Documentation/ABI/testing/debugfs-tpmi
Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/debugfs-tpmi
File Facts
- System
- Linux kernel
- Corpus path
Documentation/ABI/testing/debugfs-tpmi- Extension
[no extension]- Size
- 1479 bytes
- Lines
- 41
- Domain
- Support Tooling And Documentation
- Bucket
- Documentation
- Inferred role
- Support Tooling And Documentation: Documentation
- Status
- atlas-only
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
What: /sys/kernel/debug/tpmi-<n>/pfs_dump
Date: November 2023
KernelVersion: 6.6
Contact: srinivas.pandruvada@linux.intel.com
Description:
The PFS (PM Feature Structure) table, shows details of each power
management feature. This includes:
tpmi_id, number of entries, entry size, offset, vsec offset, lock status
and disabled status.
Users: Debugging, any user space test suite
What: /sys/kernel/debug/tpmi-<n>/tpmi-id-<n>/mem_dump
Date: November 2023
KernelVersion: 6.6
Contact: srinivas.pandruvada@linux.intel.com
Description:
Shows the memory dump of the MMIO region for a TPMI ID.
Users: Debugging, any user space test suite
What: /sys/kernel/debug/tpmi-<n>/tpmi-id-<n>/mem_write
Date: November 2023
KernelVersion: 6.6
Contact: srinivas.pandruvada@linux.intel.com
Description:
Allows to write at any offset. It doesn't check for Read/Write access
as hardware will not allow to write at read-only memory. This write is
at offset multiples of 4. The format is instance,offset,contents.
Example:
echo 0,0x20,0xff > mem_write
echo 1,64,64 > mem_write
Users: Debugging, any user space test suite
What: /sys/kernel/debug/tpmi-<n>/plr/domain<n>/status
Date: Aug 2024
KernelVersion: 6.11
Contact: Tero Kristo <tero.kristo@linux.intel.com>
Description:
Shows the currently active Performance Limit Reasons for die level and the
individual CPUs under the die. The contents of this file are sticky, and
clearing all the statuses can be done by writing "0\n" to this file.Annotation
- Atlas domain: Support Tooling And Documentation / Documentation.
- Implementation status: atlas-only.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.