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Add a brief about what System controller is. Use either MKHI or SCHI. Not a mix of both Maybe add a link to the usage patch series. Thanks Riana > > Key features introduced: > - Detection and initialization of System Controller interface on Xe3p dGPU platforms > - Mailbox communication with System Controller firmware > - Fragmented message transfer for large command payloads > > This implementation establishes the base for future System Controller feature > enablement and firmware command handling. > --- > v2: (Umesh) > - Fix commit message to 75 chars per line > - Address CI.Hooks and checkpatch warnings > - Add sc_to_xe() helper for cleaner conversions > - Alphabetical order for headers > - Simplify write/read frame logic using memcpy > - Drop redundant frame length checks > - Use xe_mmio_rmw32() for register updates > - Align FIELD_PREP macros > - Improve error handling and timeout messages > - Handle phase_bit revert on write-frame failure > - Update rdata_len on partial receive before return > - Remove unnecessary headers > > v3: (Matt, Riana, Umesh) > - Split patch into logical series > - Rename SC_* macros to SYSCTRL_* for consistency > - Move MKHI_* defines to .c file > - Pass xe directly to helpers > - Place devm_add_action_or_reset() after set_sysctrl_region() > - Add kernel-doc for xe_sysctrl_mailbox_init() > - Add short documentation for System Controller in xe_sysctrl.c > - Avoid hardcoded sizes > - Move structs to _types.h > > v4: (Matt, Mike) > - Code style improvements > - Add domain-specific MMIO accessor > - Change phase_bit to bool type > - Add input validation and buffer overflow protection > > v5: (Umesh, Riana) > - Reset phase bit to 0 on error conditions > - Refactor mailbox receive path > - Updated xe_err messages for consistency > > v6: (Matt) > - Move protocol constants from xe_sysctrl_regs.h to xe_sysctrl_mailbox_types.h > - Add SYSCTRL_MB_CTRL_MKHI_CMD helper macro > > v7: > - Fix for CI failure > > v8: (Matt, Michal, Shuicheng) > - Reordered patches for logical flow > - Moved ABI definitions to dedicated header > - Static functions renamed with short prefix > - Fixed include order > - Added VF check > - Converted runtime checks to assertions > - Changed xe_sysctrl_send_command() function parameter from 'xe' to 'sc' > - Added frame length validation and command overflow protection > - Use REG_FIELD_PREP for hardware registers > - Changed error format to %pe > - Removed unnecessary NULL checks and explicit zeros > - Fixed kernel-doc syntax > - Added sc_to_xe() helper > > v9: (Matt, Umesh, Badal) > - Extended commit message to explain System Controller and purpose of > `has_sysctrl` flag > - Normalized hexadecimal literal casing > - Renamed MKHI to SCHI (System Controller Host Interface) > - Fixed kernel-doc syntax > --- > > Anoop Vijay (6): > drm/xe/sysctrl: Add System Controller types and device integration > drm/xe/sysctrl: Add System Controller register definitions > drm/xe/sysctrl: Add mailbox communication headers > drm/xe/sysctrl: Add System Controller initialization > drm/xe/sysctrl: Add mailbox communication implementation > drm/xe/pci: Enable System Controller for CRI platform > > drivers/gpu/drm/xe/Makefile | 2 + > drivers/gpu/drm/xe/abi/xe_sysctrl_abi.h | 31 ++ > drivers/gpu/drm/xe/regs/xe_sysctrl_regs.h | 36 ++ > drivers/gpu/drm/xe/xe_device.c | 5 + > drivers/gpu/drm/xe/xe_device_types.h | 6 + > drivers/gpu/drm/xe/xe_pci.c | 2 + > drivers/gpu/drm/xe/xe_pci_types.h | 1 + > drivers/gpu/drm/xe/xe_sysctrl.c | 84 ++++ > drivers/gpu/drm/xe/xe_sysctrl.h | 21 + > drivers/gpu/drm/xe/xe_sysctrl_mailbox.c | 364 ++++++++++++++++++ > drivers/gpu/drm/xe/xe_sysctrl_mailbox.h | 31 ++ > drivers/gpu/drm/xe/xe_sysctrl_mailbox_types.h | 35 ++ > drivers/gpu/drm/xe/xe_sysctrl_types.h | 32 ++ > 13 files changed, 650 insertions(+) > create mode 100644 drivers/gpu/drm/xe/abi/xe_sysctrl_abi.h > create mode 100644 drivers/gpu/drm/xe/regs/xe_sysctrl_regs.h > create mode 100644 drivers/gpu/drm/xe/xe_sysctrl.c > create mode 100644 drivers/gpu/drm/xe/xe_sysctrl.h > create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_mailbox.c > create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_mailbox.h > create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_mailbox_types.h > create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_types.h >