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authorJan Glauber <jang@linux.vnet.ibm.com>2012-11-29 13:05:05 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-11-30 17:47:21 +0100
commit9a4da8a5b109906a64bed5aaeb83bf4edb1f5888 (patch)
tree2788d7c8fe3e90333555435c7539d9f31d2c520e /drivers
parente56e4e87e370a0f121450d52337969aa1be21ff7 (diff)
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 'drivers')
-rw-r--r--drivers/pci/msi.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index a825d78fd0a..5099636a6e5 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -207,6 +207,8 @@ static void msix_mask_irq(struct msi_desc *desc, u32 flag)
desc->masked = __msix_mask_irq(desc, flag);
}
+#ifdef CONFIG_GENERIC_HARDIRQS
+
static void msi_set_mask_bit(struct irq_data *data, u32 flag)
{
struct msi_desc *desc = irq_data_get_msi(data);
@@ -230,6 +232,8 @@ void unmask_msi_irq(struct irq_data *data)
msi_set_mask_bit(data, 0);
}
+#endif /* CONFIG_GENERIC_HARDIRQS */
+
void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
BUG_ON(entry->dev->current_state != PCI_D0);
@@ -337,8 +341,10 @@ static void free_msi_irqs(struct pci_dev *dev)
if (!entry->irq)
continue;
nvec = 1 << entry->msi_attrib.multiple;
+#ifdef CONFIG_GENERIC_HARDIRQS
for (i = 0; i < nvec; i++)
BUG_ON(irq_has_action(entry->irq + i));
+#endif
}
arch_teardown_msi_irqs(dev);