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s390/sclp: add parameter to specify number of buffer pages

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Add a kernel parameter to be able to specify the number of pages to be
used as output buffer by the line-mode sclp driver and the vt220 sclp
driver. The current number of output pages is 6, if the service element
is unavailable the boot messages alone can fill up the output buffer.
If this happens the system blocks until the service element is working
again. For a large LPAR with many devices it is sensible to have the
ability to increase the output buffer size. To help to debug this
situation add a counter for the page-pool-empty situation and make it
available as a sclp driver attribute.
To avoid the system to stall until the service element works again
add another kernel parameter to allow to drop output buffers.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2013-05-24 12:30:03 +02:00
parent 92820a5f99
commit 25b41a7b67
4 changed files with 138 additions and 7 deletions
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31
drivers/s390/char/sclp_con.c
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@@ -129,6 +129,31 @@ sclp_console_timeout(unsigned long data)
sclp_conbuf_emit();
}
/*
* Drop oldest console buffer if sclp_con_drop is set
*/
static int
sclp_console_drop_buffer(void)
{
struct list_head *list;
struct sclp_buffer *buffer;
void *page;
if (!sclp_console_drop)
return 0;
list = sclp_con_outqueue.next;
if (sclp_con_queue_running)
/* The first element is in I/O */
list = list->next;
if (list == &sclp_con_outqueue)
return 0;
list_del(list);
buffer = list_entry(list, struct sclp_buffer, list);
page = sclp_unmake_buffer(buffer);
list_add_tail((struct list_head *) page, &sclp_con_pages);
return 1;
}
/*
* Writes the given message to S390 system console
*/
@@ -150,9 +175,13 @@ sclp_console_write(struct console *console, const char *message,
do {
/* make sure we have a console output buffer */
if (sclp_conbuf == NULL) {
if (list_empty(&sclp_con_pages))
sclp_console_full++;
while (list_empty(&sclp_con_pages)) {
if (sclp_con_suspended)
goto out;
if (sclp_console_drop_buffer())
break;
spin_unlock_irqrestore(&sclp_con_lock, flags);
sclp_sync_wait();
spin_lock_irqsave(&sclp_con_lock, flags);
@@ -297,7 +326,7 @@ sclp_console_init(void)
return rc;
/* Allocate pages for output buffering */
INIT_LIST_HEAD(&sclp_con_pages);
for (i = 0; i < MAX_CONSOLE_PAGES; i++) {
for (i = 0; i < sclp_console_pages; i++) {
page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
list_add_tail(page, &sclp_con_pages);
}