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Re: Problem with atomic accesses in pstore on some ARM CPUs

From Will Deacon <will.deacon@arm.com>
Newsgroups linux.kernel
Subject Re: Problem with atomic accesses in pstore on some ARM CPUs
Date 2016-08-16 15:30 +0200
Message-ID <s6MBj-3Dm-5@gated-at.bofh.it> (permalink)
References <s6zkJ-3DX-1@gated-at.bofh.it> <s6JWN-1Uo-7@gated-at.bofh.it> <s6MrE-3zL-31@gated-at.bofh.it>
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On Tue, Aug 16, 2016 at 06:14:53AM -0700, Guenter Roeck wrote:
> On Tue, Aug 16, 2016 at 3:32 AM, Robin Murphy <robin.murphy@arm.com> wrote:
> > On 16/08/16 00:19, Guenter Roeck wrote:
> >> we are having a problem with atomic accesses in pstore on some ARM
> >> CPUs (specifically rk3288 and rk3399). With those chips, atomic
> >> accesses fail with both pgprot_noncached and pgprot_writecombine
> >> memory. Atomic accesses do work when selecting PAGE_KERNEL protection.
> >
> > What's the pstore backed by? I'm guessing it's not normal DRAM.
> >
> 
> it is normal DRAM.

In which case, why does it need to be mapped with weird attributes?
Is there an alias in the linear map you can use?

Will

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Thread

Problem with atomic accesses in pstore on some ARM CPUs Guenter Roeck <groeck@google.com> - 2016-08-16 01:20 +0200
  Re: Problem with atomic accesses in pstore on some ARM CPUs Robin Murphy <robin.murphy@arm.com> - 2016-08-16 12:40 +0200
    Re: Problem with atomic accesses in pstore on some ARM CPUs Will Deacon <will.deacon@arm.com> - 2016-08-16 12:50 +0200
      Re: Problem with atomic accesses in pstore on some ARM CPUs Guenter Roeck <groeck@google.com> - 2016-08-16 15:30 +0200
    Re: Problem with atomic accesses in pstore on some ARM CPUs Guenter Roeck <groeck@google.com> - 2016-08-16 15:20 +0200
      Re: Problem with atomic accesses in pstore on some ARM CPUs Will Deacon <will.deacon@arm.com> - 2016-08-16 15:30 +0200
        Re: Problem with atomic accesses in pstore on some ARM CPUs Guenter Roeck <groeck@google.com> - 2016-08-16 17:20 +0200
          Re: Problem with atomic accesses in pstore on some ARM CPUs Mark Rutland <mark.rutland@arm.com> - 2016-08-16 19:30 +0200
            Re: Problem with atomic accesses in pstore on some ARM CPUs Colin Cross <ccross@android.com> - 2016-08-16 19:50 +0200
              Re: Problem with atomic accesses in pstore on some ARM CPUs Guenter Roeck <groeck@google.com> - 2016-08-16 22:30 +0200
                Re: Problem with atomic accesses in pstore on some ARM CPUs Kees Cook <keescook@chromium.org> - 2016-08-16 23:00 +0200
                Re: Problem with atomic accesses in pstore on some ARM CPUs Guenter Roeck <groeck@google.com> - 2016-08-17 02:30 +0200
              Re: Problem with atomic accesses in pstore on some ARM CPUs Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-08-19 11:40 +0200
                Re: Problem with atomic accesses in pstore on some ARM CPUs Guenter Roeck <groeck@google.com> - 2016-08-19 14:50 +0200
            Re: Problem with atomic accesses in pstore on some ARM CPUs Arnd Bergmann <arnd@arndb.de> - 2016-08-22 23:10 +0200

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