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Most of the PF's debugfs files (and their implementations) are based on the GT hierarchy even if files are related to GGTT or LMEM data, that are related to the tile. While we could reach the tile data from any GT, to avoid potential misuse, some functions allow to be used on the primary GT only, and may use asserts to enforce that. In our case, the following assert could be seen when reading the /sys/kernel/debug/dri/0000:00:02.0/gt1/pf/ggtt_available [ ] xe 0000:00:02.0: [drm] Assertion `!xe_gt_is_media_type(gt)` failed! [ ] WARNING: CPU: 4 PID: 10609 at drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c:379 pf_get_spare_ggtt+0x256/0x4e0 [xe] [ ] RIP: 0010:pf_get_spare_ggtt+0x256/0x4e0 [xe] [ ] Call Trace: [ ] <TASK> [ ] xe_gt_sriov_pf_config_print_available_ggtt+0xb7/0x480 [xe] [ ] ? __memcg_slab_post_alloc_hook+0x12f/0x3f0 [ ] xe_gt_debugfs_simple_show+0x7b/0xb0 [xe] [ ] ? __pfx___drm_printfn_seq_file+0x10/0x10 [ ] ? __pfx___drm_puts_seq_file+0x10/0x10 [ ] seq_read_iter+0x139/0x4e0 [ ] seq_read+0x11d/0x160 [ ] full_proxy_read+0x6b/0xb0 [ ] vfs_read+0xfa/0x390 Fix that by moving GGTT/LMEM debugfs attributes to separate lists and register them only when applicable (on primary GT, on DGFX). Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Tested-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com> Reviewed-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com> Link: https://lore.kernel.org/r/20250411193030.1865-1-michal.wajdeczko@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.