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Expose sysfs files for each DBC representing the current state of that DBC. For example, sysfs for DBC ID 0 and accel minor number 0 looks like this, /sys/class/accel/accel0/dbc0_state Following are the states and their corresponding values, DBC_STATE_IDLE (0) DBC_STATE_ASSIGNED (1) DBC_STATE_BEFORE_SHUTDOWN (2) DBC_STATE_AFTER_SHUTDOWN (3) DBC_STATE_BEFORE_POWER_UP (4) DBC_STATE_AFTER_POWER_UP (5) Signed-off-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com> Signed-off-by: Youssef Samir <youssef.abdulrahman@oss.qualcomm.com> Signed-off-by: Zack McKevitt <zachary.mckevitt@oss.qualcomm.com> Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com> Signed-off-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com> Link: https://patch.msgid.link/20251031174059.2814445-2-zachary.mckevitt@oss.qualcomm.com
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2020-2025, The Linux Foundation. All rights reserved. */
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#include <drm/drm_file.h>
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#include <drm/drm_managed.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/kobject.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include "qaic.h"
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#define NAME_LEN 14
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struct dbc_attribute {
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struct device_attribute dev_attr;
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u32 dbc_id;
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char name[NAME_LEN];
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};
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static ssize_t dbc_state_show(struct device *dev, struct device_attribute *a, char *buf)
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{
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struct dbc_attribute *dbc_attr = container_of(a, struct dbc_attribute, dev_attr);
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struct drm_minor *minor = dev_get_drvdata(dev);
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struct qaic_device *qdev;
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qdev = to_qaic_device(minor->dev);
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return sysfs_emit(buf, "%d\n", qdev->dbc[dbc_attr->dbc_id].state);
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}
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void set_dbc_state(struct qaic_device *qdev, u32 dbc_id, unsigned int state)
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{
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struct device *kdev = to_accel_kdev(qdev->qddev);
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char *envp[3] = {};
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char state_str[16];
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char id_str[12];
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envp[0] = id_str;
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envp[1] = state_str;
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if (state >= DBC_STATE_MAX)
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return;
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if (dbc_id >= qdev->num_dbc)
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return;
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if (state == qdev->dbc[dbc_id].state)
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return;
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scnprintf(id_str, ARRAY_SIZE(id_str), "DBC_ID=%d", dbc_id);
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scnprintf(state_str, ARRAY_SIZE(state_str), "DBC_STATE=%d", state);
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qdev->dbc[dbc_id].state = state;
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kobject_uevent_env(&kdev->kobj, KOBJ_CHANGE, envp);
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}
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int qaic_sysfs_init(struct qaic_drm_device *qddev)
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{
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struct device *kdev = to_accel_kdev(qddev);
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struct drm_device *drm = to_drm(qddev);
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u32 num_dbc = qddev->qdev->num_dbc;
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struct dbc_attribute *dbc_attrs;
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int i, ret;
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dbc_attrs = drmm_kcalloc(drm, num_dbc, sizeof(*dbc_attrs), GFP_KERNEL);
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if (!dbc_attrs)
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return -ENOMEM;
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for (i = 0; i < num_dbc; ++i) {
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struct dbc_attribute *dbc_attr = &dbc_attrs[i];
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sysfs_attr_init(&dbc_attr->dev_attr.attr);
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dbc_attr->dbc_id = i;
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scnprintf(dbc_attr->name, NAME_LEN, "dbc%d_state", i);
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dbc_attr->dev_attr.attr.name = dbc_attr->name;
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dbc_attr->dev_attr.attr.mode = 0444;
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dbc_attr->dev_attr.show = dbc_state_show;
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ret = sysfs_create_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
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if (ret) {
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int j;
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for (j = 0; j < i; ++j) {
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dbc_attr = &dbc_attrs[j];
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sysfs_remove_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
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}
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drmm_kfree(drm, dbc_attrs);
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return ret;
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}
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}
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qddev->sysfs_attrs = dbc_attrs;
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return 0;
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}
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void qaic_sysfs_remove(struct qaic_drm_device *qddev)
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{
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struct dbc_attribute *dbc_attrs = qddev->sysfs_attrs;
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struct device *kdev = to_accel_kdev(qddev);
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u32 num_dbc = qddev->qdev->num_dbc;
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int i;
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if (!dbc_attrs)
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return;
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qddev->sysfs_attrs = NULL;
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for (i = 0; i < num_dbc; ++i)
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sysfs_remove_file(&kdev->kobj, &dbc_attrs[i].dev_attr.attr);
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drmm_kfree(to_drm(qddev), dbc_attrs);
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}
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