mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 16:26:39 +07:00
b0744bd292
Convert the common I/O layer to use the klist interfaces. This patch has been adapted from the previous version to the changed interface semantics. Also, gcc 4.0 compile warnings have been removed. Signed-off-by: Cornelia Huck <cohuck@de.ibm.com> Cc: Greg KH <greg@kroah.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1138 lines
27 KiB
C
1138 lines
27 KiB
C
/*
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* drivers/s390/cio/device.c
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* bus driver for ccw devices
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* $Revision: 1.131 $
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Arnd Bergmann (arndb@de.ibm.com)
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* Cornelia Huck (cohuck@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/workqueue.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include "cio.h"
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#include "css.h"
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#include "device.h"
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#include "ioasm.h"
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/******************* bus type handling ***********************/
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/* The Linux driver model distinguishes between a bus type and
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* the bus itself. Of course we only have one channel
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* subsystem driver and one channel system per machine, but
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* we still use the abstraction. T.R. says it's a good idea. */
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static int
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ccw_bus_match (struct device * dev, struct device_driver * drv)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_driver *cdrv = to_ccwdrv(drv);
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const struct ccw_device_id *ids = cdrv->ids, *found;
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if (!ids)
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return 0;
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found = ccw_device_id_match(ids, &cdev->id);
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if (!found)
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return 0;
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cdev->id.driver_info = found->driver_info;
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return 1;
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}
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/*
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* Hotplugging interface for ccw devices.
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* Heavily modeled on pci and usb hotplug.
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*/
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static int
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ccw_hotplug (struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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int i = 0;
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int length = 0;
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if (!cdev)
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return -ENODEV;
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/* what we want to pass to /sbin/hotplug */
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envp[i++] = buffer;
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length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X",
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cdev->id.cu_type);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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++length;
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buffer += length;
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envp[i++] = buffer;
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length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X",
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cdev->id.cu_model);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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++length;
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buffer += length;
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/* The next two can be zero, that's ok for us */
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envp[i++] = buffer;
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length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X",
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cdev->id.dev_type);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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++length;
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buffer += length;
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envp[i++] = buffer;
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length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X",
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cdev->id.dev_model);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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envp[i] = 0;
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return 0;
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}
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struct bus_type ccw_bus_type = {
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.name = "ccw",
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.match = &ccw_bus_match,
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.hotplug = &ccw_hotplug,
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};
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static int io_subchannel_probe (struct device *);
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static int io_subchannel_remove (struct device *);
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void io_subchannel_irq (struct device *);
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static int io_subchannel_notify(struct device *, int);
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static void io_subchannel_verify(struct device *);
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static void io_subchannel_ioterm(struct device *);
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static void io_subchannel_shutdown(struct device *);
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struct css_driver io_subchannel_driver = {
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.subchannel_type = SUBCHANNEL_TYPE_IO,
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.drv = {
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.name = "io_subchannel",
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.bus = &css_bus_type,
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.probe = &io_subchannel_probe,
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.remove = &io_subchannel_remove,
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.shutdown = &io_subchannel_shutdown,
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},
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.irq = io_subchannel_irq,
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.notify = io_subchannel_notify,
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.verify = io_subchannel_verify,
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.termination = io_subchannel_ioterm,
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};
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struct workqueue_struct *ccw_device_work;
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struct workqueue_struct *ccw_device_notify_work;
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static wait_queue_head_t ccw_device_init_wq;
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static atomic_t ccw_device_init_count;
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static int __init
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init_ccw_bus_type (void)
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{
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int ret;
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init_waitqueue_head(&ccw_device_init_wq);
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atomic_set(&ccw_device_init_count, 0);
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ccw_device_work = create_singlethread_workqueue("cio");
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if (!ccw_device_work)
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return -ENOMEM; /* FIXME: better errno ? */
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ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
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if (!ccw_device_notify_work) {
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ret = -ENOMEM; /* FIXME: better errno ? */
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goto out_err;
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}
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slow_path_wq = create_singlethread_workqueue("kslowcrw");
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if (!slow_path_wq) {
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ret = -ENOMEM; /* FIXME: better errno ? */
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goto out_err;
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}
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if ((ret = bus_register (&ccw_bus_type)))
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goto out_err;
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if ((ret = driver_register(&io_subchannel_driver.drv)))
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goto out_err;
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wait_event(ccw_device_init_wq,
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atomic_read(&ccw_device_init_count) == 0);
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flush_workqueue(ccw_device_work);
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return 0;
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out_err:
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if (ccw_device_work)
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destroy_workqueue(ccw_device_work);
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if (ccw_device_notify_work)
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destroy_workqueue(ccw_device_notify_work);
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if (slow_path_wq)
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destroy_workqueue(slow_path_wq);
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return ret;
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}
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static void __exit
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cleanup_ccw_bus_type (void)
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{
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driver_unregister(&io_subchannel_driver.drv);
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bus_unregister(&ccw_bus_type);
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destroy_workqueue(ccw_device_notify_work);
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destroy_workqueue(ccw_device_work);
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}
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subsys_initcall(init_ccw_bus_type);
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module_exit(cleanup_ccw_bus_type);
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/************************ device handling **************************/
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/*
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* A ccw_device has some interfaces in sysfs in addition to the
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* standard ones.
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* The following entries are designed to export the information which
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* resided in 2.4 in /proc/subchannels. Subchannel and device number
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* are obvious, so they don't have an entry :)
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* TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
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*/
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static ssize_t
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chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
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{
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struct subchannel *sch = to_subchannel(dev);
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struct ssd_info *ssd = &sch->ssd_info;
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ssize_t ret = 0;
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int chp;
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for (chp = 0; chp < 8; chp++)
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ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
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ret += sprintf (buf+ret, "\n");
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return min((ssize_t)PAGE_SIZE, ret);
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}
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static ssize_t
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pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
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{
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struct subchannel *sch = to_subchannel(dev);
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struct pmcw *pmcw = &sch->schib.pmcw;
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return sprintf (buf, "%02x %02x %02x\n",
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pmcw->pim, pmcw->pam, pmcw->pom);
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}
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static ssize_t
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devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_device_id *id = &(cdev->id);
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if (id->dev_type != 0)
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return sprintf(buf, "%04x/%02x\n",
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id->dev_type, id->dev_model);
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else
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return sprintf(buf, "n/a\n");
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}
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static ssize_t
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cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_device_id *id = &(cdev->id);
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return sprintf(buf, "%04x/%02x\n",
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id->cu_type, id->cu_model);
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}
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static ssize_t
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online_show (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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return sprintf(buf, cdev->online ? "1\n" : "0\n");
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}
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static void
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ccw_device_remove_disconnected(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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/*
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* Forced offline in disconnected state means
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* 'throw away device'.
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*/
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sch = to_subchannel(cdev->dev.parent);
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device_unregister(&sch->dev);
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/* Reset intparm to zeroes. */
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sch->schib.pmcw.intparm = 0;
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cio_modify(sch);
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put_device(&sch->dev);
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}
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int
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ccw_device_set_offline(struct ccw_device *cdev)
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{
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int ret;
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if (!cdev)
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return -ENODEV;
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if (!cdev->online || !cdev->drv)
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return -EINVAL;
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if (cdev->drv->set_offline) {
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ret = cdev->drv->set_offline(cdev);
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if (ret != 0)
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return ret;
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}
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cdev->online = 0;
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spin_lock_irq(cdev->ccwlock);
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ret = ccw_device_offline(cdev);
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if (ret == -ENODEV) {
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if (cdev->private->state != DEV_STATE_NOT_OPER) {
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cdev->private->state = DEV_STATE_OFFLINE;
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dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
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}
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spin_unlock_irq(cdev->ccwlock);
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return ret;
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}
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spin_unlock_irq(cdev->ccwlock);
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if (ret == 0)
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wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
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else {
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pr_debug("ccw_device_offline returned %d, device %s\n",
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ret, cdev->dev.bus_id);
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cdev->online = 1;
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}
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return ret;
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}
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int
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ccw_device_set_online(struct ccw_device *cdev)
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{
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int ret;
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if (!cdev)
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return -ENODEV;
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if (cdev->online || !cdev->drv)
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return -EINVAL;
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spin_lock_irq(cdev->ccwlock);
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ret = ccw_device_online(cdev);
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spin_unlock_irq(cdev->ccwlock);
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if (ret == 0)
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wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
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else {
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pr_debug("ccw_device_online returned %d, device %s\n",
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ret, cdev->dev.bus_id);
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return ret;
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}
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if (cdev->private->state != DEV_STATE_ONLINE)
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return -ENODEV;
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if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
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cdev->online = 1;
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return 0;
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}
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spin_lock_irq(cdev->ccwlock);
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ret = ccw_device_offline(cdev);
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spin_unlock_irq(cdev->ccwlock);
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if (ret == 0)
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wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
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else
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pr_debug("ccw_device_offline returned %d, device %s\n",
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ret, cdev->dev.bus_id);
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return (ret = 0) ? -ENODEV : ret;
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}
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static ssize_t
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online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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int i, force, ret;
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char *tmp;
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if (atomic_compare_and_swap(0, 1, &cdev->private->onoff))
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return -EAGAIN;
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if (cdev->drv && !try_module_get(cdev->drv->owner)) {
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atomic_set(&cdev->private->onoff, 0);
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return -EINVAL;
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}
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if (!strncmp(buf, "force\n", count)) {
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force = 1;
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i = 1;
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} else {
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force = 0;
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i = simple_strtoul(buf, &tmp, 16);
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}
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if (i == 1) {
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/* Do device recognition, if needed. */
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if (cdev->id.cu_type == 0) {
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ret = ccw_device_recognition(cdev);
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if (ret) {
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printk(KERN_WARNING"Couldn't start recognition "
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"for device %s (ret=%d)\n",
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cdev->dev.bus_id, ret);
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goto out;
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}
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wait_event(cdev->private->wait_q,
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cdev->private->flags.recog_done);
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}
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if (cdev->drv && cdev->drv->set_online)
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ccw_device_set_online(cdev);
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} else if (i == 0) {
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if (cdev->private->state == DEV_STATE_DISCONNECTED)
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ccw_device_remove_disconnected(cdev);
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else if (cdev->drv && cdev->drv->set_offline)
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ccw_device_set_offline(cdev);
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}
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if (force && cdev->private->state == DEV_STATE_BOXED) {
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ret = ccw_device_stlck(cdev);
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if (ret) {
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printk(KERN_WARNING"ccw_device_stlck for device %s "
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"returned %d!\n", cdev->dev.bus_id, ret);
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goto out;
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}
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/* Do device recognition, if needed. */
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if (cdev->id.cu_type == 0) {
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cdev->private->state = DEV_STATE_NOT_OPER;
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ret = ccw_device_recognition(cdev);
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if (ret) {
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printk(KERN_WARNING"Couldn't start recognition "
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"for device %s (ret=%d)\n",
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cdev->dev.bus_id, ret);
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goto out;
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}
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wait_event(cdev->private->wait_q,
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cdev->private->flags.recog_done);
|
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}
|
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if (cdev->drv && cdev->drv->set_online)
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ccw_device_set_online(cdev);
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|
}
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|
out:
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if (cdev->drv)
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module_put(cdev->drv->owner);
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atomic_set(&cdev->private->onoff, 0);
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return count;
|
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}
|
|
|
|
static ssize_t
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available_show (struct device *dev, struct device_attribute *attr, char *buf)
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|
{
|
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struct ccw_device *cdev = to_ccwdev(dev);
|
|
struct subchannel *sch;
|
|
|
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switch (cdev->private->state) {
|
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case DEV_STATE_BOXED:
|
|
return sprintf(buf, "boxed\n");
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|
case DEV_STATE_DISCONNECTED:
|
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case DEV_STATE_DISCONNECTED_SENSE_ID:
|
|
case DEV_STATE_NOT_OPER:
|
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sch = to_subchannel(dev->parent);
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if (!sch->lpm)
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|
return sprintf(buf, "no path\n");
|
|
else
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return sprintf(buf, "no device\n");
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|
default:
|
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/* All other states considered fine. */
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return sprintf(buf, "good\n");
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}
|
|
}
|
|
|
|
static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
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|
static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
|
|
static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
|
|
static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
|
|
static DEVICE_ATTR(online, 0644, online_show, online_store);
|
|
extern struct device_attribute dev_attr_cmb_enable;
|
|
static DEVICE_ATTR(availability, 0444, available_show, NULL);
|
|
|
|
static struct attribute * subch_attrs[] = {
|
|
&dev_attr_chpids.attr,
|
|
&dev_attr_pimpampom.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group subch_attr_group = {
|
|
.attrs = subch_attrs,
|
|
};
|
|
|
|
static inline int
|
|
subchannel_add_files (struct device *dev)
|
|
{
|
|
return sysfs_create_group(&dev->kobj, &subch_attr_group);
|
|
}
|
|
|
|
static struct attribute * ccwdev_attrs[] = {
|
|
&dev_attr_devtype.attr,
|
|
&dev_attr_cutype.attr,
|
|
&dev_attr_online.attr,
|
|
&dev_attr_cmb_enable.attr,
|
|
&dev_attr_availability.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ccwdev_attr_group = {
|
|
.attrs = ccwdev_attrs,
|
|
};
|
|
|
|
static inline int
|
|
device_add_files (struct device *dev)
|
|
{
|
|
return sysfs_create_group(&dev->kobj, &ccwdev_attr_group);
|
|
}
|
|
|
|
static inline void
|
|
device_remove_files(struct device *dev)
|
|
{
|
|
sysfs_remove_group(&dev->kobj, &ccwdev_attr_group);
|
|
}
|
|
|
|
/* this is a simple abstraction for device_register that sets the
|
|
* correct bus type and adds the bus specific files */
|
|
int
|
|
ccw_device_register(struct ccw_device *cdev)
|
|
{
|
|
struct device *dev = &cdev->dev;
|
|
int ret;
|
|
|
|
dev->bus = &ccw_bus_type;
|
|
|
|
if ((ret = device_add(dev)))
|
|
return ret;
|
|
|
|
set_bit(1, &cdev->private->registered);
|
|
if ((ret = device_add_files(dev))) {
|
|
if (test_and_clear_bit(1, &cdev->private->registered))
|
|
device_del(dev);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
struct match_data {
|
|
unsigned int devno;
|
|
struct ccw_device * sibling;
|
|
};
|
|
|
|
static int
|
|
match_devno(struct device * dev, void * data)
|
|
{
|
|
struct match_data * d = (struct match_data *)data;
|
|
struct ccw_device * cdev;
|
|
|
|
cdev = to_ccwdev(dev);
|
|
if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
|
|
(cdev->private->devno == d->devno) &&
|
|
(cdev != d->sibling)) {
|
|
cdev->private->state = DEV_STATE_NOT_OPER;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct ccw_device *
|
|
get_disc_ccwdev_by_devno(unsigned int devno, struct ccw_device *sibling)
|
|
{
|
|
struct device *dev;
|
|
struct match_data data = {
|
|
.devno = devno,
|
|
.sibling = sibling,
|
|
};
|
|
|
|
dev = bus_find_device(&css_bus_type, NULL, &data, match_devno);
|
|
|
|
return dev ? to_ccwdev(dev) : NULL;
|
|
}
|
|
|
|
static void
|
|
ccw_device_add_changed(void *data)
|
|
{
|
|
|
|
struct ccw_device *cdev;
|
|
|
|
cdev = (struct ccw_device *)data;
|
|
if (device_add(&cdev->dev)) {
|
|
put_device(&cdev->dev);
|
|
return;
|
|
}
|
|
set_bit(1, &cdev->private->registered);
|
|
if (device_add_files(&cdev->dev)) {
|
|
if (test_and_clear_bit(1, &cdev->private->registered))
|
|
device_unregister(&cdev->dev);
|
|
}
|
|
}
|
|
|
|
extern int css_get_ssd_info(struct subchannel *sch);
|
|
|
|
void
|
|
ccw_device_do_unreg_rereg(void *data)
|
|
{
|
|
struct ccw_device *cdev;
|
|
struct subchannel *sch;
|
|
int need_rename;
|
|
|
|
cdev = (struct ccw_device *)data;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
if (cdev->private->devno != sch->schib.pmcw.dev) {
|
|
/*
|
|
* The device number has changed. This is usually only when
|
|
* a device has been detached under VM and then re-appeared
|
|
* on another subchannel because of a different attachment
|
|
* order than before. Ideally, we should should just switch
|
|
* subchannels, but unfortunately, this is not possible with
|
|
* the current implementation.
|
|
* Instead, we search for the old subchannel for this device
|
|
* number and deregister so there are no collisions with the
|
|
* newly registered ccw_device.
|
|
* FIXME: Find another solution so the block layer doesn't
|
|
* get possibly sick...
|
|
*/
|
|
struct ccw_device *other_cdev;
|
|
|
|
need_rename = 1;
|
|
other_cdev = get_disc_ccwdev_by_devno(sch->schib.pmcw.dev,
|
|
cdev);
|
|
if (other_cdev) {
|
|
struct subchannel *other_sch;
|
|
|
|
other_sch = to_subchannel(other_cdev->dev.parent);
|
|
if (get_device(&other_sch->dev)) {
|
|
stsch(other_sch->irq, &other_sch->schib);
|
|
if (other_sch->schib.pmcw.dnv) {
|
|
other_sch->schib.pmcw.intparm = 0;
|
|
cio_modify(other_sch);
|
|
}
|
|
device_unregister(&other_sch->dev);
|
|
}
|
|
}
|
|
/* Update ssd info here. */
|
|
css_get_ssd_info(sch);
|
|
cdev->private->devno = sch->schib.pmcw.dev;
|
|
} else
|
|
need_rename = 0;
|
|
device_remove_files(&cdev->dev);
|
|
if (test_and_clear_bit(1, &cdev->private->registered))
|
|
device_del(&cdev->dev);
|
|
if (need_rename)
|
|
snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x",
|
|
sch->schib.pmcw.dev);
|
|
PREPARE_WORK(&cdev->private->kick_work,
|
|
ccw_device_add_changed, (void *)cdev);
|
|
queue_work(ccw_device_work, &cdev->private->kick_work);
|
|
}
|
|
|
|
static void
|
|
ccw_device_release(struct device *dev)
|
|
{
|
|
struct ccw_device *cdev;
|
|
|
|
cdev = to_ccwdev(dev);
|
|
kfree(cdev->private);
|
|
kfree(cdev);
|
|
}
|
|
|
|
/*
|
|
* Register recognized device.
|
|
*/
|
|
static void
|
|
io_subchannel_register(void *data)
|
|
{
|
|
struct ccw_device *cdev;
|
|
struct subchannel *sch;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
cdev = (struct ccw_device *) data;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
|
|
if (klist_node_attached(&cdev->dev.knode_parent)) {
|
|
bus_rescan_devices(&ccw_bus_type);
|
|
goto out;
|
|
}
|
|
/* make it known to the system */
|
|
ret = ccw_device_register(cdev);
|
|
if (ret) {
|
|
printk (KERN_WARNING "%s: could not register %s\n",
|
|
__func__, cdev->dev.bus_id);
|
|
put_device(&cdev->dev);
|
|
spin_lock_irqsave(&sch->lock, flags);
|
|
sch->dev.driver_data = NULL;
|
|
spin_unlock_irqrestore(&sch->lock, flags);
|
|
kfree (cdev->private);
|
|
kfree (cdev);
|
|
put_device(&sch->dev);
|
|
if (atomic_dec_and_test(&ccw_device_init_count))
|
|
wake_up(&ccw_device_init_wq);
|
|
return;
|
|
}
|
|
|
|
ret = subchannel_add_files(cdev->dev.parent);
|
|
if (ret)
|
|
printk(KERN_WARNING "%s: could not add attributes to %s\n",
|
|
__func__, sch->dev.bus_id);
|
|
put_device(&cdev->dev);
|
|
out:
|
|
cdev->private->flags.recog_done = 1;
|
|
put_device(&sch->dev);
|
|
wake_up(&cdev->private->wait_q);
|
|
if (atomic_dec_and_test(&ccw_device_init_count))
|
|
wake_up(&ccw_device_init_wq);
|
|
}
|
|
|
|
void
|
|
ccw_device_call_sch_unregister(void *data)
|
|
{
|
|
struct ccw_device *cdev = data;
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
device_unregister(&sch->dev);
|
|
/* Reset intparm to zeroes. */
|
|
sch->schib.pmcw.intparm = 0;
|
|
cio_modify(sch);
|
|
put_device(&cdev->dev);
|
|
put_device(&sch->dev);
|
|
}
|
|
|
|
/*
|
|
* subchannel recognition done. Called from the state machine.
|
|
*/
|
|
void
|
|
io_subchannel_recog_done(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
if (css_init_done == 0) {
|
|
cdev->private->flags.recog_done = 1;
|
|
return;
|
|
}
|
|
switch (cdev->private->state) {
|
|
case DEV_STATE_NOT_OPER:
|
|
cdev->private->flags.recog_done = 1;
|
|
/* Remove device found not operational. */
|
|
if (!get_device(&cdev->dev))
|
|
break;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
PREPARE_WORK(&cdev->private->kick_work,
|
|
ccw_device_call_sch_unregister, (void *) cdev);
|
|
queue_work(slow_path_wq, &cdev->private->kick_work);
|
|
if (atomic_dec_and_test(&ccw_device_init_count))
|
|
wake_up(&ccw_device_init_wq);
|
|
break;
|
|
case DEV_STATE_BOXED:
|
|
/* Device did not respond in time. */
|
|
case DEV_STATE_OFFLINE:
|
|
/*
|
|
* We can't register the device in interrupt context so
|
|
* we schedule a work item.
|
|
*/
|
|
if (!get_device(&cdev->dev))
|
|
break;
|
|
PREPARE_WORK(&cdev->private->kick_work,
|
|
io_subchannel_register, (void *) cdev);
|
|
queue_work(slow_path_wq, &cdev->private->kick_work);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int
|
|
io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
|
|
{
|
|
int rc;
|
|
struct ccw_device_private *priv;
|
|
|
|
sch->dev.driver_data = cdev;
|
|
sch->driver = &io_subchannel_driver;
|
|
cdev->ccwlock = &sch->lock;
|
|
/* Init private data. */
|
|
priv = cdev->private;
|
|
priv->devno = sch->schib.pmcw.dev;
|
|
priv->irq = sch->irq;
|
|
priv->state = DEV_STATE_NOT_OPER;
|
|
INIT_LIST_HEAD(&priv->cmb_list);
|
|
init_waitqueue_head(&priv->wait_q);
|
|
init_timer(&priv->timer);
|
|
|
|
/* Set an initial name for the device. */
|
|
snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x",
|
|
sch->schib.pmcw.dev);
|
|
|
|
/* Increase counter of devices currently in recognition. */
|
|
atomic_inc(&ccw_device_init_count);
|
|
|
|
/* Start async. device sensing. */
|
|
spin_lock_irq(&sch->lock);
|
|
rc = ccw_device_recognition(cdev);
|
|
spin_unlock_irq(&sch->lock);
|
|
if (rc) {
|
|
if (atomic_dec_and_test(&ccw_device_init_count))
|
|
wake_up(&ccw_device_init_wq);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
io_subchannel_probe (struct device *pdev)
|
|
{
|
|
struct subchannel *sch;
|
|
struct ccw_device *cdev;
|
|
int rc;
|
|
unsigned long flags;
|
|
|
|
sch = to_subchannel(pdev);
|
|
if (sch->dev.driver_data) {
|
|
/*
|
|
* This subchannel already has an associated ccw_device.
|
|
* Register it and exit. This happens for all early
|
|
* device, e.g. the console.
|
|
*/
|
|
cdev = sch->dev.driver_data;
|
|
device_initialize(&cdev->dev);
|
|
ccw_device_register(cdev);
|
|
subchannel_add_files(&sch->dev);
|
|
/*
|
|
* Check if the device is already online. If it is
|
|
* the reference count needs to be corrected
|
|
* (see ccw_device_online and css_init_done for the
|
|
* ugly details).
|
|
*/
|
|
if (cdev->private->state != DEV_STATE_NOT_OPER &&
|
|
cdev->private->state != DEV_STATE_OFFLINE &&
|
|
cdev->private->state != DEV_STATE_BOXED)
|
|
get_device(&cdev->dev);
|
|
return 0;
|
|
}
|
|
cdev = kmalloc (sizeof(*cdev), GFP_KERNEL);
|
|
if (!cdev)
|
|
return -ENOMEM;
|
|
memset(cdev, 0, sizeof(struct ccw_device));
|
|
cdev->private = kmalloc(sizeof(struct ccw_device_private),
|
|
GFP_KERNEL | GFP_DMA);
|
|
if (!cdev->private) {
|
|
kfree(cdev);
|
|
return -ENOMEM;
|
|
}
|
|
memset(cdev->private, 0, sizeof(struct ccw_device_private));
|
|
atomic_set(&cdev->private->onoff, 0);
|
|
cdev->dev = (struct device) {
|
|
.parent = pdev,
|
|
.release = ccw_device_release,
|
|
};
|
|
INIT_LIST_HEAD(&cdev->private->kick_work.entry);
|
|
/* Do first half of device_register. */
|
|
device_initialize(&cdev->dev);
|
|
|
|
if (!get_device(&sch->dev)) {
|
|
if (cdev->dev.release)
|
|
cdev->dev.release(&cdev->dev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
rc = io_subchannel_recog(cdev, to_subchannel(pdev));
|
|
if (rc) {
|
|
spin_lock_irqsave(&sch->lock, flags);
|
|
sch->dev.driver_data = NULL;
|
|
spin_unlock_irqrestore(&sch->lock, flags);
|
|
if (cdev->dev.release)
|
|
cdev->dev.release(&cdev->dev);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
ccw_device_unregister(void *data)
|
|
{
|
|
struct ccw_device *cdev;
|
|
|
|
cdev = (struct ccw_device *)data;
|
|
if (test_and_clear_bit(1, &cdev->private->registered))
|
|
device_unregister(&cdev->dev);
|
|
put_device(&cdev->dev);
|
|
}
|
|
|
|
static int
|
|
io_subchannel_remove (struct device *dev)
|
|
{
|
|
struct ccw_device *cdev;
|
|
unsigned long flags;
|
|
|
|
if (!dev->driver_data)
|
|
return 0;
|
|
cdev = dev->driver_data;
|
|
/* Set ccw device to not operational and drop reference. */
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
dev->driver_data = NULL;
|
|
cdev->private->state = DEV_STATE_NOT_OPER;
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
/*
|
|
* Put unregistration on workqueue to avoid livelocks on the css bus
|
|
* semaphore.
|
|
*/
|
|
if (get_device(&cdev->dev)) {
|
|
PREPARE_WORK(&cdev->private->kick_work,
|
|
ccw_device_unregister, (void *) cdev);
|
|
queue_work(ccw_device_work, &cdev->private->kick_work);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
io_subchannel_notify(struct device *dev, int event)
|
|
{
|
|
struct ccw_device *cdev;
|
|
|
|
cdev = dev->driver_data;
|
|
if (!cdev)
|
|
return 0;
|
|
if (!cdev->drv)
|
|
return 0;
|
|
if (!cdev->online)
|
|
return 0;
|
|
return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
|
|
}
|
|
|
|
static void
|
|
io_subchannel_verify(struct device *dev)
|
|
{
|
|
struct ccw_device *cdev;
|
|
|
|
cdev = dev->driver_data;
|
|
if (cdev)
|
|
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
|
|
}
|
|
|
|
static void
|
|
io_subchannel_ioterm(struct device *dev)
|
|
{
|
|
struct ccw_device *cdev;
|
|
|
|
cdev = dev->driver_data;
|
|
if (!cdev)
|
|
return;
|
|
cdev->private->state = DEV_STATE_CLEAR_VERIFY;
|
|
if (cdev->handler)
|
|
cdev->handler(cdev, cdev->private->intparm,
|
|
ERR_PTR(-EIO));
|
|
}
|
|
|
|
static void
|
|
io_subchannel_shutdown(struct device *dev)
|
|
{
|
|
struct subchannel *sch;
|
|
struct ccw_device *cdev;
|
|
int ret;
|
|
|
|
sch = to_subchannel(dev);
|
|
cdev = dev->driver_data;
|
|
|
|
if (cio_is_console(sch->irq))
|
|
return;
|
|
if (!sch->schib.pmcw.ena)
|
|
/* Nothing to do. */
|
|
return;
|
|
ret = cio_disable_subchannel(sch);
|
|
if (ret != -EBUSY)
|
|
/* Subchannel is disabled, we're done. */
|
|
return;
|
|
cdev->private->state = DEV_STATE_QUIESCE;
|
|
if (cdev->handler)
|
|
cdev->handler(cdev, cdev->private->intparm,
|
|
ERR_PTR(-EIO));
|
|
ret = ccw_device_cancel_halt_clear(cdev);
|
|
if (ret == -EBUSY) {
|
|
ccw_device_set_timeout(cdev, HZ/10);
|
|
wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
|
|
}
|
|
cio_disable_subchannel(sch);
|
|
}
|
|
|
|
#ifdef CONFIG_CCW_CONSOLE
|
|
static struct ccw_device console_cdev;
|
|
static struct ccw_device_private console_private;
|
|
static int console_cdev_in_use;
|
|
|
|
static int
|
|
ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
|
|
{
|
|
int rc;
|
|
|
|
/* Initialize the ccw_device structure. */
|
|
cdev->dev = (struct device) {
|
|
.parent = &sch->dev,
|
|
};
|
|
/* Initialize the subchannel structure */
|
|
sch->dev.parent = &css_bus_device;
|
|
sch->dev.bus = &css_bus_type;
|
|
|
|
rc = io_subchannel_recog(cdev, sch);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Now wait for the async. recognition to come to an end. */
|
|
spin_lock_irq(cdev->ccwlock);
|
|
while (!dev_fsm_final_state(cdev))
|
|
wait_cons_dev();
|
|
rc = -EIO;
|
|
if (cdev->private->state != DEV_STATE_OFFLINE)
|
|
goto out_unlock;
|
|
ccw_device_online(cdev);
|
|
while (!dev_fsm_final_state(cdev))
|
|
wait_cons_dev();
|
|
if (cdev->private->state != DEV_STATE_ONLINE)
|
|
goto out_unlock;
|
|
rc = 0;
|
|
out_unlock:
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
return 0;
|
|
}
|
|
|
|
struct ccw_device *
|
|
ccw_device_probe_console(void)
|
|
{
|
|
struct subchannel *sch;
|
|
int ret;
|
|
|
|
if (xchg(&console_cdev_in_use, 1) != 0)
|
|
return NULL;
|
|
sch = cio_probe_console();
|
|
if (IS_ERR(sch)) {
|
|
console_cdev_in_use = 0;
|
|
return (void *) sch;
|
|
}
|
|
memset(&console_cdev, 0, sizeof(struct ccw_device));
|
|
memset(&console_private, 0, sizeof(struct ccw_device_private));
|
|
console_cdev.private = &console_private;
|
|
ret = ccw_device_console_enable(&console_cdev, sch);
|
|
if (ret) {
|
|
cio_release_console();
|
|
console_cdev_in_use = 0;
|
|
return ERR_PTR(ret);
|
|
}
|
|
console_cdev.online = 1;
|
|
return &console_cdev;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* get ccw_device matching the busid, but only if owned by cdrv
|
|
*/
|
|
static int
|
|
__ccwdev_check_busid(struct device *dev, void *id)
|
|
{
|
|
char *bus_id;
|
|
|
|
bus_id = (char *)id;
|
|
|
|
return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0);
|
|
}
|
|
|
|
|
|
struct ccw_device *
|
|
get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
|
|
{
|
|
struct device *dev;
|
|
struct device_driver *drv;
|
|
|
|
drv = get_driver(&cdrv->driver);
|
|
if (!drv)
|
|
return NULL;
|
|
|
|
dev = driver_find_device(drv, NULL, (void *)bus_id,
|
|
__ccwdev_check_busid);
|
|
put_driver(drv);
|
|
|
|
return dev ? to_ccwdev(dev) : 0;
|
|
}
|
|
|
|
/************************** device driver handling ************************/
|
|
|
|
/* This is the implementation of the ccw_driver class. The probe, remove
|
|
* and release methods are initially very similar to the device_driver
|
|
* implementations, with the difference that they have ccw_device
|
|
* arguments.
|
|
*
|
|
* A ccw driver also contains the information that is needed for
|
|
* device matching.
|
|
*/
|
|
static int
|
|
ccw_device_probe (struct device *dev)
|
|
{
|
|
struct ccw_device *cdev = to_ccwdev(dev);
|
|
struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
|
|
int ret;
|
|
|
|
cdev->drv = cdrv; /* to let the driver call _set_online */
|
|
|
|
ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
|
|
|
|
if (ret) {
|
|
cdev->drv = 0;
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ccw_device_remove (struct device *dev)
|
|
{
|
|
struct ccw_device *cdev = to_ccwdev(dev);
|
|
struct ccw_driver *cdrv = cdev->drv;
|
|
int ret;
|
|
|
|
pr_debug("removing device %s\n", cdev->dev.bus_id);
|
|
if (cdrv->remove)
|
|
cdrv->remove(cdev);
|
|
if (cdev->online) {
|
|
cdev->online = 0;
|
|
spin_lock_irq(cdev->ccwlock);
|
|
ret = ccw_device_offline(cdev);
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
if (ret == 0)
|
|
wait_event(cdev->private->wait_q,
|
|
dev_fsm_final_state(cdev));
|
|
else
|
|
//FIXME: we can't fail!
|
|
pr_debug("ccw_device_offline returned %d, device %s\n",
|
|
ret, cdev->dev.bus_id);
|
|
}
|
|
ccw_device_set_timeout(cdev, 0);
|
|
cdev->drv = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ccw_driver_register (struct ccw_driver *cdriver)
|
|
{
|
|
struct device_driver *drv = &cdriver->driver;
|
|
|
|
drv->bus = &ccw_bus_type;
|
|
drv->name = cdriver->name;
|
|
drv->probe = ccw_device_probe;
|
|
drv->remove = ccw_device_remove;
|
|
|
|
return driver_register(drv);
|
|
}
|
|
|
|
void
|
|
ccw_driver_unregister (struct ccw_driver *cdriver)
|
|
{
|
|
driver_unregister(&cdriver->driver);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
EXPORT_SYMBOL(ccw_device_set_online);
|
|
EXPORT_SYMBOL(ccw_device_set_offline);
|
|
EXPORT_SYMBOL(ccw_driver_register);
|
|
EXPORT_SYMBOL(ccw_driver_unregister);
|
|
EXPORT_SYMBOL(get_ccwdev_by_busid);
|
|
EXPORT_SYMBOL(ccw_bus_type);
|
|
EXPORT_SYMBOL(ccw_device_work);
|
|
EXPORT_SYMBOL(ccw_device_notify_work);
|