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[IA64] MCA/INIT: avoid reading INIT record during INIT event

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Reading the INIT record from SAL during the INIT event has proved to be
unreliable, and a source of hangs during INIT processing.  The new
MCA/INIT handlers remove the need to get the INIT record from SAL.
Change salinfo.c so mca.c can just flag that a new record is available,
without having to read the record during INIT processing.  This patch
can be applied without the new MCA/INIT handlers.

Also clean up some usage of NR_CPUS which should have been using
cpu_online().

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Keith Owens 2005-09-11 17:21:46 +10:00 committed by Tony Luck
parent e619ae0b96
commit 289d773ee8
1 changed files with 34 additions and 28 deletions
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62
arch/ia64/kernel/salinfo.c
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@ -22,6 +22,11 @@
*
* Dec 5 2004 kaos@sgi.com
* Standardize which records are cleared automatically.
*
* Aug 18 2005 kaos@sgi.com
* mca.c may not pass a buffer, a NULL buffer just indicates that a new
* record is available in SAL.
* Replace some NR_CPUS by cpus_online, for hotplug cpu.
*/
#include <linux/types.h>
@ -193,7 +198,7 @@ shift1_data_saved (struct salinfo_data *data, int shift)
* The buffer passed from mca.c points to the output from ia64_log_get. This is
* a persistent buffer but its contents can change between the interrupt and
* when user space processes the record. Save the record id to identify
* changes.
* changes. If the buffer is NULL then just update the bitmap.
*/
void
salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
@ -206,27 +211,29 @@ salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
if (irqsafe)
spin_lock_irqsave(&data_saved_lock, flags);
for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
if (!data_saved->buffer)
break;
if (buffer) {
if (irqsafe)
spin_lock_irqsave(&data_saved_lock, flags);
for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
if (!data_saved->buffer)
break;
}
if (i == saved_size) {
if (!data->saved_num) {
shift1_data_saved(data, 0);
data_saved = data->data_saved + saved_size - 1;
} else
data_saved = NULL;
}
if (data_saved) {
data_saved->cpu = smp_processor_id();
data_saved->id = ((sal_log_record_header_t *)buffer)->id;
data_saved->size = size;
data_saved->buffer = buffer;
}
if (irqsafe)
spin_unlock_irqrestore(&data_saved_lock, flags);
}
if (i == saved_size) {
if (!data->saved_num) {
shift1_data_saved(data, 0);
data_saved = data->data_saved + saved_size - 1;
} else
data_saved = NULL;
}
if (data_saved) {
data_saved->cpu = smp_processor_id();
data_saved->id = ((sal_log_record_header_t *)buffer)->id;
data_saved->size = size;
data_saved->buffer = buffer;
}
if (irqsafe)
spin_unlock_irqrestore(&data_saved_lock, flags);
if (!test_and_set_bit(smp_processor_id(), &data->cpu_event)) {
if (irqsafe)
@ -244,7 +251,7 @@ salinfo_timeout_check(struct salinfo_data *data)
int i;
if (!data->open)
return;
for (i = 0; i < NR_CPUS; ++i) {
for_each_online_cpu(i) {
if (test_bit(i, &data->cpu_event)) {
/* double up() is not a problem, user space will see no
* records for the additional "events".
@ -291,7 +298,7 @@ salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t
n = data->cpu_check;
for (i = 0; i < NR_CPUS; i++) {
if (test_bit(n, &data->cpu_event)) {
if (test_bit(n, &data->cpu_event) && cpu_online(n)) {
cpu = n;
break;
}
@ -585,11 +592,10 @@ salinfo_init(void)
/* we missed any events before now */
online = 0;
for (j = 0; j < NR_CPUS; j++)
if (cpu_online(j)) {
set_bit(j, &data->cpu_event);
++online;
}
for_each_online_cpu(j) {
set_bit(j, &data->cpu_event);
++online;
}
sema_init(&data->sem, online);
*sdir++ = dir;