[PATCH v9 2/3] PCI: dwc: Add msi_host_isr() callback

[Kunihiko Hayashi]

This adds msi_host_isr() callback function support to describe
SoC-dependent service triggered by MSI.

For example, when AER interrupt is triggered by MSI, the callback function
reads SoC-dependent registers and detects that the interrupt is from AER,
and invoke AER interrupts related to MSI.

Cc: Marc Zyngier <m...@kernel.org>
Cc: Jingoo Han <jingooh...@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimen...@synopsys.com>
Signed-off-by: Kunihiko Hayashi <hayashi.kunih...@socionext.com>
Acked-by: Gustavo Pimentel <gustavo.pimen...@synopsys.com>
Reviewed-by: Rob Herring <r...@kernel.org>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 3 +++
 drivers/pci/controller/dwc/pcie-designware.h      | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c 
b/drivers/pci/controller/dwc/pcie-designware-host.c
index 8a84c005..b0316f9 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -61,6 +61,9 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
        irqreturn_t ret = IRQ_NONE;
        struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 
+       if (pp->ops->msi_host_isr)
+               pp->ops->msi_host_isr(pp);
+
        num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
 
        for (i = 0; i < num_ctrls; i++) {
diff --git a/drivers/pci/controller/dwc/pcie-designware.h 
b/drivers/pci/controller/dwc/pcie-designware.h
index 0207840..f656557 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -173,6 +173,7 @@ enum dw_pcie_device_mode {
 struct dw_pcie_host_ops {
        int (*host_init)(struct pcie_port *pp);
        int (*msi_host_init)(struct pcie_port *pp);
+       void (*msi_host_isr)(struct pcie_port *pp);
 };
 
 struct pcie_port {
-- 
2.7.4