linux/drivers/pci
Bjorn Helgaas 58c84eda07 PCI: fall back to original BIOS BAR addresses
If we fail to assign resources to a PCI BAR, this patch makes us try the
original address from BIOS rather than leaving it disabled.

Linux tries to make sure all PCI device BARs are inside the upstream
PCI host bridge or P2P bridge apertures, reassigning BARs if necessary.
Windows does similar reassignment.

Before this patch, if we could not move a BAR into an aperture, we left
the resource unassigned, i.e., at address zero.  Windows leaves such BARs
at the original BIOS addresses, and this patch makes Linux do the same.

This is a bit ugly because we disable the resource long before we try to
reassign it, so we have to keep track of the BIOS BAR address somewhere.
For lack of a better place, I put it in the struct pci_dev.

I think it would be cleaner to attempt the assignment immediately when the
claim fails, so we could easily remember the original address.  But we
currently claim motherboard resources in the middle, after attempting to
claim PCI resources and before assigning new PCI resources, and changing
that is a fairly big job.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16263

Reported-by: Andrew <nitr0@seti.kr.ua>
Tested-by: Andrew <nitr0@seti.kr.ua>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2010-07-16 11:39:48 -07:00
..
hotplug PCI: hotplug/cpqphp, fix NULL dereference 2010-06-11 13:10:21 -07:00
pcie PCI/PM: Do not use native PCIe PME by default 2010-06-18 09:36:37 -07:00
.gitignore
access.c PCI: output FW warning in pci_read/write_vpd 2010-05-18 15:00:25 -07:00
bus.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
dmar.c Merge git://git.infradead.org/iommu-2.6 2010-05-21 17:25:01 -07:00
hotplug-pci.c
hotplug.c
htirq.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
intel-iommu.c intel-iommu: Force-disable IOMMU for iGFX on broken Cantiga revisions. 2010-06-15 10:57:57 +01:00
intr_remapping.c Merge git://git.infradead.org/iommu-2.6 2010-05-21 17:25:01 -07:00
intr_remapping.h
ioapic.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
iov.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
iova.c
irq.c
Kconfig PCI: change PCI_MSI help text to recommend enabling 2010-05-11 12:01:10 -07:00
Makefile microblaze: Enable PCI, missing files 2010-03-11 14:04:27 +01:00
msi.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
msi.h
pci-acpi.c Merge branch 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-03-01 10:36:22 -08:00
pci-driver.c PCI PM: Run-time callbacks for PCI bus type 2010-02-22 16:21:19 -08:00
pci-stub.c
pci-sysfs.c Revert "PCI: create function symlinks in /sys/bus/pci/slots/N/" 2010-06-11 13:08:37 -07:00
pci.c virtio-pci: disable msi at startup 2010-06-23 22:49:07 +09:30
pci.h PCI: make bitfield unsigned 2010-05-11 10:07:20 +02:00
probe.c ACPI, APEI, PCIE AER, use general HEST table parsing in AER firmware_first setup 2010-05-19 22:40:14 -04:00
proc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
quirks.c ahci: add pci quirk for JMB362 2010-06-07 16:03:10 -04:00
remove.c
rom.c
search.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
setup-bus.c Revert "PCI: update bridge resources to get more big ranges in PCI assign unssigned" 2010-05-12 18:39:45 -07:00
setup-irq.c
setup-res.c PCI: fall back to original BIOS BAR addresses 2010-07-16 11:39:48 -07:00
slot.c Revert "PCI: create function symlinks in /sys/bus/pci/slots/N/" 2010-06-11 13:08:37 -07:00
syscall.c
vpd.c pci: Add helper to search for VPD keywords 2010-02-28 00:43:33 -08:00