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Praveen Talari <praveen.talari@oss.qualcomm.com> says: The GENI framework is used by multiple drivers including UART, I2C, and SPI. When hardware-related failures occur, each driver typically relies on local logging, which often lacks sufficient information to determine the exact controller state. This series introduces a common tracing mechanism for GENI Serial Engine debug registers and demonstrates its use in the SPI driver. Patch 1 adds a new tracepoint that captures an extensive set of GENI SE registers, including command state, interrupt status, FIFO state, DMA configuration, and clock-related information. Patch 2 hooks the tracepoint into SPI error paths so that register snapshots are automatically generated when timeouts or transfer-related failures occur. Usage examples: Enable all I2C traces: echo 1 > /sys/kernel/tracing/events/qcom_geni_se/enable cat /sys/kernel/debug/tracing/trace_pipe Example trace output: 114.291299: geni_se_regs: 888000.spi: m_cmd0=0x18000000 m_irq_status=0x00000080 s_cmd0=0x00000000 s_irq_status=0x08000000 geni_status=0x00000000 geni_ios=0x00000000 m_cmd_ctrl=0x00000000 m_cmd_err=0x00000000 m_fw_err=0x00000000 tx_fifo_sts=0x00000000 rx_fifo_sts=0x00000000 tx_watermark=0x00000000 rx_watermark=0x0000000d rx_watermark_rfr=0x0000000e m_gp_length=0x00000004 s_gp_length=0x00000000 dma_tx_irq=0x00000000 dma_rx_irq=0x00000000 dma_tx_irq_en=0x0000000f dma_rx_irq_en=0x0000001f dma_rx_len=0x00001400 dma_rx_len_in=0x00001400 dma_tx_len=0x00001400 dma_tx_len_in=0x00001400 dma_tx_ptr_l=0xffffc000 dma_tx_ptr_h=0x00000000 dma_rx_ptr_l=0xffffa000 dma_rx_ptr_h=0x00000000 dma_tx_attr=0x00000001 dma_tx_max_burst=0x00000002 dma_rx_attr=0x00000000 dma_rx_max_burst=0x00000002 dma_if_en=0x00000009 dma_if_en_ro=0x00000001 dma_general_cfg=0x0000000f dma_qsb_trans_cfg=0x00000000 dma_dbg=0x00000000 m_irq_en=0x7fc0007f s_irq_en=0x03003e3e gsi_event_en=0x00000000 se_irq_en=0x0000000f ser_m_clk_cfg=0x000000a1 ser_s_clk_cfg=0x00000000 general_cfg=0x00000048 output_ctrl=0x0000007f clk_ctrl_ro=0x00000001 fifo_if_dis=0x00000000 fw_multilock_msa=0x00000000 clk_sel=0x00000005 Link: https://patch.msgid.link/20260729-add-tracepoints-for-se-reg-dump-v4-0-08bbd63b0ed2@oss.qualcomm.com
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. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer - Getting started with kernel development * Academic Researcher - Studying kernel internals and architecture * Security Expert - Hardening and vulnerability analysis * Backport/Maintenance Engineer - Maintaining stable kernels * System Administrator - Configuring and troubleshooting * Maintainer - Leading subsystems and reviewing patches * Hardware Vendor - Writing drivers for new hardware * Distribution Maintainer - Packaging kernels for distros * AI Coding Assistant - LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! 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. Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst