diff options
| author |   Sebastian Ott <sebott@linux.ibm.com> | 2019-02-26 16:07:32 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-29 10:47:01 +0200 |
| commit | fbfe07d440f2c55070a0358f66560bb4f9fb92e7 (patch) | |
| tree | f5c7e9d68381f75f625126383c4a8b77c386f657 | |
| parent | s390/pci: gather statistics for floating vs directed irqs (diff) | |
| download | linux-dev-fbfe07d440f2c55070a0358f66560bb4f9fb92e7.tar.xz linux-dev-fbfe07d440f2c55070a0358f66560bb4f9fb92e7.zip | |
s390/pci: add parameter to force floating irqs
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>
Diffstat (limited to '')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 1 | ||||
| -rw-r--r-- | arch/s390/include/asm/pci.h | 1 | ||||
| -rw-r--r-- | arch/s390/pci/pci.c | 5 | ||||
| -rw-r--r-- | arch/s390/pci/pci_irq.c | 3 |
4 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 2b8ee90bb644..abc1b6e305c4 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -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. diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index a285754d0742..328013219aec 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -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 diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index 716e773af788..db096fd16f46 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -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; } diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c index c73ab855a2ca..d80616ae8dd8 100644 --- a/arch/s390/pci/pci_irq.c +++ b/arch/s390/pci/pci_irq.c @@ -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; |