ACPI/APEI: Update einj documentation for param1/param2
To ensure EINJ working well when injecting errors via EINJ
table, add some restrictions: param1 must be a valid physical
RAM address and param2 must specify page granularity or
narrower.
Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/Documentation/acpi/apei/einj.txt b/Documentation/acpi/apei/einj.txt
index e20b6da..a58b63d 100644
--- a/Documentation/acpi/apei/einj.txt
+++ b/Documentation/acpi/apei/einj.txt
@@ -47,11 +47,16 @@
- param1
This file is used to set the first error parameter value. Effect of
- parameter depends on error_type specified.
+ parameter depends on error_type specified. For example, if error
+ type is memory related type, the param1 should be a valid physical
+ memory address.
- param2
This file is used to set the second error parameter value. Effect of
- parameter depends on error_type specified.
+ parameter depends on error_type specified. For example, if error
+ type is memory related type, the param2 should be a physical memory
+ address mask. Linux requires page or narrower granularity, say,
+ 0xfffffffffffff000.
- notrigger
The EINJ mechanism is a two step process. First inject the error, then