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6a8789e948
Introduce a per-GT debugfs knob, 'gpgpu_preemption_level', to allow
overriding the GPGPU preemption level on a per-context basis for newly
created LRCs.
Add an RTP rule to enable per-context control via FF_SLICE_CS_CHICKEN1,
allowing the preemption level to be programmed directly into the LRC
image at CTX_CS_CHICKEN1 during context initialization.
v9:
- Move the per-context/GT-scoped behavior description from the enum
kerneldoc to the gpgpu_preemption_level member kerneldoc, and drop
the kzalloc zero-initialization note. (Gustavo)
v8:
- Encapsulate LRC preemption programming into
xe_lrc_set_gpgpu_preemption_level() (Gustavo)
- Add xe_gt_WARN and early return for unexpected preemption level values
to prevent invalid CS_CHICKEN1 programming. (Gustavo)
- Change -EPERM to -EINVAL for MTP fused off check (Gustavo)
- Combine FF_SLICE_CS_CHICKEN1 RTP rule using OR macro (Gustavo)
v7:
- Restrict XEHP_FUSE4 read to Xe2+ primary GTs to prevent invalid
Media GT accesses and SR-IOV warnings. (Sashiko)
v6:
- Add missing xe_gt_printk.h include to fix compilation failure.
v5:
- Use correct offset for CTX_CS_CHICKEN1. (Matt)
- Restrict to the RCS engine. (Matt)
- Drop LRC layout table modifications; dummy layouts do not need late
context registers. (Matt)
- Stash WMTP fuse state at boot to remove pm/forcewake from debugfs.
(Matt)
- Rename debugfs knob to 'gpgpu_preemption_level'. (Matt)
- Use simple_write_to_buffer() and remove unnecessary READ_ONCE/
WRITE_ONCE macros. (Matt)
- Do not restrict debugfs visibility for SR-IOV VFs. (Matt)
v4
- Fix incorrect NOP padding in the RCS context layout. (Sashiko)
v3:
- Wrapped XEHP_FUSE4 forcewake read with xe_pm_runtime_get/put to
prevent PCIe aborts/timeouts when the GPU is in D3hot/D3cold. (sashiko)
- Fixed NOP macro truncation by splitting padding offsets larger than
0x7f into multiple NOPs, ensuring correct context layout. (sashiko)
- Converted CTX_CS_CHICKEN1 initialization to a read-modify-write
sequence to avoid overwriting golden context mask bits. (sashiko)
- Removed the FF_SLICE_CS_CHICKEN1 workaround for CCS engines, as
compute engines lack this 3D fixed-function register, which was
causing GuC "illegal register" panics on initialization.
v2:
- Dropped the WA BB/MI_LRI path; per Bspec, CS_CHICKEN1 is context
save/restore state at DW 0x00E2, so we map CTX_CS_CHICKEN1 and program
it directly in LRC init via xe_lrc_write_ctx_reg(). (Matt)
- Split Xe2 CCS context offsets into a dedicated xe2_ccs_offsets array
to map CS_CHICKEN1 without polluting other XCS engines.
- Converted the debugfs interface from a binary boolean to a
multi-option string knob ("default", "mid-thread", "thread-group",
"command"). (Gustavo)
- Restricted file creation to the Physical Function
(!IS_SRIOV_VF). (Gustavo)
- Added kernel tainting (TAINT_USER) when deviating from
defaults. (Gustavo)
- Added power-safe hardware fuse check (FUSE4 register 0x9114[20],
CFEG_WMTP_DISABLE) before allowing MTP selection. (Matt)
Signed-off-by: Varun Gupta <varun.gupta@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/20260827072106.1138741-2-varun.gupta@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. 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