forked from luck/tmp_suning_uos_patched
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>
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@ -3395,6 +3395,7 @@
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this removes isolation between devices and
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may put more devices in an IOMMU group.
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force_floating [S390] Force usage of floating interrupts.
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nomio [S390] Do not use MIO instructions.
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pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
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Management.
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@ -850,6 +850,7 @@ static void zpci_mem_exit(void)
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}
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static unsigned int s390_pci_probe __initdata = 1;
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static unsigned int s390_pci_no_mio __initdata;
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unsigned int s390_pci_force_floating __initdata;
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static unsigned int s390_pci_initialized;
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@ -859,6 +860,10 @@ char * __init pcibios_setup(char *str)
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s390_pci_probe = 0;
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return NULL;
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}
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if (!strcmp(str, "nomio")) {
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s390_pci_no_mio = 1;
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return NULL;
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}
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if (!strcmp(str, "force_floating")) {
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s390_pci_force_floating = 1;
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return NULL;
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@ -881,7 +886,7 @@ static int __init pci_base_init(void)
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if (!test_facility(69) || !test_facility(71))
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return 0;
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if (test_facility(153))
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if (test_facility(153) && !s390_pci_no_mio)
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static_branch_enable(&have_mio);
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rc = zpci_debug_init();
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