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[PATCH] s390: introduce struct channel_subsystem

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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>
This commit is contained in:
Cornelia Huck
2006-01-06 00:19:23 -08:00
committed by Linus Torvalds
parent f97a56fb76
commit a28c694481
6 changed files with 90 additions and 45 deletions
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67
drivers/s390/cio/css.c
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@@ -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 @@ css_register_subchannel(struct subchannel *sch)
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 @@ __init_channel_subsystem(struct subchannel_id schid, void *data)
}
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 @@ css_generate_pgid(void)
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;