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01499ae673
When debugging MSI-related hardware issues (e.g. interrupt delivery failures), developers currently need to either: 1. Recompile the kernel with dynamic debug for tracing msi_desc. 2. Manually read device registers through low-level tools. Both approaches become challenging in production environments where dynamic debugging is often disabled. The interrupt core provides a debugfs interface for inspection of interrupt related data, which contains the per interrupt information in the view of the hierarchical interrupt domains. Though this interface does not expose the MSI address/data pair, which is important information to: - Verify whether the MSI configuration matches the hardware expectations - Diagnose interrupt routing errors (e.g., mismatched destination ID) - Validate remapping behavior in virtualized environments Implement the debug_show() callback for the generic MSI interrupt domains, and use it to expose the MSI address/data pair in the per interrupt diagnostics. Sample output: address_hi: 0x00000000 address_lo: 0xfe670040 msg_data: 0x00000001 [ tglx: Massaged change log. Use irq_data_get_msi_desc() to avoid pointless lookup. ] Signed-off-by: Hans Zhang <18255117159@163.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250303121008.309265-1-18255117159@163.com |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.