drm/xe: dma-buf Add VRAM pin limit for backports when dmem_cgroup is not present - #514
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| From 9adf8d7f4ca55cffdbe2cc58a023d2dae6c98cb0 Mon Sep 17 00:00:00 2001 | ||
| From: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com> | ||
| Date: Mon, 3 Aug 2026 10:40:35 +0530 | ||
| Subject: [PATCH 7/8] drm/xe/vram: show pinned vram in debug |
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validation kunit is not supported . Till igt comes
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…not present Remove the dummy drmm_cgroup_register_region() stub from the backport header and replace it with a driver-level VRAM pin accounting and enforcement mechanism for kernels where dmem_cgroup is not available. The dmem_cgroup subsystem, introduced in newer kernels, provides per-cgroup limits on device memory usage such as GPU VRAM. On older backport target kernels this subsystem is absent (BPM_DRMM_CGROUP_REGISTER_REGION_NOT_PRESENT), so no VRAM pinning limits were enforced — external dma-buf consumers could pin an unbounded amount of VRAM, potentially starving the GPU driver and local workloads. The VRAM pin percentage is configurable via the module parameter: xe.pin_vram_percent=<0-100> (default: 50) A value of 0 disables the limit (unlimited pinning). Signed-off-by: Pravalika Gurram <pravalika.gurram@intel.com>
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Remove the dummy drmm_cgroup_register_region() stub from the backport
header and replace it with a driver-level VRAM pin accounting and
enforcement mechanism for kernels where dmem_cgroup is not available.
The dmem_cgroup subsystem, introduced in
newer kernels, provides per-cgroup limits on device memory usage such
as GPU VRAM. On older backport target kernels this subsystem is absent
(BPM_DRMM_CGROUP_REGISTER_REGION_NOT_PRESENT), so no VRAM pinning
limits were enforced — external dma-buf consumers could pin an
unbounded amount of VRAM, potentially starving the GPU driver and
local workloads.
The VRAM pin percentage is configurable via the module parameter:
xe.pin_vram_percent=<0-100> (default: 50)
A value of 0 disables the limit (unlimited pinning).
Signed-off-by: Pravalika Gurram pravalika.gurram@intel.com