1 What: /sys/kernel/debug/cxl/memX/inj 1 What: /sys/kernel/debug/cxl/memX/inject_poison
2 Date: April, 2023 2 Date: April, 2023
3 KernelVersion: v6.4 3 KernelVersion: v6.4
4 Contact: linux-cxl@vger.kernel.org 4 Contact: linux-cxl@vger.kernel.org
5 Description: 5 Description:
6 (WO) When a Device Physical Ad 6 (WO) When a Device Physical Address (DPA) is written to this
7 attribute, the memdev driver s 7 attribute, the memdev driver sends an inject poison command to
8 the device for the specified a 8 the device for the specified address. The DPA must be 64-byte
9 aligned and the length of the 9 aligned and the length of the injected poison is 64-bytes. If
10 successful, the device returns 10 successful, the device returns poison when the address is
11 accessed through the CXL.mem b 11 accessed through the CXL.mem bus. Injecting poison adds the
12 address to the device's Poison 12 address to the device's Poison List and the error source is set
13 to Injected. In addition, the 13 to Injected. In addition, the device adds a poison creation
14 event to its internal Informat 14 event to its internal Informational Event log, updates the
15 Event Status register, and if 15 Event Status register, and if configured, interrupts the host.
16 It is not an error to inject p 16 It is not an error to inject poison into an address that
17 already has poison present and !! 17 already has poison present and no error is returned. The
18 device returns 'Inject Poison !! 18 inject_poison attribute is only visible for devices supporting
19 is returned to the user. The i !! 19 the capability.
20 visible for devices supporting <<
21 20
22 21
23 What: /sys/kernel/debug/memX/clear_p 22 What: /sys/kernel/debug/memX/clear_poison
24 Date: April, 2023 23 Date: April, 2023
25 KernelVersion: v6.4 24 KernelVersion: v6.4
26 Contact: linux-cxl@vger.kernel.org 25 Contact: linux-cxl@vger.kernel.org
27 Description: 26 Description:
28 (WO) When a Device Physical Ad 27 (WO) When a Device Physical Address (DPA) is written to this
29 attribute, the memdev driver s 28 attribute, the memdev driver sends a clear poison command to
30 the device for the specified a 29 the device for the specified address. Clearing poison removes
31 the address from the device's 30 the address from the device's Poison List and writes 0 (zero)
32 for 64 bytes starting at addre 31 for 64 bytes starting at address. It is not an error to clear
33 poison from an address that do 32 poison from an address that does not have poison set. If the
34 device cannot clear poison fro 33 device cannot clear poison from the address, -ENXIO is returned.
35 The clear_poison attribute is 34 The clear_poison attribute is only visible for devices
36 supporting the capability. 35 supporting the capability.
37 <<
38 What: /sys/kernel/debug/cxl/einj_typ <<
39 Date: January, 2024 <<
40 KernelVersion: v6.9 <<
41 Contact: linux-cxl@vger.kernel.org <<
42 Description: <<
43 (RO) Prints the CXL protocol e <<
44 the platform in the format: <<
45 <<
46 0x<error number> <erro <<
47 <<
48 The possible error types are ( <<
49 <<
50 0x1000 CXL.cache Prot <<
51 0x2000 CXL.cache Prot <<
52 0x4000 CXL.cache Prot <<
53 0x8000 CXL.mem Protoc <<
54 0x10000 CXL.mem Protoc <<
55 0x20000 CXL.mem Protoc <<
56 <<
57 The <error number> can be writ <<
58 <error type> into a chosen dpo <<
59 <<
60 What: /sys/kernel/debug/cxl/$dport_d <<
61 Date: January, 2024 <<
62 KernelVersion: v6.9 <<
63 Contact: linux-cxl@vger.kernel.org <<
64 Description: <<
65 (WO) Writing an integer to thi <<
66 CXL protocol error into $dport <<
67 name from /sys/bus/pci/devices <<
68 injection can be found by read <<
69 was enumerated in RCH mode, a <<
70 a CXL 2.0 error is injected. <<
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