diff options
| author | Sebastian Ott <sebott@linux.ibm.com> | 2019-04-18 21:39:06 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-29 10:47:01 +0200 |
| commit | 56271303808fb86375ec33183d56c21fdeb836ea (patch) | |
| tree | 967c102ad201f82d36177cb694eecbdc28b5c14f /arch/s390/pci/pci.c | |
| parent | 71ba41c9b1d91042960e9d92a5c8f52dc8531eda (diff) | |
s390/pci: add parameter to disable usage of MIO instructions
Allow users to disable usage of MIO instructions by specifying pci=nomio
at the kernel command line.
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci/pci.c')
| -rw-r--r-- | arch/s390/pci/pci.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index dff8f4526c8d..0ebb7c405a25 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -850,6 +850,7 @@ 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; @@ -859,6 +860,10 @@ char * __init pcibios_setup(char *str) s390_pci_probe = 0; return NULL; } + if (!strcmp(str, "nomio")) { + s390_pci_no_mio = 1; + return NULL; + } if (!strcmp(str, "force_floating")) { s390_pci_force_floating = 1; return NULL; @@ -881,7 +886,7 @@ static int __init pci_base_init(void) if (!test_facility(69) || !test_facility(71)) return 0; - if (test_facility(153)) + if (test_facility(153) && !s390_pci_no_mio) static_branch_enable(&have_mio); rc = zpci_debug_init(); |