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Requirement for PSMI capture is to have a physically contiguous buffer. All the needed configuration is done by the userspace tool directly to the GPU via mmio access. This interface only support allocating from VRAM regions. For integrated devices, the PSMI buffer is in SYSTEM memory and should be allocated by userspace using hugetlbfs. Here we add the ability to allocate a region of physically contiguous memory by writing to debugfs file (listed below). For multi-tile devices, the capture tool requires ability to allocate a capture buffer per tile (VRAM region) and so user can specify a region_mask. The tool then can mmap the buffers via direct mmap of the PCIBAR via sysfs. To support the capture tool, 3 new debugfs entries are added: psmi_capture_addr - physical address per VRAM region's capture buffer psmi_capture_region_mask - select which region(s) to allocate a buffer psmi_capture_size - size of current capture buffer Writing psmi_capture_size will allocate new buffer of requested size per region after freeing any current buffers. Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com> Original-author: Brian Welty <brian.welty@intel.com> Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com> # v2 Link: https://lore.kernel.org/r/20250821-psmi-v5-2-34ab7550d3d8@intel.com Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
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.