[Xen-devel] [PATCH 10/16] Powerpc/MSI: Use MSI controller framework to configure MSI/MSI-X irq

[Yijing Wang <wangyijing@xxxxxxxxxx>]

Use MSI controller framework instead of arch MSI functions to configure
MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework.

Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
---
 arch/powerpc/include/asm/pci-bridge.h |    8 ++++++++
 arch/powerpc/kernel/msi.c             |   19 +++++++++++++++++--
 arch/powerpc/kernel/pci-common.c      |    3 +++
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/pci-bridge.h 
b/arch/powerpc/include/asm/pci-bridge.h
index 4ca90a3..f7d09d0 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -32,6 +32,10 @@ struct pci_controller {
        int self_busno;
        struct resource busn;
 
+#ifdef CONFIG_PCI_MSI
+       struct msi_controller *msi_ctrl;
+#endif
+
        void __iomem *io_base_virt;
 #ifdef CONFIG_PPC64
        void *io_base_alloc;
@@ -94,6 +98,10 @@ struct pci_controller {
        void *private_data;
 };
 
+#ifdef CONFIG_PCI_MSI
+extern struct msi_controller ppc_msi_ctrl;
+#endif
+
 /* These are used for config access before all the PCI probing
    has been done. */
 extern int early_read_config_byte(struct pci_controller *hose, int bus,
diff --git a/arch/powerpc/kernel/msi.c b/arch/powerpc/kernel/msi.c
index 71bd161..64a16f3 100644
--- a/arch/powerpc/kernel/msi.c
+++ b/arch/powerpc/kernel/msi.c
@@ -13,7 +13,15 @@
 
 #include <asm/machdep.h>
 
-int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+struct msi_controller *pcibios_msi_controller(struct pci_bus *bus)
+{
+       struct pci_controller *hose = bus->sysdata;
+
+       return hose->msi_ctrl;
+}
+
+static int ppc_setup_msi_irqs(struct msi_controller *ctrl,
+               struct pci_dev *dev, int nvec, int type)
 {
        if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
                pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
@@ -27,7 +35,13 @@ int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int 
type)
        return ppc_md.setup_msi_irqs(dev, nvec, type);
 }
 
-void arch_teardown_msi_irqs(struct pci_dev *dev)
+static void ppc_teardown_msi_irqs(struct msi_controller *ctrl,
+               struct pci_dev *dev)
 {
        ppc_md.teardown_msi_irqs(dev);
 }
+
+struct msi_controller ppc_msi_ctrl = {
+       .setup_irqs = ppc_setup_msi_irqs,
+       .teardown_irqs = ppc_teardown_msi_irqs,
+};
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index e5dad9a..c3f28c5 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1597,6 +1597,9 @@ void pcibios_scan_phb(struct pci_controller *hose)
        /* Wire up PHB bus resources */
        pcibios_setup_phb_resources(hose, &resources);
 
+#ifdef CONFIG_PCI_MSI
+       hose->msi_ctrl = &ppc_msi_ctrl;
+#endif
        hose->busn.start = hose->first_busno;
        hose->busn.end   = hose->last_busno;
        hose->busn.flags = IORESOURCE_BUS;
-- 
1.7.1


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