[PATCH 6/7] pci: function to retrieve alignment of p2p bars
From: Gavin Shan <hidden>
Date: 2012-06-29 06:48:49
Also in:
linux-pci
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
The patch introduces function pci_align_boundary() to retrieve the minimal alignment of p2p bars according to the argument. Signed-off-by: Gavin Shan <redacted> --- drivers/pci/host-bridge.c | 24 ++++++++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 25 insertions(+)
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
index 1854a2d..dc9a95e 100644
--- a/drivers/pci/host-bridge.c
+++ b/drivers/pci/host-bridge.c@@ -105,3 +105,27 @@ void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, } EXPORT_SYMBOL(pcibios_bus_to_resource); + +resource_size_t pci_align_boundary(struct pci_bus *bus, unsigned long flags) +{ + resource_size_t align = 0; + struct pci_host_bridge *bridge = find_pci_host_bridge(bus); + + flags &= (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH); + switch (flags) { + case IORESOURCE_IO: + align = (1 << bridge->io_align_shift); + break; + case IORESOURCE_MEM: + align = (1 << bridge->mem_align_shift); + break; + case (IORESOURCE_MEM | IORESOURCE_PREFETCH): + align = (1 << bridge->pmem_align_shift); + break; + default: + printk(KERN_WARNING "%s: invalid flags 0x%lx\n", + __func__, flags); + } + + return align; +}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 2b2b38d..64523ef 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h@@ -673,6 +673,7 @@ void __pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, struct pci_bus_region *region); void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, struct pci_bus_region *region); +resource_size_t pci_align_boundary(struct pci_bus *bus, unsigned long flags); void pcibios_scan_specific_bus(int busn); extern struct pci_bus *pci_find_bus(int domain, int busnr); void pci_bus_add_devices(const struct pci_bus *bus);
--
1.7.9.5