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d69d804845
In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki <rafael@kernel.org> Reviewed-by: Alex Elder <elder@kernel.org> Acked-by: Sumit Garg <sumit.garg@linaro.org> Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1953 lines
48 KiB
C
1953 lines
48 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IUCV base infrastructure.
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*
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* Copyright IBM Corp. 2001, 2009
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*
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* Author(s):
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* Original source:
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* Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
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* Xenia Tkatschow (xenia@us.ibm.com)
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* 2Gb awareness and general cleanup:
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* Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
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* Rewritten for af_iucv:
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* PM functions:
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* Ursula Braun (ursula.braun@de.ibm.com)
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*
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* Documentation used:
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* The original source
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* CP Programming Service, IBM document # SC24-5760
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*/
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#define KMSG_COMPONENT "iucv"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/spinlock.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/cpu.h>
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#include <linux/reboot.h>
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#include <net/iucv/iucv.h>
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#include <linux/atomic.h>
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#include <asm/ebcdic.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/smp.h>
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/*
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* FLAGS:
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* All flags are defined in the field IPFLAGS1 of each function
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* and can be found in CP Programming Services.
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* IPSRCCLS - Indicates you have specified a source class.
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* IPTRGCLS - Indicates you have specified a target class.
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* IPFGPID - Indicates you have specified a pathid.
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* IPFGMID - Indicates you have specified a message ID.
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* IPNORPY - Indicates a one-way message. No reply expected.
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* IPALL - Indicates that all paths are affected.
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*/
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#define IUCV_IPSRCCLS 0x01
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#define IUCV_IPTRGCLS 0x01
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#define IUCV_IPFGPID 0x02
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#define IUCV_IPFGMID 0x04
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#define IUCV_IPNORPY 0x10
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#define IUCV_IPALL 0x80
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static int iucv_bus_match(struct device *dev, const struct device_driver *drv)
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{
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return 0;
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}
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const struct bus_type iucv_bus = {
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.name = "iucv",
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.match = iucv_bus_match,
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};
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EXPORT_SYMBOL(iucv_bus);
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static struct device *iucv_root;
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static void iucv_release_device(struct device *device)
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{
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kfree(device);
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}
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struct device *iucv_alloc_device(const struct attribute_group **attrs,
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struct device_driver *driver,
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void *priv, const char *fmt, ...)
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{
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struct device *dev;
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va_list vargs;
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int rc;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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goto out_error;
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va_start(vargs, fmt);
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rc = dev_set_name(dev, fmt, vargs);
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va_end(vargs);
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if (rc)
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goto out_error;
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dev->bus = &iucv_bus;
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dev->parent = iucv_root;
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dev->driver = driver;
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dev->groups = attrs;
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dev->release = iucv_release_device;
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dev_set_drvdata(dev, priv);
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return dev;
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out_error:
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kfree(dev);
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return NULL;
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}
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EXPORT_SYMBOL(iucv_alloc_device);
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static int iucv_available;
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/* General IUCV interrupt structure */
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struct iucv_irq_data {
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u16 ippathid;
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u8 ipflags1;
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u8 iptype;
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u32 res2[9];
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};
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struct iucv_irq_list {
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struct list_head list;
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struct iucv_irq_data data;
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};
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static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
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static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
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static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
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/*
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* Queue of interrupt buffers lock for delivery via the tasklet
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* (fast but can't call smp_call_function).
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*/
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static LIST_HEAD(iucv_task_queue);
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/*
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* The tasklet for fast delivery of iucv interrupts.
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*/
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static void iucv_tasklet_fn(unsigned long);
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static DECLARE_TASKLET_OLD(iucv_tasklet, iucv_tasklet_fn);
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/*
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* Queue of interrupt buffers for delivery via a work queue
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* (slower but can call smp_call_function).
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*/
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static LIST_HEAD(iucv_work_queue);
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/*
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* The work element to deliver path pending interrupts.
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*/
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static void iucv_work_fn(struct work_struct *work);
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static DECLARE_WORK(iucv_work, iucv_work_fn);
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/*
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* Spinlock protecting task and work queue.
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*/
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static DEFINE_SPINLOCK(iucv_queue_lock);
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enum iucv_command_codes {
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IUCV_QUERY = 0,
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IUCV_RETRIEVE_BUFFER = 2,
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IUCV_SEND = 4,
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IUCV_RECEIVE = 5,
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IUCV_REPLY = 6,
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IUCV_REJECT = 8,
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IUCV_PURGE = 9,
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IUCV_ACCEPT = 10,
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IUCV_CONNECT = 11,
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IUCV_DECLARE_BUFFER = 12,
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IUCV_QUIESCE = 13,
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IUCV_RESUME = 14,
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IUCV_SEVER = 15,
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IUCV_SETMASK = 16,
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IUCV_SETCONTROLMASK = 17,
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};
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/*
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* Error messages that are used with the iucv_sever function. They get
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* converted to EBCDIC.
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*/
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static char iucv_error_no_listener[16] = "NO LISTENER";
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static char iucv_error_no_memory[16] = "NO MEMORY";
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static char iucv_error_pathid[16] = "INVALID PATHID";
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/*
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* iucv_handler_list: List of registered handlers.
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*/
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static LIST_HEAD(iucv_handler_list);
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/*
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* iucv_path_table: array of pointers to iucv_path structures.
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*/
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static struct iucv_path **iucv_path_table;
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static unsigned long iucv_max_pathid;
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/*
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* iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
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*/
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static DEFINE_SPINLOCK(iucv_table_lock);
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/*
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* iucv_active_cpu: contains the number of the cpu executing the tasklet
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* or the work handler. Needed for iucv_path_sever called from tasklet.
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*/
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static int iucv_active_cpu = -1;
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/*
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* Mutex and wait queue for iucv_register/iucv_unregister.
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*/
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static DEFINE_MUTEX(iucv_register_mutex);
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/*
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* Counter for number of non-smp capable handlers.
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*/
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static int iucv_nonsmp_handler;
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/*
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* IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
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* iucv_path_quiesce and iucv_path_sever.
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*/
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struct iucv_cmd_control {
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u16 ippathid;
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u8 ipflags1;
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u8 iprcode;
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u16 ipmsglim;
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u16 res1;
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u8 ipvmid[8];
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u8 ipuser[16];
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u8 iptarget[8];
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} __attribute__ ((packed,aligned(8)));
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/*
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* Data in parameter list iucv structure. Used by iucv_message_send,
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* iucv_message_send2way and iucv_message_reply.
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*/
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struct iucv_cmd_dpl {
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u16 ippathid;
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u8 ipflags1;
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u8 iprcode;
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u32 ipmsgid;
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u32 iptrgcls;
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u8 iprmmsg[8];
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u32 ipsrccls;
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u32 ipmsgtag;
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dma32_t ipbfadr2;
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u32 ipbfln2f;
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u32 res;
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} __attribute__ ((packed,aligned(8)));
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/*
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* Data in buffer iucv structure. Used by iucv_message_receive,
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* iucv_message_reject, iucv_message_send, iucv_message_send2way
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* and iucv_declare_cpu.
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*/
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struct iucv_cmd_db {
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u16 ippathid;
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u8 ipflags1;
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u8 iprcode;
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u32 ipmsgid;
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u32 iptrgcls;
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dma32_t ipbfadr1;
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u32 ipbfln1f;
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u32 ipsrccls;
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u32 ipmsgtag;
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dma32_t ipbfadr2;
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u32 ipbfln2f;
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u32 res;
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} __attribute__ ((packed,aligned(8)));
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/*
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* Purge message iucv structure. Used by iucv_message_purge.
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*/
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struct iucv_cmd_purge {
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u16 ippathid;
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u8 ipflags1;
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u8 iprcode;
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u32 ipmsgid;
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u8 ipaudit[3];
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u8 res1[5];
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u32 res2;
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u32 ipsrccls;
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u32 ipmsgtag;
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u32 res3[3];
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} __attribute__ ((packed,aligned(8)));
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/*
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* Set mask iucv structure. Used by iucv_enable_cpu.
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*/
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struct iucv_cmd_set_mask {
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u8 ipmask;
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u8 res1[2];
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u8 iprcode;
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u32 res2[9];
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} __attribute__ ((packed,aligned(8)));
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union iucv_param {
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struct iucv_cmd_control ctrl;
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struct iucv_cmd_dpl dpl;
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struct iucv_cmd_db db;
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struct iucv_cmd_purge purge;
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struct iucv_cmd_set_mask set_mask;
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};
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/*
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* Anchor for per-cpu IUCV command parameter block.
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*/
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static union iucv_param *iucv_param[NR_CPUS];
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static union iucv_param *iucv_param_irq[NR_CPUS];
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/**
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* __iucv_call_b2f0
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* @command: identifier of IUCV call to CP.
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* @parm: pointer to a struct iucv_parm block
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*
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* Calls CP to execute IUCV commands.
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*
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* Returns the result of the CP IUCV call.
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*/
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static inline int __iucv_call_b2f0(int command, union iucv_param *parm)
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{
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unsigned long reg1 = virt_to_phys(parm);
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int cc;
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asm volatile(
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" lgr 0,%[reg0]\n"
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" lgr 1,%[reg1]\n"
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" .long 0xb2f01000\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=&d" (cc), "+m" (*parm)
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: [reg0] "d" ((unsigned long)command),
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[reg1] "d" (reg1)
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: "cc", "0", "1");
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return cc;
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}
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static inline int iucv_call_b2f0(int command, union iucv_param *parm)
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{
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int ccode;
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ccode = __iucv_call_b2f0(command, parm);
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return ccode == 1 ? parm->ctrl.iprcode : ccode;
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}
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/*
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* iucv_query_maxconn
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*
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* Determines the maximum number of connections that may be established.
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*
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* Returns the maximum number of connections or -EPERM is IUCV is not
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* available.
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*/
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static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
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{
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unsigned long reg1 = virt_to_phys(param);
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int cc;
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asm volatile (
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" lghi 0,%[cmd]\n"
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" lgr 1,%[reg1]\n"
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" .long 0xb2f01000\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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" lgr %[reg1],1\n"
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: [cc] "=&d" (cc), [reg1] "+&d" (reg1)
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: [cmd] "K" (IUCV_QUERY)
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: "cc", "0", "1");
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*max_pathid = reg1;
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return cc;
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}
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static int iucv_query_maxconn(void)
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{
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unsigned long max_pathid;
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void *param;
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int ccode;
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param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
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if (!param)
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return -ENOMEM;
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ccode = __iucv_query_maxconn(param, &max_pathid);
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if (ccode == 0)
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iucv_max_pathid = max_pathid;
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kfree(param);
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return ccode ? -EPERM : 0;
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}
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/**
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* iucv_allow_cpu
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* @data: unused
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*
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* Allow iucv interrupts on this cpu.
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*/
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static void iucv_allow_cpu(void *data)
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{
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int cpu = smp_processor_id();
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union iucv_param *parm;
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/*
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* Enable all iucv interrupts.
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* ipmask contains bits for the different interrupts
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* 0x80 - Flag to allow nonpriority message pending interrupts
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* 0x40 - Flag to allow priority message pending interrupts
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* 0x20 - Flag to allow nonpriority message completion interrupts
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* 0x10 - Flag to allow priority message completion interrupts
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* 0x08 - Flag to allow IUCV control interrupts
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*/
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parm = iucv_param_irq[cpu];
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memset(parm, 0, sizeof(union iucv_param));
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parm->set_mask.ipmask = 0xf8;
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iucv_call_b2f0(IUCV_SETMASK, parm);
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/*
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* Enable all iucv control interrupts.
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* ipmask contains bits for the different interrupts
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* 0x80 - Flag to allow pending connections interrupts
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* 0x40 - Flag to allow connection complete interrupts
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* 0x20 - Flag to allow connection severed interrupts
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* 0x10 - Flag to allow connection quiesced interrupts
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* 0x08 - Flag to allow connection resumed interrupts
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*/
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memset(parm, 0, sizeof(union iucv_param));
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parm->set_mask.ipmask = 0xf8;
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iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
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/* Set indication that iucv interrupts are allowed for this cpu. */
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cpumask_set_cpu(cpu, &iucv_irq_cpumask);
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}
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/**
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* iucv_block_cpu
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* @data: unused
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*
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* Block iucv interrupts on this cpu.
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*/
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static void iucv_block_cpu(void *data)
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{
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int cpu = smp_processor_id();
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union iucv_param *parm;
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/* Disable all iucv interrupts. */
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parm = iucv_param_irq[cpu];
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memset(parm, 0, sizeof(union iucv_param));
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iucv_call_b2f0(IUCV_SETMASK, parm);
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/* Clear indication that iucv interrupts are allowed for this cpu. */
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cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
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}
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/**
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* iucv_declare_cpu
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* @data: unused
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*
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* Declare a interrupt buffer on this cpu.
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*/
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static void iucv_declare_cpu(void *data)
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{
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int cpu = smp_processor_id();
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union iucv_param *parm;
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int rc;
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if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
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return;
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/* Declare interrupt buffer. */
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parm = iucv_param_irq[cpu];
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memset(parm, 0, sizeof(union iucv_param));
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parm->db.ipbfadr1 = virt_to_dma32(iucv_irq_data[cpu]);
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rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
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if (rc) {
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char *err = "Unknown";
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switch (rc) {
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case 0x03:
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err = "Directory error";
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break;
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case 0x0a:
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err = "Invalid length";
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break;
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case 0x13:
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err = "Buffer already exists";
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break;
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case 0x3e:
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err = "Buffer overlap";
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break;
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case 0x5c:
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err = "Paging or storage error";
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break;
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}
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pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
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cpu, rc, err);
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return;
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}
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/* Set indication that an iucv buffer exists for this cpu. */
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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)
|
|
{
|
|
static 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(*iucv_path_table);
|
|
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_var_t cpumask;
|
|
int ret = 0;
|
|
|
|
if (!iucv_path_table)
|
|
return 0;
|
|
|
|
if (!alloc_cpumask_var(&cpumask, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
cpumask_copy(cpumask, &iucv_buffer_cpumask);
|
|
cpumask_clear_cpu(cpu, cpumask);
|
|
if (cpumask_empty(cpumask)) {
|
|
/* Can't offline last IUCV enabled cpu. */
|
|
ret = -EINVAL;
|
|
goto __free_cpumask;
|
|
}
|
|
|
|
iucv_retrieve_cpu(NULL);
|
|
if (!cpumask_empty(&iucv_irq_cpumask))
|
|
goto __free_cpumask;
|
|
|
|
smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
|
|
iucv_allow_cpu, NULL, 1);
|
|
|
|
__free_cpumask:
|
|
free_cpumask_var(cpumask);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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(dma32_to_virt(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 = virt_to_dma32(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 = virt_to_dma32(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 = virt_to_dma32(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 = virt_to_dma32(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 = virt_to_dma32(buffer);
|
|
parm->db.ipbfln1f = (u32) size;
|
|
parm->db.ipbfadr2 = virt_to_dma32(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;
|
|
}
|
|
system_ctl_set_bit(0, CR0_IUCV_BIT);
|
|
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:
|
|
system_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");
|