[Xen-devel] [PATCH v2 07/22] PCI/MSI: Refactor struct msi_chip to make it become more common

[Yijing Wang <wangyijing@xxxxxxxxxx>]

Now there are a lot of __weak arch functions in MSI code.
These functions make MSI driver complex. Thierry Reding Introduced
a new MSI chip framework to configure MSI/MSI-X irq in ARM. Use
the new MSI chip framework to refactor all other platform MSI
arch code to eliminate weak arch MSI functions. This patch add
.restore_irq() and .setup_irqs() to make it become more common.

Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
 drivers/pci/msi.c   |   15 +++++++++++++++
 include/linux/msi.h |    3 +++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 3acbe65..d10edee 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -64,6 +64,11 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int 
nvec, int type)
 {
        struct msi_desc *entry;
        int ret;
+       struct msi_chip *chip;
+
+       chip = arch_find_msi_chip(dev);
+       if (chip && chip->setup_irqs)
+               return chip->setup_irqs(dev, nvec, type);
 
        /*
         * If an architecture wants to support multiple MSI, it needs to
@@ -106,6 +111,11 @@ void default_teardown_msi_irqs(struct pci_dev *dev)
 
 void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
 {
+       struct msi_chip *chip = arch_find_msi_chip(dev);
+
+       if (chip && chip->teardown_irqs)
+               return chip->teardown_irqs(dev);
+
        return default_teardown_msi_irqs(dev);
 }
 
@@ -129,6 +139,11 @@ static void default_restore_msi_irq(struct pci_dev *dev, 
int irq)
 
 void __weak arch_restore_msi_irqs(struct pci_dev *dev)
 {
+       struct msi_chip *chip = arch_find_msi_chip(dev);
+
+       if (chip && chip->restore_irqs)
+               return chip->restore_irqs(dev);
+
        return default_restore_msi_irqs(dev);
 }
 
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 6fdc5c6..4cf1f31 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -69,7 +69,10 @@ struct msi_chip {
        struct list_head list;
 
        int (*setup_irq)(struct pci_dev *dev, struct msi_desc *desc);
+       int (*setup_irqs)(struct pci_dev *dev, int nvec, int type);
        void (*teardown_irq)(unsigned int irq);
+       void (*teardown_irqs)(struct pci_dev *dev);
+       void (*restore_irqs)(struct pci_dev *dev);
 };
 
 #endif /* LINUX_MSI_H */
-- 
1.7.1


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