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| author | Jan Glauber <jang@linux.vnet.ibm.com> | 2012-11-29 16:05:05 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-11-30 20:47:21 +0400 |
| commit | 9a4da8a5b109906a64bed5aaeb83bf4edb1f5888 (patch) | |
| tree | 2788d7c8fe3e90333555435c7539d9f31d2c520e /arch/s390/pci/pci_clp.c | |
| parent | e56e4e87e370a0f121450d52337969aa1be21ff7 (diff) | |
| download | linux-9a4da8a5b109906a64bed5aaeb83bf4edb1f5888.tar.xz | |
s390/pci: PCI adapter interrupts for MSI/MSI-X
Support PCI adapter interrupts using the Single-IRQ-mode. Single-IRQ-mode
disables an adapter IRQ automatically after delivering it until the SIC
instruction enables it again. This is used to reduce the number of IRQs
for streaming workloads.
Up to 64 MSI handlers can be registered per PCI function.
A hash table is used to map interrupt numbers to MSI descriptors.
The interrupt vector is scanned using the flogr instruction.
Only MSI/MSI-X interrupts are supported, no legacy INTs.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci/pci_clp.c')
| -rw-r--r-- | arch/s390/pci/pci_clp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c index 291da1a96560..72694fb6d525 100644 --- a/arch/s390/pci/pci_clp.c +++ b/arch/s390/pci/pci_clp.c @@ -48,6 +48,9 @@ static void clp_free_block(void *ptr) static void clp_store_query_pci_fngrp(struct zpci_dev *zdev, struct clp_rsp_query_pci_grp *response) { + zdev->msi_addr = response->msia; + + pr_debug("Supported number of MSI vectors: %u\n", response->noi); switch (response->version) { case 1: zdev->max_bus_speed = PCIE_SPEED_5_0GT; |