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| author | Alexander Gordeev <agordeev@linux.ibm.com> | 2024-03-01 07:03:49 +0100 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2024-04-17 13:37:59 +0200 |
| commit | b2b15f079c4c19e3a73a8b0cf4f901186f12098f (patch) | |
| tree | d00cb0bad807dd98414097e445ffddb654ef7acf /arch/s390/include | |
| parent | 47bf81767277b5abb87f7e86e15310f0e9d4d06c (diff) | |
| download | linux-b2b15f079c4c19e3a73a8b0cf4f901186f12098f.tar.gz linux-b2b15f079c4c19e3a73a8b0cf4f901186f12098f.tar.bz2 linux-b2b15f079c4c19e3a73a8b0cf4f901186f12098f.zip | |
s390/boot: Consider DCSS segments on memory layout setup
The maximum mappable physical address (as returned by
arch_get_mappable_range() callback) is limited by the
value of (1UL << MAX_PHYSMEM_BITS).
The maximum physical address available to a DCSS segment
is 512GB.
In case the available online or offline memory size is less
than the DCSS limit arch_get_mappable_range() would include
never used [512GB..(1UL << MAX_PHYSMEM_BITS)] range.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/extmem.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/include/asm/extmem.h b/arch/s390/include/asm/extmem.h index 568fd81bb77b..e0a06060afdd 100644 --- a/arch/s390/include/asm/extmem.h +++ b/arch/s390/include/asm/extmem.h @@ -8,6 +8,13 @@ #define _ASM_S390X_DCSS_H #ifndef __ASSEMBLY__ +/* + * DCSS segment is defined as a contiguous range of pages using DEFSEG command. + * The range start and end is a page number with a value less than or equal to + * 0x7ffffff (see CP Commands and Utilities Reference). + */ +#define MAX_DCSS_ADDR (512UL * SZ_1G) + /* possible values for segment type as returned by segment_info */ #define SEG_TYPE_SW 0 #define SEG_TYPE_EW 1 |