diff options
Diffstat (limited to 'drivers/s390/cio/chp.c')
| -rw-r--r-- | drivers/s390/cio/chp.c | 315 |
1 files changed, 212 insertions, 103 deletions
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c index ac289e6eadf..d497aa05a72 100644 --- a/drivers/s390/cio/chp.c +++ b/drivers/s390/cio/chp.c @@ -1,7 +1,5 @@ /* - * drivers/s390/cio/chp.c - * - * Copyright IBM Corp. 1999,2007 + * Copyright IBM Corp. 1999, 2010 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) * Arnd Bergmann (arndb@de.ibm.com) * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> @@ -10,13 +8,17 @@ #include <linux/bug.h> #include <linux/workqueue.h> #include <linux/spinlock.h> +#include <linux/export.h> +#include <linux/sched.h> #include <linux/init.h> #include <linux/jiffies.h> #include <linux/wait.h> #include <linux/mutex.h> -#include <asm/errno.h> +#include <linux/errno.h> +#include <linux/slab.h> #include <asm/chpid.h> #include <asm/sclp.h> +#include <asm/crw.h> #include "cio.h" #include "css.h" @@ -52,19 +54,13 @@ 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 +/* On success 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) { @@ -86,7 +82,7 @@ u8 chp_get_sch_opm(struct subchannel *sch) opm = 0; chp_id_init(&chpid); - for (i=0; i < 8; i++) { + for (i = 0; i < 8; i++) { opm <<= 1; chpid.id = sch->schib.pmcw.chpid[i]; if (chp_get_status(chpid) != 0) @@ -94,6 +90,7 @@ u8 chp_get_sch_opm(struct subchannel *sch) } return opm; } +EXPORT_SYMBOL_GPL(chp_get_sch_opm); /** * chp_is_registered - check if a channel-path is registered @@ -118,20 +115,11 @@ static int s390_vary_chpid(struct chp_id chpid, int on) sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, chpid.id); - CIO_TRACE_EVENT( 2, dbf_text); + 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; - } + if (!on && !status) + return 0; set_chp_logically_online(chpid, on); chsc_chp_vary(chpid, on); @@ -141,31 +129,27 @@ static int s390_vary_chpid(struct chp_id chpid, int on) /* * Channel measurement related functions */ -static ssize_t chp_measurement_chars_read(struct kobject *kobj, char *buf, - loff_t off, size_t count) +static ssize_t chp_measurement_chars_read(struct file *filp, + struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) { struct channel_path *chp; - unsigned int size; + struct device *device; - chp = to_channelpath(container_of(kobj, struct device, kobj)); + device = container_of(kobj, struct device, kobj); + chp = to_channelpath(device); 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; + return memory_read_from_buffer(buf, count, &off, + chp->cmg_chars, sizeof(struct cmg_chars)); } 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, @@ -193,14 +177,17 @@ static void chp_measurement_copy_block(struct cmg_entry *buf, } 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) +static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) { struct channel_path *chp; struct channel_subsystem *css; + struct device *device; unsigned int size; - chp = to_channelpath(container_of(kobj, struct device, kobj)); + device = container_of(kobj, struct device, kobj); + chp = to_channelpath(device); css = to_css(chp->dev.parent); size = sizeof(struct cmg_entry); @@ -217,7 +204,6 @@ 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, @@ -248,19 +234,21 @@ int chp_add_cmg_attr(struct channel_path *chp) 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); + struct channel_path *chp = to_channelpath(dev); + int status; - if (!chp) - return 0; - return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : - sprintf(buf, "offline\n")); + mutex_lock(&chp->lock); + status = chp->state; + mutex_unlock(&chp->lock); + + return status ? 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); + struct channel_path *cp = to_channelpath(dev); char cmd[10]; int num_args; int error; @@ -269,15 +257,18 @@ static ssize_t chp_status_write(struct device *dev, if (!num_args) return count; - if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) + if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) { + mutex_lock(&cp->lock); error = s390_vary_chpid(cp->chpid, 1); - else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) + mutex_unlock(&cp->lock); + } else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) { + mutex_lock(&cp->lock); error = s390_vary_chpid(cp->chpid, 0); - else + mutex_unlock(&cp->lock); + } else error = -EINVAL; return error < 0 ? error : count; - } static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); @@ -288,7 +279,7 @@ static ssize_t chp_configure_show(struct device *dev, struct channel_path *cp; int status; - cp = container_of(dev, struct channel_path, dev); + cp = to_channelpath(dev); status = chp_info_get_status(cp->chpid); if (status < 0) return status; @@ -310,7 +301,7 @@ static ssize_t chp_configure_write(struct device *dev, return -EINVAL; if (val != 0 && val != 1) return -EINVAL; - cp = container_of(dev, struct channel_path, dev); + cp = to_channelpath(dev); chp_cfg_schedule(cp->chpid, val); cfg_wait_idle(); @@ -322,11 +313,13 @@ 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); + struct channel_path *chp = to_channelpath(dev); + u8 type; - if (!chp) - return 0; - return sprintf(buf, "%x\n", chp->desc.desc); + mutex_lock(&chp->lock); + type = chp->desc.desc; + mutex_unlock(&chp->lock); + return sprintf(buf, "%x\n", type); } static DEVICE_ATTR(type, 0444, chp_type_show, NULL); @@ -359,28 +352,87 @@ static ssize_t chp_shared_show(struct device *dev, static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); -static struct attribute * chp_attrs[] = { +static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + ssize_t rc; + + mutex_lock(&chp->lock); + if (chp->desc_fmt1.flags & 0x10) + rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); + else + rc = 0; + mutex_unlock(&chp->lock); + + return rc; +} +static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); + +static ssize_t chp_chid_external_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + ssize_t rc; + + mutex_lock(&chp->lock); + if (chp->desc_fmt1.flags & 0x10) + rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); + else + rc = 0; + mutex_unlock(&chp->lock); + + return rc; +} +static DEVICE_ATTR(chid_external, 0444, chp_chid_external_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, + &dev_attr_chid.attr, + &dev_attr_chid_external.attr, NULL, }; - static struct attribute_group chp_attr_group = { .attrs = chp_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 = container_of(dev, struct channel_path, dev); + 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. + * Return zero on success, non-zero otherwise. + */ +int chp_update_desc(struct channel_path *chp) +{ + int rc; + + rc = chsc_determine_base_channel_path_desc(chp->chpid, &chp->desc); + if (rc) + return rc; + + rc = chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); + + return rc; +} + +/** * chp_new - register a new channel-path * @chpid - channel-path ID * @@ -401,13 +453,13 @@ int chp_new(struct chp_id chpid) /* fill in status, etc. */ chp->chpid = chpid; chp->state = 1; - chp->dev.parent = &css[chpid.cssid]->device; + chp->dev.parent = &channel_subsystems[chpid.cssid]->device; + chp->dev.groups = chp_attr_groups; chp->dev.release = chp_release; - snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid, - chpid.id); + mutex_init(&chp->lock); /* Obtain channel path description and fill it in. */ - ret = chsc_determine_channel_path_description(chpid, &chp->desc); + ret = chp_update_desc(chp); if (ret) goto out_free; if ((chp->desc.flags & 0x80) == 0) { @@ -415,49 +467,38 @@ int chp_new(struct chp_id chpid) goto out_free; } /* Get channel-measurement characteristics. */ - if (css_characteristics_avail && css_chsc_characteristics.scmc - && css_chsc_characteristics.secm) { + if (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; } + 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) { - printk(KERN_WARNING "%s: could not register %x.%02x\n", - __func__, chpid.cssid, chpid.id); - goto out_free; + CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", + chpid.cssid, chpid.id, ret); + put_device(&chp->dev); + goto out; } - 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) { + mutex_lock(&channel_subsystems[chpid.cssid]->mutex); + if (channel_subsystems[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; + mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); + goto out; } } - css[chpid.cssid]->chps[chpid.id] = chp; - mutex_unlock(&css[chpid.cssid]->mutex); - return ret; + channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; + mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); + goto out; out_free: kfree(chp); +out: return ret; } @@ -468,7 +509,7 @@ out_free: * 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_desc *chp_get_chp_desc(struct chp_id chpid) { struct channel_path *chp; struct channel_path_desc *desc; @@ -479,31 +520,82 @@ void *chp_get_chp_desc(struct chp_id chpid) desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); if (!desc) return NULL; + + mutex_lock(&chp->lock); memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); + mutex_unlock(&chp->lock); 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 + * @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. */ -void chp_process_crw(int id, int status) +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 = id; - if (status) { + chpid.id = crw0->rsid; + switch (crw0->erc) { + case CRW_ERC_IPARM: /* Path has come. */ if (!chp_is_registered(chpid)) chp_new(chpid); chsc_chp_online(chpid); - } else + 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) { @@ -584,6 +676,7 @@ 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; @@ -598,14 +691,24 @@ static void cfg_func(struct work_struct *work) switch (t) { case cfg_configure: - sclp_chp_configure(chpid); - info_expire(); - chsc_chp_online(chpid); + 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: - sclp_chp_deconfigure(chpid); - info_expire(); - chsc_chp_offline(chpid); + 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. */ @@ -663,10 +766,16 @@ static int cfg_wait_idle(void) 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) + 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()) |