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@xxxxxxxxxxxxxxxxxx>
---
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
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