[PATCH v7 0/6] drm/i915: Convert fbdev to DRM client

[PATCH v7 0/6] drm/i915: Convert fbdev to DRM client

[Thomas Zimmermann]

Convert i915's fbdev code to struct drm_client. Replaces the current
ad-hoc integration. The conversion includes a number of cleanups. The
patchset also enables unloading of driver modules with in-kernel DRM
clients; a feature required by i915. Also update the xe driver where
necessary.

As with the other drivers' fbdev emulation, fbdev in i915 is now
an in-kernel DRM client that runs after the DRM device has been
registered. This allows to remove the asynchronous initialization.

i915 is the last driver with an fbdev emulation that is not build
upon struct drm_client. Once reviewed, the patches would ideally go
into drm-misc-next, so that the old fbdev helper code can be removed.
We can also attempt to add additional in-kernel clients. A DRM-based
dmesg log or a bootsplash are commonly mentioned. DRM can then switch
easily among the existing clients if/when required.

v7:
	* update xe driver
v6:
	* reorder patches to fix build (Jouni)
	* remove unnecessary handling of non-atomic commits (Jouni, Ville)
	* return errors from callbacks (Jouni)
	* various minor fixes
v5:
	* style fixes (checkpatch)
v4:
	<no changes>
v3:
	* support module unloading (Jani, CI bot)
	* as before, silently ignore devices without displays (CI  bot)
v2:
	* fix error handling (Jani)
	* fix non-fbdev builds
	* various minor fixes and cleanups

Thomas Zimmermann (6):
  drm/client: Export drm_client_dev_unregister()
  drm/i915: Unregister in-kernel clients
  drm/i915: Move fbdev functions
  drm/i915: Initialize fbdev DRM client with callback functions
  drm/i915: Implement fbdev client callbacks
  drm/i915: Implement fbdev emulation as in-kernel client

 drivers/gpu/drm/drm_client.c                  |  13 +
 drivers/gpu/drm/i915/display/intel_display.c  |   1 -
 .../drm/i915/display/intel_display_driver.c   |  19 --
 drivers/gpu/drm/i915/display/intel_fbdev.c    | 265 ++++++++++--------
 drivers/gpu/drm/i915/display/intel_fbdev.h    |  29 +-
 drivers/gpu/drm/i915/i915_driver.c            |  27 +-
 drivers/gpu/drm/xe/display/xe_display.c       |  11 -
 drivers/gpu/drm/xe/xe_device.c                |   3 +
 8 files changed, 169 insertions(+), 199 deletions(-)

-- 
2.43.2

[PATCH v7 1/6] drm/client: Export drm_client_dev_unregister()

[Thomas Zimmermann]

Export drm_client_dev_unregister() for use by the i915 driver. The
driver does not use drm_dev_unregister(), so it has to clean up the
in-kernel DRM clients by itself.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/drm_client.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 9403b3f576f7b..3d4f8b77d0789 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -172,6 +172,18 @@ void drm_client_release(struct drm_client_dev *client)
 }
 EXPORT_SYMBOL(drm_client_release);
 
+/**
+ * drm_client_dev_unregister - Unregister clients
+ * @dev: DRM device
+ *
+ * This function releases all clients by calling each client's
+ * &drm_client_funcs.unregister callback. The callback function
+ * is responsibe for releaseing all resources including the client
+ * itself.
+ *
+ * The helper drm_dev_unregister() calls this function. Drivers
+ * that use it don't need to call this function themselves.
+ */
 void drm_client_dev_unregister(struct drm_device *dev)
 {
 	struct drm_client_dev *client, *tmp;
@@ -191,6 +203,7 @@ void drm_client_dev_unregister(struct drm_device *dev)
 	}
 	mutex_unlock(&dev->clientlist_mutex);
 }
+EXPORT_SYMBOL(drm_client_dev_unregister);
 
 /**
  * drm_client_dev_hotplug - Send hotplug event to clients
-- 
2.43.2

Re: [PATCH v7 1/6] drm/client: Export drm_client_dev_unregister()

[Rodrigo Vivi]

On Fri, Mar 01, 2024 at 02:42:54PM +0100, Thomas Zimmermann wrote:
> Export drm_client_dev_unregister() for use by the i915 driver. The
> driver does not use drm_dev_unregister(),

Perhaps we should make i915 to call for the drm_dev_unregister since it calls
for drm_dev_register?

> so it has to clean up the
> in-kernel DRM clients by itself.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  drivers/gpu/drm/drm_client.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
> index 9403b3f576f7b..3d4f8b77d0789 100644
> --- a/drivers/gpu/drm/drm_client.c
> +++ b/drivers/gpu/drm/drm_client.c
> @@ -172,6 +172,18 @@ void drm_client_release(struct drm_client_dev *client)
>  }
>  EXPORT_SYMBOL(drm_client_release);
>  
> +/**
> + * drm_client_dev_unregister - Unregister clients
> + * @dev: DRM device
> + *
> + * This function releases all clients by calling each client's
> + * &drm_client_funcs.unregister callback. The callback function
> + * is responsibe for releaseing all resources including the client
> + * itself.
> + *
> + * The helper drm_dev_unregister() calls this function. Drivers
> + * that use it don't need to call this function themselves.
> + */
>  void drm_client_dev_unregister(struct drm_device *dev)
>  {
>  	struct drm_client_dev *client, *tmp;
> @@ -191,6 +203,7 @@ void drm_client_dev_unregister(struct drm_device *dev)
>  	}
>  	mutex_unlock(&dev->clientlist_mutex);
>  }
> +EXPORT_SYMBOL(drm_client_dev_unregister);
>  
>  /**
>   * drm_client_dev_hotplug - Send hotplug event to clients
> -- 
> 2.43.2
> 

Re: [PATCH v7 1/6] drm/client: Export drm_client_dev_unregister()

[Thomas Zimmermann]

Hi

Am 08.03.24 um 16:49 schrieb Rodrigo Vivi:
> On Fri, Mar 01, 2024 at 02:42:54PM +0100, Thomas Zimmermann wrote:
>> Export drm_client_dev_unregister() for use by the i915 driver. The
>> driver does not use drm_dev_unregister(),
> Perhaps we should make i915 to call for the drm_dev_unregister since it calls
> for drm_dev_register?

Not that I disagree, but this appears to be a separate change unrelated 
to fbdev support.

Best regards
Thomas

>
>> so it has to clean up the
>> in-kernel DRM clients by itself.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> ---
>>   drivers/gpu/drm/drm_client.c | 13 +++++++++++++
>>   1 file changed, 13 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
>> index 9403b3f576f7b..3d4f8b77d0789 100644
>> --- a/drivers/gpu/drm/drm_client.c
>> +++ b/drivers/gpu/drm/drm_client.c
>> @@ -172,6 +172,18 @@ void drm_client_release(struct drm_client_dev *client)
>>   }
>>   EXPORT_SYMBOL(drm_client_release);
>>   
>> +/**
>> + * drm_client_dev_unregister - Unregister clients
>> + * @dev: DRM device
>> + *
>> + * This function releases all clients by calling each client's
>> + * &drm_client_funcs.unregister callback. The callback function
>> + * is responsibe for releaseing all resources including the client
>> + * itself.
>> + *
>> + * The helper drm_dev_unregister() calls this function. Drivers
>> + * that use it don't need to call this function themselves.
>> + */
>>   void drm_client_dev_unregister(struct drm_device *dev)
>>   {
>>   	struct drm_client_dev *client, *tmp;
>> @@ -191,6 +203,7 @@ void drm_client_dev_unregister(struct drm_device *dev)
>>   	}
>>   	mutex_unlock(&dev->clientlist_mutex);
>>   }
>> +EXPORT_SYMBOL(drm_client_dev_unregister);
>>   
>>   /**
>>    * drm_client_dev_hotplug - Send hotplug event to clients
>> -- 
>> 2.43.2
>>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

[PATCH v7 2/6] drm/i915: Unregister in-kernel clients

[Thomas Zimmermann]

Unregister all in-kernel clients before unloading the i915 driver. For
other drivers, drm_dev_unregister() does this automatically. As i915
does not use this helper, it has to perform the call by itself. For xe,
do the same in xe_device_remove()

Note that there are currently no in-kernel clients in i915 or xe. The
patch prepares the drivers for a related update of their fbdev support.

v7:
	* update xe driver

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/i915/i915_driver.c | 3 +++
 drivers/gpu/drm/xe/xe_device.c     | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index 9ee902d5b72c4..97910a85e3917 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -41,6 +41,7 @@
 
 #include <drm/drm_aperture.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_client.h>
 #include <drm/drm_ioctl.h>
 #include <drm/drm_managed.h>
 #include <drm/drm_probe_helper.h>
@@ -852,6 +853,8 @@ void i915_driver_remove(struct drm_i915_private *i915)
 {
 	intel_wakeref_t wakeref;
 
+	drm_client_dev_unregister(&i915->drm);
+
 	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
 
 	i915_driver_unregister(i915);
diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index 919ad88f0495a..7f41f0ec819f0 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -9,6 +9,7 @@
 
 #include <drm/drm_aperture.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_client.h>
 #include <drm/drm_gem_ttm_helper.h>
 #include <drm/drm_ioctl.h>
 #include <drm/drm_managed.h>
@@ -614,6 +615,8 @@ void xe_device_remove(struct xe_device *xe)
 	struct xe_gt *gt;
 	u8 id;
 
+	drm_client_dev_unregister(&xe->drm);
+
 	xe_device_remove_display(xe);
 
 	xe_display_fini(xe);
-- 
2.43.2

Re: [PATCH v7 2/6] drm/i915: Unregister in-kernel clients

[Rodrigo Vivi]

On Fri, Mar 01, 2024 at 02:42:55PM +0100, Thomas Zimmermann wrote:
> Unregister all in-kernel clients before unloading the i915 driver. For
> other drivers, drm_dev_unregister() does this automatically. As i915
> does not use this helper, it has to perform the call by itself. For xe,
> do the same in xe_device_remove()
> 
> Note that there are currently no in-kernel clients in i915 or xe. The
> patch prepares the drivers for a related update of their fbdev support.
> 
> v7:
> 	* update xe driver
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  drivers/gpu/drm/i915/i915_driver.c | 3 +++
>  drivers/gpu/drm/xe/xe_device.c     | 3 +++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> index 9ee902d5b72c4..97910a85e3917 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -41,6 +41,7 @@
>  
>  #include <drm/drm_aperture.h>
>  #include <drm/drm_atomic_helper.h>
> +#include <drm/drm_client.h>
>  #include <drm/drm_ioctl.h>
>  #include <drm/drm_managed.h>
>  #include <drm/drm_probe_helper.h>
> @@ -852,6 +853,8 @@ void i915_driver_remove(struct drm_i915_private *i915)
>  {
>  	intel_wakeref_t wakeref;
>  
> +	drm_client_dev_unregister(&i915->drm);
> +
>  	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
>  
>  	i915_driver_unregister(i915);
> diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
> index 919ad88f0495a..7f41f0ec819f0 100644
> --- a/drivers/gpu/drm/xe/xe_device.c
> +++ b/drivers/gpu/drm/xe/xe_device.c

probably deserves a separate patch since this is one here is named 'drm/i915:'

> @@ -9,6 +9,7 @@
>  
>  #include <drm/drm_aperture.h>
>  #include <drm/drm_atomic_helper.h>
> +#include <drm/drm_client.h>
>  #include <drm/drm_gem_ttm_helper.h>
>  #include <drm/drm_ioctl.h>
>  #include <drm/drm_managed.h>
> @@ -614,6 +615,8 @@ void xe_device_remove(struct xe_device *xe)
>  	struct xe_gt *gt;
>  	u8 id;
>  
> +	drm_client_dev_unregister(&xe->drm);
> +
>  	xe_device_remove_display(xe);
>  
>  	xe_display_fini(xe);
> -- 
> 2.43.2
> 

Re: [PATCH v7 2/6] drm/i915: Unregister in-kernel clients

[Jani Nikula]

On Tue, 05 Mar 2024, Rodrigo Vivi <rodrigo.vivi@intel.com> wrote:
> On Fri, Mar 01, 2024 at 02:42:55PM +0100, Thomas Zimmermann wrote:
>> Unregister all in-kernel clients before unloading the i915 driver. For
>> other drivers, drm_dev_unregister() does this automatically. As i915
>> does not use this helper, it has to perform the call by itself. For xe,
>> do the same in xe_device_remove()
>> 
>> Note that there are currently no in-kernel clients in i915 or xe. The
>> patch prepares the drivers for a related update of their fbdev support.
>> 
>> v7:
>> 	* update xe driver
>> 
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> ---
>>  drivers/gpu/drm/i915/i915_driver.c | 3 +++
>>  drivers/gpu/drm/xe/xe_device.c     | 3 +++
>>  2 files changed, 6 insertions(+)
>> 
>> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
>> index 9ee902d5b72c4..97910a85e3917 100644
>> --- a/drivers/gpu/drm/i915/i915_driver.c
>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>> @@ -41,6 +41,7 @@
>>  
>>  #include <drm/drm_aperture.h>
>>  #include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_client.h>
>>  #include <drm/drm_ioctl.h>
>>  #include <drm/drm_managed.h>
>>  #include <drm/drm_probe_helper.h>
>> @@ -852,6 +853,8 @@ void i915_driver_remove(struct drm_i915_private *i915)
>>  {
>>  	intel_wakeref_t wakeref;
>>  
>> +	drm_client_dev_unregister(&i915->drm);
>> +
>>  	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
>>  
>>  	i915_driver_unregister(i915);
>> diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
>> index 919ad88f0495a..7f41f0ec819f0 100644
>> --- a/drivers/gpu/drm/xe/xe_device.c
>> +++ b/drivers/gpu/drm/xe/xe_device.c
>
> probably deserves a separate patch since this is one here is named 'drm/i915:'

Or do this for both in intel_display_driver_unregister()?

BR,
Jani.


>
>> @@ -9,6 +9,7 @@
>>  
>>  #include <drm/drm_aperture.h>
>>  #include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_client.h>
>>  #include <drm/drm_gem_ttm_helper.h>
>>  #include <drm/drm_ioctl.h>
>>  #include <drm/drm_managed.h>
>> @@ -614,6 +615,8 @@ void xe_device_remove(struct xe_device *xe)
>>  	struct xe_gt *gt;
>>  	u8 id;
>>  
>> +	drm_client_dev_unregister(&xe->drm);
>> +
>>  	xe_device_remove_display(xe);
>>  
>>  	xe_display_fini(xe);
>> -- 
>> 2.43.2
>> 

-- 
Jani Nikula, Intel

Re: [PATCH v7 2/6] drm/i915: Unregister in-kernel clients

[Thomas Zimmermann]

Hi

Am 05.03.24 um 17:25 schrieb Jani Nikula:
> On Tue, 05 Mar 2024, Rodrigo Vivi <rodrigo.vivi@intel.com> wrote:
>> On Fri, Mar 01, 2024 at 02:42:55PM +0100, Thomas Zimmermann wrote:
>>> Unregister all in-kernel clients before unloading the i915 driver. For
>>> other drivers, drm_dev_unregister() does this automatically. As i915
>>> does not use this helper, it has to perform the call by itself. For xe,
>>> do the same in xe_device_remove()
>>>
>>> Note that there are currently no in-kernel clients in i915 or xe. The
>>> patch prepares the drivers for a related update of their fbdev support.
>>>
>>> v7:
>>> 	* update xe driver
>>>
>>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>>> ---
>>>   drivers/gpu/drm/i915/i915_driver.c | 3 +++
>>>   drivers/gpu/drm/xe/xe_device.c     | 3 +++
>>>   2 files changed, 6 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
>>> index 9ee902d5b72c4..97910a85e3917 100644
>>> --- a/drivers/gpu/drm/i915/i915_driver.c
>>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>>> @@ -41,6 +41,7 @@
>>>   
>>>   #include <drm/drm_aperture.h>
>>>   #include <drm/drm_atomic_helper.h>
>>> +#include <drm/drm_client.h>
>>>   #include <drm/drm_ioctl.h>
>>>   #include <drm/drm_managed.h>
>>>   #include <drm/drm_probe_helper.h>
>>> @@ -852,6 +853,8 @@ void i915_driver_remove(struct drm_i915_private *i915)
>>>   {
>>>   	intel_wakeref_t wakeref;
>>>   
>>> +	drm_client_dev_unregister(&i915->drm);
>>> +
>>>   	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
>>>   
>>>   	i915_driver_unregister(i915);
>>> diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
>>> index 919ad88f0495a..7f41f0ec819f0 100644
>>> --- a/drivers/gpu/drm/xe/xe_device.c
>>> +++ b/drivers/gpu/drm/xe/xe_device.c
>> probably deserves a separate patch since this is one here is named 'drm/i915:'
> Or do this for both in intel_display_driver_unregister()?

Ok, sure. I'll update this. I also have to update i915 and xe in patches 
5 and 6. I don't see how I can change them individually. How would I 
best log against both of them? drm/{i915,xe}? or drm/intel?

Best regards
Thomas

>
> BR,
> Jani.
>
>
>>> @@ -9,6 +9,7 @@
>>>   
>>>   #include <drm/drm_aperture.h>
>>>   #include <drm/drm_atomic_helper.h>
>>> +#include <drm/drm_client.h>
>>>   #include <drm/drm_gem_ttm_helper.h>
>>>   #include <drm/drm_ioctl.h>
>>>   #include <drm/drm_managed.h>
>>> @@ -614,6 +615,8 @@ void xe_device_remove(struct xe_device *xe)
>>>   	struct xe_gt *gt;
>>>   	u8 id;
>>>   
>>> +	drm_client_dev_unregister(&xe->drm);
>>> +
>>>   	xe_device_remove_display(xe);
>>>   
>>>   	xe_display_fini(xe);
>>> -- 
>>> 2.43.2
>>>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH v7 2/6] drm/i915: Unregister in-kernel clients

[Rodrigo Vivi]

On Wed, Mar 06, 2024 at 04:11:54PM +0100, Thomas Zimmermann wrote:
> Hi
> 
> Am 05.03.24 um 17:25 schrieb Jani Nikula:
> > On Tue, 05 Mar 2024, Rodrigo Vivi <rodrigo.vivi@intel.com> wrote:
> > > On Fri, Mar 01, 2024 at 02:42:55PM +0100, Thomas Zimmermann wrote:
> > > > Unregister all in-kernel clients before unloading the i915 driver. For
> > > > other drivers, drm_dev_unregister() does this automatically. As i915
> > > > does not use this helper, it has to perform the call by itself. For xe,
> > > > do the same in xe_device_remove()
> > > > 
> > > > Note that there are currently no in-kernel clients in i915 or xe. The
> > > > patch prepares the drivers for a related update of their fbdev support.
> > > > 
> > > > v7:
> > > > 	* update xe driver
> > > > 
> > > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> > > > ---
> > > >   drivers/gpu/drm/i915/i915_driver.c | 3 +++
> > > >   drivers/gpu/drm/xe/xe_device.c     | 3 +++
> > > >   2 files changed, 6 insertions(+)
> > > > 
> > > > diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> > > > index 9ee902d5b72c4..97910a85e3917 100644
> > > > --- a/drivers/gpu/drm/i915/i915_driver.c
> > > > +++ b/drivers/gpu/drm/i915/i915_driver.c
> > > > @@ -41,6 +41,7 @@
> > > >   #include <drm/drm_aperture.h>
> > > >   #include <drm/drm_atomic_helper.h>
> > > > +#include <drm/drm_client.h>
> > > >   #include <drm/drm_ioctl.h>
> > > >   #include <drm/drm_managed.h>
> > > >   #include <drm/drm_probe_helper.h>
> > > > @@ -852,6 +853,8 @@ void i915_driver_remove(struct drm_i915_private *i915)
> > > >   {
> > > >   	intel_wakeref_t wakeref;
> > > > +	drm_client_dev_unregister(&i915->drm);
> > > > +
> > > >   	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
> > > >   	i915_driver_unregister(i915);
> > > > diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
> > > > index 919ad88f0495a..7f41f0ec819f0 100644
> > > > --- a/drivers/gpu/drm/xe/xe_device.c
> > > > +++ b/drivers/gpu/drm/xe/xe_device.c
> > > probably deserves a separate patch since this is one here is named 'drm/i915:'
> > Or do this for both in intel_display_driver_unregister()?
> 
> Ok, sure. I'll update this. I also have to update i915 and xe in patches 5
> and 6. I don't see how I can change them individually. How would I best log
> against both of them? drm/{i915,xe}? or drm/intel?

hmmm... though one...

drm-intel is the name of the i915 repository

well, perhaps drm/{i915,xe} works
or maybe just drm/i915/display: because since display is shared, that
kind of "tag" would be an indication that xe needs it as well anyway.

> 
> Best regards
> Thomas
> 
> > 
> > BR,
> > Jani.
> > 
> > 
> > > > @@ -9,6 +9,7 @@
> > > >   #include <drm/drm_aperture.h>
> > > >   #include <drm/drm_atomic_helper.h>
> > > > +#include <drm/drm_client.h>
> > > >   #include <drm/drm_gem_ttm_helper.h>
> > > >   #include <drm/drm_ioctl.h>
> > > >   #include <drm/drm_managed.h>
> > > > @@ -614,6 +615,8 @@ void xe_device_remove(struct xe_device *xe)
> > > >   	struct xe_gt *gt;
> > > >   	u8 id;
> > > > +	drm_client_dev_unregister(&xe->drm);
> > > > +
> > > >   	xe_device_remove_display(xe);
> > > >   	xe_display_fini(xe);
> > > > -- 
> > > > 2.43.2
> > > > 
> 
> -- 
> --
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Frankenstrasse 146, 90461 Nuernberg, Germany
> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> HRB 36809 (AG Nuernberg)
> 

[PATCH v7 3/6] drm/i915: Move fbdev functions

[Thomas Zimmermann]

Move functions within intel_fbdev.c to simplify later updates. Minor
style fixes to make checkpatch happy, but no functional changes.

v5:
	* style fixes (checkpatch)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbdev.c | 154 ++++++++++-----------
 1 file changed, 77 insertions(+), 77 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 99894a855ef05..76c0e89bf25e8 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -453,58 +453,6 @@ static void intel_fbdev_suspend_worker(struct work_struct *work)
 				true);
 }
 
-int intel_fbdev_init(struct drm_device *dev)
-{
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_fbdev *ifbdev;
-	int ret;
-
-	if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
-		return -ENODEV;
-
-	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
-	if (ifbdev == NULL)
-		return -ENOMEM;
-
-	mutex_init(&ifbdev->hpd_lock);
-	drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
-
-	if (intel_fbdev_init_bios(dev, ifbdev))
-		ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
-	else
-		ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
-
-	ret = drm_fb_helper_init(dev, &ifbdev->helper);
-	if (ret) {
-		kfree(ifbdev);
-		return ret;
-	}
-
-	dev_priv->display.fbdev.fbdev = ifbdev;
-	INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
-
-	return 0;
-}
-
-static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
-{
-	struct intel_fbdev *ifbdev = data;
-
-	/* Due to peculiar init order wrt to hpd handling this is separate. */
-	if (drm_fb_helper_initial_config(&ifbdev->helper))
-		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
-}
-
-void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
-{
-	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
-	if (!ifbdev)
-		return;
-
-	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
-}
-
 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 {
 	if (!ifbdev->cookie)
@@ -515,31 +463,6 @@ static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 	ifbdev->cookie = 0;
 }
 
-void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
-{
-	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
-	if (!ifbdev)
-		return;
-
-	intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
-
-	if (!current_is_async())
-		intel_fbdev_sync(ifbdev);
-
-	drm_fb_helper_unregister_info(&ifbdev->helper);
-}
-
-void intel_fbdev_fini(struct drm_i915_private *dev_priv)
-{
-	struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
-
-	if (!ifbdev)
-		return;
-
-	intel_fbdev_destroy(ifbdev);
-}
-
 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
  * processing, fbdev will perform a full connector reprobe if a hotplug event
  * was received while HPD was suspended.
@@ -656,6 +579,83 @@ void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 		intel_fbdev_invalidate(ifbdev);
 }
 
+int intel_fbdev_init(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_fbdev *ifbdev;
+	int ret;
+
+	if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
+		return -ENODEV;
+
+	ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
+	if (!ifbdev)
+		return -ENOMEM;
+
+	mutex_init(&ifbdev->hpd_lock);
+	drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
+
+	if (intel_fbdev_init_bios(dev, ifbdev))
+		ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
+	else
+		ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
+
+	ret = drm_fb_helper_init(dev, &ifbdev->helper);
+	if (ret) {
+		kfree(ifbdev);
+		return ret;
+	}
+
+	dev_priv->display.fbdev.fbdev = ifbdev;
+	INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
+
+	return 0;
+}
+
+static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
+{
+	struct intel_fbdev *ifbdev = data;
+
+	/* Due to peculiar init order wrt to hpd handling this is separate. */
+	if (drm_fb_helper_initial_config(&ifbdev->helper))
+		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
+}
+
+void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
+{
+	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
+
+	if (!ifbdev)
+		return;
+
+	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
+}
+
+void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
+{
+	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
+
+	if (!ifbdev)
+		return;
+
+	intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
+
+	if (!current_is_async())
+		intel_fbdev_sync(ifbdev);
+
+	drm_fb_helper_unregister_info(&ifbdev->helper);
+}
+
+void intel_fbdev_fini(struct drm_i915_private *dev_priv)
+{
+	struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
+
+	if (!ifbdev)
+		return;
+
+	intel_fbdev_destroy(ifbdev);
+}
+
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 {
 	if (!fbdev || !fbdev->helper.fb)
-- 
2.43.2

[PATCH v7 4/6] drm/i915: Initialize fbdev DRM client with callback functions

[Thomas Zimmermann]

Initialize i915's fbdev client by giving an instance of struct
drm_client_funcs to drm_client_init(). Also clean up with
drm_client_release().

Doing this in i915 prevents fbdev helpers from initializing and
releasing the client internally (see drm_fb_helper_init()). No
functional change yet; the client callbacks will be filled later.

v6:
	* rename client to "intel-fbdev" (Jouni)
v2:
	* call drm_fb_helper_unprepare() in error handling (Jani)
	* fix typo in commit message (Sam)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/i915/display/intel_fbdev.c | 43 ++++++++++++++++++++--
 1 file changed, 39 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 76c0e89bf25e8..32aeb5faf706b 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -286,6 +286,7 @@ static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 	if (ifbdev->fb)
 		drm_framebuffer_remove(&ifbdev->fb->base);
 
+	drm_client_release(&ifbdev->helper.client);
 	drm_fb_helper_unprepare(&ifbdev->helper);
 	kfree(ifbdev);
 }
@@ -579,6 +580,30 @@ void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 		intel_fbdev_invalidate(ifbdev);
 }
 
+/*
+ * Fbdev client and struct drm_client_funcs
+ */
+
+static void intel_fbdev_client_unregister(struct drm_client_dev *client)
+{ }
+
+static int intel_fbdev_client_restore(struct drm_client_dev *client)
+{
+	return 0;
+}
+
+static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
+{
+	return 0;
+}
+
+static const struct drm_client_funcs intel_fbdev_client_funcs = {
+	.owner		= THIS_MODULE,
+	.unregister	= intel_fbdev_client_unregister,
+	.restore	= intel_fbdev_client_restore,
+	.hotplug	= intel_fbdev_client_hotplug,
+};
+
 int intel_fbdev_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -600,16 +625,26 @@ int intel_fbdev_init(struct drm_device *dev)
 	else
 		ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
 
+	ret = drm_client_init(dev, &ifbdev->helper.client, "intel-fbdev",
+			      &intel_fbdev_client_funcs);
+	if (ret)
+		goto err_drm_fb_helper_unprepare;
+
 	ret = drm_fb_helper_init(dev, &ifbdev->helper);
-	if (ret) {
-		kfree(ifbdev);
-		return ret;
-	}
+	if (ret)
+		goto err_drm_client_release;
 
 	dev_priv->display.fbdev.fbdev = ifbdev;
 	INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 
 	return 0;
+
+err_drm_client_release:
+	drm_client_release(&ifbdev->helper.client);
+err_drm_fb_helper_unprepare:
+	drm_fb_helper_unprepare(&ifbdev->helper);
+	kfree(ifbdev);
+	return ret;
 }
 
 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
-- 
2.43.2

Re: [PATCH v7 4/6] drm/i915: Initialize fbdev DRM client with callback functions

[Hogander, Jouni]

On Fri, 2024-03-01 at 14:42 +0100, Thomas Zimmermann wrote:
> Initialize i915's fbdev client by giving an instance of struct
> drm_client_funcs to drm_client_init(). Also clean up with
> drm_client_release().
> 
> Doing this in i915 prevents fbdev helpers from initializing and
> releasing the client internally (see drm_fb_helper_init()). No
> functional change yet; the client callbacks will be filled later.
> 
> v6:
>         * rename client to "intel-fbdev" (Jouni)
> v2:
>         * call drm_fb_helper_unprepare() in error handling (Jani)
>         * fix typo in commit message (Sam)
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_fbdev.c | 43
> ++++++++++++++++++++--
>  1 file changed, 39 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c
> b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 76c0e89bf25e8..32aeb5faf706b 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -286,6 +286,7 @@ static void intel_fbdev_destroy(struct
> intel_fbdev *ifbdev)
>         if (ifbdev->fb)
>                 drm_framebuffer_remove(&ifbdev->fb->base);
>  
> +       drm_client_release(&ifbdev->helper.client);
>         drm_fb_helper_unprepare(&ifbdev->helper);
>         kfree(ifbdev);
>  }
> @@ -579,6 +580,30 @@ void intel_fbdev_restore_mode(struct
> drm_i915_private *dev_priv)
>                 intel_fbdev_invalidate(ifbdev);
>  }
>  
> +/*
> + * Fbdev client and struct drm_client_funcs
> + */
> +
> +static void intel_fbdev_client_unregister(struct drm_client_dev
> *client)
> +{ }
> +
> +static int intel_fbdev_client_restore(struct drm_client_dev *client)
> +{
> +       return 0;
> +}
> +
> +static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
> +{
> +       return 0;
> +}
> +
> +static const struct drm_client_funcs intel_fbdev_client_funcs = {
> +       .owner          = THIS_MODULE,
> +       .unregister     = intel_fbdev_client_unregister,
> +       .restore        = intel_fbdev_client_restore,
> +       .hotplug        = intel_fbdev_client_hotplug,
> +};
> +
>  int intel_fbdev_init(struct drm_device *dev)
>  {
>         struct drm_i915_private *dev_priv = to_i915(dev);
> @@ -600,16 +625,26 @@ int intel_fbdev_init(struct drm_device *dev)
>         else
>                 ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
>  
> +       ret = drm_client_init(dev, &ifbdev->helper.client, "intel-
> fbdev",
> +                             &intel_fbdev_client_funcs);
> +       if (ret)
> +               goto err_drm_fb_helper_unprepare;
> +
>         ret = drm_fb_helper_init(dev, &ifbdev->helper);
> -       if (ret) {
> -               kfree(ifbdev);
> -               return ret;
> -       }
> +       if (ret)
> +               goto err_drm_client_release;
>  
>         dev_priv->display.fbdev.fbdev = ifbdev;
>         INIT_WORK(&dev_priv->display.fbdev.suspend_work,
> intel_fbdev_suspend_worker);
>  
>         return 0;
> +
> +err_drm_client_release:
> +       drm_client_release(&ifbdev->helper.client);
> +err_drm_fb_helper_unprepare:
> +       drm_fb_helper_unprepare(&ifbdev->helper);
> +       kfree(ifbdev);
> +       return ret;
>  }
>  
>  static void intel_fbdev_initial_config(void *data, async_cookie_t
> cookie)

[PATCH v7 5/6] drm/i915: Implement fbdev client callbacks

[Thomas Zimmermann]

Move code from ad-hoc fbdev callbacks into DRM client functions
and remove the old callbacks. The functions instruct the client
to poll for changed output or restore the display.

The DRM core calls both, the old callbacks and the new client
helpers, from the same places. The new functions perform the same
operation as before, so there's no change in functionality.

Fox xe, remove xe_display_last_close(), which restored the fbdev
display. As with i915, the DRM core's drm_lastclose() performs
this operation automatically.

v7:
	* update xe driver
v6:
	* return errors from client callbacks (Jouni)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 .../drm/i915/display/intel_display_driver.c   |  1 -
 drivers/gpu/drm/i915/display/intel_fbdev.c    | 33 ++++++++++++++-----
 drivers/gpu/drm/i915/display/intel_fbdev.h    |  9 -----
 drivers/gpu/drm/i915/i915_driver.c            | 22 -------------
 drivers/gpu/drm/xe/display/xe_display.c       |  9 -----
 5 files changed, 25 insertions(+), 49 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
index 87dd07e0d138d..ca92c48fbdc49 100644
--- a/drivers/gpu/drm/i915/display/intel_display_driver.c
+++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
@@ -98,7 +98,6 @@ void intel_display_driver_init_hw(struct drm_i915_private *i915)
 static const struct drm_mode_config_funcs intel_mode_funcs = {
 	.fb_create = intel_user_framebuffer_create,
 	.get_format_info = intel_fb_get_format_info,
-	.output_poll_changed = intel_fbdev_output_poll_changed,
 	.mode_valid = intel_mode_valid,
 	.atomic_check = intel_atomic_check,
 	.atomic_commit = intel_atomic_commit,
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 32aeb5faf706b..938ee709813df 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -546,13 +546,13 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous
 	intel_fbdev_hpd_set_suspend(dev_priv, state);
 }
 
-void intel_fbdev_output_poll_changed(struct drm_device *dev)
+static int intel_fbdev_output_poll_changed(struct drm_device *dev)
 {
 	struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 	bool send_hpd;
 
 	if (!ifbdev)
-		return;
+		return -EINVAL;
 
 	intel_fbdev_sync(ifbdev);
 
@@ -563,21 +563,29 @@ void intel_fbdev_output_poll_changed(struct drm_device *dev)
 
 	if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 		drm_fb_helper_hotplug_event(&ifbdev->helper);
+
+	return 0;
 }
 
-void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
+static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 {
 	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
+	int ret;
 
 	if (!ifbdev)
-		return;
+		return -EINVAL;
 
 	intel_fbdev_sync(ifbdev);
 	if (!ifbdev->vma)
-		return;
+		return -ENOMEM;
 
-	if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
-		intel_fbdev_invalidate(ifbdev);
+	ret = drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper);
+	if (ret)
+		return ret;
+
+	intel_fbdev_invalidate(ifbdev);
+
+	return 0;
 }
 
 /*
@@ -589,12 +597,21 @@ static void intel_fbdev_client_unregister(struct drm_client_dev *client)
 
 static int intel_fbdev_client_restore(struct drm_client_dev *client)
 {
+	struct drm_i915_private *dev_priv = to_i915(client->dev);
+	int ret;
+
+	ret = intel_fbdev_restore_mode(dev_priv);
+	if (ret)
+		return ret;
+
+	vga_switcheroo_process_delayed_switch();
+
 	return 0;
 }
 
 static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
 {
-	return 0;
+	return intel_fbdev_output_poll_changed(client->dev);
 }
 
 static const struct drm_client_funcs intel_fbdev_client_funcs = {
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h b/drivers/gpu/drm/i915/display/intel_fbdev.h
index 04fd523a50232..8c953f102ba22 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.h
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.h
@@ -19,8 +19,6 @@ void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv);
 void intel_fbdev_unregister(struct drm_i915_private *dev_priv);
 void intel_fbdev_fini(struct drm_i915_private *dev_priv);
 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous);
-void intel_fbdev_output_poll_changed(struct drm_device *dev);
-void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv);
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev);
 #else
 static inline int intel_fbdev_init(struct drm_device *dev)
@@ -44,13 +42,6 @@ static inline void intel_fbdev_set_suspend(struct drm_device *dev, int state, bo
 {
 }
 
-static inline void intel_fbdev_output_poll_changed(struct drm_device *dev)
-{
-}
-
-static inline void intel_fbdev_restore_mode(struct drm_i915_private *i915)
-{
-}
 static inline struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 {
 	return NULL;
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index 97910a85e3917..e0f13c62a1832 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -923,27 +923,6 @@ static int i915_driver_open(struct drm_device *dev, struct drm_file *file)
 	return 0;
 }
 
-/**
- * i915_driver_lastclose - clean up after all DRM clients have exited
- * @dev: DRM device
- *
- * Take care of cleaning up after all DRM clients have exited.  In the
- * mode setting case, we want to restore the kernel's initial mode (just
- * in case the last client left us in a bad state).
- *
- * Additionally, in the non-mode setting case, we'll tear down the GTT
- * and DMA structures, since the kernel won't be using them, and clea
- * up any GEM state.
- */
-static void i915_driver_lastclose(struct drm_device *dev)
-{
-	struct drm_i915_private *i915 = to_i915(dev);
-
-	intel_fbdev_restore_mode(i915);
-
-	vga_switcheroo_process_delayed_switch();
-}
-
 static void i915_driver_postclose(struct drm_device *dev, struct drm_file *file)
 {
 	struct drm_i915_file_private *file_priv = file->driver_priv;
@@ -1834,7 +1813,6 @@ static const struct drm_driver i915_drm_driver = {
 	    DRIVER_SYNCOBJ_TIMELINE,
 	.release = i915_driver_release,
 	.open = i915_driver_open,
-	.lastclose = i915_driver_lastclose,
 	.postclose = i915_driver_postclose,
 	.show_fdinfo = PTR_IF(IS_ENABLED(CONFIG_PROC_FS), i915_drm_client_fdinfo),
 
diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
index e4db069f0db3f..cdbc3f04c80a7 100644
--- a/drivers/gpu/drm/xe/display/xe_display.c
+++ b/drivers/gpu/drm/xe/display/xe_display.c
@@ -51,14 +51,6 @@ bool xe_display_driver_probe_defer(struct pci_dev *pdev)
 	return intel_display_driver_probe_defer(pdev);
 }
 
-static void xe_display_last_close(struct drm_device *dev)
-{
-	struct xe_device *xe = to_xe_device(dev);
-
-	if (xe->info.enable_display)
-		intel_fbdev_restore_mode(to_xe_device(dev));
-}
-
 /**
  * xe_display_driver_set_hooks - Add driver flags and hooks for display
  * @driver: DRM device driver
@@ -73,7 +65,6 @@ void xe_display_driver_set_hooks(struct drm_driver *driver)
 		return;
 
 	driver->driver_features |= DRIVER_MODESET | DRIVER_ATOMIC;
-	driver->lastclose = xe_display_last_close;
 }
 
 static void unset_display_features(struct xe_device *xe)
-- 
2.43.2

Re: [PATCH v7 5/6] drm/i915: Implement fbdev client callbacks

[Hogander, Jouni]

On Fri, 2024-03-01 at 14:42 +0100, Thomas Zimmermann wrote:
> Move code from ad-hoc fbdev callbacks into DRM client functions
> and remove the old callbacks. The functions instruct the client
> to poll for changed output or restore the display.
> 
> The DRM core calls both, the old callbacks and the new client
> helpers, from the same places. The new functions perform the same
> operation as before, so there's no change in functionality.
> 
> Fox xe, remove xe_display_last_close(), which restored the fbdev
> display. As with i915, the DRM core's drm_lastclose() performs
> this operation automatically.
> 
> v7:
>         * update xe driver
> v6:
>         * return errors from client callbacks (Jouni)
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

> ---
>  .../drm/i915/display/intel_display_driver.c   |  1 -
>  drivers/gpu/drm/i915/display/intel_fbdev.c    | 33 ++++++++++++++---
> --
>  drivers/gpu/drm/i915/display/intel_fbdev.h    |  9 -----
>  drivers/gpu/drm/i915/i915_driver.c            | 22 -------------
>  drivers/gpu/drm/xe/display/xe_display.c       |  9 -----
>  5 files changed, 25 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c
> b/drivers/gpu/drm/i915/display/intel_display_driver.c
> index 87dd07e0d138d..ca92c48fbdc49 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_driver.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
> @@ -98,7 +98,6 @@ void intel_display_driver_init_hw(struct
> drm_i915_private *i915)
>  static const struct drm_mode_config_funcs intel_mode_funcs = {
>         .fb_create = intel_user_framebuffer_create,
>         .get_format_info = intel_fb_get_format_info,
> -       .output_poll_changed = intel_fbdev_output_poll_changed,
>         .mode_valid = intel_mode_valid,
>         .atomic_check = intel_atomic_check,
>         .atomic_commit = intel_atomic_commit,
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c
> b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 32aeb5faf706b..938ee709813df 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -546,13 +546,13 @@ void intel_fbdev_set_suspend(struct drm_device
> *dev, int state, bool synchronous
>         intel_fbdev_hpd_set_suspend(dev_priv, state);
>  }
>  
> -void intel_fbdev_output_poll_changed(struct drm_device *dev)
> +static int intel_fbdev_output_poll_changed(struct drm_device *dev)
>  {
>         struct intel_fbdev *ifbdev = to_i915(dev)-
> >display.fbdev.fbdev;
>         bool send_hpd;
>  
>         if (!ifbdev)
> -               return;
> +               return -EINVAL;
>  
>         intel_fbdev_sync(ifbdev);
>  
> @@ -563,21 +563,29 @@ void intel_fbdev_output_poll_changed(struct
> drm_device *dev)
>  
>         if (send_hpd && (ifbdev->vma || ifbdev-
> >helper.deferred_setup))
>                 drm_fb_helper_hotplug_event(&ifbdev->helper);
> +
> +       return 0;
>  }
>  
> -void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
> +static int intel_fbdev_restore_mode(struct drm_i915_private
> *dev_priv)
>  {
>         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
> +       int ret;
>  
>         if (!ifbdev)
> -               return;
> +               return -EINVAL;
>  
>         intel_fbdev_sync(ifbdev);
>         if (!ifbdev->vma)
> -               return;
> +               return -ENOMEM;
>  
> -       if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev-
> >helper) == 0)
> -               intel_fbdev_invalidate(ifbdev);
> +       ret = drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev-
> >helper);
> +       if (ret)
> +               return ret;
> +
> +       intel_fbdev_invalidate(ifbdev);
> +
> +       return 0;
>  }
>  
>  /*
> @@ -589,12 +597,21 @@ static void
> intel_fbdev_client_unregister(struct drm_client_dev *client)
>  
>  static int intel_fbdev_client_restore(struct drm_client_dev *client)
>  {
> +       struct drm_i915_private *dev_priv = to_i915(client->dev);
> +       int ret;
> +
> +       ret = intel_fbdev_restore_mode(dev_priv);
> +       if (ret)
> +               return ret;
> +
> +       vga_switcheroo_process_delayed_switch();
> +
>         return 0;
>  }
>  
>  static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
>  {
> -       return 0;
> +       return intel_fbdev_output_poll_changed(client->dev);
>  }
>  
>  static const struct drm_client_funcs intel_fbdev_client_funcs = {
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h
> b/drivers/gpu/drm/i915/display/intel_fbdev.h
> index 04fd523a50232..8c953f102ba22 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.h
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.h
> @@ -19,8 +19,6 @@ void intel_fbdev_initial_config_async(struct
> drm_i915_private *dev_priv);
>  void intel_fbdev_unregister(struct drm_i915_private *dev_priv);
>  void intel_fbdev_fini(struct drm_i915_private *dev_priv);
>  void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool
> synchronous);
> -void intel_fbdev_output_poll_changed(struct drm_device *dev);
> -void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv);
>  struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev
> *fbdev);
>  #else
>  static inline int intel_fbdev_init(struct drm_device *dev)
> @@ -44,13 +42,6 @@ static inline void intel_fbdev_set_suspend(struct
> drm_device *dev, int state, bo
>  {
>  }
>  
> -static inline void intel_fbdev_output_poll_changed(struct drm_device
> *dev)
> -{
> -}
> -
> -static inline void intel_fbdev_restore_mode(struct drm_i915_private
> *i915)
> -{
> -}
>  static inline struct intel_framebuffer
> *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
>  {
>         return NULL;
> diff --git a/drivers/gpu/drm/i915/i915_driver.c
> b/drivers/gpu/drm/i915/i915_driver.c
> index 97910a85e3917..e0f13c62a1832 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -923,27 +923,6 @@ static int i915_driver_open(struct drm_device
> *dev, struct drm_file *file)
>         return 0;
>  }
>  
> -/**
> - * i915_driver_lastclose - clean up after all DRM clients have
> exited
> - * @dev: DRM device
> - *
> - * Take care of cleaning up after all DRM clients have exited.  In
> the
> - * mode setting case, we want to restore the kernel's initial mode
> (just
> - * in case the last client left us in a bad state).
> - *
> - * Additionally, in the non-mode setting case, we'll tear down the
> GTT
> - * and DMA structures, since the kernel won't be using them, and
> clea
> - * up any GEM state.
> - */
> -static void i915_driver_lastclose(struct drm_device *dev)
> -{
> -       struct drm_i915_private *i915 = to_i915(dev);
> -
> -       intel_fbdev_restore_mode(i915);
> -
> -       vga_switcheroo_process_delayed_switch();
> -}
> -
>  static void i915_driver_postclose(struct drm_device *dev, struct
> drm_file *file)
>  {
>         struct drm_i915_file_private *file_priv = file->driver_priv;
> @@ -1834,7 +1813,6 @@ static const struct drm_driver i915_drm_driver
> = {
>             DRIVER_SYNCOBJ_TIMELINE,
>         .release = i915_driver_release,
>         .open = i915_driver_open,
> -       .lastclose = i915_driver_lastclose,
>         .postclose = i915_driver_postclose,
>         .show_fdinfo = PTR_IF(IS_ENABLED(CONFIG_PROC_FS),
> i915_drm_client_fdinfo),
>  
> diff --git a/drivers/gpu/drm/xe/display/xe_display.c
> b/drivers/gpu/drm/xe/display/xe_display.c
> index e4db069f0db3f..cdbc3f04c80a7 100644
> --- a/drivers/gpu/drm/xe/display/xe_display.c
> +++ b/drivers/gpu/drm/xe/display/xe_display.c
> @@ -51,14 +51,6 @@ bool xe_display_driver_probe_defer(struct pci_dev
> *pdev)
>         return intel_display_driver_probe_defer(pdev);
>  }
>  
> -static void xe_display_last_close(struct drm_device *dev)
> -{
> -       struct xe_device *xe = to_xe_device(dev);
> -
> -       if (xe->info.enable_display)
> -               intel_fbdev_restore_mode(to_xe_device(dev));
> -}
> -
>  /**
>   * xe_display_driver_set_hooks - Add driver flags and hooks for
> display
>   * @driver: DRM device driver
> @@ -73,7 +65,6 @@ void xe_display_driver_set_hooks(struct drm_driver
> *driver)
>                 return;
>  
>         driver->driver_features |= DRIVER_MODESET | DRIVER_ATOMIC;
> -       driver->lastclose = xe_display_last_close;
>  }
>  
>  static void unset_display_features(struct xe_device *xe)

[PATCH v7 6/6] drm/i915: Implement fbdev emulation as in-kernel client

[Thomas Zimmermann]

Replace all code that initializes or releases fbdev emulation
throughout the driver. Instead initialize the fbdev client by a
single call to intel_fbdev_setup() after i915 has registered its
DRM device. Just like similar code in other drivers, i915 fbdev
emulation now acts like a regular DRM client.

The fbdev client setup consists of the initial preparation and the
hot-plugging of the display. The latter creates the fbdev device
and sets up the fbdev framebuffer. The setup performs display
hot-plugging once. If no display can be detected, DRM probe helpers
re-run the detection on each hotplug event.

A call to drm_client_dev_unregister() releases all in-kernel clients
automatically. No further action is required within i915. If the fbdev
framebuffer has been fully set up, struct fb_ops.fb_destroy implements
the release. For partially initialized emulation, the fbdev client
reverts the initial setup. Do the same for xe and remove its call to
intel_fbdev_fini().

v7:
	* update xe driver
	* reword commit message
v6:
	* use 'i915' for i915 device (Jouni)
	* remove unnecessary code for non-atomic mode setting
	  (Jouni, Ville)
	* fix function name in commit message (Jouni)
v3:
	* as before, silently ignore devices without displays
v2:
	* let drm_client_register() handle initial hotplug
	* fix driver name in error message (Jani)
	* fix non-fbdev build (kernel test robot)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/i915/display/intel_display.c  |   1 -
 .../drm/i915/display/intel_display_driver.c   |  18 --
 drivers/gpu/drm/i915/display/intel_fbdev.c    | 177 ++++++++----------
 drivers/gpu/drm/i915/display/intel_fbdev.h    |  20 +-
 drivers/gpu/drm/i915/i915_driver.c            |   2 +
 drivers/gpu/drm/xe/display/xe_display.c       |   2 -
 6 files changed, 80 insertions(+), 140 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index ab2f52d21bad8..4ef1e73cffd1e 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -85,7 +85,6 @@
 #include "intel_dvo.h"
 #include "intel_fb.h"
 #include "intel_fbc.h"
-#include "intel_fbdev.h"
 #include "intel_fdi.h"
 #include "intel_fifo_underrun.h"
 #include "intel_frontbuffer.h"
diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
index ca92c48fbdc49..6e875cacf0585 100644
--- a/drivers/gpu/drm/i915/display/intel_display_driver.c
+++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
@@ -513,10 +513,6 @@ int intel_display_driver_probe(struct drm_i915_private *i915)
 
 	intel_overlay_setup(i915);
 
-	ret = intel_fbdev_init(&i915->drm);
-	if (ret)
-		return ret;
-
 	/* Only enable hotplug handling once the fbdev is fully set up. */
 	intel_hpd_init(i915);
 
@@ -543,16 +539,6 @@ void intel_display_driver_register(struct drm_i915_private *i915)
 
 	intel_display_debugfs_register(i915);
 
-	/*
-	 * Some ports require correctly set-up hpd registers for
-	 * detection to work properly (leading to ghost connected
-	 * connector status), e.g. VGA on gm45.  Hence we can only set
-	 * up the initial fbdev config after hpd irqs are fully
-	 * enabled. We do it last so that the async config cannot run
-	 * before the connectors are registered.
-	 */
-	intel_fbdev_initial_config_async(i915);
-
 	/*
 	 * We need to coordinate the hotplugs with the asynchronous
 	 * fbdev configuration, for which we use the
@@ -596,9 +582,6 @@ void intel_display_driver_remove_noirq(struct drm_i915_private *i915)
 	 */
 	intel_hpd_poll_fini(i915);
 
-	/* poll work can call into fbdev, hence clean that up afterwards */
-	intel_fbdev_fini(i915);
-
 	intel_unregister_dsm_handler();
 
 	/* flush any delayed tasks or pending work */
@@ -637,7 +620,6 @@ void intel_display_driver_unregister(struct drm_i915_private *i915)
 	if (!HAS_DISPLAY(i915))
 		return;
 
-	intel_fbdev_unregister(i915);
 	/*
 	 * After flushing the fbdev (incl. a late async config which
 	 * will have delayed queuing of a hotplug event), then flush
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 938ee709813df..062f4f937cb1c 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -24,7 +24,6 @@
  *     David Airlie
  */
 
-#include <linux/async.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
@@ -39,6 +38,7 @@
 #include <linux/vga_switcheroo.h>
 
 #include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -58,7 +58,6 @@ struct intel_fbdev {
 	struct intel_framebuffer *fb;
 	struct i915_vma *vma;
 	unsigned long vma_flags;
-	async_cookie_t cookie;
 	int preferred_bpp;
 
 	/* Whether or not fbdev hpd processing is temporarily suspended */
@@ -135,6 +134,26 @@ static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 	return i915_gem_fb_mmap(obj, vma);
 }
 
+static void intel_fbdev_fb_destroy(struct fb_info *info)
+{
+	struct drm_fb_helper *fb_helper = info->par;
+	struct intel_fbdev *ifbdev = container_of(fb_helper, struct intel_fbdev, helper);
+
+	drm_fb_helper_fini(&ifbdev->helper);
+
+	/*
+	 * We rely on the object-free to release the VMA pinning for
+	 * the info->screen_base mmaping. Leaking the VMA is simpler than
+	 * trying to rectify all the possible error paths leading here.
+	 */
+	intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
+	drm_framebuffer_remove(&ifbdev->fb->base);
+
+	drm_client_release(&fb_helper->client);
+	drm_fb_helper_unprepare(&ifbdev->helper);
+	kfree(ifbdev);
+}
+
 static const struct fb_ops intelfb_ops = {
 	.owner = THIS_MODULE,
 	__FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
@@ -144,6 +163,7 @@ static const struct fb_ops intelfb_ops = {
 	.fb_pan_display = intel_fbdev_pan_display,
 	__FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev),
 	.fb_mmap = intel_fbdev_mmap,
+	.fb_destroy = intel_fbdev_fb_destroy,
 };
 
 static int intelfb_create(struct drm_fb_helper *helper,
@@ -153,7 +173,6 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	struct intel_framebuffer *intel_fb = ifbdev->fb;
 	struct drm_device *dev = helper->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 	const struct i915_gtt_view view = {
 		.type = I915_GTT_VIEW_NORMAL,
 	};
@@ -245,7 +264,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	ifbdev->vma_flags = flags;
 
 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
-	vga_switcheroo_client_fb_set(pdev, info);
+
 	return 0;
 
 out_unpin:
@@ -271,26 +290,6 @@ static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 	.fb_dirty = intelfb_dirty,
 };
 
-static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
-{
-	/* We rely on the object-free to release the VMA pinning for
-	 * the info->screen_base mmaping. Leaking the VMA is simpler than
-	 * trying to rectify all the possible error paths leading here.
-	 */
-
-	drm_fb_helper_fini(&ifbdev->helper);
-
-	if (ifbdev->vma)
-		intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
-
-	if (ifbdev->fb)
-		drm_framebuffer_remove(&ifbdev->fb->base);
-
-	drm_client_release(&ifbdev->helper.client);
-	drm_fb_helper_unprepare(&ifbdev->helper);
-	kfree(ifbdev);
-}
-
 /*
  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
  * The core display code will have read out the current plane configuration,
@@ -454,16 +453,6 @@ static void intel_fbdev_suspend_worker(struct work_struct *work)
 				true);
 }
 
-static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
-{
-	if (!ifbdev->cookie)
-		return;
-
-	/* Only serialises with all preceding async calls, hence +1 */
-	async_synchronize_cookie(ifbdev->cookie + 1);
-	ifbdev->cookie = 0;
-}
-
 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
  * processing, fbdev will perform a full connector reprobe if a hotplug event
  * was received while HPD was suspended.
@@ -554,8 +543,6 @@ static int intel_fbdev_output_poll_changed(struct drm_device *dev)
 	if (!ifbdev)
 		return -EINVAL;
 
-	intel_fbdev_sync(ifbdev);
-
 	mutex_lock(&ifbdev->hpd_lock);
 	send_hpd = !ifbdev->hpd_suspended;
 	ifbdev->hpd_waiting = true;
@@ -575,7 +562,6 @@ static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 	if (!ifbdev)
 		return -EINVAL;
 
-	intel_fbdev_sync(ifbdev);
 	if (!ifbdev->vma)
 		return -ENOMEM;
 
@@ -593,7 +579,20 @@ static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
  */
 
 static void intel_fbdev_client_unregister(struct drm_client_dev *client)
-{ }
+{
+	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
+	struct drm_device *dev = fb_helper->dev;
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+	if (fb_helper->info) {
+		vga_switcheroo_client_fb_set(pdev, NULL);
+		drm_fb_helper_unregister_info(fb_helper);
+	} else {
+		drm_fb_helper_unprepare(fb_helper);
+		drm_client_release(&fb_helper->client);
+		kfree(fb_helper);
+	}
+}
 
 static int intel_fbdev_client_restore(struct drm_client_dev *client)
 {
@@ -611,7 +610,31 @@ static int intel_fbdev_client_restore(struct drm_client_dev *client)
 
 static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
 {
-	return intel_fbdev_output_poll_changed(client->dev);
+	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
+	struct drm_device *dev = client->dev;
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	int ret;
+
+	if (dev->fb_helper)
+		return intel_fbdev_output_poll_changed(dev);
+
+	ret = drm_fb_helper_init(dev, fb_helper);
+	if (ret)
+		goto err_drm_err;
+
+	ret = drm_fb_helper_initial_config(fb_helper);
+	if (ret)
+		goto err_drm_fb_helper_fini;
+
+	vga_switcheroo_client_fb_set(pdev, fb_helper->info);
+
+	return 0;
+
+err_drm_fb_helper_fini:
+	drm_fb_helper_fini(fb_helper);
+err_drm_err:
+	drm_err(dev, "Failed to setup i915 fbdev emulation (ret=%d)\n", ret);
+	return ret;
 }
 
 static const struct drm_client_funcs intel_fbdev_client_funcs = {
@@ -621,22 +644,23 @@ static const struct drm_client_funcs intel_fbdev_client_funcs = {
 	.hotplug	= intel_fbdev_client_hotplug,
 };
 
-int intel_fbdev_init(struct drm_device *dev)
+void intel_fbdev_setup(struct drm_i915_private *i915)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct drm_device *dev = &i915->drm;
 	struct intel_fbdev *ifbdev;
 	int ret;
 
-	if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
-		return -ENODEV;
+	if (!HAS_DISPLAY(i915))
+		return;
 
 	ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
 	if (!ifbdev)
-		return -ENOMEM;
-
-	mutex_init(&ifbdev->hpd_lock);
+		return;
 	drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
 
+	i915->display.fbdev.fbdev = ifbdev;
+	INIT_WORK(&i915->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
+	mutex_init(&ifbdev->hpd_lock);
 	if (intel_fbdev_init_bios(dev, ifbdev))
 		ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
 	else
@@ -644,68 +668,19 @@ int intel_fbdev_init(struct drm_device *dev)
 
 	ret = drm_client_init(dev, &ifbdev->helper.client, "intel-fbdev",
 			      &intel_fbdev_client_funcs);
-	if (ret)
+	if (ret) {
+		drm_err(dev, "Failed to register client: %d\n", ret);
 		goto err_drm_fb_helper_unprepare;
+	}
 
-	ret = drm_fb_helper_init(dev, &ifbdev->helper);
-	if (ret)
-		goto err_drm_client_release;
-
-	dev_priv->display.fbdev.fbdev = ifbdev;
-	INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
+	drm_client_register(&ifbdev->helper.client);
 
-	return 0;
+	return;
 
-err_drm_client_release:
-	drm_client_release(&ifbdev->helper.client);
 err_drm_fb_helper_unprepare:
 	drm_fb_helper_unprepare(&ifbdev->helper);
+	mutex_destroy(&ifbdev->hpd_lock);
 	kfree(ifbdev);
-	return ret;
-}
-
-static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
-{
-	struct intel_fbdev *ifbdev = data;
-
-	/* Due to peculiar init order wrt to hpd handling this is separate. */
-	if (drm_fb_helper_initial_config(&ifbdev->helper))
-		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
-}
-
-void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
-{
-	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
-	if (!ifbdev)
-		return;
-
-	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
-}
-
-void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
-{
-	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
-	if (!ifbdev)
-		return;
-
-	intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
-
-	if (!current_is_async())
-		intel_fbdev_sync(ifbdev);
-
-	drm_fb_helper_unregister_info(&ifbdev->helper);
-}
-
-void intel_fbdev_fini(struct drm_i915_private *dev_priv)
-{
-	struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
-
-	if (!ifbdev)
-		return;
-
-	intel_fbdev_destroy(ifbdev);
 }
 
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h b/drivers/gpu/drm/i915/display/intel_fbdev.h
index 8c953f102ba22..08de2d5b34338 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.h
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.h
@@ -14,27 +14,11 @@ struct intel_fbdev;
 struct intel_framebuffer;
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
-int intel_fbdev_init(struct drm_device *dev);
-void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv);
-void intel_fbdev_unregister(struct drm_i915_private *dev_priv);
-void intel_fbdev_fini(struct drm_i915_private *dev_priv);
+void intel_fbdev_setup(struct drm_i915_private *dev_priv);
 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous);
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev);
 #else
-static inline int intel_fbdev_init(struct drm_device *dev)
-{
-	return 0;
-}
-
-static inline void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
-{
-}
-
-static inline void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
-{
-}
-
-static inline void intel_fbdev_fini(struct drm_i915_private *dev_priv)
+static inline void intel_fbdev_setup(struct drm_i915_private *dev_priv)
 {
 }
 
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index e0f13c62a1832..69178b73845e1 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -816,6 +816,8 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	i915->do_release = true;
 
+	intel_fbdev_setup(i915);
+
 	return 0;
 
 out_cleanup_gem:
diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
index cdbc3f04c80a7..ca5cbe1d8a03b 100644
--- a/drivers/gpu/drm/xe/display/xe_display.c
+++ b/drivers/gpu/drm/xe/display/xe_display.c
@@ -214,9 +214,7 @@ void xe_display_fini(struct xe_device *xe)
 	if (!xe->info.enable_display)
 		return;
 
-	/* poll work can call into fbdev, hence clean that up afterwards */
 	intel_hpd_poll_fini(xe);
-	intel_fbdev_fini(xe);
 
 	intel_hdcp_component_fini(xe);
 	intel_audio_deinit(xe);
-- 
2.43.2

Re: [PATCH v7 6/6] drm/i915: Implement fbdev emulation as in-kernel client

[Hogander, Jouni]

On Fri, 2024-03-01 at 14:42 +0100, Thomas Zimmermann wrote:
> Replace all code that initializes or releases fbdev emulation
> throughout the driver. Instead initialize the fbdev client by a
> single call to intel_fbdev_setup() after i915 has registered its
> DRM device. Just like similar code in other drivers, i915 fbdev
> emulation now acts like a regular DRM client.
> 
> The fbdev client setup consists of the initial preparation and the
> hot-plugging of the display. The latter creates the fbdev device
> and sets up the fbdev framebuffer. The setup performs display
> hot-plugging once. If no display can be detected, DRM probe helpers
> re-run the detection on each hotplug event.
> 
> A call to drm_client_dev_unregister() releases all in-kernel clients
> automatically. No further action is required within i915. If the
> fbdev
> framebuffer has been fully set up, struct fb_ops.fb_destroy
> implements
> the release. For partially initialized emulation, the fbdev client
> reverts the initial setup. Do the same for xe and remove its call to
> intel_fbdev_fini().
> 
> v7:
>         * update xe driver
>         * reword commit message
> v6:
>         * use 'i915' for i915 device (Jouni)
>         * remove unnecessary code for non-atomic mode setting
>           (Jouni, Ville)
>         * fix function name in commit message (Jouni)
> v3:
>         * as before, silently ignore devices without displays
> v2:
>         * let drm_client_register() handle initial hotplug
>         * fix driver name in error message (Jani)
>         * fix non-fbdev build (kernel test robot)
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c  |   1 -
>  .../drm/i915/display/intel_display_driver.c   |  18 --
>  drivers/gpu/drm/i915/display/intel_fbdev.c    | 177 ++++++++--------
> --
>  drivers/gpu/drm/i915/display/intel_fbdev.h    |  20 +-
>  drivers/gpu/drm/i915/i915_driver.c            |   2 +
>  drivers/gpu/drm/xe/display/xe_display.c       |   2 -
>  6 files changed, 80 insertions(+), 140 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index ab2f52d21bad8..4ef1e73cffd1e 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -85,7 +85,6 @@
>  #include "intel_dvo.h"
>  #include "intel_fb.h"
>  #include "intel_fbc.h"
> -#include "intel_fbdev.h"
>  #include "intel_fdi.h"
>  #include "intel_fifo_underrun.h"
>  #include "intel_frontbuffer.h"
> diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c
> b/drivers/gpu/drm/i915/display/intel_display_driver.c
> index ca92c48fbdc49..6e875cacf0585 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_driver.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
> @@ -513,10 +513,6 @@ int intel_display_driver_probe(struct
> drm_i915_private *i915)
>  
>         intel_overlay_setup(i915);
>  
> -       ret = intel_fbdev_init(&i915->drm);
> -       if (ret)
> -               return ret;
> -
>         /* Only enable hotplug handling once the fbdev is fully set
> up. */
>         intel_hpd_init(i915);
>  
> @@ -543,16 +539,6 @@ void intel_display_driver_register(struct
> drm_i915_private *i915)
>  
>         intel_display_debugfs_register(i915);
>  
> -       /*
> -        * Some ports require correctly set-up hpd registers for
> -        * detection to work properly (leading to ghost connected
> -        * connector status), e.g. VGA on gm45.  Hence we can only
> set
> -        * up the initial fbdev config after hpd irqs are fully
> -        * enabled. We do it last so that the async config cannot run
> -        * before the connectors are registered.
> -        */
> -       intel_fbdev_initial_config_async(i915);
> -
>         /*
>          * We need to coordinate the hotplugs with the asynchronous
>          * fbdev configuration, for which we use the
> @@ -596,9 +582,6 @@ void intel_display_driver_remove_noirq(struct
> drm_i915_private *i915)
>          */
>         intel_hpd_poll_fini(i915);
>  
> -       /* poll work can call into fbdev, hence clean that up
> afterwards */
> -       intel_fbdev_fini(i915);
> -
>         intel_unregister_dsm_handler();
>  
>         /* flush any delayed tasks or pending work */
> @@ -637,7 +620,6 @@ void intel_display_driver_unregister(struct
> drm_i915_private *i915)
>         if (!HAS_DISPLAY(i915))
>                 return;
>  
> -       intel_fbdev_unregister(i915);
>         /*
>          * After flushing the fbdev (incl. a late async config which
>          * will have delayed queuing of a hotplug event), then flush
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c
> b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 938ee709813df..062f4f937cb1c 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -24,7 +24,6 @@
>   *     David Airlie
>   */
>  
> -#include <linux/async.h>
>  #include <linux/console.h>
>  #include <linux/delay.h>
>  #include <linux/errno.h>
> @@ -39,6 +38,7 @@
>  #include <linux/vga_switcheroo.h>
>  
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_fourcc.h>
>  #include <drm/drm_gem_framebuffer_helper.h>
> @@ -58,7 +58,6 @@ struct intel_fbdev {
>         struct intel_framebuffer *fb;
>         struct i915_vma *vma;
>         unsigned long vma_flags;
> -       async_cookie_t cookie;
>         int preferred_bpp;
>  
>         /* Whether or not fbdev hpd processing is temporarily
> suspended */
> @@ -135,6 +134,26 @@ static int intel_fbdev_mmap(struct fb_info
> *info, struct vm_area_struct *vma)
>         return i915_gem_fb_mmap(obj, vma);
>  }
>  
> +static void intel_fbdev_fb_destroy(struct fb_info *info)
> +{
> +       struct drm_fb_helper *fb_helper = info->par;
> +       struct intel_fbdev *ifbdev = container_of(fb_helper, struct
> intel_fbdev, helper);
> +
> +       drm_fb_helper_fini(&ifbdev->helper);
> +
> +       /*
> +        * We rely on the object-free to release the VMA pinning for
> +        * the info->screen_base mmaping. Leaking the VMA is simpler
> than
> +        * trying to rectify all the possible error paths leading
> here.
> +        */
> +       intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
> +       drm_framebuffer_remove(&ifbdev->fb->base);
> +
> +       drm_client_release(&fb_helper->client);
> +       drm_fb_helper_unprepare(&ifbdev->helper);
> +       kfree(ifbdev);
> +}
> +
>  static const struct fb_ops intelfb_ops = {
>         .owner = THIS_MODULE,
>         __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
> @@ -144,6 +163,7 @@ static const struct fb_ops intelfb_ops = {
>         .fb_pan_display = intel_fbdev_pan_display,
>         __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev),
>         .fb_mmap = intel_fbdev_mmap,
> +       .fb_destroy = intel_fbdev_fb_destroy,
>  };
>  
>  static int intelfb_create(struct drm_fb_helper *helper,
> @@ -153,7 +173,6 @@ static int intelfb_create(struct drm_fb_helper
> *helper,
>         struct intel_framebuffer *intel_fb = ifbdev->fb;
>         struct drm_device *dev = helper->dev;
>         struct drm_i915_private *dev_priv = to_i915(dev);
> -       struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
>         const struct i915_gtt_view view = {
>                 .type = I915_GTT_VIEW_NORMAL,
>         };
> @@ -245,7 +264,7 @@ static int intelfb_create(struct drm_fb_helper
> *helper,
>         ifbdev->vma_flags = flags;
>  
>         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
> -       vga_switcheroo_client_fb_set(pdev, info);
> +
>         return 0;
>  
>  out_unpin:
> @@ -271,26 +290,6 @@ static const struct drm_fb_helper_funcs
> intel_fb_helper_funcs = {
>         .fb_dirty = intelfb_dirty,
>  };
>  
> -static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
> -{
> -       /* We rely on the object-free to release the VMA pinning for
> -        * the info->screen_base mmaping. Leaking the VMA is simpler
> than
> -        * trying to rectify all the possible error paths leading
> here.
> -        */
> -
> -       drm_fb_helper_fini(&ifbdev->helper);
> -
> -       if (ifbdev->vma)
> -               intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
> -
> -       if (ifbdev->fb)
> -               drm_framebuffer_remove(&ifbdev->fb->base);
> -
> -       drm_client_release(&ifbdev->helper.client);
> -       drm_fb_helper_unprepare(&ifbdev->helper);
> -       kfree(ifbdev);
> -}
> -
>  /*
>   * Build an intel_fbdev struct using a BIOS allocated framebuffer,
> if possible.
>   * The core display code will have read out the current plane
> configuration,
> @@ -454,16 +453,6 @@ static void intel_fbdev_suspend_worker(struct
> work_struct *work)
>                                 true);
>  }
>  
> -static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
> -{
> -       if (!ifbdev->cookie)
> -               return;
> -
> -       /* Only serialises with all preceding async calls, hence +1
> */
> -       async_synchronize_cookie(ifbdev->cookie + 1);
> -       ifbdev->cookie = 0;
> -}
> -
>  /* Suspends/resumes fbdev processing of incoming HPD events. When
> resuming HPD
>   * processing, fbdev will perform a full connector reprobe if a
> hotplug event
>   * was received while HPD was suspended.
> @@ -554,8 +543,6 @@ static int intel_fbdev_output_poll_changed(struct
> drm_device *dev)
>         if (!ifbdev)
>                 return -EINVAL;
>  
> -       intel_fbdev_sync(ifbdev);
> -
>         mutex_lock(&ifbdev->hpd_lock);
>         send_hpd = !ifbdev->hpd_suspended;
>         ifbdev->hpd_waiting = true;
> @@ -575,7 +562,6 @@ static int intel_fbdev_restore_mode(struct
> drm_i915_private *dev_priv)
>         if (!ifbdev)
>                 return -EINVAL;
>  
> -       intel_fbdev_sync(ifbdev);
>         if (!ifbdev->vma)
>                 return -ENOMEM;
>  
> @@ -593,7 +579,20 @@ static int intel_fbdev_restore_mode(struct
> drm_i915_private *dev_priv)
>   */
>  
>  static void intel_fbdev_client_unregister(struct drm_client_dev
> *client)
> -{ }
> +{
> +       struct drm_fb_helper *fb_helper =
> drm_fb_helper_from_client(client);
> +       struct drm_device *dev = fb_helper->dev;
> +       struct pci_dev *pdev = to_pci_dev(dev->dev);
> +
> +       if (fb_helper->info) {
> +               vga_switcheroo_client_fb_set(pdev, NULL);
> +               drm_fb_helper_unregister_info(fb_helper);
> +       } else {
> +               drm_fb_helper_unprepare(fb_helper);
> +               drm_client_release(&fb_helper->client);
> +               kfree(fb_helper);
> +       }
> +}
>  
>  static int intel_fbdev_client_restore(struct drm_client_dev *client)
>  {
> @@ -611,7 +610,31 @@ static int intel_fbdev_client_restore(struct
> drm_client_dev *client)
>  
>  static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
>  {
> -       return intel_fbdev_output_poll_changed(client->dev);
> +       struct drm_fb_helper *fb_helper =
> drm_fb_helper_from_client(client);
> +       struct drm_device *dev = client->dev;
> +       struct pci_dev *pdev = to_pci_dev(dev->dev);
> +       int ret;
> +
> +       if (dev->fb_helper)
> +               return intel_fbdev_output_poll_changed(dev);
> +
> +       ret = drm_fb_helper_init(dev, fb_helper);
> +       if (ret)
> +               goto err_drm_err;
> +
> +       ret = drm_fb_helper_initial_config(fb_helper);
> +       if (ret)
> +               goto err_drm_fb_helper_fini;
> +
> +       vga_switcheroo_client_fb_set(pdev, fb_helper->info);
> +
> +       return 0;
> +
> +err_drm_fb_helper_fini:
> +       drm_fb_helper_fini(fb_helper);
> +err_drm_err:
> +       drm_err(dev, "Failed to setup i915 fbdev emulation
> (ret=%d)\n", ret);
> +       return ret;
>  }
>  
>  static const struct drm_client_funcs intel_fbdev_client_funcs = {
> @@ -621,22 +644,23 @@ static const struct drm_client_funcs
> intel_fbdev_client_funcs = {
>         .hotplug        = intel_fbdev_client_hotplug,
>  };
>  
> -int intel_fbdev_init(struct drm_device *dev)
> +void intel_fbdev_setup(struct drm_i915_private *i915)
>  {
> -       struct drm_i915_private *dev_priv = to_i915(dev);
> +       struct drm_device *dev = &i915->drm;
>         struct intel_fbdev *ifbdev;
>         int ret;
>  
> -       if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
> -               return -ENODEV;
> +       if (!HAS_DISPLAY(i915))
> +               return;
>  
>         ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
>         if (!ifbdev)
> -               return -ENOMEM;
> -
> -       mutex_init(&ifbdev->hpd_lock);
> +               return;
>         drm_fb_helper_prepare(dev, &ifbdev->helper, 32,
> &intel_fb_helper_funcs);
>  
> +       i915->display.fbdev.fbdev = ifbdev;
> +       INIT_WORK(&i915->display.fbdev.suspend_work,
> intel_fbdev_suspend_worker);
> +       mutex_init(&ifbdev->hpd_lock);
>         if (intel_fbdev_init_bios(dev, ifbdev))
>                 ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
>         else
> @@ -644,68 +668,19 @@ int intel_fbdev_init(struct drm_device *dev)
>  
>         ret = drm_client_init(dev, &ifbdev->helper.client, "intel-
> fbdev",
>                               &intel_fbdev_client_funcs);
> -       if (ret)
> +       if (ret) {
> +               drm_err(dev, "Failed to register client: %d\n", ret);
>                 goto err_drm_fb_helper_unprepare;
> +       }
>  
> -       ret = drm_fb_helper_init(dev, &ifbdev->helper);
> -       if (ret)
> -               goto err_drm_client_release;
> -
> -       dev_priv->display.fbdev.fbdev = ifbdev;
> -       INIT_WORK(&dev_priv->display.fbdev.suspend_work,
> intel_fbdev_suspend_worker);
> +       drm_client_register(&ifbdev->helper.client);
>  
> -       return 0;
> +       return;
>  
> -err_drm_client_release:
> -       drm_client_release(&ifbdev->helper.client);
>  err_drm_fb_helper_unprepare:
>         drm_fb_helper_unprepare(&ifbdev->helper);
> +       mutex_destroy(&ifbdev->hpd_lock);
>         kfree(ifbdev);
> -       return ret;
> -}
> -
> -static void intel_fbdev_initial_config(void *data, async_cookie_t
> cookie)
> -{
> -       struct intel_fbdev *ifbdev = data;
> -
> -       /* Due to peculiar init order wrt to hpd handling this is
> separate. */
> -       if (drm_fb_helper_initial_config(&ifbdev->helper))
> -               intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
> -}
> -
> -void intel_fbdev_initial_config_async(struct drm_i915_private
> *dev_priv)
> -{
> -       struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
> -
> -       if (!ifbdev)
> -               return;
> -
> -       ifbdev->cookie = async_schedule(intel_fbdev_initial_config,
> ifbdev);
> -}
> -
> -void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
> -{
> -       struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
> -
> -       if (!ifbdev)
> -               return;
> -
> -       intel_fbdev_set_suspend(&dev_priv->drm,
> FBINFO_STATE_SUSPENDED, true);
> -
> -       if (!current_is_async())
> -               intel_fbdev_sync(ifbdev);
> -
> -       drm_fb_helper_unregister_info(&ifbdev->helper);
> -}
> -
> -void intel_fbdev_fini(struct drm_i915_private *dev_priv)
> -{
> -       struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv-
> >display.fbdev.fbdev);
> -
> -       if (!ifbdev)
> -               return;
> -
> -       intel_fbdev_destroy(ifbdev);
>  }
>  
>  struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev
> *fbdev)
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h
> b/drivers/gpu/drm/i915/display/intel_fbdev.h
> index 8c953f102ba22..08de2d5b34338 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.h
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.h
> @@ -14,27 +14,11 @@ struct intel_fbdev;
>  struct intel_framebuffer;
>  
>  #ifdef CONFIG_DRM_FBDEV_EMULATION
> -int intel_fbdev_init(struct drm_device *dev);
> -void intel_fbdev_initial_config_async(struct drm_i915_private
> *dev_priv);
> -void intel_fbdev_unregister(struct drm_i915_private *dev_priv);
> -void intel_fbdev_fini(struct drm_i915_private *dev_priv);
> +void intel_fbdev_setup(struct drm_i915_private *dev_priv);
>  void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool
> synchronous);
>  struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev
> *fbdev);
>  #else
> -static inline int intel_fbdev_init(struct drm_device *dev)
> -{
> -       return 0;
> -}
> -
> -static inline void intel_fbdev_initial_config_async(struct
> drm_i915_private *dev_priv)
> -{
> -}
> -
> -static inline void intel_fbdev_unregister(struct drm_i915_private
> *dev_priv)
> -{
> -}
> -
> -static inline void intel_fbdev_fini(struct drm_i915_private
> *dev_priv)
> +static inline void intel_fbdev_setup(struct drm_i915_private
> *dev_priv)
>  {
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_driver.c
> b/drivers/gpu/drm/i915/i915_driver.c
> index e0f13c62a1832..69178b73845e1 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -816,6 +816,8 @@ int i915_driver_probe(struct pci_dev *pdev, const
> struct pci_device_id *ent)
>  
>         i915->do_release = true;
>  
> +       intel_fbdev_setup(i915);
> +

This doesn't work for Xe. I propose you move it to
drivers/gpu/drm/i915/display/intel_display_dirver.c:intel_display_drive
r_probe? Otherwise patch looks ok to me.

BR,

Jouni Högander


>         return 0;
>  
>  out_cleanup_gem:
> diff --git a/drivers/gpu/drm/xe/display/xe_display.c
> b/drivers/gpu/drm/xe/display/xe_display.c
> index cdbc3f04c80a7..ca5cbe1d8a03b 100644
> --- a/drivers/gpu/drm/xe/display/xe_display.c
> +++ b/drivers/gpu/drm/xe/display/xe_display.c
> @@ -214,9 +214,7 @@ void xe_display_fini(struct xe_device *xe)
>         if (!xe->info.enable_display)
>                 return;
>  
> -       /* poll work can call into fbdev, hence clean that up
> afterwards */
>         intel_hpd_poll_fini(xe);
> -       intel_fbdev_fini(xe);
>  
>         intel_hdcp_component_fini(xe);
>         intel_audio_deinit(xe);

Re: [PATCH v7 6/6] drm/i915: Implement fbdev emulation as in-kernel client

[Thomas Zimmermann]

Hi

Am 05.04.24 um 10:34 schrieb Hogander, Jouni:
[...]
>>   
>> diff --git a/drivers/gpu/drm/i915/i915_driver.c
>> b/drivers/gpu/drm/i915/i915_driver.c
>> index e0f13c62a1832..69178b73845e1 100644
>> --- a/drivers/gpu/drm/i915/i915_driver.c
>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>> @@ -816,6 +816,8 @@ int i915_driver_probe(struct pci_dev *pdev, const
>> struct pci_device_id *ent)
>>   
>>          i915->do_release = true;
>>   
>> +       intel_fbdev_setup(i915);
>> +
> This doesn't work for Xe. I propose you move it to
> drivers/gpu/drm/i915/display/intel_display_dirver.c:intel_display_drive
> r_probe? Otherwise patch looks ok to me.

Can you say why it doesn't work? It's been a while, but IIRC I ran this 
patch on xe for testing.

Best regards
Thomas

>
> BR,
>
> Jouni Högander
>
>
>>          return 0;
>>   
>>   out_cleanup_gem:
>> diff --git a/drivers/gpu/drm/xe/display/xe_display.c
>> b/drivers/gpu/drm/xe/display/xe_display.c
>> index cdbc3f04c80a7..ca5cbe1d8a03b 100644
>> --- a/drivers/gpu/drm/xe/display/xe_display.c
>> +++ b/drivers/gpu/drm/xe/display/xe_display.c
>> @@ -214,9 +214,7 @@ void xe_display_fini(struct xe_device *xe)
>>          if (!xe->info.enable_display)
>>                  return;
>>   
>> -       /* poll work can call into fbdev, hence clean that up
>> afterwards */
>>          intel_hpd_poll_fini(xe);
>> -       intel_fbdev_fini(xe);
>>   
>>          intel_hdcp_component_fini(xe);
>>          intel_audio_deinit(xe);

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH v7 6/6] drm/i915: Implement fbdev emulation as in-kernel client

[Hogander, Jouni]

On Fri, 2024-04-05 at 10:59 +0200, Thomas Zimmermann wrote:
> Hi
> 
> Am 05.04.24 um 10:34 schrieb Hogander, Jouni:
> [...]
> > >   
> > > diff --git a/drivers/gpu/drm/i915/i915_driver.c
> > > b/drivers/gpu/drm/i915/i915_driver.c
> > > index e0f13c62a1832..69178b73845e1 100644
> > > --- a/drivers/gpu/drm/i915/i915_driver.c
> > > +++ b/drivers/gpu/drm/i915/i915_driver.c
> > > @@ -816,6 +816,8 @@ int i915_driver_probe(struct pci_dev *pdev,
> > > const
> > > struct pci_device_id *ent)
> > >   
> > >          i915->do_release = true;
> > >   
> > > +       intel_fbdev_setup(i915);
> > > +
> > This doesn't work for Xe. I propose you move it to
> > drivers/gpu/drm/i915/display/intel_display_dirver.c:intel_display_d
> > rive
> > r_probe? Otherwise patch looks ok to me.
> 
> Can you say why it doesn't work? It's been a while, but IIRC I ran
> this 
> patch on xe for testing.

i915_driver_probe is not used by Xe driver and I can't find own call to
intel_fbdev_setup in Xe driver.

BR,

Jouni Högander
 
> 
> Best regards
> Thomas
> 
> > 
> > BR,
> > 
> > Jouni Högander
> > 
> > 
> > >          return 0;
> > >   
> > >   out_cleanup_gem:
> > > diff --git a/drivers/gpu/drm/xe/display/xe_display.c
> > > b/drivers/gpu/drm/xe/display/xe_display.c
> > > index cdbc3f04c80a7..ca5cbe1d8a03b 100644
> > > --- a/drivers/gpu/drm/xe/display/xe_display.c
> > > +++ b/drivers/gpu/drm/xe/display/xe_display.c
> > > @@ -214,9 +214,7 @@ void xe_display_fini(struct xe_device *xe)
> > >          if (!xe->info.enable_display)
> > >                  return;
> > >   
> > > -       /* poll work can call into fbdev, hence clean that up
> > > afterwards */
> > >          intel_hpd_poll_fini(xe);
> > > -       intel_fbdev_fini(xe);
> > >   
> > >          intel_hdcp_component_fini(xe);
> > >          intel_audio_deinit(xe);
> 

Re: [PATCH v7 6/6] drm/i915: Implement fbdev emulation as in-kernel client

[Thomas Zimmermann]

Hi

Am 05.04.24 um 11:04 schrieb Hogander, Jouni:
> On Fri, 2024-04-05 at 10:59 +0200, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 05.04.24 um 10:34 schrieb Hogander, Jouni:
>> [...]
>>>>    
>>>> diff --git a/drivers/gpu/drm/i915/i915_driver.c
>>>> b/drivers/gpu/drm/i915/i915_driver.c
>>>> index e0f13c62a1832..69178b73845e1 100644
>>>> --- a/drivers/gpu/drm/i915/i915_driver.c
>>>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>>>> @@ -816,6 +816,8 @@ int i915_driver_probe(struct pci_dev *pdev,
>>>> const
>>>> struct pci_device_id *ent)
>>>>    
>>>>           i915->do_release = true;
>>>>    
>>>> +       intel_fbdev_setup(i915);
>>>> +
>>> This doesn't work for Xe. I propose you move it to
>>> drivers/gpu/drm/i915/display/intel_display_dirver.c:intel_display_d
>>> rive
>>> r_probe? Otherwise patch looks ok to me.
>> Can you say why it doesn't work? It's been a while, but IIRC I ran
>> this
>> patch on xe for testing.
> i915_driver_probe is not used by Xe driver and I can't find own call to
> intel_fbdev_setup in Xe driver.

Ok, thanks a lot for reviewing these patches. I'll send out an update soon.

Best regards
Thomas

>
> BR,
>
> Jouni Högander
>   
>> Best regards
>> Thomas
>>
>>> BR,
>>>
>>> Jouni Högander
>>>
>>>
>>>>           return 0;
>>>>    
>>>>    out_cleanup_gem:
>>>> diff --git a/drivers/gpu/drm/xe/display/xe_display.c
>>>> b/drivers/gpu/drm/xe/display/xe_display.c
>>>> index cdbc3f04c80a7..ca5cbe1d8a03b 100644
>>>> --- a/drivers/gpu/drm/xe/display/xe_display.c
>>>> +++ b/drivers/gpu/drm/xe/display/xe_display.c
>>>> @@ -214,9 +214,7 @@ void xe_display_fini(struct xe_device *xe)
>>>>           if (!xe->info.enable_display)
>>>>                   return;
>>>>    
>>>> -       /* poll work can call into fbdev, hence clean that up
>>>> afterwards */
>>>>           intel_hpd_poll_fini(xe);
>>>> -       intel_fbdev_fini(xe);
>>>>    
>>>>           intel_hdcp_component_fini(xe);
>>>>           intel_audio_deinit(xe);

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH v7 6/6] drm/i915: Implement fbdev emulation as in-kernel client

[Thomas Zimmermann]

Hi

Am 05.04.24 um 10:34 schrieb Hogander, Jouni:
[...]
>>   
>> diff --git a/drivers/gpu/drm/i915/i915_driver.c
>> b/drivers/gpu/drm/i915/i915_driver.c
>> index e0f13c62a1832..69178b73845e1 100644
>> --- a/drivers/gpu/drm/i915/i915_driver.c
>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>> @@ -816,6 +816,8 @@ int i915_driver_probe(struct pci_dev *pdev, const
>> struct pci_device_id *ent)
>>   
>>          i915->do_release = true;
>>   
>> +       intel_fbdev_setup(i915);
>> +
> This doesn't work for Xe. I propose you move it to
> drivers/gpu/drm/i915/display/intel_display_dirver.c:intel_display_drive
> r_probe? Otherwise patch looks ok to me.

The client setup needs to run after the DRM device has been registered, 
so _probe is too early. intel_display_driver_register() looks like a 
possible place to put this. That would be symmetric to unregistering in 
intel_display_driver_unregister().

Best regards
Thomas

>
> BR,
>
> Jouni Högander
>
>
>>          return 0;
>>   
>>   out_cleanup_gem:
>> diff --git a/drivers/gpu/drm/xe/display/xe_display.c
>> b/drivers/gpu/drm/xe/display/xe_display.c
>> index cdbc3f04c80a7..ca5cbe1d8a03b 100644
>> --- a/drivers/gpu/drm/xe/display/xe_display.c
>> +++ b/drivers/gpu/drm/xe/display/xe_display.c
>> @@ -214,9 +214,7 @@ void xe_display_fini(struct xe_device *xe)
>>          if (!xe->info.enable_display)
>>                  return;
>>   
>> -       /* poll work can call into fbdev, hence clean that up
>> afterwards */
>>          intel_hpd_poll_fini(xe);
>> -       intel_fbdev_fini(xe);
>>   
>>          intel_hdcp_component_fini(xe);
>>          intel_audio_deinit(xe);

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)