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s390/pci: add parameter to force floating irqs

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Provide a kernel parameter to force the usage of floating interrupts.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2019-02-26 16:07:32 +01:00 committed by Martin Schwidefsky
parent 07e3ec3acb
commit fbfe07d440
4 changed files with 10 additions and 0 deletions
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1
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3394,6 +3394,7 @@
bridges without forcing it upstream. Note:
this removes isolation between devices and
may put more devices in an IOMMU group.
force_floating [S390] Force usage of floating interrupts.
pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
Management.

1
arch/s390/include/asm/pci.h
View File

@ -163,6 +163,7 @@ static inline bool zdev_enabled(struct zpci_dev *zdev)
}
extern const struct attribute_group *zpci_attr_groups[];
extern unsigned int s390_pci_force_floating __initdata;
/* -----------------------------------------------------------------------------
Prototypes

5
arch/s390/pci/pci.c
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@ -741,6 +741,7 @@ static void zpci_mem_exit(void)
}
static unsigned int s390_pci_probe __initdata = 1;
unsigned int s390_pci_force_floating __initdata;
static unsigned int s390_pci_initialized;
char * __init pcibios_setup(char *str)
@ -749,6 +750,10 @@ char * __init pcibios_setup(char *str)
s390_pci_probe = 0;
return NULL;
}
if (!strcmp(str, "force_floating")) {
s390_pci_force_floating = 1;
return NULL;
}
return str;
}

3
arch/s390/pci/pci_irq.c
View File

@ -433,6 +433,9 @@ int __init zpci_irq_init(void)
int rc;
irq_delivery = sclp.has_dirq ? DIRECTED : FLOATING;
if (s390_pci_force_floating)
irq_delivery = FLOATING;
if (irq_delivery == DIRECTED)
zpci_airq.handler = zpci_directed_irq_handler;