if (rc) { |
| 843 | rc = -ENOMEM; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 844 | goto fail_urdev_put; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 845 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 846 | cdev->handler = ur_int_handler; |
| 847 | |
| 848 | /* validate virtual unit record device */ |
| 849 | urd->class = get_urd_class(urd); |
| 850 | if (urd->class < 0) { |
| 851 | rc = urd->class; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 852 | goto fail_remove_attr; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 853 | } |
| 854 | if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) { |
Frank Munzert | b9993a3 | 2008-07-17 17:16:46 +0200 | [diff] [blame] | 855 | rc = -EOPNOTSUPP; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 856 | goto fail_remove_attr; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 857 | } |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 858 | spin_lock_irq(get_ccwdev_lock(cdev)); |
Greg Kroah-Hartman | dff59b6 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 859 | dev_set_drvdata(&cdev->dev, urd); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 860 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 861 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 862 | mutex_unlock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 863 | return 0; |
| 864 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 865 | fail_remove_attr: |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 866 | ur_remove_attributes(&cdev->dev); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 867 | fail_urdev_put: |
| 868 | urdev_put(urd); |
| 869 | fail_unlock: |
| 870 | mutex_unlock(&vmur_mutex); |
| 871 | return rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 872 | } |
| 873 | |
| 874 | static int ur_set_online(struct ccw_device *cdev) |
| 875 | { |
| 876 | struct urdev *urd; |
| 877 | int minor, major, rc; |
| 878 | char node_id[16]; |
| 879 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 880 | TRACE("ur_set_online: cdev=%p\n", cdev); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 881 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 882 | mutex_lock(&vmur_mutex); |
| 883 | urd = urdev_get_from_cdev(cdev); |
| 884 | if (!urd) { |
| 885 | /* ur_remove already deleted our urd */ |
| 886 | rc = -ENODEV; |
| 887 | goto fail_unlock; |
| 888 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 889 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 890 | if (urd->char_device) { |
| 891 | /* Another ur_set_online was faster */ |
| 892 | rc = -EBUSY; |
| 893 | goto fail_urdev_put; |
| 894 | } |
| 895 | |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 896 | minor = urd->dev_id.devno; |
| 897 | major = MAJOR(ur_first_dev_maj_min); |
| 898 | |
| 899 | urd->char_device = cdev_alloc(); |
| 900 | if (!urd->char_device) { |
| 901 | rc = -ENOMEM; |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 902 | goto fail_urdev_put; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 903 | } |
| 904 | |
| 905 | cdev_init(urd->char_device, &ur_fops); |
| 906 | urd->char_device->dev = MKDEV(major, minor); |
| 907 | urd->char_device->owner = ur_fops.owner; |
| 908 | |
| 909 | rc = cdev_add(urd->char_device, urd->char_device->dev, 1); |
| 910 | if (rc) |
| 911 | goto fail_free_cdev; |
| 912 | if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) { |
| 913 | if (urd->class == DEV_CLASS_UR_I) |
Kay Sievers | 2a0217d | 2008-10-10 21:33:09 +0200 | [diff] [blame] | 914 | sprintf(node_id, "vmrdr-%s", dev_name(&cdev->dev)); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 915 | if (urd->class == DEV_CLASS_UR_O) |
Kay Sievers | 2a0217d | 2008-10-10 21:33:09 +0200 | [diff] [blame] | 916 | sprintf(node_id, "vmpun-%s", dev_name(&cdev->dev)); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 917 | } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) { |
Kay Sievers | 2a0217d | 2008-10-10 21:33:09 +0200 | [diff] [blame] | 918 | sprintf(node_id, "vmprt-%s", dev_name(&cdev->dev)); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 919 | } else { |
Frank Munzert | b9993a3 | 2008-07-17 17:16:46 +0200 | [diff] [blame] | 920 | rc = -EOPNOTSUPP; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 921 | goto fail_free_cdev; |
| 922 | } |
| 923 | |
Greg Kroah-Hartman | ea9e42f | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 924 | urd->device = device_create(vmur_class, NULL, urd->char_device->dev, |
| 925 | NULL, "%s", node_id); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 926 | if (IS_ERR(urd->device)) { |
| 927 | rc = PTR_ERR(urd->device); |
| 928 | TRACE("ur_set_online: device_create rc=%d\n", rc); |
| 929 | goto fail_free_cdev; |
| 930 | } |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 931 | urdev_put(urd); |
| 932 | mutex_unlock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 933 | return 0; |
| 934 | |
| 935 | fail_free_cdev: |
| 936 | cdev_del(urd->char_device); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 937 | urd->char_device = NULL; |
| 938 | fail_urdev_put: |
| 939 | urdev_put(urd); |
| 940 | fail_unlock: |
| 941 | mutex_unlock(&vmur_mutex); |
| 942 | return rc; |
| 943 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 944 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 945 | static int ur_set_offline_force(struct ccw_device *cdev, int force) |
| 946 | { |
| 947 | struct urdev *urd; |
| 948 | int rc; |
| 949 | |
| 950 | TRACE("ur_set_offline: cdev=%p\n", cdev); |
| 951 | urd = urdev_get_from_cdev(cdev); |
| 952 | if (!urd) |
| 953 | /* ur_remove already deleted our urd */ |
| 954 | return -ENODEV; |
| 955 | if (!urd->char_device) { |
| 956 | /* Another ur_set_offline was faster */ |
| 957 | rc = -EBUSY; |
| 958 | goto fail_urdev_put; |
| 959 | } |
| 960 | if (!force && (atomic_read(&urd->ref_count) > 2)) { |
| 961 | /* There is still a user of urd (e.g. ur_open) */ |
| 962 | TRACE("ur_set_offline: BUSY\n"); |
| 963 | rc = -EBUSY; |
| 964 | goto fail_urdev_put; |
| 965 | } |
| 966 | device_destroy(vmur_class, urd->char_device->dev); |
| 967 | cdev_del(urd->char_device); |
| 968 | urd->char_device = NULL; |
| 969 | rc = 0; |
| 970 | |
| 971 | fail_urdev_put: |
| 972 | urdev_put(urd); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 973 | return rc; |
| 974 | } |
| 975 | |
| 976 | static int ur_set_offline(struct ccw_device *cdev) |
| 977 | { |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 978 | int rc; |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 979 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 980 | mutex_lock(&vmur_mutex); |
| 981 | rc = ur_set_offline_force(cdev, 0); |
| 982 | mutex_unlock(&vmur_mutex); |
| 983 | return rc; |
| 984 | } |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 985 | |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 986 | static void ur_remove(struct ccw_device *cdev) |
| 987 | { |
| 988 | unsigned long flags; |
| 989 | |
| 990 | TRACE("ur_remove\n"); |
| 991 | |
| 992 | mutex_lock(&vmur_mutex); |
| 993 | |
| 994 | if (cdev->online) |
| 995 | ur_set_offline_force(cdev, 1); |
| 996 | ur_remove_attributes(&cdev->dev); |
| 997 | |
| 998 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
Greg Kroah-Hartman | dff59b6 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 999 | urdev_put(dev_get_drvdata(&cdev->dev)); |
| 1000 | dev_set_drvdata(&cdev->dev, NULL); |
Michael Holzheu | 8127a1f | 2007-08-22 13:51:41 +0200 | [diff] [blame] | 1001 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1002 | |
| 1003 | mutex_unlock(&vmur_mutex); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 1004 | } |
| 1005 | |
| 1006 | /* |
| 1007 | * Module initialisation and cleanup |
| 1008 | */ |
| 1009 | static int __init ur_init(void) |
| 1010 | { |
| 1011 | int rc; |
| 1012 | dev_t dev; |
| 1013 | |
| 1014 | if (!MACHINE_IS_VM) { |
Frank Munzert | 80a5c36 | 2008-12-25 13:39:35 +0100 | [diff] [blame] | 1015 | pr_err("The %s cannot be loaded without z/VM\n", |
| 1016 | ur_banner); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 1017 | return -ENODEV; |
| 1018 | } |
| 1019 | |
| 1020 | vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long)); |
| 1021 | if (!vmur_dbf) |
| 1022 | return -ENOMEM; |
| 1023 | rc = debug_register_view(vmur_dbf, &debug_sprintf_view); |
| 1024 | if (rc) |
| 1025 | goto fail_free_dbf; |
| 1026 | |
| 1027 | debug_set_level(vmur_dbf, 6); |
| 1028 | |
| 1029 | rc = ccw_driver_register(&ur_driver); |
| 1030 | if (rc) |
| 1031 | goto fail_free_dbf; |
| 1032 | |
| 1033 | rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur"); |
| 1034 | if (rc) { |
Frank Munzert | 80a5c36 | 2008-12-25 13:39:35 +0100 | [diff] [blame] | 1035 | pr_err("Kernel function alloc_chrdev_region failed with " |
| 1036 | "error code %d\n", rc); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 1037 | goto fail_unregister_driver; |
| 1038 | } |
| 1039 | ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0); |
| 1040 | |
| 1041 | vmur_class = class_create(THIS_MODULE, "vmur"); |
| 1042 | if (IS_ERR(vmur_class)) { |
| 1043 | rc = PTR_ERR(vmur_class); |
| 1044 | goto fail_unregister_region; |
| 1045 | } |
Frank Munzert | 80a5c36 | 2008-12-25 13:39:35 +0100 | [diff] [blame] | 1046 | pr_info("%s loaded.\n", ur_banner); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 1047 | return 0; |
| 1048 | |
| 1049 | fail_unregister_region: |
| 1050 | unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); |
| 1051 | fail_unregister_driver: |
| 1052 | ccw_driver_unregister(&ur_driver); |
| 1053 | fail_free_dbf: |
| 1054 | debug_unregister(vmur_dbf); |
| 1055 | return rc; |
| 1056 | } |
| 1057 | |
| 1058 | static void __exit ur_exit(void) |
| 1059 | { |
| 1060 | class_destroy(vmur_class); |
| 1061 | unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); |
| 1062 | ccw_driver_unregister(&ur_driver); |
| 1063 | debug_unregister(vmur_dbf); |
Frank Munzert | 80a5c36 | 2008-12-25 13:39:35 +0100 | [diff] [blame] | 1064 | pr_info("%s unloaded.\n", ur_banner); |
Frank Munzert | 810cb5b | 2007-07-17 13:36:06 +0200 | [diff] [blame] | 1065 | } |
| 1066 | |
| 1067 | module_init(ur_init); |
| 1068 | module_exit(ur_exit); |