vserver 1.9.5.x5

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

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index f996528..948b3b1 100644 (file)
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1,7 +1,7 @@
 /*
  *  drivers/s390/cio/css.c
  *  driver for channel subsystem
- *   $Revision: 1.77 $
+ *   $Revision: 1.84 $
  *
  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
  *                      IBM Corporation
@@ -19,11 +19,15 @@
 #include "cio.h"
 #include "cio_debug.h"
 #include "ioasm.h"
+#include "chsc.h"
 
 unsigned int highest_subchannel;
 int need_rescan = 0;
 int css_init_done = 0;
 
+struct pgid global_pgid;
+int css_characteristics_avail = 0;
+
 struct device css_bus_device = {
        .bus_id = "css0",
 };
@@ -184,6 +188,12 @@ css_evaluate_subchannel(int irq, int slow)
                        put_device(&sch->dev);
                return 0; /* Already processed. */
        }
+       /*
+        * We've got a machine check, so running I/O won't get an interrupt.
+        * Kill any pending timers.
+        */
+       if (sch)
+               device_kill_pending_timer(sch);
        if (!disc && !slow) {
                if (sch)
                        put_device(&sch->dev);
@@ -201,6 +211,20 @@ css_evaluate_subchannel(int irq, int slow)
                        ret = 0;
                        break;
                }
+               if (disc && (event == CIO_NO_PATH)) {
+                       /*
+                        * Uargh, hack again. Because we don't get a machine
+                        * check on configure on, our path bookkeeping can
+                        * be out of date here (it's fine while we only do
+                        * logical varying or get chsc machine checks). We
+                        * need to force reprobing or we might miss devices
+                        * coming operational again. It won't do harm in real
+                        * no path situations.
+                        */
+                       device_trigger_reprobe(sch);
+                       ret = 0;
+                       break;
+               }
                if (sch->driver && sch->driver->notify &&
                    sch->driver->notify(&sch->dev, event)) {
                        cio_disable_subchannel(sch);
@@ -260,7 +284,7 @@ css_rescan_devices(void)
 {
        int irq, ret;
 
-       for (irq = 0; irq <= __MAX_SUBCHANNELS; irq++) {
+       for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
                ret = css_evaluate_subchannel(irq, 1);
                /* No more memory. It doesn't make sense to continue. No
                 * panic because this can happen in midflight and just
@@ -280,7 +304,7 @@ struct slow_subchannel {
 };
 
 static LIST_HEAD(slow_subchannels_head);
-static spinlock_t slow_subchannel_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(slow_subchannel_lock);
 
 static void
 css_trigger_slow_path(void)
@@ -352,9 +376,26 @@ css_process_crw(int irq)
        return ret;
 }
 
+static void __init
+css_generate_pgid(void)
+{
+       /* Let's build our path group ID here. */
+       if (css_characteristics_avail && css_general_characteristics.mcss)
+               global_pgid.cpu_addr = 0x8000;
+       else {
+#ifdef CONFIG_SMP
+               global_pgid.cpu_addr = hard_smp_processor_id();
+#else
+               global_pgid.cpu_addr = 0;
+#endif
+       }
+       global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
+       global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
+       global_pgid.tod_high = (__u32) (get_clock() >> 32);
+}
+
 /*
- * some of the initialization has already been done from init_IRQ(),
- * here we do the rest now that the driver core is running.
+ * Now that the driver core is running, we can setup our channel subsystem.
  * The struct subchannel's are created during probing (except for the
  * static console subchannel).
  */
@@ -363,6 +404,11 @@ init_channel_subsystem (void)
 {
        int ret, irq;
 
+       if (chsc_determine_css_characteristics() == 0)
+               css_characteristics_avail = 1;
+
+       css_generate_pgid();
+
        if ((ret = bus_register(&css_bus_type)))
                goto out;
        if ((ret = device_register (&css_bus_device)))
@@ -481,6 +527,7 @@ css_enqueue_subchannel_slow(unsigned long schid)
        new_slow_sch = kmalloc(sizeof(struct slow_subchannel), GFP_ATOMIC);
        if (!new_slow_sch)
                return -ENOMEM;
+       memset(new_slow_sch, 0, sizeof(struct slow_subchannel));
        new_slow_sch->schid = schid;
        spin_lock_irqsave(&slow_subchannel_lock, flags);
        list_add_tail(&new_slow_sch->slow_list, &slow_subchannels_head);
@@ -517,3 +564,4 @@ MODULE_LICENSE("GPL");
 EXPORT_SYMBOL(css_bus_type);
 EXPORT_SYMBOL(s390_root_dev_register);
 EXPORT_SYMBOL(s390_root_dev_unregister);
+EXPORT_SYMBOL_GPL(css_characteristics_avail);