aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/powernv/pci-ioda.c
diff options
context:
space:
mode:
authorGavin Shan <shangw@linux.vnet.ibm.com>2013-04-25 19:20:59 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-04-26 16:09:59 +1000
commit137436c9a6ee385c883db09e41af763888ee7642 (patch)
tree251fb4b23142e8dc05a5824359ba73e383b0434d /arch/powerpc/platforms/powernv/pci-ioda.c
parenta486bdb0e9da8d876d6ff4efc3138d35e141c0b5 (diff)
downloadvexpress-lsk-137436c9a6ee385c883db09e41af763888ee7642.tar.gz
powerpc/powernv: Patch MSI EOI handler on P8
The EOI handler of MSI/MSI-X interrupts for P8 (PHB3) need additional steps to handle the P/Q bits in IVE before EOIing the corresponding interrupt. The patch changes the EOI handler to cover that. we have individual IRQ chip in each PHB instance. During the MSI IRQ setup time, the IRQ chip is copied over from the original one for that IRQ, and the EOI handler is patched with the one that will handle the P/Q bits (As Ben suggested). Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/powernv/pci-ioda.c')
-rw-r--r--arch/powerpc/platforms/powernv/pci-ioda.c38
1 files changed, 36 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 3d4e9588a69..3f88c51cb95 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -31,6 +31,7 @@
#include <asm/opal.h>
#include <asm/iommu.h>
#include <asm/tce.h>
+#include <asm/xics.h>
#include "powernv.h"
#include "pci.h"
@@ -589,11 +590,27 @@ static void pnv_ioda_setup_dma(struct pnv_phb *phb)
}
#ifdef CONFIG_PCI_MSI
+static void pnv_ioda2_msi_eoi(struct irq_data *d)
+{
+ unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
+ struct irq_chip *chip = irq_data_get_irq_chip(d);
+ struct pnv_phb *phb = container_of(chip, struct pnv_phb,
+ ioda.irq_chip);
+ int64_t rc;
+
+ rc = opal_pci_msi_eoi(phb->opal_id, hw_irq);
+ WARN_ON_ONCE(rc);
+
+ icp_native_eoi(d);
+}
+
static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
- unsigned int hwirq, unsigned int is_64,
- struct msi_msg *msg)
+ unsigned int hwirq, unsigned int virq,
+ unsigned int is_64, struct msi_msg *msg)
{
struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
+ struct irq_data *idata;
+ struct irq_chip *ichip;
unsigned int xive_num = hwirq - phb->msi_base;
uint64_t addr64;
uint32_t addr32, data;
@@ -638,6 +655,23 @@ static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
}
msg->data = data;
+ /*
+ * Change the IRQ chip for the MSI interrupts on PHB3.
+ * The corresponding IRQ chip should be populated for
+ * the first time.
+ */
+ if (phb->type == PNV_PHB_IODA2) {
+ if (!phb->ioda.irq_chip_init) {
+ idata = irq_get_irq_data(virq);
+ ichip = irq_data_get_irq_chip(idata);
+ phb->ioda.irq_chip_init = 1;
+ phb->ioda.irq_chip = *ichip;
+ phb->ioda.irq_chip.irq_eoi = pnv_ioda2_msi_eoi;
+ }
+
+ irq_set_chip(virq, &phb->ioda.irq_chip);
+ }
+
pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d),"
" address=%x_%08x data=%x PE# %d\n",
pci_name(dev), is_64 ? "64" : "32", hwirq, xive_num,