drm/xe: Add debugfs for IA/GT bias

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GT_IA_PERF_BIAS_REG indicates power budget between IA and GT.
Lower 16 bits correspond to IA and upper to GT. Higher value
indicates more bias towards that plane. The values are in U1.15
format.

$ cat /sys/kernel/debug/dri/0/gt0/gt_ia_bias
0x80004000 (GT: 1.0000, IA: 0.5000)

This interface will allow us to observe power budget changes while
running workloads and also, if needed, tune it. Minimum allowed value
for each of GT/IA bias is 0x10, and max is 0x8000 which corresponds
to a bias ratio of 1.

Bspec: 51878

v3: Add a helper function for U1.15 decode (Michal)
v4: Validate input values (Rodrigo)
v5: Comments (Michal, Rodrigo)
v6: Rename to gt_ia_bias (Anirban), check lower bound (Michal)
v7: Update filename in commit message

Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sk Anirban <sk.anirban@intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Assisted-by: Copilot:auto
Reviewed-by: Sk Anirban <sk.anirban@intel.com>
Link: https://patch.msgid.link/20260729221629.593195-3-vinay.belgaumkar@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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Vinay Belgaumkar 2026-07-29 15:16:29 -07:00 • committed by Rodrigo Vivi

parent 5c45e2dbe6

commit 41fe15d1a4

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6

drivers/gpu/drm/xe/regs/xe_gt_regs.h

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80

drivers/gpu/drm/xe/xe_gt_debugfs.c

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