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Date:	Fri, 3 Apr 2015 20:34:52 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	David Ahern <david.ahern@...cle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [PATCH 1/3] PCI: Introduce pci_bus_addr_t

On Fri, Apr 3, 2015 at 1:52 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> [+cc Sam (commented on previous versions), Russell, linux-arm-kernel, Ralf,
> linux-mips, Ben, linuxppc-dev, x86]
>
> On Fri, Apr 03, 2015 at 02:32:34PM -0500, Bjorn Helgaas wrote:
>> On Tue, Mar 31, 2015 at 07:57:47PM -0700, Yinghai Lu wrote:
>> > David Ahern found commit d63e2e1f3df9 ("sparc/PCI: Clip bridge windows
>> > to fit in upstream windows") broke booting on sparc/T5-8.
>> >
>> > In the boot log, there is
>> >   pci 0000:06:00.0: reg 0x184: can't handle BAR above 4GB (bus address
>> >   0x110204000)
>> > but that only could happen when dma_addr_t is 32-bit.
>> >
>> > According to David Miller, all DMA occurs behind an IOMMU and these
>> > IOMMUs only support 32-bit addressing, therefore dma_addr_t is
>> > 32-bit on sparc64.
>> >
>> > Let's introduce pci_bus_addr_t instead of using dma_addr_t,
>> > and pci_bus_addr_t will be 64-bit on 64-bit platform or X86_PAE.
>> >
>> > Fixes: commit d63e2e1f3df9 ("sparc/PCI: Clip bridge windows to fit in upstream windows")
>> > Fixes: commit 23b13bc76f35 ("PCI: Fail safely if we can't handle BARs larger than 4GB")
>> > Link: http://lkml.kernel.org/r/CAE9FiQU1gJY1LYrxs+ma5LCTEEe4xmtjRG0aXJ9K_Tsu+m9Wuw@mail.gmail.com
>> > Reported-by: David Ahern <david.ahern@...cle.com>
>> > Tested-by: David Ahern <david.ahern@...cle.com>
>> > Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>> > Cc: <stable@...r.kernel.org> #3.19
>> > ---
>> >  drivers/pci/Kconfig |  4 ++++
>> >  drivers/pci/bus.c   | 10 +++++-----
>> >  drivers/pci/probe.c | 12 ++++++------
>> >  include/linux/pci.h | 12 +++++++++---
>> >  4 files changed, 24 insertions(+), 14 deletions(-)
>> >
>> > diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
>> > index 7a8f1c5..6a5a269 100644
>> > --- a/drivers/pci/Kconfig
>> > +++ b/drivers/pci/Kconfig
>> > @@ -1,6 +1,10 @@
>> >  #
>> >  # PCI configuration
>> >  #
>> > +config PCI_BUS_ADDR_T_64BIT
>> > +   def_bool y if (64BIT || X86_PAE)
>> > +   depends on PCI
>>
>> We're going to use pci_bus_addr_t in some places where we previously used
>> dma_addr_t, which means pci_bus_addr_t should be at least as large as
>> dma_addr_t.  Can you enforce that directly, e.g., with something like this?
>>
>>     def_bool y if (ARCH_DMA_ADDR_T_64BIT || 64BIT || X86_PAE)

then should use

def_bool y if (ARCH_DMA_ADDR_T_64BIT || 64BIT)

Thanks

Yinghai
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