* [PATCH v2 0/3] Allow EINJ to inject memory error to NVDIMM
@ 2015-10-23 18:53 Toshi Kani
2015-10-23 18:53 ` [PATCH v2 1/3] resource: Add @flags to region_intersects() Toshi Kani
` (3 more replies)
0 siblings, 4 replies; 8+ messages in thread
From: Toshi Kani @ 2015-10-23 18:53 UTC (permalink / raw)
To: akpm, dan.j.williams, rjw
Cc: linux-mm, linux-nvdimm, linux-acpi, linux-kernel
This patch-set extends the EINJ driver to allow injecting a memory
error to NVDIMM. It first extends iomem resource interface to support
checking a NVDIMM region.
Patch 1/3 changes region_intersects() to accept non-RAM regions, and
adds region_intersects_ram().
Patch 2/3 adds region_intersects_pmem() to check a NVDIMM region.
Patch 3/3 changes the EINJ driver to allow injecting a memory error
to NVDIMM.
---
v2:
- Change the EINJ driver to call region_intersects_ram() for checking
RAM with a specified size. (Dan Williams)
- Add export to region_intersects_ram().
---
Toshi Kani (3):
1/3 resource: Add @flags to region_intersects()
2/3 resource: Add region_intersects_pmem()
3/3 ACPI/APEI/EINJ: Allow memory error injection to NVDIMM
---
drivers/acpi/apei/einj.c | 12 ++++++++----
include/linux/mm.h | 5 ++++-
kernel/memremap.c | 5 ++---
kernel/resource.c | 35 ++++++++++++++++++++++++++++-------
4 files changed, 42 insertions(+), 15 deletions(-)
--
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^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH v2 1/3] resource: Add @flags to region_intersects()
2015-10-23 18:53 [PATCH v2 0/3] Allow EINJ to inject memory error to NVDIMM Toshi Kani
@ 2015-10-23 18:53 ` Toshi Kani
2015-10-23 18:53 ` [PATCH v2 2/3] resource: Add region_intersects_pmem() Toshi Kani
` (2 subsequent siblings)
3 siblings, 0 replies; 8+ messages in thread
From: Toshi Kani @ 2015-10-23 18:53 UTC (permalink / raw)
To: akpm, dan.j.williams, rjw
Cc: linux-mm, linux-nvdimm, linux-acpi, linux-kernel, Toshi Kani
region_intersects() checks if a specified region partially overlaps
or fully eclipses a resource identified by @name. It currently sets
resource flags statically, which prevents the caller from specifying
a non-RAM region, such as persistent memory. Add @flags so that
any region can be specified to the function.
A helper function, region_intersects_ram(), is added so that the
callers that check a RAM region do not have to specify its iomem
resource name and flags. This interface is exported for modules,
such as the EINJ driver.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
---
include/linux/mm.h | 4 +++-
kernel/memremap.c | 5 ++---
kernel/resource.c | 23 ++++++++++++++++-------
3 files changed, 21 insertions(+), 11 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 80001de..699224e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -358,7 +358,9 @@ enum {
REGION_MIXED,
};
-int region_intersects(resource_size_t offset, size_t size, const char *type);
+int region_intersects(resource_size_t offset, size_t size, const char *type,
+ unsigned long flags);
+int region_intersects_ram(resource_size_t offset, size_t size);
/* Support for virtually mapped pages */
struct page *vmalloc_to_page(const void *addr);
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 72b0c66..2157ea5 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -47,7 +47,7 @@ __weak void __iomem *ioremap_cache(resource_size_t offset, unsigned long size)
*/
void *memremap(resource_size_t offset, size_t size, unsigned long flags)
{
- int is_ram = region_intersects(offset, size, "System RAM");
+ int is_ram = region_intersects_ram(offset, size);
void *addr = NULL;
if (is_ram == REGION_MIXED) {
@@ -152,8 +152,7 @@ static void devm_memremap_pages_release(struct device *dev, void *res)
void *devm_memremap_pages(struct device *dev, struct resource *res)
{
- int is_ram = region_intersects(res->start, resource_size(res),
- "System RAM");
+ int is_ram = region_intersects_ram(res->start, resource_size(res));
struct page_map *page_map;
int error, nid;
diff --git a/kernel/resource.c b/kernel/resource.c
index f150dbb..15c133e 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -497,6 +497,7 @@ EXPORT_SYMBOL_GPL(page_is_ram);
* @start: region start address
* @size: size of region
* @name: name of resource (in iomem_resource)
+ * @flags: flags of resource (in iomem_resource)
*
* Check if the specified region partially overlaps or fully eclipses a
* resource identified by @name. Return REGION_DISJOINT if the region
@@ -504,15 +505,11 @@ EXPORT_SYMBOL_GPL(page_is_ram);
* @type and another resource, and return REGION_INTERSECTS if the
* region overlaps @type and no other defined resource. Note, that
* REGION_INTERSECTS is also returned in the case when the specified
- * region overlaps RAM and undefined memory holes.
- *
- * region_intersect() is used by memory remapping functions to ensure
- * the user is not remapping RAM and is a vast speed up over walking
- * through the resource table page by page.
+ * region overlaps with undefined memory holes.
*/
-int region_intersects(resource_size_t start, size_t size, const char *name)
+int region_intersects(resource_size_t start, size_t size, const char *name,
+ unsigned long flags)
{
- unsigned long flags = IORESOURCE_MEM | IORESOURCE_BUSY;
resource_size_t end = start + size - 1;
int type = 0; int other = 0;
struct resource *p;
@@ -539,6 +536,18 @@ int region_intersects(resource_size_t start, size_t size, const char *name)
return REGION_DISJOINT;
}
+/*
+ * region_intersect_ram() is used by memory remapping functions to ensure
+ * the user is not remapping RAM and is a vast speed up over walking
+ * through the resource table page by page.
+ */
+int region_intersects_ram(resource_size_t start, size_t size)
+{
+ return region_intersects(start, size, "System RAM",
+ IORESOURCE_MEM | IORESOURCE_BUSY);
+}
+EXPORT_SYMBOL_GPL(region_intersects_ram);
+
void __weak arch_remove_reservations(struct resource *avail)
{
}
--
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^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH v2 2/3] resource: Add region_intersects_pmem()
2015-10-23 18:53 [PATCH v2 0/3] Allow EINJ to inject memory error to NVDIMM Toshi Kani
2015-10-23 18:53 ` [PATCH v2 1/3] resource: Add @flags to region_intersects() Toshi Kani
@ 2015-10-23 18:53 ` Toshi Kani
2015-10-23 18:53 ` [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM Toshi Kani
2015-10-23 19:05 ` [PATCH v2 0/3] Allow EINJ to inject memory error " Dan Williams
3 siblings, 0 replies; 8+ messages in thread
From: Toshi Kani @ 2015-10-23 18:53 UTC (permalink / raw)
To: akpm, dan.j.williams, rjw
Cc: linux-mm, linux-nvdimm, linux-acpi, linux-kernel, Toshi Kani
Add region_intersects_pmem(), which checks if a specified address
range is persistent memory registered as "Persistent Memory" in
the iomem_resource list.
Note, it does not support legacy persistent memory registered as
"Persistent Memory (legacy)". It can be supported by extending
this function or a separate function, if necessary.
This interface is exported so that it can be called from modules,
such as the EINJ driver.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
---
include/linux/mm.h | 1 +
kernel/resource.c | 12 ++++++++++++
2 files changed, 13 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 699224e..ae1790f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -361,6 +361,7 @@ enum {
int region_intersects(resource_size_t offset, size_t size, const char *type,
unsigned long flags);
int region_intersects_ram(resource_size_t offset, size_t size);
+int region_intersects_pmem(resource_size_t offset, size_t size);
/* Support for virtually mapped pages */
struct page *vmalloc_to_page(const void *addr);
diff --git a/kernel/resource.c b/kernel/resource.c
index 15c133e..5230e63 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -548,6 +548,18 @@ int region_intersects_ram(resource_size_t start, size_t size)
}
EXPORT_SYMBOL_GPL(region_intersects_ram);
+/*
+ * region_intersects_pmem() checks if a specified address range is
+ * persistent memory, registered as "Persistent Memory", in the
+ * iomem_resource list.
+ */
+int region_intersects_pmem(resource_size_t start, size_t size)
+{
+ return region_intersects(start, size, "Persistent Memory",
+ IORESOURCE_MEM);
+}
+EXPORT_SYMBOL_GPL(region_intersects_pmem);
+
void __weak arch_remove_reservations(struct resource *avail)
{
}
--
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^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM
2015-10-23 18:53 [PATCH v2 0/3] Allow EINJ to inject memory error to NVDIMM Toshi Kani
2015-10-23 18:53 ` [PATCH v2 1/3] resource: Add @flags to region_intersects() Toshi Kani
2015-10-23 18:53 ` [PATCH v2 2/3] resource: Add region_intersects_pmem() Toshi Kani
@ 2015-10-23 18:53 ` Toshi Kani
2015-10-24 15:24 ` Rafael J. Wysocki
2015-10-25 10:45 ` Borislav Petkov
2015-10-23 19:05 ` [PATCH v2 0/3] Allow EINJ to inject memory error " Dan Williams
3 siblings, 2 replies; 8+ messages in thread
From: Toshi Kani @ 2015-10-23 18:53 UTC (permalink / raw)
To: akpm, dan.j.williams, rjw
Cc: linux-mm, linux-nvdimm, linux-acpi, linux-kernel, 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>
---
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..ab55bbe 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 +545,14 @@ 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 (((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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^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v2 0/3] Allow EINJ to inject memory error to NVDIMM
2015-10-23 18:53 [PATCH v2 0/3] Allow EINJ to inject memory error to NVDIMM Toshi Kani
` (2 preceding siblings ...)
2015-10-23 18:53 ` [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM Toshi Kani
@ 2015-10-23 19:05 ` Dan Williams
3 siblings, 0 replies; 8+ messages in thread
From: Dan Williams @ 2015-10-23 19:05 UTC (permalink / raw)
To: Toshi Kani
Cc: Andrew Morton, Rafael J. Wysocki, Linux MM, linux-nvdimm,
Linux ACPI, linux-kernel
On Fri, Oct 23, 2015 at 11:53 AM, Toshi Kani <toshi.kani@hpe.com> wrote:
> This patch-set extends the EINJ driver to allow injecting a memory
> error to NVDIMM. It first extends iomem resource interface to support
> checking a NVDIMM region.
>
> Patch 1/3 changes region_intersects() to accept non-RAM regions, and
> adds region_intersects_ram().
>
> Patch 2/3 adds region_intersects_pmem() to check a NVDIMM region.
>
> Patch 3/3 changes the EINJ driver to allow injecting a memory error
> to NVDIMM.
>
> ---
> v2:
> - Change the EINJ driver to call region_intersects_ram() for checking
> RAM with a specified size. (Dan Williams)
> - Add export to region_intersects_ram().
>
> ---
For the series:
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM
2015-10-23 18:53 ` [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM Toshi Kani
@ 2015-10-24 15:24 ` Rafael J. Wysocki
2015-10-25 10:45 ` Borislav Petkov
1 sibling, 0 replies; 8+ messages in thread
From: Rafael J. Wysocki @ 2015-10-24 15:24 UTC (permalink / raw)
To: Toshi Kani
Cc: akpm, dan.j.williams, linux-mm, linux-nvdimm, linux-acpi,
linux-kernel, Tony Luck, Borislav Petkov
On Friday, October 23, 2015 12:53:59 PM Toshi Kani wrote:
> 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>
This is fine by me, but adding RAS maintainers Tony and Boris.
Thanks,
Rafael
> ---
> 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..ab55bbe 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 +545,14 @@ 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 (((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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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM
2015-10-23 18:53 ` [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM Toshi Kani
2015-10-24 15:24 ` Rafael J. Wysocki
@ 2015-10-25 10:45 ` Borislav Petkov
2015-10-26 14:52 ` Toshi Kani
1 sibling, 1 reply; 8+ messages in thread
From: Borislav Petkov @ 2015-10-25 10:45 UTC (permalink / raw)
To: Toshi Kani
Cc: akpm, dan.j.williams, rjw, linux-mm, linux-nvdimm, linux-acpi,
linux-kernel
On Fri, Oct 23, 2015 at 12:53:59PM -0600, Toshi Kani wrote:
> 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>
> ---
> drivers/acpi/apei/einj.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
...
> @@ -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;
Just a minor nitpick: please separate assignments from the if-statement
here with a \n.
> + 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:
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
--
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM
2015-10-25 10:45 ` Borislav Petkov
@ 2015-10-26 14:52 ` Toshi Kani
0 siblings, 0 replies; 8+ messages in thread
From: Toshi Kani @ 2015-10-26 14:52 UTC (permalink / raw)
To: Borislav Petkov
Cc: akpm, dan.j.williams, rjw, linux-mm, linux-nvdimm, linux-acpi,
linux-kernel
On Sun, 2015-10-25 at 11:45 +0100, Borislav Petkov wrote:
> On Fri, Oct 23, 2015 at 12:53:59PM -0600, Toshi Kani wrote:
> > 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>
> > ---
> > drivers/acpi/apei/einj.c | 12 ++++++++----
> > 1 file changed, 8 insertions(+), 4 deletions(-)
>
> ...
>
> > @@ -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;
>
> Just a minor nitpick: please separate assignments from the if-statement
> here with a \n.
Sure. I will send an updated patch for 3/3, "[PATCH v2 UPDATE 3/3]".
Thanks,
-Toshi
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^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2015-10-26 14:56 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
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2015-10-23 18:53 [PATCH v2 0/3] Allow EINJ to inject memory error to NVDIMM Toshi Kani
2015-10-23 18:53 ` [PATCH v2 1/3] resource: Add @flags to region_intersects() Toshi Kani
2015-10-23 18:53 ` [PATCH v2 2/3] resource: Add region_intersects_pmem() Toshi Kani
2015-10-23 18:53 ` [PATCH v2 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM Toshi Kani
2015-10-24 15:24 ` Rafael J. Wysocki
2015-10-25 10:45 ` Borislav Petkov
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