[PATCH] s390: introduce struct channel_subsystem
struct channel_subsystem encapsulates several per channel subsystem
properties, like status of chpids or the global path group id.
Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index dba632a..b6225cbb 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -24,12 +24,9 @@
int need_rescan = 0;
int css_init_done = 0;
-struct pgid global_pgid;
-int css_characteristics_avail = 0;
+struct channel_subsystem *css[__MAX_CSSID + 1];
-struct device css_bus_device = {
- .bus_id = "css0",
-};
+int css_characteristics_avail = 0;
inline int
for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
@@ -112,7 +109,7 @@
int ret;
/* Initialize the subchannel structure */
- sch->dev.parent = &css_bus_device;
+ sch->dev.parent = &css[0]->device;
sch->dev.bus = &css_bus_type;
sch->dev.release = &css_subchannel_release;
@@ -421,21 +418,35 @@
}
static void __init
-css_generate_pgid(void)
+css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
{
- /* Let's build our path group ID here. */
- if (css_characteristics_avail && css_general_characteristics.mcss)
- global_pgid.cpu_addr = 0x8000;
- else {
+ if (css_characteristics_avail && css_general_characteristics.mcss) {
+ css->global_pgid.pgid_high.ext_cssid.version = 0x80;
+ css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
+ } else {
#ifdef CONFIG_SMP
- global_pgid.cpu_addr = hard_smp_processor_id();
+ css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id();
#else
- global_pgid.cpu_addr = 0;
+ css->global_pgid.pgid_high.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);
+ css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
+ css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
+ css->global_pgid.tod_high = tod_high;
+
+}
+
+static inline void __init
+setup_css(int nr)
+{
+ u32 tod_high;
+
+ memset(css[nr], 0, sizeof(struct channel_subsystem));
+ css[nr]->valid = 1;
+ css[nr]->cssid = nr;
+ sprintf(css[nr]->device.bus_id, "css%x", nr);
+ tod_high = (u32) (get_clock() >> 32);
+ css_generate_pgid(css[nr], tod_high);
}
/*
@@ -446,25 +457,39 @@
static int __init
init_channel_subsystem (void)
{
- int ret;
+ int ret, i;
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)))
- goto out_bus;
+ /* Setup css structure. */
+ for (i = 0; i <= __MAX_CSSID; i++) {
+ css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL);
+ if (!css[i]) {
+ ret = -ENOMEM;
+ goto out_bus;
+ }
+ setup_css(i);
+ ret = device_register(&css[i]->device);
+ if (ret)
+ goto out_free;
+ }
css_init_done = 1;
ctl_set_bit(6, 28);
for_each_subchannel(__init_channel_subsystem, NULL);
return 0;
+out_free:
+ kfree(css[i]);
out_bus:
+ while (i > 0) {
+ i--;
+ device_unregister(&css[i]->device);
+ }
bus_unregister(&css_bus_type);
out:
return ret;