linux-kernel - [tip:core/resources] ACPI/EINJ: Allow memory error injection to NVDIMM

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Date:	Sat, 30 Jan 2016 01:33:54 -0800
From:	tip-bot for Toshi Kani <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	lenb@...nel.org, linux-kernel@...r.kernel.org, luto@...capital.net,
	rjw@...ysocki.net, dan.j.williams@...el.com,
	jarkko.nikula@...ux.intel.com, dvlasenk@...hat.com,
	peterz@...radead.org, tglx@...utronix.de, mingo@...nel.org,
	bp@...en8.de, linux-mm@...ck.org, mcgrof@...e.com,
	toshi.kani@....com, vishal.l.verma@...el.com, bp@...e.de,
	akpm@...ux-foundation.org, brgerst@...il.com, tony.luck@...el.com,
	hpa@...or.com, toshi.kani@...com, torvalds@...ux-foundation.org
Subject: [tip:core/resources] ACPI/EINJ:
  Allow memory error injection to NVDIMM

Commit-ID:  4650bac1fc45d64aef62ab99aa4db93d41dedbd9
Gitweb:     http://git.kernel.org/tip/4650bac1fc45d64aef62ab99aa4db93d41dedbd9
Author:     Toshi Kani <toshi.kani@....com>
AuthorDate: Tue, 26 Jan 2016 21:57:33 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 30 Jan 2016 09:50:00 +0100

ACPI/EINJ: Allow memory error injection to NVDIMM

In the case of memory error injection, einj_error_inject()
checks if a target address is System RAM. Change this check to
allow injecting a memory error into NVDIMM memory by calling
region_intersects() with IORES_DESC_PERSISTENT_MEMORY. This
enables memory error testing on both System RAM and NVDIMM.

In addition, page_is_ram() is replaced with region_intersects()
with IORESOURCE_SYSTEM_RAM, so that it can verify a target
address range with the requested size.

Signed-off-by: Toshi Kani <toshi.kani@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Acked-by: Tony Luck <tony.luck@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Cc: Len Brown <lenb@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@...e.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Toshi Kani <toshi.kani@...com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: linux-acpi@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Cc: linux-mm <linux-mm@...ck.org>
Cc: linux-nvdimm@...ts.01.org
Link: http://lkml.kernel.org/r/1453841853-11383-18-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/acpi/apei/einj.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 0431883..559c117 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 +545,17 @@ 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 (((param2 & PAGE_MASK) != PAGE_MASK) ||
+	    ((region_intersects(base_addr, size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE)
+				!= REGION_INTERSECTS) &&
+	     (region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY)
+				!= REGION_INTERSECTS)))
 		return -EINVAL;
 
 inject: