Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/cio/chsc.c |
| 3 | * S/390 common I/O routines -- channel subsystem call |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, |
| 6 | * IBM Corporation |
| 7 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
Cornelia Huck | 4ce3b30 | 2006-01-14 13:21:04 -0800 | [diff] [blame] | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Arnd Bergmann (arndb@de.ibm.com) |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/slab.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/device.h> |
| 16 | |
| 17 | #include <asm/cio.h> |
| 18 | |
| 19 | #include "css.h" |
| 20 | #include "cio.h" |
| 21 | #include "cio_debug.h" |
| 22 | #include "ioasm.h" |
| 23 | #include "chsc.h" |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | static void *sei_page; |
| 26 | |
| 27 | static int new_channel_path(int chpid); |
| 28 | |
| 29 | static inline void |
| 30 | set_chp_logically_online(int chp, int onoff) |
| 31 | { |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 32 | css[0]->chps[chp]->state = onoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | static int |
| 36 | get_chp_status(int chp) |
| 37 | { |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 38 | return (css[0]->chps[chp] ? css[0]->chps[chp]->state : -ENODEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | } |
| 40 | |
| 41 | void |
| 42 | chsc_validate_chpids(struct subchannel *sch) |
| 43 | { |
| 44 | int mask, chp; |
| 45 | |
| 46 | for (chp = 0; chp <= 7; chp++) { |
| 47 | mask = 0x80 >> chp; |
| 48 | if (!get_chp_status(sch->schib.pmcw.chpid[chp])) |
| 49 | /* disable using this path */ |
| 50 | sch->opm &= ~mask; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | void |
| 55 | chpid_is_actually_online(int chp) |
| 56 | { |
| 57 | int state; |
| 58 | |
| 59 | state = get_chp_status(chp); |
| 60 | if (state < 0) { |
| 61 | need_rescan = 1; |
| 62 | queue_work(slow_path_wq, &slow_path_work); |
| 63 | } else |
| 64 | WARN_ON(!state); |
| 65 | } |
| 66 | |
| 67 | /* FIXME: this is _always_ called for every subchannel. shouldn't we |
| 68 | * process more than one at a time? */ |
| 69 | static int |
| 70 | chsc_get_sch_desc_irq(struct subchannel *sch, void *page) |
| 71 | { |
| 72 | int ccode, j; |
| 73 | |
| 74 | struct { |
| 75 | struct chsc_header request; |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 76 | u16 reserved1a:10; |
| 77 | u16 ssid:2; |
| 78 | u16 reserved1b:4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | u16 f_sch; /* first subchannel */ |
| 80 | u16 reserved2; |
| 81 | u16 l_sch; /* last subchannel */ |
| 82 | u32 reserved3; |
| 83 | struct chsc_header response; |
| 84 | u32 reserved4; |
| 85 | u8 sch_valid : 1; |
| 86 | u8 dev_valid : 1; |
| 87 | u8 st : 3; /* subchannel type */ |
| 88 | u8 zeroes : 3; |
| 89 | u8 unit_addr; /* unit address */ |
| 90 | u16 devno; /* device number */ |
| 91 | u8 path_mask; |
| 92 | u8 fla_valid_mask; |
| 93 | u16 sch; /* subchannel */ |
| 94 | u8 chpid[8]; /* chpids 0-7 */ |
| 95 | u16 fla[8]; /* full link addresses 0-7 */ |
| 96 | } *ssd_area; |
| 97 | |
| 98 | ssd_area = page; |
| 99 | |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 100 | ssd_area->request.length = 0x0010; |
| 101 | ssd_area->request.code = 0x0004; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 103 | ssd_area->ssid = sch->schid.ssid; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 104 | ssd_area->f_sch = sch->schid.sch_no; |
| 105 | ssd_area->l_sch = sch->schid.sch_no; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
| 107 | ccode = chsc(ssd_area); |
| 108 | if (ccode > 0) { |
| 109 | pr_debug("chsc returned with ccode = %d\n", ccode); |
| 110 | return (ccode == 3) ? -ENODEV : -EBUSY; |
| 111 | } |
| 112 | |
| 113 | switch (ssd_area->response.code) { |
| 114 | case 0x0001: /* everything ok */ |
| 115 | break; |
| 116 | case 0x0002: |
| 117 | CIO_CRW_EVENT(2, "Invalid command!\n"); |
| 118 | return -EINVAL; |
| 119 | case 0x0003: |
| 120 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); |
| 121 | return -EINVAL; |
| 122 | case 0x0004: |
| 123 | CIO_CRW_EVENT(2, "Model does not provide ssd\n"); |
| 124 | return -EOPNOTSUPP; |
| 125 | default: |
| 126 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", |
| 127 | ssd_area->response.code); |
| 128 | return -EIO; |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * ssd_area->st stores the type of the detected |
| 133 | * subchannel, with the following definitions: |
| 134 | * |
| 135 | * 0: I/O subchannel: All fields have meaning |
| 136 | * 1: CHSC subchannel: Only sch_val, st and sch |
| 137 | * have meaning |
| 138 | * 2: Message subchannel: All fields except unit_addr |
| 139 | * have meaning |
| 140 | * 3: ADM subchannel: Only sch_val, st and sch |
| 141 | * have meaning |
| 142 | * |
| 143 | * Other types are currently undefined. |
| 144 | */ |
| 145 | if (ssd_area->st > 3) { /* uhm, that looks strange... */ |
| 146 | CIO_CRW_EVENT(0, "Strange subchannel type %d" |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 147 | " for sch 0.%x.%04x\n", ssd_area->st, |
| 148 | sch->schid.ssid, sch->schid.sch_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | /* |
| 150 | * There may have been a new subchannel type defined in the |
| 151 | * time since this code was written; since we don't know which |
| 152 | * fields have meaning and what to do with it we just jump out |
| 153 | */ |
| 154 | return 0; |
| 155 | } else { |
| 156 | const char *type[4] = {"I/O", "chsc", "message", "ADM"}; |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 157 | CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n", |
| 158 | sch->schid.ssid, sch->schid.sch_no, |
| 159 | type[ssd_area->st]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | sch->ssd_info.valid = 1; |
| 162 | sch->ssd_info.type = ssd_area->st; |
| 163 | } |
| 164 | |
| 165 | if (ssd_area->st == 0 || ssd_area->st == 2) { |
| 166 | for (j = 0; j < 8; j++) { |
| 167 | if (!((0x80 >> j) & ssd_area->path_mask & |
| 168 | ssd_area->fla_valid_mask)) |
| 169 | continue; |
| 170 | sch->ssd_info.chpid[j] = ssd_area->chpid[j]; |
| 171 | sch->ssd_info.fla[j] = ssd_area->fla[j]; |
| 172 | } |
| 173 | } |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | int |
| 178 | css_get_ssd_info(struct subchannel *sch) |
| 179 | { |
| 180 | int ret; |
| 181 | void *page; |
| 182 | |
| 183 | page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 184 | if (!page) |
| 185 | return -ENOMEM; |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 186 | spin_lock_irq(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | ret = chsc_get_sch_desc_irq(sch, page); |
| 188 | if (ret) { |
| 189 | static int cio_chsc_err_msg; |
| 190 | |
| 191 | if (!cio_chsc_err_msg) { |
| 192 | printk(KERN_ERR |
| 193 | "chsc_get_sch_descriptions:" |
| 194 | " Error %d while doing chsc; " |
| 195 | "processing some machine checks may " |
| 196 | "not work\n", ret); |
| 197 | cio_chsc_err_msg = 1; |
| 198 | } |
| 199 | } |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 200 | spin_unlock_irq(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | free_page((unsigned long)page); |
| 202 | if (!ret) { |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 203 | int j, chpid, mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* Allocate channel path structures, if needed. */ |
| 205 | for (j = 0; j < 8; j++) { |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 206 | mask = 0x80 >> j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | chpid = sch->ssd_info.chpid[j]; |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 208 | if ((sch->schib.pmcw.pim & mask) && |
| 209 | (get_chp_status(chpid) < 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | new_channel_path(chpid); |
| 211 | } |
| 212 | } |
| 213 | return ret; |
| 214 | } |
| 215 | |
| 216 | static int |
| 217 | s390_subchannel_remove_chpid(struct device *dev, void *data) |
| 218 | { |
| 219 | int j; |
| 220 | int mask; |
| 221 | struct subchannel *sch; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 222 | struct channel_path *chpid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | struct schib schib; |
| 224 | |
| 225 | sch = to_subchannel(dev); |
| 226 | chpid = data; |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 227 | for (j = 0; j < 8; j++) { |
| 228 | mask = 0x80 >> j; |
| 229 | if ((sch->schib.pmcw.pim & mask) && |
| 230 | (sch->schib.pmcw.chpid[j] == chpid->id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | break; |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | if (j >= 8) |
| 234 | return 0; |
| 235 | |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 236 | spin_lock_irq(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 238 | stsch(sch->schid, &schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | if (!schib.pmcw.dnv) |
| 240 | goto out_unreg; |
| 241 | memcpy(&sch->schib, &schib, sizeof(struct schib)); |
| 242 | /* Check for single path devices. */ |
| 243 | if (sch->schib.pmcw.pim == 0x80) |
| 244 | goto out_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Peter Oberparleiter | 329b785 | 2006-04-27 18:40:02 -0700 | [diff] [blame] | 246 | if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) && |
| 247 | (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) && |
Cornelia Huck | b4f7b1e | 2006-06-29 15:03:35 +0200 | [diff] [blame] | 248 | (sch->schib.pmcw.lpum == mask)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | int cc; |
| 250 | |
| 251 | cc = cio_clear(sch); |
| 252 | if (cc == -ENODEV) |
| 253 | goto out_unreg; |
Cornelia Huck | d23861f | 2006-12-04 15:41:04 +0100 | [diff] [blame] | 254 | /* Request retry of internal operation. */ |
| 255 | device_set_intretry(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | /* Call handler. */ |
| 257 | if (sch->driver && sch->driver->termination) |
| 258 | sch->driver->termination(&sch->dev); |
| 259 | goto out_unlock; |
| 260 | } |
| 261 | |
| 262 | /* trigger path verification. */ |
| 263 | if (sch->driver && sch->driver->verify) |
| 264 | sch->driver->verify(&sch->dev); |
Peter Oberparleiter | 28bdc6f | 2006-09-20 15:59:59 +0200 | [diff] [blame] | 265 | else if (sch->lpm == mask) |
Peter Oberparleiter | 3b88508 | 2006-08-30 14:33:37 +0200 | [diff] [blame] | 266 | goto out_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | out_unlock: |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 268 | spin_unlock_irq(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return 0; |
| 270 | out_unreg: |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 271 | spin_unlock_irq(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | sch->lpm = 0; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 273 | if (css_enqueue_subchannel_slow(sch->schid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | css_clear_subchannel_slow_list(); |
| 275 | need_rescan = 1; |
| 276 | } |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static inline void |
| 281 | s390_set_chpid_offline( __u8 chpid) |
| 282 | { |
| 283 | char dbf_txt[15]; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 284 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | sprintf(dbf_txt, "chpr%x", chpid); |
| 287 | CIO_TRACE_EVENT(2, dbf_txt); |
| 288 | |
| 289 | if (get_chp_status(chpid) <= 0) |
| 290 | return; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 291 | dev = get_device(&css[0]->chps[chpid]->dev); |
| 292 | bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | s390_subchannel_remove_chpid); |
| 294 | |
| 295 | if (need_rescan || css_slow_subchannels_exist()) |
| 296 | queue_work(slow_path_wq, &slow_path_work); |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 297 | put_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 300 | struct res_acc_data { |
| 301 | struct channel_path *chp; |
| 302 | u32 fla_mask; |
| 303 | u16 fla; |
| 304 | }; |
| 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | static int |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 307 | s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
| 309 | int found; |
| 310 | int chp; |
| 311 | int ccode; |
| 312 | |
| 313 | found = 0; |
| 314 | for (chp = 0; chp <= 7; chp++) |
| 315 | /* |
| 316 | * check if chpid is in information updated by ssd |
| 317 | */ |
| 318 | if (sch->ssd_info.valid && |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 319 | sch->ssd_info.chpid[chp] == res_data->chp->id && |
| 320 | (sch->ssd_info.fla[chp] & res_data->fla_mask) |
| 321 | == res_data->fla) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | found = 1; |
| 323 | break; |
| 324 | } |
| 325 | |
| 326 | if (found == 0) |
| 327 | return 0; |
| 328 | |
| 329 | /* |
| 330 | * Do a stsch to update our subchannel structure with the |
| 331 | * new path information and eventually check for logically |
| 332 | * offline chpids. |
| 333 | */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 334 | ccode = stsch(sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | if (ccode > 0) |
| 336 | return 0; |
| 337 | |
| 338 | return 0x80 >> chp; |
| 339 | } |
| 340 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 341 | static inline int |
| 342 | s390_process_res_acc_new_sch(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 344 | struct schib schib; |
| 345 | int ret; |
| 346 | /* |
| 347 | * We don't know the device yet, but since a path |
| 348 | * may be available now to the device we'll have |
| 349 | * to do recognition again. |
| 350 | * Since we don't have any idea about which chpid |
| 351 | * that beast may be on we'll have to do a stsch |
| 352 | * on all devices, grr... |
| 353 | */ |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 354 | if (stsch_err(schid, &schib)) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 355 | /* We're through */ |
| 356 | return need_rescan ? -EAGAIN : -ENXIO; |
| 357 | |
| 358 | /* Put it on the slow path. */ |
| 359 | ret = css_enqueue_subchannel_slow(schid); |
| 360 | if (ret) { |
| 361 | css_clear_subchannel_slow_list(); |
| 362 | need_rescan = 1; |
| 363 | return -EAGAIN; |
| 364 | } |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static int |
| 369 | __s390_process_res_acc(struct subchannel_id schid, void *data) |
| 370 | { |
| 371 | int chp_mask, old_lpm; |
| 372 | struct res_acc_data *res_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | struct subchannel *sch; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 374 | |
Cornelia Huck | 12975ae | 2006-10-11 15:31:47 +0200 | [diff] [blame] | 375 | res_data = data; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 376 | sch = get_subchannel_by_schid(schid); |
| 377 | if (!sch) |
| 378 | /* Check if a subchannel is newly available. */ |
| 379 | return s390_process_res_acc_new_sch(schid); |
| 380 | |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 381 | spin_lock_irq(sch->lock); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 382 | |
| 383 | chp_mask = s390_process_res_acc_sch(res_data, sch); |
| 384 | |
| 385 | if (chp_mask == 0) { |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 386 | spin_unlock_irq(sch->lock); |
Peter Oberparleiter | dd9963f | 2006-09-20 15:59:54 +0200 | [diff] [blame] | 387 | put_device(&sch->dev); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 388 | return 0; |
| 389 | } |
| 390 | old_lpm = sch->lpm; |
| 391 | sch->lpm = ((sch->schib.pmcw.pim & |
| 392 | sch->schib.pmcw.pam & |
| 393 | sch->schib.pmcw.pom) |
| 394 | | chp_mask) & sch->opm; |
| 395 | if (!old_lpm && sch->lpm) |
| 396 | device_trigger_reprobe(sch); |
| 397 | else if (sch->driver && sch->driver->verify) |
| 398 | sch->driver->verify(&sch->dev); |
| 399 | |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 400 | spin_unlock_irq(sch->lock); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 401 | put_device(&sch->dev); |
Peter Oberparleiter | dd9963f | 2006-09-20 15:59:54 +0200 | [diff] [blame] | 402 | return 0; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | |
| 406 | static int |
| 407 | s390_process_res_acc (struct res_acc_data *res_data) |
| 408 | { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 409 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | char dbf_txt[15]; |
| 411 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 412 | sprintf(dbf_txt, "accpr%x", res_data->chp->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | CIO_TRACE_EVENT( 2, dbf_txt); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 414 | if (res_data->fla != 0) { |
| 415 | sprintf(dbf_txt, "fla%x", res_data->fla); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | CIO_TRACE_EVENT( 2, dbf_txt); |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * I/O resources may have become accessible. |
| 421 | * Scan through all subchannels that may be concerned and |
| 422 | * do a validation on those. |
| 423 | * The more information we have (info), the less scanning |
| 424 | * will we have to do. |
| 425 | */ |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 426 | rc = for_each_subchannel(__s390_process_res_acc, res_data); |
| 427 | if (css_slow_subchannels_exist()) |
| 428 | rc = -EAGAIN; |
| 429 | else if (rc != -EAGAIN) |
| 430 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | return rc; |
| 432 | } |
| 433 | |
| 434 | static int |
| 435 | __get_chpid_from_lir(void *data) |
| 436 | { |
| 437 | struct lir { |
| 438 | u8 iq; |
| 439 | u8 ic; |
| 440 | u16 sci; |
| 441 | /* incident-node descriptor */ |
| 442 | u32 indesc[28]; |
| 443 | /* attached-node descriptor */ |
| 444 | u32 andesc[28]; |
| 445 | /* incident-specific information */ |
| 446 | u32 isinfo[28]; |
| 447 | } *lir; |
| 448 | |
Cornelia Huck | 12975ae | 2006-10-11 15:31:47 +0200 | [diff] [blame] | 449 | lir = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | if (!(lir->iq&0x80)) |
| 451 | /* NULL link incident record */ |
| 452 | return -EINVAL; |
| 453 | if (!(lir->indesc[0]&0xc0000000)) |
| 454 | /* node descriptor not valid */ |
| 455 | return -EINVAL; |
| 456 | if (!(lir->indesc[0]&0x10000000)) |
| 457 | /* don't handle device-type nodes - FIXME */ |
| 458 | return -EINVAL; |
| 459 | /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */ |
| 460 | |
| 461 | return (u16) (lir->indesc[0]&0x000000ff); |
| 462 | } |
| 463 | |
| 464 | int |
| 465 | chsc_process_crw(void) |
| 466 | { |
| 467 | int chpid, ret; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 468 | struct res_acc_data res_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | struct { |
| 470 | struct chsc_header request; |
| 471 | u32 reserved1; |
| 472 | u32 reserved2; |
| 473 | u32 reserved3; |
| 474 | struct chsc_header response; |
| 475 | u32 reserved4; |
| 476 | u8 flags; |
| 477 | u8 vf; /* validity flags */ |
| 478 | u8 rs; /* reporting source */ |
| 479 | u8 cc; /* content code */ |
| 480 | u16 fla; /* full link address */ |
| 481 | u16 rsid; /* reporting source id */ |
| 482 | u32 reserved5; |
| 483 | u32 reserved6; |
| 484 | u32 ccdf[96]; /* content-code dependent field */ |
| 485 | /* ccdf has to be big enough for a link-incident record */ |
| 486 | } *sei_area; |
| 487 | |
| 488 | if (!sei_page) |
| 489 | return 0; |
| 490 | /* |
| 491 | * build the chsc request block for store event information |
| 492 | * and do the call |
| 493 | * This function is only called by the machine check handler thread, |
| 494 | * so we don't need locking for the sei_page. |
| 495 | */ |
| 496 | sei_area = sei_page; |
| 497 | |
| 498 | CIO_TRACE_EVENT( 2, "prcss"); |
| 499 | ret = 0; |
| 500 | do { |
| 501 | int ccode, status; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 502 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | memset(sei_area, 0, sizeof(*sei_area)); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 504 | memset(&res_data, 0, sizeof(struct res_acc_data)); |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 505 | sei_area->request.length = 0x0010; |
| 506 | sei_area->request.code = 0x000e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
| 508 | ccode = chsc(sei_area); |
| 509 | if (ccode > 0) |
| 510 | return 0; |
| 511 | |
| 512 | switch (sei_area->response.code) { |
| 513 | /* for debug purposes, check for problems */ |
| 514 | case 0x0001: |
| 515 | CIO_CRW_EVENT(4, "chsc_process_crw: event information " |
| 516 | "successfully stored\n"); |
| 517 | break; /* everything ok */ |
| 518 | case 0x0002: |
| 519 | CIO_CRW_EVENT(2, |
| 520 | "chsc_process_crw: invalid command!\n"); |
| 521 | return 0; |
| 522 | case 0x0003: |
| 523 | CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc " |
| 524 | "request block!\n"); |
| 525 | return 0; |
| 526 | case 0x0005: |
| 527 | CIO_CRW_EVENT(2, "chsc_process_crw: no event " |
| 528 | "information stored\n"); |
| 529 | return 0; |
| 530 | default: |
| 531 | CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n", |
| 532 | sei_area->response.code); |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /* Check if we might have lost some information. */ |
| 537 | if (sei_area->flags & 0x40) |
| 538 | CIO_CRW_EVENT(2, "chsc_process_crw: Event information " |
| 539 | "has been lost due to overflow!\n"); |
| 540 | |
| 541 | if (sei_area->rs != 4) { |
| 542 | CIO_CRW_EVENT(2, "chsc_process_crw: reporting source " |
| 543 | "(%04X) isn't a chpid!\n", |
| 544 | sei_area->rsid); |
| 545 | continue; |
| 546 | } |
| 547 | |
| 548 | /* which kind of information was stored? */ |
| 549 | switch (sei_area->cc) { |
| 550 | case 1: /* link incident*/ |
| 551 | CIO_CRW_EVENT(4, "chsc_process_crw: " |
| 552 | "channel subsystem reports link incident," |
| 553 | " reporting source is chpid %x\n", |
| 554 | sei_area->rsid); |
| 555 | chpid = __get_chpid_from_lir(sei_area->ccdf); |
| 556 | if (chpid < 0) |
| 557 | CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n", |
| 558 | __FUNCTION__); |
| 559 | else |
| 560 | s390_set_chpid_offline(chpid); |
| 561 | break; |
| 562 | |
| 563 | case 2: /* i/o resource accessibiliy */ |
| 564 | CIO_CRW_EVENT(4, "chsc_process_crw: " |
| 565 | "channel subsystem reports some I/O " |
| 566 | "devices may have become accessible\n"); |
| 567 | pr_debug("Data received after sei: \n"); |
| 568 | pr_debug("Validity flags: %x\n", sei_area->vf); |
| 569 | |
| 570 | /* allocate a new channel path structure, if needed */ |
| 571 | status = get_chp_status(sei_area->rsid); |
| 572 | if (status < 0) |
| 573 | new_channel_path(sei_area->rsid); |
| 574 | else if (!status) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 575 | break; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 576 | dev = get_device(&css[0]->chps[sei_area->rsid]->dev); |
| 577 | res_data.chp = to_channelpath(dev); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 578 | pr_debug("chpid: %x", sei_area->rsid); |
| 579 | if ((sei_area->vf & 0xc0) != 0) { |
| 580 | res_data.fla = sei_area->fla; |
| 581 | if ((sei_area->vf & 0xc0) == 0xc0) { |
| 582 | pr_debug(" full link addr: %x", |
| 583 | sei_area->fla); |
| 584 | res_data.fla_mask = 0xffff; |
| 585 | } else { |
| 586 | pr_debug(" link addr: %x", |
| 587 | sei_area->fla); |
| 588 | res_data.fla_mask = 0xff00; |
| 589 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | } |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 591 | ret = s390_process_res_acc(&res_data); |
| 592 | pr_debug("\n\n"); |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 593 | put_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | break; |
| 595 | |
| 596 | default: /* other stuff */ |
| 597 | CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n", |
| 598 | sei_area->cc); |
| 599 | break; |
| 600 | } |
| 601 | } while (sei_area->flags & 0x80); |
| 602 | return ret; |
| 603 | } |
| 604 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 605 | static inline int |
| 606 | __chp_add_new_sch(struct subchannel_id schid) |
| 607 | { |
| 608 | struct schib schib; |
| 609 | int ret; |
| 610 | |
Cornelia Huck | 758976f | 2007-02-05 21:17:36 +0100 | [diff] [blame^] | 611 | if (stsch_err(schid, &schib)) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 612 | /* We're through */ |
| 613 | return need_rescan ? -EAGAIN : -ENXIO; |
| 614 | |
| 615 | /* Put it on the slow path. */ |
| 616 | ret = css_enqueue_subchannel_slow(schid); |
| 617 | if (ret) { |
| 618 | css_clear_subchannel_slow_list(); |
| 619 | need_rescan = 1; |
| 620 | return -EAGAIN; |
| 621 | } |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | |
| 626 | static int |
| 627 | __chp_add(struct subchannel_id schid, void *data) |
| 628 | { |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 629 | int i, mask; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 630 | struct channel_path *chp; |
| 631 | struct subchannel *sch; |
| 632 | |
Cornelia Huck | 12975ae | 2006-10-11 15:31:47 +0200 | [diff] [blame] | 633 | chp = data; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 634 | sch = get_subchannel_by_schid(schid); |
| 635 | if (!sch) |
| 636 | /* Check if the subchannel is now available. */ |
| 637 | return __chp_add_new_sch(schid); |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 638 | spin_lock_irq(sch->lock); |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 639 | for (i=0; i<8; i++) { |
| 640 | mask = 0x80 >> i; |
| 641 | if ((sch->schib.pmcw.pim & mask) && |
| 642 | (sch->schib.pmcw.chpid[i] == chp->id)) { |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 643 | if (stsch(sch->schid, &sch->schib) != 0) { |
| 644 | /* Endgame. */ |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 645 | spin_unlock_irq(sch->lock); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 646 | return -ENXIO; |
| 647 | } |
| 648 | break; |
| 649 | } |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 650 | } |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 651 | if (i==8) { |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 652 | spin_unlock_irq(sch->lock); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 653 | return 0; |
| 654 | } |
| 655 | sch->lpm = ((sch->schib.pmcw.pim & |
| 656 | sch->schib.pmcw.pam & |
| 657 | sch->schib.pmcw.pom) |
Cornelia Huck | 7e8ae7bf | 2006-10-06 16:38:29 +0200 | [diff] [blame] | 658 | | mask) & sch->opm; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 659 | |
| 660 | if (sch->driver && sch->driver->verify) |
| 661 | sch->driver->verify(&sch->dev); |
| 662 | |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 663 | spin_unlock_irq(sch->lock); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 664 | put_device(&sch->dev); |
| 665 | return 0; |
| 666 | } |
| 667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | static int |
| 669 | chp_add(int chpid) |
| 670 | { |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 671 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | char dbf_txt[15]; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 673 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
| 675 | if (!get_chp_status(chpid)) |
| 676 | return 0; /* no need to do the rest */ |
| 677 | |
| 678 | sprintf(dbf_txt, "cadd%x", chpid); |
| 679 | CIO_TRACE_EVENT(2, dbf_txt); |
| 680 | |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 681 | dev = get_device(&css[0]->chps[chpid]->dev); |
| 682 | rc = for_each_subchannel(__chp_add, to_channelpath(dev)); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 683 | if (css_slow_subchannels_exist()) |
| 684 | rc = -EAGAIN; |
| 685 | if (rc != -EAGAIN) |
| 686 | rc = 0; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 687 | put_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | return rc; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Handling of crw machine checks with channel path source. |
| 693 | */ |
| 694 | int |
| 695 | chp_process_crw(int chpid, int on) |
| 696 | { |
| 697 | if (on == 0) { |
| 698 | /* Path has gone. We use the link incident routine.*/ |
| 699 | s390_set_chpid_offline(chpid); |
| 700 | return 0; /* De-register is async anyway. */ |
| 701 | } |
| 702 | /* |
| 703 | * Path has come. Allocate a new channel path structure, |
| 704 | * if needed. |
| 705 | */ |
| 706 | if (get_chp_status(chpid) < 0) |
| 707 | new_channel_path(chpid); |
| 708 | /* Avoid the extra overhead in process_rec_acc. */ |
| 709 | return chp_add(chpid); |
| 710 | } |
| 711 | |
Cornelia Huck | e7769b4 | 2006-10-11 15:31:41 +0200 | [diff] [blame] | 712 | static inline int check_for_io_on_path(struct subchannel *sch, int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | { |
| 714 | int cc; |
| 715 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 716 | cc = stsch(sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | if (cc) |
| 718 | return 0; |
Cornelia Huck | e7769b4 | 2006-10-11 15:31:41 +0200 | [diff] [blame] | 719 | if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | return 0; |
| 722 | } |
| 723 | |
Cornelia Huck | d23861f | 2006-12-04 15:41:04 +0100 | [diff] [blame] | 724 | static void terminate_internal_io(struct subchannel *sch) |
| 725 | { |
| 726 | if (cio_clear(sch)) { |
| 727 | /* Recheck device in case clear failed. */ |
| 728 | sch->lpm = 0; |
| 729 | if (device_trigger_verify(sch) != 0) { |
| 730 | if(css_enqueue_subchannel_slow(sch->schid)) { |
| 731 | css_clear_subchannel_slow_list(); |
| 732 | need_rescan = 1; |
| 733 | } |
| 734 | } |
| 735 | return; |
| 736 | } |
| 737 | /* Request retry of internal operation. */ |
| 738 | device_set_intretry(sch); |
| 739 | /* Call handler. */ |
| 740 | if (sch->driver && sch->driver->termination) |
| 741 | sch->driver->termination(&sch->dev); |
| 742 | } |
| 743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | static inline void |
| 745 | __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on) |
| 746 | { |
| 747 | int chp, old_lpm; |
| 748 | unsigned long flags; |
| 749 | |
| 750 | if (!sch->ssd_info.valid) |
| 751 | return; |
| 752 | |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 753 | spin_lock_irqsave(sch->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | old_lpm = sch->lpm; |
| 755 | for (chp = 0; chp < 8; chp++) { |
| 756 | if (sch->ssd_info.chpid[chp] != chpid) |
| 757 | continue; |
| 758 | |
| 759 | if (on) { |
| 760 | sch->opm |= (0x80 >> chp); |
| 761 | sch->lpm |= (0x80 >> chp); |
| 762 | if (!old_lpm) |
| 763 | device_trigger_reprobe(sch); |
| 764 | else if (sch->driver && sch->driver->verify) |
| 765 | sch->driver->verify(&sch->dev); |
Cornelia Huck | 24cb5b4 | 2006-12-04 15:41:01 +0100 | [diff] [blame] | 766 | break; |
| 767 | } |
| 768 | sch->opm &= ~(0x80 >> chp); |
| 769 | sch->lpm &= ~(0x80 >> chp); |
Cornelia Huck | d23861f | 2006-12-04 15:41:04 +0100 | [diff] [blame] | 770 | if (check_for_io_on_path(sch, chp)) { |
| 771 | if (device_is_online(sch)) |
| 772 | /* Path verification is done after killing. */ |
| 773 | device_kill_io(sch); |
| 774 | else |
| 775 | /* Kill and retry internal I/O. */ |
| 776 | terminate_internal_io(sch); |
| 777 | } else if (!sch->lpm) { |
Cornelia Huck | 24cb5b4 | 2006-12-04 15:41:01 +0100 | [diff] [blame] | 778 | if (device_trigger_verify(sch) != 0) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 779 | if (css_enqueue_subchannel_slow(sch->schid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | css_clear_subchannel_slow_list(); |
| 781 | need_rescan = 1; |
| 782 | } |
Cornelia Huck | 24cb5b4 | 2006-12-04 15:41:01 +0100 | [diff] [blame] | 783 | } |
| 784 | } else if (sch->driver && sch->driver->verify) |
| 785 | sch->driver->verify(&sch->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | break; |
| 787 | } |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 788 | spin_unlock_irqrestore(sch->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | static int |
| 792 | s390_subchannel_vary_chpid_off(struct device *dev, void *data) |
| 793 | { |
| 794 | struct subchannel *sch; |
| 795 | __u8 *chpid; |
| 796 | |
| 797 | sch = to_subchannel(dev); |
| 798 | chpid = data; |
| 799 | |
| 800 | __s390_subchannel_vary_chpid(sch, *chpid, 0); |
| 801 | return 0; |
| 802 | } |
| 803 | |
| 804 | static int |
| 805 | s390_subchannel_vary_chpid_on(struct device *dev, void *data) |
| 806 | { |
| 807 | struct subchannel *sch; |
| 808 | __u8 *chpid; |
| 809 | |
| 810 | sch = to_subchannel(dev); |
| 811 | chpid = data; |
| 812 | |
| 813 | __s390_subchannel_vary_chpid(sch, *chpid, 1); |
| 814 | return 0; |
| 815 | } |
| 816 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 817 | static int |
| 818 | __s390_vary_chpid_on(struct subchannel_id schid, void *data) |
| 819 | { |
| 820 | struct schib schib; |
| 821 | struct subchannel *sch; |
| 822 | |
| 823 | sch = get_subchannel_by_schid(schid); |
| 824 | if (sch) { |
| 825 | put_device(&sch->dev); |
| 826 | return 0; |
| 827 | } |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 828 | if (stsch_err(schid, &schib)) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 829 | /* We're through */ |
| 830 | return -ENXIO; |
| 831 | /* Put it on the slow path. */ |
| 832 | if (css_enqueue_subchannel_slow(schid)) { |
| 833 | css_clear_subchannel_slow_list(); |
| 834 | need_rescan = 1; |
| 835 | return -EAGAIN; |
| 836 | } |
| 837 | return 0; |
| 838 | } |
| 839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | /* |
| 841 | * Function: s390_vary_chpid |
| 842 | * Varies the specified chpid online or offline |
| 843 | */ |
| 844 | static int |
| 845 | s390_vary_chpid( __u8 chpid, int on) |
| 846 | { |
| 847 | char dbf_text[15]; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 848 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
| 850 | sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid); |
| 851 | CIO_TRACE_EVENT( 2, dbf_text); |
| 852 | |
| 853 | status = get_chp_status(chpid); |
| 854 | if (status < 0) { |
| 855 | printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid); |
| 856 | return -EINVAL; |
| 857 | } |
| 858 | |
| 859 | if (!on && !status) { |
| 860 | printk(KERN_ERR "chpid %x is already offline\n", chpid); |
| 861 | return -EINVAL; |
| 862 | } |
| 863 | |
| 864 | set_chp_logically_online(chpid, on); |
| 865 | |
| 866 | /* |
| 867 | * Redo PathVerification on the devices the chpid connects to |
| 868 | */ |
| 869 | |
| 870 | bus_for_each_dev(&css_bus_type, NULL, &chpid, on ? |
| 871 | s390_subchannel_vary_chpid_on : |
| 872 | s390_subchannel_vary_chpid_off); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 873 | if (on) |
| 874 | /* Scan for new devices on varied on path. */ |
| 875 | for_each_subchannel(__s390_vary_chpid_on, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | if (need_rescan || css_slow_subchannels_exist()) |
| 877 | queue_work(slow_path_wq, &slow_path_work); |
| 878 | return 0; |
| 879 | } |
| 880 | |
| 881 | /* |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 882 | * Channel measurement related functions |
| 883 | */ |
| 884 | static ssize_t |
| 885 | chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off, |
| 886 | size_t count) |
| 887 | { |
| 888 | struct channel_path *chp; |
| 889 | unsigned int size; |
| 890 | |
| 891 | chp = to_channelpath(container_of(kobj, struct device, kobj)); |
| 892 | if (!chp->cmg_chars) |
| 893 | return 0; |
| 894 | |
| 895 | size = sizeof(struct cmg_chars); |
| 896 | |
| 897 | if (off > size) |
| 898 | return 0; |
| 899 | if (off + count > size) |
| 900 | count = size - off; |
| 901 | memcpy(buf, chp->cmg_chars + off, count); |
| 902 | return count; |
| 903 | } |
| 904 | |
| 905 | static struct bin_attribute chp_measurement_chars_attr = { |
| 906 | .attr = { |
| 907 | .name = "measurement_chars", |
| 908 | .mode = S_IRUSR, |
| 909 | .owner = THIS_MODULE, |
| 910 | }, |
| 911 | .size = sizeof(struct cmg_chars), |
| 912 | .read = chp_measurement_chars_read, |
| 913 | }; |
| 914 | |
| 915 | static void |
| 916 | chp_measurement_copy_block(struct cmg_entry *buf, |
| 917 | struct channel_subsystem *css, int chpid) |
| 918 | { |
| 919 | void *area; |
| 920 | struct cmg_entry *entry, reference_buf; |
| 921 | int idx; |
| 922 | |
| 923 | if (chpid < 128) { |
| 924 | area = css->cub_addr1; |
| 925 | idx = chpid; |
| 926 | } else { |
| 927 | area = css->cub_addr2; |
| 928 | idx = chpid - 128; |
| 929 | } |
| 930 | entry = area + (idx * sizeof(struct cmg_entry)); |
| 931 | do { |
| 932 | memcpy(buf, entry, sizeof(*entry)); |
| 933 | memcpy(&reference_buf, entry, sizeof(*entry)); |
| 934 | } while (reference_buf.values[0] != buf->values[0]); |
| 935 | } |
| 936 | |
| 937 | static ssize_t |
| 938 | chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count) |
| 939 | { |
| 940 | struct channel_path *chp; |
| 941 | struct channel_subsystem *css; |
| 942 | unsigned int size; |
| 943 | |
| 944 | chp = to_channelpath(container_of(kobj, struct device, kobj)); |
| 945 | css = to_css(chp->dev.parent); |
| 946 | |
Cornelia Huck | 231caa1 | 2006-06-29 14:56:45 +0200 | [diff] [blame] | 947 | size = sizeof(struct cmg_entry); |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 948 | |
| 949 | /* Only allow single reads. */ |
| 950 | if (off || count < size) |
| 951 | return 0; |
| 952 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id); |
Cornelia Huck | 231caa1 | 2006-06-29 14:56:45 +0200 | [diff] [blame] | 953 | count = size; |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 954 | return count; |
| 955 | } |
| 956 | |
| 957 | static struct bin_attribute chp_measurement_attr = { |
| 958 | .attr = { |
| 959 | .name = "measurement", |
| 960 | .mode = S_IRUSR, |
| 961 | .owner = THIS_MODULE, |
| 962 | }, |
| 963 | .size = sizeof(struct cmg_entry), |
| 964 | .read = chp_measurement_read, |
| 965 | }; |
| 966 | |
| 967 | static void |
| 968 | chsc_remove_chp_cmg_attr(struct channel_path *chp) |
| 969 | { |
Cornelia Huck | 1125b46 | 2007-02-05 21:17:18 +0100 | [diff] [blame] | 970 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
| 971 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | static int |
| 975 | chsc_add_chp_cmg_attr(struct channel_path *chp) |
| 976 | { |
| 977 | int ret; |
| 978 | |
Cornelia Huck | 1125b46 | 2007-02-05 21:17:18 +0100 | [diff] [blame] | 979 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 980 | if (ret) |
| 981 | return ret; |
Cornelia Huck | 1125b46 | 2007-02-05 21:17:18 +0100 | [diff] [blame] | 982 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 983 | if (ret) |
Cornelia Huck | 1125b46 | 2007-02-05 21:17:18 +0100 | [diff] [blame] | 984 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 985 | return ret; |
| 986 | } |
| 987 | |
| 988 | static void |
| 989 | chsc_remove_cmg_attr(struct channel_subsystem *css) |
| 990 | { |
| 991 | int i; |
| 992 | |
| 993 | for (i = 0; i <= __MAX_CHPID; i++) { |
| 994 | if (!css->chps[i]) |
| 995 | continue; |
| 996 | chsc_remove_chp_cmg_attr(css->chps[i]); |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | static int |
| 1001 | chsc_add_cmg_attr(struct channel_subsystem *css) |
| 1002 | { |
| 1003 | int i, ret; |
| 1004 | |
| 1005 | ret = 0; |
| 1006 | for (i = 0; i <= __MAX_CHPID; i++) { |
| 1007 | if (!css->chps[i]) |
| 1008 | continue; |
| 1009 | ret = chsc_add_chp_cmg_attr(css->chps[i]); |
| 1010 | if (ret) |
| 1011 | goto cleanup; |
| 1012 | } |
| 1013 | return ret; |
| 1014 | cleanup: |
| 1015 | for (--i; i >= 0; i--) { |
| 1016 | if (!css->chps[i]) |
| 1017 | continue; |
| 1018 | chsc_remove_chp_cmg_attr(css->chps[i]); |
| 1019 | } |
| 1020 | return ret; |
| 1021 | } |
| 1022 | |
| 1023 | |
| 1024 | static int |
| 1025 | __chsc_do_secm(struct channel_subsystem *css, int enable, void *page) |
| 1026 | { |
| 1027 | struct { |
| 1028 | struct chsc_header request; |
| 1029 | u32 operation_code : 2; |
| 1030 | u32 : 30; |
| 1031 | u32 key : 4; |
| 1032 | u32 : 28; |
| 1033 | u32 zeroes1; |
| 1034 | u32 cub_addr1; |
| 1035 | u32 zeroes2; |
| 1036 | u32 cub_addr2; |
| 1037 | u32 reserved[13]; |
| 1038 | struct chsc_header response; |
| 1039 | u32 status : 8; |
| 1040 | u32 : 4; |
| 1041 | u32 fmt : 4; |
| 1042 | u32 : 16; |
| 1043 | } *secm_area; |
| 1044 | int ret, ccode; |
| 1045 | |
| 1046 | secm_area = page; |
| 1047 | secm_area->request.length = 0x0050; |
| 1048 | secm_area->request.code = 0x0016; |
| 1049 | |
| 1050 | secm_area->key = PAGE_DEFAULT_KEY; |
| 1051 | secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1; |
| 1052 | secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2; |
| 1053 | |
| 1054 | secm_area->operation_code = enable ? 0 : 1; |
| 1055 | |
| 1056 | ccode = chsc(secm_area); |
| 1057 | if (ccode > 0) |
| 1058 | return (ccode == 3) ? -ENODEV : -EBUSY; |
| 1059 | |
| 1060 | switch (secm_area->response.code) { |
| 1061 | case 0x0001: /* Success. */ |
| 1062 | ret = 0; |
| 1063 | break; |
| 1064 | case 0x0003: /* Invalid block. */ |
| 1065 | case 0x0007: /* Invalid format. */ |
| 1066 | case 0x0008: /* Other invalid block. */ |
| 1067 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); |
| 1068 | ret = -EINVAL; |
| 1069 | break; |
| 1070 | case 0x0004: /* Command not provided in model. */ |
| 1071 | CIO_CRW_EVENT(2, "Model does not provide secm\n"); |
| 1072 | ret = -EOPNOTSUPP; |
| 1073 | break; |
| 1074 | case 0x0102: /* cub adresses incorrect */ |
| 1075 | CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n"); |
| 1076 | ret = -EINVAL; |
| 1077 | break; |
| 1078 | case 0x0103: /* key error */ |
| 1079 | CIO_CRW_EVENT(2, "Access key error in secm\n"); |
| 1080 | ret = -EINVAL; |
| 1081 | break; |
| 1082 | case 0x0105: /* error while starting */ |
| 1083 | CIO_CRW_EVENT(2, "Error while starting channel measurement\n"); |
| 1084 | ret = -EIO; |
| 1085 | break; |
| 1086 | default: |
| 1087 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", |
| 1088 | secm_area->response.code); |
| 1089 | ret = -EIO; |
| 1090 | } |
| 1091 | return ret; |
| 1092 | } |
| 1093 | |
| 1094 | int |
| 1095 | chsc_secm(struct channel_subsystem *css, int enable) |
| 1096 | { |
| 1097 | void *secm_area; |
| 1098 | int ret; |
| 1099 | |
| 1100 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1101 | if (!secm_area) |
| 1102 | return -ENOMEM; |
| 1103 | |
| 1104 | mutex_lock(&css->mutex); |
| 1105 | if (enable && !css->cm_enabled) { |
| 1106 | css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1107 | css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1108 | if (!css->cub_addr1 || !css->cub_addr2) { |
| 1109 | free_page((unsigned long)css->cub_addr1); |
| 1110 | free_page((unsigned long)css->cub_addr2); |
| 1111 | free_page((unsigned long)secm_area); |
| 1112 | mutex_unlock(&css->mutex); |
| 1113 | return -ENOMEM; |
| 1114 | } |
| 1115 | } |
| 1116 | ret = __chsc_do_secm(css, enable, secm_area); |
| 1117 | if (!ret) { |
| 1118 | css->cm_enabled = enable; |
| 1119 | if (css->cm_enabled) { |
| 1120 | ret = chsc_add_cmg_attr(css); |
| 1121 | if (ret) { |
| 1122 | memset(secm_area, 0, PAGE_SIZE); |
| 1123 | __chsc_do_secm(css, 0, secm_area); |
| 1124 | css->cm_enabled = 0; |
| 1125 | } |
| 1126 | } else |
| 1127 | chsc_remove_cmg_attr(css); |
| 1128 | } |
| 1129 | if (enable && !css->cm_enabled) { |
| 1130 | free_page((unsigned long)css->cub_addr1); |
| 1131 | free_page((unsigned long)css->cub_addr2); |
| 1132 | } |
| 1133 | mutex_unlock(&css->mutex); |
| 1134 | free_page((unsigned long)secm_area); |
| 1135 | return ret; |
| 1136 | } |
| 1137 | |
| 1138 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | * Files for the channel path entries. |
| 1140 | */ |
| 1141 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 1142 | chp_status_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | { |
| 1144 | struct channel_path *chp = container_of(dev, struct channel_path, dev); |
| 1145 | |
| 1146 | if (!chp) |
| 1147 | return 0; |
| 1148 | return (get_chp_status(chp->id) ? sprintf(buf, "online\n") : |
| 1149 | sprintf(buf, "offline\n")); |
| 1150 | } |
| 1151 | |
| 1152 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 1153 | chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | { |
| 1155 | struct channel_path *cp = container_of(dev, struct channel_path, dev); |
| 1156 | char cmd[10]; |
| 1157 | int num_args; |
| 1158 | int error; |
| 1159 | |
| 1160 | num_args = sscanf(buf, "%5s", cmd); |
| 1161 | if (!num_args) |
| 1162 | return count; |
| 1163 | |
| 1164 | if (!strnicmp(cmd, "on", 2)) |
| 1165 | error = s390_vary_chpid(cp->id, 1); |
| 1166 | else if (!strnicmp(cmd, "off", 3)) |
| 1167 | error = s390_vary_chpid(cp->id, 0); |
| 1168 | else |
| 1169 | error = -EINVAL; |
| 1170 | |
| 1171 | return error < 0 ? error : count; |
| 1172 | |
| 1173 | } |
| 1174 | |
| 1175 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); |
| 1176 | |
| 1177 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 1178 | chp_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | { |
| 1180 | struct channel_path *chp = container_of(dev, struct channel_path, dev); |
| 1181 | |
| 1182 | if (!chp) |
| 1183 | return 0; |
| 1184 | return sprintf(buf, "%x\n", chp->desc.desc); |
| 1185 | } |
| 1186 | |
| 1187 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); |
| 1188 | |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1189 | static ssize_t |
| 1190 | chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 1191 | { |
| 1192 | struct channel_path *chp = to_channelpath(dev); |
| 1193 | |
| 1194 | if (!chp) |
| 1195 | return 0; |
| 1196 | if (chp->cmg == -1) /* channel measurements not available */ |
| 1197 | return sprintf(buf, "unknown\n"); |
| 1198 | return sprintf(buf, "%x\n", chp->cmg); |
| 1199 | } |
| 1200 | |
| 1201 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); |
| 1202 | |
| 1203 | static ssize_t |
| 1204 | chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 1205 | { |
| 1206 | struct channel_path *chp = to_channelpath(dev); |
| 1207 | |
| 1208 | if (!chp) |
| 1209 | return 0; |
| 1210 | if (chp->shared == -1) /* channel measurements not available */ |
| 1211 | return sprintf(buf, "unknown\n"); |
| 1212 | return sprintf(buf, "%x\n", chp->shared); |
| 1213 | } |
| 1214 | |
| 1215 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); |
| 1216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | static struct attribute * chp_attrs[] = { |
| 1218 | &dev_attr_status.attr, |
| 1219 | &dev_attr_type.attr, |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1220 | &dev_attr_cmg.attr, |
| 1221 | &dev_attr_shared.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | NULL, |
| 1223 | }; |
| 1224 | |
| 1225 | static struct attribute_group chp_attr_group = { |
| 1226 | .attrs = chp_attrs, |
| 1227 | }; |
| 1228 | |
| 1229 | static void |
| 1230 | chp_release(struct device *dev) |
| 1231 | { |
| 1232 | struct channel_path *cp; |
| 1233 | |
| 1234 | cp = container_of(dev, struct channel_path, dev); |
| 1235 | kfree(cp); |
| 1236 | } |
| 1237 | |
| 1238 | static int |
| 1239 | chsc_determine_channel_path_description(int chpid, |
| 1240 | struct channel_path_desc *desc) |
| 1241 | { |
| 1242 | int ccode, ret; |
| 1243 | |
| 1244 | struct { |
| 1245 | struct chsc_header request; |
| 1246 | u32 : 24; |
| 1247 | u32 first_chpid : 8; |
| 1248 | u32 : 24; |
| 1249 | u32 last_chpid : 8; |
| 1250 | u32 zeroes1; |
| 1251 | struct chsc_header response; |
| 1252 | u32 zeroes2; |
| 1253 | struct channel_path_desc desc; |
| 1254 | } *scpd_area; |
| 1255 | |
| 1256 | scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1257 | if (!scpd_area) |
| 1258 | return -ENOMEM; |
| 1259 | |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1260 | scpd_area->request.length = 0x0010; |
| 1261 | scpd_area->request.code = 0x0002; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | |
| 1263 | scpd_area->first_chpid = chpid; |
| 1264 | scpd_area->last_chpid = chpid; |
| 1265 | |
| 1266 | ccode = chsc(scpd_area); |
| 1267 | if (ccode > 0) { |
| 1268 | ret = (ccode == 3) ? -ENODEV : -EBUSY; |
| 1269 | goto out; |
| 1270 | } |
| 1271 | |
| 1272 | switch (scpd_area->response.code) { |
| 1273 | case 0x0001: /* Success. */ |
| 1274 | memcpy(desc, &scpd_area->desc, |
| 1275 | sizeof(struct channel_path_desc)); |
| 1276 | ret = 0; |
| 1277 | break; |
| 1278 | case 0x0003: /* Invalid block. */ |
| 1279 | case 0x0007: /* Invalid format. */ |
| 1280 | case 0x0008: /* Other invalid block. */ |
| 1281 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); |
| 1282 | ret = -EINVAL; |
| 1283 | break; |
| 1284 | case 0x0004: /* Command not provided in model. */ |
| 1285 | CIO_CRW_EVENT(2, "Model does not provide scpd\n"); |
| 1286 | ret = -EOPNOTSUPP; |
| 1287 | break; |
| 1288 | default: |
| 1289 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", |
| 1290 | scpd_area->response.code); |
| 1291 | ret = -EIO; |
| 1292 | } |
| 1293 | out: |
| 1294 | free_page((unsigned long)scpd_area); |
| 1295 | return ret; |
| 1296 | } |
| 1297 | |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1298 | static void |
| 1299 | chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, |
| 1300 | struct cmg_chars *chars) |
| 1301 | { |
| 1302 | switch (chp->cmg) { |
| 1303 | case 2: |
| 1304 | case 3: |
| 1305 | chp->cmg_chars = kmalloc(sizeof(struct cmg_chars), |
| 1306 | GFP_KERNEL); |
| 1307 | if (chp->cmg_chars) { |
| 1308 | int i, mask; |
| 1309 | struct cmg_chars *cmg_chars; |
| 1310 | |
| 1311 | cmg_chars = chp->cmg_chars; |
| 1312 | for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { |
| 1313 | mask = 0x80 >> (i + 3); |
| 1314 | if (cmcv & mask) |
| 1315 | cmg_chars->values[i] = chars->values[i]; |
| 1316 | else |
| 1317 | cmg_chars->values[i] = 0; |
| 1318 | } |
| 1319 | } |
| 1320 | break; |
| 1321 | default: |
| 1322 | /* No cmg-dependent data. */ |
| 1323 | break; |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | static int |
| 1328 | chsc_get_channel_measurement_chars(struct channel_path *chp) |
| 1329 | { |
| 1330 | int ccode, ret; |
| 1331 | |
| 1332 | struct { |
| 1333 | struct chsc_header request; |
| 1334 | u32 : 24; |
| 1335 | u32 first_chpid : 8; |
| 1336 | u32 : 24; |
| 1337 | u32 last_chpid : 8; |
| 1338 | u32 zeroes1; |
| 1339 | struct chsc_header response; |
| 1340 | u32 zeroes2; |
| 1341 | u32 not_valid : 1; |
| 1342 | u32 shared : 1; |
| 1343 | u32 : 22; |
| 1344 | u32 chpid : 8; |
| 1345 | u32 cmcv : 5; |
| 1346 | u32 : 11; |
| 1347 | u32 cmgq : 8; |
| 1348 | u32 cmg : 8; |
| 1349 | u32 zeroes3; |
| 1350 | u32 data[NR_MEASUREMENT_CHARS]; |
| 1351 | } *scmc_area; |
| 1352 | |
| 1353 | scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1354 | if (!scmc_area) |
| 1355 | return -ENOMEM; |
| 1356 | |
| 1357 | scmc_area->request.length = 0x0010; |
| 1358 | scmc_area->request.code = 0x0022; |
| 1359 | |
| 1360 | scmc_area->first_chpid = chp->id; |
| 1361 | scmc_area->last_chpid = chp->id; |
| 1362 | |
| 1363 | ccode = chsc(scmc_area); |
| 1364 | if (ccode > 0) { |
| 1365 | ret = (ccode == 3) ? -ENODEV : -EBUSY; |
| 1366 | goto out; |
| 1367 | } |
| 1368 | |
| 1369 | switch (scmc_area->response.code) { |
| 1370 | case 0x0001: /* Success. */ |
| 1371 | if (!scmc_area->not_valid) { |
| 1372 | chp->cmg = scmc_area->cmg; |
| 1373 | chp->shared = scmc_area->shared; |
| 1374 | chsc_initialize_cmg_chars(chp, scmc_area->cmcv, |
| 1375 | (struct cmg_chars *) |
| 1376 | &scmc_area->data); |
| 1377 | } else { |
| 1378 | chp->cmg = -1; |
| 1379 | chp->shared = -1; |
| 1380 | } |
| 1381 | ret = 0; |
| 1382 | break; |
| 1383 | case 0x0003: /* Invalid block. */ |
| 1384 | case 0x0007: /* Invalid format. */ |
| 1385 | case 0x0008: /* Invalid bit combination. */ |
| 1386 | CIO_CRW_EVENT(2, "Error in chsc request block!\n"); |
| 1387 | ret = -EINVAL; |
| 1388 | break; |
| 1389 | case 0x0004: /* Command not provided. */ |
| 1390 | CIO_CRW_EVENT(2, "Model does not provide scmc\n"); |
| 1391 | ret = -EOPNOTSUPP; |
| 1392 | break; |
| 1393 | default: |
| 1394 | CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", |
| 1395 | scmc_area->response.code); |
| 1396 | ret = -EIO; |
| 1397 | } |
| 1398 | out: |
| 1399 | free_page((unsigned long)scmc_area); |
| 1400 | return ret; |
| 1401 | } |
| 1402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | /* |
| 1404 | * Entries for chpids on the system bus. |
| 1405 | * This replaces /proc/chpids. |
| 1406 | */ |
| 1407 | static int |
| 1408 | new_channel_path(int chpid) |
| 1409 | { |
| 1410 | struct channel_path *chp; |
| 1411 | int ret; |
| 1412 | |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 1413 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | if (!chp) |
| 1415 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
| 1417 | /* fill in status, etc. */ |
| 1418 | chp->id = chpid; |
| 1419 | chp->state = 1; |
Heiko Carstens | 292888c | 2006-08-30 14:33:35 +0200 | [diff] [blame] | 1420 | chp->dev.parent = &css[0]->device; |
| 1421 | chp->dev.release = chp_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid); |
| 1423 | |
| 1424 | /* Obtain channel path description and fill it in. */ |
| 1425 | ret = chsc_determine_channel_path_description(chpid, &chp->desc); |
| 1426 | if (ret) |
| 1427 | goto out_free; |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1428 | /* Get channel-measurement characteristics. */ |
| 1429 | if (css_characteristics_avail && css_chsc_characteristics.scmc |
| 1430 | && css_chsc_characteristics.secm) { |
| 1431 | ret = chsc_get_channel_measurement_chars(chp); |
| 1432 | if (ret) |
| 1433 | goto out_free; |
| 1434 | } else { |
| 1435 | static int msg_done; |
| 1436 | |
| 1437 | if (!msg_done) { |
| 1438 | printk(KERN_WARNING "cio: Channel measurements not " |
| 1439 | "available, continuing.\n"); |
| 1440 | msg_done = 1; |
| 1441 | } |
| 1442 | chp->cmg = -1; |
| 1443 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
| 1445 | /* make it known to the system */ |
| 1446 | ret = device_register(&chp->dev); |
| 1447 | if (ret) { |
| 1448 | printk(KERN_WARNING "%s: could not register %02x\n", |
| 1449 | __func__, chpid); |
| 1450 | goto out_free; |
| 1451 | } |
| 1452 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); |
| 1453 | if (ret) { |
| 1454 | device_unregister(&chp->dev); |
| 1455 | goto out_free; |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1456 | } |
| 1457 | mutex_lock(&css[0]->mutex); |
| 1458 | if (css[0]->cm_enabled) { |
| 1459 | ret = chsc_add_chp_cmg_attr(chp); |
| 1460 | if (ret) { |
| 1461 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); |
| 1462 | device_unregister(&chp->dev); |
| 1463 | mutex_unlock(&css[0]->mutex); |
| 1464 | goto out_free; |
| 1465 | } |
| 1466 | } |
| 1467 | css[0]->chps[chpid] = chp; |
| 1468 | mutex_unlock(&css[0]->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | return ret; |
| 1470 | out_free: |
| 1471 | kfree(chp); |
| 1472 | return ret; |
| 1473 | } |
| 1474 | |
| 1475 | void * |
| 1476 | chsc_get_chp_desc(struct subchannel *sch, int chp_no) |
| 1477 | { |
| 1478 | struct channel_path *chp; |
| 1479 | struct channel_path_desc *desc; |
| 1480 | |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame] | 1481 | chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | if (!chp) |
| 1483 | return NULL; |
| 1484 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); |
| 1485 | if (!desc) |
| 1486 | return NULL; |
| 1487 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); |
| 1488 | return desc; |
| 1489 | } |
| 1490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | static int __init |
| 1492 | chsc_alloc_sei_area(void) |
| 1493 | { |
| 1494 | sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1495 | if (!sei_page) |
| 1496 | printk(KERN_WARNING"Can't allocate page for processing of " \ |
| 1497 | "chsc machine checks!\n"); |
| 1498 | return (sei_page ? 0 : -ENOMEM); |
| 1499 | } |
| 1500 | |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 1501 | int __init |
| 1502 | chsc_enable_facility(int operation_code) |
| 1503 | { |
| 1504 | int ret; |
| 1505 | struct { |
| 1506 | struct chsc_header request; |
| 1507 | u8 reserved1:4; |
| 1508 | u8 format:4; |
| 1509 | u8 reserved2; |
| 1510 | u16 operation_code; |
| 1511 | u32 reserved3; |
| 1512 | u32 reserved4; |
| 1513 | u32 operation_data_area[252]; |
| 1514 | struct chsc_header response; |
| 1515 | u32 reserved5:4; |
| 1516 | u32 format2:4; |
| 1517 | u32 reserved6:24; |
| 1518 | } *sda_area; |
| 1519 | |
| 1520 | sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA); |
| 1521 | if (!sda_area) |
| 1522 | return -ENOMEM; |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1523 | sda_area->request.length = 0x0400; |
| 1524 | sda_area->request.code = 0x0031; |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 1525 | sda_area->operation_code = operation_code; |
| 1526 | |
| 1527 | ret = chsc(sda_area); |
| 1528 | if (ret > 0) { |
| 1529 | ret = (ret == 3) ? -ENODEV : -EBUSY; |
| 1530 | goto out; |
| 1531 | } |
| 1532 | switch (sda_area->response.code) { |
Cornelia Huck | 15730dd | 2006-03-06 15:43:02 -0800 | [diff] [blame] | 1533 | case 0x0001: /* everything ok */ |
| 1534 | ret = 0; |
| 1535 | break; |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 1536 | case 0x0003: /* invalid request block */ |
| 1537 | case 0x0007: |
| 1538 | ret = -EINVAL; |
| 1539 | break; |
| 1540 | case 0x0004: /* command not provided */ |
| 1541 | case 0x0101: /* facility not provided */ |
| 1542 | ret = -EOPNOTSUPP; |
| 1543 | break; |
Cornelia Huck | 15730dd | 2006-03-06 15:43:02 -0800 | [diff] [blame] | 1544 | default: /* something went wrong */ |
| 1545 | ret = -EIO; |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 1546 | } |
| 1547 | out: |
| 1548 | free_page((unsigned long)sda_area); |
| 1549 | return ret; |
| 1550 | } |
| 1551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | subsys_initcall(chsc_alloc_sei_area); |
| 1553 | |
| 1554 | struct css_general_char css_general_characteristics; |
| 1555 | struct css_chsc_char css_chsc_characteristics; |
| 1556 | |
| 1557 | int __init |
| 1558 | chsc_determine_css_characteristics(void) |
| 1559 | { |
| 1560 | int result; |
| 1561 | struct { |
| 1562 | struct chsc_header request; |
| 1563 | u32 reserved1; |
| 1564 | u32 reserved2; |
| 1565 | u32 reserved3; |
| 1566 | struct chsc_header response; |
| 1567 | u32 reserved4; |
| 1568 | u32 general_char[510]; |
| 1569 | u32 chsc_char[518]; |
| 1570 | } *scsc_area; |
| 1571 | |
| 1572 | scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1573 | if (!scsc_area) { |
| 1574 | printk(KERN_WARNING"cio: Was not able to determine available" \ |
| 1575 | "CHSCs due to no memory.\n"); |
| 1576 | return -ENOMEM; |
| 1577 | } |
| 1578 | |
Cornelia Huck | 495a5b4 | 2006-03-24 03:15:14 -0800 | [diff] [blame] | 1579 | scsc_area->request.length = 0x0010; |
| 1580 | scsc_area->request.code = 0x0010; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | |
| 1582 | result = chsc(scsc_area); |
| 1583 | if (result) { |
| 1584 | printk(KERN_WARNING"cio: Was not able to determine " \ |
| 1585 | "available CHSCs, cc=%i.\n", result); |
| 1586 | result = -EIO; |
| 1587 | goto exit; |
| 1588 | } |
| 1589 | |
| 1590 | if (scsc_area->response.code != 1) { |
| 1591 | printk(KERN_WARNING"cio: Was not able to determine " \ |
| 1592 | "available CHSCs.\n"); |
| 1593 | result = -EIO; |
| 1594 | goto exit; |
| 1595 | } |
| 1596 | memcpy(&css_general_characteristics, scsc_area->general_char, |
| 1597 | sizeof(css_general_characteristics)); |
| 1598 | memcpy(&css_chsc_characteristics, scsc_area->chsc_char, |
| 1599 | sizeof(css_chsc_characteristics)); |
| 1600 | exit: |
| 1601 | free_page ((unsigned long) scsc_area); |
| 1602 | return result; |
| 1603 | } |
| 1604 | |
| 1605 | EXPORT_SYMBOL_GPL(css_general_characteristics); |
| 1606 | EXPORT_SYMBOL_GPL(css_chsc_characteristics); |