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b2d756199b
Add per pci device vram_d3cold_threshold Sysfs to control the d3cold allowed knob. Adding a d3cold structure embedded in xe_device to encapsulate d3cold related stuff. v2: - Check total vram before initializing default threshold. [Riana] - Add static scope to vram_d3cold_threshold DEVICE_ATTR. [Riana] v3: - Fixed cosmetics review comment. [Riana] - Fixed CI Hook failures. - Used drmm_mutex_init(). v4: - Fixed kernel-doc warnings. v5: - Added doc explaining need for the device sysfs. [Rodrigo] - Removed TODO comment. Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com> Reviewed-by: Riana Tauro <riana.tauro@intel.com> Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230718080703.239343-4-anshuman.gupta@intel.com Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2023 Intel Corporation
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*/
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#include <linux/kobject.h>
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#include <linux/pci.h>
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#include <linux/sysfs.h>
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#include <drm/drm_managed.h>
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#include "xe_device.h"
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#include "xe_device_sysfs.h"
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#include "xe_pm.h"
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/**
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* DOC: Xe device sysfs
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* Xe driver requires exposing certain tunable knobs controlled by user space for
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* each graphics device. Considering this, we need to add sysfs attributes at device
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* level granularity.
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* These sysfs attributes will be available under pci device kobj directory.
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*
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* vram_d3cold_threshold - Report/change vram used threshold(in MB) below
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* which vram save/restore is permissible during runtime D3cold entry/exit.
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*/
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static ssize_t
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vram_d3cold_threshold_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct xe_device *xe = pdev_to_xe_device(pdev);
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int ret;
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if (!xe)
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return -EINVAL;
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ret = sysfs_emit(buf, "%d\n", xe->d3cold.vram_threshold);
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return ret;
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}
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static ssize_t
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vram_d3cold_threshold_store(struct device *dev, struct device_attribute *attr,
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const char *buff, size_t count)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct xe_device *xe = pdev_to_xe_device(pdev);
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u32 vram_d3cold_threshold;
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int ret;
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if (!xe)
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return -EINVAL;
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ret = kstrtou32(buff, 0, &vram_d3cold_threshold);
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if (ret)
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return ret;
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drm_dbg(&xe->drm, "vram_d3cold_threshold: %u\n", vram_d3cold_threshold);
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ret = xe_pm_set_vram_threshold(xe, vram_d3cold_threshold);
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return ret ?: count;
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}
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static DEVICE_ATTR_RW(vram_d3cold_threshold);
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static void xe_device_sysfs_fini(struct drm_device *drm, void *arg)
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{
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struct xe_device *xe = arg;
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sysfs_remove_file(&xe->drm.dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
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}
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void xe_device_sysfs_init(struct xe_device *xe)
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{
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struct device *dev = xe->drm.dev;
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int ret;
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ret = sysfs_create_file(&dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
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if (ret) {
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drm_warn(&xe->drm, "Failed to create sysfs file\n");
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return;
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}
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ret = drmm_add_action_or_reset(&xe->drm, xe_device_sysfs_fini, xe);
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if (ret)
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drm_warn(&xe->drm, "Failed to add sysfs fini drm action\n");
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}
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