s390: add HWCAP_S390_PCI_MIO to ELF hwcaps

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In order to support the use of enhanced PCI instructions in both kernel-
and userspace we need both hardware support and proper setup in the
kernel. The latter can be toggled off with the pci=nomio command line
option.

Thus availability of this feature in userspace depends on all of kernel
configuration (CONFIG_PCI), hardware support and the current kernel
command line and can thus not rely solely on a facility bit. Instead
let's introduce a new ELF hardware capability bit HWCAP_S390_PCI_MIO to
tell userspace whether these PCI instructions can be used.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Niklas Schnelle 2021-07-08 15:43:13 +02:00 • committed by Heiko Carstens

parent 3322ba0d7b

commit 7e8403ecaf

3 changed files with 4 additions and 1 deletions

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1

arch/s390/include/asm/elf.h

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2

arch/s390/kernel/processor.c

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2

arch/s390/kernel/setup.c

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