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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * IUCV base infrastructure.
- *
- * Copyright IBM Corp. 2001, 2009
- *
- * Author(s):
- * Original source:
- * Alan Altmark ([email protected]) Sept. 2000
- * Xenia Tkatschow ([email protected])
- * 2Gb awareness and general cleanup:
- * Fritz Elfert ([email protected], [email protected])
- * Rewritten for af_iucv:
- * Martin Schwidefsky <[email protected]>
- * PM functions:
- * Ursula Braun ([email protected])
- *
- * 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 ([email protected])");
- MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
- MODULE_LICENSE("GPL");
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