Introduce a new weak pcibios_msi_controller() to
get the associate msi_chip for PCI bus. This is
preparation for save msi_chip in arch PCI sysdata.
This weak function will be removed after we save
msi_chip in generic pci_host_bridge.
Suggested-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
drivers/pci/msi.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 1c7ca4a..f085f7f 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -30,9 +30,24 @@ int pci_msi_ignore_mask;
/* Arch hooks */
+struct msi_controller * __weak pcibios_msi_controller(struct pci_bus *bus)
+{
+ return NULL;
+}
+
+struct msi_controller *pci_msi_controller(struct pci_bus *bus)
+{
+ struct msi_controller *ctrl = bus->msi;
+
+ if (ctrl)
+ return ctrl;
+
+ return pcibios_msi_controller(bus);
+}
+
int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
- struct msi_controller *ctrl = dev->bus->msi;
+ struct msi_controller *ctrl = pci_msi_controller(dev->bus);
int err;
if (!ctrl || !ctrl->setup_irq)
@@ -48,7 +63,7 @@ int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
void __weak arch_teardown_msi_irq(unsigned int irq)
{
struct msi_desc *entry = irq_get_msi_desc(irq);
- struct msi_controller *ctrl = entry->dev->bus->msi;
+ struct msi_controller *ctrl = pci_msi_controller(entry->dev->bus);
if (!ctrl || !ctrl->teardown_irq)
return;
--
1.7.1
--
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