kernel/linux.git/drivers/gpu/drm/xe/xe_gt_debugfs.c, branch linux-7.1.y

drm/xe/reg_sr: Allow register_save_restore_check debugfs to verify LRC values

2026-02-19T15:31:05+00:00

reg_sr programming that applies to an engines LRC cannot be verified by a simple CPU-based register readout because the reg_sr's values may not be in effect if no context is executing on the hardware at the time we check. Instead, we should verify correct reg_sr application by searching for the register in the default_lrc. Reviewed-by: Ashutosh Dixit Link: https://patch.msgid.link/20260218-sr_verify-v4-4-35d6deeb3421@intel.com Signed-off-by: Matt Roper

drm/xe/reg_sr: Add debugfs to verify status of reg_sr programming

2026-02-19T15:31:05+00:00

When applying save-restore register programming for workarounds, tuning settings, and general device configuration we assume the programming was successful. However there are a number of cases where the desired reg_sr programming can become lost: - workarounds implemented on the wrong RTP table might not get saved/restored at the right time leading to, for example, failure to re-apply the programming after engine resets - some hardware registers become "locked" and can no longer be updated after firmware or the driver finishes initializing them - sometimes the hardware teams just made a mistake when documenting the register and/or bits that needed to be programmed Add a debugfs entry that will read back the registers referenced on a GT's save-restore lists and print any cases where the desired programming is no longer in effect. Such cases might indicate the presence of a driver/firmware bug, might indicate that the documentation we were following has a mistake, or might be benign (occasionally registers have broken read-back capability preventing verification, but previous writes were still successful and effective). For now we only verify the GT and engine reg_sr lists. Verifying the LRC list will require checking the expected programming against the default_lrc contents, not the live registers (which may not reflect the reg_sr programming if no context is actively running). Reviewed-by: Ashutosh Dixit Link: https://patch.msgid.link/20260218-sr_verify-v4-2-35d6deeb3421@intel.com Signed-off-by: Matt Roper

drm/xe: Cleanup unused header includes

2026-01-15T15:05:04+00:00

clangd reports many "unused header" warnings throughout the Xe driver. Start working to clean this up by removing unnecessary includes in our .c files and/or replacing them with explicit includes of other headers that were previously being included indirectly. By far the most common offender here was unnecessary inclusion of xe_gt.h. That likely originates from the early days of xe.ko when xe_mmio did not exist and all register accesses, including those unrelated to GTs, were done with GT functions. There's still a lot of additional #include cleanup that can be done in the headers themselves; that will come as a followup series. v2: - Squash the 79-patch series down to a single patch. (MattB) Reviewed-by: Matthew Brost Link: https://patch.msgid.link/20260115032803.4067824-2-matthew.d.roper@intel.com Signed-off-by: Matt Roper

drm/xe: expose PAT software config to debugfs

2025-12-05T16:15:28+00:00

The existing "pat" debugfs node dumps the live PAT registers. Under SR-IOV the VF cannot touch those registers, so the file vanishes and users lose all PAT visibility. Add a VF-safe "pat_sw_config" entry to the VF-safe debugfs list. It prints the cached PAT table the driver programmed, rather than poking HW, so PF and VF instances present the same view. This lets IGT and other tools query the PAT configuration without carrying platform-specific tables or mirroring kernel logic. v2: (Jonathan) - Only append "(* = reserved entry)" to the PAT table header on Xe2+ platforms where it actually applies. - Deduplicate the PTA/ATS mode printing by introducing the small drm_printf_pat_mode() helper macro. v3: (Matt) - Print IDX[XE_CACHE_NONE_COMPRESSION] on every Xe2+ platform so the dump always reflects the value the driver might use (even if it defaults to 0) and future IP revisions don’t need extra condition tweaks. v4: - Drop the drm_printf_pat_mode macro and introduce a real helper xe2_pat_entry_dump(). (Jani) - Reuse the helper across all PTA/ATS/PAT dumps for xe2+ entries to keep output format identical. v5: (Matt) - Split the original patch into two: one for refactoring helpers, one for the new debugfs entry. CC: Jani Nikula Suggested-by: Matt Roper Signed-off-by: Xin Wang Reviewed-by: Jonathan Cavitt Signed-off-by: Matt Roper Link: https://patch.msgid.link/20251205070633.28072-1-x.wang@intel.com

drm/xe/gt_debugfs: Use scope-based cleanup

2025-11-19T19:58:58+00:00

Use scope-based cleanup for forcewake and runtime PM to simplify the debugfs code slightly. Reviewed-by: Gustavo Sousa Link: https://patch.msgid.link/20251118164338.3572146-45-matthew.d.roper@intel.com Signed-off-by: Matt Roper

drm/xe/debugfs: Update xe_pat_dump signature

2025-09-30T08:21:28+00:00

Our debugfs helper xe_gt_debugfs_show_with_rpm() expects print() functions to return int. New signature allows us to drop wrapper. While around, move kernel-doc closer to the function definition, as suggested in the doc-guide. Signed-off-by: Michal Wajdeczko Cc: Rodrigo Vivi Reviewed-by: Rodrigo Vivi Link: https://lore.kernel.org/r/20250923211613.193347-6-michal.wajdeczko@intel.com

drm/xe/debugfs: Update xe_mocs_dump signature

2025-09-30T08:21:27+00:00

drm/xe/debugfs: Update xe_tuning_dump signature

2025-09-30T08:21:26+00:00

Our debugfs helper xe_gt_debugfs_show_with_rpm() expects print() functions to return int. New signature allows us to drop wrapper. While around, print additional separation lines using puts() to avoid output with leading \n which might confuse some printers. Signed-off-by: Michal Wajdeczko Cc: Rodrigo Vivi Reviewed-by: Rodrigo Vivi Link: https://lore.kernel.org/r/20250923211613.193347-4-michal.wajdeczko@intel.com

drm/xe/debugfs: Update xe_wa_dump signature

2025-09-30T08:21:24+00:00

drm/xe/debugfs: Update xe_gt_topology_dump signature

2025-09-30T08:21:23+00:00

Our debugfs helper xe_gt_debugfs_show_with_rpm() expects print() functions to return int. New signature allows us to drop wrapper. Signed-off-by: Michal Wajdeczko Cc: Rodrigo Vivi Reviewed-by: Rodrigo Vivi Link: https://lore.kernel.org/r/20250923211613.193347-2-michal.wajdeczko@intel.com