[PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

[PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

[Toshi Kani]

In the case of memory error injection, einj_error_inject() checks
if a target address is regular RAM.  Update this check to add a call
to region_intersects_pmem() to verify if a target address range is
NVDIMM.  This allows injecting a memory error to both RAM and NVDIMM
for testing.

Also, the current RAM check, page_is_ram(), is replaced with
region_intersects_ram() so that it can verify a target address
range with the requested size.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
---
Add a blank line before if-statement. (Borislav Petkov)
---
 drivers/acpi/apei/einj.c |   13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 0431883..db21efe 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -519,7 +519,7 @@ static int einj_error_inject(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 +545,15 @@ 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 (((region_intersects_ram(base_addr, size) != REGION_INTERSECTS) &&
+	     (region_intersects_pmem(base_addr, size) != REGION_INTERSECTS)) ||
+	    ((param2 & PAGE_MASK) != PAGE_MASK))
 		return -EINVAL;
 
 inject:

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RE: [PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

[Luck, Tony]

-	pfn = PFN_DOWN(param1 & param2);
-	if (!page_is_ram(pfn) || ((param2 & PAGE_MASK) != PAGE_MASK))
+	base_addr = param1 & param2;
+	size = (~param2) + 1;

We expect the user will supply us with param2 in the form 0xffffffff[fec8]00000
with various numbers of leading 'f' and trailing '0' ... but I don't think we actually
check that anywhere.  But we have a bunch of places that assume it is OK, including
this new one.

It's time to fix that.  Maybe even provide a default 0xfffffffffffff000 so I can save myself
some typing?

-Tony

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Re: [PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

[Toshi Kani]

On Mon, 2015-10-26 at 16:26 +0000, Luck, Tony wrote:
> -	pfn = PFN_DOWN(param1 & param2);
> -	if (!page_is_ram(pfn) || ((param2 & PAGE_MASK) != PAGE_MASK))
> +	base_addr = param1 & param2;
> +	size = (~param2) + 1;
> 
> We expect the user will supply us with param2 in the form 0xffffffff[fec8]00000
> with various numbers of leading 'f' and trailing '0' ... but I don't think we actually
> check that anywhere.  But we have a bunch of places that assume it is OK, including
> this new one.
> 
> It's time to fix that.  Maybe even provide a default 0xfffffffffffff000 so I can save 
> myself some typing?

+       if (((region_intersects_ram(base_addr, size) != REGION_INTERSECTS) &&
+            (region_intersects_pmem(base_addr, size) != REGION_INTERSECTS)) ||
+           ((param2 & PAGE_MASK) != PAGE_MASK))
                return -EINVAL;

The 3rd condition check makes sure that the param2 mask is the page size or less.  So, I
think we are OK on this.

Thanks,
-Toshi

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RE: [PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

[Luck, Tony]

> +           ((param2 & PAGE_MASK) != PAGE_MASK))
>                return -EINVAL;
>
> The 3rd condition check makes sure that the param2 mask is the page size or less.  So, I
> think we are OK on this.

Oops. The original was even on the screen as part of the diff (which I signed off on just two years ago).

I'd be happier if you made it the 1st condition though, so we skip calling region_intersects_*() with
a nonsense "size" argument.

-Tony

Re: [PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

[Toshi Kani]

On Mon, 2015-10-26 at 16:46 +0000, Luck, Tony wrote:
> > +           ((param2 & PAGE_MASK) != PAGE_MASK))
> >                return -EINVAL;
> > 
> > The 3rd condition check makes sure that the param2 mask is the page size or less.  So, 
> > I think we are OK on this.
> 
> Oops. The original was even on the screen as part of the diff (which I signed off on
> just two years ago).
> 
> I'd be happier if you made it the 1st condition though, so we skip calling 
> region_intersects_*() with a nonsense "size" argument.

Agreed.  I will send an updated patch 3/3 later today, "[PATCH v2 UPDATE-2 3/3]".

Thanks,
-Toshi

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