Commit | Line | Data |
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50d527f5 AS |
1 | What: /sys/kernel/debug/cxl/memX/inject_poison |
2 | Date: April, 2023 | |
3 | KernelVersion: v6.4 | |
4 | Contact: linux-cxl@vger.kernel.org | |
5 | Description: | |
6 | (WO) When a Device Physical Address (DPA) is written to this | |
7 | attribute, the memdev driver sends an inject poison command to | |
8 | the device for the specified address. The DPA must be 64-byte | |
9 | aligned and the length of the injected poison is 64-bytes. If | |
10 | successful, the device returns poison when the address is | |
11 | accessed through the CXL.mem bus. Injecting poison adds the | |
12 | address to the device's Poison List and the error source is set | |
13 | to Injected. In addition, the device adds a poison creation | |
14 | event to its internal Informational Event log, updates the | |
15 | Event Status register, and if configured, interrupts the host. | |
16 | It is not an error to inject poison into an address that | |
17 | already has poison present and no error is returned. The | |
18 | inject_poison attribute is only visible for devices supporting | |
19 | the capability. | |
20 | ||
21 | ||
22 | What: /sys/kernel/debug/memX/clear_poison | |
23 | Date: April, 2023 | |
24 | KernelVersion: v6.4 | |
25 | Contact: linux-cxl@vger.kernel.org | |
26 | Description: | |
27 | (WO) When a Device Physical Address (DPA) is written to this | |
28 | attribute, the memdev driver sends a clear poison command to | |
29 | the device for the specified address. Clearing poison removes | |
30 | the address from the device's Poison List and writes 0 (zero) | |
31 | for 64 bytes starting at address. It is not an error to clear | |
32 | poison from an address that does not have poison set. If the | |
33 | device cannot clear poison from the address, -ENXIO is returned. | |
34 | The clear_poison attribute is only visible for devices | |
35 | supporting the capability. |