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Diffstat (limited to 'net/iucv/iucv.c')
| -rw-r--r-- | net/iucv/iucv.c | 1908 |
1 files changed, 1908 insertions, 0 deletions
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c new file mode 100644 index 000000000..fc3fddeb6 --- /dev/null +++ b/net/iucv/iucv.c @@ -0,0 +1,1908 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * IUCV base infrastructure. + * + * Copyright IBM Corp. 2001, 2009 + * + * Author(s): + * Original source: + * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000 + * Xenia Tkatschow (xenia@us.ibm.com) + * 2Gb awareness and general cleanup: + * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) + * Rewritten for af_iucv: + * Martin Schwidefsky <schwidefsky@de.ibm.com> + * PM functions: + * Ursula Braun (ursula.braun@de.ibm.com) + * + * Documentation used: + * The original source + * CP Programming Service, IBM document # SC24-5760 + */ + +#define KMSG_COMPONENT "iucv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/kernel_stat.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/spinlock.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/device.h> +#include <linux/cpu.h> +#include <linux/reboot.h> +#include <net/iucv/iucv.h> +#include <linux/atomic.h> +#include <asm/ebcdic.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/smp.h> + +/* + * FLAGS: + * All flags are defined in the field IPFLAGS1 of each function + * and can be found in CP Programming Services. + * IPSRCCLS - Indicates you have specified a source class. + * IPTRGCLS - Indicates you have specified a target class. + * IPFGPID - Indicates you have specified a pathid. + * IPFGMID - Indicates you have specified a message ID. + * IPNORPY - Indicates a one-way message. No reply expected. + * IPALL - Indicates that all paths are affected. + */ +#define IUCV_IPSRCCLS 0x01 +#define IUCV_IPTRGCLS 0x01 +#define IUCV_IPFGPID 0x02 +#define IUCV_IPFGMID 0x04 +#define IUCV_IPNORPY 0x10 +#define IUCV_IPALL 0x80 + +static int iucv_bus_match(struct device *dev, struct device_driver *drv) +{ + return 0; +} + +struct bus_type iucv_bus = { + .name = "iucv", + .match = iucv_bus_match, +}; +EXPORT_SYMBOL(iucv_bus); + +struct device *iucv_root; +EXPORT_SYMBOL(iucv_root); + +static int iucv_available; + +/* General IUCV interrupt structure */ +struct iucv_irq_data { + u16 ippathid; + u8 ipflags1; + u8 iptype; + u32 res2[9]; +}; + +struct iucv_irq_list { + struct list_head list; + struct iucv_irq_data data; +}; + +static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; +static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE }; +static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE }; + +/* + * Queue of interrupt buffers lock for delivery via the tasklet + * (fast but can't call smp_call_function). + */ +static LIST_HEAD(iucv_task_queue); + +/* + * The tasklet for fast delivery of iucv interrupts. + */ +static void iucv_tasklet_fn(unsigned long); +static DECLARE_TASKLET_OLD(iucv_tasklet, iucv_tasklet_fn); + +/* + * Queue of interrupt buffers for delivery via a work queue + * (slower but can call smp_call_function). + */ +static LIST_HEAD(iucv_work_queue); + +/* + * The work element to deliver path pending interrupts. + */ +static void iucv_work_fn(struct work_struct *work); +static DECLARE_WORK(iucv_work, iucv_work_fn); + +/* + * Spinlock protecting task and work queue. + */ +static DEFINE_SPINLOCK(iucv_queue_lock); + +enum iucv_command_codes { + IUCV_QUERY = 0, + IUCV_RETRIEVE_BUFFER = 2, + IUCV_SEND = 4, + IUCV_RECEIVE = 5, + IUCV_REPLY = 6, + IUCV_REJECT = 8, + IUCV_PURGE = 9, + IUCV_ACCEPT = 10, + IUCV_CONNECT = 11, + IUCV_DECLARE_BUFFER = 12, + IUCV_QUIESCE = 13, + IUCV_RESUME = 14, + IUCV_SEVER = 15, + IUCV_SETMASK = 16, + IUCV_SETCONTROLMASK = 17, +}; + +/* + * Error messages that are used with the iucv_sever function. They get + * converted to EBCDIC. + */ +static char iucv_error_no_listener[16] = "NO LISTENER"; +static char iucv_error_no_memory[16] = "NO MEMORY"; +static char iucv_error_pathid[16] = "INVALID PATHID"; + +/* + * iucv_handler_list: List of registered handlers. + */ +static LIST_HEAD(iucv_handler_list); + +/* + * iucv_path_table: an array of iucv_path structures. + */ +static struct iucv_path **iucv_path_table; +static unsigned long iucv_max_pathid; + +/* + * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table + */ +static DEFINE_SPINLOCK(iucv_table_lock); + +/* + * iucv_active_cpu: contains the number of the cpu executing the tasklet + * or the work handler. Needed for iucv_path_sever called from tasklet. + */ +static int iucv_active_cpu = -1; + +/* + * Mutex and wait queue for iucv_register/iucv_unregister. + */ +static DEFINE_MUTEX(iucv_register_mutex); + +/* + * Counter for number of non-smp capable handlers. + */ +static int iucv_nonsmp_handler; + +/* + * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, + * iucv_path_quiesce and iucv_path_sever. + */ +struct iucv_cmd_control { + u16 ippathid; + u8 ipflags1; + u8 iprcode; + u16 ipmsglim; + u16 res1; + u8 ipvmid[8]; + u8 ipuser[16]; + u8 iptarget[8]; +} __attribute__ ((packed,aligned(8))); + +/* + * Data in parameter list iucv structure. Used by iucv_message_send, + * iucv_message_send2way and iucv_message_reply. + */ +struct iucv_cmd_dpl { + u16 ippathid; + u8 ipflags1; + u8 iprcode; + u32 ipmsgid; + u32 iptrgcls; + u8 iprmmsg[8]; + u32 ipsrccls; + u32 ipmsgtag; + u32 ipbfadr2; + u32 ipbfln2f; + u32 res; +} __attribute__ ((packed,aligned(8))); + +/* + * Data in buffer iucv structure. Used by iucv_message_receive, + * iucv_message_reject, iucv_message_send, iucv_message_send2way + * and iucv_declare_cpu. + */ +struct iucv_cmd_db { + u16 ippathid; + u8 ipflags1; + u8 iprcode; + u32 ipmsgid; + u32 iptrgcls; + u32 ipbfadr1; + u32 ipbfln1f; + u32 ipsrccls; + u32 ipmsgtag; + u32 ipbfadr2; + u32 ipbfln2f; + u32 res; +} __attribute__ ((packed,aligned(8))); + +/* + * Purge message iucv structure. Used by iucv_message_purge. + */ +struct iucv_cmd_purge { + u16 ippathid; + u8 ipflags1; + u8 iprcode; + u32 ipmsgid; + u8 ipaudit[3]; + u8 res1[5]; + u32 res2; + u32 ipsrccls; + u32 ipmsgtag; + u32 res3[3]; +} __attribute__ ((packed,aligned(8))); + +/* + * Set mask iucv structure. Used by iucv_enable_cpu. + */ +struct iucv_cmd_set_mask { + u8 ipmask; + u8 res1[2]; + u8 iprcode; + u32 res2[9]; +} __attribute__ ((packed,aligned(8))); + +union iucv_param { + struct iucv_cmd_control ctrl; + struct iucv_cmd_dpl dpl; + struct iucv_cmd_db db; + struct iucv_cmd_purge purge; + struct iucv_cmd_set_mask set_mask; +}; + +/* + * Anchor for per-cpu IUCV command parameter block. + */ +static union iucv_param *iucv_param[NR_CPUS]; +static union iucv_param *iucv_param_irq[NR_CPUS]; + +/** + * __iucv_call_b2f0 + * @command: identifier of IUCV call to CP. + * @parm: pointer to a struct iucv_parm block + * + * Calls CP to execute IUCV commands. + * + * Returns the result of the CP IUCV call. + */ +static inline int __iucv_call_b2f0(int command, union iucv_param *parm) +{ + int cc; + + asm volatile( + " lgr 0,%[reg0]\n" + " lgr 1,%[reg1]\n" + " .long 0xb2f01000\n" + " ipm %[cc]\n" + " srl %[cc],28\n" + : [cc] "=&d" (cc), "+m" (*parm) + : [reg0] "d" ((unsigned long)command), + [reg1] "d" ((unsigned long)parm) + : "cc", "0", "1"); + return cc; +} + +static inline int iucv_call_b2f0(int command, union iucv_param *parm) +{ + int ccode; + + ccode = __iucv_call_b2f0(command, parm); + return ccode == 1 ? parm->ctrl.iprcode : ccode; +} + +/* + * iucv_query_maxconn + * + * Determines the maximum number of connections that may be established. + * + * Returns the maximum number of connections or -EPERM is IUCV is not + * available. + */ +static int __iucv_query_maxconn(void *param, unsigned long *max_pathid) +{ + unsigned long reg1 = virt_to_phys(param); + int cc; + + asm volatile ( + " lghi 0,%[cmd]\n" + " lgr 1,%[reg1]\n" + " .long 0xb2f01000\n" + " ipm %[cc]\n" + " srl %[cc],28\n" + " lgr %[reg1],1\n" + : [cc] "=&d" (cc), [reg1] "+&d" (reg1) + : [cmd] "K" (IUCV_QUERY) + : "cc", "0", "1"); + *max_pathid = reg1; + return cc; +} + +static int iucv_query_maxconn(void) +{ + unsigned long max_pathid; + void *param; + int ccode; + + param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA); + if (!param) + return -ENOMEM; + ccode = __iucv_query_maxconn(param, &max_pathid); + if (ccode == 0) + iucv_max_pathid = max_pathid; + kfree(param); + return ccode ? -EPERM : 0; +} + +/** + * iucv_allow_cpu + * @data: unused + * + * Allow iucv interrupts on this cpu. + */ +static void iucv_allow_cpu(void *data) +{ + int cpu = smp_processor_id(); + union iucv_param *parm; + + /* + * Enable all iucv interrupts. + * ipmask contains bits for the different interrupts + * 0x80 - Flag to allow nonpriority message pending interrupts + * 0x40 - Flag to allow priority message pending interrupts + * 0x20 - Flag to allow nonpriority message completion interrupts + * 0x10 - Flag to allow priority message completion interrupts + * 0x08 - Flag to allow IUCV control interrupts + */ + parm = iucv_param_irq[cpu]; + memset(parm, 0, sizeof(union iucv_param)); + parm->set_mask.ipmask = 0xf8; + iucv_call_b2f0(IUCV_SETMASK, parm); + + /* + * Enable all iucv control interrupts. + * ipmask contains bits for the different interrupts + * 0x80 - Flag to allow pending connections interrupts + * 0x40 - Flag to allow connection complete interrupts + * 0x20 - Flag to allow connection severed interrupts + * 0x10 - Flag to allow connection quiesced interrupts + * 0x08 - Flag to allow connection resumed interrupts + */ + memset(parm, 0, sizeof(union iucv_param)); + parm->set_mask.ipmask = 0xf8; + iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); + /* Set indication that iucv interrupts are allowed for this cpu. */ + cpumask_set_cpu(cpu, &iucv_irq_cpumask); +} + +/** + * iucv_block_cpu + * @data: unused + * + * Block iucv interrupts on this cpu. + */ +static void iucv_block_cpu(void *data) +{ + int cpu = smp_processor_id(); + union iucv_param *parm; + + /* Disable all iucv interrupts. */ + parm = iucv_param_irq[cpu]; + memset(parm, 0, sizeof(union iucv_param)); + iucv_call_b2f0(IUCV_SETMASK, parm); + + /* Clear indication that iucv interrupts are allowed for this cpu. */ + cpumask_clear_cpu(cpu, &iucv_irq_cpumask); +} + +/** + * iucv_declare_cpu + * @data: unused + * + * Declare a interrupt buffer on this cpu. + */ +static void iucv_declare_cpu(void *data) +{ + int cpu = smp_processor_id(); + union iucv_param *parm; + int rc; + + if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) + return; + + /* Declare interrupt buffer. */ + parm = iucv_param_irq[cpu]; + memset(parm, 0, sizeof(union iucv_param)); + parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); + rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); + if (rc) { + char *err = "Unknown"; + switch (rc) { + case 0x03: + err = "Directory error"; + break; + case 0x0a: + err = "Invalid length"; + break; + case 0x13: + err = "Buffer already exists"; + break; + case 0x3e: + err = "Buffer overlap"; + break; + case 0x5c: + err = "Paging or storage error"; + break; + } + pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n", + cpu, rc, err); + return; + } + + /* Set indication that an iucv buffer exists for this cpu. */ + cpumask_set_cpu(cpu, &iucv_buffer_cpumask); + + if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask)) + /* Enable iucv interrupts on this cpu. */ + iucv_allow_cpu(NULL); + else + /* Disable iucv interrupts on this cpu. */ + iucv_block_cpu(NULL); +} + +/** + * iucv_retrieve_cpu + * @data: unused + * + * Retrieve interrupt buffer on this cpu. + */ +static void iucv_retrieve_cpu(void *data) +{ + int cpu = smp_processor_id(); + union iucv_param *parm; + + if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) + return; + + /* Block iucv interrupts. */ + iucv_block_cpu(NULL); + + /* Retrieve interrupt buffer. */ + parm = iucv_param_irq[cpu]; + iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); + + /* Clear indication that an iucv buffer exists for this cpu. */ + cpumask_clear_cpu(cpu, &iucv_buffer_cpumask); +} + +/* + * iucv_setmask_mp + * + * Allow iucv interrupts on all cpus. + */ +static void iucv_setmask_mp(void) +{ + int cpu; + + cpus_read_lock(); + for_each_online_cpu(cpu) + /* Enable all cpus with a declared buffer. */ + if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) && + !cpumask_test_cpu(cpu, &iucv_irq_cpumask)) + smp_call_function_single(cpu, iucv_allow_cpu, + NULL, 1); + cpus_read_unlock(); +} + +/* + * iucv_setmask_up + * + * Allow iucv interrupts on a single cpu. + */ +static void iucv_setmask_up(void) +{ + cpumask_t cpumask; + int cpu; + + /* Disable all cpu but the first in cpu_irq_cpumask. */ + cpumask_copy(&cpumask, &iucv_irq_cpumask); + cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask); + for_each_cpu(cpu, &cpumask) + smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); +} + +/* + * iucv_enable + * + * This function makes iucv ready for use. It allocates the pathid + * table, declares an iucv interrupt buffer and enables the iucv + * interrupts. Called when the first user has registered an iucv + * handler. + */ +static int iucv_enable(void) +{ + size_t alloc_size; + int cpu, rc; + + cpus_read_lock(); + rc = -ENOMEM; + alloc_size = iucv_max_pathid * sizeof(struct iucv_path); + iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); + if (!iucv_path_table) + goto out; + /* Declare per cpu buffers. */ + rc = -EIO; + for_each_online_cpu(cpu) + smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); + if (cpumask_empty(&iucv_buffer_cpumask)) + /* No cpu could declare an iucv buffer. */ + goto out; + cpus_read_unlock(); + return 0; +out: + kfree(iucv_path_table); + iucv_path_table = NULL; + cpus_read_unlock(); + return rc; +} + +/* + * iucv_disable + * + * This function shuts down iucv. It disables iucv interrupts, retrieves + * the iucv interrupt buffer and frees the pathid table. Called after the + * last user unregister its iucv handler. + */ +static void iucv_disable(void) +{ + cpus_read_lock(); + on_each_cpu(iucv_retrieve_cpu, NULL, 1); + kfree(iucv_path_table); + iucv_path_table = NULL; + cpus_read_unlock(); +} + +static int iucv_cpu_dead(unsigned int cpu) +{ + kfree(iucv_param_irq[cpu]); + iucv_param_irq[cpu] = NULL; + kfree(iucv_param[cpu]); + iucv_param[cpu] = NULL; + kfree(iucv_irq_data[cpu]); + iucv_irq_data[cpu] = NULL; + return 0; +} + +static int iucv_cpu_prepare(unsigned int cpu) +{ + /* Note: GFP_DMA used to get memory below 2G */ + iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), + GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); + if (!iucv_irq_data[cpu]) + goto out_free; + + /* Allocate parameter blocks. */ + iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), + GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); + if (!iucv_param[cpu]) + goto out_free; + + iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), + GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); + if (!iucv_param_irq[cpu]) + goto out_free; + + return 0; + +out_free: + iucv_cpu_dead(cpu); + return -ENOMEM; +} + +static int iucv_cpu_online(unsigned int cpu) +{ + if (!iucv_path_table) + return 0; + iucv_declare_cpu(NULL); + return 0; +} + +static int iucv_cpu_down_prep(unsigned int cpu) +{ + cpumask_t cpumask; + + if (!iucv_path_table) + return 0; + + cpumask_copy(&cpumask, &iucv_buffer_cpumask); + cpumask_clear_cpu(cpu, &cpumask); + if (cpumask_empty(&cpumask)) + /* Can't offline last IUCV enabled cpu. */ + return -EINVAL; + + iucv_retrieve_cpu(NULL); + if (!cpumask_empty(&iucv_irq_cpumask)) + return 0; + smp_call_function_single(cpumask_first(&iucv_buffer_cpumask), + iucv_allow_cpu, NULL, 1); + return 0; +} + +/** + * iucv_sever_pathid + * @pathid: path identification number. + * @userdata: 16-bytes of user data. + * + * Sever an iucv path to free up the pathid. Used internally. + */ +static int iucv_sever_pathid(u16 pathid, u8 *userdata) +{ + union iucv_param *parm; + + parm = iucv_param_irq[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + if (userdata) + memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); + parm->ctrl.ippathid = pathid; + return iucv_call_b2f0(IUCV_SEVER, parm); +} + +/** + * __iucv_cleanup_queue + * @dummy: unused dummy argument + * + * Nop function called via smp_call_function to force work items from + * pending external iucv interrupts to the work queue. + */ +static void __iucv_cleanup_queue(void *dummy) +{ +} + +/** + * iucv_cleanup_queue + * + * Function called after a path has been severed to find all remaining + * work items for the now stale pathid. The caller needs to hold the + * iucv_table_lock. + */ +static void iucv_cleanup_queue(void) +{ + struct iucv_irq_list *p, *n; + + /* + * When a path is severed, the pathid can be reused immediately + * on a iucv connect or a connection pending interrupt. Remove + * all entries from the task queue that refer to a stale pathid + * (iucv_path_table[ix] == NULL). Only then do the iucv connect + * or deliver the connection pending interrupt. To get all the + * pending interrupts force them to the work queue by calling + * an empty function on all cpus. + */ + smp_call_function(__iucv_cleanup_queue, NULL, 1); + spin_lock_irq(&iucv_queue_lock); + list_for_each_entry_safe(p, n, &iucv_task_queue, list) { + /* Remove stale work items from the task queue. */ + if (iucv_path_table[p->data.ippathid] == NULL) { + list_del(&p->list); + kfree(p); + } + } + spin_unlock_irq(&iucv_queue_lock); +} + +/** + * iucv_register: + * @handler: address of iucv handler structure + * @smp: != 0 indicates that the handler can deal with out of order messages + * + * Registers a driver with IUCV. + * + * Returns 0 on success, -ENOMEM if the memory allocation for the pathid + * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. + */ +int iucv_register(struct iucv_handler *handler, int smp) +{ + int rc; + + if (!iucv_available) + return -ENOSYS; + mutex_lock(&iucv_register_mutex); + if (!smp) + iucv_nonsmp_handler++; + if (list_empty(&iucv_handler_list)) { + rc = iucv_enable(); + if (rc) + goto out_mutex; + } else if (!smp && iucv_nonsmp_handler == 1) + iucv_setmask_up(); + INIT_LIST_HEAD(&handler->paths); + + spin_lock_bh(&iucv_table_lock); + list_add_tail(&handler->list, &iucv_handler_list); + spin_unlock_bh(&iucv_table_lock); + rc = 0; +out_mutex: + mutex_unlock(&iucv_register_mutex); + return rc; +} +EXPORT_SYMBOL(iucv_register); + +/** + * iucv_unregister + * @handler: address of iucv handler structure + * @smp: != 0 indicates that the handler can deal with out of order messages + * + * Unregister driver from IUCV. + */ +void iucv_unregister(struct iucv_handler *handler, int smp) +{ + struct iucv_path *p, *n; + + mutex_lock(&iucv_register_mutex); + spin_lock_bh(&iucv_table_lock); + /* Remove handler from the iucv_handler_list. */ + list_del_init(&handler->list); + /* Sever all pathids still referring to the handler. */ + list_for_each_entry_safe(p, n, &handler->paths, list) { + iucv_sever_pathid(p->pathid, NULL); + iucv_path_table[p->pathid] = NULL; + list_del(&p->list); + iucv_path_free(p); + } + spin_unlock_bh(&iucv_table_lock); + if (!smp) + iucv_nonsmp_handler--; + if (list_empty(&iucv_handler_list)) + iucv_disable(); + else if (!smp && iucv_nonsmp_handler == 0) + iucv_setmask_mp(); + mutex_unlock(&iucv_register_mutex); +} +EXPORT_SYMBOL(iucv_unregister); + +static int iucv_reboot_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + int i; + + if (cpumask_empty(&iucv_irq_cpumask)) + return NOTIFY_DONE; + + cpus_read_lock(); + on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1); + preempt_disable(); + for (i = 0; i < iucv_max_pathid; i++) { + if (iucv_path_table[i]) + iucv_sever_pathid(i, NULL); + } + preempt_enable(); + cpus_read_unlock(); + iucv_disable(); + return NOTIFY_DONE; +} + +static struct notifier_block iucv_reboot_notifier = { + .notifier_call = iucv_reboot_event, +}; + +/** + * iucv_path_accept + * @path: address of iucv path structure + * @handler: address of iucv handler structure + * @userdata: 16 bytes of data reflected to the communication partner + * @private: private data passed to interrupt handlers for this path + * + * This function is issued after the user received a connection pending + * external interrupt and now wishes to complete the IUCV communication path. + * + * Returns the result of the CP IUCV call. + */ +int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, + u8 *userdata, void *private) +{ + union iucv_param *parm; + int rc; + + local_bh_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + /* Prepare parameter block. */ + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + parm->ctrl.ippathid = path->pathid; + parm->ctrl.ipmsglim = path->msglim; + if (userdata) + memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); + parm->ctrl.ipflags1 = path->flags; + + rc = iucv_call_b2f0(IUCV_ACCEPT, parm); + if (!rc) { + path->private = private; + path->msglim = parm->ctrl.ipmsglim; + path->flags = parm->ctrl.ipflags1; + } +out: + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_path_accept); + +/** + * iucv_path_connect + * @path: address of iucv path structure + * @handler: address of iucv handler structure + * @userid: 8-byte user identification + * @system: 8-byte target system identification + * @userdata: 16 bytes of data reflected to the communication partner + * @private: private data passed to interrupt handlers for this path + * + * This function establishes an IUCV path. Although the connect may complete + * successfully, you are not able to use the path until you receive an IUCV + * Connection Complete external interrupt. + * + * Returns the result of the CP IUCV call. + */ +int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, + u8 *userid, u8 *system, u8 *userdata, + void *private) +{ + union iucv_param *parm; + int rc; + + spin_lock_bh(&iucv_table_lock); + iucv_cleanup_queue(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + parm->ctrl.ipmsglim = path->msglim; + parm->ctrl.ipflags1 = path->flags; + if (userid) { + memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); + ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); + EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); + } + if (system) { + memcpy(parm->ctrl.iptarget, system, + sizeof(parm->ctrl.iptarget)); + ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); + EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); + } + if (userdata) + memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); + + rc = iucv_call_b2f0(IUCV_CONNECT, parm); + if (!rc) { + if (parm->ctrl.ippathid < iucv_max_pathid) { + path->pathid = parm->ctrl.ippathid; + path->msglim = parm->ctrl.ipmsglim; + path->flags = parm->ctrl.ipflags1; + path->handler = handler; + path->private = private; + list_add_tail(&path->list, &handler->paths); + iucv_path_table[path->pathid] = path; + } else { + iucv_sever_pathid(parm->ctrl.ippathid, + iucv_error_pathid); + rc = -EIO; + } + } +out: + spin_unlock_bh(&iucv_table_lock); + return rc; +} +EXPORT_SYMBOL(iucv_path_connect); + +/** + * iucv_path_quiesce: + * @path: address of iucv path structure + * @userdata: 16 bytes of data reflected to the communication partner + * + * This function temporarily suspends incoming messages on an IUCV path. + * You can later reactivate the path by invoking the iucv_resume function. + * + * Returns the result from the CP IUCV call. + */ +int iucv_path_quiesce(struct iucv_path *path, u8 *userdata) +{ + union iucv_param *parm; + int rc; + + local_bh_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + if (userdata) + memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); + parm->ctrl.ippathid = path->pathid; + rc = iucv_call_b2f0(IUCV_QUIESCE, parm); +out: + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_path_quiesce); + +/** + * iucv_path_resume: + * @path: address of iucv path structure + * @userdata: 16 bytes of data reflected to the communication partner + * + * This function resumes incoming messages on an IUCV path that has + * been stopped with iucv_path_quiesce. + * + * Returns the result from the CP IUCV call. + */ +int iucv_path_resume(struct iucv_path *path, u8 *userdata) +{ + union iucv_param *parm; + int rc; + + local_bh_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + if (userdata) + memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); + parm->ctrl.ippathid = path->pathid; + rc = iucv_call_b2f0(IUCV_RESUME, parm); +out: + local_bh_enable(); + return rc; +} + +/** + * iucv_path_sever + * @path: address of iucv path structure + * @userdata: 16 bytes of data reflected to the communication partner + * + * This function terminates an IUCV path. + * + * Returns the result from the CP IUCV call. + */ +int iucv_path_sever(struct iucv_path *path, u8 *userdata) +{ + int rc; + + preempt_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + if (iucv_active_cpu != smp_processor_id()) + spin_lock_bh(&iucv_table_lock); + rc = iucv_sever_pathid(path->pathid, userdata); + iucv_path_table[path->pathid] = NULL; + list_del_init(&path->list); + if (iucv_active_cpu != smp_processor_id()) + spin_unlock_bh(&iucv_table_lock); +out: + preempt_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_path_sever); + +/** + * iucv_message_purge + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @srccls: source class of message + * + * Cancels a message you have sent. + * + * Returns the result from the CP IUCV call. + */ +int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, + u32 srccls) +{ + union iucv_param *parm; + int rc; + + local_bh_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + parm->purge.ippathid = path->pathid; + parm->purge.ipmsgid = msg->id; + parm->purge.ipsrccls = srccls; + parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; + rc = iucv_call_b2f0(IUCV_PURGE, parm); + if (!rc) { + msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; + msg->tag = parm->purge.ipmsgtag; + } +out: + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_message_purge); + +/** + * iucv_message_receive_iprmdata + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @flags: how the message is received (IUCV_IPBUFLST) + * @buffer: address of data buffer or address of struct iucv_array + * @size: length of data buffer + * @residual: + * + * Internal function used by iucv_message_receive and __iucv_message_receive + * to receive RMDATA data stored in struct iucv_message. + */ +static int iucv_message_receive_iprmdata(struct iucv_path *path, + struct iucv_message *msg, + u8 flags, void *buffer, + size_t size, size_t *residual) +{ + struct iucv_array *array; + u8 *rmmsg; + size_t copy; + + /* + * Message is 8 bytes long and has been stored to the + * message descriptor itself. + */ + if (residual) + *residual = abs(size - 8); + rmmsg = msg->rmmsg; + if (flags & IUCV_IPBUFLST) { + /* Copy to struct iucv_array. */ + size = (size < 8) ? size : 8; + for (array = buffer; size > 0; array++) { + copy = min_t(size_t, size, array->length); + memcpy((u8 *)(addr_t) array->address, + rmmsg, copy); + rmmsg += copy; + size -= copy; + } + } else { + /* Copy to direct buffer. */ + memcpy(buffer, rmmsg, min_t(size_t, size, 8)); + } + return 0; +} + +/** + * __iucv_message_receive + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @flags: how the message is received (IUCV_IPBUFLST) + * @buffer: address of data buffer or address of struct iucv_array + * @size: length of data buffer + * @residual: + * + * This function receives messages that are being sent to you over + * established paths. This function will deal with RMDATA messages + * embedded in struct iucv_message as well. + * + * Locking: no locking + * + * Returns the result from the CP IUCV call. + */ +int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, + u8 flags, void *buffer, size_t size, size_t *residual) +{ + union iucv_param *parm; + int rc; + + if (msg->flags & IUCV_IPRMDATA) + return iucv_message_receive_iprmdata(path, msg, flags, + buffer, size, residual); + if (cpumask_empty(&iucv_buffer_cpumask)) + return -EIO; + + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + parm->db.ipbfadr1 = (u32)(addr_t) buffer; + parm->db.ipbfln1f = (u32) size; + parm->db.ipmsgid = msg->id; + parm->db.ippathid = path->pathid; + parm->db.iptrgcls = msg->class; + parm->db.ipflags1 = (flags | IUCV_IPFGPID | + IUCV_IPFGMID | IUCV_IPTRGCLS); + rc = iucv_call_b2f0(IUCV_RECEIVE, parm); + if (!rc || rc == 5) { + msg->flags = parm->db.ipflags1; + if (residual) + *residual = parm->db.ipbfln1f; + } + return rc; +} +EXPORT_SYMBOL(__iucv_message_receive); + +/** + * iucv_message_receive + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @flags: how the message is received (IUCV_IPBUFLST) + * @buffer: address of data buffer or address of struct iucv_array + * @size: length of data buffer + * @residual: + * + * This function receives messages that are being sent to you over + * established paths. This function will deal with RMDATA messages + * embedded in struct iucv_message as well. + * + * Locking: local_bh_enable/local_bh_disable + * + * Returns the result from the CP IUCV call. + */ +int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, + u8 flags, void *buffer, size_t size, size_t *residual) +{ + int rc; + + if (msg->flags & IUCV_IPRMDATA) + return iucv_message_receive_iprmdata(path, msg, flags, + buffer, size, residual); + local_bh_disable(); + rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_message_receive); + +/** + * iucv_message_reject + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * + * The reject function refuses a specified message. Between the time you + * are notified of a message and the time that you complete the message, + * the message may be rejected. + * + * Returns the result from the CP IUCV call. + */ +int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) +{ + union iucv_param *parm; + int rc; + + local_bh_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + parm->db.ippathid = path->pathid; + parm->db.ipmsgid = msg->id; + parm->db.iptrgcls = msg->class; + parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); + rc = iucv_call_b2f0(IUCV_REJECT, parm); +out: + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_message_reject); + +/** + * iucv_message_reply + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) + * @reply: address of reply data buffer or address of struct iucv_array + * @size: length of reply data buffer + * + * This function responds to the two-way messages that you receive. You + * must identify completely the message to which you wish to reply. ie, + * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into + * the parameter list. + * + * Returns the result from the CP IUCV call. + */ +int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, + u8 flags, void *reply, size_t size) +{ + union iucv_param *parm; + int rc; + + local_bh_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + if (flags & IUCV_IPRMDATA) { + parm->dpl.ippathid = path->pathid; + parm->dpl.ipflags1 = flags; + parm->dpl.ipmsgid = msg->id; + parm->dpl.iptrgcls = msg->class; + memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); + } else { + parm->db.ipbfadr1 = (u32)(addr_t) reply; + parm->db.ipbfln1f = (u32) size; + parm->db.ippathid = path->pathid; + parm->db.ipflags1 = flags; + parm->db.ipmsgid = msg->id; + parm->db.iptrgcls = msg->class; + } + rc = iucv_call_b2f0(IUCV_REPLY, parm); +out: + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_message_reply); + +/** + * __iucv_message_send + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) + * @srccls: source class of message + * @buffer: address of send buffer or address of struct iucv_array + * @size: length of send buffer + * + * This function transmits data to another application. Data to be + * transmitted is in a buffer and this is a one-way message and the + * receiver will not reply to the message. + * + * Locking: no locking + * + * Returns the result from the CP IUCV call. + */ +int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, + u8 flags, u32 srccls, void *buffer, size_t size) +{ + union iucv_param *parm; + int rc; + + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + if (flags & IUCV_IPRMDATA) { + /* Message of 8 bytes can be placed into the parameter list. */ + parm->dpl.ippathid = path->pathid; + parm->dpl.ipflags1 = flags | IUCV_IPNORPY; + parm->dpl.iptrgcls = msg->class; + parm->dpl.ipsrccls = srccls; + parm->dpl.ipmsgtag = msg->tag; + memcpy(parm->dpl.iprmmsg, buffer, 8); + } else { + parm->db.ipbfadr1 = (u32)(addr_t) buffer; + parm->db.ipbfln1f = (u32) size; + parm->db.ippathid = path->pathid; + parm->db.ipflags1 = flags | IUCV_IPNORPY; + parm->db.iptrgcls = msg->class; + parm->db.ipsrccls = srccls; + parm->db.ipmsgtag = msg->tag; + } + rc = iucv_call_b2f0(IUCV_SEND, parm); + if (!rc) + msg->id = parm->db.ipmsgid; +out: + return rc; +} +EXPORT_SYMBOL(__iucv_message_send); + +/** + * iucv_message_send + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) + * @srccls: source class of message + * @buffer: address of send buffer or address of struct iucv_array + * @size: length of send buffer + * + * This function transmits data to another application. Data to be + * transmitted is in a buffer and this is a one-way message and the + * receiver will not reply to the message. + * + * Locking: local_bh_enable/local_bh_disable + * + * Returns the result from the CP IUCV call. + */ +int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, + u8 flags, u32 srccls, void *buffer, size_t size) +{ + int rc; + + local_bh_disable(); + rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_message_send); + +/** + * iucv_message_send2way + * @path: address of iucv path structure + * @msg: address of iucv msg structure + * @flags: how the message is sent and the reply is received + * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) + * @srccls: source class of message + * @buffer: address of send buffer or address of struct iucv_array + * @size: length of send buffer + * @answer: address of answer buffer or address of struct iucv_array + * @asize: size of reply buffer + * @residual: ignored + * + * This function transmits data to another application. Data to be + * transmitted is in a buffer. The receiver of the send is expected to + * reply to the message and a buffer is provided into which IUCV moves + * the reply to this message. + * + * Returns the result from the CP IUCV call. + */ +int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, + u8 flags, u32 srccls, void *buffer, size_t size, + void *answer, size_t asize, size_t *residual) +{ + union iucv_param *parm; + int rc; + + local_bh_disable(); + if (cpumask_empty(&iucv_buffer_cpumask)) { + rc = -EIO; + goto out; + } + parm = iucv_param[smp_processor_id()]; + memset(parm, 0, sizeof(union iucv_param)); + if (flags & IUCV_IPRMDATA) { + parm->dpl.ippathid = path->pathid; + parm->dpl.ipflags1 = path->flags; /* priority message */ + parm->dpl.iptrgcls = msg->class; + parm->dpl.ipsrccls = srccls; + parm->dpl.ipmsgtag = msg->tag; + parm->dpl.ipbfadr2 = (u32)(addr_t) answer; + parm->dpl.ipbfln2f = (u32) asize; + memcpy(parm->dpl.iprmmsg, buffer, 8); + } else { + parm->db.ippathid = path->pathid; + parm->db.ipflags1 = path->flags; /* priority message */ + parm->db.iptrgcls = msg->class; + parm->db.ipsrccls = srccls; + parm->db.ipmsgtag = msg->tag; + parm->db.ipbfadr1 = (u32)(addr_t) buffer; + parm->db.ipbfln1f = (u32) size; + parm->db.ipbfadr2 = (u32)(addr_t) answer; + parm->db.ipbfln2f = (u32) asize; + } + rc = iucv_call_b2f0(IUCV_SEND, parm); + if (!rc) + msg->id = parm->db.ipmsgid; +out: + local_bh_enable(); + return rc; +} +EXPORT_SYMBOL(iucv_message_send2way); + +struct iucv_path_pending { + u16 ippathid; + u8 ipflags1; + u8 iptype; + u16 ipmsglim; + u16 res1; + u8 ipvmid[8]; + u8 ipuser[16]; + u32 res3; + u8 ippollfg; + u8 res4[3]; +} __packed; + +/** + * iucv_path_pending + * @data: Pointer to external interrupt buffer + * + * Process connection pending work item. Called from tasklet while holding + * iucv_table_lock. + */ +static void iucv_path_pending(struct iucv_irq_data *data) +{ + struct iucv_path_pending *ipp = (void *) data; + struct iucv_handler *handler; + struct iucv_path *path; + char *error; + + BUG_ON(iucv_path_table[ipp->ippathid]); + /* New pathid, handler found. Create a new path struct. */ + error = iucv_error_no_memory; + path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); + if (!path) + goto out_sever; + path->pathid = ipp->ippathid; + iucv_path_table[path->pathid] = path; + EBCASC(ipp->ipvmid, 8); + + /* Call registered handler until one is found that wants the path. */ + list_for_each_entry(handler, &iucv_handler_list, list) { + if (!handler->path_pending) + continue; + /* + * Add path to handler to allow a call to iucv_path_sever + * inside the path_pending function. If the handler returns + * an error remove the path from the handler again. + */ + list_add(&path->list, &handler->paths); + path->handler = handler; + if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) + return; + list_del(&path->list); + path->handler = NULL; + } + /* No handler wanted the path. */ + iucv_path_table[path->pathid] = NULL; + iucv_path_free(path); + error = iucv_error_no_listener; +out_sever: + iucv_sever_pathid(ipp->ippathid, error); +} + +struct iucv_path_complete { + u16 ippathid; + u8 ipflags1; + u8 iptype; + u16 ipmsglim; + u16 res1; + u8 res2[8]; + u8 ipuser[16]; + u32 res3; + u8 ippollfg; + u8 res4[3]; +} __packed; + +/** + * iucv_path_complete + * @data: Pointer to external interrupt buffer + * + * Process connection complete work item. Called from tasklet while holding + * iucv_table_lock. + */ +static void iucv_path_complete(struct iucv_irq_data *data) +{ + struct iucv_path_complete *ipc = (void *) data; + struct iucv_path *path = iucv_path_table[ipc->ippathid]; + + if (path) + path->flags = ipc->ipflags1; + if (path && path->handler && path->handler->path_complete) + path->handler->path_complete(path, ipc->ipuser); +} + +struct iucv_path_severed { + u16 ippathid; + u8 res1; + u8 iptype; + u32 res2; + u8 res3[8]; + u8 ipuser[16]; + u32 res4; + u8 ippollfg; + u8 res5[3]; +} __packed; + +/** + * iucv_path_severed + * @data: Pointer to external interrupt buffer + * + * Process connection severed work item. Called from tasklet while holding + * iucv_table_lock. + */ +static void iucv_path_severed(struct iucv_irq_data *data) +{ + struct iucv_path_severed *ips = (void *) data; + struct iucv_path *path = iucv_path_table[ips->ippathid]; + + if (!path || !path->handler) /* Already severed */ + return; + if (path->handler->path_severed) + path->handler->path_severed(path, ips->ipuser); + else { + iucv_sever_pathid(path->pathid, NULL); + iucv_path_table[path->pathid] = NULL; + list_del(&path->list); + iucv_path_free(path); + } +} + +struct iucv_path_quiesced { + u16 ippathid; + u8 res1; + u8 iptype; + u32 res2; + u8 res3[8]; + u8 ipuser[16]; + u32 res4; + u8 ippollfg; + u8 res5[3]; +} __packed; + +/** + * iucv_path_quiesced + * @data: Pointer to external interrupt buffer + * + * Process connection quiesced work item. Called from tasklet while holding + * iucv_table_lock. + */ +static void iucv_path_quiesced(struct iucv_irq_data *data) +{ + struct iucv_path_quiesced *ipq = (void *) data; + struct iucv_path *path = iucv_path_table[ipq->ippathid]; + + if (path && path->handler && path->handler->path_quiesced) + path->handler->path_quiesced(path, ipq->ipuser); +} + +struct iucv_path_resumed { + u16 ippathid; + u8 res1; + u8 iptype; + u32 res2; + u8 res3[8]; + u8 ipuser[16]; + u32 res4; + u8 ippollfg; + u8 res5[3]; +} __packed; + +/** + * iucv_path_resumed + * @data: Pointer to external interrupt buffer + * + * Process connection resumed work item. Called from tasklet while holding + * iucv_table_lock. + */ +static void iucv_path_resumed(struct iucv_irq_data *data) +{ + struct iucv_path_resumed *ipr = (void *) data; + struct iucv_path *path = iucv_path_table[ipr->ippathid]; + + if (path && path->handler && path->handler->path_resumed) + path->handler->path_resumed(path, ipr->ipuser); +} + +struct iucv_message_complete { + u16 ippathid; + u8 ipflags1; + u8 iptype; + u32 ipmsgid; + u32 ipaudit; + u8 iprmmsg[8]; + u32 ipsrccls; + u32 ipmsgtag; + u32 res; + u32 ipbfln2f; + u8 ippollfg; + u8 res2[3]; +} __packed; + +/** + * iucv_message_complete + * @data: Pointer to external interrupt buffer + * + * Process message complete work item. Called from tasklet while holding + * iucv_table_lock. + */ +static void iucv_message_complete(struct iucv_irq_data *data) +{ + struct iucv_message_complete *imc = (void *) data; + struct iucv_path *path = iucv_path_table[imc->ippathid]; + struct iucv_message msg; + + if (path && path->handler && path->handler->message_complete) { + msg.flags = imc->ipflags1; + msg.id = imc->ipmsgid; + msg.audit = imc->ipaudit; + memcpy(msg.rmmsg, imc->iprmmsg, 8); + msg.class = imc->ipsrccls; + msg.tag = imc->ipmsgtag; + msg.length = imc->ipbfln2f; + path->handler->message_complete(path, &msg); + } +} + +struct iucv_message_pending { + u16 ippathid; + u8 ipflags1; + u8 iptype; + u32 ipmsgid; + u32 iptrgcls; + struct { + union { + u32 iprmmsg1_u32; + u8 iprmmsg1[4]; + } ln1msg1; + union { + u32 ipbfln1f; + u8 iprmmsg2[4]; + } ln1msg2; + } rmmsg; + u32 res1[3]; + u32 ipbfln2f; + u8 ippollfg; + u8 res2[3]; +} __packed; + +/** + * iucv_message_pending + * @data: Pointer to external interrupt buffer + * + * Process message pending work item. Called from tasklet while holding + * iucv_table_lock. + */ +static void iucv_message_pending(struct iucv_irq_data *data) +{ + struct iucv_message_pending *imp = (void *) data; + struct iucv_path *path = iucv_path_table[imp->ippathid]; + struct iucv_message msg; + + if (path && path->handler && path->handler->message_pending) { + msg.flags = imp->ipflags1; + msg.id = imp->ipmsgid; + msg.class = imp->iptrgcls; + if (imp->ipflags1 & IUCV_IPRMDATA) { + memcpy(msg.rmmsg, &imp->rmmsg, 8); + msg.length = 8; + } else + msg.length = imp->rmmsg.ln1msg2.ipbfln1f; + msg.reply_size = imp->ipbfln2f; + path->handler->message_pending(path, &msg); + } +} + +/* + * iucv_tasklet_fn: + * + * This tasklet loops over the queue of irq buffers created by + * iucv_external_interrupt, calls the appropriate action handler + * and then frees the buffer. + */ +static void iucv_tasklet_fn(unsigned long ignored) +{ + typedef void iucv_irq_fn(struct iucv_irq_data *); + static iucv_irq_fn *irq_fn[] = { + [0x02] = iucv_path_complete, + [0x03] = iucv_path_severed, + [0x04] = iucv_path_quiesced, + [0x05] = iucv_path_resumed, + [0x06] = iucv_message_complete, + [0x07] = iucv_message_complete, + [0x08] = iucv_message_pending, + [0x09] = iucv_message_pending, + }; + LIST_HEAD(task_queue); + struct iucv_irq_list *p, *n; + + /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ + if (!spin_trylock(&iucv_table_lock)) { + tasklet_schedule(&iucv_tasklet); + return; + } + iucv_active_cpu = smp_processor_id(); + + spin_lock_irq(&iucv_queue_lock); + list_splice_init(&iucv_task_queue, &task_queue); + spin_unlock_irq(&iucv_queue_lock); + + list_for_each_entry_safe(p, n, &task_queue, list) { + list_del_init(&p->list); + irq_fn[p->data.iptype](&p->data); + kfree(p); + } + + iucv_active_cpu = -1; + spin_unlock(&iucv_table_lock); +} + +/* + * iucv_work_fn: + * + * This work function loops over the queue of path pending irq blocks + * created by iucv_external_interrupt, calls the appropriate action + * handler and then frees the buffer. + */ +static void iucv_work_fn(struct work_struct *work) +{ + LIST_HEAD(work_queue); + struct iucv_irq_list *p, *n; + + /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ + spin_lock_bh(&iucv_table_lock); + iucv_active_cpu = smp_processor_id(); + + spin_lock_irq(&iucv_queue_lock); + list_splice_init(&iucv_work_queue, &work_queue); + spin_unlock_irq(&iucv_queue_lock); + + iucv_cleanup_queue(); + list_for_each_entry_safe(p, n, &work_queue, list) { + list_del_init(&p->list); + iucv_path_pending(&p->data); + kfree(p); + } + + iucv_active_cpu = -1; + spin_unlock_bh(&iucv_table_lock); +} + +/* + * iucv_external_interrupt + * + * Handles external interrupts coming in from CP. + * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). + */ +static void iucv_external_interrupt(struct ext_code ext_code, + unsigned int param32, unsigned long param64) +{ + struct iucv_irq_data *p; + struct iucv_irq_list *work; + + inc_irq_stat(IRQEXT_IUC); + p = iucv_irq_data[smp_processor_id()]; + if (p->ippathid >= iucv_max_pathid) { + WARN_ON(p->ippathid >= iucv_max_pathid); + iucv_sever_pathid(p->ippathid, iucv_error_no_listener); + return; + } + BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); + work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); + if (!work) { + pr_warn("iucv_external_interrupt: out of memory\n"); + return; + } + memcpy(&work->data, p, sizeof(work->data)); + spin_lock(&iucv_queue_lock); + if (p->iptype == 0x01) { + /* Path pending interrupt. */ + list_add_tail(&work->list, &iucv_work_queue); + schedule_work(&iucv_work); + } else { + /* The other interrupts. */ + list_add_tail(&work->list, &iucv_task_queue); + tasklet_schedule(&iucv_tasklet); + } + spin_unlock(&iucv_queue_lock); +} + +struct iucv_interface iucv_if = { + .message_receive = iucv_message_receive, + .__message_receive = __iucv_message_receive, + .message_reply = iucv_message_reply, + .message_reject = iucv_message_reject, + .message_send = iucv_message_send, + .__message_send = __iucv_message_send, + .message_send2way = iucv_message_send2way, + .message_purge = iucv_message_purge, + .path_accept = iucv_path_accept, + .path_connect = iucv_path_connect, + .path_quiesce = iucv_path_quiesce, + .path_resume = iucv_path_resume, + .path_sever = iucv_path_sever, + .iucv_register = iucv_register, + .iucv_unregister = iucv_unregister, + .bus = NULL, + .root = NULL, +}; +EXPORT_SYMBOL(iucv_if); + +static enum cpuhp_state iucv_online; +/** + * iucv_init + * + * Allocates and initializes various data structures. + */ +static int __init iucv_init(void) +{ + int rc; + + if (!MACHINE_IS_VM) { + rc = -EPROTONOSUPPORT; + goto out; + } + ctl_set_bit(0, 1); + rc = iucv_query_maxconn(); + if (rc) + goto out_ctl; + rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); + if (rc) + goto out_ctl; + iucv_root = root_device_register("iucv"); + if (IS_ERR(iucv_root)) { + rc = PTR_ERR(iucv_root); + goto out_int; + } + + rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare", + iucv_cpu_prepare, iucv_cpu_dead); + if (rc) + goto out_dev; + rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online", + iucv_cpu_online, iucv_cpu_down_prep); + if (rc < 0) + goto out_prep; + iucv_online = rc; + + rc = register_reboot_notifier(&iucv_reboot_notifier); + if (rc) + goto out_remove_hp; + ASCEBC(iucv_error_no_listener, 16); + ASCEBC(iucv_error_no_memory, 16); + ASCEBC(iucv_error_pathid, 16); + iucv_available = 1; + rc = bus_register(&iucv_bus); + if (rc) + goto out_reboot; + iucv_if.root = iucv_root; + iucv_if.bus = &iucv_bus; + return 0; + +out_reboot: + unregister_reboot_notifier(&iucv_reboot_notifier); +out_remove_hp: + cpuhp_remove_state(iucv_online); +out_prep: + cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); +out_dev: + root_device_unregister(iucv_root); +out_int: + unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); +out_ctl: + ctl_clear_bit(0, 1); +out: + return rc; +} + +/** + * iucv_exit + * + * Frees everything allocated from iucv_init. + */ +static void __exit iucv_exit(void) +{ + struct iucv_irq_list *p, *n; + + spin_lock_irq(&iucv_queue_lock); + list_for_each_entry_safe(p, n, &iucv_task_queue, list) + kfree(p); + list_for_each_entry_safe(p, n, &iucv_work_queue, list) + kfree(p); + spin_unlock_irq(&iucv_queue_lock); + unregister_reboot_notifier(&iucv_reboot_notifier); + + cpuhp_remove_state_nocalls(iucv_online); + cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); + root_device_unregister(iucv_root); + bus_unregister(&iucv_bus); + unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); +} + +subsys_initcall(iucv_init); +module_exit(iucv_exit); + +MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); +MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); +MODULE_LICENSE("GPL"); |