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authorNiklas Schnelle <schnelle@linux.ibm.com>2021-07-08 15:55:42 +0300
committerHeiko Carstens <hca@linux.ibm.com>2021-07-27 10:39:19 +0300
commit3322ba0d7bea1e24ae464418626f6a15b69533ab (patch)
tree36818fc097003229c99cb556d613dc949bdb29d0 /arch/s390/pci/pci.c
parent196e3c6ad1ccea7552b796461d1666bfd9a76b2b (diff)
downloadlinux-3322ba0d7bea1e24ae464418626f6a15b69533ab.tar.xz
s390: make PCI mio support a machine flag
Kernel support for the newer PCI mio instructions can be toggled off with the pci=nomio command line option which needs to integrate with common code PCI option parsing. However this option then toggles static branches which can't be toggled yet in an early_param() call. Thus commit 9964f396f1d0 ("s390: fix setting of mio addressing control") moved toggling the static branches to the PCI init routine. With this setup however we can't check for mio support outside the PCI code during early boot, i.e. before switching the static branches, which we need to be able to export this as an ELF HWCAP. Improve on this by turning mio availability into a machine flag that gets initially set based on CONFIG_PCI and the facility bit and gets toggled off if pci=nomio is found during PCI option parsing allowing simple access to this machine flag after early init. 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>
Diffstat (limited to 'arch/s390/pci/pci.c')
-rw-r--r--arch/s390/pci/pci.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index b0993e05affe..a678b9db56e5 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -886,7 +886,6 @@ static void zpci_mem_exit(void)
}
static unsigned int s390_pci_probe __initdata = 1;
-static unsigned int s390_pci_no_mio __initdata;
unsigned int s390_pci_force_floating __initdata;
static unsigned int s390_pci_initialized;
@@ -897,7 +896,7 @@ char * __init pcibios_setup(char *str)
return NULL;
}
if (!strcmp(str, "nomio")) {
- s390_pci_no_mio = 1;
+ S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
return NULL;
}
if (!strcmp(str, "force_floating")) {
@@ -928,7 +927,7 @@ static int __init pci_base_init(void)
return 0;
}
- if (test_facility(153) && !s390_pci_no_mio) {
+ if (MACHINE_HAS_PCI_MIO) {
static_branch_enable(&have_mio);
ctl_set_bit(2, 5);
}