![Cornelia Huck](/assets/img/avatar_default.png)
Convert the subchannel lock to a pointer to a lock. Needed for the dynamic subchannel mapping patch. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
768 lines
17 KiB
C
768 lines
17 KiB
C
/*
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* drivers/s390/cio/css.c
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* driver for channel subsystem
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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 (cornelia.huck@de.ibm.com)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include "css.h"
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#include "cio.h"
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#include "cio_debug.h"
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#include "ioasm.h"
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#include "chsc.h"
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#include "device.h"
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int need_rescan = 0;
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int css_init_done = 0;
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static int need_reprobe = 0;
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static int max_ssid = 0;
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struct channel_subsystem *css[__MAX_CSSID + 1];
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int css_characteristics_avail = 0;
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inline int
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for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
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{
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struct subchannel_id schid;
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int ret;
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init_subchannel_id(&schid);
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ret = -ENODEV;
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do {
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do {
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ret = fn(schid, data);
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if (ret)
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break;
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} while (schid.sch_no++ < __MAX_SUBCHANNEL);
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schid.sch_no = 0;
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} while (schid.ssid++ < max_ssid);
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return ret;
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}
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static struct subchannel *
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css_alloc_subchannel(struct subchannel_id schid)
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{
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struct subchannel *sch;
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int ret;
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sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA);
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if (sch == NULL)
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return ERR_PTR(-ENOMEM);
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ret = cio_validate_subchannel (sch, schid);
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if (ret < 0) {
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kfree(sch);
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return ERR_PTR(ret);
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}
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if (sch->st != SUBCHANNEL_TYPE_IO) {
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/* For now we ignore all non-io subchannels. */
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kfree(sch);
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return ERR_PTR(-EINVAL);
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}
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/*
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* Set intparm to subchannel address.
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* This is fine even on 64bit since the subchannel is always located
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* under 2G.
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*/
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sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
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ret = cio_modify(sch);
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if (ret) {
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kfree(sch);
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return ERR_PTR(ret);
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}
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return sch;
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}
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static void
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css_free_subchannel(struct subchannel *sch)
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{
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if (sch) {
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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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kfree(sch->lock);
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kfree(sch);
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}
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}
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static void
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css_subchannel_release(struct device *dev)
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{
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struct subchannel *sch;
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sch = to_subchannel(dev);
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if (!cio_is_console(sch->schid)) {
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kfree(sch->lock);
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kfree(sch);
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}
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}
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extern int css_get_ssd_info(struct subchannel *sch);
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int css_sch_device_register(struct subchannel *sch)
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{
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int ret;
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mutex_lock(&sch->reg_mutex);
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ret = device_register(&sch->dev);
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mutex_unlock(&sch->reg_mutex);
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return ret;
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}
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void css_sch_device_unregister(struct subchannel *sch)
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{
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mutex_lock(&sch->reg_mutex);
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device_unregister(&sch->dev);
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mutex_unlock(&sch->reg_mutex);
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}
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static int
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css_register_subchannel(struct subchannel *sch)
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{
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int ret;
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/* Initialize the subchannel structure */
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sch->dev.parent = &css[0]->device;
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sch->dev.bus = &css_bus_type;
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sch->dev.release = &css_subchannel_release;
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/* make it known to the system */
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ret = css_sch_device_register(sch);
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if (ret) {
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printk (KERN_WARNING "%s: could not register %s\n",
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__func__, sch->dev.bus_id);
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return ret;
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}
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css_get_ssd_info(sch);
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ret = subchannel_add_files(&sch->dev);
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if (ret)
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printk(KERN_WARNING "%s: could not add attributes to %s\n",
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__func__, sch->dev.bus_id);
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return ret;
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}
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int
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css_probe_device(struct subchannel_id schid)
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{
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int ret;
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struct subchannel *sch;
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sch = css_alloc_subchannel(schid);
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if (IS_ERR(sch))
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return PTR_ERR(sch);
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ret = css_register_subchannel(sch);
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if (ret)
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css_free_subchannel(sch);
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return ret;
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}
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static int
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check_subchannel(struct device * dev, void * data)
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{
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struct subchannel *sch;
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struct subchannel_id *schid = data;
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sch = to_subchannel(dev);
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return schid_equal(&sch->schid, schid);
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}
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struct subchannel *
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get_subchannel_by_schid(struct subchannel_id schid)
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{
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struct device *dev;
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dev = bus_find_device(&css_bus_type, NULL,
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&schid, check_subchannel);
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return dev ? to_subchannel(dev) : NULL;
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}
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static inline int css_get_subchannel_status(struct subchannel *sch)
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{
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struct schib schib;
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if (stsch(sch->schid, &schib) || !schib.pmcw.dnv)
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return CIO_GONE;
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if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev))
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return CIO_REVALIDATE;
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if (!sch->lpm)
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return CIO_NO_PATH;
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return CIO_OPER;
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}
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static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
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{
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int event, ret, disc;
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unsigned long flags;
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enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action;
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spin_lock_irqsave(sch->lock, flags);
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disc = device_is_disconnected(sch);
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if (disc && slow) {
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/* Disconnected devices are evaluated directly only.*/
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spin_unlock_irqrestore(sch->lock, flags);
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return 0;
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}
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/* No interrupt after machine check - kill pending timers. */
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device_kill_pending_timer(sch);
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if (!disc && !slow) {
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/* Non-disconnected devices are evaluated on the slow path. */
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spin_unlock_irqrestore(sch->lock, flags);
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return -EAGAIN;
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}
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event = css_get_subchannel_status(sch);
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CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
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sch->schid.ssid, sch->schid.sch_no, event,
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disc ? "disconnected" : "normal",
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slow ? "slow" : "fast");
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/* Analyze subchannel status. */
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action = NONE;
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switch (event) {
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case CIO_NO_PATH:
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if (disc) {
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/* Check if paths have become available. */
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action = REPROBE;
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break;
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}
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/* fall through */
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case CIO_GONE:
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/* Prevent unwanted effects when opening lock. */
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cio_disable_subchannel(sch);
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device_set_disconnected(sch);
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/* Ask driver what to do with device. */
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action = UNREGISTER;
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if (sch->driver && sch->driver->notify) {
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spin_unlock_irqrestore(sch->lock, flags);
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ret = sch->driver->notify(&sch->dev, event);
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spin_lock_irqsave(sch->lock, flags);
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if (ret)
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action = NONE;
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}
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break;
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case CIO_REVALIDATE:
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/* Device will be removed, so no notify necessary. */
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if (disc)
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/* Reprobe because immediate unregister might block. */
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action = REPROBE;
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else
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action = UNREGISTER_PROBE;
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break;
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case CIO_OPER:
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if (disc)
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/* Get device operational again. */
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action = REPROBE;
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break;
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}
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/* Perform action. */
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ret = 0;
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switch (action) {
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case UNREGISTER:
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case UNREGISTER_PROBE:
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/* Unregister device (will use subchannel lock). */
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spin_unlock_irqrestore(sch->lock, flags);
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css_sch_device_unregister(sch);
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spin_lock_irqsave(sch->lock, flags);
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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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break;
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case REPROBE:
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device_trigger_reprobe(sch);
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break;
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default:
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break;
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}
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spin_unlock_irqrestore(sch->lock, flags);
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/* Probe if necessary. */
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if (action == UNREGISTER_PROBE)
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ret = css_probe_device(sch->schid);
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return ret;
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}
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static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
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{
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struct schib schib;
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if (!slow) {
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/* Will be done on the slow path. */
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return -EAGAIN;
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}
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if (stsch(schid, &schib) || !schib.pmcw.dnv) {
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/* Unusable - ignore. */
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return 0;
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}
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CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, "
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"slow path.\n", schid.ssid, schid.sch_no, CIO_OPER);
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return css_probe_device(schid);
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}
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static int css_evaluate_subchannel(struct subchannel_id schid, int slow)
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{
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struct subchannel *sch;
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int ret;
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sch = get_subchannel_by_schid(schid);
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if (sch) {
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ret = css_evaluate_known_subchannel(sch, slow);
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put_device(&sch->dev);
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} else
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ret = css_evaluate_new_subchannel(schid, slow);
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return ret;
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}
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static int
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css_rescan_devices(struct subchannel_id schid, void *data)
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{
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return css_evaluate_subchannel(schid, 1);
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}
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struct slow_subchannel {
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struct list_head slow_list;
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struct subchannel_id schid;
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};
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static LIST_HEAD(slow_subchannels_head);
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static DEFINE_SPINLOCK(slow_subchannel_lock);
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static void
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css_trigger_slow_path(struct work_struct *unused)
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{
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CIO_TRACE_EVENT(4, "slowpath");
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if (need_rescan) {
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need_rescan = 0;
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for_each_subchannel(css_rescan_devices, NULL);
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return;
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}
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spin_lock_irq(&slow_subchannel_lock);
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while (!list_empty(&slow_subchannels_head)) {
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struct slow_subchannel *slow_sch =
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list_entry(slow_subchannels_head.next,
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struct slow_subchannel, slow_list);
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list_del_init(slow_subchannels_head.next);
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spin_unlock_irq(&slow_subchannel_lock);
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css_evaluate_subchannel(slow_sch->schid, 1);
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spin_lock_irq(&slow_subchannel_lock);
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kfree(slow_sch);
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}
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spin_unlock_irq(&slow_subchannel_lock);
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}
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DECLARE_WORK(slow_path_work, css_trigger_slow_path);
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struct workqueue_struct *slow_path_wq;
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/* Reprobe subchannel if unregistered. */
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static int reprobe_subchannel(struct subchannel_id schid, void *data)
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{
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struct subchannel *sch;
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int ret;
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CIO_DEBUG(KERN_INFO, 6, "cio: reprobe 0.%x.%04x\n",
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schid.ssid, schid.sch_no);
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if (need_reprobe)
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return -EAGAIN;
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sch = get_subchannel_by_schid(schid);
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if (sch) {
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/* Already known. */
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put_device(&sch->dev);
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return 0;
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}
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ret = css_probe_device(schid);
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switch (ret) {
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case 0:
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break;
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case -ENXIO:
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case -ENOMEM:
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/* These should abort looping */
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break;
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default:
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ret = 0;
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}
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return ret;
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}
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/* Work function used to reprobe all unregistered subchannels. */
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static void reprobe_all(struct work_struct *unused)
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{
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int ret;
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CIO_MSG_EVENT(2, "reprobe start\n");
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need_reprobe = 0;
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/* Make sure initial subchannel scan is done. */
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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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ret = for_each_subchannel(reprobe_subchannel, NULL);
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CIO_MSG_EVENT(2, "reprobe done (rc=%d, need_reprobe=%d)\n", ret,
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need_reprobe);
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}
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DECLARE_WORK(css_reprobe_work, reprobe_all);
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/* Schedule reprobing of all unregistered subchannels. */
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void css_schedule_reprobe(void)
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{
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need_reprobe = 1;
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queue_work(ccw_device_work, &css_reprobe_work);
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}
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EXPORT_SYMBOL_GPL(css_schedule_reprobe);
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/*
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* Rescan for new devices. FIXME: This is slow.
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* This function is called when we have lost CRWs due to overflows and we have
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* to do subchannel housekeeping.
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*/
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void
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css_reiterate_subchannels(void)
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{
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css_clear_subchannel_slow_list();
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need_rescan = 1;
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}
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/*
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* Called from the machine check handler for subchannel report words.
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*/
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int
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css_process_crw(int rsid1, int rsid2)
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{
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int ret;
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struct subchannel_id mchk_schid;
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CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n",
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rsid1, rsid2);
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if (need_rescan)
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/* We need to iterate all subchannels anyway. */
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return -EAGAIN;
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init_subchannel_id(&mchk_schid);
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mchk_schid.sch_no = rsid1;
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if (rsid2 != 0)
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mchk_schid.ssid = (rsid2 >> 8) & 3;
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/*
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* Since we are always presented with IPI in the CRW, we have to
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* use stsch() to find out if the subchannel in question has come
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* or gone.
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*/
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ret = css_evaluate_subchannel(mchk_schid, 0);
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if (ret == -EAGAIN) {
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if (css_enqueue_subchannel_slow(mchk_schid)) {
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css_clear_subchannel_slow_list();
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need_rescan = 1;
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}
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}
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return ret;
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}
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static int __init
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__init_channel_subsystem(struct subchannel_id schid, void *data)
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{
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struct subchannel *sch;
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int ret;
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if (cio_is_console(schid))
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sch = cio_get_console_subchannel();
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else {
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sch = css_alloc_subchannel(schid);
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if (IS_ERR(sch))
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ret = PTR_ERR(sch);
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else
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ret = 0;
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switch (ret) {
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case 0:
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break;
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case -ENOMEM:
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panic("Out of memory in init_channel_subsystem\n");
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/* -ENXIO: no more subchannels. */
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case -ENXIO:
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return ret;
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/* -EIO: this subchannel set not supported. */
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case -EIO:
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return ret;
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default:
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return 0;
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}
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}
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/*
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* We register ALL valid subchannels in ioinfo, even those
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* that have been present before init_channel_subsystem.
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* These subchannels can't have been registered yet (kmalloc
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* not working) so we do it now. This is true e.g. for the
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* console subchannel.
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*/
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css_register_subchannel(sch);
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return 0;
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}
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static void __init
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css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
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{
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if (css_characteristics_avail && css_general_characteristics.mcss) {
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css->global_pgid.pgid_high.ext_cssid.version = 0x80;
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css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
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} else {
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#ifdef CONFIG_SMP
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css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id();
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#else
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css->global_pgid.pgid_high.cpu_addr = 0;
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#endif
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}
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css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
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css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
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css->global_pgid.tod_high = tod_high;
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}
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static void
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channel_subsystem_release(struct device *dev)
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{
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struct channel_subsystem *css;
|
|
|
|
css = to_css(dev);
|
|
mutex_destroy(&css->mutex);
|
|
kfree(css);
|
|
}
|
|
|
|
static ssize_t
|
|
css_cm_enable_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct channel_subsystem *css = to_css(dev);
|
|
|
|
if (!css)
|
|
return 0;
|
|
return sprintf(buf, "%x\n", css->cm_enabled);
|
|
}
|
|
|
|
static ssize_t
|
|
css_cm_enable_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct channel_subsystem *css = to_css(dev);
|
|
int ret;
|
|
|
|
switch (buf[0]) {
|
|
case '0':
|
|
ret = css->cm_enabled ? chsc_secm(css, 0) : 0;
|
|
break;
|
|
case '1':
|
|
ret = css->cm_enabled ? 0 : chsc_secm(css, 1);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store);
|
|
|
|
static inline void __init
|
|
setup_css(int nr)
|
|
{
|
|
u32 tod_high;
|
|
|
|
memset(css[nr], 0, sizeof(struct channel_subsystem));
|
|
mutex_init(&css[nr]->mutex);
|
|
css[nr]->valid = 1;
|
|
css[nr]->cssid = nr;
|
|
sprintf(css[nr]->device.bus_id, "css%x", nr);
|
|
css[nr]->device.release = channel_subsystem_release;
|
|
tod_high = (u32) (get_clock() >> 32);
|
|
css_generate_pgid(css[nr], tod_high);
|
|
}
|
|
|
|
/*
|
|
* Now that the driver core is running, we can setup our channel subsystem.
|
|
* The struct subchannel's are created during probing (except for the
|
|
* static console subchannel).
|
|
*/
|
|
static int __init
|
|
init_channel_subsystem (void)
|
|
{
|
|
int ret, i;
|
|
|
|
if (chsc_determine_css_characteristics() == 0)
|
|
css_characteristics_avail = 1;
|
|
|
|
if ((ret = bus_register(&css_bus_type)))
|
|
goto out;
|
|
|
|
/* Try to enable MSS. */
|
|
ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
|
|
switch (ret) {
|
|
case 0: /* Success. */
|
|
max_ssid = __MAX_SSID;
|
|
break;
|
|
case -ENOMEM:
|
|
goto out_bus;
|
|
default:
|
|
max_ssid = 0;
|
|
}
|
|
/* Setup css structure. */
|
|
for (i = 0; i <= __MAX_CSSID; i++) {
|
|
css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL);
|
|
if (!css[i]) {
|
|
ret = -ENOMEM;
|
|
goto out_unregister;
|
|
}
|
|
setup_css(i);
|
|
ret = device_register(&css[i]->device);
|
|
if (ret)
|
|
goto out_free;
|
|
if (css_characteristics_avail &&
|
|
css_chsc_characteristics.secm) {
|
|
ret = device_create_file(&css[i]->device,
|
|
&dev_attr_cm_enable);
|
|
if (ret)
|
|
goto out_device;
|
|
}
|
|
}
|
|
css_init_done = 1;
|
|
|
|
ctl_set_bit(6, 28);
|
|
|
|
for_each_subchannel(__init_channel_subsystem, NULL);
|
|
return 0;
|
|
out_device:
|
|
device_unregister(&css[i]->device);
|
|
out_free:
|
|
kfree(css[i]);
|
|
out_unregister:
|
|
while (i > 0) {
|
|
i--;
|
|
if (css_characteristics_avail && css_chsc_characteristics.secm)
|
|
device_remove_file(&css[i]->device,
|
|
&dev_attr_cm_enable);
|
|
device_unregister(&css[i]->device);
|
|
}
|
|
out_bus:
|
|
bus_unregister(&css_bus_type);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* find a driver for a subchannel. They identify by the subchannel
|
|
* type with the exception that the console subchannel driver has its own
|
|
* subchannel type although the device is an i/o subchannel
|
|
*/
|
|
static int
|
|
css_bus_match (struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct subchannel *sch = container_of (dev, struct subchannel, dev);
|
|
struct css_driver *driver = container_of (drv, struct css_driver, drv);
|
|
|
|
if (sch->st == driver->subchannel_type)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
css_probe (struct device *dev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(dev);
|
|
sch->driver = container_of (dev->driver, struct css_driver, drv);
|
|
return (sch->driver->probe ? sch->driver->probe(sch) : 0);
|
|
}
|
|
|
|
static int
|
|
css_remove (struct device *dev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(dev);
|
|
return (sch->driver->remove ? sch->driver->remove(sch) : 0);
|
|
}
|
|
|
|
static void
|
|
css_shutdown (struct device *dev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(dev);
|
|
if (sch->driver->shutdown)
|
|
sch->driver->shutdown(sch);
|
|
}
|
|
|
|
struct bus_type css_bus_type = {
|
|
.name = "css",
|
|
.match = css_bus_match,
|
|
.probe = css_probe,
|
|
.remove = css_remove,
|
|
.shutdown = css_shutdown,
|
|
};
|
|
|
|
subsys_initcall(init_channel_subsystem);
|
|
|
|
int
|
|
css_enqueue_subchannel_slow(struct subchannel_id schid)
|
|
{
|
|
struct slow_subchannel *new_slow_sch;
|
|
unsigned long flags;
|
|
|
|
new_slow_sch = kzalloc(sizeof(struct slow_subchannel), GFP_ATOMIC);
|
|
if (!new_slow_sch)
|
|
return -ENOMEM;
|
|
new_slow_sch->schid = schid;
|
|
spin_lock_irqsave(&slow_subchannel_lock, flags);
|
|
list_add_tail(&new_slow_sch->slow_list, &slow_subchannels_head);
|
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
css_clear_subchannel_slow_list(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&slow_subchannel_lock, flags);
|
|
while (!list_empty(&slow_subchannels_head)) {
|
|
struct slow_subchannel *slow_sch =
|
|
list_entry(slow_subchannels_head.next,
|
|
struct slow_subchannel, slow_list);
|
|
|
|
list_del_init(slow_subchannels_head.next);
|
|
kfree(slow_sch);
|
|
}
|
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
|
|
}
|
|
|
|
|
|
|
|
int
|
|
css_slow_subchannels_exist(void)
|
|
{
|
|
return (!list_empty(&slow_subchannels_head));
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
EXPORT_SYMBOL(css_bus_type);
|
|
EXPORT_SYMBOL_GPL(css_characteristics_avail);
|