[PATCH v4 01/21] pci: Add pcibios_setup_bridge()

[Gavin Shan]

Currently, PowerPC PowerNV platform utilizes ppc_md.pcibios_fixup(),
which is called for once after PCI probing and resource assignment
are completed, to allocate platform required resources for PCI devices:
PE#, IO and MMIO mapping, DMA address translation (TCE) table etc.
Obviously, it's not hotplug friendly.

The patch adds weak function pcibios_setup_bridge(), which is called
by pci_setup_bridge(). PowerPC PowerNV platform will reuse the function
to assign above platform required resources to newly added PCI devices,
in order to support PCI hotplug on PowerPC PowerNV platform.

Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
 drivers/pci/setup-bus.c | 12 +++++++++---
 include/linux/pci.h     |  1 +
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 4fd0cac..a7d0c3c 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -674,7 +674,8 @@ static void pci_setup_bridge_mmio_pref(struct pci_dev *bridge)
 	pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
 }
 
-static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
+
+void pci_setup_bridge_resources(struct pci_bus *bus, unsigned long type)
 {
 	struct pci_dev *bridge = bus->self;
 
@@ -693,12 +694,17 @@ static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
 	pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
 }
 
+void __weak pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
+{
+	pci_setup_bridge_resources(bus, type);
+}
+
 void pci_setup_bridge(struct pci_bus *bus)
 {
 	unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
 				  IORESOURCE_PREFETCH;
 
-	__pci_setup_bridge(bus, type);
+	pcibios_setup_bridge(bus, type);
 }
 
 
@@ -1467,7 +1473,7 @@ static void pci_bridge_release_resources(struct pci_bus *bus,
 		/* avoiding touch the one without PREF */
 		if (type & IORESOURCE_PREFETCH)
 			type = IORESOURCE_PREFETCH;
-		__pci_setup_bridge(bus, type);
+		pci_setup_bridge_resources(bus, type);
 		/* for next child res under same bridge */
 		r->flags = old_flags;
 	}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 353db8d..68c5ef9 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1175,6 +1175,7 @@ void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
 		  void *userdata);
 int pci_cfg_space_size(struct pci_dev *dev);
 unsigned char pci_bus_max_busnr(struct pci_bus *bus);
+void pci_setup_bridge_resources(struct pci_bus *bus, unsigned long type);
 void pci_setup_bridge(struct pci_bus *bus);
 resource_size_t pcibios_window_alignment(struct pci_bus *bus,
 					 unsigned long type);
-- 
2.1.0