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path: root/drivers/s390/cio/chp.c
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Diffstat (limited to 'drivers/s390/cio/chp.c')
-rw-r--r--drivers/s390/cio/chp.c683
1 files changed, 683 insertions, 0 deletions
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
new file mode 100644
index 00000000000..ac289e6eadf
--- /dev/null
+++ b/drivers/s390/cio/chp.c
@@ -0,0 +1,683 @@
+/*
+ * drivers/s390/cio/chp.c
+ *
+ * Copyright IBM Corp. 1999,2007
+ * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
+ * Arnd Bergmann (arndb@de.ibm.com)
+ * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
+ */
+
+#include <linux/bug.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/wait.h>
+#include <linux/mutex.h>
+#include <asm/errno.h>
+#include <asm/chpid.h>
+#include <asm/sclp.h>
+
+#include "cio.h"
+#include "css.h"
+#include "ioasm.h"
+#include "cio_debug.h"
+#include "chp.h"
+
+#define to_channelpath(device) container_of(device, struct channel_path, dev)
+#define CHP_INFO_UPDATE_INTERVAL 1*HZ
+
+enum cfg_task_t {
+ cfg_none,
+ cfg_configure,
+ cfg_deconfigure
+};
+
+/* Map for pending configure tasks. */
+static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1];
+static DEFINE_MUTEX(cfg_lock);
+static int cfg_busy;
+
+/* Map for channel-path status. */
+static struct sclp_chp_info chp_info;
+static DEFINE_MUTEX(info_lock);
+
+/* Time after which channel-path status may be outdated. */
+static unsigned long chp_info_expires;
+
+/* Workqueue to perform pending configure tasks. */
+static struct workqueue_struct *chp_wq;
+static struct work_struct cfg_work;
+
+/* Wait queue for configure completion events. */
+static wait_queue_head_t cfg_wait_queue;
+
+/* Return channel_path struct for given chpid. */
+static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
+{
+ return css[chpid.cssid]->chps[chpid.id];
+}
+
+/* Set vary state for given chpid. */
+static void set_chp_logically_online(struct chp_id chpid, int onoff)
+{
+ chpid_to_chp(chpid)->state = onoff;
+}
+
+/* On succes return 0 if channel-path is varied offline, 1 if it is varied
+ * online. Return -ENODEV if channel-path is not registered. */
+int chp_get_status(struct chp_id chpid)
+{
+ return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV);
+}
+
+/**
+ * chp_get_sch_opm - return opm for subchannel
+ * @sch: subchannel
+ *
+ * Calculate and return the operational path mask (opm) based on the chpids
+ * used by the subchannel and the status of the associated channel-paths.
+ */
+u8 chp_get_sch_opm(struct subchannel *sch)
+{
+ struct chp_id chpid;
+ int opm;
+ int i;
+
+ opm = 0;
+ chp_id_init(&chpid);
+ for (i=0; i < 8; i++) {
+ opm <<= 1;
+ chpid.id = sch->schib.pmcw.chpid[i];
+ if (chp_get_status(chpid) != 0)
+ opm |= 1;
+ }
+ return opm;
+}
+
+/**
+ * chp_is_registered - check if a channel-path is registered
+ * @chpid: channel-path ID
+ *
+ * Return non-zero if a channel-path with the given chpid is registered,
+ * zero otherwise.
+ */
+int chp_is_registered(struct chp_id chpid)
+{
+ return chpid_to_chp(chpid) != NULL;
+}
+
+/*
+ * Function: s390_vary_chpid
+ * Varies the specified chpid online or offline
+ */
+static int s390_vary_chpid(struct chp_id chpid, int on)
+{
+ char dbf_text[15];
+ int status;
+
+ sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid,
+ chpid.id);
+ CIO_TRACE_EVENT( 2, dbf_text);
+
+ status = chp_get_status(chpid);
+ if (status < 0) {
+ printk(KERN_ERR "Can't vary unknown chpid %x.%02x\n",
+ chpid.cssid, chpid.id);
+ return -EINVAL;
+ }
+
+ if (!on && !status) {
+ printk(KERN_ERR "chpid %x.%02x is already offline\n",
+ chpid.cssid, chpid.id);
+ return -EINVAL;
+ }
+
+ set_chp_logically_online(chpid, on);
+ chsc_chp_vary(chpid, on);
+ return 0;
+}
+
+/*
+ * Channel measurement related functions
+ */
+static ssize_t chp_measurement_chars_read(struct kobject *kobj, char *buf,
+ loff_t off, size_t count)
+{
+ struct channel_path *chp;
+ unsigned int size;
+
+ chp = to_channelpath(container_of(kobj, struct device, kobj));
+ if (!chp->cmg_chars)
+ return 0;
+
+ size = sizeof(struct cmg_chars);
+
+ if (off > size)
+ return 0;
+ if (off + count > size)
+ count = size - off;
+ memcpy(buf, chp->cmg_chars + off, count);
+ return count;
+}
+
+static struct bin_attribute chp_measurement_chars_attr = {
+ .attr = {
+ .name = "measurement_chars",
+ .mode = S_IRUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = sizeof(struct cmg_chars),
+ .read = chp_measurement_chars_read,
+};
+
+static void chp_measurement_copy_block(struct cmg_entry *buf,
+ struct channel_subsystem *css,
+ struct chp_id chpid)
+{
+ void *area;
+ struct cmg_entry *entry, reference_buf;
+ int idx;
+
+ if (chpid.id < 128) {
+ area = css->cub_addr1;
+ idx = chpid.id;
+ } else {
+ area = css->cub_addr2;
+ idx = chpid.id - 128;
+ }
+ entry = area + (idx * sizeof(struct cmg_entry));
+ do {
+ memcpy(buf, entry, sizeof(*entry));
+ memcpy(&reference_buf, entry, sizeof(*entry));
+ } while (reference_buf.values[0] != buf->values[0]);
+}
+
+static ssize_t chp_measurement_read(struct kobject *kobj, char *buf,
+ loff_t off, size_t count)
+{
+ struct channel_path *chp;
+ struct channel_subsystem *css;
+ unsigned int size;
+
+ chp = to_channelpath(container_of(kobj, struct device, kobj));
+ css = to_css(chp->dev.parent);
+
+ size = sizeof(struct cmg_entry);
+
+ /* Only allow single reads. */
+ if (off || count < size)
+ return 0;
+ chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid);
+ count = size;
+ return count;
+}
+
+static struct bin_attribute chp_measurement_attr = {
+ .attr = {
+ .name = "measurement",
+ .mode = S_IRUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = sizeof(struct cmg_entry),
+ .read = chp_measurement_read,
+};
+
+void chp_remove_cmg_attr(struct channel_path *chp)
+{
+ device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
+ device_remove_bin_file(&chp->dev, &chp_measurement_attr);
+}
+
+int chp_add_cmg_attr(struct channel_path *chp)
+{
+ int ret;
+
+ ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr);
+ if (ret)
+ return ret;
+ ret = device_create_bin_file(&chp->dev, &chp_measurement_attr);
+ if (ret)
+ device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
+ return ret;
+}
+
+/*
+ * Files for the channel path entries.
+ */
+static ssize_t chp_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct channel_path *chp = container_of(dev, struct channel_path, dev);
+
+ if (!chp)
+ return 0;
+ return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") :
+ sprintf(buf, "offline\n"));
+}
+
+static ssize_t chp_status_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct channel_path *cp = container_of(dev, struct channel_path, dev);
+ char cmd[10];
+ int num_args;
+ int error;
+
+ num_args = sscanf(buf, "%5s", cmd);
+ if (!num_args)
+ return count;
+
+ if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1"))
+ error = s390_vary_chpid(cp->chpid, 1);
+ else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0"))
+ error = s390_vary_chpid(cp->chpid, 0);
+ else
+ error = -EINVAL;
+
+ return error < 0 ? error : count;
+
+}
+
+static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
+
+static ssize_t chp_configure_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct channel_path *cp;
+ int status;
+
+ cp = container_of(dev, struct channel_path, dev);
+ status = chp_info_get_status(cp->chpid);
+ if (status < 0)
+ return status;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", status);
+}
+
+static int cfg_wait_idle(void);
+
+static ssize_t chp_configure_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct channel_path *cp;
+ int val;
+ char delim;
+
+ if (sscanf(buf, "%d %c", &val, &delim) != 1)
+ return -EINVAL;
+ if (val != 0 && val != 1)
+ return -EINVAL;
+ cp = container_of(dev, struct channel_path, dev);
+ chp_cfg_schedule(cp->chpid, val);
+ cfg_wait_idle();
+
+ return count;
+}
+
+static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write);
+
+static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct channel_path *chp = container_of(dev, struct channel_path, dev);
+
+ if (!chp)
+ return 0;
+ return sprintf(buf, "%x\n", chp->desc.desc);
+}
+
+static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
+
+static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct channel_path *chp = to_channelpath(dev);
+
+ if (!chp)
+ return 0;
+ if (chp->cmg == -1) /* channel measurements not available */
+ return sprintf(buf, "unknown\n");
+ return sprintf(buf, "%x\n", chp->cmg);
+}
+
+static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
+
+static ssize_t chp_shared_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct channel_path *chp = to_channelpath(dev);
+
+ if (!chp)
+ return 0;
+ if (chp->shared == -1) /* channel measurements not available */
+ return sprintf(buf, "unknown\n");
+ return sprintf(buf, "%x\n", chp->shared);
+}
+
+static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
+
+static struct attribute * chp_attrs[] = {
+ &dev_attr_status.attr,
+ &dev_attr_configure.attr,
+ &dev_attr_type.attr,
+ &dev_attr_cmg.attr,
+ &dev_attr_shared.attr,
+ NULL,
+};
+
+static struct attribute_group chp_attr_group = {
+ .attrs = chp_attrs,
+};
+
+static void chp_release(struct device *dev)
+{
+ struct channel_path *cp;
+
+ cp = container_of(dev, struct channel_path, dev);
+ kfree(cp);
+}
+
+/**
+ * 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_path *chp;
+ int ret;
+
+ if (chp_is_registered(chpid))
+ return 0;
+ chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
+ if (!chp)
+ return -ENOMEM;
+
+ /* fill in status, etc. */
+ chp->chpid = chpid;
+ chp->state = 1;
+ chp->dev.parent = &css[chpid.cssid]->device;
+ chp->dev.release = chp_release;
+ snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid,
+ chpid.id);
+
+ /* Obtain channel path description and fill it in. */
+ ret = chsc_determine_channel_path_description(chpid, &chp->desc);
+ if (ret)
+ goto out_free;
+ if ((chp->desc.flags & 0x80) == 0) {
+ ret = -ENODEV;
+ goto out_free;
+ }
+ /* Get channel-measurement characteristics. */
+ if (css_characteristics_avail && css_chsc_characteristics.scmc
+ && css_chsc_characteristics.secm) {
+ ret = chsc_get_channel_measurement_chars(chp);
+ if (ret)
+ goto out_free;
+ } else {
+ static int msg_done;
+
+ if (!msg_done) {
+ printk(KERN_WARNING "cio: Channel measurements not "
+ "available, continuing.\n");
+ msg_done = 1;
+ }
+ chp->cmg = -1;
+ }
+
+ /* make it known to the system */
+ ret = device_register(&chp->dev);
+ if (ret) {
+ printk(KERN_WARNING "%s: could not register %x.%02x\n",
+ __func__, chpid.cssid, chpid.id);
+ goto out_free;
+ }
+ ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
+ if (ret) {
+ device_unregister(&chp->dev);
+ goto out_free;
+ }
+ mutex_lock(&css[chpid.cssid]->mutex);
+ if (css[chpid.cssid]->cm_enabled) {
+ ret = chp_add_cmg_attr(chp);
+ if (ret) {
+ sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
+ device_unregister(&chp->dev);
+ mutex_unlock(&css[chpid.cssid]->mutex);
+ goto out_free;
+ }
+ }
+ css[chpid.cssid]->chps[chpid.id] = chp;
+ mutex_unlock(&css[chpid.cssid]->mutex);
+ return ret;
+out_free:
+ kfree(chp);
+ 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.
+ */
+void *chp_get_chp_desc(struct chp_id chpid)
+{
+ struct channel_path *chp;
+ struct channel_path_desc *desc;
+
+ chp = chpid_to_chp(chpid);
+ if (!chp)
+ return NULL;
+ desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
+ if (!desc)
+ return NULL;
+ memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
+ return desc;
+}
+
+/**
+ * chp_process_crw - process channel-path status change
+ * @id: channel-path ID number
+ * @status: non-zero if channel-path has become available, zero otherwise
+ *
+ * Handle channel-report-words indicating that the status of a channel-path
+ * has changed.
+ */
+void chp_process_crw(int id, int status)
+{
+ struct chp_id chpid;
+
+ chp_id_init(&chpid);
+ chpid.id = id;
+ if (status) {
+ if (!chp_is_registered(chpid))
+ chp_new(chpid);
+ chsc_chp_online(chpid);
+ } else
+ chsc_chp_offline(chpid);
+}
+
+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;
+
+ 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:
+ sclp_chp_configure(chpid);
+ info_expire();
+ chsc_chp_online(chpid);
+ break;
+ case cfg_deconfigure:
+ sclp_chp_deconfigure(chpid);
+ 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;
+
+ chp_wq = create_singlethread_workqueue("cio_chp");
+ if (!chp_wq)
+ 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);