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

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Date:	Thu, 22 Oct 2015 17:14:55 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Toshi Kani <toshi.kani@....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, 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?
--
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