Thread (103 messages) 103 messages, 7 authors, 2016-05-02
STALE3740d REVIEWED: 3 (3M)
Revisions (4)
  1. v7 [diff vs current]
  2. v8 current
  3. v9 [diff vs current]
  4. v10 [diff vs current]

[PATCH v8 01/45] PCI: Add pcibios_setup_bridge()

From: Gavin Shan <hidden>
Date: 2016-02-17 03:43:44
Also in: linux-pci, linuxppc-dev
Subsystem: pci subsystem, the rest · Maintainers: Bjorn Helgaas, Linus Torvalds

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.

This 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 plugged PCI devices
during PCI hotplug in subsequent patches.

Signed-off-by: Gavin Shan <redacted>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/setup-bus.c | 5 +++++
 include/linux/pci.h     | 1 +
 2 files changed, 6 insertions(+)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 7796d0a..acda514 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -696,11 +696,16 @@ 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)
+{
+}
+
 void pci_setup_bridge(struct pci_bus *bus)
 {
 	unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
 				  IORESOURCE_PREFETCH;
 
+	pcibios_setup_bridge(bus, type);
 	__pci_setup_bridge(bus, type);
 }
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index bc435d62..8161c79 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -842,6 +842,7 @@ void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev);
 void pci_stop_root_bus(struct pci_bus *bus);
 void pci_remove_root_bus(struct pci_bus *bus);
 void pci_setup_cardbus(struct pci_bus *bus);
+void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type);
 void pci_sort_breadthfirst(void);
 #define dev_is_pci(d) ((d)->bus == &pci_bus_type)
 #define dev_is_pf(d) ((dev_is_pci(d) ? to_pci_dev(d)->is_physfn : false))
-- 
2.1.0
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