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s390/sclp: introduce sclp_early_get_hsa_size

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Introduce sclp_early_get_hsa_size function to be used during early
memory detection. This function allows to find a memory limit imposed
during zfcpdump.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik
2018-04-13 17:37:28 +02:00
committed by Martin Schwidefsky
parent f01b8bca08
commit b09decfd99
2 changed files with 12 additions and 0 deletions
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11
drivers/s390/char/sclp_early_core.c
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@ -288,6 +288,17 @@ int __init sclp_early_get_memsize(unsigned long *mem)
return 0;
}
int __init sclp_early_get_hsa_size(unsigned long *hsa_size)
{
if (!sclp_info_sccb_valid)
return -EIO;
*hsa_size = 0;
if (sclp_info_sccb.hsa_size)
*hsa_size = (sclp_info_sccb.hsa_size - 1) * PAGE_SIZE;
return 0;
}
#define SCLP_STORAGE_INFO_FACILITY 0x0000400000000000UL
void __weak __init add_mem_detect_block(u64 start, u64 end) {}