On 21/03/2022 17:03, Greg Kroah-Hartman wrote:
On Mon, Mar 21, 2022 at 04:46:36PM +0700, Quan Nguyen wrote:
On 21/03/2022 15:23, Greg Kroah-Hartman wrote:
On Mon, Mar 21, 2022 at 03:13:55PM +0700, Quan Nguyen wrote:
Add documentation for the Ampere(R)'s Altra(R) SMpro sysfs interfaces
Signed-off-by: Quan Nguyen <quan@xxxxxxxxxxxxxxxxxxxxxx>
---
Changes in v7:
+ First introduce in v7 [Greg]
.../sysfs-bus-platform-devices-ampere-smpro | 133 ++++++++++++++++++
1 file changed, 133 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro
diff --git a/Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro b/Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro
new file mode 100644
index 000000000000..9bfd8d6d0f71
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro
@@ -0,0 +1,133 @@
+What: /sys/bus/platform/devices/smpro-errmon.*/errors_[core|mem|pcie|other]_[ce|ue]
Please split this out as one entry per file.
These sysfs share same format of HW errors (the 48-byte Arm vendor specific
HW error record) but for separate HW domains: Core, PCIe, Mem... etc
+KernelVersion: 5.14
5.14 is a long time ago.
+Contact: quan@xxxxxxxxxxxxxxxxxxxxxx
+Description:
+ (RO) Contains the 48-byte Ampere (Vendor-Specific) Error Record, see [1]
+ printed in hex format as below:
+
+ AA BB CCCC DDDDDDDD DDDDDDDDDDDDDDDD DDDDDDDDDDDDDDDD \
+ DDDDDDDDDDDDDDDD DDDDDDDDDDDDDDDD DDDDDDDDDDDDDDDD
+ Where:
+ AA : Error Type
+ BB : Subtype
+ CCCC : Instance
+ DDD...DDD: Similar to the Arm RAS standard error record
No, this is not a valid sysfs file, sorry. This should just be one
value per file.
This 48-byte value is unable to separate into smaller values because it
contain all information necessary to indicate a single HW error as per ARM
RAS supplement document [1]. The format is to make it read-able other than a
single 48-byte hex value.
[1] https://developer.arm.com/documentation/ddi0587/latest/
Just export the 48 byte hex value and make userspace split it up if it
wants to do so. Don't do things in the kernel that can be done in
userspace.
Thanks Greg for the suggestion,
Will do this in my next version.
Thanks,
- Quan
