![Sebastian Ott](/assets/img/avatar_default.png)
Don't use kfree directly after device registration started. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
732 lines
17 KiB
C
732 lines
17 KiB
C
/*
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* drivers/s390/cio/chp.c
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*
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* Copyright IBM Corp. 1999,2007
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* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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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/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 <asm/chpid.h>
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#include <asm/sclp.h>
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#include <asm/crw.h>
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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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#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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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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/* 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_MUTEX(cfg_lock);
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static int cfg_busy;
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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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/* Time after which channel-path status may be outdated. */
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static unsigned long chp_info_expires;
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/* Workqueue to perform pending configure tasks. */
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static struct workqueue_struct *chp_wq;
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static struct work_struct cfg_work;
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/* Wait queue for configure completion events. */
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static wait_queue_head_t cfg_wait_queue;
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/* Return channel_path struct for given chpid. */
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static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
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{
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return channel_subsystems[chpid.cssid]->chps[chpid.id];
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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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/* On succes 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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* 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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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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* 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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* 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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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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status = chp_get_status(chpid);
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if (!on && !status)
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return 0;
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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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* Channel measurement related functions
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*/
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static ssize_t chp_measurement_chars_read(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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device = container_of(kobj, struct device, kobj);
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chp = to_channelpath(device);
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if (!chp->cmg_chars)
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return 0;
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return memory_read_from_buffer(buf, count, &off,
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chp->cmg_chars, sizeof(struct cmg_chars));
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}
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static 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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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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static ssize_t chp_measurement_read(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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device = container_of(kobj, struct device, kobj);
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chp = to_channelpath(device);
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css = to_css(chp->dev.parent);
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size = sizeof(struct cmg_entry);
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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 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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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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int chp_add_cmg_attr(struct channel_path *chp)
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{
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int ret;
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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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* 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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if (!chp)
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return 0;
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return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") :
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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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num_args = sscanf(buf, "%5s", cmd);
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if (!num_args)
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return count;
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if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1"))
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error = s390_vary_chpid(cp->chpid, 1);
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else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0"))
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error = s390_vary_chpid(cp->chpid, 0);
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else
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error = -EINVAL;
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return error < 0 ? error : count;
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}
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static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
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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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return snprintf(buf, PAGE_SIZE, "%d\n", status);
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}
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static int cfg_wait_idle(void);
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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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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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return count;
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}
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static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write);
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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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if (!chp)
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return 0;
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return sprintf(buf, "%x\n", chp->desc.desc);
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}
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static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
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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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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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static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
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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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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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static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
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static struct attribute *chp_attrs[] = {
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&dev_attr_status.attr,
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&dev_attr_configure.attr,
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&dev_attr_type.attr,
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&dev_attr_cmg.attr,
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&dev_attr_shared.attr,
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NULL,
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};
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static struct attribute_group chp_attr_group = {
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.attrs = chp_attrs,
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};
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static void chp_release(struct device *dev)
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{
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struct channel_path *cp;
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cp = to_channelpath(dev);
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kfree(cp);
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}
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/**
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* chp_new - register a new channel-path
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* @chpid - channel-path ID
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*
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* Create and register data structure representing new channel-path. Return
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* zero on success, non-zero otherwise.
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*/
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int chp_new(struct chp_id chpid)
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{
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struct channel_path *chp;
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int ret;
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if (chp_is_registered(chpid))
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return 0;
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chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
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if (!chp)
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return -ENOMEM;
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/* fill in status, etc. */
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chp->chpid = chpid;
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chp->state = 1;
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chp->dev.parent = &channel_subsystems[chpid.cssid]->device;
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chp->dev.release = chp_release;
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dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id);
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/* Obtain channel path description and fill it in. */
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ret = chsc_determine_base_channel_path_desc(chpid, &chp->desc);
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if (ret)
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goto out_free;
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if ((chp->desc.flags & 0x80) == 0) {
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ret = -ENODEV;
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goto out_free;
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}
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/* Get channel-measurement characteristics. */
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if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {
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ret = chsc_get_channel_measurement_chars(chp);
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if (ret)
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goto out_free;
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} else {
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chp->cmg = -1;
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}
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/* make it known to the system */
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ret = device_register(&chp->dev);
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if (ret) {
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CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n",
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chpid.cssid, chpid.id, ret);
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put_device(&chp->dev);
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goto out;
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}
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ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
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if (ret) {
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device_unregister(&chp->dev);
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goto out;
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}
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mutex_lock(&channel_subsystems[chpid.cssid]->mutex);
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if (channel_subsystems[chpid.cssid]->cm_enabled) {
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ret = chp_add_cmg_attr(chp);
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if (ret) {
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sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
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device_unregister(&chp->dev);
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mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
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goto out;
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}
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}
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channel_subsystems[chpid.cssid]->chps[chpid.id] = chp;
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mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
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goto out;
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out_free:
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kfree(chp);
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out:
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return ret;
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}
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/**
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* chp_get_chp_desc - return newly allocated channel-path description
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* @chpid: channel-path ID
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*
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* On success return a newly allocated copy of the channel-path description
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* data associated with the given channel-path ID. Return %NULL on error.
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*/
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void *chp_get_chp_desc(struct chp_id chpid)
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{
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struct channel_path *chp;
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struct channel_path_desc *desc;
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chp = chpid_to_chp(chpid);
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if (!chp)
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return NULL;
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desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
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if (!desc)
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return NULL;
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memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
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return desc;
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}
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/**
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* chp_process_crw - process channel-path status change
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* @crw0: channel report-word to handler
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* @crw1: second channel-report word (always NULL)
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* @overflow: crw overflow indication
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*
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* Handle channel-report-words indicating that the status of a channel-path
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* has changed.
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*/
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static void chp_process_crw(struct crw *crw0, struct crw *crw1,
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int overflow)
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{
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struct chp_id chpid;
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if (overflow) {
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css_schedule_eval_all();
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return;
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}
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CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
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"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
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crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
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crw0->erc, crw0->rsid);
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/*
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* Check for solicited machine checks. These are
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* created by reset channel path and need not be
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* handled here.
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*/
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if (crw0->slct) {
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CIO_CRW_EVENT(2, "solicited machine check for "
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"channel path %02X\n", crw0->rsid);
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return;
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}
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chp_id_init(&chpid);
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chpid.id = crw0->rsid;
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switch (crw0->erc) {
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case CRW_ERC_IPARM: /* Path has come. */
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if (!chp_is_registered(chpid))
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chp_new(chpid);
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chsc_chp_online(chpid);
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break;
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case CRW_ERC_PERRI: /* Path has gone. */
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case CRW_ERC_PERRN:
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chsc_chp_offline(chpid);
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break;
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default:
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CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n",
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|
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;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
mutex_lock(&cfg_lock);
|
|
t = cfg_none;
|
|
chp_id_for_each(&chpid) {
|
|
t = cfg_get_task(chpid);
|
|
if (t != cfg_none) {
|
|
cfg_set_task(chpid, cfg_none);
|
|
break;
|
|
}
|
|
}
|
|
mutex_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();
|
|
mutex_lock(&cfg_lock);
|
|
cfg_busy = 0;
|
|
mutex_unlock(&cfg_lock);
|
|
wake_up_interruptible(&cfg_wait_queue);
|
|
return;
|
|
}
|
|
queue_work(chp_wq, &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);
|
|
mutex_lock(&cfg_lock);
|
|
cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure);
|
|
cfg_busy = 1;
|
|
mutex_unlock(&cfg_lock);
|
|
queue_work(chp_wq, &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);
|
|
mutex_lock(&cfg_lock);
|
|
if (cfg_get_task(chpid) == cfg_deconfigure)
|
|
cfg_set_task(chpid, cfg_none);
|
|
mutex_unlock(&cfg_lock);
|
|
}
|
|
|
|
static int cfg_wait_idle(void)
|
|
{
|
|
if (wait_event_interruptible(cfg_wait_queue, !cfg_busy))
|
|
return -ERESTARTSYS;
|
|
return 0;
|
|
}
|
|
|
|
static int __init chp_init(void)
|
|
{
|
|
struct chp_id chpid;
|
|
int ret;
|
|
|
|
ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw);
|
|
if (ret)
|
|
return ret;
|
|
chp_wq = create_singlethread_workqueue("cio_chp");
|
|
if (!chp_wq) {
|
|
crw_unregister_handler(CRW_RSC_CPATH);
|
|
return -ENOMEM;
|
|
}
|
|
INIT_WORK(&cfg_work, cfg_func);
|
|
init_waitqueue_head(&cfg_wait_queue);
|
|
if (info_update())
|
|
return 0;
|
|
/* Register available channel-paths. */
|
|
chp_id_for_each(&chpid) {
|
|
if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED)
|
|
chp_new(chpid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(chp_init);
|