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1439 lines
33 KiB
1439 lines
33 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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* driver for channel subsystem |
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* |
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* Copyright IBM Corp. 2002, 2010 |
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* |
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* Author(s): Arnd Bergmann ([email protected]) |
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* Cornelia Huck ([email protected]) |
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*/ |
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|
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#define KMSG_COMPONENT "cio" |
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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|
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#include <linux/export.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 <linux/proc_fs.h> |
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#include <linux/genalloc.h> |
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#include <linux/dma-mapping.h> |
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#include <asm/isc.h> |
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#include <asm/crw.h> |
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|
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#include "css.h" |
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#include "cio.h" |
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#include "blacklist.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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|
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int css_init_done = 0; |
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int max_ssid; |
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|
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#define MAX_CSS_IDX 0 |
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struct channel_subsystem *channel_subsystems[MAX_CSS_IDX + 1]; |
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static struct bus_type css_bus_type; |
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|
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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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|
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init_subchannel_id(&schid); |
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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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|
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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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|
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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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|
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if (cb->set) |
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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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|
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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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|
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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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|
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static int call_fn_all_sch(struct subchannel_id schid, void *data) |
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{ |
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struct cb_data *cb = data; |
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struct subchannel *sch; |
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int rc = 0; |
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|
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sch = get_subchannel_by_schid(schid); |
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if (sch) { |
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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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put_device(&sch->dev); |
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} else { |
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if (cb->fn_unknown_sch) |
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rc = cb->fn_unknown_sch(schid, cb->data); |
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} |
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|
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return rc; |
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} |
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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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|
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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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|
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if (fn_known && !fn_unknown) { |
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/* Skip idset allocation in case of known-only loop. */ |
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cb.set = NULL; |
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return bus_for_each_dev(&css_bus_type, NULL, &cb, |
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call_fn_known_sch); |
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} |
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|
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cb.set = idset_sch_new(); |
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if (!cb.set) |
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/* fall back to brute force scanning in case of oom */ |
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return for_each_subchannel(call_fn_all_sch, &cb); |
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|
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idset_fill(cb.set); |
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|
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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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|
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return rc; |
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} |
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|
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static void css_sch_todo(struct work_struct *work); |
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|
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static int css_sch_create_locks(struct subchannel *sch) |
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{ |
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sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL); |
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if (!sch->lock) |
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return -ENOMEM; |
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|
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spin_lock_init(sch->lock); |
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mutex_init(&sch->reg_mutex); |
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|
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return 0; |
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} |
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|
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static void css_subchannel_release(struct device *dev) |
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{ |
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struct subchannel *sch = to_subchannel(dev); |
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|
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sch->config.intparm = 0; |
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cio_commit_config(sch); |
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kfree(sch->driver_override); |
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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_validate_subchannel(struct subchannel_id schid, |
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struct schib *schib) |
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{ |
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int err; |
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|
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switch (schib->pmcw.st) { |
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case SUBCHANNEL_TYPE_IO: |
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case SUBCHANNEL_TYPE_MSG: |
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if (!css_sch_is_valid(schib)) |
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err = -ENODEV; |
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else if (is_blacklisted(schid.ssid, schib->pmcw.dev)) { |
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CIO_MSG_EVENT(6, "Blacklisted device detected " |
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"at devno %04X, subchannel set %x\n", |
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schib->pmcw.dev, schid.ssid); |
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err = -ENODEV; |
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} else |
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err = 0; |
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break; |
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default: |
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err = 0; |
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} |
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if (err) |
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goto out; |
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|
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CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
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schid.ssid, schid.sch_no, schib->pmcw.st); |
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out: |
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return err; |
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} |
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|
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struct subchannel *css_alloc_subchannel(struct subchannel_id schid, |
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struct schib *schib) |
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{ |
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struct subchannel *sch; |
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int ret; |
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|
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ret = css_validate_subchannel(schid, schib); |
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if (ret < 0) |
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return ERR_PTR(ret); |
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|
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sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA); |
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if (!sch) |
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return ERR_PTR(-ENOMEM); |
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|
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sch->schid = schid; |
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sch->schib = *schib; |
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sch->st = schib->pmcw.st; |
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|
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ret = css_sch_create_locks(sch); |
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if (ret) |
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goto err; |
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INIT_WORK(&sch->todo_work, css_sch_todo); |
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sch->dev.release = &css_subchannel_release; |
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sch->dev.dma_mask = &sch->dma_mask; |
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device_initialize(&sch->dev); |
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/* |
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* The physical addresses for some of the dma structures that can |
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* belong to a subchannel need to fit 31 bit width (e.g. ccw). |
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*/ |
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ret = dma_set_coherent_mask(&sch->dev, DMA_BIT_MASK(31)); |
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if (ret) |
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goto err; |
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/* |
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* But we don't have such restrictions imposed on the stuff that |
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* is handled by the streaming API. |
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*/ |
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ret = dma_set_mask(&sch->dev, DMA_BIT_MASK(64)); |
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if (ret) |
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goto err; |
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|
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return sch; |
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|
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err: |
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kfree(sch); |
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return ERR_PTR(ret); |
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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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|
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mutex_lock(&sch->reg_mutex); |
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dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
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sch->schid.sch_no); |
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ret = device_add(&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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|
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/** |
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* css_sch_device_unregister - unregister a subchannel |
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* @sch: subchannel to be unregistered |
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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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if (device_is_registered(&sch->dev)) |
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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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EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
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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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|
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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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|
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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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chp_new(ssd->chpid[i]); |
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} |
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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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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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|
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ssd_register_chpids(&sch->ssd_info); |
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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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|
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return sprintf(buf, "%01x\n", sch->st); |
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} |
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static DEVICE_ATTR_RO(type); |
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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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|
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return sprintf(buf, "css:t%01X\n", sch->st); |
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} |
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static DEVICE_ATTR_RO(modalias); |
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|
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static ssize_t driver_override_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct subchannel *sch = to_subchannel(dev); |
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char *driver_override, *old, *cp; |
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|
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/* We need to keep extra room for a newline */ |
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if (count >= (PAGE_SIZE - 1)) |
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return -EINVAL; |
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driver_override = kstrndup(buf, count, GFP_KERNEL); |
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if (!driver_override) |
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return -ENOMEM; |
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cp = strchr(driver_override, '\n'); |
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if (cp) |
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*cp = '\0'; |
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device_lock(dev); |
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old = sch->driver_override; |
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if (strlen(driver_override)) { |
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sch->driver_override = driver_override; |
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} else { |
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kfree(driver_override); |
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sch->driver_override = NULL; |
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} |
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device_unlock(dev); |
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kfree(old); |
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return count; |
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} |
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static ssize_t driver_override_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct subchannel *sch = to_subchannel(dev); |
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ssize_t len; |
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|
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device_lock(dev); |
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len = snprintf(buf, PAGE_SIZE, "%s\n", sch->driver_override); |
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device_unlock(dev); |
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return len; |
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} |
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static DEVICE_ATTR_RW(driver_override); |
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|
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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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&dev_attr_driver_override.attr, |
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NULL, |
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}; |
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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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|
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static const 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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|
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static ssize_t chpids_show(struct device *dev, |
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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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struct chsc_ssd_info *ssd = &sch->ssd_info; |
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ssize_t ret = 0; |
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int mask; |
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int chp; |
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|
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for (chp = 0; chp < 8; chp++) { |
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mask = 0x80 >> chp; |
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if (ssd->path_mask & mask) |
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ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); |
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else |
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ret += sprintf(buf + ret, "00 "); |
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} |
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ret += sprintf(buf + ret, "\n"); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(chpids); |
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|
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static ssize_t pimpampom_show(struct device *dev, |
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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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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 DEVICE_ATTR_RO(pimpampom); |
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|
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static struct attribute *io_subchannel_type_attrs[] = { |
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&dev_attr_chpids.attr, |
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&dev_attr_pimpampom.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(io_subchannel_type); |
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|
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static const struct device_type io_subchannel_type = { |
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.groups = io_subchannel_type_groups, |
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}; |
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|
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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.groups = default_subch_attr_groups; |
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|
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if (sch->st == SUBCHANNEL_TYPE_IO) |
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sch->dev.type = &io_subchannel_type; |
|
|
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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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dev_set_uevent_suppress(&sch->dev, 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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dev_set_uevent_suppress(&sch->dev, 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, struct schib *schib) |
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{ |
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struct subchannel *sch; |
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int ret; |
|
|
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sch = css_alloc_subchannel(schid, schib); |
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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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put_device(&sch->dev); |
|
|
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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, const void *data) |
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{ |
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struct subchannel *sch; |
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struct subchannel_id *schid = (void *)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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/** |
|
* css_sch_is_valid() - check if a subchannel is valid |
|
* @schib: subchannel information block for the subchannel |
|
*/ |
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int css_sch_is_valid(struct schib *schib) |
|
{ |
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if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) |
|
return 0; |
|
if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
|
return 0; |
|
return 1; |
|
} |
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EXPORT_SYMBOL_GPL(css_sch_is_valid); |
|
|
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static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
|
{ |
|
struct schib schib; |
|
int ccode; |
|
|
|
if (!slow) { |
|
/* Will be done on the slow path. */ |
|
return -EAGAIN; |
|
} |
|
/* |
|
* The first subchannel that is not-operational (ccode==3) |
|
* indicates that there aren't any more devices available. |
|
* If stsch gets an exception, it means the current subchannel set |
|
* is not valid. |
|
*/ |
|
ccode = stsch(schid, &schib); |
|
if (ccode) |
|
return (ccode == 3) ? -ENXIO : ccode; |
|
|
|
return css_probe_device(schid, &schib); |
|
} |
|
|
|
static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
|
{ |
|
int ret = 0; |
|
|
|
if (sch->driver) { |
|
if (sch->driver->sch_event) |
|
ret = sch->driver->sch_event(sch, slow); |
|
else |
|
dev_dbg(&sch->dev, |
|
"Got subchannel machine check but " |
|
"no sch_event handler provided.\n"); |
|
} |
|
if (ret != 0 && ret != -EAGAIN) { |
|
CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", |
|
sch->schid.ssid, sch->schid.sch_no, ret); |
|
} |
|
return ret; |
|
} |
|
|
|
static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
|
{ |
|
struct subchannel *sch; |
|
int ret; |
|
|
|
sch = get_subchannel_by_schid(schid); |
|
if (sch) { |
|
ret = css_evaluate_known_subchannel(sch, slow); |
|
put_device(&sch->dev); |
|
} else |
|
ret = css_evaluate_new_subchannel(schid, slow); |
|
if (ret == -EAGAIN) |
|
css_schedule_eval(schid); |
|
} |
|
|
|
/** |
|
* css_sched_sch_todo - schedule a subchannel operation |
|
* @sch: subchannel |
|
* @todo: todo |
|
* |
|
* Schedule the operation identified by @todo to be performed on the slow path |
|
* workqueue. Do nothing if another operation with higher priority is already |
|
* scheduled. Needs to be called with subchannel lock held. |
|
*/ |
|
void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) |
|
{ |
|
CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n", |
|
sch->schid.ssid, sch->schid.sch_no, todo); |
|
if (sch->todo >= todo) |
|
return; |
|
/* Get workqueue ref. */ |
|
if (!get_device(&sch->dev)) |
|
return; |
|
sch->todo = todo; |
|
if (!queue_work(cio_work_q, &sch->todo_work)) { |
|
/* Already queued, release workqueue ref. */ |
|
put_device(&sch->dev); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(css_sched_sch_todo); |
|
|
|
static void css_sch_todo(struct work_struct *work) |
|
{ |
|
struct subchannel *sch; |
|
enum sch_todo todo; |
|
int ret; |
|
|
|
sch = container_of(work, struct subchannel, todo_work); |
|
/* Find out todo. */ |
|
spin_lock_irq(sch->lock); |
|
todo = sch->todo; |
|
CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid, |
|
sch->schid.sch_no, todo); |
|
sch->todo = SCH_TODO_NOTHING; |
|
spin_unlock_irq(sch->lock); |
|
/* Perform todo. */ |
|
switch (todo) { |
|
case SCH_TODO_NOTHING: |
|
break; |
|
case SCH_TODO_EVAL: |
|
ret = css_evaluate_known_subchannel(sch, 1); |
|
if (ret == -EAGAIN) { |
|
spin_lock_irq(sch->lock); |
|
css_sched_sch_todo(sch, todo); |
|
spin_unlock_irq(sch->lock); |
|
} |
|
break; |
|
case SCH_TODO_UNREG: |
|
css_sch_device_unregister(sch); |
|
break; |
|
} |
|
/* Release workqueue ref. */ |
|
put_device(&sch->dev); |
|
} |
|
|
|
static struct idset *slow_subchannel_set; |
|
static DEFINE_SPINLOCK(slow_subchannel_lock); |
|
static DECLARE_WAIT_QUEUE_HEAD(css_eval_wq); |
|
static atomic_t css_eval_scheduled; |
|
|
|
static int __init slow_subchannel_init(void) |
|
{ |
|
atomic_set(&css_eval_scheduled, 0); |
|
slow_subchannel_set = idset_sch_new(); |
|
if (!slow_subchannel_set) { |
|
CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
|
return -ENOMEM; |
|
} |
|
return 0; |
|
} |
|
|
|
static int slow_eval_known_fn(struct subchannel *sch, void *data) |
|
{ |
|
int eval; |
|
int rc; |
|
|
|
spin_lock_irq(&slow_subchannel_lock); |
|
eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
|
idset_sch_del(slow_subchannel_set, sch->schid); |
|
spin_unlock_irq(&slow_subchannel_lock); |
|
if (eval) { |
|
rc = css_evaluate_known_subchannel(sch, 1); |
|
if (rc == -EAGAIN) |
|
css_schedule_eval(sch->schid); |
|
/* |
|
* The loop might take long time for platforms with lots of |
|
* known devices. Allow scheduling here. |
|
*/ |
|
cond_resched(); |
|
} |
|
return 0; |
|
} |
|
|
|
static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) |
|
{ |
|
int eval; |
|
int rc = 0; |
|
|
|
spin_lock_irq(&slow_subchannel_lock); |
|
eval = idset_sch_contains(slow_subchannel_set, schid); |
|
idset_sch_del(slow_subchannel_set, schid); |
|
spin_unlock_irq(&slow_subchannel_lock); |
|
if (eval) { |
|
rc = css_evaluate_new_subchannel(schid, 1); |
|
switch (rc) { |
|
case -EAGAIN: |
|
css_schedule_eval(schid); |
|
rc = 0; |
|
break; |
|
case -ENXIO: |
|
case -ENOMEM: |
|
case -EIO: |
|
/* These should abort looping */ |
|
spin_lock_irq(&slow_subchannel_lock); |
|
idset_sch_del_subseq(slow_subchannel_set, schid); |
|
spin_unlock_irq(&slow_subchannel_lock); |
|
break; |
|
default: |
|
rc = 0; |
|
} |
|
/* Allow scheduling here since the containing loop might |
|
* take a while. */ |
|
cond_resched(); |
|
} |
|
return rc; |
|
} |
|
|
|
static void css_slow_path_func(struct work_struct *unused) |
|
{ |
|
unsigned long flags; |
|
|
|
CIO_TRACE_EVENT(4, "slowpath"); |
|
for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, |
|
NULL); |
|
spin_lock_irqsave(&slow_subchannel_lock, flags); |
|
if (idset_is_empty(slow_subchannel_set)) { |
|
atomic_set(&css_eval_scheduled, 0); |
|
wake_up(&css_eval_wq); |
|
} |
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
|
} |
|
|
|
static DECLARE_DELAYED_WORK(slow_path_work, css_slow_path_func); |
|
struct workqueue_struct *cio_work_q; |
|
|
|
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); |
|
atomic_set(&css_eval_scheduled, 1); |
|
queue_delayed_work(cio_work_q, &slow_path_work, 0); |
|
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); |
|
atomic_set(&css_eval_scheduled, 1); |
|
queue_delayed_work(cio_work_q, &slow_path_work, 0); |
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
|
} |
|
|
|
static int __unset_registered(struct device *dev, void *data) |
|
{ |
|
struct idset *set = data; |
|
struct subchannel *sch = to_subchannel(dev); |
|
|
|
idset_sch_del(set, sch->schid); |
|
return 0; |
|
} |
|
|
|
void css_schedule_eval_all_unreg(unsigned long delay) |
|
{ |
|
unsigned long flags; |
|
struct idset *unreg_set; |
|
|
|
/* Find unregistered subchannels. */ |
|
unreg_set = idset_sch_new(); |
|
if (!unreg_set) { |
|
/* Fallback. */ |
|
css_schedule_eval_all(); |
|
return; |
|
} |
|
idset_fill(unreg_set); |
|
bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); |
|
/* Apply to slow_subchannel_set. */ |
|
spin_lock_irqsave(&slow_subchannel_lock, flags); |
|
idset_add_set(slow_subchannel_set, unreg_set); |
|
atomic_set(&css_eval_scheduled, 1); |
|
queue_delayed_work(cio_work_q, &slow_path_work, delay); |
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
|
idset_free(unreg_set); |
|
} |
|
|
|
void css_wait_for_slow_path(void) |
|
{ |
|
flush_workqueue(cio_work_q); |
|
} |
|
|
|
/* Schedule reprobing of all unregistered subchannels. */ |
|
void css_schedule_reprobe(void) |
|
{ |
|
/* Schedule with a delay to allow merging of subsequent calls. */ |
|
css_schedule_eval_all_unreg(1 * HZ); |
|
} |
|
EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
|
|
|
/* |
|
* Called from the machine check handler for subchannel report words. |
|
*/ |
|
static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
|
{ |
|
struct subchannel_id mchk_schid; |
|
struct subchannel *sch; |
|
|
|
if (overflow) { |
|
css_schedule_eval_all(); |
|
return; |
|
} |
|
CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " |
|
"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", |
|
crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, |
|
crw0->erc, crw0->rsid); |
|
if (crw1) |
|
CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " |
|
"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", |
|
crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, |
|
crw1->anc, crw1->erc, crw1->rsid); |
|
init_subchannel_id(&mchk_schid); |
|
mchk_schid.sch_no = crw0->rsid; |
|
if (crw1) |
|
mchk_schid.ssid = (crw1->rsid >> 4) & 3; |
|
|
|
if (crw0->erc == CRW_ERC_PMOD) { |
|
sch = get_subchannel_by_schid(mchk_schid); |
|
if (sch) { |
|
css_update_ssd_info(sch); |
|
put_device(&sch->dev); |
|
} |
|
} |
|
/* |
|
* 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 void __init |
|
css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
|
{ |
|
struct cpuid cpu_id; |
|
|
|
if (css_general_characteristics.mcss) { |
|
css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
|
css->global_pgid.pgid_high.ext_cssid.cssid = |
|
css->id_valid ? css->cssid : 0; |
|
} else { |
|
css->global_pgid.pgid_high.cpu_addr = stap(); |
|
} |
|
get_cpu_id(&cpu_id); |
|
css->global_pgid.cpu_id = cpu_id.ident; |
|
css->global_pgid.cpu_model = cpu_id.machine; |
|
css->global_pgid.tod_high = tod_high; |
|
} |
|
|
|
static void channel_subsystem_release(struct device *dev) |
|
{ |
|
struct channel_subsystem *css = to_css(dev); |
|
|
|
mutex_destroy(&css->mutex); |
|
kfree(css); |
|
} |
|
|
|
static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a, |
|
char *buf) |
|
{ |
|
struct channel_subsystem *css = to_css(dev); |
|
|
|
if (!css->id_valid) |
|
return -EINVAL; |
|
|
|
return sprintf(buf, "%x\n", css->cssid); |
|
} |
|
static DEVICE_ATTR_RO(real_cssid); |
|
|
|
static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a, |
|
char *buf) |
|
{ |
|
struct channel_subsystem *css = to_css(dev); |
|
int ret; |
|
|
|
mutex_lock(&css->mutex); |
|
ret = sprintf(buf, "%x\n", css->cm_enabled); |
|
mutex_unlock(&css->mutex); |
|
return ret; |
|
} |
|
|
|
static ssize_t cm_enable_store(struct device *dev, struct device_attribute *a, |
|
const char *buf, size_t count) |
|
{ |
|
struct channel_subsystem *css = to_css(dev); |
|
unsigned long val; |
|
int ret; |
|
|
|
ret = kstrtoul(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_RW(cm_enable); |
|
|
|
static umode_t cm_enable_mode(struct kobject *kobj, struct attribute *attr, |
|
int index) |
|
{ |
|
return css_chsc_characteristics.secm ? attr->mode : 0; |
|
} |
|
|
|
static struct attribute *cssdev_attrs[] = { |
|
&dev_attr_real_cssid.attr, |
|
NULL, |
|
}; |
|
|
|
static struct attribute_group cssdev_attr_group = { |
|
.attrs = cssdev_attrs, |
|
}; |
|
|
|
static struct attribute *cssdev_cm_attrs[] = { |
|
&dev_attr_cm_enable.attr, |
|
NULL, |
|
}; |
|
|
|
static struct attribute_group cssdev_cm_attr_group = { |
|
.attrs = cssdev_cm_attrs, |
|
.is_visible = cm_enable_mode, |
|
}; |
|
|
|
static const struct attribute_group *cssdev_attr_groups[] = { |
|
&cssdev_attr_group, |
|
&cssdev_cm_attr_group, |
|
NULL, |
|
}; |
|
|
|
static int __init setup_css(int nr) |
|
{ |
|
struct channel_subsystem *css; |
|
int ret; |
|
|
|
css = kzalloc(sizeof(*css), GFP_KERNEL); |
|
if (!css) |
|
return -ENOMEM; |
|
|
|
channel_subsystems[nr] = css; |
|
dev_set_name(&css->device, "css%x", nr); |
|
css->device.groups = cssdev_attr_groups; |
|
css->device.release = channel_subsystem_release; |
|
/* |
|
* We currently allocate notifier bits with this (using |
|
* css->device as the device argument with the DMA API) |
|
* and are fine with 64 bit addresses. |
|
*/ |
|
ret = dma_coerce_mask_and_coherent(&css->device, DMA_BIT_MASK(64)); |
|
if (ret) { |
|
kfree(css); |
|
goto out_err; |
|
} |
|
|
|
mutex_init(&css->mutex); |
|
ret = chsc_get_cssid_iid(nr, &css->cssid, &css->iid); |
|
if (!ret) { |
|
css->id_valid = true; |
|
pr_info("Partition identifier %01x.%01x\n", css->cssid, |
|
css->iid); |
|
} |
|
css_generate_pgid(css, (u32) (get_tod_clock() >> 32)); |
|
|
|
ret = device_register(&css->device); |
|
if (ret) { |
|
put_device(&css->device); |
|
goto out_err; |
|
} |
|
|
|
css->pseudo_subchannel = kzalloc(sizeof(*css->pseudo_subchannel), |
|
GFP_KERNEL); |
|
if (!css->pseudo_subchannel) { |
|
device_unregister(&css->device); |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
css->pseudo_subchannel->dev.parent = &css->device; |
|
css->pseudo_subchannel->dev.release = css_subchannel_release; |
|
mutex_init(&css->pseudo_subchannel->reg_mutex); |
|
ret = css_sch_create_locks(css->pseudo_subchannel); |
|
if (ret) { |
|
kfree(css->pseudo_subchannel); |
|
device_unregister(&css->device); |
|
goto out_err; |
|
} |
|
|
|
dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
|
ret = device_register(&css->pseudo_subchannel->dev); |
|
if (ret) { |
|
put_device(&css->pseudo_subchannel->dev); |
|
device_unregister(&css->device); |
|
goto out_err; |
|
} |
|
|
|
return ret; |
|
out_err: |
|
channel_subsystems[nr] = NULL; |
|
return ret; |
|
} |
|
|
|
static int css_reboot_event(struct notifier_block *this, |
|
unsigned long event, |
|
void *ptr) |
|
{ |
|
struct channel_subsystem *css; |
|
int ret; |
|
|
|
ret = NOTIFY_DONE; |
|
for_each_css(css) { |
|
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, |
|
}; |
|
|
|
#define CIO_DMA_GFP (GFP_KERNEL | __GFP_ZERO) |
|
static struct gen_pool *cio_dma_pool; |
|
|
|
/* Currently cio supports only a single css */ |
|
struct device *cio_get_dma_css_dev(void) |
|
{ |
|
return &channel_subsystems[0]->device; |
|
} |
|
|
|
struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages) |
|
{ |
|
struct gen_pool *gp_dma; |
|
void *cpu_addr; |
|
dma_addr_t dma_addr; |
|
int i; |
|
|
|
gp_dma = gen_pool_create(3, -1); |
|
if (!gp_dma) |
|
return NULL; |
|
for (i = 0; i < nr_pages; ++i) { |
|
cpu_addr = dma_alloc_coherent(dma_dev, PAGE_SIZE, &dma_addr, |
|
CIO_DMA_GFP); |
|
if (!cpu_addr) |
|
return gp_dma; |
|
gen_pool_add_virt(gp_dma, (unsigned long) cpu_addr, |
|
dma_addr, PAGE_SIZE, -1); |
|
} |
|
return gp_dma; |
|
} |
|
|
|
static void __gp_dma_free_dma(struct gen_pool *pool, |
|
struct gen_pool_chunk *chunk, void *data) |
|
{ |
|
size_t chunk_size = chunk->end_addr - chunk->start_addr + 1; |
|
|
|
dma_free_coherent((struct device *) data, chunk_size, |
|
(void *) chunk->start_addr, |
|
(dma_addr_t) chunk->phys_addr); |
|
} |
|
|
|
void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev) |
|
{ |
|
if (!gp_dma) |
|
return; |
|
/* this is quite ugly but no better idea */ |
|
gen_pool_for_each_chunk(gp_dma, __gp_dma_free_dma, dma_dev); |
|
gen_pool_destroy(gp_dma); |
|
} |
|
|
|
static int cio_dma_pool_init(void) |
|
{ |
|
/* No need to free up the resources: compiled in */ |
|
cio_dma_pool = cio_gp_dma_create(cio_get_dma_css_dev(), 1); |
|
if (!cio_dma_pool) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
|
|
void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev, |
|
size_t size) |
|
{ |
|
dma_addr_t dma_addr; |
|
unsigned long addr; |
|
size_t chunk_size; |
|
|
|
if (!gp_dma) |
|
return NULL; |
|
addr = gen_pool_alloc(gp_dma, size); |
|
while (!addr) { |
|
chunk_size = round_up(size, PAGE_SIZE); |
|
addr = (unsigned long) dma_alloc_coherent(dma_dev, |
|
chunk_size, &dma_addr, CIO_DMA_GFP); |
|
if (!addr) |
|
return NULL; |
|
gen_pool_add_virt(gp_dma, addr, dma_addr, chunk_size, -1); |
|
addr = gen_pool_alloc(gp_dma, size); |
|
} |
|
return (void *) addr; |
|
} |
|
|
|
void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size) |
|
{ |
|
if (!cpu_addr) |
|
return; |
|
memset(cpu_addr, 0, size); |
|
gen_pool_free(gp_dma, (unsigned long) cpu_addr, size); |
|
} |
|
|
|
/* |
|
* Allocate dma memory from the css global pool. Intended for memory not |
|
* specific to any single device within the css. The allocated memory |
|
* is not guaranteed to be 31-bit addressable. |
|
* |
|
* Caution: Not suitable for early stuff like console. |
|
*/ |
|
void *cio_dma_zalloc(size_t size) |
|
{ |
|
return cio_gp_dma_zalloc(cio_dma_pool, cio_get_dma_css_dev(), size); |
|
} |
|
|
|
void cio_dma_free(void *cpu_addr, size_t size) |
|
{ |
|
cio_gp_dma_free(cio_dma_pool, cpu_addr, size); |
|
} |
|
|
|
/* |
|
* Now that the driver core is running, we can setup our channel subsystem. |
|
* The struct subchannel's are created during probing. |
|
*/ |
|
static int __init css_bus_init(void) |
|
{ |
|
int ret, i; |
|
|
|
ret = chsc_init(); |
|
if (ret) |
|
return ret; |
|
|
|
chsc_determine_css_characteristics(); |
|
/* Try to enable MSS. */ |
|
ret = chsc_enable_facility(CHSC_SDA_OC_MSS); |
|
if (ret) |
|
max_ssid = 0; |
|
else /* Success. */ |
|
max_ssid = __MAX_SSID; |
|
|
|
ret = slow_subchannel_init(); |
|
if (ret) |
|
goto out; |
|
|
|
ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
|
if (ret) |
|
goto out; |
|
|
|
if ((ret = bus_register(&css_bus_type))) |
|
goto out; |
|
|
|
/* Setup css structure. */ |
|
for (i = 0; i <= MAX_CSS_IDX; i++) { |
|
ret = setup_css(i); |
|
if (ret) |
|
goto out_unregister; |
|
} |
|
ret = register_reboot_notifier(&css_reboot_notifier); |
|
if (ret) |
|
goto out_unregister; |
|
ret = cio_dma_pool_init(); |
|
if (ret) |
|
goto out_unregister_rn; |
|
airq_init(); |
|
css_init_done = 1; |
|
|
|
/* Enable default isc for I/O subchannels. */ |
|
isc_register(IO_SCH_ISC); |
|
|
|
return 0; |
|
out_unregister_rn: |
|
unregister_reboot_notifier(&css_reboot_notifier); |
|
out_unregister: |
|
while (i-- > 0) { |
|
struct channel_subsystem *css = channel_subsystems[i]; |
|
device_unregister(&css->pseudo_subchannel->dev); |
|
device_unregister(&css->device); |
|
} |
|
bus_unregister(&css_bus_type); |
|
out: |
|
crw_unregister_handler(CRW_RSC_SCH); |
|
idset_free(slow_subchannel_set); |
|
chsc_init_cleanup(); |
|
pr_alert("The CSS device driver initialization failed with " |
|
"errno=%d\n", ret); |
|
return ret; |
|
} |
|
|
|
static void __init css_bus_cleanup(void) |
|
{ |
|
struct channel_subsystem *css; |
|
|
|
for_each_css(css) { |
|
device_unregister(&css->pseudo_subchannel->dev); |
|
device_unregister(&css->device); |
|
} |
|
bus_unregister(&css_bus_type); |
|
crw_unregister_handler(CRW_RSC_SCH); |
|
idset_free(slow_subchannel_set); |
|
chsc_init_cleanup(); |
|
isc_unregister(IO_SCH_ISC); |
|
} |
|
|
|
static int __init channel_subsystem_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = css_bus_init(); |
|
if (ret) |
|
return ret; |
|
cio_work_q = create_singlethread_workqueue("cio"); |
|
if (!cio_work_q) { |
|
ret = -ENOMEM; |
|
goto out_bus; |
|
} |
|
ret = io_subchannel_init(); |
|
if (ret) |
|
goto out_wq; |
|
|
|
/* Register subchannels which are already in use. */ |
|
cio_register_early_subchannels(); |
|
/* Start initial subchannel evaluation. */ |
|
css_schedule_eval_all(); |
|
|
|
return ret; |
|
out_wq: |
|
destroy_workqueue(cio_work_q); |
|
out_bus: |
|
css_bus_cleanup(); |
|
return ret; |
|
} |
|
subsys_initcall(channel_subsystem_init); |
|
|
|
static int css_settle(struct device_driver *drv, void *unused) |
|
{ |
|
struct css_driver *cssdrv = to_cssdriver(drv); |
|
|
|
if (cssdrv->settle) |
|
return cssdrv->settle(); |
|
return 0; |
|
} |
|
|
|
int css_complete_work(void) |
|
{ |
|
int ret; |
|
|
|
/* Wait for the evaluation of subchannels to finish. */ |
|
ret = wait_event_interruptible(css_eval_wq, |
|
atomic_read(&css_eval_scheduled) == 0); |
|
if (ret) |
|
return -EINTR; |
|
flush_workqueue(cio_work_q); |
|
/* Wait for the subchannel type specific initialization to finish */ |
|
return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); |
|
} |
|
|
|
|
|
/* |
|
* Wait for the initialization of devices to finish, to make sure we are |
|
* done with our setup if the search for the root device starts. |
|
*/ |
|
static int __init channel_subsystem_init_sync(void) |
|
{ |
|
css_complete_work(); |
|
return 0; |
|
} |
|
subsys_initcall_sync(channel_subsystem_init_sync); |
|
|
|
#ifdef CONFIG_PROC_FS |
|
static ssize_t cio_settle_write(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
int ret; |
|
|
|
/* Handle pending CRW's. */ |
|
crw_wait_for_channel_report(); |
|
ret = css_complete_work(); |
|
|
|
return ret ? ret : count; |
|
} |
|
|
|
static const struct proc_ops cio_settle_proc_ops = { |
|
.proc_open = nonseekable_open, |
|
.proc_write = cio_settle_write, |
|
.proc_lseek = no_llseek, |
|
}; |
|
|
|
static int __init cio_settle_init(void) |
|
{ |
|
struct proc_dir_entry *entry; |
|
|
|
entry = proc_create("cio_settle", S_IWUSR, NULL, &cio_settle_proc_ops); |
|
if (!entry) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
device_initcall(cio_settle_init); |
|
#endif /*CONFIG_PROC_FS*/ |
|
|
|
int sch_is_pseudo_sch(struct subchannel *sch) |
|
{ |
|
if (!sch->dev.parent) |
|
return 0; |
|
return sch == to_css(sch->dev.parent)->pseudo_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); |
|
struct css_device_id *id; |
|
|
|
/* When driver_override is set, only bind to the matching driver */ |
|
if (sch->driver_override && strcmp(sch->driver_override, drv->name)) |
|
return 0; |
|
|
|
for (id = driver->subchannel_type; id->match_flags; id++) { |
|
if (sch->st == id->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; |
|
} |
|
|
|
static 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.bus = &css_bus_type; |
|
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);
|
|
|