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![Lukas Wunner](/assets/img/avatar_default.png)
The PM core introduced the ability to keep devices runtime suspended during the entire system suspend/resume process with commitaae4518b31
("PM / sleep: Mechanism to avoid resuming runtime-suspended devices unnecessarily"). Before this so-called "direct-complete" procedure was introduced, devices were always runtime resumed only to be immediately put to sleep again using their ->suspend hook. Direct-complete is enabled by returning a positive value from the ->prepare hook. The PCI core usually does this automatically. Direct-complete is only available for a device if all children use it as well. Currently we cannot support direct-complete for DRM drivers because the DRM core automatically registers multiple DRM minors which belong to device class drm_class, and drm_class uses a struct dev_pm_ops which lacks the ->prepare callback. While this could be solved by adding the missing ->prepare callback, closer inspection shows that there are no DRM drivers left which declare the legacy ->suspend and ->resume callbacks in their drm_driver struct. The last ones to remove them were i915 with commit1751fcf9f9
("drm/i915: Fix module initialisation, v2.") and exynos with commite7fefb1d5a
("drm/exynos: remove legacy ->suspend()/resume()"). Consequently the struct dev_pm_ops of drm_class is now dead code. Remove it. If no dev_pm_ops is declared for a device, the PM core automatically enables direct-complete for it, thereby making that mechanism available to the parent DRM PCI devices. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/da848fcd5ca72a35d9a722e644719977a47bb7ba.1465382836.git.lukas@wunner.de
416 lines
10 KiB
C
416 lines
10 KiB
C
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/*
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* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
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* extra sysfs attribute from DRM. Normal drm_sysfs_class
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* does not allow adding attributes.
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*
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* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
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* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (c) 2003-2004 IBM Corp.
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/device.h>
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#include <linux/kdev_t.h>
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#include <linux/gfp.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <drm/drm_sysfs.h>
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#include <drm/drm_core.h>
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#include <drm/drmP.h>
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#include "drm_internal.h"
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#define to_drm_minor(d) dev_get_drvdata(d)
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#define to_drm_connector(d) dev_get_drvdata(d)
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static struct device_type drm_sysfs_device_minor = {
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.name = "drm_minor"
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};
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struct class *drm_class;
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static char *drm_devnode(struct device *dev, umode_t *mode)
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{
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return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
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}
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static CLASS_ATTR_STRING(version, S_IRUGO,
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CORE_NAME " "
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__stringify(CORE_MAJOR) "."
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__stringify(CORE_MINOR) "."
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__stringify(CORE_PATCHLEVEL) " "
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CORE_DATE);
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/**
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* drm_sysfs_init - initialize sysfs helpers
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*
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* This is used to create the DRM class, which is the implicit parent of any
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* other top-level DRM sysfs objects.
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*
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* You must call drm_sysfs_destroy() to release the allocated resources.
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*
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* Return: 0 on success, negative error code on failure.
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*/
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int drm_sysfs_init(void)
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{
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int err;
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drm_class = class_create(THIS_MODULE, "drm");
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if (IS_ERR(drm_class))
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return PTR_ERR(drm_class);
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err = class_create_file(drm_class, &class_attr_version.attr);
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if (err) {
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class_destroy(drm_class);
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drm_class = NULL;
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return err;
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}
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drm_class->devnode = drm_devnode;
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return 0;
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}
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/**
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* drm_sysfs_destroy - destroys DRM class
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*
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* Destroy the DRM device class.
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*/
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void drm_sysfs_destroy(void)
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{
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if (IS_ERR_OR_NULL(drm_class))
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return;
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class_remove_file(drm_class, &class_attr_version.attr);
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class_destroy(drm_class);
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drm_class = NULL;
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}
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/*
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* Connector properties
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*/
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static ssize_t status_store(struct device *device,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct drm_connector *connector = to_drm_connector(device);
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struct drm_device *dev = connector->dev;
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enum drm_connector_force old_force;
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int ret;
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ret = mutex_lock_interruptible(&dev->mode_config.mutex);
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if (ret)
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return ret;
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old_force = connector->force;
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if (sysfs_streq(buf, "detect"))
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connector->force = 0;
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else if (sysfs_streq(buf, "on"))
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connector->force = DRM_FORCE_ON;
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else if (sysfs_streq(buf, "on-digital"))
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connector->force = DRM_FORCE_ON_DIGITAL;
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else if (sysfs_streq(buf, "off"))
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connector->force = DRM_FORCE_OFF;
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else
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ret = -EINVAL;
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if (old_force != connector->force || !connector->force) {
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
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connector->base.id,
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connector->name,
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old_force, connector->force);
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connector->funcs->fill_modes(connector,
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dev->mode_config.max_width,
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dev->mode_config.max_height);
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}
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mutex_unlock(&dev->mode_config.mutex);
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return ret ? ret : count;
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}
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static ssize_t status_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct drm_connector *connector = to_drm_connector(device);
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enum drm_connector_status status;
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status = READ_ONCE(connector->status);
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return snprintf(buf, PAGE_SIZE, "%s\n",
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drm_get_connector_status_name(status));
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}
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static ssize_t dpms_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct drm_connector *connector = to_drm_connector(device);
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int dpms;
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dpms = READ_ONCE(connector->dpms);
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return snprintf(buf, PAGE_SIZE, "%s\n",
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drm_get_dpms_name(dpms));
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}
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static ssize_t enabled_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct drm_connector *connector = to_drm_connector(device);
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bool enabled;
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enabled = READ_ONCE(connector->encoder);
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return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
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}
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static ssize_t edid_show(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr, char *buf, loff_t off,
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size_t count)
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{
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struct device *connector_dev = kobj_to_dev(kobj);
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struct drm_connector *connector = to_drm_connector(connector_dev);
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unsigned char *edid;
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size_t size;
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ssize_t ret = 0;
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mutex_lock(&connector->dev->mode_config.mutex);
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if (!connector->edid_blob_ptr)
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goto unlock;
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edid = connector->edid_blob_ptr->data;
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size = connector->edid_blob_ptr->length;
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if (!edid)
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goto unlock;
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if (off >= size)
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goto unlock;
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if (off + count > size)
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count = size - off;
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memcpy(buf, edid + off, count);
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ret = count;
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unlock:
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mutex_unlock(&connector->dev->mode_config.mutex);
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return ret;
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}
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static ssize_t modes_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct drm_connector *connector = to_drm_connector(device);
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struct drm_display_mode *mode;
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int written = 0;
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mutex_lock(&connector->dev->mode_config.mutex);
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list_for_each_entry(mode, &connector->modes, head) {
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written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
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mode->name);
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}
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mutex_unlock(&connector->dev->mode_config.mutex);
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return written;
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}
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static DEVICE_ATTR_RW(status);
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static DEVICE_ATTR_RO(enabled);
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static DEVICE_ATTR_RO(dpms);
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static DEVICE_ATTR_RO(modes);
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static struct attribute *connector_dev_attrs[] = {
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&dev_attr_status.attr,
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&dev_attr_enabled.attr,
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&dev_attr_dpms.attr,
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&dev_attr_modes.attr,
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NULL
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};
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static struct bin_attribute edid_attr = {
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.attr.name = "edid",
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.attr.mode = 0444,
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.size = 0,
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.read = edid_show,
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};
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static struct bin_attribute *connector_bin_attrs[] = {
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&edid_attr,
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NULL
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};
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static const struct attribute_group connector_dev_group = {
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.attrs = connector_dev_attrs,
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.bin_attrs = connector_bin_attrs,
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};
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static const struct attribute_group *connector_dev_groups[] = {
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&connector_dev_group,
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NULL
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};
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/**
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* drm_sysfs_connector_add - add a connector to sysfs
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* @connector: connector to add
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*
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* Create a connector device in sysfs, along with its associated connector
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* properties (so far, connection status, dpms, mode list & edid) and
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* generate a hotplug event so userspace knows there's a new connector
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* available.
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*/
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int drm_sysfs_connector_add(struct drm_connector *connector)
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{
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struct drm_device *dev = connector->dev;
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if (connector->kdev)
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return 0;
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connector->kdev =
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device_create_with_groups(drm_class, dev->primary->kdev, 0,
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connector, connector_dev_groups,
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"card%d-%s", dev->primary->index,
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connector->name);
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DRM_DEBUG("adding \"%s\" to sysfs\n",
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connector->name);
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if (IS_ERR(connector->kdev)) {
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DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
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return PTR_ERR(connector->kdev);
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}
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/* Let userspace know we have a new connector */
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drm_sysfs_hotplug_event(dev);
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return 0;
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}
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/**
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* drm_sysfs_connector_remove - remove an connector device from sysfs
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* @connector: connector to remove
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*
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* Remove @connector and its associated attributes from sysfs. Note that
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* the device model core will take care of sending the "remove" uevent
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* at this time, so we don't need to do it.
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*
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* Note:
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* This routine should only be called if the connector was previously
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* successfully registered. If @connector hasn't been registered yet,
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* you'll likely see a panic somewhere deep in sysfs code when called.
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*/
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void drm_sysfs_connector_remove(struct drm_connector *connector)
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{
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if (!connector->kdev)
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return;
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DRM_DEBUG("removing \"%s\" from sysfs\n",
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connector->name);
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device_unregister(connector->kdev);
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connector->kdev = NULL;
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}
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/**
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* drm_sysfs_hotplug_event - generate a DRM uevent
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* @dev: DRM device
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*
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* Send a uevent for the DRM device specified by @dev. Currently we only
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* set HOTPLUG=1 in the uevent environment, but this could be expanded to
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* deal with other types of events.
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*/
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void drm_sysfs_hotplug_event(struct drm_device *dev)
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{
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char *event_string = "HOTPLUG=1";
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char *envp[] = { event_string, NULL };
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DRM_DEBUG("generating hotplug event\n");
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kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
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}
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EXPORT_SYMBOL(drm_sysfs_hotplug_event);
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static void drm_sysfs_release(struct device *dev)
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{
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kfree(dev);
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}
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/**
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* drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
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* @minor: minor to allocate sysfs device for
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*
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* This allocates a new sysfs device for @minor and returns it. The device is
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* not registered nor linked. The caller has to use device_add() and
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* device_del() to register and unregister it.
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*
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* Note that dev_get_drvdata() on the new device will return the minor.
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* However, the device does not hold a ref-count to the minor nor to the
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* underlying drm_device. This is unproblematic as long as you access the
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* private data only in sysfs callbacks. device_del() disables those
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* synchronously, so they cannot be called after you cleanup a minor.
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*/
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struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
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{
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const char *minor_str;
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struct device *kdev;
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int r;
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if (minor->type == DRM_MINOR_CONTROL)
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minor_str = "controlD%d";
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else if (minor->type == DRM_MINOR_RENDER)
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minor_str = "renderD%d";
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else
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minor_str = "card%d";
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kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
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if (!kdev)
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return ERR_PTR(-ENOMEM);
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device_initialize(kdev);
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kdev->devt = MKDEV(DRM_MAJOR, minor->index);
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kdev->class = drm_class;
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kdev->type = &drm_sysfs_device_minor;
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kdev->parent = minor->dev->dev;
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kdev->release = drm_sysfs_release;
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dev_set_drvdata(kdev, minor);
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r = dev_set_name(kdev, minor_str, minor->index);
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if (r < 0)
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goto err_free;
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return kdev;
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err_free:
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put_device(kdev);
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return ERR_PTR(r);
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}
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/**
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* drm_class_device_register - Register a struct device in the drm class.
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*
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* @dev: pointer to struct device to register.
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*
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* @dev should have all relevant members pre-filled with the exception
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* of the class member. In particular, the device_type member must
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* be set.
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*/
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int drm_class_device_register(struct device *dev)
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{
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if (!drm_class || IS_ERR(drm_class))
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return -ENOENT;
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dev->class = drm_class;
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return device_register(dev);
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}
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EXPORT_SYMBOL_GPL(drm_class_device_register);
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void drm_class_device_unregister(struct device *dev)
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{
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return device_unregister(dev);
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}
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EXPORT_SYMBOL_GPL(drm_class_device_unregister);
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