Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File...........: linux/drivers/s390/block/dasd.c |
| 3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
| 4 | * Horst Hummel <Horst.Hummel@de.ibm.com> |
| 5 | * Carsten Otte <Cotte@de.ibm.com> |
| 6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| 7 | * Bugreports.to..: <Linux390@de.ibm.com> |
| 8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 |
| 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kmod.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/ctype.h> |
| 16 | #include <linux/major.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/buffer_head.h> |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 19 | #include <linux/hdreg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | #include <asm/ccwdev.h> |
| 22 | #include <asm/ebcdic.h> |
| 23 | #include <asm/idals.h> |
| 24 | #include <asm/todclk.h> |
| 25 | |
| 26 | /* This is ugly... */ |
| 27 | #define PRINTK_HEADER "dasd:" |
| 28 | |
| 29 | #include "dasd_int.h" |
| 30 | /* |
| 31 | * SECTION: Constant definitions to be used within this file |
| 32 | */ |
| 33 | #define DASD_CHANQ_MAX_SIZE 4 |
| 34 | |
| 35 | /* |
| 36 | * SECTION: exported variables of dasd.c |
| 37 | */ |
| 38 | debug_info_t *dasd_debug_area; |
| 39 | struct dasd_discipline *dasd_diag_discipline_pointer; |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 40 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); |
| 43 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," |
| 44 | " Copyright 2000 IBM Corporation"); |
| 45 | MODULE_SUPPORTED_DEVICE("dasd"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | MODULE_LICENSE("GPL"); |
| 47 | |
| 48 | /* |
| 49 | * SECTION: prototypes for static functions of dasd.c |
| 50 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 51 | static int dasd_alloc_queue(struct dasd_block *); |
| 52 | static void dasd_setup_queue(struct dasd_block *); |
| 53 | static void dasd_free_queue(struct dasd_block *); |
| 54 | static void dasd_flush_request_queue(struct dasd_block *); |
| 55 | static int dasd_flush_block_queue(struct dasd_block *); |
| 56 | static void dasd_device_tasklet(struct dasd_device *); |
| 57 | static void dasd_block_tasklet(struct dasd_block *); |
Al Viro | 4927b3f | 2006-12-06 19:18:20 +0000 | [diff] [blame] | 58 | static void do_kick_device(struct work_struct *); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 59 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | /* |
| 62 | * SECTION: Operations on the device structure. |
| 63 | */ |
| 64 | static wait_queue_head_t dasd_init_waitq; |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 65 | static wait_queue_head_t dasd_flush_wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | /* |
| 68 | * Allocate memory for a new device structure. |
| 69 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 70 | struct dasd_device *dasd_alloc_device(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | { |
| 72 | struct dasd_device *device; |
| 73 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 74 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
| 75 | if (!device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | /* Get two pages for normal block device operations. */ |
| 79 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 80 | if (!device->ccw_mem) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | kfree(device); |
| 82 | return ERR_PTR(-ENOMEM); |
| 83 | } |
| 84 | /* Get one page for error recovery. */ |
| 85 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 86 | if (!device->erp_mem) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | free_pages((unsigned long) device->ccw_mem, 1); |
| 88 | kfree(device); |
| 89 | return ERR_PTR(-ENOMEM); |
| 90 | } |
| 91 | |
| 92 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); |
| 93 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); |
| 94 | spin_lock_init(&device->mem_lock); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 95 | atomic_set(&device->tasklet_scheduled, 0); |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 96 | tasklet_init(&device->tasklet, |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 97 | (void (*)(unsigned long)) dasd_device_tasklet, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | (unsigned long) device); |
| 99 | INIT_LIST_HEAD(&device->ccw_queue); |
| 100 | init_timer(&device->timer); |
Al Viro | 4927b3f | 2006-12-06 19:18:20 +0000 | [diff] [blame] | 101 | INIT_WORK(&device->kick_work, do_kick_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | device->state = DASD_STATE_NEW; |
| 103 | device->target = DASD_STATE_NEW; |
| 104 | |
| 105 | return device; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * Free memory of a device structure. |
| 110 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 111 | void dasd_free_device(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
Jesper Juhl | 17fd682 | 2005-11-07 01:01:30 -0800 | [diff] [blame] | 113 | kfree(device->private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | free_page((unsigned long) device->erp_mem); |
| 115 | free_pages((unsigned long) device->ccw_mem, 1); |
| 116 | kfree(device); |
| 117 | } |
| 118 | |
| 119 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 120 | * Allocate memory for a new device structure. |
| 121 | */ |
| 122 | struct dasd_block *dasd_alloc_block(void) |
| 123 | { |
| 124 | struct dasd_block *block; |
| 125 | |
| 126 | block = kzalloc(sizeof(*block), GFP_ATOMIC); |
| 127 | if (!block) |
| 128 | return ERR_PTR(-ENOMEM); |
| 129 | /* open_count = 0 means device online but not in use */ |
| 130 | atomic_set(&block->open_count, -1); |
| 131 | |
| 132 | spin_lock_init(&block->request_queue_lock); |
| 133 | atomic_set(&block->tasklet_scheduled, 0); |
| 134 | tasklet_init(&block->tasklet, |
| 135 | (void (*)(unsigned long)) dasd_block_tasklet, |
| 136 | (unsigned long) block); |
| 137 | INIT_LIST_HEAD(&block->ccw_queue); |
| 138 | spin_lock_init(&block->queue_lock); |
| 139 | init_timer(&block->timer); |
| 140 | |
| 141 | return block; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Free memory of a device structure. |
| 146 | */ |
| 147 | void dasd_free_block(struct dasd_block *block) |
| 148 | { |
| 149 | kfree(block); |
| 150 | } |
| 151 | |
| 152 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | * Make a new device known to the system. |
| 154 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 155 | static int dasd_state_new_to_known(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
| 157 | int rc; |
| 158 | |
| 159 | /* |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 160 | * As long as the device is not in state DASD_STATE_NEW we want to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | * keep the reference count > 0. |
| 162 | */ |
| 163 | dasd_get_device(device); |
| 164 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 165 | if (device->block) { |
| 166 | rc = dasd_alloc_queue(device->block); |
| 167 | if (rc) { |
| 168 | dasd_put_device(device); |
| 169 | return rc; |
| 170 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | device->state = DASD_STATE_KNOWN; |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Let the system forget about a device. |
| 178 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 179 | static int dasd_state_known_to_new(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 181 | /* Disable extended error reporting for this device. */ |
| 182 | dasd_eer_disable(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | /* Forget the discipline information. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 184 | if (device->discipline) { |
| 185 | if (device->discipline->uncheck_device) |
| 186 | device->discipline->uncheck_device(device); |
Peter Oberparleiter | aa88861 | 2006-02-20 18:28:13 -0800 | [diff] [blame] | 187 | module_put(device->discipline->owner); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | device->discipline = NULL; |
Peter Oberparleiter | aa88861 | 2006-02-20 18:28:13 -0800 | [diff] [blame] | 190 | if (device->base_discipline) |
| 191 | module_put(device->base_discipline->owner); |
| 192 | device->base_discipline = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | device->state = DASD_STATE_NEW; |
| 194 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 195 | if (device->block) |
| 196 | dasd_free_queue(device->block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | /* Give up reference we took in dasd_state_new_to_known. */ |
| 199 | dasd_put_device(device); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 200 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Request the irq line for the device. |
| 205 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 206 | static int dasd_state_known_to_basic(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | { |
| 208 | int rc; |
| 209 | |
| 210 | /* Allocate and register gendisk structure. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 211 | if (device->block) { |
| 212 | rc = dasd_gendisk_alloc(device->block); |
| 213 | if (rc) |
| 214 | return rc; |
| 215 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 217 | device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2, |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 218 | 8 * sizeof(long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | debug_register_view(device->debug_area, &debug_sprintf_view); |
Horst Hummel | b0035f1 | 2006-09-20 15:59:07 +0200 | [diff] [blame] | 220 | debug_set_level(device->debug_area, DBF_WARNING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
| 222 | |
| 223 | device->state = DASD_STATE_BASIC; |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * Release the irq line for the device. Terminate any running i/o. |
| 229 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 230 | static int dasd_state_basic_to_known(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 232 | int rc; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 233 | if (device->block) { |
| 234 | dasd_gendisk_free(device->block); |
| 235 | dasd_block_clear_timer(device->block); |
| 236 | } |
| 237 | rc = dasd_flush_device_queue(device); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 238 | if (rc) |
| 239 | return rc; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 240 | dasd_device_clear_timer(device); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
| 243 | if (device->debug_area != NULL) { |
| 244 | debug_unregister(device->debug_area); |
| 245 | device->debug_area = NULL; |
| 246 | } |
| 247 | device->state = DASD_STATE_KNOWN; |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 248 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | /* |
| 252 | * Do the initial analysis. The do_analysis function may return |
| 253 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC |
| 254 | * until the discipline decides to continue the startup sequence |
| 255 | * by calling the function dasd_change_state. The eckd disciplines |
| 256 | * uses this to start a ccw that detects the format. The completion |
| 257 | * interrupt for this detection ccw uses the kernel event daemon to |
| 258 | * trigger the call to dasd_change_state. All this is done in the |
| 259 | * discipline code, see dasd_eckd.c. |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 260 | * After the analysis ccw is done (do_analysis returned 0) the block |
| 261 | * device is setup. |
| 262 | * In case the analysis returns an error, the device setup is stopped |
| 263 | * (a fake disk was already added to allow formatting). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 265 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | { |
| 267 | int rc; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 268 | struct dasd_block *block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | rc = 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 271 | block = device->block; |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 272 | /* make disk known with correct capacity */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 273 | if (block) { |
| 274 | if (block->base->discipline->do_analysis != NULL) |
| 275 | rc = block->base->discipline->do_analysis(block); |
| 276 | if (rc) { |
| 277 | if (rc != -EAGAIN) |
| 278 | device->state = DASD_STATE_UNFMT; |
| 279 | return rc; |
| 280 | } |
| 281 | dasd_setup_queue(block); |
| 282 | set_capacity(block->gdp, |
| 283 | block->blocks << block->s2b_shift); |
| 284 | device->state = DASD_STATE_READY; |
| 285 | rc = dasd_scan_partitions(block); |
| 286 | if (rc) |
| 287 | device->state = DASD_STATE_BASIC; |
| 288 | } else { |
| 289 | device->state = DASD_STATE_READY; |
| 290 | } |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 291 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | /* |
| 295 | * Remove device from block device layer. Destroy dirty buffers. |
| 296 | * Forget format information. Check if the target level is basic |
| 297 | * and if it is create fake disk for formatting. |
| 298 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 299 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | { |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 301 | int rc; |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | device->state = DASD_STATE_BASIC; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 304 | if (device->block) { |
| 305 | struct dasd_block *block = device->block; |
| 306 | rc = dasd_flush_block_queue(block); |
| 307 | if (rc) { |
| 308 | device->state = DASD_STATE_READY; |
| 309 | return rc; |
| 310 | } |
| 311 | dasd_destroy_partitions(block); |
| 312 | dasd_flush_request_queue(block); |
| 313 | block->blocks = 0; |
| 314 | block->bp_block = 0; |
| 315 | block->s2b_shift = 0; |
| 316 | } |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 317 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | /* |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 321 | * Back to basic. |
| 322 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 323 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 324 | { |
| 325 | device->state = DASD_STATE_BASIC; |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 326 | return 0; |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | * Make the device online and schedule the bottom half to start |
| 331 | * the requeueing of requests from the linux request queue to the |
| 332 | * ccw queue. |
| 333 | */ |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 334 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | dasd_state_ready_to_online(struct dasd_device * device) |
| 336 | { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 337 | int rc; |
| 338 | |
| 339 | if (device->discipline->ready_to_online) { |
| 340 | rc = device->discipline->ready_to_online(device); |
| 341 | if (rc) |
| 342 | return rc; |
| 343 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | device->state = DASD_STATE_ONLINE; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 345 | if (device->block) |
| 346 | dasd_schedule_block_bh(device->block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Stop the requeueing of requests again. |
| 352 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 353 | static int dasd_state_online_to_ready(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 355 | int rc; |
| 356 | |
| 357 | if (device->discipline->online_to_ready) { |
| 358 | rc = device->discipline->online_to_ready(device); |
| 359 | if (rc) |
| 360 | return rc; |
| 361 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | device->state = DASD_STATE_READY; |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 363 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | /* |
| 367 | * Device startup state changes. |
| 368 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 369 | static int dasd_increase_state(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
| 371 | int rc; |
| 372 | |
| 373 | rc = 0; |
| 374 | if (device->state == DASD_STATE_NEW && |
| 375 | device->target >= DASD_STATE_KNOWN) |
| 376 | rc = dasd_state_new_to_known(device); |
| 377 | |
| 378 | if (!rc && |
| 379 | device->state == DASD_STATE_KNOWN && |
| 380 | device->target >= DASD_STATE_BASIC) |
| 381 | rc = dasd_state_known_to_basic(device); |
| 382 | |
| 383 | if (!rc && |
| 384 | device->state == DASD_STATE_BASIC && |
| 385 | device->target >= DASD_STATE_READY) |
| 386 | rc = dasd_state_basic_to_ready(device); |
| 387 | |
| 388 | if (!rc && |
Horst Hummel | 39ccf95 | 2006-04-27 18:40:10 -0700 | [diff] [blame] | 389 | device->state == DASD_STATE_UNFMT && |
| 390 | device->target > DASD_STATE_UNFMT) |
| 391 | rc = -EPERM; |
| 392 | |
| 393 | if (!rc && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | device->state == DASD_STATE_READY && |
| 395 | device->target >= DASD_STATE_ONLINE) |
| 396 | rc = dasd_state_ready_to_online(device); |
| 397 | |
| 398 | return rc; |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * Device shutdown state changes. |
| 403 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 404 | static int dasd_decrease_state(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | { |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 406 | int rc; |
| 407 | |
| 408 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | if (device->state == DASD_STATE_ONLINE && |
| 410 | device->target <= DASD_STATE_READY) |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 411 | rc = dasd_state_online_to_ready(device); |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 412 | |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 413 | if (!rc && |
| 414 | device->state == DASD_STATE_READY && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | device->target <= DASD_STATE_BASIC) |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 416 | rc = dasd_state_ready_to_basic(device); |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 417 | |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 418 | if (!rc && |
| 419 | device->state == DASD_STATE_UNFMT && |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 420 | device->target <= DASD_STATE_BASIC) |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 421 | rc = dasd_state_unfmt_to_basic(device); |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 422 | |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 423 | if (!rc && |
| 424 | device->state == DASD_STATE_BASIC && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | device->target <= DASD_STATE_KNOWN) |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 426 | rc = dasd_state_basic_to_known(device); |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 427 | |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 428 | if (!rc && |
| 429 | device->state == DASD_STATE_KNOWN && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | device->target <= DASD_STATE_NEW) |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 431 | rc = dasd_state_known_to_new(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 433 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | /* |
| 437 | * This is the main startup/shutdown routine. |
| 438 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 439 | static void dasd_change_state(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | { |
| 441 | int rc; |
| 442 | |
| 443 | if (device->state == device->target) |
| 444 | /* Already where we want to go today... */ |
| 445 | return; |
| 446 | if (device->state < device->target) |
| 447 | rc = dasd_increase_state(device); |
| 448 | else |
| 449 | rc = dasd_decrease_state(device); |
| 450 | if (rc && rc != -EAGAIN) |
| 451 | device->target = device->state; |
| 452 | |
| 453 | if (device->state == device->target) |
| 454 | wake_up(&dasd_init_waitq); |
Horst Hummel | 4dfd5c4 | 2007-04-27 16:01:47 +0200 | [diff] [blame] | 455 | |
| 456 | /* let user-space know that the device status changed */ |
| 457 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Kick starter for devices that did not complete the startup/shutdown |
| 462 | * procedure or were sleeping because of a pending state. |
| 463 | * dasd_kick_device will schedule a call do do_kick_device to the kernel |
| 464 | * event daemon. |
| 465 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 466 | static void do_kick_device(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | { |
Al Viro | 4927b3f | 2006-12-06 19:18:20 +0000 | [diff] [blame] | 468 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | dasd_change_state(device); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 470 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | dasd_put_device(device); |
| 472 | } |
| 473 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 474 | void dasd_kick_device(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | { |
| 476 | dasd_get_device(device); |
| 477 | /* queue call to dasd_kick_device to the kernel event daemon. */ |
| 478 | schedule_work(&device->kick_work); |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * Set the target state for a device and starts the state change. |
| 483 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 484 | void dasd_set_target_state(struct dasd_device *device, int target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | { |
| 486 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
| 487 | if (dasd_probeonly && target > DASD_STATE_READY) |
| 488 | target = DASD_STATE_READY; |
| 489 | if (device->target != target) { |
| 490 | if (device->state == target) |
| 491 | wake_up(&dasd_init_waitq); |
| 492 | device->target = target; |
| 493 | } |
| 494 | if (device->state != device->target) |
| 495 | dasd_change_state(device); |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Enable devices with device numbers in [from..to]. |
| 500 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 501 | static inline int _wait_for_device(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | { |
| 503 | return (device->state == device->target); |
| 504 | } |
| 505 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 506 | void dasd_enable_device(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | { |
| 508 | dasd_set_target_state(device, DASD_STATE_ONLINE); |
| 509 | if (device->state <= DASD_STATE_KNOWN) |
| 510 | /* No discipline for device found. */ |
| 511 | dasd_set_target_state(device, DASD_STATE_NEW); |
| 512 | /* Now wait for the devices to come up. */ |
| 513 | wait_event(dasd_init_waitq, _wait_for_device(device)); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) |
| 518 | */ |
| 519 | #ifdef CONFIG_DASD_PROFILE |
| 520 | |
| 521 | struct dasd_profile_info_t dasd_global_profile; |
| 522 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; |
| 523 | |
| 524 | /* |
| 525 | * Increments counter in global and local profiling structures. |
| 526 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 527 | #define dasd_profile_counter(value, counter, block) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { \ |
| 529 | int index; \ |
| 530 | for (index = 0; index < 31 && value >> (2+index); index++); \ |
| 531 | dasd_global_profile.counter[index]++; \ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 532 | block->profile.counter[index]++; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Add profiling information for cqr before execution. |
| 537 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 538 | static void dasd_profile_start(struct dasd_block *block, |
| 539 | struct dasd_ccw_req *cqr, |
| 540 | struct request *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
| 542 | struct list_head *l; |
| 543 | unsigned int counter; |
| 544 | |
| 545 | if (dasd_profile_level != DASD_PROFILE_ON) |
| 546 | return; |
| 547 | |
| 548 | /* count the length of the chanq for statistics */ |
| 549 | counter = 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 550 | list_for_each(l, &block->ccw_queue) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | if (++counter >= 31) |
| 552 | break; |
| 553 | dasd_global_profile.dasd_io_nr_req[counter]++; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 554 | block->profile.dasd_io_nr_req[counter]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | /* |
| 558 | * Add profiling information for cqr after execution. |
| 559 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 560 | static void dasd_profile_end(struct dasd_block *block, |
| 561 | struct dasd_ccw_req *cqr, |
| 562 | struct request *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
| 564 | long strtime, irqtime, endtime, tottime; /* in microseconds */ |
| 565 | long tottimeps, sectors; |
| 566 | |
| 567 | if (dasd_profile_level != DASD_PROFILE_ON) |
| 568 | return; |
| 569 | |
| 570 | sectors = req->nr_sectors; |
| 571 | if (!cqr->buildclk || !cqr->startclk || |
| 572 | !cqr->stopclk || !cqr->endclk || |
| 573 | !sectors) |
| 574 | return; |
| 575 | |
| 576 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); |
| 577 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); |
| 578 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); |
| 579 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); |
| 580 | tottimeps = tottime / sectors; |
| 581 | |
| 582 | if (!dasd_global_profile.dasd_io_reqs) |
| 583 | memset(&dasd_global_profile, 0, |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 584 | sizeof(struct dasd_profile_info_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | dasd_global_profile.dasd_io_reqs++; |
| 586 | dasd_global_profile.dasd_io_sects += sectors; |
| 587 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 588 | if (!block->profile.dasd_io_reqs) |
| 589 | memset(&block->profile, 0, |
| 590 | sizeof(struct dasd_profile_info_t)); |
| 591 | block->profile.dasd_io_reqs++; |
| 592 | block->profile.dasd_io_sects += sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 594 | dasd_profile_counter(sectors, dasd_io_secs, block); |
| 595 | dasd_profile_counter(tottime, dasd_io_times, block); |
| 596 | dasd_profile_counter(tottimeps, dasd_io_timps, block); |
| 597 | dasd_profile_counter(strtime, dasd_io_time1, block); |
| 598 | dasd_profile_counter(irqtime, dasd_io_time2, block); |
| 599 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); |
| 600 | dasd_profile_counter(endtime, dasd_io_time3, block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | } |
| 602 | #else |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 603 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
| 604 | #define dasd_profile_end(block, cqr, req) do {} while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | #endif /* CONFIG_DASD_PROFILE */ |
| 606 | |
| 607 | /* |
| 608 | * Allocate memory for a channel program with 'cplength' channel |
| 609 | * command words and 'datasize' additional space. There are two |
| 610 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed |
| 611 | * memory and 2) dasd_smalloc_request uses the static ccw memory |
| 612 | * that gets allocated for each device. |
| 613 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 614 | struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, |
| 615 | int datasize, |
| 616 | struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | { |
| 618 | struct dasd_ccw_req *cqr; |
| 619 | |
| 620 | /* Sanity checks */ |
Eric Sesterhenn | 7ac1e87 | 2006-03-24 18:48:13 +0100 | [diff] [blame] | 621 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
| 622 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 624 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | if (cqr == NULL) |
| 626 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | cqr->cpaddr = NULL; |
| 628 | if (cplength > 0) { |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 629 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | GFP_ATOMIC | GFP_DMA); |
| 631 | if (cqr->cpaddr == NULL) { |
| 632 | kfree(cqr); |
| 633 | return ERR_PTR(-ENOMEM); |
| 634 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | cqr->data = NULL; |
| 637 | if (datasize > 0) { |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 638 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | if (cqr->data == NULL) { |
Jesper Juhl | 17fd682 | 2005-11-07 01:01:30 -0800 | [diff] [blame] | 640 | kfree(cqr->cpaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | kfree(cqr); |
| 642 | return ERR_PTR(-ENOMEM); |
| 643 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | strncpy((char *) &cqr->magic, magic, 4); |
| 646 | ASCEBC((char *) &cqr->magic, 4); |
| 647 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
| 648 | dasd_get_device(device); |
| 649 | return cqr; |
| 650 | } |
| 651 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 652 | struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, |
| 653 | int datasize, |
| 654 | struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
| 656 | unsigned long flags; |
| 657 | struct dasd_ccw_req *cqr; |
| 658 | char *data; |
| 659 | int size; |
| 660 | |
| 661 | /* Sanity checks */ |
Eric Sesterhenn | 7ac1e87 | 2006-03-24 18:48:13 +0100 | [diff] [blame] | 662 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
| 663 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; |
| 666 | if (cplength > 0) |
| 667 | size += cplength * sizeof(struct ccw1); |
| 668 | if (datasize > 0) |
| 669 | size += datasize; |
| 670 | spin_lock_irqsave(&device->mem_lock, flags); |
| 671 | cqr = (struct dasd_ccw_req *) |
| 672 | dasd_alloc_chunk(&device->ccw_chunks, size); |
| 673 | spin_unlock_irqrestore(&device->mem_lock, flags); |
| 674 | if (cqr == NULL) |
| 675 | return ERR_PTR(-ENOMEM); |
| 676 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); |
| 677 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); |
| 678 | cqr->cpaddr = NULL; |
| 679 | if (cplength > 0) { |
| 680 | cqr->cpaddr = (struct ccw1 *) data; |
| 681 | data += cplength*sizeof(struct ccw1); |
| 682 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); |
| 683 | } |
| 684 | cqr->data = NULL; |
| 685 | if (datasize > 0) { |
| 686 | cqr->data = data; |
| 687 | memset(cqr->data, 0, datasize); |
| 688 | } |
| 689 | strncpy((char *) &cqr->magic, magic, 4); |
| 690 | ASCEBC((char *) &cqr->magic, 4); |
| 691 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
| 692 | dasd_get_device(device); |
| 693 | return cqr; |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * Free memory of a channel program. This function needs to free all the |
| 698 | * idal lists that might have been created by dasd_set_cda and the |
| 699 | * struct dasd_ccw_req itself. |
| 700 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 701 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 703 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | struct ccw1 *ccw; |
| 705 | |
| 706 | /* Clear any idals used for the request. */ |
| 707 | ccw = cqr->cpaddr; |
| 708 | do { |
| 709 | clear_normalized_cda(ccw); |
| 710 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); |
| 711 | #endif |
Jesper Juhl | 17fd682 | 2005-11-07 01:01:30 -0800 | [diff] [blame] | 712 | kfree(cqr->cpaddr); |
| 713 | kfree(cqr->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | kfree(cqr); |
| 715 | dasd_put_device(device); |
| 716 | } |
| 717 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 718 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
| 720 | unsigned long flags; |
| 721 | |
| 722 | spin_lock_irqsave(&device->mem_lock, flags); |
| 723 | dasd_free_chunk(&device->ccw_chunks, cqr); |
| 724 | spin_unlock_irqrestore(&device->mem_lock, flags); |
| 725 | dasd_put_device(device); |
| 726 | } |
| 727 | |
| 728 | /* |
| 729 | * Check discipline magic in cqr. |
| 730 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 731 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
| 733 | struct dasd_device *device; |
| 734 | |
| 735 | if (cqr == NULL) |
| 736 | return -EINVAL; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 737 | device = cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
| 739 | DEV_MESSAGE(KERN_WARNING, device, |
| 740 | " dasd_ccw_req 0x%08x magic doesn't match" |
| 741 | " discipline 0x%08x", |
| 742 | cqr->magic, |
| 743 | *(unsigned int *) device->discipline->name); |
| 744 | return -EINVAL; |
| 745 | } |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | /* |
| 750 | * Terminate the current i/o and set the request to clear_pending. |
| 751 | * Timer keeps device runnig. |
| 752 | * ccw_device_clear can fail if the i/o subsystem |
| 753 | * is in a bad mood. |
| 754 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 755 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
| 757 | struct dasd_device *device; |
| 758 | int retries, rc; |
| 759 | |
| 760 | /* Check the cqr */ |
| 761 | rc = dasd_check_cqr(cqr); |
| 762 | if (rc) |
| 763 | return rc; |
| 764 | retries = 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 765 | device = (struct dasd_device *) cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
| 767 | rc = ccw_device_clear(device->cdev, (long) cqr); |
| 768 | switch (rc) { |
| 769 | case 0: /* termination successful */ |
Horst Hummel | c2ba444 | 2006-02-01 03:06:37 -0800 | [diff] [blame] | 770 | cqr->retries--; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 771 | cqr->status = DASD_CQR_CLEAR_PENDING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | cqr->stopclk = get_clock(); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 773 | cqr->starttime = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | DBF_DEV_EVENT(DBF_DEBUG, device, |
| 775 | "terminate cqr %p successful", |
| 776 | cqr); |
| 777 | break; |
| 778 | case -ENODEV: |
| 779 | DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| 780 | "device gone, retry"); |
| 781 | break; |
| 782 | case -EIO: |
| 783 | DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| 784 | "I/O error, retry"); |
| 785 | break; |
| 786 | case -EINVAL: |
| 787 | case -EBUSY: |
| 788 | DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| 789 | "device busy, retry later"); |
| 790 | break; |
| 791 | default: |
| 792 | DEV_MESSAGE(KERN_ERR, device, |
| 793 | "line %d unknown RC=%d, please " |
| 794 | "report to linux390@de.ibm.com", |
| 795 | __LINE__, rc); |
| 796 | BUG(); |
| 797 | break; |
| 798 | } |
| 799 | retries++; |
| 800 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 801 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | return rc; |
| 803 | } |
| 804 | |
| 805 | /* |
| 806 | * Start the i/o. This start_IO can fail if the channel is really busy. |
| 807 | * In that case set up a timer to start the request later. |
| 808 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 809 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | { |
| 811 | struct dasd_device *device; |
| 812 | int rc; |
| 813 | |
| 814 | /* Check the cqr */ |
| 815 | rc = dasd_check_cqr(cqr); |
| 816 | if (rc) |
| 817 | return rc; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 818 | device = (struct dasd_device *) cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | if (cqr->retries < 0) { |
| 820 | DEV_MESSAGE(KERN_DEBUG, device, |
| 821 | "start_IO: request %p (%02x/%i) - no retry left.", |
| 822 | cqr, cqr->status, cqr->retries); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 823 | cqr->status = DASD_CQR_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | return -EIO; |
| 825 | } |
| 826 | cqr->startclk = get_clock(); |
| 827 | cqr->starttime = jiffies; |
| 828 | cqr->retries--; |
| 829 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, |
| 830 | cqr->lpm, 0); |
| 831 | switch (rc) { |
| 832 | case 0: |
| 833 | cqr->status = DASD_CQR_IN_IO; |
| 834 | DBF_DEV_EVENT(DBF_DEBUG, device, |
| 835 | "start_IO: request %p started successful", |
| 836 | cqr); |
| 837 | break; |
| 838 | case -EBUSY: |
| 839 | DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| 840 | "start_IO: device busy, retry later"); |
| 841 | break; |
| 842 | case -ETIMEDOUT: |
| 843 | DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| 844 | "start_IO: request timeout, retry later"); |
| 845 | break; |
| 846 | case -EACCES: |
| 847 | /* -EACCES indicates that the request used only a |
| 848 | * subset of the available pathes and all these |
| 849 | * pathes are gone. |
| 850 | * Do a retry with all available pathes. |
| 851 | */ |
| 852 | cqr->lpm = LPM_ANYPATH; |
| 853 | DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| 854 | "start_IO: selected pathes gone," |
| 855 | " retry on all pathes"); |
| 856 | break; |
| 857 | case -ENODEV: |
| 858 | case -EIO: |
| 859 | DBF_DEV_EVENT(DBF_ERR, device, "%s", |
| 860 | "start_IO: device gone, retry"); |
| 861 | break; |
| 862 | default: |
| 863 | DEV_MESSAGE(KERN_ERR, device, |
| 864 | "line %d unknown RC=%d, please report" |
| 865 | " to linux390@de.ibm.com", __LINE__, rc); |
| 866 | BUG(); |
| 867 | break; |
| 868 | } |
| 869 | return rc; |
| 870 | } |
| 871 | |
| 872 | /* |
| 873 | * Timeout function for dasd devices. This is used for different purposes |
| 874 | * 1) missing interrupt handler for normal operation |
| 875 | * 2) delayed start of request where start_IO failed with -EBUSY |
| 876 | * 3) timeout for missing state change interrupts |
| 877 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), |
| 878 | * DASD_CQR_QUEUED for 2) and 3). |
| 879 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 880 | static void dasd_device_timeout(unsigned long ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | { |
| 882 | unsigned long flags; |
| 883 | struct dasd_device *device; |
| 884 | |
| 885 | device = (struct dasd_device *) ptr; |
| 886 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| 887 | /* re-activate request queue */ |
| 888 | device->stopped &= ~DASD_STOPPED_PENDING; |
| 889 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 890 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
| 892 | |
| 893 | /* |
| 894 | * Setup timeout for a device in jiffies. |
| 895 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 896 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | { |
| 898 | if (expires == 0) { |
| 899 | if (timer_pending(&device->timer)) |
| 900 | del_timer(&device->timer); |
| 901 | return; |
| 902 | } |
| 903 | if (timer_pending(&device->timer)) { |
| 904 | if (mod_timer(&device->timer, jiffies + expires)) |
| 905 | return; |
| 906 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 907 | device->timer.function = dasd_device_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | device->timer.data = (unsigned long) device; |
| 909 | device->timer.expires = jiffies + expires; |
| 910 | add_timer(&device->timer); |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Clear timeout for a device. |
| 915 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 916 | void dasd_device_clear_timer(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | { |
| 918 | if (timer_pending(&device->timer)) |
| 919 | del_timer(&device->timer); |
| 920 | } |
| 921 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 922 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
| 923 | unsigned long intparm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | { |
| 925 | struct dasd_ccw_req *cqr; |
| 926 | struct dasd_device *device; |
| 927 | |
| 928 | cqr = (struct dasd_ccw_req *) intparm; |
| 929 | if (cqr->status != DASD_CQR_IN_IO) { |
| 930 | MESSAGE(KERN_DEBUG, |
| 931 | "invalid status in handle_killed_request: " |
| 932 | "bus_id %s, status %02x", |
| 933 | cdev->dev.bus_id, cqr->status); |
| 934 | return; |
| 935 | } |
| 936 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 937 | device = (struct dasd_device *) cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | if (device == NULL || |
Martin Schwidefsky | a00bfd7 | 2006-09-20 15:59:05 +0200 | [diff] [blame] | 939 | device != dasd_device_from_cdev_locked(cdev) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
| 941 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", |
| 942 | cdev->dev.bus_id); |
| 943 | return; |
| 944 | } |
| 945 | |
| 946 | /* Schedule request to be retried. */ |
| 947 | cqr->status = DASD_CQR_QUEUED; |
| 948 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 949 | dasd_device_clear_timer(device); |
| 950 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | dasd_put_device(device); |
| 952 | } |
| 953 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 954 | void dasd_generic_handle_state_change(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | { |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 956 | /* First of all start sense subsystem status request. */ |
| 957 | dasd_eer_snss(device); |
| 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | device->stopped &= ~DASD_STOPPED_PENDING; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 960 | dasd_schedule_device_bh(device); |
| 961 | if (device->block) |
| 962 | dasd_schedule_block_bh(device->block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | } |
| 964 | |
| 965 | /* |
| 966 | * Interrupt handler for "normal" ssch-io based dasd devices. |
| 967 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 968 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
| 969 | struct irb *irb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | { |
| 971 | struct dasd_ccw_req *cqr, *next; |
| 972 | struct dasd_device *device; |
| 973 | unsigned long long now; |
| 974 | int expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | |
| 976 | if (IS_ERR(irb)) { |
| 977 | switch (PTR_ERR(irb)) { |
| 978 | case -EIO: |
| 979 | dasd_handle_killed_request(cdev, intparm); |
| 980 | break; |
| 981 | case -ETIMEDOUT: |
| 982 | printk(KERN_WARNING"%s(%s): request timed out\n", |
| 983 | __FUNCTION__, cdev->dev.bus_id); |
| 984 | //FIXME - dasd uses own timeout interface... |
| 985 | break; |
| 986 | default: |
| 987 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", |
| 988 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); |
| 989 | } |
| 990 | return; |
| 991 | } |
| 992 | |
| 993 | now = get_clock(); |
| 994 | |
| 995 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", |
| 996 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), |
| 997 | (unsigned int) intparm); |
| 998 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 999 | /* check for unsolicited interrupts */ |
| 1000 | cqr = (struct dasd_ccw_req *) intparm; |
| 1001 | if (!cqr || ((irb->scsw.cc == 1) && |
| 1002 | (irb->scsw.fctl & SCSW_FCTL_START_FUNC) && |
| 1003 | (irb->scsw.stctl & SCSW_STCTL_STATUS_PEND)) ) { |
| 1004 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
| 1005 | cqr->status = DASD_CQR_QUEUED; |
Martin Schwidefsky | a00bfd7 | 2006-09-20 15:59:05 +0200 | [diff] [blame] | 1006 | device = dasd_device_from_cdev_locked(cdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | if (!IS_ERR(device)) { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1008 | dasd_device_clear_timer(device); |
| 1009 | device->discipline->handle_unsolicited_interrupt(device, |
| 1010 | irb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | dasd_put_device(device); |
| 1012 | } |
| 1013 | return; |
| 1014 | } |
| 1015 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1016 | device = (struct dasd_device *) cqr->startdev; |
| 1017 | if (!device || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
| 1019 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", |
| 1020 | cdev->dev.bus_id); |
| 1021 | return; |
| 1022 | } |
| 1023 | |
| 1024 | /* Check for clear pending */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1025 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1027 | cqr->status = DASD_CQR_CLEARED; |
| 1028 | dasd_device_clear_timer(device); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1029 | wake_up(&dasd_flush_wq); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1030 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | return; |
| 1032 | } |
| 1033 | |
| 1034 | /* check status - the request might have been killed by dyn detach */ |
| 1035 | if (cqr->status != DASD_CQR_IN_IO) { |
| 1036 | MESSAGE(KERN_DEBUG, |
| 1037 | "invalid status: bus_id %s, status %02x", |
| 1038 | cdev->dev.bus_id, cqr->status); |
| 1039 | return; |
| 1040 | } |
| 1041 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", |
| 1042 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1043 | next = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | expires = 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1045 | if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
| 1046 | irb->scsw.cstat == 0 && !irb->esw.esw0.erw.cons) { |
| 1047 | /* request was completed successfully */ |
| 1048 | cqr->status = DASD_CQR_SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | cqr->stopclk = now; |
| 1050 | /* Start first request on queue if possible -> fast_io. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1051 | if (cqr->devlist.next != &device->ccw_queue) { |
| 1052 | next = list_entry(cqr->devlist.next, |
| 1053 | struct dasd_ccw_req, devlist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1055 | } else { /* error */ |
| 1056 | memcpy(&cqr->irb, irb, sizeof(struct irb)); |
Horst Hummel | 9575bf2 | 2006-12-08 15:54:15 +0100 | [diff] [blame] | 1057 | if (device->features & DASD_FEATURE_ERPLOG) { |
Horst Hummel | 9575bf2 | 2006-12-08 15:54:15 +0100 | [diff] [blame] | 1058 | dasd_log_sense(cqr, irb); |
| 1059 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1060 | /* If we have no sense data, or we just don't want complex ERP |
| 1061 | * for this request, but if we have retries left, then just |
| 1062 | * reset this request and retry it in the fastpath |
| 1063 | */ |
| 1064 | if (!(cqr->irb.esw.esw0.erw.cons && |
| 1065 | test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) && |
| 1066 | cqr->retries > 0) { |
| 1067 | DEV_MESSAGE(KERN_DEBUG, device, |
| 1068 | "default ERP in fastpath (%i retries left)", |
| 1069 | cqr->retries); |
| 1070 | cqr->lpm = LPM_ANYPATH; |
| 1071 | cqr->status = DASD_CQR_QUEUED; |
| 1072 | next = cqr; |
| 1073 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | cqr->status = DASD_CQR_ERROR; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1075 | } |
| 1076 | if (next && (next->status == DASD_CQR_QUEUED) && |
| 1077 | (!device->stopped)) { |
| 1078 | if (device->discipline->start_IO(next) == 0) |
| 1079 | expires = next->expires; |
| 1080 | else |
| 1081 | DEV_MESSAGE(KERN_DEBUG, device, "%s", |
| 1082 | "Interrupt fastpath " |
| 1083 | "failed!"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | } |
| 1085 | if (expires != 0) |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1086 | dasd_device_set_timer(device, expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | else |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1088 | dasd_device_clear_timer(device); |
| 1089 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | } |
| 1091 | |
| 1092 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1093 | * If we have an error on a dasd_block layer request then we cancel |
| 1094 | * and return all further requests from the same dasd_block as well. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1096 | static void __dasd_device_recovery(struct dasd_device *device, |
| 1097 | struct dasd_ccw_req *ref_cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | { |
| 1099 | struct list_head *l, *n; |
| 1100 | struct dasd_ccw_req *cqr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
| 1102 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1103 | * only requeue request that came from the dasd_block layer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1105 | if (!ref_cqr->block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | return; |
Horst Hummel | f24acd4 | 2005-05-01 08:58:59 -0700 | [diff] [blame] | 1107 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1108 | list_for_each_safe(l, n, &device->ccw_queue) { |
| 1109 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
| 1110 | if (cqr->status == DASD_CQR_QUEUED && |
| 1111 | ref_cqr->block == cqr->block) { |
| 1112 | cqr->status = DASD_CQR_CLEARED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1114 | } |
| 1115 | }; |
| 1116 | |
| 1117 | /* |
| 1118 | * Remove those ccw requests from the queue that need to be returned |
| 1119 | * to the upper layer. |
| 1120 | */ |
| 1121 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
| 1122 | struct list_head *final_queue) |
| 1123 | { |
| 1124 | struct list_head *l, *n; |
| 1125 | struct dasd_ccw_req *cqr; |
| 1126 | |
| 1127 | /* Process request with final status. */ |
| 1128 | list_for_each_safe(l, n, &device->ccw_queue) { |
| 1129 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
| 1130 | |
| 1131 | /* Stop list processing at the first non-final request. */ |
| 1132 | if (cqr->status == DASD_CQR_QUEUED || |
| 1133 | cqr->status == DASD_CQR_IN_IO || |
| 1134 | cqr->status == DASD_CQR_CLEAR_PENDING) |
| 1135 | break; |
| 1136 | if (cqr->status == DASD_CQR_ERROR) { |
| 1137 | __dasd_device_recovery(device, cqr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1139 | /* Rechain finished requests to final queue */ |
| 1140 | list_move_tail(&cqr->devlist, final_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | } |
| 1142 | } |
| 1143 | |
| 1144 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1145 | * the cqrs from the final queue are returned to the upper layer |
| 1146 | * by setting a dasd_block state and calling the callback function |
| 1147 | */ |
| 1148 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
| 1149 | struct list_head *final_queue) |
| 1150 | { |
| 1151 | struct list_head *l, *n; |
| 1152 | struct dasd_ccw_req *cqr; |
| 1153 | |
| 1154 | list_for_each_safe(l, n, final_queue) { |
| 1155 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
| 1156 | list_del_init(&cqr->devlist); |
| 1157 | if (cqr->block) |
| 1158 | spin_lock_bh(&cqr->block->queue_lock); |
| 1159 | switch (cqr->status) { |
| 1160 | case DASD_CQR_SUCCESS: |
| 1161 | cqr->status = DASD_CQR_DONE; |
| 1162 | break; |
| 1163 | case DASD_CQR_ERROR: |
| 1164 | cqr->status = DASD_CQR_NEED_ERP; |
| 1165 | break; |
| 1166 | case DASD_CQR_CLEARED: |
| 1167 | cqr->status = DASD_CQR_TERMINATED; |
| 1168 | break; |
| 1169 | default: |
| 1170 | DEV_MESSAGE(KERN_ERR, device, |
| 1171 | "wrong cqr status in __dasd_process_final_queue " |
| 1172 | "for cqr %p, status %x", |
| 1173 | cqr, cqr->status); |
| 1174 | BUG(); |
| 1175 | } |
| 1176 | if (cqr->block) |
| 1177 | spin_unlock_bh(&cqr->block->queue_lock); |
| 1178 | if (cqr->callback != NULL) |
| 1179 | (cqr->callback)(cqr, cqr->callback_data); |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | |
| 1184 | |
| 1185 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | * Take a look at the first request on the ccw queue and check |
| 1187 | * if it reached its expire time. If so, terminate the IO. |
| 1188 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1189 | static void __dasd_device_check_expire(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | { |
| 1191 | struct dasd_ccw_req *cqr; |
| 1192 | |
| 1193 | if (list_empty(&device->ccw_queue)) |
| 1194 | return; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1195 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
Horst Hummel | 29145a6 | 2006-12-04 15:40:15 +0100 | [diff] [blame] | 1196 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
| 1197 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { |
| 1198 | if (device->discipline->term_IO(cqr) != 0) { |
| 1199 | /* Hmpf, try again in 5 sec */ |
Horst Hummel | 29145a6 | 2006-12-04 15:40:15 +0100 | [diff] [blame] | 1200 | DEV_MESSAGE(KERN_ERR, device, |
| 1201 | "internal error - timeout (%is) expired " |
| 1202 | "for cqr %p, termination failed, " |
| 1203 | "retrying in 5s", |
| 1204 | (cqr->expires/HZ), cqr); |
Stefan Haberland | 7dc1da9 | 2008-01-26 14:11:26 +0100 | [diff] [blame^] | 1205 | cqr->expires += 5*HZ; |
| 1206 | dasd_device_set_timer(device, 5*HZ); |
Horst Hummel | 29145a6 | 2006-12-04 15:40:15 +0100 | [diff] [blame] | 1207 | } else { |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1208 | DEV_MESSAGE(KERN_ERR, device, |
| 1209 | "internal error - timeout (%is) expired " |
| 1210 | "for cqr %p (%i retries left)", |
| 1211 | (cqr->expires/HZ), cqr, cqr->retries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | } |
| 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | /* |
| 1217 | * Take a look at the first request on the ccw queue and check |
| 1218 | * if it needs to be started. |
| 1219 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1220 | static void __dasd_device_start_head(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | { |
| 1222 | struct dasd_ccw_req *cqr; |
| 1223 | int rc; |
| 1224 | |
| 1225 | if (list_empty(&device->ccw_queue)) |
| 1226 | return; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1227 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
Peter Oberparleiter | 25ee4cf | 2006-04-10 22:53:47 -0700 | [diff] [blame] | 1228 | if (cqr->status != DASD_CQR_QUEUED) |
| 1229 | return; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1230 | /* when device is stopped, return request to previous layer */ |
| 1231 | if (device->stopped) { |
| 1232 | cqr->status = DASD_CQR_CLEARED; |
| 1233 | dasd_schedule_device_bh(device); |
Peter Oberparleiter | 25ee4cf | 2006-04-10 22:53:47 -0700 | [diff] [blame] | 1234 | return; |
Horst Hummel | 1c01b8a | 2006-01-06 00:19:15 -0800 | [diff] [blame] | 1235 | } |
Peter Oberparleiter | 25ee4cf | 2006-04-10 22:53:47 -0700 | [diff] [blame] | 1236 | |
| 1237 | rc = device->discipline->start_IO(cqr); |
| 1238 | if (rc == 0) |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1239 | dasd_device_set_timer(device, cqr->expires); |
Peter Oberparleiter | 25ee4cf | 2006-04-10 22:53:47 -0700 | [diff] [blame] | 1240 | else if (rc == -EACCES) { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1241 | dasd_schedule_device_bh(device); |
Peter Oberparleiter | 25ee4cf | 2006-04-10 22:53:47 -0700 | [diff] [blame] | 1242 | } else |
| 1243 | /* Hmpf, try again in 1/2 sec */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1244 | dasd_device_set_timer(device, 50); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1245 | } |
| 1246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1248 | * Go through all request on the dasd_device request queue, |
| 1249 | * terminate them on the cdev if necessary, and return them to the |
| 1250 | * submitting layer via callback. |
| 1251 | * Note: |
| 1252 | * Make sure that all 'submitting layers' still exist when |
| 1253 | * this function is called!. In other words, when 'device' is a base |
| 1254 | * device then all block layer requests must have been removed before |
| 1255 | * via dasd_flush_block_queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1257 | int dasd_flush_device_queue(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1259 | struct dasd_ccw_req *cqr, *n; |
| 1260 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | struct list_head flush_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | |
| 1263 | INIT_LIST_HEAD(&flush_queue); |
| 1264 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1265 | rc = 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1266 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1267 | /* Check status and move request to flush_queue */ |
| 1268 | switch (cqr->status) { |
| 1269 | case DASD_CQR_IN_IO: |
| 1270 | rc = device->discipline->term_IO(cqr); |
| 1271 | if (rc) { |
| 1272 | /* unable to terminate requeust */ |
| 1273 | DEV_MESSAGE(KERN_ERR, device, |
| 1274 | "dasd flush ccw_queue is unable " |
| 1275 | " to terminate request %p", |
| 1276 | cqr); |
| 1277 | /* stop flush processing */ |
| 1278 | goto finished; |
| 1279 | } |
| 1280 | break; |
| 1281 | case DASD_CQR_QUEUED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | cqr->stopclk = get_clock(); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1283 | cqr->status = DASD_CQR_CLEARED; |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1284 | break; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1285 | default: /* no need to modify the others */ |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1286 | break; |
| 1287 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1288 | list_move_tail(&cqr->devlist, &flush_queue); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1289 | } |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1290 | finished: |
| 1291 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1292 | /* |
| 1293 | * After this point all requests must be in state CLEAR_PENDING, |
| 1294 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become |
| 1295 | * one of the others. |
| 1296 | */ |
| 1297 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) |
| 1298 | wait_event(dasd_flush_wq, |
| 1299 | (cqr->status != DASD_CQR_CLEAR_PENDING)); |
| 1300 | /* |
| 1301 | * Now set each request back to TERMINATED, DONE or NEED_ERP |
| 1302 | * and call the callback function of flushed requests |
| 1303 | */ |
| 1304 | __dasd_device_process_final_queue(device, &flush_queue); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1305 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | } |
| 1307 | |
| 1308 | /* |
| 1309 | * Acquire the device lock and process queues for the device. |
| 1310 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1311 | static void dasd_device_tasklet(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | { |
| 1313 | struct list_head final_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | |
| 1315 | atomic_set (&device->tasklet_scheduled, 0); |
| 1316 | INIT_LIST_HEAD(&final_queue); |
| 1317 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| 1318 | /* Check expire time of first request on the ccw queue. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1319 | __dasd_device_check_expire(device); |
| 1320 | /* find final requests on ccw queue */ |
| 1321 | __dasd_device_process_ccw_queue(device, &final_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| 1323 | /* Now call the callback function of requests with final status */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1324 | __dasd_device_process_final_queue(device, &final_queue); |
| 1325 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | /* Now check if the head of the ccw queue needs to be started. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1327 | __dasd_device_start_head(device); |
| 1328 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | dasd_put_device(device); |
| 1330 | } |
| 1331 | |
| 1332 | /* |
| 1333 | * Schedules a call to dasd_tasklet over the device tasklet. |
| 1334 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1335 | void dasd_schedule_device_bh(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | { |
| 1337 | /* Protect against rescheduling. */ |
Martin Schwidefsky | 973bd99 | 2006-01-06 00:19:07 -0800 | [diff] [blame] | 1338 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | return; |
| 1340 | dasd_get_device(device); |
| 1341 | tasklet_hi_schedule(&device->tasklet); |
| 1342 | } |
| 1343 | |
| 1344 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1345 | * Queue a request to the head of the device ccw_queue. |
| 1346 | * Start the I/O if possible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1348 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | { |
| 1350 | struct dasd_device *device; |
| 1351 | unsigned long flags; |
| 1352 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1353 | device = cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1355 | cqr->status = DASD_CQR_QUEUED; |
| 1356 | list_add(&cqr->devlist, &device->ccw_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | /* let the bh start the request to keep them in order */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1358 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| 1360 | } |
| 1361 | |
| 1362 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1363 | * Queue a request to the tail of the device ccw_queue. |
| 1364 | * Start the I/O if possible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1366 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | { |
| 1368 | struct dasd_device *device; |
| 1369 | unsigned long flags; |
| 1370 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1371 | device = cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1373 | cqr->status = DASD_CQR_QUEUED; |
| 1374 | list_add_tail(&cqr->devlist, &device->ccw_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | /* let the bh start the request to keep them in order */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1376 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| 1378 | } |
| 1379 | |
| 1380 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1381 | * Wakeup helper for the 'sleep_on' functions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1383 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | { |
| 1385 | wake_up((wait_queue_head_t *) data); |
| 1386 | } |
| 1387 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1388 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | { |
| 1390 | struct dasd_device *device; |
| 1391 | int rc; |
| 1392 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1393 | device = cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
Horst Hummel | c2ba444 | 2006-02-01 03:06:37 -0800 | [diff] [blame] | 1395 | rc = ((cqr->status == DASD_CQR_DONE || |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1396 | cqr->status == DASD_CQR_NEED_ERP || |
| 1397 | cqr->status == DASD_CQR_TERMINATED) && |
| 1398 | list_empty(&cqr->devlist)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| 1400 | return rc; |
| 1401 | } |
| 1402 | |
| 1403 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1404 | * Queue a request to the tail of the device ccw_queue and wait for |
| 1405 | * it's completion. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1407 | int dasd_sleep_on(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | { |
| 1409 | wait_queue_head_t wait_q; |
| 1410 | struct dasd_device *device; |
| 1411 | int rc; |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1412 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1413 | device = cqr->startdev; |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | init_waitqueue_head (&wait_q); |
| 1416 | cqr->callback = dasd_wakeup_cb; |
| 1417 | cqr->callback_data = (void *) &wait_q; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1418 | dasd_add_request_tail(cqr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | wait_event(wait_q, _wait_for_wakeup(cqr)); |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | /* Request status is either done or failed. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1422 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | return rc; |
| 1424 | } |
| 1425 | |
| 1426 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1427 | * Queue a request to the tail of the device ccw_queue and wait |
| 1428 | * interruptible for it's completion. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1430 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | { |
| 1432 | wait_queue_head_t wait_q; |
| 1433 | struct dasd_device *device; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1434 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1436 | device = cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | init_waitqueue_head (&wait_q); |
| 1438 | cqr->callback = dasd_wakeup_cb; |
| 1439 | cqr->callback_data = (void *) &wait_q; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1440 | dasd_add_request_tail(cqr); |
| 1441 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); |
| 1442 | if (rc == -ERESTARTSYS) { |
| 1443 | dasd_cancel_req(cqr); |
| 1444 | /* wait (non-interruptible) for final status */ |
| 1445 | wait_event(wait_q, _wait_for_wakeup(cqr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1447 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | return rc; |
| 1449 | } |
| 1450 | |
| 1451 | /* |
| 1452 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock |
| 1453 | * for eckd devices) the currently running request has to be terminated |
| 1454 | * and be put back to status queued, before the special request is added |
| 1455 | * to the head of the queue. Then the special request is waited on normally. |
| 1456 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1457 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | { |
| 1459 | struct dasd_ccw_req *cqr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | |
| 1461 | if (list_empty(&device->ccw_queue)) |
| 1462 | return 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1463 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 1464 | return device->discipline->term_IO(cqr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | } |
| 1466 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1467 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | { |
| 1469 | wait_queue_head_t wait_q; |
| 1470 | struct dasd_device *device; |
| 1471 | int rc; |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1472 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1473 | device = cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
| 1475 | rc = _dasd_term_running_cqr(device); |
| 1476 | if (rc) { |
| 1477 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| 1478 | return rc; |
| 1479 | } |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | init_waitqueue_head (&wait_q); |
| 1482 | cqr->callback = dasd_wakeup_cb; |
| 1483 | cqr->callback_data = (void *) &wait_q; |
| 1484 | cqr->status = DASD_CQR_QUEUED; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1485 | list_add(&cqr->devlist, &device->ccw_queue); |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | /* let the bh start the request to keep them in order */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1488 | dasd_schedule_device_bh(device); |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
| 1491 | |
| 1492 | wait_event(wait_q, _wait_for_wakeup(cqr)); |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 1493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | /* Request status is either done or failed. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1495 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | return rc; |
| 1497 | } |
| 1498 | |
| 1499 | /* |
| 1500 | * Cancels a request that was started with dasd_sleep_on_req. |
| 1501 | * This is useful to timeout requests. The request will be |
| 1502 | * terminated if it is currently in i/o. |
| 1503 | * Returns 1 if the request has been terminated. |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1504 | * 0 if there was no need to terminate the request (not started yet) |
| 1505 | * negative error code if termination failed |
| 1506 | * Cancellation of a request is an asynchronous operation! The calling |
| 1507 | * function has to wait until the request is properly returned via callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1509 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1511 | struct dasd_device *device = cqr->startdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | unsigned long flags; |
| 1513 | int rc; |
| 1514 | |
| 1515 | rc = 0; |
| 1516 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| 1517 | switch (cqr->status) { |
| 1518 | case DASD_CQR_QUEUED: |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1519 | /* request was not started - just set to cleared */ |
| 1520 | cqr->status = DASD_CQR_CLEARED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | break; |
| 1522 | case DASD_CQR_IN_IO: |
| 1523 | /* request in IO - terminate IO and release again */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1524 | rc = device->discipline->term_IO(cqr); |
| 1525 | if (rc) { |
| 1526 | DEV_MESSAGE(KERN_ERR, device, |
| 1527 | "dasd_cancel_req is unable " |
| 1528 | " to terminate request %p, rc = %d", |
| 1529 | cqr, rc); |
| 1530 | } else { |
| 1531 | cqr->stopclk = get_clock(); |
| 1532 | rc = 1; |
| 1533 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | break; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1535 | default: /* already finished or clear pending - do nothing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | } |
| 1538 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1539 | dasd_schedule_device_bh(device); |
| 1540 | return rc; |
| 1541 | } |
| 1542 | |
| 1543 | |
| 1544 | /* |
| 1545 | * SECTION: Operations of the dasd_block layer. |
| 1546 | */ |
| 1547 | |
| 1548 | /* |
| 1549 | * Timeout function for dasd_block. This is used when the block layer |
| 1550 | * is waiting for something that may not come reliably, (e.g. a state |
| 1551 | * change interrupt) |
| 1552 | */ |
| 1553 | static void dasd_block_timeout(unsigned long ptr) |
| 1554 | { |
| 1555 | unsigned long flags; |
| 1556 | struct dasd_block *block; |
| 1557 | |
| 1558 | block = (struct dasd_block *) ptr; |
| 1559 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); |
| 1560 | /* re-activate request queue */ |
| 1561 | block->base->stopped &= ~DASD_STOPPED_PENDING; |
| 1562 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
| 1563 | dasd_schedule_block_bh(block); |
| 1564 | } |
| 1565 | |
| 1566 | /* |
| 1567 | * Setup timeout for a dasd_block in jiffies. |
| 1568 | */ |
| 1569 | void dasd_block_set_timer(struct dasd_block *block, int expires) |
| 1570 | { |
| 1571 | if (expires == 0) { |
| 1572 | if (timer_pending(&block->timer)) |
| 1573 | del_timer(&block->timer); |
| 1574 | return; |
| 1575 | } |
| 1576 | if (timer_pending(&block->timer)) { |
| 1577 | if (mod_timer(&block->timer, jiffies + expires)) |
| 1578 | return; |
| 1579 | } |
| 1580 | block->timer.function = dasd_block_timeout; |
| 1581 | block->timer.data = (unsigned long) block; |
| 1582 | block->timer.expires = jiffies + expires; |
| 1583 | add_timer(&block->timer); |
| 1584 | } |
| 1585 | |
| 1586 | /* |
| 1587 | * Clear timeout for a dasd_block. |
| 1588 | */ |
| 1589 | void dasd_block_clear_timer(struct dasd_block *block) |
| 1590 | { |
| 1591 | if (timer_pending(&block->timer)) |
| 1592 | del_timer(&block->timer); |
| 1593 | } |
| 1594 | |
| 1595 | /* |
| 1596 | * posts the buffer_cache about a finalized request |
| 1597 | */ |
| 1598 | static inline void dasd_end_request(struct request *req, int uptodate) |
| 1599 | { |
| 1600 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) |
| 1601 | BUG(); |
| 1602 | add_disk_randomness(req->rq_disk); |
| 1603 | end_that_request_last(req, uptodate); |
| 1604 | } |
| 1605 | |
| 1606 | /* |
| 1607 | * Process finished error recovery ccw. |
| 1608 | */ |
| 1609 | static inline void __dasd_block_process_erp(struct dasd_block *block, |
| 1610 | struct dasd_ccw_req *cqr) |
| 1611 | { |
| 1612 | dasd_erp_fn_t erp_fn; |
| 1613 | struct dasd_device *device = block->base; |
| 1614 | |
| 1615 | if (cqr->status == DASD_CQR_DONE) |
| 1616 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); |
| 1617 | else |
| 1618 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); |
| 1619 | erp_fn = device->discipline->erp_postaction(cqr); |
| 1620 | erp_fn(cqr); |
| 1621 | } |
| 1622 | |
| 1623 | /* |
| 1624 | * Fetch requests from the block device queue. |
| 1625 | */ |
| 1626 | static void __dasd_process_request_queue(struct dasd_block *block) |
| 1627 | { |
| 1628 | struct request_queue *queue; |
| 1629 | struct request *req; |
| 1630 | struct dasd_ccw_req *cqr; |
| 1631 | struct dasd_device *basedev; |
| 1632 | unsigned long flags; |
| 1633 | queue = block->request_queue; |
| 1634 | basedev = block->base; |
| 1635 | /* No queue ? Then there is nothing to do. */ |
| 1636 | if (queue == NULL) |
| 1637 | return; |
| 1638 | |
| 1639 | /* |
| 1640 | * We requeue request from the block device queue to the ccw |
| 1641 | * queue only in two states. In state DASD_STATE_READY the |
| 1642 | * partition detection is done and we need to requeue requests |
| 1643 | * for that. State DASD_STATE_ONLINE is normal block device |
| 1644 | * operation. |
| 1645 | */ |
| 1646 | if (basedev->state < DASD_STATE_READY) |
| 1647 | return; |
| 1648 | /* Now we try to fetch requests from the request queue */ |
| 1649 | while (!blk_queue_plugged(queue) && |
| 1650 | elv_next_request(queue)) { |
| 1651 | |
| 1652 | req = elv_next_request(queue); |
| 1653 | |
| 1654 | if (basedev->features & DASD_FEATURE_READONLY && |
| 1655 | rq_data_dir(req) == WRITE) { |
| 1656 | DBF_DEV_EVENT(DBF_ERR, basedev, |
| 1657 | "Rejecting write request %p", |
| 1658 | req); |
| 1659 | blkdev_dequeue_request(req); |
| 1660 | dasd_end_request(req, 0); |
| 1661 | continue; |
| 1662 | } |
| 1663 | cqr = basedev->discipline->build_cp(basedev, block, req); |
| 1664 | if (IS_ERR(cqr)) { |
| 1665 | if (PTR_ERR(cqr) == -EBUSY) |
| 1666 | break; /* normal end condition */ |
| 1667 | if (PTR_ERR(cqr) == -ENOMEM) |
| 1668 | break; /* terminate request queue loop */ |
| 1669 | if (PTR_ERR(cqr) == -EAGAIN) { |
| 1670 | /* |
| 1671 | * The current request cannot be build right |
| 1672 | * now, we have to try later. If this request |
| 1673 | * is the head-of-queue we stop the device |
| 1674 | * for 1/2 second. |
| 1675 | */ |
| 1676 | if (!list_empty(&block->ccw_queue)) |
| 1677 | break; |
| 1678 | spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags); |
| 1679 | basedev->stopped |= DASD_STOPPED_PENDING; |
| 1680 | spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags); |
| 1681 | dasd_block_set_timer(block, HZ/2); |
| 1682 | break; |
| 1683 | } |
| 1684 | DBF_DEV_EVENT(DBF_ERR, basedev, |
| 1685 | "CCW creation failed (rc=%ld) " |
| 1686 | "on request %p", |
| 1687 | PTR_ERR(cqr), req); |
| 1688 | blkdev_dequeue_request(req); |
| 1689 | dasd_end_request(req, 0); |
| 1690 | continue; |
| 1691 | } |
| 1692 | /* |
| 1693 | * Note: callback is set to dasd_return_cqr_cb in |
| 1694 | * __dasd_block_start_head to cover erp requests as well |
| 1695 | */ |
| 1696 | cqr->callback_data = (void *) req; |
| 1697 | cqr->status = DASD_CQR_FILLED; |
| 1698 | blkdev_dequeue_request(req); |
| 1699 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
| 1700 | dasd_profile_start(block, cqr, req); |
| 1701 | } |
| 1702 | } |
| 1703 | |
| 1704 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) |
| 1705 | { |
| 1706 | struct request *req; |
| 1707 | int status; |
| 1708 | |
| 1709 | req = (struct request *) cqr->callback_data; |
| 1710 | dasd_profile_end(cqr->block, cqr, req); |
| 1711 | status = cqr->memdev->discipline->free_cp(cqr, req); |
| 1712 | dasd_end_request(req, status); |
| 1713 | } |
| 1714 | |
| 1715 | /* |
| 1716 | * Process ccw request queue. |
| 1717 | */ |
| 1718 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, |
| 1719 | struct list_head *final_queue) |
| 1720 | { |
| 1721 | struct list_head *l, *n; |
| 1722 | struct dasd_ccw_req *cqr; |
| 1723 | dasd_erp_fn_t erp_fn; |
| 1724 | unsigned long flags; |
| 1725 | struct dasd_device *base = block->base; |
| 1726 | |
| 1727 | restart: |
| 1728 | /* Process request with final status. */ |
| 1729 | list_for_each_safe(l, n, &block->ccw_queue) { |
| 1730 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); |
| 1731 | if (cqr->status != DASD_CQR_DONE && |
| 1732 | cqr->status != DASD_CQR_FAILED && |
| 1733 | cqr->status != DASD_CQR_NEED_ERP && |
| 1734 | cqr->status != DASD_CQR_TERMINATED) |
| 1735 | continue; |
| 1736 | |
| 1737 | if (cqr->status == DASD_CQR_TERMINATED) { |
| 1738 | base->discipline->handle_terminated_request(cqr); |
| 1739 | goto restart; |
| 1740 | } |
| 1741 | |
| 1742 | /* Process requests that may be recovered */ |
| 1743 | if (cqr->status == DASD_CQR_NEED_ERP) { |
| 1744 | if (cqr->irb.esw.esw0.erw.cons && |
| 1745 | test_bit(DASD_CQR_FLAGS_USE_ERP, |
| 1746 | &cqr->flags)) { |
| 1747 | erp_fn = base->discipline->erp_action(cqr); |
| 1748 | erp_fn(cqr); |
| 1749 | } |
| 1750 | goto restart; |
| 1751 | } |
| 1752 | |
| 1753 | /* First of all call extended error reporting. */ |
| 1754 | if (dasd_eer_enabled(base) && |
| 1755 | cqr->status == DASD_CQR_FAILED) { |
| 1756 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); |
| 1757 | |
| 1758 | /* restart request */ |
| 1759 | cqr->status = DASD_CQR_FILLED; |
| 1760 | cqr->retries = 255; |
| 1761 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
| 1762 | base->stopped |= DASD_STOPPED_QUIESCE; |
| 1763 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
| 1764 | flags); |
| 1765 | goto restart; |
| 1766 | } |
| 1767 | |
| 1768 | /* Process finished ERP request. */ |
| 1769 | if (cqr->refers) { |
| 1770 | __dasd_block_process_erp(block, cqr); |
| 1771 | goto restart; |
| 1772 | } |
| 1773 | |
| 1774 | /* Rechain finished requests to final queue */ |
| 1775 | cqr->endclk = get_clock(); |
| 1776 | list_move_tail(&cqr->blocklist, final_queue); |
| 1777 | } |
| 1778 | } |
| 1779 | |
| 1780 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) |
| 1781 | { |
| 1782 | dasd_schedule_block_bh(cqr->block); |
| 1783 | } |
| 1784 | |
| 1785 | static void __dasd_block_start_head(struct dasd_block *block) |
| 1786 | { |
| 1787 | struct dasd_ccw_req *cqr; |
| 1788 | |
| 1789 | if (list_empty(&block->ccw_queue)) |
| 1790 | return; |
| 1791 | /* We allways begin with the first requests on the queue, as some |
| 1792 | * of previously started requests have to be enqueued on a |
| 1793 | * dasd_device again for error recovery. |
| 1794 | */ |
| 1795 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { |
| 1796 | if (cqr->status != DASD_CQR_FILLED) |
| 1797 | continue; |
| 1798 | /* Non-temporary stop condition will trigger fail fast */ |
| 1799 | if (block->base->stopped & ~DASD_STOPPED_PENDING && |
| 1800 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
| 1801 | (!dasd_eer_enabled(block->base))) { |
| 1802 | cqr->status = DASD_CQR_FAILED; |
| 1803 | dasd_schedule_block_bh(block); |
| 1804 | continue; |
| 1805 | } |
| 1806 | /* Don't try to start requests if device is stopped */ |
| 1807 | if (block->base->stopped) |
| 1808 | return; |
| 1809 | |
| 1810 | /* just a fail safe check, should not happen */ |
| 1811 | if (!cqr->startdev) |
| 1812 | cqr->startdev = block->base; |
| 1813 | |
| 1814 | /* make sure that the requests we submit find their way back */ |
| 1815 | cqr->callback = dasd_return_cqr_cb; |
| 1816 | |
| 1817 | dasd_add_request_tail(cqr); |
| 1818 | } |
| 1819 | } |
| 1820 | |
| 1821 | /* |
| 1822 | * Central dasd_block layer routine. Takes requests from the generic |
| 1823 | * block layer request queue, creates ccw requests, enqueues them on |
| 1824 | * a dasd_device and processes ccw requests that have been returned. |
| 1825 | */ |
| 1826 | static void dasd_block_tasklet(struct dasd_block *block) |
| 1827 | { |
| 1828 | struct list_head final_queue; |
| 1829 | struct list_head *l, *n; |
| 1830 | struct dasd_ccw_req *cqr; |
| 1831 | |
| 1832 | atomic_set(&block->tasklet_scheduled, 0); |
| 1833 | INIT_LIST_HEAD(&final_queue); |
| 1834 | spin_lock(&block->queue_lock); |
| 1835 | /* Finish off requests on ccw queue */ |
| 1836 | __dasd_process_block_ccw_queue(block, &final_queue); |
| 1837 | spin_unlock(&block->queue_lock); |
| 1838 | /* Now call the callback function of requests with final status */ |
| 1839 | spin_lock_irq(&block->request_queue_lock); |
| 1840 | list_for_each_safe(l, n, &final_queue) { |
| 1841 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); |
| 1842 | list_del_init(&cqr->blocklist); |
| 1843 | __dasd_cleanup_cqr(cqr); |
| 1844 | } |
| 1845 | spin_lock(&block->queue_lock); |
| 1846 | /* Get new request from the block device request queue */ |
| 1847 | __dasd_process_request_queue(block); |
| 1848 | /* Now check if the head of the ccw queue needs to be started. */ |
| 1849 | __dasd_block_start_head(block); |
| 1850 | spin_unlock(&block->queue_lock); |
| 1851 | spin_unlock_irq(&block->request_queue_lock); |
| 1852 | dasd_put_device(block->base); |
| 1853 | } |
| 1854 | |
| 1855 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) |
| 1856 | { |
| 1857 | wake_up(&dasd_flush_wq); |
| 1858 | } |
| 1859 | |
| 1860 | /* |
| 1861 | * Go through all request on the dasd_block request queue, cancel them |
| 1862 | * on the respective dasd_device, and return them to the generic |
| 1863 | * block layer. |
| 1864 | */ |
| 1865 | static int dasd_flush_block_queue(struct dasd_block *block) |
| 1866 | { |
| 1867 | struct dasd_ccw_req *cqr, *n; |
| 1868 | int rc, i; |
| 1869 | struct list_head flush_queue; |
| 1870 | |
| 1871 | INIT_LIST_HEAD(&flush_queue); |
| 1872 | spin_lock_bh(&block->queue_lock); |
| 1873 | rc = 0; |
| 1874 | restart: |
| 1875 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { |
| 1876 | /* if this request currently owned by a dasd_device cancel it */ |
| 1877 | if (cqr->status >= DASD_CQR_QUEUED) |
| 1878 | rc = dasd_cancel_req(cqr); |
| 1879 | if (rc < 0) |
| 1880 | break; |
| 1881 | /* Rechain request (including erp chain) so it won't be |
| 1882 | * touched by the dasd_block_tasklet anymore. |
| 1883 | * Replace the callback so we notice when the request |
| 1884 | * is returned from the dasd_device layer. |
| 1885 | */ |
| 1886 | cqr->callback = _dasd_wake_block_flush_cb; |
| 1887 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) |
| 1888 | list_move_tail(&cqr->blocklist, &flush_queue); |
| 1889 | if (i > 1) |
| 1890 | /* moved more than one request - need to restart */ |
| 1891 | goto restart; |
| 1892 | } |
| 1893 | spin_unlock_bh(&block->queue_lock); |
| 1894 | /* Now call the callback function of flushed requests */ |
| 1895 | restart_cb: |
| 1896 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { |
| 1897 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); |
| 1898 | /* Process finished ERP request. */ |
| 1899 | if (cqr->refers) { |
| 1900 | __dasd_block_process_erp(block, cqr); |
| 1901 | /* restart list_for_xx loop since dasd_process_erp |
| 1902 | * might remove multiple elements */ |
| 1903 | goto restart_cb; |
| 1904 | } |
| 1905 | /* call the callback function */ |
| 1906 | cqr->endclk = get_clock(); |
| 1907 | list_del_init(&cqr->blocklist); |
| 1908 | __dasd_cleanup_cqr(cqr); |
| 1909 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | return rc; |
| 1911 | } |
| 1912 | |
| 1913 | /* |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1914 | * Schedules a call to dasd_tasklet over the device tasklet. |
| 1915 | */ |
| 1916 | void dasd_schedule_block_bh(struct dasd_block *block) |
| 1917 | { |
| 1918 | /* Protect against rescheduling. */ |
| 1919 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) |
| 1920 | return; |
| 1921 | /* life cycle of block is bound to it's base device */ |
| 1922 | dasd_get_device(block->base); |
| 1923 | tasklet_hi_schedule(&block->tasklet); |
| 1924 | } |
| 1925 | |
| 1926 | |
| 1927 | /* |
| 1928 | * SECTION: external block device operations |
| 1929 | * (request queue handling, open, release, etc.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | */ |
| 1931 | |
| 1932 | /* |
| 1933 | * Dasd request queue function. Called from ll_rw_blk.c |
| 1934 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1935 | static void do_dasd_request(struct request_queue *queue) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1937 | struct dasd_block *block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1939 | block = queue->queuedata; |
| 1940 | spin_lock(&block->queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | /* Get new request from the block device request queue */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1942 | __dasd_process_request_queue(block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | /* Now check if the head of the ccw queue needs to be started. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1944 | __dasd_block_start_head(block); |
| 1945 | spin_unlock(&block->queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | } |
| 1947 | |
| 1948 | /* |
| 1949 | * Allocate and initialize request queue and default I/O scheduler. |
| 1950 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1951 | static int dasd_alloc_queue(struct dasd_block *block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | { |
| 1953 | int rc; |
| 1954 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1955 | block->request_queue = blk_init_queue(do_dasd_request, |
| 1956 | &block->request_queue_lock); |
| 1957 | if (block->request_queue == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | return -ENOMEM; |
| 1959 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1960 | block->request_queue->queuedata = block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1962 | elevator_exit(block->request_queue->elevator); |
| 1963 | rc = elevator_init(block->request_queue, "deadline"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | if (rc) { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1965 | blk_cleanup_queue(block->request_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | return rc; |
| 1967 | } |
| 1968 | return 0; |
| 1969 | } |
| 1970 | |
| 1971 | /* |
| 1972 | * Allocate and initialize request queue. |
| 1973 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1974 | static void dasd_setup_queue(struct dasd_block *block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | { |
| 1976 | int max; |
| 1977 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1978 | blk_queue_hardsect_size(block->request_queue, block->bp_block); |
| 1979 | max = block->base->discipline->max_blocks << block->s2b_shift; |
| 1980 | blk_queue_max_sectors(block->request_queue, max); |
| 1981 | blk_queue_max_phys_segments(block->request_queue, -1L); |
| 1982 | blk_queue_max_hw_segments(block->request_queue, -1L); |
| 1983 | blk_queue_max_segment_size(block->request_queue, -1L); |
| 1984 | blk_queue_segment_boundary(block->request_queue, -1L); |
| 1985 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | } |
| 1987 | |
| 1988 | /* |
| 1989 | * Deactivate and free request queue. |
| 1990 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1991 | static void dasd_free_queue(struct dasd_block *block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 1993 | if (block->request_queue) { |
| 1994 | blk_cleanup_queue(block->request_queue); |
| 1995 | block->request_queue = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | } |
| 1997 | } |
| 1998 | |
| 1999 | /* |
| 2000 | * Flush request on the request queue. |
| 2001 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2002 | static void dasd_flush_request_queue(struct dasd_block *block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | { |
| 2004 | struct request *req; |
| 2005 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2006 | if (!block->request_queue) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | return; |
Horst Hummel | 138c014 | 2006-06-29 14:58:12 +0200 | [diff] [blame] | 2008 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2009 | spin_lock_irq(&block->request_queue_lock); |
| 2010 | while ((req = elv_next_request(block->request_queue))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | blkdev_dequeue_request(req); |
Horst Hummel | ebc4599 | 2006-08-09 10:30:22 +0200 | [diff] [blame] | 2012 | dasd_end_request(req, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | } |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2014 | spin_unlock_irq(&block->request_queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | } |
| 2016 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2017 | static int dasd_open(struct inode *inp, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | { |
| 2019 | struct gendisk *disk = inp->i_bdev->bd_disk; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2020 | struct dasd_block *block = disk->private_data; |
| 2021 | struct dasd_device *base = block->base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | int rc; |
| 2023 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2024 | atomic_inc(&block->open_count); |
| 2025 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | rc = -ENODEV; |
| 2027 | goto unlock; |
| 2028 | } |
| 2029 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2030 | if (!try_module_get(base->discipline->owner)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | rc = -EINVAL; |
| 2032 | goto unlock; |
| 2033 | } |
| 2034 | |
| 2035 | if (dasd_probeonly) { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2036 | DEV_MESSAGE(KERN_INFO, base, "%s", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | "No access to device due to probeonly mode"); |
| 2038 | rc = -EPERM; |
| 2039 | goto out; |
| 2040 | } |
| 2041 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2042 | if (base->state <= DASD_STATE_BASIC) { |
| 2043 | DBF_DEV_EVENT(DBF_ERR, base, " %s", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | " Cannot open unrecognized device"); |
| 2045 | rc = -ENODEV; |
| 2046 | goto out; |
| 2047 | } |
| 2048 | |
| 2049 | return 0; |
| 2050 | |
| 2051 | out: |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2052 | module_put(base->discipline->owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | unlock: |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2054 | atomic_dec(&block->open_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | return rc; |
| 2056 | } |
| 2057 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2058 | static int dasd_release(struct inode *inp, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | { |
| 2060 | struct gendisk *disk = inp->i_bdev->bd_disk; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2061 | struct dasd_block *block = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2063 | atomic_dec(&block->open_count); |
| 2064 | module_put(block->base->discipline->owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | return 0; |
| 2066 | } |
| 2067 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 2068 | /* |
| 2069 | * Return disk geometry. |
| 2070 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2071 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 2072 | { |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2073 | struct dasd_block *block; |
| 2074 | struct dasd_device *base; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 2075 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2076 | block = bdev->bd_disk->private_data; |
| 2077 | base = block->base; |
| 2078 | if (!block) |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 2079 | return -ENODEV; |
| 2080 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2081 | if (!base->discipline || |
| 2082 | !base->discipline->fill_geometry) |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 2083 | return -EINVAL; |
| 2084 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2085 | base->discipline->fill_geometry(block, geo); |
| 2086 | geo->start = get_start_sect(bdev) >> block->s2b_shift; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 2087 | return 0; |
| 2088 | } |
| 2089 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | struct block_device_operations |
| 2091 | dasd_device_operations = { |
| 2092 | .owner = THIS_MODULE, |
| 2093 | .open = dasd_open, |
| 2094 | .release = dasd_release, |
| 2095 | .ioctl = dasd_ioctl, |
Christoph Hellwig | 8262037 | 2006-01-09 20:52:12 -0800 | [diff] [blame] | 2096 | .compat_ioctl = dasd_compat_ioctl, |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 2097 | .getgeo = dasd_getgeo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | }; |
| 2099 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2100 | /******************************************************************************* |
| 2101 | * end of block device operations |
| 2102 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | |
| 2104 | static void |
| 2105 | dasd_exit(void) |
| 2106 | { |
| 2107 | #ifdef CONFIG_PROC_FS |
| 2108 | dasd_proc_exit(); |
| 2109 | #endif |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 2110 | dasd_eer_exit(); |
Horst Hummel | 6bb0e01 | 2005-07-27 11:45:03 -0700 | [diff] [blame] | 2111 | if (dasd_page_cache != NULL) { |
| 2112 | kmem_cache_destroy(dasd_page_cache); |
| 2113 | dasd_page_cache = NULL; |
| 2114 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | dasd_gendisk_exit(); |
| 2116 | dasd_devmap_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | if (dasd_debug_area != NULL) { |
| 2118 | debug_unregister(dasd_debug_area); |
| 2119 | dasd_debug_area = NULL; |
| 2120 | } |
| 2121 | } |
| 2122 | |
| 2123 | /* |
| 2124 | * SECTION: common functions for ccw_driver use |
| 2125 | */ |
| 2126 | |
Horst Hummel | 1c01b8a | 2006-01-06 00:19:15 -0800 | [diff] [blame] | 2127 | /* |
| 2128 | * Initial attempt at a probe function. this can be simplified once |
| 2129 | * the other detection code is gone. |
| 2130 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2131 | int dasd_generic_probe(struct ccw_device *cdev, |
| 2132 | struct dasd_discipline *discipline) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | { |
| 2134 | int ret; |
| 2135 | |
Horst Hummel | 4054557 | 2006-06-29 15:08:18 +0200 | [diff] [blame] | 2136 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
| 2137 | if (ret) { |
| 2138 | printk(KERN_WARNING |
| 2139 | "dasd_generic_probe: could not set ccw-device options " |
| 2140 | "for %s\n", cdev->dev.bus_id); |
| 2141 | return ret; |
| 2142 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | ret = dasd_add_sysfs_files(cdev); |
| 2144 | if (ret) { |
| 2145 | printk(KERN_WARNING |
| 2146 | "dasd_generic_probe: could not add sysfs entries " |
| 2147 | "for %s\n", cdev->dev.bus_id); |
Horst Hummel | 4054557 | 2006-06-29 15:08:18 +0200 | [diff] [blame] | 2148 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | } |
Horst Hummel | 4054557 | 2006-06-29 15:08:18 +0200 | [diff] [blame] | 2150 | cdev->handler = &dasd_int_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | |
Horst Hummel | 4054557 | 2006-06-29 15:08:18 +0200 | [diff] [blame] | 2152 | /* |
| 2153 | * Automatically online either all dasd devices (dasd_autodetect) |
| 2154 | * or all devices specified with dasd= parameters during |
| 2155 | * initial probe. |
| 2156 | */ |
| 2157 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || |
| 2158 | (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) |
| 2159 | ret = ccw_device_set_online(cdev); |
| 2160 | if (ret) |
| 2161 | printk(KERN_WARNING |
Stefan Haberland | de3e0da | 2008-01-26 14:11:08 +0100 | [diff] [blame] | 2162 | "dasd_generic_probe: could not initially " |
| 2163 | "online ccw-device %s; return code: %d\n", |
| 2164 | cdev->dev.bus_id, ret); |
| 2165 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | } |
| 2167 | |
Horst Hummel | 1c01b8a | 2006-01-06 00:19:15 -0800 | [diff] [blame] | 2168 | /* |
| 2169 | * This will one day be called from a global not_oper handler. |
| 2170 | * It is also used by driver_unregister during module unload. |
| 2171 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2172 | void dasd_generic_remove(struct ccw_device *cdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | { |
| 2174 | struct dasd_device *device; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2175 | struct dasd_block *block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | |
Horst Hummel | 59afda7 | 2005-05-16 21:53:39 -0700 | [diff] [blame] | 2177 | cdev->handler = NULL; |
| 2178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | dasd_remove_sysfs_files(cdev); |
| 2180 | device = dasd_device_from_cdev(cdev); |
| 2181 | if (IS_ERR(device)) |
| 2182 | return; |
| 2183 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| 2184 | /* Already doing offline processing */ |
| 2185 | dasd_put_device(device); |
| 2186 | return; |
| 2187 | } |
| 2188 | /* |
| 2189 | * This device is removed unconditionally. Set offline |
| 2190 | * flag to prevent dasd_open from opening it while it is |
| 2191 | * no quite down yet. |
| 2192 | */ |
| 2193 | dasd_set_target_state(device, DASD_STATE_NEW); |
| 2194 | /* dasd_delete_device destroys the device reference. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2195 | block = device->block; |
| 2196 | device->block = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | dasd_delete_device(device); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2198 | /* |
| 2199 | * life cycle of block is bound to device, so delete it after |
| 2200 | * device was safely removed |
| 2201 | */ |
| 2202 | if (block) |
| 2203 | dasd_free_block(block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | } |
| 2205 | |
Horst Hummel | 1c01b8a | 2006-01-06 00:19:15 -0800 | [diff] [blame] | 2206 | /* |
| 2207 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | * the device is detected for the first time and is supposed to be used |
Horst Hummel | 1c01b8a | 2006-01-06 00:19:15 -0800 | [diff] [blame] | 2209 | * or the user has started activation through sysfs. |
| 2210 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2211 | int dasd_generic_set_online(struct ccw_device *cdev, |
| 2212 | struct dasd_discipline *base_discipline) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | { |
Peter Oberparleiter | aa88861 | 2006-02-20 18:28:13 -0800 | [diff] [blame] | 2214 | struct dasd_discipline *discipline; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | struct dasd_device *device; |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 2216 | int rc; |
Horst Hummel | f24acd4 | 2005-05-01 08:58:59 -0700 | [diff] [blame] | 2217 | |
Horst Hummel | 4054557 | 2006-06-29 15:08:18 +0200 | [diff] [blame] | 2218 | /* first online clears initial online feature flag */ |
| 2219 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2220 | device = dasd_create_device(cdev); |
| 2221 | if (IS_ERR(device)) |
| 2222 | return PTR_ERR(device); |
| 2223 | |
Peter Oberparleiter | aa88861 | 2006-02-20 18:28:13 -0800 | [diff] [blame] | 2224 | discipline = base_discipline; |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 2225 | if (device->features & DASD_FEATURE_USEDIAG) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | if (!dasd_diag_discipline_pointer) { |
| 2227 | printk (KERN_WARNING |
| 2228 | "dasd_generic couldn't online device %s " |
| 2229 | "- discipline DIAG not available\n", |
| 2230 | cdev->dev.bus_id); |
| 2231 | dasd_delete_device(device); |
| 2232 | return -ENODEV; |
| 2233 | } |
| 2234 | discipline = dasd_diag_discipline_pointer; |
| 2235 | } |
Peter Oberparleiter | aa88861 | 2006-02-20 18:28:13 -0800 | [diff] [blame] | 2236 | if (!try_module_get(base_discipline->owner)) { |
| 2237 | dasd_delete_device(device); |
| 2238 | return -EINVAL; |
| 2239 | } |
| 2240 | if (!try_module_get(discipline->owner)) { |
| 2241 | module_put(base_discipline->owner); |
| 2242 | dasd_delete_device(device); |
| 2243 | return -EINVAL; |
| 2244 | } |
| 2245 | device->base_discipline = base_discipline; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | device->discipline = discipline; |
| 2247 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2248 | /* check_device will allocate block device if necessary */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | rc = discipline->check_device(device); |
| 2250 | if (rc) { |
| 2251 | printk (KERN_WARNING |
| 2252 | "dasd_generic couldn't online device %s " |
| 2253 | "with discipline %s rc=%i\n", |
| 2254 | cdev->dev.bus_id, discipline->name, rc); |
Peter Oberparleiter | aa88861 | 2006-02-20 18:28:13 -0800 | [diff] [blame] | 2255 | module_put(discipline->owner); |
| 2256 | module_put(base_discipline->owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | dasd_delete_device(device); |
| 2258 | return rc; |
| 2259 | } |
| 2260 | |
| 2261 | dasd_set_target_state(device, DASD_STATE_ONLINE); |
| 2262 | if (device->state <= DASD_STATE_KNOWN) { |
| 2263 | printk (KERN_WARNING |
| 2264 | "dasd_generic discipline not found for %s\n", |
| 2265 | cdev->dev.bus_id); |
| 2266 | rc = -ENODEV; |
| 2267 | dasd_set_target_state(device, DASD_STATE_NEW); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2268 | if (device->block) |
| 2269 | dasd_free_block(device->block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | dasd_delete_device(device); |
| 2271 | } else |
| 2272 | pr_debug("dasd_generic device %s found\n", |
| 2273 | cdev->dev.bus_id); |
| 2274 | |
| 2275 | /* FIXME: we have to wait for the root device but we don't want |
| 2276 | * to wait for each single device but for all at once. */ |
| 2277 | wait_event(dasd_init_waitq, _wait_for_device(device)); |
| 2278 | |
| 2279 | dasd_put_device(device); |
| 2280 | |
| 2281 | return rc; |
| 2282 | } |
| 2283 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2284 | int dasd_generic_set_offline(struct ccw_device *cdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | { |
| 2286 | struct dasd_device *device; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2287 | struct dasd_block *block; |
Horst Hummel | dafd87a | 2006-04-10 22:53:47 -0700 | [diff] [blame] | 2288 | int max_count, open_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2289 | |
| 2290 | device = dasd_device_from_cdev(cdev); |
| 2291 | if (IS_ERR(device)) |
| 2292 | return PTR_ERR(device); |
| 2293 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| 2294 | /* Already doing offline processing */ |
| 2295 | dasd_put_device(device); |
| 2296 | return 0; |
| 2297 | } |
| 2298 | /* |
| 2299 | * We must make sure that this device is currently not in use. |
| 2300 | * The open_count is increased for every opener, that includes |
| 2301 | * the blkdev_get in dasd_scan_partitions. We are only interested |
| 2302 | * in the other openers. |
| 2303 | */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2304 | if (device->block) { |
| 2305 | struct dasd_block *block = device->block; |
| 2306 | max_count = block->bdev ? 0 : -1; |
| 2307 | open_count = (int) atomic_read(&block->open_count); |
| 2308 | if (open_count > max_count) { |
| 2309 | if (open_count > 0) |
| 2310 | printk(KERN_WARNING "Can't offline dasd " |
| 2311 | "device with open count = %i.\n", |
| 2312 | open_count); |
| 2313 | else |
| 2314 | printk(KERN_WARNING "%s", |
| 2315 | "Can't offline dasd device due " |
| 2316 | "to internal use\n"); |
| 2317 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
| 2318 | dasd_put_device(device); |
| 2319 | return -EBUSY; |
| 2320 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | } |
| 2322 | dasd_set_target_state(device, DASD_STATE_NEW); |
| 2323 | /* dasd_delete_device destroys the device reference. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2324 | block = device->block; |
| 2325 | device->block = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | dasd_delete_device(device); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2327 | /* |
| 2328 | * life cycle of block is bound to device, so delete it after |
| 2329 | * device was safely removed |
| 2330 | */ |
| 2331 | if (block) |
| 2332 | dasd_free_block(block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | return 0; |
| 2334 | } |
| 2335 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2336 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | { |
| 2338 | struct dasd_device *device; |
| 2339 | struct dasd_ccw_req *cqr; |
| 2340 | unsigned long flags; |
| 2341 | int ret; |
| 2342 | |
| 2343 | device = dasd_device_from_cdev(cdev); |
| 2344 | if (IS_ERR(device)) |
| 2345 | return 0; |
| 2346 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 2347 | ret = 0; |
| 2348 | switch (event) { |
| 2349 | case CIO_GONE: |
| 2350 | case CIO_NO_PATH: |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 2351 | /* First of all call extended error reporting. */ |
| 2352 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); |
| 2353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | if (device->state < DASD_STATE_BASIC) |
| 2355 | break; |
| 2356 | /* Device is active. We want to keep it. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2357 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
| 2358 | if (cqr->status == DASD_CQR_IN_IO) { |
| 2359 | cqr->status = DASD_CQR_QUEUED; |
| 2360 | cqr->retries++; |
| 2361 | } |
| 2362 | device->stopped |= DASD_STOPPED_DC_WAIT; |
| 2363 | dasd_device_clear_timer(device); |
| 2364 | dasd_schedule_device_bh(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | ret = 1; |
| 2366 | break; |
| 2367 | case CIO_OPER: |
| 2368 | /* FIXME: add a sanity check. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2369 | device->stopped &= ~DASD_STOPPED_DC_WAIT; |
| 2370 | dasd_schedule_device_bh(device); |
| 2371 | if (device->block) |
| 2372 | dasd_schedule_block_bh(device->block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | ret = 1; |
| 2374 | break; |
| 2375 | } |
| 2376 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 2377 | dasd_put_device(device); |
| 2378 | return ret; |
| 2379 | } |
| 2380 | |
Heiko Carstens | 763968e | 2007-05-10 15:45:46 +0200 | [diff] [blame] | 2381 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
| 2382 | void *rdc_buffer, |
| 2383 | int rdc_buffer_size, |
| 2384 | char *magic) |
Cornelia Huck | 17283b5 | 2007-05-04 18:47:51 +0200 | [diff] [blame] | 2385 | { |
| 2386 | struct dasd_ccw_req *cqr; |
| 2387 | struct ccw1 *ccw; |
| 2388 | |
| 2389 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); |
| 2390 | |
| 2391 | if (IS_ERR(cqr)) { |
| 2392 | DEV_MESSAGE(KERN_WARNING, device, "%s", |
| 2393 | "Could not allocate RDC request"); |
| 2394 | return cqr; |
| 2395 | } |
| 2396 | |
| 2397 | ccw = cqr->cpaddr; |
| 2398 | ccw->cmd_code = CCW_CMD_RDC; |
| 2399 | ccw->cda = (__u32)(addr_t)rdc_buffer; |
| 2400 | ccw->count = rdc_buffer_size; |
| 2401 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2402 | cqr->startdev = device; |
| 2403 | cqr->memdev = device; |
Cornelia Huck | 17283b5 | 2007-05-04 18:47:51 +0200 | [diff] [blame] | 2404 | cqr->expires = 10*HZ; |
| 2405 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
| 2406 | cqr->retries = 2; |
| 2407 | cqr->buildclk = get_clock(); |
| 2408 | cqr->status = DASD_CQR_FILLED; |
| 2409 | return cqr; |
| 2410 | } |
| 2411 | |
| 2412 | |
| 2413 | int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, |
| 2414 | void **rdc_buffer, int rdc_buffer_size) |
| 2415 | { |
| 2416 | int ret; |
| 2417 | struct dasd_ccw_req *cqr; |
| 2418 | |
| 2419 | cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size, |
| 2420 | magic); |
| 2421 | if (IS_ERR(cqr)) |
| 2422 | return PTR_ERR(cqr); |
| 2423 | |
| 2424 | ret = dasd_sleep_on(cqr); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2425 | dasd_sfree_request(cqr, cqr->memdev); |
Cornelia Huck | 17283b5 | 2007-05-04 18:47:51 +0200 | [diff] [blame] | 2426 | return ret; |
| 2427 | } |
Cornelia Huck | aaff0f6 | 2007-05-10 15:45:45 +0200 | [diff] [blame] | 2428 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 2429 | |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2430 | static int __init dasd_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | { |
| 2432 | int rc; |
| 2433 | |
| 2434 | init_waitqueue_head(&dasd_init_waitq); |
Horst Hummel | 8f61701 | 2006-08-30 14:33:33 +0200 | [diff] [blame] | 2435 | init_waitqueue_head(&dasd_flush_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | |
| 2437 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2438 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof(long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2439 | if (dasd_debug_area == NULL) { |
| 2440 | rc = -ENOMEM; |
| 2441 | goto failed; |
| 2442 | } |
| 2443 | debug_register_view(dasd_debug_area, &debug_sprintf_view); |
Horst Hummel | b0035f1 | 2006-09-20 15:59:07 +0200 | [diff] [blame] | 2444 | debug_set_level(dasd_debug_area, DBF_WARNING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | |
| 2446 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); |
| 2447 | |
| 2448 | dasd_diag_discipline_pointer = NULL; |
| 2449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | rc = dasd_devmap_init(); |
| 2451 | if (rc) |
| 2452 | goto failed; |
| 2453 | rc = dasd_gendisk_init(); |
| 2454 | if (rc) |
| 2455 | goto failed; |
| 2456 | rc = dasd_parse(); |
| 2457 | if (rc) |
| 2458 | goto failed; |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 2459 | rc = dasd_eer_init(); |
| 2460 | if (rc) |
| 2461 | goto failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | #ifdef CONFIG_PROC_FS |
| 2463 | rc = dasd_proc_init(); |
| 2464 | if (rc) |
| 2465 | goto failed; |
| 2466 | #endif |
| 2467 | |
| 2468 | return 0; |
| 2469 | failed: |
| 2470 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); |
| 2471 | dasd_exit(); |
| 2472 | return rc; |
| 2473 | } |
| 2474 | |
| 2475 | module_init(dasd_init); |
| 2476 | module_exit(dasd_exit); |
| 2477 | |
| 2478 | EXPORT_SYMBOL(dasd_debug_area); |
| 2479 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); |
| 2480 | |
| 2481 | EXPORT_SYMBOL(dasd_add_request_head); |
| 2482 | EXPORT_SYMBOL(dasd_add_request_tail); |
| 2483 | EXPORT_SYMBOL(dasd_cancel_req); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2484 | EXPORT_SYMBOL(dasd_device_clear_timer); |
| 2485 | EXPORT_SYMBOL(dasd_block_clear_timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | EXPORT_SYMBOL(dasd_enable_device); |
| 2487 | EXPORT_SYMBOL(dasd_int_handler); |
| 2488 | EXPORT_SYMBOL(dasd_kfree_request); |
| 2489 | EXPORT_SYMBOL(dasd_kick_device); |
| 2490 | EXPORT_SYMBOL(dasd_kmalloc_request); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2491 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
| 2492 | EXPORT_SYMBOL(dasd_schedule_block_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | EXPORT_SYMBOL(dasd_set_target_state); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2494 | EXPORT_SYMBOL(dasd_device_set_timer); |
| 2495 | EXPORT_SYMBOL(dasd_block_set_timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | EXPORT_SYMBOL(dasd_sfree_request); |
| 2497 | EXPORT_SYMBOL(dasd_sleep_on); |
| 2498 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); |
| 2499 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); |
| 2500 | EXPORT_SYMBOL(dasd_smalloc_request); |
| 2501 | EXPORT_SYMBOL(dasd_start_IO); |
| 2502 | EXPORT_SYMBOL(dasd_term_IO); |
| 2503 | |
| 2504 | EXPORT_SYMBOL_GPL(dasd_generic_probe); |
| 2505 | EXPORT_SYMBOL_GPL(dasd_generic_remove); |
| 2506 | EXPORT_SYMBOL_GPL(dasd_generic_notify); |
| 2507 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); |
| 2508 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 2509 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
| 2510 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); |
| 2511 | EXPORT_SYMBOL_GPL(dasd_alloc_block); |
| 2512 | EXPORT_SYMBOL_GPL(dasd_free_block); |