linux-kernel - Re: [PATCH 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

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Date:	Fri, 23 Oct 2015 08:03:57 -0600
From:	Toshi Kani <toshi.kani@....com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux MM <linux-mm@...ck.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ACPI/APEI/EINJ: Allow memory error injection to
 NVDIMM

On Thu, 2015-10-22 at 17:14 -0700, Dan Williams wrote:
> On Thu, Oct 22, 2015 at 4:20 PM, Toshi Kani <toshi.kani@....com> wrote:
> > In the case of memory error injection, einj_error_inject() checks
> > if a target address is regular RAM.  Change this check to allow
> > injecting a memory error to both RAM and NVDIMM so that memory
> > errors can be tested on NVDIMM as well.
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@....com>
> > ---
> >  drivers/acpi/apei/einj.c |   12 ++++++++----
> >  1 file changed, 8 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
> > index 0431883..696f45a 100644
> > --- a/drivers/acpi/apei/einj.c
> > +++ b/drivers/acpi/apei/einj.c
> > @@ -519,7 +519,7 @@ static int
> (u32 type, u32 flags, u64 param1, u64 param2,
> >                              u64 param3, u64 param4)
> >  {
> >         int rc;
> > -       unsigned long pfn;
> > +       u64 base_addr, size;
> > 
> >         /* If user manually set "flags", make sure it is legal */
> >         if (flags && (flags &
> > @@ -545,10 +545,14 @@ static int einj_error_inject(u32 type, u32 flags, u64
> > param1, u64 param2,
> >         /*
> >          * Disallow crazy address masks that give BIOS leeway to pick
> >          * injection address almost anywhere. Insist on page or
> > -        * better granularity and that target address is normal RAM.
> > +        * better granularity and that target address is normal RAM or
> > +        * NVDIMM.
> >          */
> > -       pfn = PFN_DOWN(param1 & param2);
> > -       if (!page_is_ram(pfn) || ((param2 & PAGE_MASK) != PAGE_MASK))
> > +       base_addr = param1 & param2;
> > +       size = (~param2) + 1;
> > +       if (((!page_is_ram(PFN_DOWN(base_addr))) &&
> > +            (region_intersects_pmem(base_addr, size) != REGION_INTERSECTS))
> > ||
> > +           ((param2 & PAGE_MASK) != PAGE_MASK))
> 
> Hmm, should we also convert the page_is_ram() call to
> region_intersects_ram() so that we check the entire range from
> base_addr to base_addr + size?

Agreed.  I will update to use region_intersects_ram().

Thanks,
-Toshi
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