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* s390/mem_detect: provide single get_mem_detect_endVasily Gorbik2019-08-261-7/+0
| | | | | | | | get_mem_detect_end is already used in couple of places with potential to be utilized in more cases. Provide single get_mem_detect_end implementation in asm/mem_detect.h to be used by kasan and startup code. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/mem_detect: Use IS_ENABLED(CONFIG_BLK_DEV_INITRD)Joe Perches2019-03-291-1/+1
| | | | | | | | | IS_ENABLED should generally use CONFIG_ prefaced symbols and it doesn't appear as if there is a BLK_DEV_INITRD define. Cc: <stable@vger.kernel.org> # 4.20 Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mem_detect: add missing includeHeiko Carstens2018-10-101-0/+1
| | | | | | | | | | Fix this allnoconfig build breakage: arch/s390/boot/mem_detect.c: In function 'tprot': arch/s390/boot/mem_detect.c:122:12: error: 'EFAULT' undeclared (first use in this function) Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mem_detect: replace tprot loop with binary searchVasily Gorbik2018-10-091-32/+17
| | | | | | | | | | | | In a situation when other memory detection methods are not available (no SCLP and no z/VM diag260), continuous online memory is assumed. Replacing tprot loop with faster binary search, as only online memory end has to be found. 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>
* s390/mem_detect: use SCLP info for continuous memory detectionVasily Gorbik2018-10-091-2/+7
| | | | | | | | | | | When neither SCLP storage info, nor z/VM diag260 "storage configuration" are available assume a continuous online memory of size specified by SCLP info. 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>
* s390/mem_detect: introduce z/VM specific diag260 callVasily Gorbik2018-10-091-0/+52
| | | | | | | | | | | In the case when z/VM memory is defined with "define storage config" command, SCLP storage info is not available. Utilize diag260 "storage configuration" call, to get information about z/VM specific guest memory definitions with potential memory holes. 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>
* s390/mem_detect: introduce SCLP storage infoVasily Gorbik2018-10-091-0/+6
| | | | | | | | | | SCLP storage info allows to detect continuous and non-continuous online memory under LPAR, z/VM and KVM, when standby memory is defined. 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>
* s390/mem_detect: move tprot loop to early boot phaseVasily Gorbik2018-10-091-0/+133
Move memory detection to early boot phase. To store online memory regions "struct mem_detect_info" has been introduced together with for_each_mem_detect_block iterator. mem_detect_info is later converted to memblock. Also introduces sclp_early_get_meminfo function to get maximum physical memory and maximum increment number. 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>
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