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PCI: Add pci_scan_root_bus_msi()

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Add a pci_scan_root_bus_msi() interface so an arch can specify the MSI
controller up front.  This removes the need for a pcibios callback to set
the MSI controller later.

This is not exported because I'd like to replace the variety of "scan root
bus" interfaces with a single, more extensible interface that can handle
the MSI controller, domain, pci_ops, resources, etc.  I hope this interface
is temporary.

[bhelgaas: changelog, split into separate patch]
Suggested-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jingoo Han <jingoohan1@gmail.com>
This commit is contained in:
Lorenzo Pieralisi 2015-08-03 21:27:10 -05:00 committed by Bjorn Helgaas
parent ada8b675b7
commit d2a7926d42
2 changed files with 16 additions and 2 deletions
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14
drivers/pci/probe.c
View File

@ -2096,8 +2096,9 @@ void pci_bus_release_busn_res(struct pci_bus *b)
res, ret ? "can not be" : "is");
}
struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata, struct list_head *resources)
struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources, struct msi_controller *msi)
{
struct resource_entry *window;
bool found = false;
@ -2114,6 +2115,8 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
if (!b)
return NULL;
b->msi = msi;
if (!found) {
dev_info(&b->dev,
"No busn resource found for root bus, will use [bus %02x-ff]\n",
@ -2128,6 +2131,13 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
return b;
}
struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata, struct list_head *resources)
{
return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources,
NULL);
}
EXPORT_SYMBOL(pci_scan_root_bus);
struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,

4
include/linux/pci.h
View File

@ -787,6 +787,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
void pci_bus_release_busn_res(struct pci_bus *b);
struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources,
struct msi_controller *msi);
struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);