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848 lines
20 KiB
848 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright IBM Corp. 1999, 2010 |
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* Author(s): Cornelia Huck ([email protected]) |
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* Arnd Bergmann ([email protected]) |
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* Peter Oberparleiter <[email protected]> |
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*/ |
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|
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#include <linux/bug.h> |
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#include <linux/workqueue.h> |
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#include <linux/spinlock.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/init.h> |
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#include <linux/jiffies.h> |
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#include <linux/wait.h> |
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#include <linux/mutex.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <asm/chpid.h> |
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#include <asm/sclp.h> |
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#include <asm/crw.h> |
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|
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#include "cio.h" |
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#include "css.h" |
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#include "ioasm.h" |
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#include "cio_debug.h" |
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#include "chp.h" |
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|
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#define to_channelpath(device) container_of(device, struct channel_path, dev) |
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#define CHP_INFO_UPDATE_INTERVAL 1*HZ |
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|
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enum cfg_task_t { |
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cfg_none, |
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cfg_configure, |
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cfg_deconfigure |
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}; |
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|
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/* Map for pending configure tasks. */ |
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static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; |
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static DEFINE_SPINLOCK(cfg_lock); |
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|
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/* Map for channel-path status. */ |
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static struct sclp_chp_info chp_info; |
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static DEFINE_MUTEX(info_lock); |
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|
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/* Time after which channel-path status may be outdated. */ |
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static unsigned long chp_info_expires; |
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|
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static struct work_struct cfg_work; |
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|
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/* Wait queue for configure completion events. */ |
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static DECLARE_WAIT_QUEUE_HEAD(cfg_wait_queue); |
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|
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/* Set vary state for given chpid. */ |
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static void set_chp_logically_online(struct chp_id chpid, int onoff) |
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{ |
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chpid_to_chp(chpid)->state = onoff; |
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} |
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|
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/* On success return 0 if channel-path is varied offline, 1 if it is varied |
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* online. Return -ENODEV if channel-path is not registered. */ |
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int chp_get_status(struct chp_id chpid) |
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{ |
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return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); |
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} |
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|
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/** |
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* chp_get_sch_opm - return opm for subchannel |
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* @sch: subchannel |
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* |
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* Calculate and return the operational path mask (opm) based on the chpids |
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* used by the subchannel and the status of the associated channel-paths. |
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*/ |
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u8 chp_get_sch_opm(struct subchannel *sch) |
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{ |
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struct chp_id chpid; |
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int opm; |
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int i; |
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|
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opm = 0; |
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chp_id_init(&chpid); |
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for (i = 0; i < 8; i++) { |
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opm <<= 1; |
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chpid.id = sch->schib.pmcw.chpid[i]; |
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if (chp_get_status(chpid) != 0) |
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opm |= 1; |
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} |
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return opm; |
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} |
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EXPORT_SYMBOL_GPL(chp_get_sch_opm); |
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|
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/** |
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* chp_is_registered - check if a channel-path is registered |
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* @chpid: channel-path ID |
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* |
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* Return non-zero if a channel-path with the given chpid is registered, |
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* zero otherwise. |
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*/ |
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int chp_is_registered(struct chp_id chpid) |
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{ |
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return chpid_to_chp(chpid) != NULL; |
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} |
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|
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/* |
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* Function: s390_vary_chpid |
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* Varies the specified chpid online or offline |
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*/ |
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static int s390_vary_chpid(struct chp_id chpid, int on) |
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{ |
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char dbf_text[15]; |
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int status; |
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|
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sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, |
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chpid.id); |
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CIO_TRACE_EVENT(2, dbf_text); |
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|
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status = chp_get_status(chpid); |
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if (!on && !status) |
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return 0; |
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|
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set_chp_logically_online(chpid, on); |
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chsc_chp_vary(chpid, on); |
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return 0; |
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} |
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|
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/* |
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* Channel measurement related functions |
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*/ |
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static ssize_t chp_measurement_chars_read(struct file *filp, |
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struct kobject *kobj, |
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struct bin_attribute *bin_attr, |
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char *buf, loff_t off, size_t count) |
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{ |
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struct channel_path *chp; |
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struct device *device; |
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|
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device = kobj_to_dev(kobj); |
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chp = to_channelpath(device); |
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if (chp->cmg == -1) |
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return 0; |
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|
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return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars, |
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sizeof(chp->cmg_chars)); |
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} |
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|
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static const struct bin_attribute chp_measurement_chars_attr = { |
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.attr = { |
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.name = "measurement_chars", |
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.mode = S_IRUSR, |
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}, |
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.size = sizeof(struct cmg_chars), |
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.read = chp_measurement_chars_read, |
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}; |
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|
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static void chp_measurement_copy_block(struct cmg_entry *buf, |
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struct channel_subsystem *css, |
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struct chp_id chpid) |
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{ |
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void *area; |
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struct cmg_entry *entry, reference_buf; |
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int idx; |
|
|
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if (chpid.id < 128) { |
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area = css->cub_addr1; |
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idx = chpid.id; |
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} else { |
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area = css->cub_addr2; |
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idx = chpid.id - 128; |
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} |
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entry = area + (idx * sizeof(struct cmg_entry)); |
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do { |
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memcpy(buf, entry, sizeof(*entry)); |
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memcpy(&reference_buf, entry, sizeof(*entry)); |
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} while (reference_buf.values[0] != buf->values[0]); |
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} |
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|
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static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, |
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char *buf, loff_t off, size_t count) |
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{ |
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struct channel_path *chp; |
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struct channel_subsystem *css; |
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struct device *device; |
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unsigned int size; |
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|
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device = kobj_to_dev(kobj); |
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chp = to_channelpath(device); |
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css = to_css(chp->dev.parent); |
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|
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size = sizeof(struct cmg_entry); |
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|
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/* Only allow single reads. */ |
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if (off || count < size) |
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return 0; |
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chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); |
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count = size; |
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return count; |
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} |
|
|
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static const struct bin_attribute chp_measurement_attr = { |
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.attr = { |
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.name = "measurement", |
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.mode = S_IRUSR, |
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}, |
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.size = sizeof(struct cmg_entry), |
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.read = chp_measurement_read, |
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}; |
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|
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void chp_remove_cmg_attr(struct channel_path *chp) |
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{ |
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device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
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device_remove_bin_file(&chp->dev, &chp_measurement_attr); |
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} |
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|
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int chp_add_cmg_attr(struct channel_path *chp) |
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{ |
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int ret; |
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|
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ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); |
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if (ret) |
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return ret; |
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ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); |
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if (ret) |
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device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
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return ret; |
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} |
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|
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/* |
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* Files for the channel path entries. |
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*/ |
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static ssize_t chp_status_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct channel_path *chp = to_channelpath(dev); |
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int status; |
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|
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mutex_lock(&chp->lock); |
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status = chp->state; |
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mutex_unlock(&chp->lock); |
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|
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return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); |
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} |
|
|
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static ssize_t chp_status_write(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 channel_path *cp = to_channelpath(dev); |
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char cmd[10]; |
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int num_args; |
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int error; |
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|
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num_args = sscanf(buf, "%5s", cmd); |
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if (!num_args) |
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return count; |
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|
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/* Wait until previous actions have settled. */ |
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css_wait_for_slow_path(); |
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|
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if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { |
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mutex_lock(&cp->lock); |
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error = s390_vary_chpid(cp->chpid, 1); |
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mutex_unlock(&cp->lock); |
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} else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { |
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mutex_lock(&cp->lock); |
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error = s390_vary_chpid(cp->chpid, 0); |
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mutex_unlock(&cp->lock); |
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} else |
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error = -EINVAL; |
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|
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return error < 0 ? error : count; |
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} |
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|
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static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); |
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|
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static ssize_t chp_configure_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct channel_path *cp; |
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int status; |
|
|
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cp = to_channelpath(dev); |
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status = chp_info_get_status(cp->chpid); |
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if (status < 0) |
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return status; |
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|
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return sysfs_emit(buf, "%d\n", status); |
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} |
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|
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static int cfg_wait_idle(void); |
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|
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static ssize_t chp_configure_write(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 channel_path *cp; |
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int val; |
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char delim; |
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|
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if (sscanf(buf, "%d %c", &val, &delim) != 1) |
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return -EINVAL; |
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if (val != 0 && val != 1) |
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return -EINVAL; |
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cp = to_channelpath(dev); |
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chp_cfg_schedule(cp->chpid, val); |
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cfg_wait_idle(); |
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|
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return count; |
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} |
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|
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static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); |
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|
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static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct channel_path *chp = to_channelpath(dev); |
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u8 type; |
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|
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mutex_lock(&chp->lock); |
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type = chp->desc.desc; |
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mutex_unlock(&chp->lock); |
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return sprintf(buf, "%x\n", type); |
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} |
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|
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static DEVICE_ATTR(type, 0444, chp_type_show, NULL); |
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|
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static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct channel_path *chp = to_channelpath(dev); |
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|
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if (!chp) |
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return 0; |
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if (chp->cmg == -1) /* channel measurements not available */ |
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return sprintf(buf, "unknown\n"); |
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return sprintf(buf, "%x\n", chp->cmg); |
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} |
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|
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static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); |
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|
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static ssize_t chp_shared_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct channel_path *chp = to_channelpath(dev); |
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|
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if (!chp) |
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return 0; |
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if (chp->shared == -1) /* channel measurements not available */ |
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return sprintf(buf, "unknown\n"); |
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return sprintf(buf, "%x\n", chp->shared); |
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} |
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|
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static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); |
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|
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static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct channel_path *chp = to_channelpath(dev); |
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ssize_t rc; |
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|
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mutex_lock(&chp->lock); |
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if (chp->desc_fmt1.flags & 0x10) |
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rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); |
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else |
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rc = 0; |
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mutex_unlock(&chp->lock); |
|
|
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return rc; |
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} |
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static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); |
|
|
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static ssize_t chp_chid_external_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct channel_path *chp = to_channelpath(dev); |
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ssize_t rc; |
|
|
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mutex_lock(&chp->lock); |
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if (chp->desc_fmt1.flags & 0x10) |
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rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); |
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else |
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rc = 0; |
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mutex_unlock(&chp->lock); |
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|
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return rc; |
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} |
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static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); |
|
|
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static ssize_t chp_esc_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct channel_path *chp = to_channelpath(dev); |
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ssize_t rc; |
|
|
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mutex_lock(&chp->lock); |
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rc = sprintf(buf, "%x\n", chp->desc_fmt1.esc); |
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mutex_unlock(&chp->lock); |
|
|
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return rc; |
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} |
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static DEVICE_ATTR(esc, 0444, chp_esc_show, NULL); |
|
|
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static ssize_t util_string_read(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *attr, char *buf, |
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loff_t off, size_t count) |
|
{ |
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struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); |
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ssize_t rc; |
|
|
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mutex_lock(&chp->lock); |
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rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str, |
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sizeof(chp->desc_fmt3.util_str)); |
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mutex_unlock(&chp->lock); |
|
|
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return rc; |
|
} |
|
static BIN_ATTR_RO(util_string, |
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sizeof(((struct channel_path_desc_fmt3 *)0)->util_str)); |
|
|
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static struct bin_attribute *chp_bin_attrs[] = { |
|
&bin_attr_util_string, |
|
NULL, |
|
}; |
|
|
|
static struct attribute *chp_attrs[] = { |
|
&dev_attr_status.attr, |
|
&dev_attr_configure.attr, |
|
&dev_attr_type.attr, |
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&dev_attr_cmg.attr, |
|
&dev_attr_shared.attr, |
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&dev_attr_chid.attr, |
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&dev_attr_chid_external.attr, |
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&dev_attr_esc.attr, |
|
NULL, |
|
}; |
|
static struct attribute_group chp_attr_group = { |
|
.attrs = chp_attrs, |
|
.bin_attrs = chp_bin_attrs, |
|
}; |
|
static const struct attribute_group *chp_attr_groups[] = { |
|
&chp_attr_group, |
|
NULL, |
|
}; |
|
|
|
static void chp_release(struct device *dev) |
|
{ |
|
struct channel_path *cp; |
|
|
|
cp = to_channelpath(dev); |
|
kfree(cp); |
|
} |
|
|
|
/** |
|
* chp_update_desc - update channel-path description |
|
* @chp: channel-path |
|
* |
|
* Update the channel-path description of the specified channel-path |
|
* including channel measurement related information. |
|
* Return zero on success, non-zero otherwise. |
|
*/ |
|
int chp_update_desc(struct channel_path *chp) |
|
{ |
|
int rc; |
|
|
|
rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc); |
|
if (rc) |
|
return rc; |
|
|
|
/* |
|
* Fetching the following data is optional. Not all machines or |
|
* hypervisors implement the required chsc commands. |
|
*/ |
|
chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); |
|
chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3); |
|
chsc_get_channel_measurement_chars(chp); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* chp_new - register a new channel-path |
|
* @chpid: channel-path ID |
|
* |
|
* Create and register data structure representing new channel-path. Return |
|
* zero on success, non-zero otherwise. |
|
*/ |
|
int chp_new(struct chp_id chpid) |
|
{ |
|
struct channel_subsystem *css = css_by_id(chpid.cssid); |
|
struct channel_path *chp; |
|
int ret = 0; |
|
|
|
mutex_lock(&css->mutex); |
|
if (chp_is_registered(chpid)) |
|
goto out; |
|
|
|
chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
|
if (!chp) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
/* fill in status, etc. */ |
|
chp->chpid = chpid; |
|
chp->state = 1; |
|
chp->dev.parent = &css->device; |
|
chp->dev.groups = chp_attr_groups; |
|
chp->dev.release = chp_release; |
|
mutex_init(&chp->lock); |
|
|
|
/* Obtain channel path description and fill it in. */ |
|
ret = chp_update_desc(chp); |
|
if (ret) |
|
goto out_free; |
|
if ((chp->desc.flags & 0x80) == 0) { |
|
ret = -ENODEV; |
|
goto out_free; |
|
} |
|
dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); |
|
|
|
/* make it known to the system */ |
|
ret = device_register(&chp->dev); |
|
if (ret) { |
|
CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
|
chpid.cssid, chpid.id, ret); |
|
put_device(&chp->dev); |
|
goto out; |
|
} |
|
|
|
if (css->cm_enabled) { |
|
ret = chp_add_cmg_attr(chp); |
|
if (ret) { |
|
device_unregister(&chp->dev); |
|
goto out; |
|
} |
|
} |
|
css->chps[chpid.id] = chp; |
|
goto out; |
|
out_free: |
|
kfree(chp); |
|
out: |
|
mutex_unlock(&css->mutex); |
|
return ret; |
|
} |
|
|
|
/** |
|
* chp_get_chp_desc - return newly allocated channel-path description |
|
* @chpid: channel-path ID |
|
* |
|
* On success return a newly allocated copy of the channel-path description |
|
* data associated with the given channel-path ID. Return %NULL on error. |
|
*/ |
|
struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid) |
|
{ |
|
struct channel_path *chp; |
|
struct channel_path_desc_fmt0 *desc; |
|
|
|
chp = chpid_to_chp(chpid); |
|
if (!chp) |
|
return NULL; |
|
desc = kmalloc(sizeof(*desc), GFP_KERNEL); |
|
if (!desc) |
|
return NULL; |
|
|
|
mutex_lock(&chp->lock); |
|
memcpy(desc, &chp->desc, sizeof(*desc)); |
|
mutex_unlock(&chp->lock); |
|
return desc; |
|
} |
|
|
|
/** |
|
* chp_process_crw - process channel-path status change |
|
* @crw0: channel report-word to handler |
|
* @crw1: second channel-report word (always NULL) |
|
* @overflow: crw overflow indication |
|
* |
|
* Handle channel-report-words indicating that the status of a channel-path |
|
* has changed. |
|
*/ |
|
static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
|
int overflow) |
|
{ |
|
struct chp_id chpid; |
|
|
|
if (overflow) { |
|
css_schedule_eval_all(); |
|
return; |
|
} |
|
CIO_CRW_EVENT(2, "CRW 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); |
|
/* |
|
* Check for solicited machine checks. These are |
|
* created by reset channel path and need not be |
|
* handled here. |
|
*/ |
|
if (crw0->slct) { |
|
CIO_CRW_EVENT(2, "solicited machine check for " |
|
"channel path %02X\n", crw0->rsid); |
|
return; |
|
} |
|
chp_id_init(&chpid); |
|
chpid.id = crw0->rsid; |
|
switch (crw0->erc) { |
|
case CRW_ERC_IPARM: /* Path has come. */ |
|
case CRW_ERC_INIT: |
|
chp_new(chpid); |
|
chsc_chp_online(chpid); |
|
break; |
|
case CRW_ERC_PERRI: /* Path has gone. */ |
|
case CRW_ERC_PERRN: |
|
chsc_chp_offline(chpid); |
|
break; |
|
default: |
|
CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", |
|
crw0->erc); |
|
} |
|
} |
|
|
|
int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
|
{ |
|
int i; |
|
int mask; |
|
|
|
for (i = 0; i < 8; i++) { |
|
mask = 0x80 >> i; |
|
if (!(ssd->path_mask & mask)) |
|
continue; |
|
if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
|
continue; |
|
if ((ssd->fla_valid_mask & mask) && |
|
((ssd->fla[i] & link->fla_mask) != link->fla)) |
|
continue; |
|
return mask; |
|
} |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(chp_ssd_get_mask); |
|
|
|
static inline int info_bit_num(struct chp_id id) |
|
{ |
|
return id.id + id.cssid * (__MAX_CHPID + 1); |
|
} |
|
|
|
/* Force chp_info refresh on next call to info_validate(). */ |
|
static void info_expire(void) |
|
{ |
|
mutex_lock(&info_lock); |
|
chp_info_expires = jiffies - 1; |
|
mutex_unlock(&info_lock); |
|
} |
|
|
|
/* Ensure that chp_info is up-to-date. */ |
|
static int info_update(void) |
|
{ |
|
int rc; |
|
|
|
mutex_lock(&info_lock); |
|
rc = 0; |
|
if (time_after(jiffies, chp_info_expires)) { |
|
/* Data is too old, update. */ |
|
rc = sclp_chp_read_info(&chp_info); |
|
chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; |
|
} |
|
mutex_unlock(&info_lock); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* chp_info_get_status - retrieve configure status of a channel-path |
|
* @chpid: channel-path ID |
|
* |
|
* On success, return 0 for standby, 1 for configured, 2 for reserved, |
|
* 3 for not recognized. Return negative error code on error. |
|
*/ |
|
int chp_info_get_status(struct chp_id chpid) |
|
{ |
|
int rc; |
|
int bit; |
|
|
|
rc = info_update(); |
|
if (rc) |
|
return rc; |
|
|
|
bit = info_bit_num(chpid); |
|
mutex_lock(&info_lock); |
|
if (!chp_test_bit(chp_info.recognized, bit)) |
|
rc = CHP_STATUS_NOT_RECOGNIZED; |
|
else if (chp_test_bit(chp_info.configured, bit)) |
|
rc = CHP_STATUS_CONFIGURED; |
|
else if (chp_test_bit(chp_info.standby, bit)) |
|
rc = CHP_STATUS_STANDBY; |
|
else |
|
rc = CHP_STATUS_RESERVED; |
|
mutex_unlock(&info_lock); |
|
|
|
return rc; |
|
} |
|
|
|
/* Return configure task for chpid. */ |
|
static enum cfg_task_t cfg_get_task(struct chp_id chpid) |
|
{ |
|
return chp_cfg_task[chpid.cssid][chpid.id]; |
|
} |
|
|
|
/* Set configure task for chpid. */ |
|
static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) |
|
{ |
|
chp_cfg_task[chpid.cssid][chpid.id] = cfg; |
|
} |
|
|
|
/* Fetch the first configure task. Set chpid accordingly. */ |
|
static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) |
|
{ |
|
enum cfg_task_t t = cfg_none; |
|
|
|
chp_id_for_each(chpid) { |
|
t = cfg_get_task(*chpid); |
|
if (t != cfg_none) |
|
break; |
|
} |
|
|
|
return t; |
|
} |
|
|
|
/* Perform one configure/deconfigure request. Reschedule work function until |
|
* last request. */ |
|
static void cfg_func(struct work_struct *work) |
|
{ |
|
struct chp_id chpid; |
|
enum cfg_task_t t; |
|
int rc; |
|
|
|
spin_lock(&cfg_lock); |
|
t = chp_cfg_fetch_task(&chpid); |
|
spin_unlock(&cfg_lock); |
|
|
|
switch (t) { |
|
case cfg_configure: |
|
rc = sclp_chp_configure(chpid); |
|
if (rc) |
|
CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" |
|
"%d\n", chpid.cssid, chpid.id, rc); |
|
else { |
|
info_expire(); |
|
chsc_chp_online(chpid); |
|
} |
|
break; |
|
case cfg_deconfigure: |
|
rc = sclp_chp_deconfigure(chpid); |
|
if (rc) |
|
CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" |
|
"%d\n", chpid.cssid, chpid.id, rc); |
|
else { |
|
info_expire(); |
|
chsc_chp_offline(chpid); |
|
} |
|
break; |
|
case cfg_none: |
|
/* Get updated information after last change. */ |
|
info_update(); |
|
wake_up_interruptible(&cfg_wait_queue); |
|
return; |
|
} |
|
spin_lock(&cfg_lock); |
|
if (t == cfg_get_task(chpid)) |
|
cfg_set_task(chpid, cfg_none); |
|
spin_unlock(&cfg_lock); |
|
schedule_work(&cfg_work); |
|
} |
|
|
|
/** |
|
* chp_cfg_schedule - schedule chpid configuration request |
|
* @chpid: channel-path ID |
|
* @configure: Non-zero for configure, zero for deconfigure |
|
* |
|
* Schedule a channel-path configuration/deconfiguration request. |
|
*/ |
|
void chp_cfg_schedule(struct chp_id chpid, int configure) |
|
{ |
|
CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, |
|
configure); |
|
spin_lock(&cfg_lock); |
|
cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); |
|
spin_unlock(&cfg_lock); |
|
schedule_work(&cfg_work); |
|
} |
|
|
|
/** |
|
* chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request |
|
* @chpid: channel-path ID |
|
* |
|
* Cancel an active channel-path deconfiguration request if it has not yet |
|
* been performed. |
|
*/ |
|
void chp_cfg_cancel_deconfigure(struct chp_id chpid) |
|
{ |
|
CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); |
|
spin_lock(&cfg_lock); |
|
if (cfg_get_task(chpid) == cfg_deconfigure) |
|
cfg_set_task(chpid, cfg_none); |
|
spin_unlock(&cfg_lock); |
|
} |
|
|
|
static bool cfg_idle(void) |
|
{ |
|
struct chp_id chpid; |
|
enum cfg_task_t t; |
|
|
|
spin_lock(&cfg_lock); |
|
t = chp_cfg_fetch_task(&chpid); |
|
spin_unlock(&cfg_lock); |
|
|
|
return t == cfg_none; |
|
} |
|
|
|
static int cfg_wait_idle(void) |
|
{ |
|
if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) |
|
return -ERESTARTSYS; |
|
return 0; |
|
} |
|
|
|
static int __init chp_init(void) |
|
{ |
|
struct chp_id chpid; |
|
int state, ret; |
|
|
|
ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); |
|
if (ret) |
|
return ret; |
|
INIT_WORK(&cfg_work, cfg_func); |
|
if (info_update()) |
|
return 0; |
|
/* Register available channel-paths. */ |
|
chp_id_for_each(&chpid) { |
|
state = chp_info_get_status(chpid); |
|
if (state == CHP_STATUS_CONFIGURED || |
|
state == CHP_STATUS_STANDBY) |
|
chp_new(chpid); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
subsys_initcall(chp_init);
|
|
|