[PATCH v3 0/4] drm/xe/sysctrl: Add System Controller debugfs

From: Anoop Vijay <[email protected]>

This series adds debugfs-based test interfaces for the System
Controller (sysctrl) mailbox, to aid validation of firmware
communication and RAS error handling without requiring userspace
tooling.

Key features introduced:
- Debugfs infrastructure for sysctrl (types, registration hook)
- Loopback test entry exercising the mailbox send/receive path via
  the Core group's inverted loopback command (0xFF/0x03)
- RAS error injection entry exercising the Diag group's
  RAS_ERR_INJECT command (0x02/0x7E), gated on the diag application
  having completed firmware boot/init

v3:
- Fix RAS error injection command ID to 0x7E
- Add xe_pm_runtime guard for mailbox commands
- Rename error injection command to avoid fwctl command ID collision
- Reject writes until the diag firmware is ready

Anoop Vijay (4):
  drm/xe/sysctrl: Add System Controller get application status
  drm/xe/sysctrl: Add sysctrl debugfs infrastructure
  drm/xe/sysctrl: Add loopback test debugfs interface
  drm/xe/sysctrl: Add RAS error injection debugfs interface

 drivers/gpu/drm/xe/Makefile                   |   1 +
 drivers/gpu/drm/xe/xe_debugfs.c               |   5 +
 drivers/gpu/drm/xe/xe_sysctrl.c               |  82 +++++
 drivers/gpu/drm/xe/xe_sysctrl.h               |   2 +
 drivers/gpu/drm/xe/xe_sysctrl_debugfs.c       | 280 ++++++++++++++++++
 drivers/gpu/drm/xe/xe_sysctrl_debugfs.h       |  14 +
 drivers/gpu/drm/xe/xe_sysctrl_mailbox_types.h |  98 ++++++
 drivers/gpu/drm/xe/xe_sysctrl_types.h         |  38 +++
 8 files changed, 520 insertions(+)
 create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_debugfs.c
 create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_debugfs.h

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2.43.0