From bf17766f108309027aac2bfe184df6088dfd7384 Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Mon, 14 Oct 2024 10:55:21 +0200 Subject: [PATCH 0491/5403] drm/client: Move suspend/resume into DRM client callbacks Suspend and resume is still tied to fbdev emulation. Modeset helpers and several drivers call drm_fb_helper_set_suspend_unlocked() to inform the fbdev client about suspend/resume events. To make it work with arbitrary clients, add per-client callback functions for suspend and resume. Implement them for fbdev emulation with the existing drm_fb_helper_set_suspend_unlocked(). Then update DRM's modeset helpers to call the new interface. Clients that are not fbdev can now implement suspend/resume to their requirements. The callback parameter holds_console_lock is a workaround for i915, radeon and xe, which possibly call the interface while having the console lock acquired. Even though the commit doesn't modify these drivers, it already adds the flag to avoid churn later on. New code should not hold the console lock. v4: - clarify holds_console_lock in commit description (Jonathan) Signed-off-by: Thomas Zimmermann Reviewed-by: Jonathan Cavitt Link: https://patchwork.freedesktop.org/patch/msgid/20241014085740.582287-8-tzimmermann@suse.de --- drivers/gpu/drm/drm_client_event.c | 60 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_modeset_helper.c | 14 ++++--- include/drm/drm_client.h | 35 ++++++++++++++++ include/drm/drm_client_event.h | 2 + 4 files changed, 105 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/drm_client_event.c b/drivers/gpu/drm/drm_client_event.c index d13d44320c5c..c52e93643672 100644 --- a/drivers/gpu/drm/drm_client_event.c +++ b/drivers/gpu/drm/drm_client_event.c @@ -107,6 +107,66 @@ void drm_client_dev_restore(struct drm_device *dev) mutex_unlock(&dev->clientlist_mutex); } +static int drm_client_suspend(struct drm_client_dev *client, bool holds_console_lock) +{ + struct drm_device *dev = client->dev; + int ret = 0; + + if (drm_WARN_ON_ONCE(dev, client->suspended)) + return 0; + + if (client->funcs && client->funcs->suspend) + ret = client->funcs->suspend(client, holds_console_lock); + drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret); + + client->suspended = true; + + return ret; +} + +void drm_client_dev_suspend(struct drm_device *dev, bool holds_console_lock) +{ + struct drm_client_dev *client; + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry(client, &dev->clientlist, list) { + if (!client->suspended) + drm_client_suspend(client, holds_console_lock); + } + mutex_unlock(&dev->clientlist_mutex); +} +EXPORT_SYMBOL(drm_client_dev_suspend); + +static int drm_client_resume(struct drm_client_dev *client, bool holds_console_lock) +{ + struct drm_device *dev = client->dev; + int ret = 0; + + if (drm_WARN_ON_ONCE(dev, !client->suspended)) + return 0; + + if (client->funcs && client->funcs->resume) + ret = client->funcs->resume(client, holds_console_lock); + drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret); + + client->suspended = false; + + return ret; +} + +void drm_client_dev_resume(struct drm_device *dev, bool holds_console_lock) +{ + struct drm_client_dev *client; + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry(client, &dev->clientlist, list) { + if (client->suspended) + drm_client_resume(client, holds_console_lock); + } + mutex_unlock(&dev->clientlist_mutex); +} +EXPORT_SYMBOL(drm_client_dev_resume); + #ifdef CONFIG_DEBUG_FS static int drm_client_debugfs_internal_clients(struct seq_file *m, void *data) { diff --git a/drivers/gpu/drm/drm_modeset_helper.c b/drivers/gpu/drm/drm_modeset_helper.c index 2c582020cb42..5565464c1734 100644 --- a/drivers/gpu/drm/drm_modeset_helper.c +++ b/drivers/gpu/drm/drm_modeset_helper.c @@ -21,7 +21,7 @@ */ #include -#include +#include #include #include #include @@ -185,7 +185,7 @@ EXPORT_SYMBOL(drm_crtc_init); * Zero on success, negative error code on error. * * See also: - * drm_kms_helper_poll_disable() and drm_fb_helper_set_suspend_unlocked(). + * drm_kms_helper_poll_disable() and drm_client_dev_suspend(). */ int drm_mode_config_helper_suspend(struct drm_device *dev) { @@ -199,10 +199,11 @@ int drm_mode_config_helper_suspend(struct drm_device *dev) if (dev->mode_config.poll_enabled) drm_kms_helper_poll_disable(dev); - drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 1); + drm_client_dev_suspend(dev, false); state = drm_atomic_helper_suspend(dev); if (IS_ERR(state)) { - drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0); + drm_client_dev_resume(dev, false); + /* * Don't enable polling if it was never initialized */ @@ -230,7 +231,7 @@ EXPORT_SYMBOL(drm_mode_config_helper_suspend); * Zero on success, negative error code on error. * * See also: - * drm_fb_helper_set_suspend_unlocked() and drm_kms_helper_poll_enable(). + * drm_client_dev_resume() and drm_kms_helper_poll_enable(). */ int drm_mode_config_helper_resume(struct drm_device *dev) { @@ -247,7 +248,8 @@ int drm_mode_config_helper_resume(struct drm_device *dev) DRM_ERROR("Failed to resume (%d)\n", ret); dev->mode_config.suspend_state = NULL; - drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0); + drm_client_dev_resume(dev, false); + /* * Don't enable polling if it is not initialized */ diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h index dfd5afcc9463..c03c4b0f3e94 100644 --- a/include/drm/drm_client.h +++ b/include/drm/drm_client.h @@ -63,6 +63,34 @@ struct drm_client_funcs { * This callback is optional. */ int (*hotplug)(struct drm_client_dev *client); + + /** + * @suspend: + * + * Called when suspending the device. + * + * This callback is optional. + * + * FIXME: Some callers hold the console lock when invoking this + * function. This interferes with fbdev emulation, which + * also tries to acquire the lock. Push the console lock + * into the callback and remove 'holds_console_lock'. + */ + int (*suspend)(struct drm_client_dev *client, bool holds_console_lock); + + /** + * @resume: + * + * Called when resuming the device from suspend. + * + * This callback is optional. + * + * FIXME: Some callers hold the console lock when invoking this + * function. This interferes with fbdev emulation, which + * also tries to acquire the lock. Push the console lock + * into the callback and remove 'holds_console_lock'. + */ + int (*resume)(struct drm_client_dev *client, bool holds_console_lock); }; /** @@ -107,6 +135,13 @@ struct drm_client_dev { */ struct drm_mode_set *modesets; + /** + * @suspended: + * + * The client has been suspended. + */ + bool suspended; + /** * @hotplug_failed: * diff --git a/include/drm/drm_client_event.h b/include/drm/drm_client_event.h index 2c8915241120..72c97d111169 100644 --- a/include/drm/drm_client_event.h +++ b/include/drm/drm_client_event.h @@ -8,5 +8,7 @@ struct drm_device; void drm_client_dev_unregister(struct drm_device *dev); void drm_client_dev_hotplug(struct drm_device *dev); void drm_client_dev_restore(struct drm_device *dev); +void drm_client_dev_suspend(struct drm_device *dev, bool holds_console_lock); +void drm_client_dev_resume(struct drm_device *dev, bool holds_console_lock); #endif -- 2.54.0