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

From: Yijing Wang
Date: Mon Oct 27 2014 - 08:47:47 EST


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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