| Huang Ying | ea8c071 | 2010-05-18 14:35:15 +0800 | [diff] [blame] | 1 | APEI Error INJection |
| 2 | ~~~~~~~~~~~~~~~~~~~~ |
| 3 | |
| 4 | EINJ provides a hardware error injection mechanism |
| 5 | It is very useful for debugging and testing of other APEI and RAS features. |
| 6 | |
| 7 | To use EINJ, make sure the following are enabled in your kernel |
| 8 | configuration: |
| 9 | |
| 10 | CONFIG_DEBUG_FS |
| 11 | CONFIG_ACPI_APEI |
| 12 | CONFIG_ACPI_APEI_EINJ |
| 13 | |
| 14 | The user interface of EINJ is debug file system, under the |
| 15 | directory apei/einj. The following files are provided. |
| 16 | |
| 17 | - available_error_type |
| 18 | Reading this file returns the error injection capability of the |
| 19 | platform, that is, which error types are supported. The error type |
| 20 | definition is as follow, the left field is the error type value, the |
| 21 | right field is error description. |
| 22 | |
| 23 | 0x00000001 Processor Correctable |
| 24 | 0x00000002 Processor Uncorrectable non-fatal |
| 25 | 0x00000004 Processor Uncorrectable fatal |
| 26 | 0x00000008 Memory Correctable |
| 27 | 0x00000010 Memory Uncorrectable non-fatal |
| 28 | 0x00000020 Memory Uncorrectable fatal |
| 29 | 0x00000040 PCI Express Correctable |
| 30 | 0x00000080 PCI Express Uncorrectable fatal |
| 31 | 0x00000100 PCI Express Uncorrectable non-fatal |
| 32 | 0x00000200 Platform Correctable |
| 33 | 0x00000400 Platform Uncorrectable non-fatal |
| 34 | 0x00000800 Platform Uncorrectable fatal |
| 35 | |
| 36 | The format of file contents are as above, except there are only the |
| 37 | available error type lines. |
| 38 | |
| 39 | - error_type |
| 40 | This file is used to set the error type value. The error type value |
| 41 | is defined in "available_error_type" description. |
| 42 | |
| 43 | - error_inject |
| 44 | Write any integer to this file to trigger the error |
| 45 | injection. Before this, please specify all necessary error |
| 46 | parameters. |
| 47 | |
| Huang Ying | 6e320ec | 2010-05-18 14:35:24 +0800 | [diff] [blame] | 48 | - param1 |
| 49 | This file is used to set the first error parameter value. Effect of |
| 50 | parameter depends on error_type specified. For memory error, this is |
| Huang Ying | c3e6088 | 2011-07-20 16:09:29 +0800 | [diff] [blame] | 51 | physical memory address. Only available if param_extension module |
| 52 | parameter is specified. |
| Huang Ying | 6e320ec | 2010-05-18 14:35:24 +0800 | [diff] [blame] | 53 | |
| 54 | - param2 |
| 55 | This file is used to set the second error parameter value. Effect of |
| 56 | parameter depends on error_type specified. For memory error, this is |
| Huang Ying | c3e6088 | 2011-07-20 16:09:29 +0800 | [diff] [blame] | 57 | physical memory address mask. Only available if param_extension |
| 58 | module parameter is specified. |
| 59 | |
| 60 | Injecting parameter support is a BIOS version specific extension, that |
| 61 | is, it only works on some BIOS version. If you want to use it, please |
| 62 | make sure your BIOS version has the proper support and specify |
| 63 | "param_extension=y" in module parameter. |
| Huang Ying | 6e320ec | 2010-05-18 14:35:24 +0800 | [diff] [blame] | 64 | |
| Huang Ying | ea8c071 | 2010-05-18 14:35:15 +0800 | [diff] [blame] | 65 | For more information about EINJ, please refer to ACPI specification |
| 66 | version 4.0, section 17.5. |