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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-05-24 12:30:03 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-06-26 21:10:03 +0200 |
| commit | 25b41a7b67ee4f4d12cee8a4b8b5929e36c27e29 (patch) | |
| tree | 519be1cacdb7a23ff314ade0cec813c6d59b1af9 /drivers/s390/char/sclp.h | |
| parent | s390: remove virt_to_phys implementation (diff) | |
| download | linux-25b41a7b67ee4f4d12cee8a4b8b5929e36c27e29.tar.xz linux-25b41a7b67ee4f4d12cee8a4b8b5929e36c27e29.zip | |
s390/sclp: add parameter to specify number of buffer pages
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>
Diffstat (limited to 'drivers/s390/char/sclp.h')
| -rw-r--r-- | drivers/s390/char/sclp.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h index 25bcd4c0ed82..e11383f5d3d2 100644 --- a/drivers/s390/char/sclp.h +++ b/drivers/s390/char/sclp.h @@ -15,7 +15,7 @@ /* maximum number of pages concerning our own memory management */ #define MAX_KMEM_PAGES (sizeof(unsigned long) << 3) -#define MAX_CONSOLE_PAGES 6 +#define SCLP_CONSOLE_PAGES 6 #define EVTYP_OPCMD 0x01 #define EVTYP_MSG 0x02 @@ -175,6 +175,10 @@ int sclp_service_call(sclp_cmdw_t command, void *sccb); int sclp_sdias_init(void); void sclp_sdias_exit(void); +extern int sclp_console_pages; +extern int sclp_console_drop; +extern unsigned long sclp_console_full; + /* useful inlines */ /* VM uses EBCDIC 037, LPAR+native(SE+HMC) use EBCDIC 500 */ |