688d191821
The reason we have PCIBIOS_MIN_IO and PCIBIOS_MIN_CARDBUS_IO is because we want to protect badly documented motherboard PCI resources and thus don't want to allocate new resources in low IO/MEM space. However, if we have already discovered a PCI bridge with a specified resource base, that should override that decision. This change will allow us to move the "careful" region upwards without resulting in problems allocating resources in low mappings. This was brought on by us having allocated a bus resource at 0x1000, conflicting with a undocumented VAIO Sony PI resources.
156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/*
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* drivers/pci/bus.c
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*
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* From setup-res.c, by:
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* Dave Rusling (david.rusling@reo.mts.dec.com)
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* David Mosberger (davidm@cs.arizona.edu)
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* David Miller (davem@redhat.com)
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* Ivan Kokshaysky (ink@jurassic.park.msu.ru)
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include "pci.h"
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/**
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* pci_bus_alloc_resource - allocate a resource from a parent bus
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* @bus: PCI bus
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* @res: resource to allocate
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* @size: size of resource to allocate
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* @align: alignment of resource to allocate
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* @min: minimum /proc/iomem address to allocate
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* @type_mask: IORESOURCE_* type flags
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* @alignf: resource alignment function
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* @alignf_data: data argument for resource alignment function
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*
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* Given the PCI bus a device resides on, the size, minimum address,
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* alignment and type, try to find an acceptable resource allocation
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* for a specific device resource.
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*/
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int
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pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
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unsigned long size, unsigned long align, unsigned long min,
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unsigned int type_mask,
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void (*alignf)(void *, struct resource *,
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unsigned long, unsigned long),
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void *alignf_data)
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{
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int i, ret = -ENOMEM;
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type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
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for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
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struct resource *r = bus->resource[i];
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if (!r)
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continue;
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/* type_mask must match */
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if ((res->flags ^ r->flags) & type_mask)
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continue;
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/* We cannot allocate a non-prefetching resource
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from a pre-fetching area */
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if ((r->flags & IORESOURCE_PREFETCH) &&
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!(res->flags & IORESOURCE_PREFETCH))
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continue;
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/* Ok, try it out.. */
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ret = allocate_resource(r, res, size,
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r->start ? : min,
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-1, align,
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alignf, alignf_data);
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if (ret == 0)
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break;
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}
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return ret;
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}
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/**
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* add a single device
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* @dev: device to add
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*
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* This adds a single pci device to the global
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* device list and adds sysfs and procfs entries
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*/
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void __devinit pci_bus_add_device(struct pci_dev *dev)
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{
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device_add(&dev->dev);
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spin_lock(&pci_bus_lock);
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list_add_tail(&dev->global_list, &pci_devices);
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spin_unlock(&pci_bus_lock);
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pci_proc_attach_device(dev);
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pci_create_sysfs_dev_files(dev);
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}
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/**
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* pci_bus_add_devices - insert newly discovered PCI devices
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* @bus: bus to check for new devices
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*
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* Add newly discovered PCI devices (which are on the bus->devices
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* list) to the global PCI device list, add the sysfs and procfs
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* entries. Where a bridge is found, add the discovered bus to
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* the parents list of child buses, and recurse (breadth-first
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* to be compatible with 2.4)
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*
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* Call hotplug for each new devices.
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*/
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void __devinit pci_bus_add_devices(struct pci_bus *bus)
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{
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struct pci_dev *dev;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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/*
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* Skip already-present devices (which are on the
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* global device list.)
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*/
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if (!list_empty(&dev->global_list))
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continue;
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pci_bus_add_device(dev);
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}
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list_for_each_entry(dev, &bus->devices, bus_list) {
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BUG_ON(list_empty(&dev->global_list));
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/*
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* If there is an unattached subordinate bus, attach
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* it and then scan for unattached PCI devices.
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*/
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if (dev->subordinate) {
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if (list_empty(&dev->subordinate->node)) {
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spin_lock(&pci_bus_lock);
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list_add_tail(&dev->subordinate->node,
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&dev->bus->children);
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spin_unlock(&pci_bus_lock);
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}
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pci_bus_add_devices(dev->subordinate);
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sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");
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}
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}
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}
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void pci_enable_bridges(struct pci_bus *bus)
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{
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struct pci_dev *dev;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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if (dev->subordinate) {
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pci_enable_device(dev);
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pci_set_master(dev);
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pci_enable_bridges(dev->subordinate);
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}
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}
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}
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EXPORT_SYMBOL(pci_bus_alloc_resource);
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EXPORT_SYMBOL_GPL(pci_bus_add_device);
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EXPORT_SYMBOL(pci_bus_add_devices);
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EXPORT_SYMBOL(pci_enable_bridges);
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