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authorLukas Wunner <lukas@wunner.de>2018-03-03 10:53:24 +0100
committerLukas Wunner <lukas@wunner.de>2018-03-13 22:58:09 +0100
commit07f4f97d7b4bf325d9f558c5b58230387e4e57e0 (patch)
treeb297cfbe775326e8874e0e160624c508c432223e /drivers/gpu
parent8948ca1a12c9a039361bbc3e4627064153971d57 (diff)
vga_switcheroo: Use device link for HDA controller
Back in 2013, runtime PM for GPUs with integrated HDA controller was introduced with commits 0d69704ae348 ("gpu/vga_switcheroo: add driver control power feature. (v3)") and 246efa4a072f ("snd/hda: add runtime suspend/resume on optimus support (v4)"). Briefly, the idea was that the HDA controller is forced on and off in unison with the GPU. The original code is mostly still in place even though it was never a 100% perfect solution: E.g. on access to the HDA controller, the GPU is powered up via vga_switcheroo_runtime_resume_hdmi_audio() but there are no provisions to keep it resumed until access to the HDA controller has ceased: The GPU autosuspends after 5 seconds, rendering the HDA controller inaccessible. Additionally, a kludge is required when hda_intel.c probes: It has to check whether the GPU is powered down (check_hdmi_disabled()) and defer probing if so. However in the meantime (in v4.10) the driver core has gained a feature called device links which promises to solve such issues in a clean way: It allows us to declare a dependency from the HDA controller (consumer) to the GPU (supplier). The PM core then automagically ensures that the GPU is runtime resumed as long as the HDA controller's ->probe hook is executed and whenever the HDA controller is accessed. By default, the HDA controller has a dependency on its parent, a PCIe Root Port. Adding a device link creates another dependency on its sibling: PCIe Root Port ^ ^ | | | | HDA ===> GPU The device link is not only used for runtime PM, it also guarantees that on system sleep, the HDA controller suspends before the GPU and resumes after the GPU, and on system shutdown the HDA controller's ->shutdown hook is executed before the one of the GPU. It is a complete solution. Using this functionality is as simple as calling device_link_add(), which results in a dmesg entry like this: pci 0000:01:00.1: Linked as a consumer to 0000:01:00.0 The code for the GPU-governed audio power management can thus be removed (except where it's still needed for legacy manual power control). The device link is added in a PCI quirk rather than in hda_intel.c. It is therefore legal for the GPU to runtime suspend to D3cold even if the HDA controller is not bound to a driver or if CONFIG_SND_HDA_INTEL is not enabled, for accesses to the HDA controller will cause the GPU to wake up regardless if they're occurring outside of hda_intel.c (think config space readout via sysfs). Contrary to the previous implementation, the HDA controller's power state is now self-governed, rather than GPU-governed, whereas the GPU's power state is no longer fully self-governed. (The HDA controller needs to runtime suspend before the GPU can.) It is thus crucial that runtime PM is always activated on the HDA controller even if CONFIG_SND_HDA_POWER_SAVE_DEFAULT is set to 0 (which is the default), lest the GPU stays awake. This is achieved by setting the auto_runtime_pm flag on every codec and the AZX_DCAPS_PM_RUNTIME flag on the HDA controller. A side effect is that power consumption might be reduced if the GPU is in use but the HDA controller is not, because the HDA controller is now allowed to go to D3hot. Before, it was forced to stay in D0 as long as the GPU was in use. (There is no reduction in power consumption on my Nvidia GK107, but there might be on other chips.) The code paths for legacy manual power control are adjusted such that runtime PM is disabled during power off, thereby preventing the PM core from resuming the HDA controller. Note that the device link is not only added on vga_switcheroo capable systems, but for *any* GPU with integrated HDA controller. The idea is that the HDA controller streams audio via connectors located on the GPU, so the GPU needs to be on for the HDA controller to do anything useful. This commit implicitly fixes an unbalanced runtime PM ref upon unbind of hda_intel.c: On ->probe, a runtime PM ref was previously released under the condition "azx_has_pm_runtime(chip) || hda->use_vga_switcheroo", but on ->remove a runtime PM ref was only acquired under the first of those conditions. Thus, binding and unbinding the driver twice on a vga_switcheroo capable system caused the runtime PM refcount to drop below zero. The issue is resolved because the AZX_DCAPS_PM_RUNTIME flag is now always set if use_vga_switcheroo is true. For more information on device links please refer to: https://www.kernel.org/doc/html/latest/driver-api/device_link.html Documentation/driver-api/device_link.rst Cc: Dave Airlie <airlied@redhat.com> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Reviewed-by: Peter Wu <peter@lekensteyn.nl> Tested-by: Kai Heng Feng <kai.heng.feng@canonical.com> # AMD PowerXpress Tested-by: Mike Lothian <mike@fireburn.co.uk> # AMD PowerXpress Tested-by: Denis Lisov <dennis.lissov@gmail.com> # Nvidia Optimus Tested-by: Peter Wu <peter@lekensteyn.nl> # Nvidia Optimus Tested-by: Lukas Wunner <lukas@wunner.de> # MacBook Pro Signed-off-by: Lukas Wunner <lukas@wunner.de> Link: https://patchwork.freedesktop.org/patch/msgid/51bd38360ff502a8c42b1ebf4405ee1d3f27118d.1520068884.git.lukas@wunner.de
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c2
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_drm.c2
-rw-r--r--drivers/gpu/drm/radeon/radeon_drv.c2
-rw-r--r--drivers/gpu/vga/vga_switcheroo.c115
4 files changed, 8 insertions, 113 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 50afcf65181a..ba4335fd4f65 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -720,7 +720,6 @@ static int amdgpu_pmops_runtime_suspend(struct device *dev)
drm_dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
drm_kms_helper_poll_disable(drm_dev);
- vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_OFF);
ret = amdgpu_device_suspend(drm_dev, false, false);
pci_save_state(pdev);
@@ -757,7 +756,6 @@ static int amdgpu_pmops_runtime_resume(struct device *dev)
ret = amdgpu_device_resume(drm_dev, false, false);
drm_kms_helper_poll_enable(drm_dev);
- vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_ON);
drm_dev->switch_power_state = DRM_SWITCH_POWER_ON;
return 0;
}
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 3e293029e3a6..6959951d45d6 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -856,7 +856,6 @@ nouveau_pmops_runtime_suspend(struct device *dev)
}
drm_kms_helper_poll_disable(drm_dev);
- vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_OFF);
nouveau_switcheroo_optimus_dsm();
ret = nouveau_do_suspend(drm_dev, true);
pci_save_state(pdev);
@@ -891,7 +890,6 @@ nouveau_pmops_runtime_resume(struct device *dev)
/* do magic */
nvif_mask(&device->object, 0x088488, (1 << 25), (1 << 25));
- vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_ON);
drm_dev->switch_power_state = DRM_SWITCH_POWER_ON;
/* Monitors may have been connected / disconnected during suspend */
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 31dd04f6baa1..b28288a781ef 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -415,7 +415,6 @@ static int radeon_pmops_runtime_suspend(struct device *dev)
drm_dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
drm_kms_helper_poll_disable(drm_dev);
- vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_OFF);
ret = radeon_suspend_kms(drm_dev, false, false, false);
pci_save_state(pdev);
@@ -452,7 +451,6 @@ static int radeon_pmops_runtime_resume(struct device *dev)
ret = radeon_resume_kms(drm_dev, false, false);
drm_kms_helper_poll_enable(drm_dev);
- vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_ON);
drm_dev->switch_power_state = DRM_SWITCH_POWER_ON;
return 0;
}
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 2488af797020..4ee0ed642386 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -105,8 +105,7 @@
* @list: client list
*
* Registered client. A client can be either a GPU or an audio device on a GPU.
- * For audio clients, the @fb_info, @active and @driver_power_control members
- * are bogus.
+ * For audio clients, the @fb_info and @active members are bogus.
*/
struct vga_switcheroo_client {
struct pci_dev *pdev;
@@ -332,8 +331,8 @@ EXPORT_SYMBOL(vga_switcheroo_register_client);
* @ops: client callbacks
* @id: client identifier
*
- * Register audio client (audio device on a GPU). The power state of the
- * client is assumed to be ON. Beforehand, vga_switcheroo_client_probe_defer()
+ * Register audio client (audio device on a GPU). The client is assumed
+ * to use runtime PM. Beforehand, vga_switcheroo_client_probe_defer()
* shall be called to ensure that all prerequisites are met.
*
* Return: 0 on success, -ENOMEM on memory allocation error.
@@ -342,7 +341,7 @@ int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
const struct vga_switcheroo_client_ops *ops,
enum vga_switcheroo_client_id id)
{
- return register_client(pdev, ops, id | ID_BIT_AUDIO, false, false);
+ return register_client(pdev, ops, id | ID_BIT_AUDIO, false, true);
}
EXPORT_SYMBOL(vga_switcheroo_register_audio_client);
@@ -655,10 +654,8 @@ static void set_audio_state(enum vga_switcheroo_client_id id,
struct vga_switcheroo_client *client;
client = find_client_from_id(&vgasr_priv.clients, id | ID_BIT_AUDIO);
- if (client) {
+ if (client)
client->ops->set_gpu_state(client->pdev, state);
- client->pwr_state = state;
- }
}
/* stage one happens before delay */
@@ -953,10 +950,6 @@ EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch);
* Specifying nouveau.runpm=0, radeon.runpm=0 or amdgpu.runpm=0 on the kernel
* command line disables it.
*
- * When the driver decides to power up or down, it notifies vga_switcheroo
- * thereof so that it can power the audio device on the GPU up or down.
- * This is achieved by vga_switcheroo_set_dynamic_switch().
- *
* After the GPU has been suspended, the handler needs to be called to cut
* power to the GPU. Likewise it needs to reinstate power before the GPU
* can resume. This is achieved by vga_switcheroo_init_domain_pm_ops(),
@@ -964,8 +957,9 @@ EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch);
* calls to the handler.
*
* When the audio device resumes, the GPU needs to be woken. This is achieved
- * by vga_switcheroo_init_domain_pm_optimus_hdmi_audio(), which augments the
- * audio device's resume function.
+ * by a PCI quirk which calls device_link_add() to declare a dependency on the
+ * GPU. That way, the GPU is kept awake whenever and as long as the audio
+ * device is in use.
*
* On muxed machines, if the mux is initially switched to the discrete GPU,
* the user ends up with a black screen when the GPU powers down after boot.
@@ -991,33 +985,6 @@ static void vga_switcheroo_power_switch(struct pci_dev *pdev,
vgasr_priv.handler->power_state(client->id, state);
}
-/**
- * vga_switcheroo_set_dynamic_switch() - helper for driver power control
- * @pdev: client pci device
- * @dynamic: new power state
- *
- * Helper for GPUs whose power state is controlled by the driver's runtime pm.
- * When the driver decides to power up or down, it notifies vga_switcheroo
- * thereof using this helper so that it can power the audio device on the GPU
- * up or down.
- */
-void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev,
- enum vga_switcheroo_state dynamic)
-{
- struct vga_switcheroo_client *client;
-
- mutex_lock(&vgasr_mutex);
- client = find_client_from_pci(&vgasr_priv.clients, pdev);
- if (!client || !client->driver_power_control) {
- mutex_unlock(&vgasr_mutex);
- return;
- }
-
- set_audio_state(client->id, dynamic);
- mutex_unlock(&vgasr_mutex);
-}
-EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch);
-
/* switcheroo power domain */
static int vga_switcheroo_runtime_suspend(struct device *dev)
{
@@ -1089,69 +1056,3 @@ void vga_switcheroo_fini_domain_pm_ops(struct device *dev)
dev_pm_domain_set(dev, NULL);
}
EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops);
-
-static int vga_switcheroo_runtime_resume_hdmi_audio(struct device *dev)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct vga_switcheroo_client *client;
- struct device *video_dev = NULL;
- int ret;
-
- /* we need to check if we have to switch back on the video
- * device so the audio device can come back
- */
- mutex_lock(&vgasr_mutex);
- list_for_each_entry(client, &vgasr_priv.clients, list) {
- if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) &&
- client_is_vga(client)) {
- video_dev = &client->pdev->dev;
- break;
- }
- }
- mutex_unlock(&vgasr_mutex);
-
- if (video_dev) {
- ret = pm_runtime_get_sync(video_dev);
- if (ret && ret != 1)
- return ret;
- }
- ret = dev->bus->pm->runtime_resume(dev);
-
- /* put the reference for the gpu */
- if (video_dev) {
- pm_runtime_mark_last_busy(video_dev);
- pm_runtime_put_autosuspend(video_dev);
- }
- return ret;
-}
-
-/**
- * vga_switcheroo_init_domain_pm_optimus_hdmi_audio() - helper for driver
- * power control
- * @dev: audio client device
- * @domain: power domain
- *
- * Helper for GPUs whose power state is controlled by the driver's runtime pm.
- * When the audio device resumes, the GPU needs to be woken. This helper
- * augments the audio device's resume function to do that.
- *
- * Return: 0 on success, -EINVAL if no power management operations are
- * defined for this device.
- */
-int
-vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev,
- struct dev_pm_domain *domain)
-{
- /* copy over all the bus versions */
- if (dev->bus && dev->bus->pm) {
- domain->ops = *dev->bus->pm;
- domain->ops.runtime_resume =
- vga_switcheroo_runtime_resume_hdmi_audio;
-
- dev_pm_domain_set(dev, domain);
- return 0;
- }
- dev_pm_domain_set(dev, NULL);
- return -EINVAL;
-}
-EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio);