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16d917b130
linux/drivers/pci
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Bjorn Helgaas 16d917b130 PCI: Don't attempt to claim shadow copies of ROM 
If we're using a shadow copy of a PCI device ROM, the shadow copy is in RAM
and the device never sees accesses to it and doesn't respond to it.  We
don't have to route the shadow range to the PCI device, and the device
doesn't have to claim the range.

Previously we treated the shadow copy as though it were the ROM BAR, and we
failed to claim it because the region wasn't routed to the device:

  pci 0000:01:00.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
  pci_bus 0000:01: Allocating resources
  pci 0000:01:00.0: can't claim BAR 6 [mem 0x000c0000-0x000dffff]: no compatible bridge window

The failure path of pcibios_allocate_dev_rom_resource() cleared out the
resource start address, which also caused the following ioremap() warning:

  WARNING: CPU: 0 PID: 116 at /build/linux-akdJXO/linux-4.8.0/arch/x86/mm/ioremap.c:121 __ioremap_caller+0x1ec/0x370
  ioremap on RAM at 0x0000000000000000 - 0x000000000001ffff

Handle an option ROM shadow copy as RAM, without trying to insert it into
the iomem resource tree.

This fixes a regression caused by 0c0e0736ac ("PCI: Set ROM shadow
location in arch code, not in PCI core"), which appeared in v4.6.  The
regression causes video device initialization to fail.  This was reported
on AMD Turks, but it likely affects others as well.

Fixes: 0c0e0736ac ("PCI: Set ROM shadow location in arch code, not in PCI core")
Reported-and-tested-by: Vecu Bosseur <vecu.bosseur@gmail.com>
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627496
Link: https://bugzilla.kernel.org/show_bug.cgi?id=175391
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1352272
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v4.6+
2016-11-08 14:25:24 -06:00
..
host PCI: designware: Check for iATU unroll support after initializing host 2016-11-04 15:28:55 -05:00
hotplug powerpc updates for 4.9 2016-10-07 20:19:31 -07:00
pcie Merge branch 'pci/aer' into next 2016-10-03 09:42:57 -05:00
access.c
ats.c
bus.c
ecam.c
host-bridge.c cxl: use pcibios_free_controller_deferred() when removing vPHBs 2016-08-22 11:09:33 +10:00
hotplug-pci.c
htirq.c
iov.c PCI: Check for pci_setup_device() failure in pci_iov_add_virtfn() 2016-09-12 16:23:38 -05:00
irq.c
Kconfig PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for ARC 2016-09-06 10:53:32 -05:00
Makefile
msi.c Merge branch 'irq/for-block' into irq/core 2016-09-15 20:54:40 +02:00
of.c
pci-acpi.c PCI: Query platform firmware for device power state 2016-09-28 11:46:51 -05:00
pci-driver.c Merge branch 'pci/pm' into next 2016-10-03 09:43:21 -05:00
pci-label.c
pci-mid.c x86/platform/intel-mid: Add Intel Penwell to ID table 2016-09-08 14:07:53 +02:00
pci-stub.c
pci-sysfs.c
pci.c PCI changes for the v4.9 merge window: 2016-10-07 11:46:37 -07:00
pci.h Merge branch 'pci/pm' into next 2016-10-03 09:43:21 -05:00
probe.c Merge branch 'pci/aer' into next 2016-10-03 09:42:57 -05:00
proc.c
quirks.c Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2016-10-10 14:04:16 -07:00
remove.c PCI: Fix bridge_d3 update on device removal 2016-09-13 16:00:18 -05:00
rom.c
search.c
setup-bus.c x86/ioapic: Ignore root bridges without a companion ACPI device 2016-09-10 20:30:31 +02:00
setup-irq.c
setup-res.c PCI: Don't attempt to claim shadow copies of ROM 2016-11-08 14:25:24 -06:00
slot.c
syscall.c
vc.c
vpd.c
xen-pcifront.c