1027 lines
23 KiB
C
1027 lines
23 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 IBM Corp. 2002,2008
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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 <linux/reboot.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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#include "idset.h"
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#include "chp.h"
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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 *channel_subsystems[__MAX_CSSID + 1];
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int css_characteristics_avail = 0;
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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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struct cb_data {
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void *data;
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struct idset *set;
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int (*fn_known_sch)(struct subchannel *, void *);
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int (*fn_unknown_sch)(struct subchannel_id, void *);
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};
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static int call_fn_known_sch(struct device *dev, void *data)
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{
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struct subchannel *sch = to_subchannel(dev);
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struct cb_data *cb = data;
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int rc = 0;
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idset_sch_del(cb->set, sch->schid);
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if (cb->fn_known_sch)
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rc = cb->fn_known_sch(sch, cb->data);
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return rc;
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}
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static int call_fn_unknown_sch(struct subchannel_id schid, void *data)
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{
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struct cb_data *cb = data;
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int rc = 0;
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if (idset_sch_contains(cb->set, schid))
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rc = cb->fn_unknown_sch(schid, cb->data);
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return rc;
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}
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int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
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int (*fn_unknown)(struct subchannel_id,
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void *), void *data)
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{
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struct cb_data cb;
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int rc;
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cb.set = idset_sch_new();
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if (!cb.set)
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return -ENOMEM;
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idset_fill(cb.set);
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cb.data = data;
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cb.fn_known_sch = fn_known;
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cb.fn_unknown_sch = fn_unknown;
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/* Process registered subchannels. */
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rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch);
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if (rc)
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goto out;
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/* Process unregistered subchannels. */
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if (fn_unknown)
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rc = for_each_subchannel(call_fn_unknown_sch, &cb);
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out:
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idset_free(cb.set);
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return rc;
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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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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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static 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 void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
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{
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int i;
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int mask;
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memset(ssd, 0, sizeof(struct chsc_ssd_info));
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ssd->path_mask = pmcw->pim;
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for (i = 0; i < 8; i++) {
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mask = 0x80 >> i;
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if (pmcw->pim & mask) {
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chp_id_init(&ssd->chpid[i]);
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ssd->chpid[i].id = pmcw->chpid[i];
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}
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}
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}
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static void ssd_register_chpids(struct chsc_ssd_info *ssd)
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{
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int i;
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int mask;
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for (i = 0; i < 8; i++) {
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mask = 0x80 >> i;
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if (ssd->path_mask & mask)
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if (!chp_is_registered(ssd->chpid[i]))
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chp_new(ssd->chpid[i]);
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}
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}
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void css_update_ssd_info(struct subchannel *sch)
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{
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int ret;
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if (cio_is_console(sch->schid)) {
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/* Console is initialized too early for functions requiring
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* memory allocation. */
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ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
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} else {
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ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
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if (ret)
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ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
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ssd_register_chpids(&sch->ssd_info);
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}
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}
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static ssize_t type_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct subchannel *sch = to_subchannel(dev);
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return sprintf(buf, "%01x\n", sch->st);
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}
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static DEVICE_ATTR(type, 0444, type_show, NULL);
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct subchannel *sch = to_subchannel(dev);
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return sprintf(buf, "css:t%01X\n", sch->st);
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}
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static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
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static struct attribute *subch_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_modalias.attr,
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NULL,
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};
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static struct attribute_group subch_attr_group = {
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.attrs = subch_attrs,
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};
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static struct attribute_group *default_subch_attr_groups[] = {
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&subch_attr_group,
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NULL,
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};
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static int 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 = &channel_subsystems[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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sch->dev.groups = default_subch_attr_groups;
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/*
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* We don't want to generate uevents for I/O subchannels that don't
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* have a working ccw device behind them since they will be
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* unregistered before they can be used anyway, so we delay the add
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* uevent until after device recognition was successful.
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* Note that we suppress the uevent for all subchannel types;
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* the subchannel driver can decide itself when it wants to inform
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* userspace of its existence.
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*/
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sch->dev.uevent_suppress = 1;
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css_update_ssd_info(sch);
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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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CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n",
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sch->schid.ssid, sch->schid.sch_no, ret);
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return ret;
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}
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if (!sch->driver) {
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/*
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* No driver matched. Generate the uevent now so that
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* a fitting driver module may be loaded based on the
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* modalias.
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*/
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sch->dev.uevent_suppress = 0;
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kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
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}
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return ret;
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}
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static int 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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/**
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* css_sch_is_valid() - check if a subchannel is valid
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* @schib: subchannel information block for the subchannel
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*/
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int css_sch_is_valid(struct schib *schib)
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{
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if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv)
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return 0;
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return 1;
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}
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EXPORT_SYMBOL_GPL(css_sch_is_valid);
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static 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))
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return CIO_GONE;
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if (!css_sch_is_valid(&schib))
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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, 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_err(schid, &schib) || !css_sch_is_valid(&schib)) {
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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 void 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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if (ret == -EAGAIN)
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css_schedule_eval(schid);
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}
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|
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static struct idset *slow_subchannel_set;
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static spinlock_t slow_subchannel_lock;
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static int __init slow_subchannel_init(void)
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{
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spin_lock_init(&slow_subchannel_lock);
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slow_subchannel_set = idset_sch_new();
|
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if (!slow_subchannel_set) {
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CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n");
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return -ENOMEM;
|
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}
|
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return 0;
|
|
}
|
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|
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static int slow_eval_known_fn(struct subchannel *sch, void *data)
|
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{
|
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int eval;
|
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int rc;
|
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|
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spin_lock_irq(&slow_subchannel_lock);
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eval = idset_sch_contains(slow_subchannel_set, sch->schid);
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idset_sch_del(slow_subchannel_set, sch->schid);
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spin_unlock_irq(&slow_subchannel_lock);
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if (eval) {
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rc = css_evaluate_known_subchannel(sch, 1);
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if (rc == -EAGAIN)
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css_schedule_eval(sch->schid);
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}
|
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return 0;
|
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}
|
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|
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static int slow_eval_unknown_fn(struct subchannel_id schid, void *data)
|
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{
|
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int eval;
|
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int rc = 0;
|
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|
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spin_lock_irq(&slow_subchannel_lock);
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eval = idset_sch_contains(slow_subchannel_set, schid);
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idset_sch_del(slow_subchannel_set, schid);
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spin_unlock_irq(&slow_subchannel_lock);
|
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if (eval) {
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rc = css_evaluate_new_subchannel(schid, 1);
|
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switch (rc) {
|
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case -EAGAIN:
|
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css_schedule_eval(schid);
|
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rc = 0;
|
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break;
|
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case -ENXIO:
|
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case -ENOMEM:
|
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case -EIO:
|
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/* These should abort looping */
|
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break;
|
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default:
|
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rc = 0;
|
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}
|
|
}
|
|
return rc;
|
|
}
|
|
|
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static void css_slow_path_func(struct work_struct *unused)
|
|
{
|
|
CIO_TRACE_EVENT(4, "slowpath");
|
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for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn,
|
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NULL);
|
|
}
|
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|
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static DECLARE_WORK(slow_path_work, css_slow_path_func);
|
|
struct workqueue_struct *slow_path_wq;
|
|
|
|
void css_schedule_eval(struct subchannel_id schid)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&slow_subchannel_lock, flags);
|
|
idset_sch_add(slow_subchannel_set, schid);
|
|
queue_work(slow_path_wq, &slow_path_work);
|
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
|
|
}
|
|
|
|
void css_schedule_eval_all(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&slow_subchannel_lock, flags);
|
|
idset_fill(slow_subchannel_set);
|
|
queue_work(slow_path_wq, &slow_path_work);
|
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
|
|
}
|
|
|
|
void css_wait_for_slow_path(void)
|
|
{
|
|
flush_workqueue(ccw_device_notify_work);
|
|
flush_workqueue(slow_path_wq);
|
|
}
|
|
|
|
/* Reprobe subchannel if unregistered. */
|
|
static int reprobe_subchannel(struct subchannel_id schid, void *data)
|
|
{
|
|
int ret;
|
|
|
|
CIO_MSG_EVENT(6, "cio: reprobe 0.%x.%04x\n",
|
|
schid.ssid, schid.sch_no);
|
|
if (need_reprobe)
|
|
return -EAGAIN;
|
|
|
|
ret = css_probe_device(schid);
|
|
switch (ret) {
|
|
case 0:
|
|
break;
|
|
case -ENXIO:
|
|
case -ENOMEM:
|
|
case -EIO:
|
|
/* These should abort looping */
|
|
break;
|
|
default:
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Work function used to reprobe all unregistered subchannels. */
|
|
static void reprobe_all(struct work_struct *unused)
|
|
{
|
|
int ret;
|
|
|
|
CIO_MSG_EVENT(4, "reprobe start\n");
|
|
|
|
need_reprobe = 0;
|
|
/* Make sure initial subchannel scan is done. */
|
|
wait_event(ccw_device_init_wq,
|
|
atomic_read(&ccw_device_init_count) == 0);
|
|
ret = for_each_subchannel_staged(NULL, reprobe_subchannel, NULL);
|
|
|
|
CIO_MSG_EVENT(4, "reprobe done (rc=%d, need_reprobe=%d)\n", ret,
|
|
need_reprobe);
|
|
}
|
|
|
|
static DECLARE_WORK(css_reprobe_work, reprobe_all);
|
|
|
|
/* Schedule reprobing of all unregistered subchannels. */
|
|
void css_schedule_reprobe(void)
|
|
{
|
|
need_reprobe = 1;
|
|
queue_work(slow_path_wq, &css_reprobe_work);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(css_schedule_reprobe);
|
|
|
|
/*
|
|
* Called from the machine check handler for subchannel report words.
|
|
*/
|
|
void css_process_crw(int rsid1, int rsid2)
|
|
{
|
|
struct subchannel_id mchk_schid;
|
|
|
|
CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n",
|
|
rsid1, rsid2);
|
|
init_subchannel_id(&mchk_schid);
|
|
mchk_schid.sch_no = rsid1;
|
|
if (rsid2 != 0)
|
|
mchk_schid.ssid = (rsid2 >> 8) & 3;
|
|
|
|
/*
|
|
* Since we are always presented with IPI in the CRW, we have to
|
|
* use stsch() to find out if the subchannel in question has come
|
|
* or gone.
|
|
*/
|
|
css_evaluate_subchannel(mchk_schid, 0);
|
|
}
|
|
|
|
static int __init
|
|
__init_channel_subsystem(struct subchannel_id schid, void *data)
|
|
{
|
|
struct subchannel *sch;
|
|
int ret;
|
|
|
|
if (cio_is_console(schid))
|
|
sch = cio_get_console_subchannel();
|
|
else {
|
|
sch = css_alloc_subchannel(schid);
|
|
if (IS_ERR(sch))
|
|
ret = PTR_ERR(sch);
|
|
else
|
|
ret = 0;
|
|
switch (ret) {
|
|
case 0:
|
|
break;
|
|
case -ENOMEM:
|
|
panic("Out of memory in init_channel_subsystem\n");
|
|
/* -ENXIO: no more subchannels. */
|
|
case -ENXIO:
|
|
return ret;
|
|
/* -EIO: this subchannel set not supported. */
|
|
case -EIO:
|
|
return ret;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
/*
|
|
* We register ALL valid subchannels in ioinfo, even those
|
|
* that have been present before init_channel_subsystem.
|
|
* These subchannels can't have been registered yet (kmalloc
|
|
* not working) so we do it now. This is true e.g. for the
|
|
* console subchannel.
|
|
*/
|
|
css_register_subchannel(sch);
|
|
return 0;
|
|
}
|
|
|
|
static void __init
|
|
css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
|
|
{
|
|
if (css_characteristics_avail && css_general_characteristics.mcss) {
|
|
css->global_pgid.pgid_high.ext_cssid.version = 0x80;
|
|
css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
|
|
} else {
|
|
#ifdef CONFIG_SMP
|
|
css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id();
|
|
#else
|
|
css->global_pgid.pgid_high.cpu_addr = 0;
|
|
#endif
|
|
}
|
|
css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
|
|
css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
|
|
css->global_pgid.tod_high = tod_high;
|
|
|
|
}
|
|
|
|
static void
|
|
channel_subsystem_release(struct device *dev)
|
|
{
|
|
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);
|
|
int ret;
|
|
|
|
if (!css)
|
|
return 0;
|
|
mutex_lock(&css->mutex);
|
|
ret = sprintf(buf, "%x\n", css->cm_enabled);
|
|
mutex_unlock(&css->mutex);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
unsigned long val;
|
|
|
|
ret = strict_strtoul(buf, 16, &val);
|
|
if (ret)
|
|
return ret;
|
|
mutex_lock(&css->mutex);
|
|
switch (val) {
|
|
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;
|
|
}
|
|
mutex_unlock(&css->mutex);
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store);
|
|
|
|
static int __init setup_css(int nr)
|
|
{
|
|
u32 tod_high;
|
|
int ret;
|
|
struct channel_subsystem *css;
|
|
|
|
css = channel_subsystems[nr];
|
|
memset(css, 0, sizeof(struct channel_subsystem));
|
|
css->pseudo_subchannel =
|
|
kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL);
|
|
if (!css->pseudo_subchannel)
|
|
return -ENOMEM;
|
|
css->pseudo_subchannel->dev.parent = &css->device;
|
|
css->pseudo_subchannel->dev.release = css_subchannel_release;
|
|
sprintf(css->pseudo_subchannel->dev.bus_id, "defunct");
|
|
ret = cio_create_sch_lock(css->pseudo_subchannel);
|
|
if (ret) {
|
|
kfree(css->pseudo_subchannel);
|
|
return ret;
|
|
}
|
|
mutex_init(&css->mutex);
|
|
css->valid = 1;
|
|
css->cssid = nr;
|
|
sprintf(css->device.bus_id, "css%x", nr);
|
|
css->device.release = channel_subsystem_release;
|
|
tod_high = (u32) (get_clock() >> 32);
|
|
css_generate_pgid(css, tod_high);
|
|
return 0;
|
|
}
|
|
|
|
static int css_reboot_event(struct notifier_block *this,
|
|
unsigned long event,
|
|
void *ptr)
|
|
{
|
|
int ret, i;
|
|
|
|
ret = NOTIFY_DONE;
|
|
for (i = 0; i <= __MAX_CSSID; i++) {
|
|
struct channel_subsystem *css;
|
|
|
|
css = channel_subsystems[i];
|
|
mutex_lock(&css->mutex);
|
|
if (css->cm_enabled)
|
|
if (chsc_secm(css, 0))
|
|
ret = NOTIFY_BAD;
|
|
mutex_unlock(&css->mutex);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block css_reboot_notifier = {
|
|
.notifier_call = css_reboot_event,
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
|
|
ret = chsc_determine_css_characteristics();
|
|
if (ret == -ENOMEM)
|
|
goto out; /* No need to continue. */
|
|
if (ret == 0)
|
|
css_characteristics_avail = 1;
|
|
|
|
ret = chsc_alloc_sei_area();
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = slow_subchannel_init();
|
|
if (ret)
|
|
goto out;
|
|
|
|
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++) {
|
|
struct channel_subsystem *css;
|
|
|
|
css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL);
|
|
if (!css) {
|
|
ret = -ENOMEM;
|
|
goto out_unregister;
|
|
}
|
|
channel_subsystems[i] = css;
|
|
ret = setup_css(i);
|
|
if (ret)
|
|
goto out_free;
|
|
ret = device_register(&css->device);
|
|
if (ret)
|
|
goto out_free_all;
|
|
if (css_characteristics_avail &&
|
|
css_chsc_characteristics.secm) {
|
|
ret = device_create_file(&css->device,
|
|
&dev_attr_cm_enable);
|
|
if (ret)
|
|
goto out_device;
|
|
}
|
|
ret = device_register(&css->pseudo_subchannel->dev);
|
|
if (ret)
|
|
goto out_file;
|
|
}
|
|
ret = register_reboot_notifier(&css_reboot_notifier);
|
|
if (ret)
|
|
goto out_pseudo;
|
|
css_init_done = 1;
|
|
|
|
ctl_set_bit(6, 28);
|
|
|
|
for_each_subchannel(__init_channel_subsystem, NULL);
|
|
return 0;
|
|
out_pseudo:
|
|
device_unregister(&channel_subsystems[i]->pseudo_subchannel->dev);
|
|
out_file:
|
|
device_remove_file(&channel_subsystems[i]->device,
|
|
&dev_attr_cm_enable);
|
|
out_device:
|
|
device_unregister(&channel_subsystems[i]->device);
|
|
out_free_all:
|
|
kfree(channel_subsystems[i]->pseudo_subchannel->lock);
|
|
kfree(channel_subsystems[i]->pseudo_subchannel);
|
|
out_free:
|
|
kfree(channel_subsystems[i]);
|
|
out_unregister:
|
|
while (i > 0) {
|
|
struct channel_subsystem *css;
|
|
|
|
i--;
|
|
css = channel_subsystems[i];
|
|
device_unregister(&css->pseudo_subchannel->dev);
|
|
if (css_characteristics_avail && css_chsc_characteristics.secm)
|
|
device_remove_file(&css->device,
|
|
&dev_attr_cm_enable);
|
|
device_unregister(&css->device);
|
|
}
|
|
out_bus:
|
|
bus_unregister(&css_bus_type);
|
|
out:
|
|
chsc_free_sei_area();
|
|
kfree(slow_subchannel_set);
|
|
printk(KERN_WARNING"cio: failed to initialize css driver (%d)!\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
int sch_is_pseudo_sch(struct subchannel *sch)
|
|
{
|
|
return sch == to_css(sch->dev.parent)->pseudo_subchannel;
|
|
}
|
|
|
|
/*
|
|
* 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 = to_subchannel(dev);
|
|
struct css_driver *driver = to_cssdriver(drv);
|
|
|
|
if (sch->st == driver->subchannel_type)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int css_probe(struct device *dev)
|
|
{
|
|
struct subchannel *sch;
|
|
int ret;
|
|
|
|
sch = to_subchannel(dev);
|
|
sch->driver = to_cssdriver(dev->driver);
|
|
ret = sch->driver->probe ? sch->driver->probe(sch) : 0;
|
|
if (ret)
|
|
sch->driver = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int css_remove(struct device *dev)
|
|
{
|
|
struct subchannel *sch;
|
|
int ret;
|
|
|
|
sch = to_subchannel(dev);
|
|
ret = sch->driver->remove ? sch->driver->remove(sch) : 0;
|
|
sch->driver = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static void css_shutdown(struct device *dev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(dev);
|
|
if (sch->driver && sch->driver->shutdown)
|
|
sch->driver->shutdown(sch);
|
|
}
|
|
|
|
static int css_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
int ret;
|
|
|
|
ret = add_uevent_var(env, "ST=%01X", sch->st);
|
|
if (ret)
|
|
return ret;
|
|
ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st);
|
|
return ret;
|
|
}
|
|
|
|
struct bus_type css_bus_type = {
|
|
.name = "css",
|
|
.match = css_bus_match,
|
|
.probe = css_probe,
|
|
.remove = css_remove,
|
|
.shutdown = css_shutdown,
|
|
.uevent = css_uevent,
|
|
};
|
|
|
|
/**
|
|
* css_driver_register - register a css driver
|
|
* @cdrv: css driver to register
|
|
*
|
|
* This is mainly a wrapper around driver_register that sets name
|
|
* and bus_type in the embedded struct device_driver correctly.
|
|
*/
|
|
int css_driver_register(struct css_driver *cdrv)
|
|
{
|
|
cdrv->drv.name = cdrv->name;
|
|
cdrv->drv.bus = &css_bus_type;
|
|
cdrv->drv.owner = cdrv->owner;
|
|
return driver_register(&cdrv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(css_driver_register);
|
|
|
|
/**
|
|
* css_driver_unregister - unregister a css driver
|
|
* @cdrv: css driver to unregister
|
|
*
|
|
* This is a wrapper around driver_unregister.
|
|
*/
|
|
void css_driver_unregister(struct css_driver *cdrv)
|
|
{
|
|
driver_unregister(&cdrv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(css_driver_unregister);
|
|
|
|
subsys_initcall(init_channel_subsystem);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
EXPORT_SYMBOL(css_bus_type);
|
|
EXPORT_SYMBOL_GPL(css_characteristics_avail);
|