Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1 | /* |
| 2 | * IUCV base infrastructure. |
| 3 | * |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 4 | * Copyright IBM Corp. 2001, 2009 |
| 5 | * |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 6 | * Author(s): |
| 7 | * Original source: |
| 8 | * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000 |
| 9 | * Xenia Tkatschow (xenia@us.ibm.com) |
| 10 | * 2Gb awareness and general cleanup: |
| 11 | * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) |
| 12 | * Rewritten for af_iucv: |
| 13 | * Martin Schwidefsky <schwidefsky@de.ibm.com> |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 14 | * PM functions: |
| 15 | * Ursula Braun (ursula.braun@de.ibm.com) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 16 | * |
| 17 | * Documentation used: |
| 18 | * The original source |
| 19 | * CP Programming Service, IBM document # SC24-5760 |
| 20 | * |
| 21 | * This program is free software; you can redistribute it and/or modify |
| 22 | * it under the terms of the GNU General Public License as published by |
| 23 | * the Free Software Foundation; either version 2, or (at your option) |
| 24 | * any later version. |
| 25 | * |
| 26 | * This program is distributed in the hope that it will be useful, |
| 27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 29 | * GNU General Public License for more details. |
| 30 | * |
| 31 | * You should have received a copy of the GNU General Public License |
| 32 | * along with this program; if not, write to the Free Software |
| 33 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 34 | */ |
| 35 | |
Ursula Braun | 8f7c502 | 2008-12-25 13:39:47 +0100 | [diff] [blame] | 36 | #define KMSG_COMPONENT "iucv" |
| 37 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 38 | |
Heiko Carstens | 052ff46 | 2011-01-05 12:47:28 +0100 | [diff] [blame] | 39 | #include <linux/kernel_stat.h> |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 40 | #include <linux/module.h> |
| 41 | #include <linux/moduleparam.h> |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 42 | #include <linux/spinlock.h> |
| 43 | #include <linux/kernel.h> |
| 44 | #include <linux/slab.h> |
| 45 | #include <linux/init.h> |
| 46 | #include <linux/interrupt.h> |
| 47 | #include <linux/list.h> |
| 48 | #include <linux/errno.h> |
| 49 | #include <linux/err.h> |
| 50 | #include <linux/device.h> |
| 51 | #include <linux/cpu.h> |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 52 | #include <linux/reboot.h> |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 53 | #include <net/iucv/iucv.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 54 | #include <linux/atomic.h> |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 55 | #include <asm/ebcdic.h> |
| 56 | #include <asm/io.h> |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 57 | #include <asm/irq.h> |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 58 | #include <asm/smp.h> |
| 59 | |
| 60 | /* |
| 61 | * FLAGS: |
| 62 | * All flags are defined in the field IPFLAGS1 of each function |
| 63 | * and can be found in CP Programming Services. |
| 64 | * IPSRCCLS - Indicates you have specified a source class. |
| 65 | * IPTRGCLS - Indicates you have specified a target class. |
| 66 | * IPFGPID - Indicates you have specified a pathid. |
| 67 | * IPFGMID - Indicates you have specified a message ID. |
| 68 | * IPNORPY - Indicates a one-way message. No reply expected. |
| 69 | * IPALL - Indicates that all paths are affected. |
| 70 | */ |
| 71 | #define IUCV_IPSRCCLS 0x01 |
| 72 | #define IUCV_IPTRGCLS 0x01 |
| 73 | #define IUCV_IPFGPID 0x02 |
| 74 | #define IUCV_IPFGMID 0x04 |
| 75 | #define IUCV_IPNORPY 0x10 |
| 76 | #define IUCV_IPALL 0x80 |
| 77 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 78 | static int iucv_bus_match(struct device *dev, struct device_driver *drv) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 79 | { |
| 80 | return 0; |
| 81 | } |
| 82 | |
Ursula Braun | 4c89d86 | 2009-09-16 04:37:22 +0000 | [diff] [blame] | 83 | enum iucv_pm_states { |
| 84 | IUCV_PM_INITIAL = 0, |
| 85 | IUCV_PM_FREEZING = 1, |
| 86 | IUCV_PM_THAWING = 2, |
| 87 | IUCV_PM_RESTORING = 3, |
| 88 | }; |
| 89 | static enum iucv_pm_states iucv_pm_state; |
| 90 | |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 91 | static int iucv_pm_prepare(struct device *); |
| 92 | static void iucv_pm_complete(struct device *); |
| 93 | static int iucv_pm_freeze(struct device *); |
| 94 | static int iucv_pm_thaw(struct device *); |
| 95 | static int iucv_pm_restore(struct device *); |
| 96 | |
Alexey Dobriyan | 4714521 | 2009-12-14 18:00:08 -0800 | [diff] [blame] | 97 | static const struct dev_pm_ops iucv_pm_ops = { |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 98 | .prepare = iucv_pm_prepare, |
| 99 | .complete = iucv_pm_complete, |
| 100 | .freeze = iucv_pm_freeze, |
| 101 | .thaw = iucv_pm_thaw, |
| 102 | .restore = iucv_pm_restore, |
| 103 | }; |
| 104 | |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 105 | struct bus_type iucv_bus = { |
| 106 | .name = "iucv", |
| 107 | .match = iucv_bus_match, |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 108 | .pm = &iucv_pm_ops, |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 109 | }; |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 110 | EXPORT_SYMBOL(iucv_bus); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 111 | |
| 112 | struct device *iucv_root; |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 113 | EXPORT_SYMBOL(iucv_root); |
| 114 | |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 115 | static int iucv_available; |
| 116 | |
| 117 | /* General IUCV interrupt structure */ |
| 118 | struct iucv_irq_data { |
| 119 | u16 ippathid; |
| 120 | u8 ipflags1; |
| 121 | u8 iptype; |
| 122 | u32 res2[8]; |
| 123 | }; |
| 124 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 125 | struct iucv_irq_list { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 126 | struct list_head list; |
| 127 | struct iucv_irq_data data; |
| 128 | }; |
| 129 | |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 130 | static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 131 | static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE }; |
| 132 | static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE }; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 133 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 134 | /* |
| 135 | * Queue of interrupt buffers lock for delivery via the tasklet |
| 136 | * (fast but can't call smp_call_function). |
| 137 | */ |
| 138 | static LIST_HEAD(iucv_task_queue); |
| 139 | |
| 140 | /* |
| 141 | * The tasklet for fast delivery of iucv interrupts. |
| 142 | */ |
| 143 | static void iucv_tasklet_fn(unsigned long); |
| 144 | static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0); |
| 145 | |
| 146 | /* |
| 147 | * Queue of interrupt buffers for delivery via a work queue |
| 148 | * (slower but can call smp_call_function). |
| 149 | */ |
| 150 | static LIST_HEAD(iucv_work_queue); |
| 151 | |
| 152 | /* |
| 153 | * The work element to deliver path pending interrupts. |
| 154 | */ |
| 155 | static void iucv_work_fn(struct work_struct *work); |
| 156 | static DECLARE_WORK(iucv_work, iucv_work_fn); |
| 157 | |
| 158 | /* |
| 159 | * Spinlock protecting task and work queue. |
| 160 | */ |
| 161 | static DEFINE_SPINLOCK(iucv_queue_lock); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 162 | |
| 163 | enum iucv_command_codes { |
| 164 | IUCV_QUERY = 0, |
| 165 | IUCV_RETRIEVE_BUFFER = 2, |
| 166 | IUCV_SEND = 4, |
| 167 | IUCV_RECEIVE = 5, |
| 168 | IUCV_REPLY = 6, |
| 169 | IUCV_REJECT = 8, |
| 170 | IUCV_PURGE = 9, |
| 171 | IUCV_ACCEPT = 10, |
| 172 | IUCV_CONNECT = 11, |
| 173 | IUCV_DECLARE_BUFFER = 12, |
| 174 | IUCV_QUIESCE = 13, |
| 175 | IUCV_RESUME = 14, |
| 176 | IUCV_SEVER = 15, |
| 177 | IUCV_SETMASK = 16, |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 178 | IUCV_SETCONTROLMASK = 17, |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 179 | }; |
| 180 | |
| 181 | /* |
| 182 | * Error messages that are used with the iucv_sever function. They get |
| 183 | * converted to EBCDIC. |
| 184 | */ |
| 185 | static char iucv_error_no_listener[16] = "NO LISTENER"; |
| 186 | static char iucv_error_no_memory[16] = "NO MEMORY"; |
| 187 | static char iucv_error_pathid[16] = "INVALID PATHID"; |
| 188 | |
| 189 | /* |
| 190 | * iucv_handler_list: List of registered handlers. |
| 191 | */ |
| 192 | static LIST_HEAD(iucv_handler_list); |
| 193 | |
| 194 | /* |
| 195 | * iucv_path_table: an array of iucv_path structures. |
| 196 | */ |
| 197 | static struct iucv_path **iucv_path_table; |
| 198 | static unsigned long iucv_max_pathid; |
| 199 | |
| 200 | /* |
| 201 | * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table |
| 202 | */ |
| 203 | static DEFINE_SPINLOCK(iucv_table_lock); |
| 204 | |
| 205 | /* |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 206 | * iucv_active_cpu: contains the number of the cpu executing the tasklet |
| 207 | * or the work handler. Needed for iucv_path_sever called from tasklet. |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 208 | */ |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 209 | static int iucv_active_cpu = -1; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 210 | |
| 211 | /* |
| 212 | * Mutex and wait queue for iucv_register/iucv_unregister. |
| 213 | */ |
| 214 | static DEFINE_MUTEX(iucv_register_mutex); |
| 215 | |
| 216 | /* |
| 217 | * Counter for number of non-smp capable handlers. |
| 218 | */ |
| 219 | static int iucv_nonsmp_handler; |
| 220 | |
| 221 | /* |
| 222 | * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, |
| 223 | * iucv_path_quiesce and iucv_path_sever. |
| 224 | */ |
| 225 | struct iucv_cmd_control { |
| 226 | u16 ippathid; |
| 227 | u8 ipflags1; |
| 228 | u8 iprcode; |
| 229 | u16 ipmsglim; |
| 230 | u16 res1; |
| 231 | u8 ipvmid[8]; |
| 232 | u8 ipuser[16]; |
| 233 | u8 iptarget[8]; |
| 234 | } __attribute__ ((packed,aligned(8))); |
| 235 | |
| 236 | /* |
| 237 | * Data in parameter list iucv structure. Used by iucv_message_send, |
| 238 | * iucv_message_send2way and iucv_message_reply. |
| 239 | */ |
| 240 | struct iucv_cmd_dpl { |
| 241 | u16 ippathid; |
| 242 | u8 ipflags1; |
| 243 | u8 iprcode; |
| 244 | u32 ipmsgid; |
| 245 | u32 iptrgcls; |
| 246 | u8 iprmmsg[8]; |
| 247 | u32 ipsrccls; |
| 248 | u32 ipmsgtag; |
| 249 | u32 ipbfadr2; |
| 250 | u32 ipbfln2f; |
| 251 | u32 res; |
| 252 | } __attribute__ ((packed,aligned(8))); |
| 253 | |
| 254 | /* |
| 255 | * Data in buffer iucv structure. Used by iucv_message_receive, |
| 256 | * iucv_message_reject, iucv_message_send, iucv_message_send2way |
| 257 | * and iucv_declare_cpu. |
| 258 | */ |
| 259 | struct iucv_cmd_db { |
| 260 | u16 ippathid; |
| 261 | u8 ipflags1; |
| 262 | u8 iprcode; |
| 263 | u32 ipmsgid; |
| 264 | u32 iptrgcls; |
| 265 | u32 ipbfadr1; |
| 266 | u32 ipbfln1f; |
| 267 | u32 ipsrccls; |
| 268 | u32 ipmsgtag; |
| 269 | u32 ipbfadr2; |
| 270 | u32 ipbfln2f; |
| 271 | u32 res; |
| 272 | } __attribute__ ((packed,aligned(8))); |
| 273 | |
| 274 | /* |
| 275 | * Purge message iucv structure. Used by iucv_message_purge. |
| 276 | */ |
| 277 | struct iucv_cmd_purge { |
| 278 | u16 ippathid; |
| 279 | u8 ipflags1; |
| 280 | u8 iprcode; |
| 281 | u32 ipmsgid; |
| 282 | u8 ipaudit[3]; |
| 283 | u8 res1[5]; |
| 284 | u32 res2; |
| 285 | u32 ipsrccls; |
| 286 | u32 ipmsgtag; |
| 287 | u32 res3[3]; |
| 288 | } __attribute__ ((packed,aligned(8))); |
| 289 | |
| 290 | /* |
| 291 | * Set mask iucv structure. Used by iucv_enable_cpu. |
| 292 | */ |
| 293 | struct iucv_cmd_set_mask { |
| 294 | u8 ipmask; |
| 295 | u8 res1[2]; |
| 296 | u8 iprcode; |
| 297 | u32 res2[9]; |
| 298 | } __attribute__ ((packed,aligned(8))); |
| 299 | |
| 300 | union iucv_param { |
| 301 | struct iucv_cmd_control ctrl; |
| 302 | struct iucv_cmd_dpl dpl; |
| 303 | struct iucv_cmd_db db; |
| 304 | struct iucv_cmd_purge purge; |
| 305 | struct iucv_cmd_set_mask set_mask; |
| 306 | }; |
| 307 | |
| 308 | /* |
| 309 | * Anchor for per-cpu IUCV command parameter block. |
| 310 | */ |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 311 | static union iucv_param *iucv_param[NR_CPUS]; |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 312 | static union iucv_param *iucv_param_irq[NR_CPUS]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 313 | |
| 314 | /** |
| 315 | * iucv_call_b2f0 |
| 316 | * @code: identifier of IUCV call to CP. |
| 317 | * @parm: pointer to a struct iucv_parm block |
| 318 | * |
| 319 | * Calls CP to execute IUCV commands. |
| 320 | * |
| 321 | * Returns the result of the CP IUCV call. |
| 322 | */ |
Heiko Carstens | eb090ad | 2016-06-20 14:03:00 +0200 | [diff] [blame^] | 323 | static inline int __iucv_call_b2f0(int command, union iucv_param *parm) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 324 | { |
| 325 | register unsigned long reg0 asm ("0"); |
| 326 | register unsigned long reg1 asm ("1"); |
| 327 | int ccode; |
| 328 | |
| 329 | reg0 = command; |
Heiko Carstens | eb090ad | 2016-06-20 14:03:00 +0200 | [diff] [blame^] | 330 | reg1 = (unsigned long)parm; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 331 | asm volatile( |
| 332 | " .long 0xb2f01000\n" |
| 333 | " ipm %0\n" |
| 334 | " srl %0,28\n" |
| 335 | : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1) |
| 336 | : "m" (*parm) : "cc"); |
Heiko Carstens | eb090ad | 2016-06-20 14:03:00 +0200 | [diff] [blame^] | 337 | return ccode; |
| 338 | } |
| 339 | |
| 340 | static inline int iucv_call_b2f0(int command, union iucv_param *parm) |
| 341 | { |
| 342 | int ccode; |
| 343 | |
| 344 | ccode = __iucv_call_b2f0(command, parm); |
| 345 | return ccode == 1 ? parm->ctrl.iprcode : ccode; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /** |
| 349 | * iucv_query_maxconn |
| 350 | * |
| 351 | * Determines the maximum number of connections that may be established. |
| 352 | * |
| 353 | * Returns the maximum number of connections or -EPERM is IUCV is not |
| 354 | * available. |
| 355 | */ |
Heiko Carstens | eb090ad | 2016-06-20 14:03:00 +0200 | [diff] [blame^] | 356 | static int __iucv_query_maxconn(void *param, unsigned long *max_pathid) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 357 | { |
| 358 | register unsigned long reg0 asm ("0"); |
| 359 | register unsigned long reg1 asm ("1"); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 360 | int ccode; |
| 361 | |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 362 | reg0 = IUCV_QUERY; |
| 363 | reg1 = (unsigned long) param; |
| 364 | asm volatile ( |
| 365 | " .long 0xb2f01000\n" |
| 366 | " ipm %0\n" |
| 367 | " srl %0,28\n" |
| 368 | : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc"); |
Heiko Carstens | eb090ad | 2016-06-20 14:03:00 +0200 | [diff] [blame^] | 369 | *max_pathid = reg1; |
| 370 | return ccode; |
| 371 | } |
| 372 | |
| 373 | static int iucv_query_maxconn(void) |
| 374 | { |
| 375 | unsigned long max_pathid; |
| 376 | void *param; |
| 377 | int ccode; |
| 378 | |
| 379 | param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA); |
| 380 | if (!param) |
| 381 | return -ENOMEM; |
| 382 | ccode = __iucv_query_maxconn(param, &max_pathid); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 383 | if (ccode == 0) |
Heiko Carstens | eb090ad | 2016-06-20 14:03:00 +0200 | [diff] [blame^] | 384 | iucv_max_pathid = max_pathid; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 385 | kfree(param); |
| 386 | return ccode ? -EPERM : 0; |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * iucv_allow_cpu |
| 391 | * @data: unused |
| 392 | * |
| 393 | * Allow iucv interrupts on this cpu. |
| 394 | */ |
| 395 | static void iucv_allow_cpu(void *data) |
| 396 | { |
| 397 | int cpu = smp_processor_id(); |
| 398 | union iucv_param *parm; |
| 399 | |
| 400 | /* |
| 401 | * Enable all iucv interrupts. |
| 402 | * ipmask contains bits for the different interrupts |
| 403 | * 0x80 - Flag to allow nonpriority message pending interrupts |
| 404 | * 0x40 - Flag to allow priority message pending interrupts |
| 405 | * 0x20 - Flag to allow nonpriority message completion interrupts |
| 406 | * 0x10 - Flag to allow priority message completion interrupts |
| 407 | * 0x08 - Flag to allow IUCV control interrupts |
| 408 | */ |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 409 | parm = iucv_param_irq[cpu]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 410 | memset(parm, 0, sizeof(union iucv_param)); |
| 411 | parm->set_mask.ipmask = 0xf8; |
| 412 | iucv_call_b2f0(IUCV_SETMASK, parm); |
| 413 | |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 414 | /* |
| 415 | * Enable all iucv control interrupts. |
| 416 | * ipmask contains bits for the different interrupts |
| 417 | * 0x80 - Flag to allow pending connections interrupts |
| 418 | * 0x40 - Flag to allow connection complete interrupts |
| 419 | * 0x20 - Flag to allow connection severed interrupts |
| 420 | * 0x10 - Flag to allow connection quiesced interrupts |
| 421 | * 0x08 - Flag to allow connection resumed interrupts |
| 422 | */ |
| 423 | memset(parm, 0, sizeof(union iucv_param)); |
| 424 | parm->set_mask.ipmask = 0xf8; |
| 425 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 426 | /* Set indication that iucv interrupts are allowed for this cpu. */ |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 427 | cpumask_set_cpu(cpu, &iucv_irq_cpumask); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | /** |
| 431 | * iucv_block_cpu |
| 432 | * @data: unused |
| 433 | * |
| 434 | * Block iucv interrupts on this cpu. |
| 435 | */ |
| 436 | static void iucv_block_cpu(void *data) |
| 437 | { |
| 438 | int cpu = smp_processor_id(); |
| 439 | union iucv_param *parm; |
| 440 | |
| 441 | /* Disable all iucv interrupts. */ |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 442 | parm = iucv_param_irq[cpu]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 443 | memset(parm, 0, sizeof(union iucv_param)); |
| 444 | iucv_call_b2f0(IUCV_SETMASK, parm); |
| 445 | |
| 446 | /* Clear indication that iucv interrupts are allowed for this cpu. */ |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 447 | cpumask_clear_cpu(cpu, &iucv_irq_cpumask); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | /** |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 451 | * iucv_block_cpu_almost |
| 452 | * @data: unused |
| 453 | * |
| 454 | * Allow connection-severed interrupts only on this cpu. |
| 455 | */ |
| 456 | static void iucv_block_cpu_almost(void *data) |
| 457 | { |
| 458 | int cpu = smp_processor_id(); |
| 459 | union iucv_param *parm; |
| 460 | |
| 461 | /* Allow iucv control interrupts only */ |
| 462 | parm = iucv_param_irq[cpu]; |
| 463 | memset(parm, 0, sizeof(union iucv_param)); |
| 464 | parm->set_mask.ipmask = 0x08; |
| 465 | iucv_call_b2f0(IUCV_SETMASK, parm); |
| 466 | /* Allow iucv-severed interrupt only */ |
| 467 | memset(parm, 0, sizeof(union iucv_param)); |
| 468 | parm->set_mask.ipmask = 0x20; |
| 469 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); |
| 470 | |
| 471 | /* Clear indication that iucv interrupts are allowed for this cpu. */ |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 472 | cpumask_clear_cpu(cpu, &iucv_irq_cpumask); |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | /** |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 476 | * iucv_declare_cpu |
| 477 | * @data: unused |
| 478 | * |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 479 | * Declare a interrupt buffer on this cpu. |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 480 | */ |
| 481 | static void iucv_declare_cpu(void *data) |
| 482 | { |
| 483 | int cpu = smp_processor_id(); |
| 484 | union iucv_param *parm; |
| 485 | int rc; |
| 486 | |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 487 | if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 488 | return; |
| 489 | |
| 490 | /* Declare interrupt buffer. */ |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 491 | parm = iucv_param_irq[cpu]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 492 | memset(parm, 0, sizeof(union iucv_param)); |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 493 | parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 494 | rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); |
| 495 | if (rc) { |
| 496 | char *err = "Unknown"; |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 497 | switch (rc) { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 498 | case 0x03: |
| 499 | err = "Directory error"; |
| 500 | break; |
| 501 | case 0x0a: |
| 502 | err = "Invalid length"; |
| 503 | break; |
| 504 | case 0x13: |
| 505 | err = "Buffer already exists"; |
| 506 | break; |
| 507 | case 0x3e: |
| 508 | err = "Buffer overlap"; |
| 509 | break; |
| 510 | case 0x5c: |
| 511 | err = "Paging or storage error"; |
| 512 | break; |
| 513 | } |
Joe Perches | 47c4cfc | 2014-09-09 21:17:31 -0700 | [diff] [blame] | 514 | pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n", |
| 515 | cpu, rc, err); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 516 | return; |
| 517 | } |
| 518 | |
| 519 | /* Set indication that an iucv buffer exists for this cpu. */ |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 520 | cpumask_set_cpu(cpu, &iucv_buffer_cpumask); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 521 | |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 522 | if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask)) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 523 | /* Enable iucv interrupts on this cpu. */ |
| 524 | iucv_allow_cpu(NULL); |
| 525 | else |
| 526 | /* Disable iucv interrupts on this cpu. */ |
| 527 | iucv_block_cpu(NULL); |
| 528 | } |
| 529 | |
| 530 | /** |
| 531 | * iucv_retrieve_cpu |
| 532 | * @data: unused |
| 533 | * |
| 534 | * Retrieve interrupt buffer on this cpu. |
| 535 | */ |
| 536 | static void iucv_retrieve_cpu(void *data) |
| 537 | { |
| 538 | int cpu = smp_processor_id(); |
| 539 | union iucv_param *parm; |
| 540 | |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 541 | if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 542 | return; |
| 543 | |
| 544 | /* Block iucv interrupts. */ |
| 545 | iucv_block_cpu(NULL); |
| 546 | |
| 547 | /* Retrieve interrupt buffer. */ |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 548 | parm = iucv_param_irq[cpu]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 549 | iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); |
| 550 | |
| 551 | /* Clear indication that an iucv buffer exists for this cpu. */ |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 552 | cpumask_clear_cpu(cpu, &iucv_buffer_cpumask); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | /** |
| 556 | * iucv_setmask_smp |
| 557 | * |
| 558 | * Allow iucv interrupts on all cpus. |
| 559 | */ |
| 560 | static void iucv_setmask_mp(void) |
| 561 | { |
| 562 | int cpu; |
| 563 | |
Heiko Carstens | 7b9d1b2 | 2008-06-09 15:50:30 -0700 | [diff] [blame] | 564 | get_online_cpus(); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 565 | for_each_online_cpu(cpu) |
| 566 | /* Enable all cpus with a declared buffer. */ |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 567 | if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) && |
| 568 | !cpumask_test_cpu(cpu, &iucv_irq_cpumask)) |
Heiko Carstens | 3bb447f | 2007-07-27 12:29:08 +0200 | [diff] [blame] | 569 | smp_call_function_single(cpu, iucv_allow_cpu, |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 570 | NULL, 1); |
Heiko Carstens | 7b9d1b2 | 2008-06-09 15:50:30 -0700 | [diff] [blame] | 571 | put_online_cpus(); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | /** |
| 575 | * iucv_setmask_up |
| 576 | * |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 577 | * Allow iucv interrupts on a single cpu. |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 578 | */ |
| 579 | static void iucv_setmask_up(void) |
| 580 | { |
| 581 | cpumask_t cpumask; |
| 582 | int cpu; |
| 583 | |
| 584 | /* Disable all cpu but the first in cpu_irq_cpumask. */ |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 585 | cpumask_copy(&cpumask, &iucv_irq_cpumask); |
| 586 | cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask); |
| 587 | for_each_cpu(cpu, &cpumask) |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 588 | smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | /** |
| 592 | * iucv_enable |
| 593 | * |
| 594 | * This function makes iucv ready for use. It allocates the pathid |
| 595 | * table, declares an iucv interrupt buffer and enables the iucv |
| 596 | * interrupts. Called when the first user has registered an iucv |
| 597 | * handler. |
| 598 | */ |
| 599 | static int iucv_enable(void) |
| 600 | { |
| 601 | size_t alloc_size; |
| 602 | int cpu, rc; |
| 603 | |
Heiko Carstens | f1d3e4d | 2009-01-05 18:09:02 -0800 | [diff] [blame] | 604 | get_online_cpus(); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 605 | rc = -ENOMEM; |
| 606 | alloc_size = iucv_max_pathid * sizeof(struct iucv_path); |
| 607 | iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); |
| 608 | if (!iucv_path_table) |
| 609 | goto out; |
| 610 | /* Declare per cpu buffers. */ |
| 611 | rc = -EIO; |
| 612 | for_each_online_cpu(cpu) |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 613 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 614 | if (cpumask_empty(&iucv_buffer_cpumask)) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 615 | /* No cpu could declare an iucv buffer. */ |
Heiko Carstens | f1d3e4d | 2009-01-05 18:09:02 -0800 | [diff] [blame] | 616 | goto out; |
Heiko Carstens | 7b9d1b2 | 2008-06-09 15:50:30 -0700 | [diff] [blame] | 617 | put_online_cpus(); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 618 | return 0; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 619 | out: |
Heiko Carstens | f1d3e4d | 2009-01-05 18:09:02 -0800 | [diff] [blame] | 620 | kfree(iucv_path_table); |
| 621 | iucv_path_table = NULL; |
| 622 | put_online_cpus(); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 623 | return rc; |
| 624 | } |
| 625 | |
| 626 | /** |
| 627 | * iucv_disable |
| 628 | * |
| 629 | * This function shuts down iucv. It disables iucv interrupts, retrieves |
| 630 | * the iucv interrupt buffer and frees the pathid table. Called after the |
| 631 | * last user unregister its iucv handler. |
| 632 | */ |
| 633 | static void iucv_disable(void) |
| 634 | { |
Heiko Carstens | 8b122ef | 2008-09-30 03:03:35 -0700 | [diff] [blame] | 635 | get_online_cpus(); |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 636 | on_each_cpu(iucv_retrieve_cpu, NULL, 1); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 637 | kfree(iucv_path_table); |
Heiko Carstens | f1d3e4d | 2009-01-05 18:09:02 -0800 | [diff] [blame] | 638 | iucv_path_table = NULL; |
| 639 | put_online_cpus(); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 640 | } |
| 641 | |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 642 | static void free_iucv_data(int cpu) |
| 643 | { |
| 644 | kfree(iucv_param_irq[cpu]); |
| 645 | iucv_param_irq[cpu] = NULL; |
| 646 | kfree(iucv_param[cpu]); |
| 647 | iucv_param[cpu] = NULL; |
| 648 | kfree(iucv_irq_data[cpu]); |
| 649 | iucv_irq_data[cpu] = NULL; |
| 650 | } |
| 651 | |
| 652 | static int alloc_iucv_data(int cpu) |
| 653 | { |
| 654 | /* Note: GFP_DMA used to get memory below 2G */ |
| 655 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), |
| 656 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
| 657 | if (!iucv_irq_data[cpu]) |
| 658 | goto out_free; |
| 659 | |
| 660 | /* Allocate parameter blocks. */ |
| 661 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), |
| 662 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
| 663 | if (!iucv_param[cpu]) |
| 664 | goto out_free; |
| 665 | |
| 666 | iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), |
| 667 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
| 668 | if (!iucv_param_irq[cpu]) |
| 669 | goto out_free; |
| 670 | |
| 671 | return 0; |
| 672 | |
| 673 | out_free: |
| 674 | free_iucv_data(cpu); |
| 675 | return -ENOMEM; |
| 676 | } |
| 677 | |
Paul Gortmaker | 013dbb3 | 2013-06-19 14:32:33 -0400 | [diff] [blame] | 678 | static int iucv_cpu_notify(struct notifier_block *self, |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 679 | unsigned long action, void *hcpu) |
| 680 | { |
| 681 | cpumask_t cpumask; |
| 682 | long cpu = (long) hcpu; |
| 683 | |
| 684 | switch (action) { |
| 685 | case CPU_UP_PREPARE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 686 | case CPU_UP_PREPARE_FROZEN: |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 687 | if (alloc_iucv_data(cpu)) |
Akinobu Mita | 92e99a9 | 2010-05-26 14:43:33 -0700 | [diff] [blame] | 688 | return notifier_from_errno(-ENOMEM); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 689 | break; |
| 690 | case CPU_UP_CANCELED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 691 | case CPU_UP_CANCELED_FROZEN: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 692 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 693 | case CPU_DEAD_FROZEN: |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 694 | free_iucv_data(cpu); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 695 | break; |
| 696 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 697 | case CPU_ONLINE_FROZEN: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 698 | case CPU_DOWN_FAILED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 699 | case CPU_DOWN_FAILED_FROZEN: |
Heiko Carstens | f1d3e4d | 2009-01-05 18:09:02 -0800 | [diff] [blame] | 700 | if (!iucv_path_table) |
| 701 | break; |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 702 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 703 | break; |
| 704 | case CPU_DOWN_PREPARE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 705 | case CPU_DOWN_PREPARE_FROZEN: |
Heiko Carstens | f1d3e4d | 2009-01-05 18:09:02 -0800 | [diff] [blame] | 706 | if (!iucv_path_table) |
| 707 | break; |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 708 | cpumask_copy(&cpumask, &iucv_buffer_cpumask); |
| 709 | cpumask_clear_cpu(cpu, &cpumask); |
| 710 | if (cpumask_empty(&cpumask)) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 711 | /* Can't offline last IUCV enabled cpu. */ |
Akinobu Mita | 92e99a9 | 2010-05-26 14:43:33 -0700 | [diff] [blame] | 712 | return notifier_from_errno(-EINVAL); |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 713 | smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 714 | if (cpumask_empty(&iucv_irq_cpumask)) |
| 715 | smp_call_function_single( |
| 716 | cpumask_first(&iucv_buffer_cpumask), |
| 717 | iucv_allow_cpu, NULL, 1); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 718 | break; |
| 719 | } |
| 720 | return NOTIFY_OK; |
| 721 | } |
| 722 | |
Heiko Carstens | f1494ed | 2008-06-09 15:49:57 -0700 | [diff] [blame] | 723 | static struct notifier_block __refdata iucv_cpu_notifier = { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 724 | .notifier_call = iucv_cpu_notify, |
| 725 | }; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 726 | |
| 727 | /** |
| 728 | * iucv_sever_pathid |
| 729 | * @pathid: path identification number. |
| 730 | * @userdata: 16-bytes of user data. |
| 731 | * |
| 732 | * Sever an iucv path to free up the pathid. Used internally. |
| 733 | */ |
Ursula Braun | 91e60eb | 2015-09-18 16:06:52 +0200 | [diff] [blame] | 734 | static int iucv_sever_pathid(u16 pathid, u8 *userdata) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 735 | { |
| 736 | union iucv_param *parm; |
| 737 | |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 738 | parm = iucv_param_irq[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 739 | memset(parm, 0, sizeof(union iucv_param)); |
| 740 | if (userdata) |
| 741 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
| 742 | parm->ctrl.ippathid = pathid; |
| 743 | return iucv_call_b2f0(IUCV_SEVER, parm); |
| 744 | } |
| 745 | |
| 746 | /** |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 747 | * __iucv_cleanup_queue |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 748 | * @dummy: unused dummy argument |
| 749 | * |
| 750 | * Nop function called via smp_call_function to force work items from |
| 751 | * pending external iucv interrupts to the work queue. |
| 752 | */ |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 753 | static void __iucv_cleanup_queue(void *dummy) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 754 | { |
| 755 | } |
| 756 | |
| 757 | /** |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 758 | * iucv_cleanup_queue |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 759 | * |
| 760 | * Function called after a path has been severed to find all remaining |
| 761 | * work items for the now stale pathid. The caller needs to hold the |
| 762 | * iucv_table_lock. |
| 763 | */ |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 764 | static void iucv_cleanup_queue(void) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 765 | { |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 766 | struct iucv_irq_list *p, *n; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 767 | |
| 768 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 769 | * When a path is severed, the pathid can be reused immediately |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 770 | * on a iucv connect or a connection pending interrupt. Remove |
| 771 | * all entries from the task queue that refer to a stale pathid |
| 772 | * (iucv_path_table[ix] == NULL). Only then do the iucv connect |
| 773 | * or deliver the connection pending interrupt. To get all the |
| 774 | * pending interrupts force them to the work queue by calling |
| 775 | * an empty function on all cpus. |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 776 | */ |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 777 | smp_call_function(__iucv_cleanup_queue, NULL, 1); |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 778 | spin_lock_irq(&iucv_queue_lock); |
| 779 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) { |
| 780 | /* Remove stale work items from the task queue. */ |
| 781 | if (iucv_path_table[p->data.ippathid] == NULL) { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 782 | list_del(&p->list); |
| 783 | kfree(p); |
| 784 | } |
| 785 | } |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 786 | spin_unlock_irq(&iucv_queue_lock); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 787 | } |
| 788 | |
| 789 | /** |
| 790 | * iucv_register: |
| 791 | * @handler: address of iucv handler structure |
| 792 | * @smp: != 0 indicates that the handler can deal with out of order messages |
| 793 | * |
| 794 | * Registers a driver with IUCV. |
| 795 | * |
| 796 | * Returns 0 on success, -ENOMEM if the memory allocation for the pathid |
| 797 | * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. |
| 798 | */ |
| 799 | int iucv_register(struct iucv_handler *handler, int smp) |
| 800 | { |
| 801 | int rc; |
| 802 | |
| 803 | if (!iucv_available) |
| 804 | return -ENOSYS; |
| 805 | mutex_lock(&iucv_register_mutex); |
| 806 | if (!smp) |
| 807 | iucv_nonsmp_handler++; |
| 808 | if (list_empty(&iucv_handler_list)) { |
| 809 | rc = iucv_enable(); |
| 810 | if (rc) |
| 811 | goto out_mutex; |
| 812 | } else if (!smp && iucv_nonsmp_handler == 1) |
| 813 | iucv_setmask_up(); |
| 814 | INIT_LIST_HEAD(&handler->paths); |
| 815 | |
Ursula Braun | 435bc9d | 2008-02-07 18:06:52 -0800 | [diff] [blame] | 816 | spin_lock_bh(&iucv_table_lock); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 817 | list_add_tail(&handler->list, &iucv_handler_list); |
Ursula Braun | 435bc9d | 2008-02-07 18:06:52 -0800 | [diff] [blame] | 818 | spin_unlock_bh(&iucv_table_lock); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 819 | rc = 0; |
| 820 | out_mutex: |
| 821 | mutex_unlock(&iucv_register_mutex); |
| 822 | return rc; |
| 823 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 824 | EXPORT_SYMBOL(iucv_register); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 825 | |
| 826 | /** |
| 827 | * iucv_unregister |
| 828 | * @handler: address of iucv handler structure |
| 829 | * @smp: != 0 indicates that the handler can deal with out of order messages |
| 830 | * |
| 831 | * Unregister driver from IUCV. |
| 832 | */ |
| 833 | void iucv_unregister(struct iucv_handler *handler, int smp) |
| 834 | { |
| 835 | struct iucv_path *p, *n; |
| 836 | |
| 837 | mutex_lock(&iucv_register_mutex); |
| 838 | spin_lock_bh(&iucv_table_lock); |
| 839 | /* Remove handler from the iucv_handler_list. */ |
| 840 | list_del_init(&handler->list); |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 841 | /* Sever all pathids still referring to the handler. */ |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 842 | list_for_each_entry_safe(p, n, &handler->paths, list) { |
| 843 | iucv_sever_pathid(p->pathid, NULL); |
| 844 | iucv_path_table[p->pathid] = NULL; |
| 845 | list_del(&p->list); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 846 | iucv_path_free(p); |
| 847 | } |
| 848 | spin_unlock_bh(&iucv_table_lock); |
| 849 | if (!smp) |
| 850 | iucv_nonsmp_handler--; |
| 851 | if (list_empty(&iucv_handler_list)) |
| 852 | iucv_disable(); |
| 853 | else if (!smp && iucv_nonsmp_handler == 0) |
| 854 | iucv_setmask_mp(); |
| 855 | mutex_unlock(&iucv_register_mutex); |
| 856 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 857 | EXPORT_SYMBOL(iucv_unregister); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 858 | |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 859 | static int iucv_reboot_event(struct notifier_block *this, |
| 860 | unsigned long event, void *ptr) |
| 861 | { |
Ursula Braun | 5db79c0 | 2011-05-12 18:45:07 +0000 | [diff] [blame] | 862 | int i; |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 863 | |
Hendrik Brueckner | c0048de | 2013-02-06 16:12:03 +0100 | [diff] [blame] | 864 | if (cpumask_empty(&iucv_irq_cpumask)) |
| 865 | return NOTIFY_DONE; |
| 866 | |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 867 | get_online_cpus(); |
Hendrik Brueckner | c0048de | 2013-02-06 16:12:03 +0100 | [diff] [blame] | 868 | on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 869 | preempt_disable(); |
| 870 | for (i = 0; i < iucv_max_pathid; i++) { |
| 871 | if (iucv_path_table[i]) |
Ursula Braun | 5db79c0 | 2011-05-12 18:45:07 +0000 | [diff] [blame] | 872 | iucv_sever_pathid(i, NULL); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 873 | } |
| 874 | preempt_enable(); |
| 875 | put_online_cpus(); |
| 876 | iucv_disable(); |
| 877 | return NOTIFY_DONE; |
| 878 | } |
| 879 | |
| 880 | static struct notifier_block iucv_reboot_notifier = { |
| 881 | .notifier_call = iucv_reboot_event, |
| 882 | }; |
| 883 | |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 884 | /** |
| 885 | * iucv_path_accept |
| 886 | * @path: address of iucv path structure |
| 887 | * @handler: address of iucv handler structure |
| 888 | * @userdata: 16 bytes of data reflected to the communication partner |
| 889 | * @private: private data passed to interrupt handlers for this path |
| 890 | * |
| 891 | * This function is issued after the user received a connection pending |
| 892 | * external interrupt and now wishes to complete the IUCV communication path. |
| 893 | * |
| 894 | * Returns the result of the CP IUCV call. |
| 895 | */ |
| 896 | int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, |
Ursula Braun | 91e60eb | 2015-09-18 16:06:52 +0200 | [diff] [blame] | 897 | u8 *userdata, void *private) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 898 | { |
| 899 | union iucv_param *parm; |
| 900 | int rc; |
| 901 | |
| 902 | local_bh_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 903 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 904 | rc = -EIO; |
| 905 | goto out; |
| 906 | } |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 907 | /* Prepare parameter block. */ |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 908 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 909 | memset(parm, 0, sizeof(union iucv_param)); |
| 910 | parm->ctrl.ippathid = path->pathid; |
| 911 | parm->ctrl.ipmsglim = path->msglim; |
| 912 | if (userdata) |
| 913 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
| 914 | parm->ctrl.ipflags1 = path->flags; |
| 915 | |
| 916 | rc = iucv_call_b2f0(IUCV_ACCEPT, parm); |
| 917 | if (!rc) { |
| 918 | path->private = private; |
| 919 | path->msglim = parm->ctrl.ipmsglim; |
| 920 | path->flags = parm->ctrl.ipflags1; |
| 921 | } |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 922 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 923 | local_bh_enable(); |
| 924 | return rc; |
| 925 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 926 | EXPORT_SYMBOL(iucv_path_accept); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 927 | |
| 928 | /** |
| 929 | * iucv_path_connect |
| 930 | * @path: address of iucv path structure |
| 931 | * @handler: address of iucv handler structure |
| 932 | * @userid: 8-byte user identification |
| 933 | * @system: 8-byte target system identification |
| 934 | * @userdata: 16 bytes of data reflected to the communication partner |
| 935 | * @private: private data passed to interrupt handlers for this path |
| 936 | * |
| 937 | * This function establishes an IUCV path. Although the connect may complete |
| 938 | * successfully, you are not able to use the path until you receive an IUCV |
| 939 | * Connection Complete external interrupt. |
| 940 | * |
| 941 | * Returns the result of the CP IUCV call. |
| 942 | */ |
| 943 | int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, |
Ursula Braun | 91e60eb | 2015-09-18 16:06:52 +0200 | [diff] [blame] | 944 | u8 *userid, u8 *system, u8 *userdata, |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 945 | void *private) |
| 946 | { |
| 947 | union iucv_param *parm; |
| 948 | int rc; |
| 949 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 950 | spin_lock_bh(&iucv_table_lock); |
| 951 | iucv_cleanup_queue(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 952 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 953 | rc = -EIO; |
| 954 | goto out; |
| 955 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 956 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 957 | memset(parm, 0, sizeof(union iucv_param)); |
| 958 | parm->ctrl.ipmsglim = path->msglim; |
| 959 | parm->ctrl.ipflags1 = path->flags; |
| 960 | if (userid) { |
| 961 | memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); |
| 962 | ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); |
| 963 | EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); |
| 964 | } |
| 965 | if (system) { |
| 966 | memcpy(parm->ctrl.iptarget, system, |
| 967 | sizeof(parm->ctrl.iptarget)); |
| 968 | ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); |
| 969 | EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); |
| 970 | } |
| 971 | if (userdata) |
| 972 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
| 973 | |
| 974 | rc = iucv_call_b2f0(IUCV_CONNECT, parm); |
| 975 | if (!rc) { |
| 976 | if (parm->ctrl.ippathid < iucv_max_pathid) { |
| 977 | path->pathid = parm->ctrl.ippathid; |
| 978 | path->msglim = parm->ctrl.ipmsglim; |
| 979 | path->flags = parm->ctrl.ipflags1; |
| 980 | path->handler = handler; |
| 981 | path->private = private; |
| 982 | list_add_tail(&path->list, &handler->paths); |
| 983 | iucv_path_table[path->pathid] = path; |
| 984 | } else { |
| 985 | iucv_sever_pathid(parm->ctrl.ippathid, |
| 986 | iucv_error_pathid); |
| 987 | rc = -EIO; |
| 988 | } |
| 989 | } |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 990 | out: |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 991 | spin_unlock_bh(&iucv_table_lock); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 992 | return rc; |
| 993 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 994 | EXPORT_SYMBOL(iucv_path_connect); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 995 | |
| 996 | /** |
| 997 | * iucv_path_quiesce: |
| 998 | * @path: address of iucv path structure |
| 999 | * @userdata: 16 bytes of data reflected to the communication partner |
| 1000 | * |
| 1001 | * This function temporarily suspends incoming messages on an IUCV path. |
| 1002 | * You can later reactivate the path by invoking the iucv_resume function. |
| 1003 | * |
| 1004 | * Returns the result from the CP IUCV call. |
| 1005 | */ |
Ursula Braun | 91e60eb | 2015-09-18 16:06:52 +0200 | [diff] [blame] | 1006 | int iucv_path_quiesce(struct iucv_path *path, u8 *userdata) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1007 | { |
| 1008 | union iucv_param *parm; |
| 1009 | int rc; |
| 1010 | |
| 1011 | local_bh_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1012 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1013 | rc = -EIO; |
| 1014 | goto out; |
| 1015 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1016 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1017 | memset(parm, 0, sizeof(union iucv_param)); |
| 1018 | if (userdata) |
| 1019 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
| 1020 | parm->ctrl.ippathid = path->pathid; |
| 1021 | rc = iucv_call_b2f0(IUCV_QUIESCE, parm); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1022 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1023 | local_bh_enable(); |
| 1024 | return rc; |
| 1025 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1026 | EXPORT_SYMBOL(iucv_path_quiesce); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1027 | |
| 1028 | /** |
| 1029 | * iucv_path_resume: |
| 1030 | * @path: address of iucv path structure |
| 1031 | * @userdata: 16 bytes of data reflected to the communication partner |
| 1032 | * |
| 1033 | * This function resumes incoming messages on an IUCV path that has |
| 1034 | * been stopped with iucv_path_quiesce. |
| 1035 | * |
| 1036 | * Returns the result from the CP IUCV call. |
| 1037 | */ |
Ursula Braun | 91e60eb | 2015-09-18 16:06:52 +0200 | [diff] [blame] | 1038 | int iucv_path_resume(struct iucv_path *path, u8 *userdata) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1039 | { |
| 1040 | union iucv_param *parm; |
| 1041 | int rc; |
| 1042 | |
| 1043 | local_bh_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1044 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1045 | rc = -EIO; |
| 1046 | goto out; |
| 1047 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1048 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1049 | memset(parm, 0, sizeof(union iucv_param)); |
| 1050 | if (userdata) |
| 1051 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
| 1052 | parm->ctrl.ippathid = path->pathid; |
| 1053 | rc = iucv_call_b2f0(IUCV_RESUME, parm); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1054 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1055 | local_bh_enable(); |
| 1056 | return rc; |
| 1057 | } |
| 1058 | |
| 1059 | /** |
| 1060 | * iucv_path_sever |
| 1061 | * @path: address of iucv path structure |
| 1062 | * @userdata: 16 bytes of data reflected to the communication partner |
| 1063 | * |
| 1064 | * This function terminates an IUCV path. |
| 1065 | * |
| 1066 | * Returns the result from the CP IUCV call. |
| 1067 | */ |
Ursula Braun | 91e60eb | 2015-09-18 16:06:52 +0200 | [diff] [blame] | 1068 | int iucv_path_sever(struct iucv_path *path, u8 *userdata) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1069 | { |
| 1070 | int rc; |
| 1071 | |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1072 | preempt_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1073 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1074 | rc = -EIO; |
| 1075 | goto out; |
| 1076 | } |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1077 | if (iucv_active_cpu != smp_processor_id()) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1078 | spin_lock_bh(&iucv_table_lock); |
| 1079 | rc = iucv_sever_pathid(path->pathid, userdata); |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 1080 | iucv_path_table[path->pathid] = NULL; |
| 1081 | list_del_init(&path->list); |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1082 | if (iucv_active_cpu != smp_processor_id()) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1083 | spin_unlock_bh(&iucv_table_lock); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1084 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1085 | preempt_enable(); |
| 1086 | return rc; |
| 1087 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1088 | EXPORT_SYMBOL(iucv_path_sever); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1089 | |
| 1090 | /** |
| 1091 | * iucv_message_purge |
| 1092 | * @path: address of iucv path structure |
| 1093 | * @msg: address of iucv msg structure |
| 1094 | * @srccls: source class of message |
| 1095 | * |
| 1096 | * Cancels a message you have sent. |
| 1097 | * |
| 1098 | * Returns the result from the CP IUCV call. |
| 1099 | */ |
| 1100 | int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, |
| 1101 | u32 srccls) |
| 1102 | { |
| 1103 | union iucv_param *parm; |
| 1104 | int rc; |
| 1105 | |
| 1106 | local_bh_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1107 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1108 | rc = -EIO; |
| 1109 | goto out; |
| 1110 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1111 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1112 | memset(parm, 0, sizeof(union iucv_param)); |
| 1113 | parm->purge.ippathid = path->pathid; |
| 1114 | parm->purge.ipmsgid = msg->id; |
| 1115 | parm->purge.ipsrccls = srccls; |
| 1116 | parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; |
| 1117 | rc = iucv_call_b2f0(IUCV_PURGE, parm); |
| 1118 | if (!rc) { |
| 1119 | msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; |
| 1120 | msg->tag = parm->purge.ipmsgtag; |
| 1121 | } |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1122 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1123 | local_bh_enable(); |
| 1124 | return rc; |
| 1125 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1126 | EXPORT_SYMBOL(iucv_message_purge); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1127 | |
| 1128 | /** |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1129 | * iucv_message_receive_iprmdata |
| 1130 | * @path: address of iucv path structure |
| 1131 | * @msg: address of iucv msg structure |
| 1132 | * @flags: how the message is received (IUCV_IPBUFLST) |
| 1133 | * @buffer: address of data buffer or address of struct iucv_array |
| 1134 | * @size: length of data buffer |
| 1135 | * @residual: |
| 1136 | * |
| 1137 | * Internal function used by iucv_message_receive and __iucv_message_receive |
| 1138 | * to receive RMDATA data stored in struct iucv_message. |
| 1139 | */ |
| 1140 | static int iucv_message_receive_iprmdata(struct iucv_path *path, |
| 1141 | struct iucv_message *msg, |
| 1142 | u8 flags, void *buffer, |
| 1143 | size_t size, size_t *residual) |
| 1144 | { |
| 1145 | struct iucv_array *array; |
| 1146 | u8 *rmmsg; |
| 1147 | size_t copy; |
| 1148 | |
| 1149 | /* |
| 1150 | * Message is 8 bytes long and has been stored to the |
| 1151 | * message descriptor itself. |
| 1152 | */ |
| 1153 | if (residual) |
| 1154 | *residual = abs(size - 8); |
| 1155 | rmmsg = msg->rmmsg; |
| 1156 | if (flags & IUCV_IPBUFLST) { |
| 1157 | /* Copy to struct iucv_array. */ |
| 1158 | size = (size < 8) ? size : 8; |
| 1159 | for (array = buffer; size > 0; array++) { |
| 1160 | copy = min_t(size_t, size, array->length); |
| 1161 | memcpy((u8 *)(addr_t) array->address, |
| 1162 | rmmsg, copy); |
| 1163 | rmmsg += copy; |
| 1164 | size -= copy; |
| 1165 | } |
| 1166 | } else { |
| 1167 | /* Copy to direct buffer. */ |
| 1168 | memcpy(buffer, rmmsg, min_t(size_t, size, 8)); |
| 1169 | } |
| 1170 | return 0; |
| 1171 | } |
| 1172 | |
| 1173 | /** |
| 1174 | * __iucv_message_receive |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1175 | * @path: address of iucv path structure |
| 1176 | * @msg: address of iucv msg structure |
| 1177 | * @flags: how the message is received (IUCV_IPBUFLST) |
| 1178 | * @buffer: address of data buffer or address of struct iucv_array |
| 1179 | * @size: length of data buffer |
| 1180 | * @residual: |
| 1181 | * |
| 1182 | * This function receives messages that are being sent to you over |
| 1183 | * established paths. This function will deal with RMDATA messages |
| 1184 | * embedded in struct iucv_message as well. |
| 1185 | * |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1186 | * Locking: no locking |
| 1187 | * |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1188 | * Returns the result from the CP IUCV call. |
| 1189 | */ |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1190 | int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
| 1191 | u8 flags, void *buffer, size_t size, size_t *residual) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1192 | { |
| 1193 | union iucv_param *parm; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1194 | int rc; |
| 1195 | |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1196 | if (msg->flags & IUCV_IPRMDATA) |
| 1197 | return iucv_message_receive_iprmdata(path, msg, flags, |
| 1198 | buffer, size, residual); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1199 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1200 | rc = -EIO; |
| 1201 | goto out; |
| 1202 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1203 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1204 | memset(parm, 0, sizeof(union iucv_param)); |
| 1205 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; |
| 1206 | parm->db.ipbfln1f = (u32) size; |
| 1207 | parm->db.ipmsgid = msg->id; |
| 1208 | parm->db.ippathid = path->pathid; |
| 1209 | parm->db.iptrgcls = msg->class; |
| 1210 | parm->db.ipflags1 = (flags | IUCV_IPFGPID | |
| 1211 | IUCV_IPFGMID | IUCV_IPTRGCLS); |
| 1212 | rc = iucv_call_b2f0(IUCV_RECEIVE, parm); |
| 1213 | if (!rc || rc == 5) { |
| 1214 | msg->flags = parm->db.ipflags1; |
| 1215 | if (residual) |
| 1216 | *residual = parm->db.ipbfln1f; |
| 1217 | } |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1218 | out: |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1219 | return rc; |
| 1220 | } |
| 1221 | EXPORT_SYMBOL(__iucv_message_receive); |
| 1222 | |
| 1223 | /** |
| 1224 | * iucv_message_receive |
| 1225 | * @path: address of iucv path structure |
| 1226 | * @msg: address of iucv msg structure |
| 1227 | * @flags: how the message is received (IUCV_IPBUFLST) |
| 1228 | * @buffer: address of data buffer or address of struct iucv_array |
| 1229 | * @size: length of data buffer |
| 1230 | * @residual: |
| 1231 | * |
| 1232 | * This function receives messages that are being sent to you over |
| 1233 | * established paths. This function will deal with RMDATA messages |
| 1234 | * embedded in struct iucv_message as well. |
| 1235 | * |
| 1236 | * Locking: local_bh_enable/local_bh_disable |
| 1237 | * |
| 1238 | * Returns the result from the CP IUCV call. |
| 1239 | */ |
| 1240 | int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
| 1241 | u8 flags, void *buffer, size_t size, size_t *residual) |
| 1242 | { |
| 1243 | int rc; |
| 1244 | |
| 1245 | if (msg->flags & IUCV_IPRMDATA) |
| 1246 | return iucv_message_receive_iprmdata(path, msg, flags, |
| 1247 | buffer, size, residual); |
| 1248 | local_bh_disable(); |
| 1249 | rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1250 | local_bh_enable(); |
| 1251 | return rc; |
| 1252 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1253 | EXPORT_SYMBOL(iucv_message_receive); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1254 | |
| 1255 | /** |
| 1256 | * iucv_message_reject |
| 1257 | * @path: address of iucv path structure |
| 1258 | * @msg: address of iucv msg structure |
| 1259 | * |
| 1260 | * The reject function refuses a specified message. Between the time you |
| 1261 | * are notified of a message and the time that you complete the message, |
| 1262 | * the message may be rejected. |
| 1263 | * |
| 1264 | * Returns the result from the CP IUCV call. |
| 1265 | */ |
| 1266 | int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) |
| 1267 | { |
| 1268 | union iucv_param *parm; |
| 1269 | int rc; |
| 1270 | |
| 1271 | local_bh_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1272 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1273 | rc = -EIO; |
| 1274 | goto out; |
| 1275 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1276 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1277 | memset(parm, 0, sizeof(union iucv_param)); |
| 1278 | parm->db.ippathid = path->pathid; |
| 1279 | parm->db.ipmsgid = msg->id; |
| 1280 | parm->db.iptrgcls = msg->class; |
| 1281 | parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); |
| 1282 | rc = iucv_call_b2f0(IUCV_REJECT, parm); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1283 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1284 | local_bh_enable(); |
| 1285 | return rc; |
| 1286 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1287 | EXPORT_SYMBOL(iucv_message_reject); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1288 | |
| 1289 | /** |
| 1290 | * iucv_message_reply |
| 1291 | * @path: address of iucv path structure |
| 1292 | * @msg: address of iucv msg structure |
| 1293 | * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) |
| 1294 | * @reply: address of reply data buffer or address of struct iucv_array |
| 1295 | * @size: length of reply data buffer |
| 1296 | * |
| 1297 | * This function responds to the two-way messages that you receive. You |
| 1298 | * must identify completely the message to which you wish to reply. ie, |
| 1299 | * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into |
| 1300 | * the parameter list. |
| 1301 | * |
| 1302 | * Returns the result from the CP IUCV call. |
| 1303 | */ |
| 1304 | int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, |
| 1305 | u8 flags, void *reply, size_t size) |
| 1306 | { |
| 1307 | union iucv_param *parm; |
| 1308 | int rc; |
| 1309 | |
| 1310 | local_bh_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1311 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1312 | rc = -EIO; |
| 1313 | goto out; |
| 1314 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1315 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1316 | memset(parm, 0, sizeof(union iucv_param)); |
| 1317 | if (flags & IUCV_IPRMDATA) { |
| 1318 | parm->dpl.ippathid = path->pathid; |
| 1319 | parm->dpl.ipflags1 = flags; |
| 1320 | parm->dpl.ipmsgid = msg->id; |
| 1321 | parm->dpl.iptrgcls = msg->class; |
| 1322 | memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); |
| 1323 | } else { |
| 1324 | parm->db.ipbfadr1 = (u32)(addr_t) reply; |
| 1325 | parm->db.ipbfln1f = (u32) size; |
| 1326 | parm->db.ippathid = path->pathid; |
| 1327 | parm->db.ipflags1 = flags; |
| 1328 | parm->db.ipmsgid = msg->id; |
| 1329 | parm->db.iptrgcls = msg->class; |
| 1330 | } |
| 1331 | rc = iucv_call_b2f0(IUCV_REPLY, parm); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1332 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1333 | local_bh_enable(); |
| 1334 | return rc; |
| 1335 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1336 | EXPORT_SYMBOL(iucv_message_reply); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1337 | |
| 1338 | /** |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1339 | * __iucv_message_send |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1340 | * @path: address of iucv path structure |
| 1341 | * @msg: address of iucv msg structure |
| 1342 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) |
| 1343 | * @srccls: source class of message |
| 1344 | * @buffer: address of send buffer or address of struct iucv_array |
| 1345 | * @size: length of send buffer |
| 1346 | * |
| 1347 | * This function transmits data to another application. Data to be |
| 1348 | * transmitted is in a buffer and this is a one-way message and the |
| 1349 | * receiver will not reply to the message. |
| 1350 | * |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1351 | * Locking: no locking |
| 1352 | * |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1353 | * Returns the result from the CP IUCV call. |
| 1354 | */ |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1355 | int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1356 | u8 flags, u32 srccls, void *buffer, size_t size) |
| 1357 | { |
| 1358 | union iucv_param *parm; |
| 1359 | int rc; |
| 1360 | |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1361 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1362 | rc = -EIO; |
| 1363 | goto out; |
| 1364 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1365 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1366 | memset(parm, 0, sizeof(union iucv_param)); |
| 1367 | if (flags & IUCV_IPRMDATA) { |
| 1368 | /* Message of 8 bytes can be placed into the parameter list. */ |
| 1369 | parm->dpl.ippathid = path->pathid; |
| 1370 | parm->dpl.ipflags1 = flags | IUCV_IPNORPY; |
| 1371 | parm->dpl.iptrgcls = msg->class; |
| 1372 | parm->dpl.ipsrccls = srccls; |
| 1373 | parm->dpl.ipmsgtag = msg->tag; |
| 1374 | memcpy(parm->dpl.iprmmsg, buffer, 8); |
| 1375 | } else { |
| 1376 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; |
| 1377 | parm->db.ipbfln1f = (u32) size; |
| 1378 | parm->db.ippathid = path->pathid; |
| 1379 | parm->db.ipflags1 = flags | IUCV_IPNORPY; |
| 1380 | parm->db.iptrgcls = msg->class; |
| 1381 | parm->db.ipsrccls = srccls; |
| 1382 | parm->db.ipmsgtag = msg->tag; |
| 1383 | } |
| 1384 | rc = iucv_call_b2f0(IUCV_SEND, parm); |
| 1385 | if (!rc) |
| 1386 | msg->id = parm->db.ipmsgid; |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1387 | out: |
Hendrik Brueckner | 91d5d45e | 2008-12-25 13:38:58 +0100 | [diff] [blame] | 1388 | return rc; |
| 1389 | } |
| 1390 | EXPORT_SYMBOL(__iucv_message_send); |
| 1391 | |
| 1392 | /** |
| 1393 | * iucv_message_send |
| 1394 | * @path: address of iucv path structure |
| 1395 | * @msg: address of iucv msg structure |
| 1396 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) |
| 1397 | * @srccls: source class of message |
| 1398 | * @buffer: address of send buffer or address of struct iucv_array |
| 1399 | * @size: length of send buffer |
| 1400 | * |
| 1401 | * This function transmits data to another application. Data to be |
| 1402 | * transmitted is in a buffer and this is a one-way message and the |
| 1403 | * receiver will not reply to the message. |
| 1404 | * |
| 1405 | * Locking: local_bh_enable/local_bh_disable |
| 1406 | * |
| 1407 | * Returns the result from the CP IUCV call. |
| 1408 | */ |
| 1409 | int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
| 1410 | u8 flags, u32 srccls, void *buffer, size_t size) |
| 1411 | { |
| 1412 | int rc; |
| 1413 | |
| 1414 | local_bh_disable(); |
| 1415 | rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1416 | local_bh_enable(); |
| 1417 | return rc; |
| 1418 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1419 | EXPORT_SYMBOL(iucv_message_send); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1420 | |
| 1421 | /** |
| 1422 | * iucv_message_send2way |
| 1423 | * @path: address of iucv path structure |
| 1424 | * @msg: address of iucv msg structure |
| 1425 | * @flags: how the message is sent and the reply is received |
| 1426 | * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) |
| 1427 | * @srccls: source class of message |
| 1428 | * @buffer: address of send buffer or address of struct iucv_array |
| 1429 | * @size: length of send buffer |
| 1430 | * @ansbuf: address of answer buffer or address of struct iucv_array |
| 1431 | * @asize: size of reply buffer |
| 1432 | * |
| 1433 | * This function transmits data to another application. Data to be |
| 1434 | * transmitted is in a buffer. The receiver of the send is expected to |
| 1435 | * reply to the message and a buffer is provided into which IUCV moves |
| 1436 | * the reply to this message. |
| 1437 | * |
| 1438 | * Returns the result from the CP IUCV call. |
| 1439 | */ |
| 1440 | int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, |
| 1441 | u8 flags, u32 srccls, void *buffer, size_t size, |
| 1442 | void *answer, size_t asize, size_t *residual) |
| 1443 | { |
| 1444 | union iucv_param *parm; |
| 1445 | int rc; |
| 1446 | |
| 1447 | local_bh_disable(); |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1448 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1449 | rc = -EIO; |
| 1450 | goto out; |
| 1451 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1452 | parm = iucv_param[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1453 | memset(parm, 0, sizeof(union iucv_param)); |
| 1454 | if (flags & IUCV_IPRMDATA) { |
| 1455 | parm->dpl.ippathid = path->pathid; |
| 1456 | parm->dpl.ipflags1 = path->flags; /* priority message */ |
| 1457 | parm->dpl.iptrgcls = msg->class; |
| 1458 | parm->dpl.ipsrccls = srccls; |
| 1459 | parm->dpl.ipmsgtag = msg->tag; |
| 1460 | parm->dpl.ipbfadr2 = (u32)(addr_t) answer; |
| 1461 | parm->dpl.ipbfln2f = (u32) asize; |
| 1462 | memcpy(parm->dpl.iprmmsg, buffer, 8); |
| 1463 | } else { |
| 1464 | parm->db.ippathid = path->pathid; |
| 1465 | parm->db.ipflags1 = path->flags; /* priority message */ |
| 1466 | parm->db.iptrgcls = msg->class; |
| 1467 | parm->db.ipsrccls = srccls; |
| 1468 | parm->db.ipmsgtag = msg->tag; |
| 1469 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; |
| 1470 | parm->db.ipbfln1f = (u32) size; |
| 1471 | parm->db.ipbfadr2 = (u32)(addr_t) answer; |
| 1472 | parm->db.ipbfln2f = (u32) asize; |
| 1473 | } |
| 1474 | rc = iucv_call_b2f0(IUCV_SEND, parm); |
| 1475 | if (!rc) |
| 1476 | msg->id = parm->db.ipmsgid; |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 1477 | out: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1478 | local_bh_enable(); |
| 1479 | return rc; |
| 1480 | } |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1481 | EXPORT_SYMBOL(iucv_message_send2way); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1482 | |
| 1483 | /** |
| 1484 | * iucv_path_pending |
| 1485 | * @data: Pointer to external interrupt buffer |
| 1486 | * |
| 1487 | * Process connection pending work item. Called from tasklet while holding |
| 1488 | * iucv_table_lock. |
| 1489 | */ |
| 1490 | struct iucv_path_pending { |
| 1491 | u16 ippathid; |
| 1492 | u8 ipflags1; |
| 1493 | u8 iptype; |
| 1494 | u16 ipmsglim; |
| 1495 | u16 res1; |
| 1496 | u8 ipvmid[8]; |
| 1497 | u8 ipuser[16]; |
| 1498 | u32 res3; |
| 1499 | u8 ippollfg; |
| 1500 | u8 res4[3]; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1501 | } __packed; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1502 | |
| 1503 | static void iucv_path_pending(struct iucv_irq_data *data) |
| 1504 | { |
| 1505 | struct iucv_path_pending *ipp = (void *) data; |
| 1506 | struct iucv_handler *handler; |
| 1507 | struct iucv_path *path; |
| 1508 | char *error; |
| 1509 | |
| 1510 | BUG_ON(iucv_path_table[ipp->ippathid]); |
| 1511 | /* New pathid, handler found. Create a new path struct. */ |
| 1512 | error = iucv_error_no_memory; |
| 1513 | path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); |
| 1514 | if (!path) |
| 1515 | goto out_sever; |
| 1516 | path->pathid = ipp->ippathid; |
| 1517 | iucv_path_table[path->pathid] = path; |
| 1518 | EBCASC(ipp->ipvmid, 8); |
| 1519 | |
| 1520 | /* Call registered handler until one is found that wants the path. */ |
| 1521 | list_for_each_entry(handler, &iucv_handler_list, list) { |
| 1522 | if (!handler->path_pending) |
| 1523 | continue; |
| 1524 | /* |
| 1525 | * Add path to handler to allow a call to iucv_path_sever |
| 1526 | * inside the path_pending function. If the handler returns |
| 1527 | * an error remove the path from the handler again. |
| 1528 | */ |
| 1529 | list_add(&path->list, &handler->paths); |
| 1530 | path->handler = handler; |
| 1531 | if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) |
| 1532 | return; |
| 1533 | list_del(&path->list); |
| 1534 | path->handler = NULL; |
| 1535 | } |
| 1536 | /* No handler wanted the path. */ |
| 1537 | iucv_path_table[path->pathid] = NULL; |
| 1538 | iucv_path_free(path); |
| 1539 | error = iucv_error_no_listener; |
| 1540 | out_sever: |
| 1541 | iucv_sever_pathid(ipp->ippathid, error); |
| 1542 | } |
| 1543 | |
| 1544 | /** |
| 1545 | * iucv_path_complete |
| 1546 | * @data: Pointer to external interrupt buffer |
| 1547 | * |
| 1548 | * Process connection complete work item. Called from tasklet while holding |
| 1549 | * iucv_table_lock. |
| 1550 | */ |
| 1551 | struct iucv_path_complete { |
| 1552 | u16 ippathid; |
| 1553 | u8 ipflags1; |
| 1554 | u8 iptype; |
| 1555 | u16 ipmsglim; |
| 1556 | u16 res1; |
| 1557 | u8 res2[8]; |
| 1558 | u8 ipuser[16]; |
| 1559 | u32 res3; |
| 1560 | u8 ippollfg; |
| 1561 | u8 res4[3]; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1562 | } __packed; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1563 | |
| 1564 | static void iucv_path_complete(struct iucv_irq_data *data) |
| 1565 | { |
| 1566 | struct iucv_path_complete *ipc = (void *) data; |
| 1567 | struct iucv_path *path = iucv_path_table[ipc->ippathid]; |
| 1568 | |
Hendrik Brueckner | b8942e3 | 2009-04-21 23:26:23 +0000 | [diff] [blame] | 1569 | if (path) |
| 1570 | path->flags = ipc->ipflags1; |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1571 | if (path && path->handler && path->handler->path_complete) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1572 | path->handler->path_complete(path, ipc->ipuser); |
| 1573 | } |
| 1574 | |
| 1575 | /** |
| 1576 | * iucv_path_severed |
| 1577 | * @data: Pointer to external interrupt buffer |
| 1578 | * |
| 1579 | * Process connection severed work item. Called from tasklet while holding |
| 1580 | * iucv_table_lock. |
| 1581 | */ |
| 1582 | struct iucv_path_severed { |
| 1583 | u16 ippathid; |
| 1584 | u8 res1; |
| 1585 | u8 iptype; |
| 1586 | u32 res2; |
| 1587 | u8 res3[8]; |
| 1588 | u8 ipuser[16]; |
| 1589 | u32 res4; |
| 1590 | u8 ippollfg; |
| 1591 | u8 res5[3]; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1592 | } __packed; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1593 | |
| 1594 | static void iucv_path_severed(struct iucv_irq_data *data) |
| 1595 | { |
| 1596 | struct iucv_path_severed *ips = (void *) data; |
| 1597 | struct iucv_path *path = iucv_path_table[ips->ippathid]; |
| 1598 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1599 | if (!path || !path->handler) /* Already severed */ |
| 1600 | return; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1601 | if (path->handler->path_severed) |
| 1602 | path->handler->path_severed(path, ips->ipuser); |
| 1603 | else { |
| 1604 | iucv_sever_pathid(path->pathid, NULL); |
| 1605 | iucv_path_table[path->pathid] = NULL; |
Ursula Braun | 42e1b4c | 2009-04-21 23:26:20 +0000 | [diff] [blame] | 1606 | list_del(&path->list); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1607 | iucv_path_free(path); |
| 1608 | } |
| 1609 | } |
| 1610 | |
| 1611 | /** |
| 1612 | * iucv_path_quiesced |
| 1613 | * @data: Pointer to external interrupt buffer |
| 1614 | * |
| 1615 | * Process connection quiesced work item. Called from tasklet while holding |
| 1616 | * iucv_table_lock. |
| 1617 | */ |
| 1618 | struct iucv_path_quiesced { |
| 1619 | u16 ippathid; |
| 1620 | u8 res1; |
| 1621 | u8 iptype; |
| 1622 | u32 res2; |
| 1623 | u8 res3[8]; |
| 1624 | u8 ipuser[16]; |
| 1625 | u32 res4; |
| 1626 | u8 ippollfg; |
| 1627 | u8 res5[3]; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1628 | } __packed; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1629 | |
| 1630 | static void iucv_path_quiesced(struct iucv_irq_data *data) |
| 1631 | { |
| 1632 | struct iucv_path_quiesced *ipq = (void *) data; |
| 1633 | struct iucv_path *path = iucv_path_table[ipq->ippathid]; |
| 1634 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1635 | if (path && path->handler && path->handler->path_quiesced) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1636 | path->handler->path_quiesced(path, ipq->ipuser); |
| 1637 | } |
| 1638 | |
| 1639 | /** |
| 1640 | * iucv_path_resumed |
| 1641 | * @data: Pointer to external interrupt buffer |
| 1642 | * |
| 1643 | * Process connection resumed work item. Called from tasklet while holding |
| 1644 | * iucv_table_lock. |
| 1645 | */ |
| 1646 | struct iucv_path_resumed { |
| 1647 | u16 ippathid; |
| 1648 | u8 res1; |
| 1649 | u8 iptype; |
| 1650 | u32 res2; |
| 1651 | u8 res3[8]; |
| 1652 | u8 ipuser[16]; |
| 1653 | u32 res4; |
| 1654 | u8 ippollfg; |
| 1655 | u8 res5[3]; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1656 | } __packed; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1657 | |
| 1658 | static void iucv_path_resumed(struct iucv_irq_data *data) |
| 1659 | { |
| 1660 | struct iucv_path_resumed *ipr = (void *) data; |
| 1661 | struct iucv_path *path = iucv_path_table[ipr->ippathid]; |
| 1662 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1663 | if (path && path->handler && path->handler->path_resumed) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1664 | path->handler->path_resumed(path, ipr->ipuser); |
| 1665 | } |
| 1666 | |
| 1667 | /** |
| 1668 | * iucv_message_complete |
| 1669 | * @data: Pointer to external interrupt buffer |
| 1670 | * |
| 1671 | * Process message complete work item. Called from tasklet while holding |
| 1672 | * iucv_table_lock. |
| 1673 | */ |
| 1674 | struct iucv_message_complete { |
| 1675 | u16 ippathid; |
| 1676 | u8 ipflags1; |
| 1677 | u8 iptype; |
| 1678 | u32 ipmsgid; |
| 1679 | u32 ipaudit; |
| 1680 | u8 iprmmsg[8]; |
| 1681 | u32 ipsrccls; |
| 1682 | u32 ipmsgtag; |
| 1683 | u32 res; |
| 1684 | u32 ipbfln2f; |
| 1685 | u8 ippollfg; |
| 1686 | u8 res2[3]; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1687 | } __packed; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1688 | |
| 1689 | static void iucv_message_complete(struct iucv_irq_data *data) |
| 1690 | { |
| 1691 | struct iucv_message_complete *imc = (void *) data; |
| 1692 | struct iucv_path *path = iucv_path_table[imc->ippathid]; |
| 1693 | struct iucv_message msg; |
| 1694 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1695 | if (path && path->handler && path->handler->message_complete) { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1696 | msg.flags = imc->ipflags1; |
| 1697 | msg.id = imc->ipmsgid; |
| 1698 | msg.audit = imc->ipaudit; |
| 1699 | memcpy(msg.rmmsg, imc->iprmmsg, 8); |
| 1700 | msg.class = imc->ipsrccls; |
| 1701 | msg.tag = imc->ipmsgtag; |
| 1702 | msg.length = imc->ipbfln2f; |
| 1703 | path->handler->message_complete(path, &msg); |
| 1704 | } |
| 1705 | } |
| 1706 | |
| 1707 | /** |
| 1708 | * iucv_message_pending |
| 1709 | * @data: Pointer to external interrupt buffer |
| 1710 | * |
| 1711 | * Process message pending work item. Called from tasklet while holding |
| 1712 | * iucv_table_lock. |
| 1713 | */ |
| 1714 | struct iucv_message_pending { |
| 1715 | u16 ippathid; |
| 1716 | u8 ipflags1; |
| 1717 | u8 iptype; |
| 1718 | u32 ipmsgid; |
| 1719 | u32 iptrgcls; |
| 1720 | union { |
| 1721 | u32 iprmmsg1_u32; |
| 1722 | u8 iprmmsg1[4]; |
| 1723 | } ln1msg1; |
| 1724 | union { |
| 1725 | u32 ipbfln1f; |
| 1726 | u8 iprmmsg2[4]; |
| 1727 | } ln1msg2; |
| 1728 | u32 res1[3]; |
| 1729 | u32 ipbfln2f; |
| 1730 | u8 ippollfg; |
| 1731 | u8 res2[3]; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1732 | } __packed; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1733 | |
| 1734 | static void iucv_message_pending(struct iucv_irq_data *data) |
| 1735 | { |
| 1736 | struct iucv_message_pending *imp = (void *) data; |
| 1737 | struct iucv_path *path = iucv_path_table[imp->ippathid]; |
| 1738 | struct iucv_message msg; |
| 1739 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1740 | if (path && path->handler && path->handler->message_pending) { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1741 | msg.flags = imp->ipflags1; |
| 1742 | msg.id = imp->ipmsgid; |
| 1743 | msg.class = imp->iptrgcls; |
| 1744 | if (imp->ipflags1 & IUCV_IPRMDATA) { |
| 1745 | memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8); |
| 1746 | msg.length = 8; |
| 1747 | } else |
| 1748 | msg.length = imp->ln1msg2.ipbfln1f; |
| 1749 | msg.reply_size = imp->ipbfln2f; |
| 1750 | path->handler->message_pending(path, &msg); |
| 1751 | } |
| 1752 | } |
| 1753 | |
| 1754 | /** |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1755 | * iucv_tasklet_fn: |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1756 | * |
| 1757 | * This tasklet loops over the queue of irq buffers created by |
| 1758 | * iucv_external_interrupt, calls the appropriate action handler |
| 1759 | * and then frees the buffer. |
| 1760 | */ |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1761 | static void iucv_tasklet_fn(unsigned long ignored) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1762 | { |
| 1763 | typedef void iucv_irq_fn(struct iucv_irq_data *); |
| 1764 | static iucv_irq_fn *irq_fn[] = { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1765 | [0x02] = iucv_path_complete, |
| 1766 | [0x03] = iucv_path_severed, |
| 1767 | [0x04] = iucv_path_quiesced, |
| 1768 | [0x05] = iucv_path_resumed, |
| 1769 | [0x06] = iucv_message_complete, |
| 1770 | [0x07] = iucv_message_complete, |
| 1771 | [0x08] = iucv_message_pending, |
| 1772 | [0x09] = iucv_message_pending, |
| 1773 | }; |
Denis Cheng | b5e7833 | 2007-12-07 00:51:45 -0800 | [diff] [blame] | 1774 | LIST_HEAD(task_queue); |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1775 | struct iucv_irq_list *p, *n; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1776 | |
| 1777 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ |
Ursula Braun | 13fdc9a | 2007-07-14 19:03:41 -0700 | [diff] [blame] | 1778 | if (!spin_trylock(&iucv_table_lock)) { |
| 1779 | tasklet_schedule(&iucv_tasklet); |
| 1780 | return; |
| 1781 | } |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1782 | iucv_active_cpu = smp_processor_id(); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1783 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1784 | spin_lock_irq(&iucv_queue_lock); |
| 1785 | list_splice_init(&iucv_task_queue, &task_queue); |
| 1786 | spin_unlock_irq(&iucv_queue_lock); |
| 1787 | |
| 1788 | list_for_each_entry_safe(p, n, &task_queue, list) { |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1789 | list_del_init(&p->list); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1790 | irq_fn[p->data.iptype](&p->data); |
| 1791 | kfree(p); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1792 | } |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1793 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1794 | iucv_active_cpu = -1; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1795 | spin_unlock(&iucv_table_lock); |
| 1796 | } |
| 1797 | |
| 1798 | /** |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1799 | * iucv_work_fn: |
| 1800 | * |
| 1801 | * This work function loops over the queue of path pending irq blocks |
| 1802 | * created by iucv_external_interrupt, calls the appropriate action |
| 1803 | * handler and then frees the buffer. |
| 1804 | */ |
| 1805 | static void iucv_work_fn(struct work_struct *work) |
| 1806 | { |
Denis Cheng | b5e7833 | 2007-12-07 00:51:45 -0800 | [diff] [blame] | 1807 | LIST_HEAD(work_queue); |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1808 | struct iucv_irq_list *p, *n; |
| 1809 | |
| 1810 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ |
| 1811 | spin_lock_bh(&iucv_table_lock); |
| 1812 | iucv_active_cpu = smp_processor_id(); |
| 1813 | |
| 1814 | spin_lock_irq(&iucv_queue_lock); |
| 1815 | list_splice_init(&iucv_work_queue, &work_queue); |
| 1816 | spin_unlock_irq(&iucv_queue_lock); |
| 1817 | |
| 1818 | iucv_cleanup_queue(); |
| 1819 | list_for_each_entry_safe(p, n, &work_queue, list) { |
| 1820 | list_del_init(&p->list); |
| 1821 | iucv_path_pending(&p->data); |
| 1822 | kfree(p); |
| 1823 | } |
| 1824 | |
| 1825 | iucv_active_cpu = -1; |
| 1826 | spin_unlock_bh(&iucv_table_lock); |
| 1827 | } |
| 1828 | |
| 1829 | /** |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1830 | * iucv_external_interrupt |
| 1831 | * @code: irq code |
| 1832 | * |
| 1833 | * Handles external interrupts coming in from CP. |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1834 | * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1835 | */ |
Heiko Carstens | fde15c3 | 2012-03-11 11:59:31 -0400 | [diff] [blame] | 1836 | static void iucv_external_interrupt(struct ext_code ext_code, |
Martin Schwidefsky | f6649a7 | 2010-10-25 16:10:38 +0200 | [diff] [blame] | 1837 | unsigned int param32, unsigned long param64) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1838 | { |
| 1839 | struct iucv_irq_data *p; |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1840 | struct iucv_irq_list *work; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1841 | |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 1842 | inc_irq_stat(IRQEXT_IUC); |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 1843 | p = iucv_irq_data[smp_processor_id()]; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1844 | if (p->ippathid >= iucv_max_pathid) { |
Ursula Braun | c2b4afd | 2008-07-14 09:59:29 +0200 | [diff] [blame] | 1845 | WARN_ON(p->ippathid >= iucv_max_pathid); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1846 | iucv_sever_pathid(p->ippathid, iucv_error_no_listener); |
| 1847 | return; |
| 1848 | } |
Ursula Braun | c2b4afd | 2008-07-14 09:59:29 +0200 | [diff] [blame] | 1849 | BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1850 | work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1851 | if (!work) { |
Joe Perches | 47c4cfc | 2014-09-09 21:17:31 -0700 | [diff] [blame] | 1852 | pr_warn("iucv_external_interrupt: out of memory\n"); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1853 | return; |
| 1854 | } |
| 1855 | memcpy(&work->data, p, sizeof(work->data)); |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 1856 | spin_lock(&iucv_queue_lock); |
| 1857 | if (p->iptype == 0x01) { |
| 1858 | /* Path pending interrupt. */ |
| 1859 | list_add_tail(&work->list, &iucv_work_queue); |
| 1860 | schedule_work(&iucv_work); |
| 1861 | } else { |
| 1862 | /* The other interrupts. */ |
| 1863 | list_add_tail(&work->list, &iucv_task_queue); |
| 1864 | tasklet_schedule(&iucv_tasklet); |
| 1865 | } |
| 1866 | spin_unlock(&iucv_queue_lock); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 1867 | } |
| 1868 | |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 1869 | static int iucv_pm_prepare(struct device *dev) |
| 1870 | { |
| 1871 | int rc = 0; |
| 1872 | |
| 1873 | #ifdef CONFIG_PM_DEBUG |
| 1874 | printk(KERN_INFO "iucv_pm_prepare\n"); |
| 1875 | #endif |
| 1876 | if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) |
| 1877 | rc = dev->driver->pm->prepare(dev); |
| 1878 | return rc; |
| 1879 | } |
| 1880 | |
| 1881 | static void iucv_pm_complete(struct device *dev) |
| 1882 | { |
| 1883 | #ifdef CONFIG_PM_DEBUG |
| 1884 | printk(KERN_INFO "iucv_pm_complete\n"); |
| 1885 | #endif |
| 1886 | if (dev->driver && dev->driver->pm && dev->driver->pm->complete) |
| 1887 | dev->driver->pm->complete(dev); |
| 1888 | } |
| 1889 | |
| 1890 | /** |
| 1891 | * iucv_path_table_empty() - determine if iucv path table is empty |
| 1892 | * |
| 1893 | * Returns 0 if there are still iucv pathes defined |
| 1894 | * 1 if there are no iucv pathes defined |
| 1895 | */ |
| 1896 | int iucv_path_table_empty(void) |
| 1897 | { |
| 1898 | int i; |
| 1899 | |
| 1900 | for (i = 0; i < iucv_max_pathid; i++) { |
| 1901 | if (iucv_path_table[i]) |
| 1902 | return 0; |
| 1903 | } |
| 1904 | return 1; |
| 1905 | } |
| 1906 | |
| 1907 | /** |
| 1908 | * iucv_pm_freeze() - Freeze PM callback |
| 1909 | * @dev: iucv-based device |
| 1910 | * |
| 1911 | * disable iucv interrupts |
| 1912 | * invoke callback function of the iucv-based driver |
| 1913 | * shut down iucv, if no iucv-pathes are established anymore |
| 1914 | */ |
| 1915 | static int iucv_pm_freeze(struct device *dev) |
| 1916 | { |
| 1917 | int cpu; |
Ursula Braun | b7c2aec | 2009-11-12 21:46:27 +0000 | [diff] [blame] | 1918 | struct iucv_irq_list *p, *n; |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 1919 | int rc = 0; |
| 1920 | |
| 1921 | #ifdef CONFIG_PM_DEBUG |
| 1922 | printk(KERN_WARNING "iucv_pm_freeze\n"); |
| 1923 | #endif |
Ursula Braun | b7c2aec | 2009-11-12 21:46:27 +0000 | [diff] [blame] | 1924 | if (iucv_pm_state != IUCV_PM_FREEZING) { |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1925 | for_each_cpu(cpu, &iucv_irq_cpumask) |
Ursula Braun | b7c2aec | 2009-11-12 21:46:27 +0000 | [diff] [blame] | 1926 | smp_call_function_single(cpu, iucv_block_cpu_almost, |
| 1927 | NULL, 1); |
| 1928 | cancel_work_sync(&iucv_work); |
| 1929 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) { |
| 1930 | list_del_init(&p->list); |
| 1931 | iucv_sever_pathid(p->data.ippathid, |
| 1932 | iucv_error_no_listener); |
| 1933 | kfree(p); |
| 1934 | } |
| 1935 | } |
Ursula Braun | 4c89d86 | 2009-09-16 04:37:22 +0000 | [diff] [blame] | 1936 | iucv_pm_state = IUCV_PM_FREEZING; |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 1937 | if (dev->driver && dev->driver->pm && dev->driver->pm->freeze) |
| 1938 | rc = dev->driver->pm->freeze(dev); |
| 1939 | if (iucv_path_table_empty()) |
| 1940 | iucv_disable(); |
| 1941 | return rc; |
| 1942 | } |
| 1943 | |
| 1944 | /** |
| 1945 | * iucv_pm_thaw() - Thaw PM callback |
| 1946 | * @dev: iucv-based device |
| 1947 | * |
| 1948 | * make iucv ready for use again: allocate path table, declare interrupt buffers |
| 1949 | * and enable iucv interrupts |
| 1950 | * invoke callback function of the iucv-based driver |
| 1951 | */ |
| 1952 | static int iucv_pm_thaw(struct device *dev) |
| 1953 | { |
| 1954 | int rc = 0; |
| 1955 | |
| 1956 | #ifdef CONFIG_PM_DEBUG |
| 1957 | printk(KERN_WARNING "iucv_pm_thaw\n"); |
| 1958 | #endif |
Ursula Braun | 4c89d86 | 2009-09-16 04:37:22 +0000 | [diff] [blame] | 1959 | iucv_pm_state = IUCV_PM_THAWING; |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 1960 | if (!iucv_path_table) { |
| 1961 | rc = iucv_enable(); |
| 1962 | if (rc) |
| 1963 | goto out; |
| 1964 | } |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1965 | if (cpumask_empty(&iucv_irq_cpumask)) { |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 1966 | if (iucv_nonsmp_handler) |
| 1967 | /* enable interrupts on one cpu */ |
| 1968 | iucv_allow_cpu(NULL); |
| 1969 | else |
| 1970 | /* enable interrupts on all cpus */ |
| 1971 | iucv_setmask_mp(); |
| 1972 | } |
| 1973 | if (dev->driver && dev->driver->pm && dev->driver->pm->thaw) |
| 1974 | rc = dev->driver->pm->thaw(dev); |
| 1975 | out: |
| 1976 | return rc; |
| 1977 | } |
| 1978 | |
| 1979 | /** |
| 1980 | * iucv_pm_restore() - Restore PM callback |
| 1981 | * @dev: iucv-based device |
| 1982 | * |
| 1983 | * make iucv ready for use again: allocate path table, declare interrupt buffers |
| 1984 | * and enable iucv interrupts |
| 1985 | * invoke callback function of the iucv-based driver |
| 1986 | */ |
| 1987 | static int iucv_pm_restore(struct device *dev) |
| 1988 | { |
| 1989 | int rc = 0; |
| 1990 | |
| 1991 | #ifdef CONFIG_PM_DEBUG |
| 1992 | printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table); |
| 1993 | #endif |
Ursula Braun | 4c89d86 | 2009-09-16 04:37:22 +0000 | [diff] [blame] | 1994 | if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table) |
Joe Perches | 47c4cfc | 2014-09-09 21:17:31 -0700 | [diff] [blame] | 1995 | pr_warn("Suspending Linux did not completely close all IUCV connections\n"); |
Ursula Braun | 4c89d86 | 2009-09-16 04:37:22 +0000 | [diff] [blame] | 1996 | iucv_pm_state = IUCV_PM_RESTORING; |
KOSAKI Motohiro | f201903 | 2011-05-12 18:45:09 +0000 | [diff] [blame] | 1997 | if (cpumask_empty(&iucv_irq_cpumask)) { |
Ursula Braun | 672e405 | 2009-06-16 10:30:42 +0200 | [diff] [blame] | 1998 | rc = iucv_query_maxconn(); |
| 1999 | rc = iucv_enable(); |
| 2000 | if (rc) |
| 2001 | goto out; |
| 2002 | } |
| 2003 | if (dev->driver && dev->driver->pm && dev->driver->pm->restore) |
| 2004 | rc = dev->driver->pm->restore(dev); |
| 2005 | out: |
| 2006 | return rc; |
| 2007 | } |
| 2008 | |
Frank Blaschka | 96d042a | 2011-08-08 01:33:49 +0000 | [diff] [blame] | 2009 | struct iucv_interface iucv_if = { |
| 2010 | .message_receive = iucv_message_receive, |
| 2011 | .__message_receive = __iucv_message_receive, |
| 2012 | .message_reply = iucv_message_reply, |
| 2013 | .message_reject = iucv_message_reject, |
| 2014 | .message_send = iucv_message_send, |
| 2015 | .__message_send = __iucv_message_send, |
| 2016 | .message_send2way = iucv_message_send2way, |
| 2017 | .message_purge = iucv_message_purge, |
| 2018 | .path_accept = iucv_path_accept, |
| 2019 | .path_connect = iucv_path_connect, |
| 2020 | .path_quiesce = iucv_path_quiesce, |
| 2021 | .path_resume = iucv_path_resume, |
| 2022 | .path_sever = iucv_path_sever, |
| 2023 | .iucv_register = iucv_register, |
| 2024 | .iucv_unregister = iucv_unregister, |
| 2025 | .bus = NULL, |
| 2026 | .root = NULL, |
| 2027 | }; |
| 2028 | EXPORT_SYMBOL(iucv_if); |
| 2029 | |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2030 | /** |
| 2031 | * iucv_init |
| 2032 | * |
| 2033 | * Allocates and initializes various data structures. |
| 2034 | */ |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 2035 | static int __init iucv_init(void) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2036 | { |
| 2037 | int rc; |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 2038 | int cpu; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2039 | |
| 2040 | if (!MACHINE_IS_VM) { |
| 2041 | rc = -EPROTONOSUPPORT; |
| 2042 | goto out; |
| 2043 | } |
Martin Schwidefsky | 5beab99 | 2011-07-24 10:48:28 +0200 | [diff] [blame] | 2044 | ctl_set_bit(0, 1); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2045 | rc = iucv_query_maxconn(); |
| 2046 | if (rc) |
Martin Schwidefsky | 5beab99 | 2011-07-24 10:48:28 +0200 | [diff] [blame] | 2047 | goto out_ctl; |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 2048 | rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2049 | if (rc) |
Martin Schwidefsky | 5beab99 | 2011-07-24 10:48:28 +0200 | [diff] [blame] | 2050 | goto out_ctl; |
Mark McLoughlin | 035da16 | 2008-12-15 12:58:29 +0000 | [diff] [blame] | 2051 | iucv_root = root_device_register("iucv"); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2052 | if (IS_ERR(iucv_root)) { |
| 2053 | rc = PTR_ERR(iucv_root); |
Cornelia Huck | 2d7bf36 | 2008-04-10 02:12:45 -0700 | [diff] [blame] | 2054 | goto out_int; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2055 | } |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 2056 | |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 2057 | cpu_notifier_register_begin(); |
| 2058 | |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 2059 | for_each_online_cpu(cpu) { |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 2060 | if (alloc_iucv_data(cpu)) { |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 2061 | rc = -ENOMEM; |
| 2062 | goto out_free; |
| 2063 | } |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2064 | } |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 2065 | rc = __register_hotcpu_notifier(&iucv_cpu_notifier); |
Cornelia Huck | 2d7bf36 | 2008-04-10 02:12:45 -0700 | [diff] [blame] | 2066 | if (rc) |
| 2067 | goto out_free; |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 2068 | |
| 2069 | cpu_notifier_register_done(); |
| 2070 | |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 2071 | rc = register_reboot_notifier(&iucv_reboot_notifier); |
| 2072 | if (rc) |
| 2073 | goto out_cpu; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2074 | ASCEBC(iucv_error_no_listener, 16); |
| 2075 | ASCEBC(iucv_error_no_memory, 16); |
| 2076 | ASCEBC(iucv_error_pathid, 16); |
| 2077 | iucv_available = 1; |
Cornelia Huck | 2d7bf36 | 2008-04-10 02:12:45 -0700 | [diff] [blame] | 2078 | rc = bus_register(&iucv_bus); |
| 2079 | if (rc) |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 2080 | goto out_reboot; |
Frank Blaschka | 96d042a | 2011-08-08 01:33:49 +0000 | [diff] [blame] | 2081 | iucv_if.root = iucv_root; |
| 2082 | iucv_if.bus = &iucv_bus; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2083 | return 0; |
| 2084 | |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 2085 | out_reboot: |
| 2086 | unregister_reboot_notifier(&iucv_reboot_notifier); |
Cornelia Huck | 2d7bf36 | 2008-04-10 02:12:45 -0700 | [diff] [blame] | 2087 | out_cpu: |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 2088 | cpu_notifier_register_begin(); |
| 2089 | __unregister_hotcpu_notifier(&iucv_cpu_notifier); |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 2090 | out_free: |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 2091 | for_each_possible_cpu(cpu) |
| 2092 | free_iucv_data(cpu); |
| 2093 | |
| 2094 | cpu_notifier_register_done(); |
| 2095 | |
Mark McLoughlin | 035da16 | 2008-12-15 12:58:29 +0000 | [diff] [blame] | 2096 | root_device_unregister(iucv_root); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2097 | out_int: |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 2098 | unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); |
Martin Schwidefsky | 5beab99 | 2011-07-24 10:48:28 +0200 | [diff] [blame] | 2099 | out_ctl: |
| 2100 | ctl_clear_bit(0, 1); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2101 | out: |
| 2102 | return rc; |
| 2103 | } |
| 2104 | |
| 2105 | /** |
| 2106 | * iucv_exit |
| 2107 | * |
| 2108 | * Frees everything allocated from iucv_init. |
| 2109 | */ |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 2110 | static void __exit iucv_exit(void) |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2111 | { |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 2112 | struct iucv_irq_list *p, *n; |
Christoph Lameter | 70cf5035 | 2007-11-20 11:13:38 +0100 | [diff] [blame] | 2113 | int cpu; |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2114 | |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 2115 | spin_lock_irq(&iucv_queue_lock); |
| 2116 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) |
| 2117 | kfree(p); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2118 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) |
| 2119 | kfree(p); |
Martin Schwidefsky | 04b090d | 2007-04-28 23:03:59 -0700 | [diff] [blame] | 2120 | spin_unlock_irq(&iucv_queue_lock); |
Ursula Braun | 6c00596 | 2009-06-16 10:30:41 +0200 | [diff] [blame] | 2121 | unregister_reboot_notifier(&iucv_reboot_notifier); |
Srivatsa S. Bhat | a0e247a | 2014-03-11 02:12:57 +0530 | [diff] [blame] | 2122 | cpu_notifier_register_begin(); |
| 2123 | __unregister_hotcpu_notifier(&iucv_cpu_notifier); |
| 2124 | for_each_possible_cpu(cpu) |
| 2125 | free_iucv_data(cpu); |
| 2126 | cpu_notifier_register_done(); |
Mark McLoughlin | 035da16 | 2008-12-15 12:58:29 +0000 | [diff] [blame] | 2127 | root_device_unregister(iucv_root); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2128 | bus_unregister(&iucv_bus); |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 2129 | unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2130 | } |
| 2131 | |
| 2132 | subsys_initcall(iucv_init); |
| 2133 | module_exit(iucv_exit); |
| 2134 | |
Martin Schwidefsky | 2356f4c | 2007-02-08 13:37:42 -0800 | [diff] [blame] | 2135 | MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
| 2136 | MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); |
| 2137 | MODULE_LICENSE("GPL"); |