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Tero Kristo
0da7a95448
Describe the new 'plr' (Performance Limit Reasons) directory contents under the main TPMI debugfs folder. Reviewed-by: Andy Shevchenko <[email protected]> Reviewed-by: Ilpo Järvinen <[email protected]> Signed-off-by: Tero Kristo <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Ilpo Järvinen <[email protected]>
41 lines
1.4 KiB
Plaintext
41 lines
1.4 KiB
Plaintext
What: /sys/kernel/debug/tpmi-<n>/pfs_dump
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Date: November 2023
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KernelVersion: 6.6
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Contact: [email protected]
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Description:
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The PFS (PM Feature Structure) table, shows details of each power
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management feature. This includes:
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tpmi_id, number of entries, entry size, offset, vsec offset, lock status
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and disabled status.
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Users: Debugging, any user space test suite
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What: /sys/kernel/debug/tpmi-<n>/tpmi-id-<n>/mem_dump
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Date: November 2023
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KernelVersion: 6.6
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Contact: [email protected]
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Description:
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Shows the memory dump of the MMIO region for a TPMI ID.
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Users: Debugging, any user space test suite
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What: /sys/kernel/debug/tpmi-<n>/tpmi-id-<n>/mem_write
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Date: November 2023
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KernelVersion: 6.6
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Contact: [email protected]
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Description:
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Allows to write at any offset. It doesn't check for Read/Write access
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as hardware will not allow to write at read-only memory. This write is
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at offset multiples of 4. The format is instance,offset,contents.
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Example:
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echo 0,0x20,0xff > mem_write
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echo 1,64,64 > mem_write
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Users: Debugging, any user space test suite
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What: /sys/kernel/debug/tpmi-<n>/plr/domain<n>/status
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Date: Aug 2024
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KernelVersion: 6.11
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Contact: Tero Kristo <[email protected]>
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Description:
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Shows the currently active Performance Limit Reasons for die level and the
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individual CPUs under the die. The contents of this file are sticky, and
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clearing all the statuses can be done by writing "0\n" to this file.
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