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| author | Sumanth Korikkar <sumanthk@linux.ibm.com> | 2020-11-11 10:03:02 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2020-11-18 14:16:02 +0300 |
| commit | b971cbd03ee0a24f7af47b681e8f911794c69780 (patch) | |
| tree | e5eaec17dc4235384324ad7302f1031da587f66f /arch/s390/include/asm/setup.h | |
| parent | d25d23e134a43457759fa602a15c1e9fce741727 (diff) | |
| download | linux-b971cbd03ee0a24f7af47b681e8f911794c69780.tar.xz | |
s390/sclp: provide extended sccb support
As the number of cpus increases, the sccb response can exceed 4k for
read cpu and read scp info sclp commands. Hence, all cpu info entries
cant be embedded within a sccb response
Solution:
To overcome this limitation, extended sccb facility is provided by sclp.
1. Check if the extended sccb facility is installed.
2. If extended sccb is installed, perform the read scp and read cpu
command considering a max sccb length of three page size. This max
length is based on factors like max cpus, sccb header.
3. If extended sccb is not installed, perform the read scp and read cpu
sclp command considering a max sccb length of one page size.
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/setup.h')
| -rw-r--r-- | arch/s390/include/asm/setup.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h index bdb242a1544e..1be6a064f317 100644 --- a/arch/s390/include/asm/setup.h +++ b/arch/s390/include/asm/setup.h @@ -16,8 +16,6 @@ #define EARLY_SCCB_OFFSET 0x11000 #define HEAD_END 0x12000 -#define EARLY_SCCB_SIZE PAGE_SIZE - /* * Machine features detected in early.c */ |