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drm/xe/pf: Add documentation for vram_quota

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Add initial documentation for recently added VRAM provisioning
Xe driver specific SR-IOV sysfs files under device/sriov_admin.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20260218205553.3561-11-michal.wajdeczko@intel.com
This commit is contained in:
Michal Wajdeczko 2026-02-18 21:55:52 +01:00
parent d039fa856e
commit 9ca192cbcd
1 changed files with 31 additions and 0 deletions
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31
Documentation/ABI/testing/sysfs-driver-intel-xe-sriov
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@ -129,6 +129,37 @@ Description:
-EIO if FW refuses to change the provisioning.
What: /sys/bus/pci/drivers/xe/.../sriov_admin/.bulk_profile/vram_quota
What: /sys/bus/pci/drivers/xe/.../sriov_admin/vf<n>/profile/vram_quota
Date: February 2026
KernelVersion: 7.0
Contact: intel-xe@lists.freedesktop.org
Description:
These files allow to perform initial VFs VRAM provisioning prior to VFs
enabling or to change VFs VRAM provisioning once the VFs are enabled.
Any non-zero initial VRAM provisioning will block VFs auto-provisioning.
Without initial VRAM provisioning those files will show result of the
VRAM auto-provisioning performed by the PF once the VFs are enabled.
Once the VFs are disabled, all VRAM provisioning will be released.
These files are visible only on discrete Intel Xe platforms with VRAM
and are writeable only if dynamic VFs VRAM provisioning is supported.
.bulk_profile/vram_quota: (WO) unsigned integer
The amount of the provisioned VRAM in [bytes] for each VF.
Actual quota value might be aligned per HW/FW requirements.
profile/vram_quota: (RW) unsigned integer
The amount of the provisioned VRAM in [bytes] for this VF.
Actual quota value might be aligned per HW/FW requirements.
Default is 0 (unprovisioned).
Writes to these attributes may fail with errors like:
-EINVAL if provided input is malformed or not recognized,
-EPERM if change is not applicable on given HW/FW,
-EIO if FW refuses to change the provisioning.
What: /sys/bus/pci/drivers/xe/.../sriov_admin/vf<n>/stop
Date: October 2025
KernelVersion: 6.19