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@@ -10,9 +10,14 @@
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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 <asm/errno.h>
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+#include <asm/chpid.h>
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+#include <asm/sclp.h>
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-#include "chpid.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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@@ -20,6 +25,32 @@
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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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+
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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_MUTEX(cfg_lock);
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+static int cfg_busy;
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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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+/* 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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+
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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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@@ -251,6 +282,43 @@ static ssize_t chp_status_write(struct device *dev,
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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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+
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+ cp = container_of(dev, struct channel_path, 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 snprintf(buf, PAGE_SIZE, "%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 = container_of(dev, struct channel_path, 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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@@ -293,6 +361,7 @@ 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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@@ -323,6 +392,8 @@ int chp_new(struct chp_id chpid)
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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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@@ -435,3 +506,180 @@ int chp_process_crw(int id, int status)
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return 0;
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}
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}
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+
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+static inline int info_bit_num(struct chp_id id)
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+{
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+ return id.id + id.cssid * (__MAX_CHPID + 1);
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+}
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+
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+/* Force chp_info refresh on next call to info_validate(). */
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+static void info_expire(void)
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+{
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+ mutex_lock(&info_lock);
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+ chp_info_expires = jiffies - 1;
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+ mutex_unlock(&info_lock);
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+}
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+
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+/* Ensure that chp_info is up-to-date. */
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+static int info_update(void)
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+{
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+ int rc;
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+
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+ mutex_lock(&info_lock);
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+ rc = 0;
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+ if (time_after(jiffies, chp_info_expires)) {
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+ /* Data is too old, update. */
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+ rc = sclp_chp_read_info(&chp_info);
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+ chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ;
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+ }
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+ mutex_unlock(&info_lock);
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+
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+ return rc;
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+}
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+
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+/**
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+ * chp_info_get_status - retrieve configure status of a channel-path
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+ * @chpid: channel-path ID
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+ *
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+ * On success, return 0 for standby, 1 for configured, 2 for reserved,
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+ * 3 for not recognized. Return negative error code on error.
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+ */
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+int chp_info_get_status(struct chp_id chpid)
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+{
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+ int rc;
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+ int bit;
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+
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+ rc = info_update();
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+ if (rc)
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+ return rc;
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+
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+ bit = info_bit_num(chpid);
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+ mutex_lock(&info_lock);
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+ if (!chp_test_bit(chp_info.recognized, bit))
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+ rc = CHP_STATUS_NOT_RECOGNIZED;
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+ else if (chp_test_bit(chp_info.configured, bit))
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+ rc = CHP_STATUS_CONFIGURED;
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+ else if (chp_test_bit(chp_info.standby, bit))
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+ rc = CHP_STATUS_STANDBY;
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+ else
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+ rc = CHP_STATUS_RESERVED;
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+ mutex_unlock(&info_lock);
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+
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+ return rc;
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+}
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+
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+/* Return configure task for chpid. */
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+static enum cfg_task_t cfg_get_task(struct chp_id chpid)
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+{
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+ return chp_cfg_task[chpid.cssid][chpid.id];
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+}
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+
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+/* Set configure task for chpid. */
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+static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg)
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+{
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+ chp_cfg_task[chpid.cssid][chpid.id] = cfg;
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+}
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+
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+/* Perform one configure/deconfigure request. Reschedule work function until
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+ * last request. */
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+static void cfg_func(struct work_struct *work)
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+{
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+ struct chp_id chpid;
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+ enum cfg_task_t t;
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+
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+ mutex_lock(&cfg_lock);
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+ t = cfg_none;
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+ chp_id_for_each(&chpid) {
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+ t = cfg_get_task(chpid);
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+ if (t != cfg_none) {
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+ cfg_set_task(chpid, cfg_none);
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+ break;
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+ }
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+ }
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+ mutex_unlock(&cfg_lock);
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+
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+ switch (t) {
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+ case cfg_configure:
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+ sclp_chp_configure(chpid);
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+ info_expire();
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+ chsc_chp_online(chpid);
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+ break;
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+ case cfg_deconfigure:
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+ sclp_chp_deconfigure(chpid);
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+ info_expire();
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+ chsc_chp_offline(chpid);
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+ break;
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+ case cfg_none:
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+ /* Get updated information after last change. */
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+ info_update();
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+ mutex_lock(&cfg_lock);
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+ cfg_busy = 0;
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+ mutex_unlock(&cfg_lock);
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+ wake_up_interruptible(&cfg_wait_queue);
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+ return;
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+ }
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+ queue_work(chp_wq, &cfg_work);
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+}
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+
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+/**
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+ * chp_cfg_schedule - schedule chpid configuration request
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+ * @chpid - channel-path ID
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+ * @configure - Non-zero for configure, zero for deconfigure
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+ *
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+ * Schedule a channel-path configuration/deconfiguration request.
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+ */
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+void chp_cfg_schedule(struct chp_id chpid, int configure)
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+{
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+ CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id,
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+ configure);
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+ mutex_lock(&cfg_lock);
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+ cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure);
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+ cfg_busy = 1;
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+ mutex_unlock(&cfg_lock);
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+ queue_work(chp_wq, &cfg_work);
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+}
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+
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+/**
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+ * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request
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+ * @chpid - channel-path ID
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+ *
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+ * Cancel an active channel-path deconfiguration request if it has not yet
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+ * been performed.
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+ */
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+void chp_cfg_cancel_deconfigure(struct chp_id chpid)
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+{
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+ CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id);
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+ mutex_lock(&cfg_lock);
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+ if (cfg_get_task(chpid) == cfg_deconfigure)
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+ cfg_set_task(chpid, cfg_none);
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+ mutex_unlock(&cfg_lock);
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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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+ if (wait_event_interruptible(cfg_wait_queue, !cfg_busy))
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+ return -ERESTARTSYS;
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+ return 0;
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+}
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+
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+static int __init chp_init(void)
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+{
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+ struct chp_id chpid;
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+
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+ chp_wq = create_singlethread_workqueue("cio_chp");
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+ if (!chp_wq)
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+ return -ENOMEM;
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+ INIT_WORK(&cfg_work, cfg_func);
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+ init_waitqueue_head(&cfg_wait_queue);
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+ if (info_update())
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+ return 0;
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+ /* Register available channel-paths. */
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+ chp_id_for_each(&chpid) {
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+ if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED)
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+ chp_new(chpid);
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+ }
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+
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+ return 0;
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+}
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+
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+subsys_initcall(chp_init);
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