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>

2 files changed, 3 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index a4b28f165b6c..b6c8b58b1d76 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -117,6 +117,7 @@ extern int opal_enter_rtas(struct rtas_args *args,
 #define OPAL_SET_SLOT_LED_STATUS                55
 #define OPAL_GET_EPOW_STATUS                    56
 #define OPAL_SET_SYSTEM_ATTENTION_LED           57
+#define OPAL_PCI_MSI_EOI                        63
 
 #ifndef __ASSEMBLY__
 
@@ -506,6 +507,7 @@ int64_t opal_pci_get_xive_reissue(uint64_t phb_id, uint32_t xive_number,
                                   uint8_t *p_bit, uint8_t *q_bit);
 int64_t opal_pci_set_xive_reissue(uint64_t phb_id, uint32_t xive_number,
                                   uint8_t p_bit, uint8_t q_bit);
+int64_t opal_pci_msi_eoi(uint64_t phb_id, uint32_t hw_irq);
 int64_t opal_pci_set_xive_pe(uint64_t phb_id, uint32_t pe_number,
                              uint32_t xive_num);
 int64_t opal_get_xive_source(uint64_t phb_id, uint32_t xive_num,
diff --git a/arch/powerpc/include/asm/xics.h b/arch/powerpc/include/asm/xics.h
index 4ae9a09c3b89..282d43a0c855 100644
--- a/arch/powerpc/include/asm/xics.h
+++ b/arch/powerpc/include/asm/xics.h
@@ -150,6 +150,7 @@ extern void xics_register_ics(struct ics *ics);
 extern void xics_teardown_cpu(void);
 extern void xics_kexec_teardown_cpu(int secondary);
 extern void xics_migrate_irqs_away(void);
+extern void icp_native_eoi(struct irq_data *d);
 #ifdef CONFIG_SMP
 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
                                unsigned int strict_check);