![Eric W. Biederman](/assets/img/avatar_default.png)
So I think the right solution is to simply make pci_enable_device just flip enable bits and move the rest of the work someplace else. However a thorough cleanup is a little extreme for this point in the release cycle, so I think a quick hack that makes the code not stomp the irq when msi irq's are enabled should be the first fix. Then we can later make the code not change the irqs at all. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
447 lines
10 KiB
C
447 lines
10 KiB
C
/*
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* Low-Level PCI Support for PC
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*
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* (c) 1999--2000 Martin Mares <mj@ucw.cz>
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*/
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/dmi.h>
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#include <asm/acpi.h>
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#include <asm/segment.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include "pci.h"
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unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
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PCI_PROBE_MMCONF;
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static int pci_bf_sort;
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int pci_routeirq;
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int pcibios_last_bus = -1;
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unsigned long pirq_table_addr;
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struct pci_bus *pci_root_bus;
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struct pci_raw_ops *raw_pci_ops;
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static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
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{
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return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
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}
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static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
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{
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return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
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}
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struct pci_ops pci_root_ops = {
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.read = pci_read,
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.write = pci_write,
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};
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/*
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* legacy, numa, and acpi all want to call pcibios_scan_root
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* from their initcalls. This flag prevents that.
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*/
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int pcibios_scanned;
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/*
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* This interrupt-safe spinlock protects all accesses to PCI
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* configuration space.
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*/
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DEFINE_SPINLOCK(pci_config_lock);
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/*
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* Several buggy motherboards address only 16 devices and mirror
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* them to next 16 IDs. We try to detect this `feature' on all
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* primary buses (those containing host bridges as they are
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* expected to be unique) and remove the ghost devices.
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*/
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static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
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{
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struct list_head *ln, *mn;
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struct pci_dev *d, *e;
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int mirror = PCI_DEVFN(16,0);
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int seen_host_bridge = 0;
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int i;
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DBG("PCI: Scanning for ghost devices on bus %d\n", b->number);
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list_for_each(ln, &b->devices) {
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d = pci_dev_b(ln);
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if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
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seen_host_bridge++;
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for (mn=ln->next; mn != &b->devices; mn=mn->next) {
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e = pci_dev_b(mn);
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if (e->devfn != d->devfn + mirror ||
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e->vendor != d->vendor ||
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e->device != d->device ||
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e->class != d->class)
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continue;
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for(i=0; i<PCI_NUM_RESOURCES; i++)
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if (e->resource[i].start != d->resource[i].start ||
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e->resource[i].end != d->resource[i].end ||
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e->resource[i].flags != d->resource[i].flags)
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continue;
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break;
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}
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if (mn == &b->devices)
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return;
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}
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if (!seen_host_bridge)
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return;
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printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number);
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ln = &b->devices;
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while (ln->next != &b->devices) {
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d = pci_dev_b(ln->next);
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if (d->devfn >= mirror) {
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list_del(&d->global_list);
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list_del(&d->bus_list);
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kfree(d);
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} else
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ln = ln->next;
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}
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}
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/*
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* Called after each bus is probed, but before its children
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* are examined.
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*/
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void __devinit pcibios_fixup_bus(struct pci_bus *b)
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{
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pcibios_fixup_ghosts(b);
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pci_read_bridge_bases(b);
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}
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/*
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* Only use DMI information to set this if nothing was passed
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* on the kernel command line (which was parsed earlier).
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*/
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static int __devinit set_bf_sort(struct dmi_system_id *d)
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{
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if (pci_bf_sort == pci_bf_sort_default) {
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pci_bf_sort = pci_dmi_bf;
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printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
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}
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return 0;
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}
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/*
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* Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
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*/
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#ifdef __i386__
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static int __devinit assign_all_busses(struct dmi_system_id *d)
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{
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pci_probe |= PCI_ASSIGN_ALL_BUSSES;
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printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
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" (pci=assign-busses)\n", d->ident);
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return 0;
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}
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#endif
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static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
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#ifdef __i386__
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/*
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* Laptops which need pci=assign-busses to see Cardbus cards
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*/
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{
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.callback = assign_all_busses,
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.ident = "Samsung X20 Laptop",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
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DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
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},
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},
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#endif /* __i386__ */
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 1950",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 1955",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 2900",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 2950",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge R900",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL20p G3",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL20p G4",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL30p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL25p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL35p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL45p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL45p G2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL460c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL465c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL480c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL685c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
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},
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},
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{}
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};
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struct pci_bus * __devinit pcibios_scan_root(int busnum)
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{
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struct pci_bus *bus = NULL;
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dmi_check_system(pciprobe_dmi_table);
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while ((bus = pci_find_next_bus(bus)) != NULL) {
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if (bus->number == busnum) {
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/* Already scanned */
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return bus;
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}
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}
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printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
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return pci_scan_bus_parented(NULL, busnum, &pci_root_ops, NULL);
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}
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extern u8 pci_cache_line_size;
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static int __init pcibios_init(void)
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{
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struct cpuinfo_x86 *c = &boot_cpu_data;
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if (!raw_pci_ops) {
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printk(KERN_WARNING "PCI: System does not support PCI\n");
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return 0;
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}
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/*
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* Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
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* and P4. It's also good for 386/486s (which actually have 16)
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* as quite a few PCI devices do not support smaller values.
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*/
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pci_cache_line_size = 32 >> 2;
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if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
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pci_cache_line_size = 64 >> 2; /* K7 & K8 */
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else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
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pci_cache_line_size = 128 >> 2; /* P4 */
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pcibios_resource_survey();
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if (pci_bf_sort >= pci_force_bf)
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pci_sort_breadthfirst();
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#ifdef CONFIG_PCI_BIOS
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if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
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pcibios_sort();
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#endif
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return 0;
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}
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subsys_initcall(pcibios_init);
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char * __devinit pcibios_setup(char *str)
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{
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if (!strcmp(str, "off")) {
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pci_probe = 0;
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return NULL;
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} else if (!strcmp(str, "bfsort")) {
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pci_bf_sort = pci_force_bf;
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return NULL;
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} else if (!strcmp(str, "nobfsort")) {
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pci_bf_sort = pci_force_nobf;
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return NULL;
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}
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#ifdef CONFIG_PCI_BIOS
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else if (!strcmp(str, "bios")) {
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pci_probe = PCI_PROBE_BIOS;
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return NULL;
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} else if (!strcmp(str, "nobios")) {
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pci_probe &= ~PCI_PROBE_BIOS;
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return NULL;
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} else if (!strcmp(str, "nosort")) {
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pci_probe |= PCI_NO_SORT;
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return NULL;
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} else if (!strcmp(str, "biosirq")) {
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pci_probe |= PCI_BIOS_IRQ_SCAN;
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return NULL;
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} else if (!strncmp(str, "pirqaddr=", 9)) {
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pirq_table_addr = simple_strtoul(str+9, NULL, 0);
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return NULL;
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}
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#endif
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#ifdef CONFIG_PCI_DIRECT
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else if (!strcmp(str, "conf1")) {
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pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
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return NULL;
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}
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else if (!strcmp(str, "conf2")) {
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pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
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return NULL;
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}
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#endif
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#ifdef CONFIG_PCI_MMCONFIG
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else if (!strcmp(str, "nommconf")) {
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pci_probe &= ~PCI_PROBE_MMCONF;
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return NULL;
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}
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#endif
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else if (!strcmp(str, "noacpi")) {
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acpi_noirq_set();
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return NULL;
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}
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else if (!strcmp(str, "noearly")) {
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pci_probe |= PCI_PROBE_NOEARLY;
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return NULL;
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}
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#ifndef CONFIG_X86_VISWS
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else if (!strcmp(str, "usepirqmask")) {
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pci_probe |= PCI_USE_PIRQ_MASK;
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return NULL;
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} else if (!strncmp(str, "irqmask=", 8)) {
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pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
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return NULL;
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} else if (!strncmp(str, "lastbus=", 8)) {
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pcibios_last_bus = simple_strtol(str+8, NULL, 0);
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return NULL;
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}
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#endif
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else if (!strcmp(str, "rom")) {
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pci_probe |= PCI_ASSIGN_ROMS;
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return NULL;
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} else if (!strcmp(str, "assign-busses")) {
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pci_probe |= PCI_ASSIGN_ALL_BUSSES;
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return NULL;
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} else if (!strcmp(str, "routeirq")) {
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pci_routeirq = 1;
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return NULL;
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}
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return str;
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}
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unsigned int pcibios_assign_all_busses(void)
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{
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return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
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}
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int pcibios_enable_device(struct pci_dev *dev, int mask)
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{
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int err;
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if ((err = pcibios_enable_resources(dev, mask)) < 0)
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return err;
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if (!dev->msi_enabled)
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return pcibios_enable_irq(dev);
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return 0;
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}
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void pcibios_disable_device (struct pci_dev *dev)
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{
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if (!dev->msi_enabled && pcibios_disable_irq)
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pcibios_disable_irq(dev);
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}
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