Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-pull

[linux-2.6] / drivers / s390 / cio / css.c

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 020566571e07606b203a8f6d5d7d7de8b9afcae8..46c021d880dc5ee7441cd11f8e885bf54d79b7dd 100644 (file)
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -13,7 +13,9 @@
 #include <linux/errno.h>
 #include <linux/list.h>
 #include <linux/reboot.h>
+#include <asm/isc.h>
 
+#include "../s390mach.h"
 #include "css.h"
 #include "cio.h"
 #include "cio_debug.h"
@@ -29,8 +31,6 @@ static int max_ssid = 0;
 
 struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1];
 
-int css_characteristics_avail = 0;
-
 int
 for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
 {
@@ -157,12 +157,18 @@ static int css_sch_device_register(struct subchannel *sch)
        return ret;
 }
 
+/**
+ * css_sch_device_unregister - unregister a subchannel
+ * @sch: subchannel to be unregistered
+ */
 void css_sch_device_unregister(struct subchannel *sch)
 {
        mutex_lock(&sch->reg_mutex);
-       device_unregister(&sch->dev);
+       if (device_is_registered(&sch->dev))
+               device_unregister(&sch->dev);
        mutex_unlock(&sch->reg_mutex);
 }
+EXPORT_SYMBOL_GPL(css_sch_device_unregister);
 
 static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
 {
@@ -326,6 +332,8 @@ int css_sch_is_valid(struct schib *schib)
 {
        if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv)
                return 0;
+       if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w)
+               return 0;
        return 1;
 }
 EXPORT_SYMBOL_GPL(css_sch_is_valid);
@@ -530,18 +538,29 @@ EXPORT_SYMBOL_GPL(css_schedule_reprobe);
 /*
  * Called from the machine check handler for subchannel report words.
  */
-void css_process_crw(int rsid1, int rsid2)
+static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 {
        struct subchannel_id mchk_schid;
 
-       CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n",
-                     rsid1, rsid2);
+       if (overflow) {
+               css_schedule_eval_all();
+               return;
+       }
+       CIO_CRW_EVENT(2, "CRW0 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);
+       if (crw1)
+               CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, "
+                             "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
+                             crw1->slct, crw1->oflw, crw1->chn, crw1->rsc,
+                             crw1->anc, crw1->erc, crw1->rsid);
        init_subchannel_id(&mchk_schid);
-       mchk_schid.sch_no = rsid1;
-       if (rsid2 != 0)
-               mchk_schid.ssid = (rsid2 >> 8) & 3;
+       mchk_schid.sch_no = crw0->rsid;
+       if (crw1)
+               mchk_schid.ssid = (crw1->rsid >> 8) & 3;
 
-       /* 
+       /*
         * Since we are always presented with IPI in the CRW, we have to
         * use stsch() to find out if the subchannel in question has come
         * or gone.
@@ -592,7 +611,7 @@ __init_channel_subsystem(struct subchannel_id schid, void *data)
 static void __init
 css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
 {
-       if (css_characteristics_avail && css_general_characteristics.mcss) {
+       if (css_general_characteristics.mcss) {
                css->global_pgid.pgid_high.ext_cssid.version = 0x80;
                css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
        } else {
@@ -729,8 +748,6 @@ init_channel_subsystem (void)
        ret = chsc_determine_css_characteristics();
        if (ret == -ENOMEM)
                goto out; /* No need to continue. */
-       if (ret == 0)
-               css_characteristics_avail = 1;
 
        ret = chsc_alloc_sei_area();
        if (ret)
@@ -740,6 +757,10 @@ init_channel_subsystem (void)
        if (ret)
                goto out;
 
+       ret = s390_register_crw_handler(CRW_RSC_SCH, css_process_crw);
+       if (ret)
+               goto out;
+
        if ((ret = bus_register(&css_bus_type)))
                goto out;
 
@@ -770,8 +791,7 @@ init_channel_subsystem (void)
                ret = device_register(&css->device);
                if (ret)
                        goto out_free_all;
-               if (css_characteristics_avail &&
-                   css_chsc_characteristics.secm) {
+               if (css_chsc_characteristics.secm) {
                        ret = device_create_file(&css->device,
                                                 &dev_attr_cm_enable);
                        if (ret)
@@ -786,7 +806,8 @@ init_channel_subsystem (void)
                goto out_pseudo;
        css_init_done = 1;
 
-       ctl_set_bit(6, 28);
+       /* Enable default isc for I/O subchannels. */
+       isc_register(IO_SCH_ISC);
 
        for_each_subchannel(__init_channel_subsystem, NULL);
        return 0;
@@ -809,7 +830,7 @@ out_unregister:
                i--;
                css = channel_subsystems[i];
                device_unregister(&css->pseudo_subchannel->dev);
-               if (css_characteristics_avail && css_chsc_characteristics.secm)
+               if (css_chsc_characteristics.secm)
                        device_remove_file(&css->device,
                                           &dev_attr_cm_enable);
                device_unregister(&css->device);
@@ -817,6 +838,7 @@ out_unregister:
 out_bus:
        bus_unregister(&css_bus_type);
 out:
+       s390_unregister_crw_handler(CRW_RSC_CSS);
        chsc_free_sei_area();
        kfree(slow_subchannel_set);
        printk(KERN_WARNING"cio: failed to initialize css driver (%d)!\n",
@@ -829,19 +851,16 @@ int sch_is_pseudo_sch(struct subchannel *sch)
        return sch == to_css(sch->dev.parent)->pseudo_subchannel;
 }
 
-/*
- * find a driver for a subchannel. They identify by the subchannel
- * type with the exception that the console subchannel driver has its own
- * subchannel type although the device is an i/o subchannel
- */
-static int
-css_bus_match (struct device *dev, struct device_driver *drv)
+static int css_bus_match(struct device *dev, struct device_driver *drv)
 {
        struct subchannel *sch = to_subchannel(dev);
        struct css_driver *driver = to_cssdriver(drv);
+       struct css_device_id *id;
 
-       if (sch->st == driver->subchannel_type)
-               return 1;
+       for (id = driver->subchannel_type; id->match_flags; id++) {
+               if (sch->st == id->type)
+                       return 1;
+       }
 
        return 0;
 }
@@ -932,4 +951,3 @@ subsys_initcall(init_channel_subsystem);
 
 MODULE_LICENSE("GPL");
 EXPORT_SYMBOL(css_bus_type);
-EXPORT_SYMBOL_GPL(css_characteristics_avail);