linux-kernel - Re: [PATCH v1 00/12] PCI: Rework shadow ROM handling

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Date:	Fri, 11 Mar 2016 13:16:09 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Tony Luck <tony.luck@...el.com>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Bruno Prémont <bonbons@...ux-vserver.org>,
	Daniel Stone <daniel@...ishbar.org>,
	Alex Deucher <alexdeucher@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Subject: Re: [PATCH v1 00/12] PCI: Rework shadow ROM handling

On Tue, Mar 8, 2016 at 9:45 AM, Bjorn Helgaas <helgaas@...nel.org> wrote:
> On Thu, Mar 03, 2016 at 10:53:50AM -0600, Bjorn Helgaas wrote:
>> The purpose of this series is to:
>>
>>   - Fix the "BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment"
>>     messages reported by Linus [1], Andy [2], and others.
>>
>>   - Move arch-specific shadow ROM location knowledge, e.g.,
>>     0xC0000-0xDFFFF, from PCI core to arch code.
>>
>>   - Fix the ia64 and MIPS Loongson 3 oddity of keeping virtual
>>     addresses in shadow ROM struct resource (resources should always
>>     contain *physical* addresses).
>>
>>   - Remove now-unused IORESOURCE_ROM_COPY and IORESOURCE_ROM_BIOS_COPY
>>     flags.
>>
>> This series is based on v4.5-rc1, and it's available on my
>> pci/resource git branch (along with a couple tiny unrelated patches)
>> at [3].
>>
>> Bjorn
>>
>>
>> [1] http://lkml.kernel.org/r/CA+55aFyVMfTBB0oz_yx8+eQOEJnzGtCsYSj9QuhEpdZ9BHdq5A@mail.gmail.com
>> [2] http://lkml.kernel.org/r/CALCETrV+RwNPzxyL8UVNsrAGu-6cCzD_Cc9PFJT2NCTJPLZZiw@mail.gmail.com
>> [3] https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/resource
>>
>>
>> ---
>>
>> Bjorn Helgaas (12):
>>       PCI: Mark shadow copy of VGA ROM as IORESOURCE_PCI_FIXED
>>       PCI: Don't assign or reassign immutable resources
>>       PCI: Don't enable/disable ROM BAR if we're using a RAM shadow copy
>>       PCI: Set ROM shadow location in arch code, not in PCI core
>>       PCI: Clean up pci_map_rom() whitespace
>>       ia64/PCI: Use temporary struct resource * to avoid repetition
>>       ia64/PCI: Use ioremap() instead of open-coded equivalent
>>       ia64/PCI: Keep CPU physical (not virtual) addresses in shadow ROM resource
>>       MIPS: Loongson 3: Use temporary struct resource * to avoid repetition
>>       MIPS: Loongson 3: Keep CPU physical (not virtual) addresses in shadow ROM resource
>>       PCI: Remove unused IORESOURCE_ROM_COPY and IORESOURCE_ROM_BIOS_COPY
>>       PCI: Simplify sysfs ROM cleanup
>>
>>
>>  arch/ia64/pci/fixup.c              |   21 +++++++--
>>  arch/ia64/sn/kernel/io_acpi_init.c |   22 ++++++----
>>  arch/ia64/sn/kernel/io_init.c      |   51 ++++++++--------------
>>  arch/mips/pci/fixup-loongson3.c    |   19 +++++---
>>  arch/x86/pci/fixup.c               |   21 +++++++--
>>  drivers/pci/pci-sysfs.c            |   13 +-----
>>  drivers/pci/remove.c               |    1
>>  drivers/pci/rom.c                  |   83 +++++++++++-------------------------
>>  drivers/pci/setup-res.c            |    6 +++
>>  include/linux/ioport.h             |    4 --
>>  10 files changed, 111 insertions(+), 130 deletions(-)
>
> I applied this series to pci/resource for v4.6.

This gets rid of all the warnings for me until I try to read my i915
device's rom using sysfs.  Then I get:

i915 0000:00:02.0: Invalid PCI ROM header signature: expecting 0xaa55,
got 0xffff

So I suspect that something is still subtly wrong -- I'd imagine that
this should either work or the intialization code should detect that
there is no usable ROM and not expose it.

(To be clear, there's no regression here.)