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Commit fbfe07d4 authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
Browse files

s390/pci: add parameter to force floating irqs 



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

Signed-off-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 07e3ec3a

Documentation/admin-guide/kernel-parameters.txt

+1 −0
Original line number Diff line number Diff line
@@ -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.

arch/s390/include/asm/pci.h

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/pci/pci.c

+5 −0
Original line number Diff line number Diff line
@@ -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;

}

arch/s390/pci/pci_irq.c

+3 −0
Original line number Diff line number Diff line
@@ -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;