[PATCH 01/11] drm: update todo.rst

[PATCH 01/11] drm: update todo.rst

[Daniel Vetter]

Just drive-by, but we have gsoc running so better to update it now.

Great news is that two entries can be removed because essentially all
done.

v2: Keep a bunch of the todos, Gabriel is working on them.

Cc: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 Documentation/gpu/todo.rst | 31 ++++---------------------------
 1 file changed, 4 insertions(+), 27 deletions(-)

diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
index e255b36b34a3..1bdb7356a310 100644
--- a/Documentation/gpu/todo.rst
+++ b/Documentation/gpu/todo.rst
@@ -16,7 +16,7 @@ De-midlayer drivers
 With the recent ``drm_bus`` cleanup patches for 3.17 it is no longer required
 to have a ``drm_bus`` structure set up. Drivers can directly set up the
 ``drm_device`` structure instead of relying on bus methods in ``drm_usb.c``
-and ``drm_platform.c``. The goal is to get rid of the driver's ``->load`` /
+and ``drm_pci.c``. The goal is to get rid of the driver's ``->load`` /
 ``->unload`` callbacks and open-code the load/unload sequence properly, using
 the new two-stage ``drm_device`` setup/teardown.
 
@@ -175,7 +175,7 @@ fine-grained per-buffer object and per-context lockings scheme. Currently the
 following drivers still use ``struct_mutex``: ``msm``, ``omapdrm`` and
 ``udl``.
 
-Contact: Daniel Vetter
+Contact: Daniel Vetter, respective driver maintainers
 
 Switch to drm_connector_list_iter for any connector_list walking
 ----------------------------------------------------------------
@@ -217,6 +217,8 @@ plan is to switch to per-file driver API headers, which will also structure
 the kerneldoc better. This should also allow more fine-grained ``#include``
 directives.
 
+In the end no .c file should need to include ``drmP.h`` anymore.
+
 Contact: Daniel Vetter
 
 Add missing kerneldoc for exported functions
@@ -244,13 +246,8 @@ be hidden so that driver writers don't accidentally end up using it. And to
 prevent security issues in those legacy IOCTLs from being exploited on modern
 drivers. This has multiple possible subtasks:
 
-* Make sure legacy IOCTLs can't be used on modern drivers.
 * Extract support code for legacy features into a ``drm-legacy.ko`` kernel
   module and compile it only when one of the legacy drivers is enabled.
-* Extract legacy functions into their own headers and remove it that from the
-  monolithic ``drmP.h`` header.
-* Remove any lingering cruft from the OS abstraction layer from modern
-  drivers.
 
 This is mostly done, the only thing left is to split up ``drm_irq.c`` into
 legacy cruft and the parts needed by modern KMS drivers.
@@ -408,23 +405,3 @@ Contact: Noralf Trønnes, Daniel Vetter
 
 Outside DRM
 ===========
-
-Better kerneldoc
-----------------
-
-This is pretty much done, but there's some advanced topics:
-
-Come up with a way to hyperlink to struct members. Currently you can hyperlink
-to the struct using ``#struct_name``, but not to a member within. Would need
-buy-in from kerneldoc maintainers, and the big question is how to make it work
-without totally unsightly
-``drm_foo_bar_really_long_structure->even_longer_memeber`` all over the text
-which breaks text flow.
-
-Figure out how to integrate the asciidoc support for ascii-diagrams. We have a
-few of those (e.g. to describe mode timings), and asciidoc supports converting
-some ascii-art dialect into pngs. Would be really pretty to make that work.
-
-Contact: Daniel Vetter, Jani Nikula
-
-Jani is working on this already, hopefully lands in 4.8.
-- 
2.11.0

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[PATCH 02/11] drm: Consolidate and document sysfs support

[Daniel Vetter]

- remove docs for internal func, doesn't add value
- add short overview snippet instead explaining that drivers don't
  have to bother themselves with reg/unreg concerns
- drop the ttm comment about drmP.h, drmP.h is disappearing ...

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 Documentation/gpu/drm-uapi.rst | 10 ++++++
 drivers/gpu/drm/drm_sysfs.c    | 70 ++++++++++++++++--------------------------
 include/drm/drmP.h             |  5 +--
 include/drm/drm_sysfs.h        |  8 ++---
 4 files changed, 42 insertions(+), 51 deletions(-)

diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
index 76356c86e358..8b0f0e403f0c 100644
--- a/Documentation/gpu/drm-uapi.rst
+++ b/Documentation/gpu/drm-uapi.rst
@@ -219,6 +219,16 @@ Debugfs Support
 .. kernel-doc:: drivers/gpu/drm/drm_debugfs.c
    :export:
 
+Sysfs Support
+=============
+
+.. kernel-doc:: drivers/gpu/drm/drm_sysfs.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_sysfs.c
+   :export:
+
+
 VBlank event handling
 =====================
 
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 513288b5c2f6..1c5b5ce1fd7f 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -25,6 +25,20 @@
 #define to_drm_minor(d) dev_get_drvdata(d)
 #define to_drm_connector(d) dev_get_drvdata(d)
 
+/**
+ * DOC: overview
+ *
+ * DRM provides very little additional support to drivers for sysfs
+ * interactions, beyond just all the standard stuff. Drivers who want to expose
+ * additional sysfs properties and property groups can attach them at either
+ * &drm_device.dev or &drm_connector.kdev.
+ *
+ * Registration is automatically handled when calling drm_dev_register(), or
+ * drm_connector_register() in case of hot-plugged connectors. Unregistration is
+ * also automatically handled by drm_dev_unregister() and
+ * drm_connector_unregister().
+ */
+
 static struct device_type drm_sysfs_device_minor = {
 	.name = "drm_minor"
 };
@@ -250,15 +264,6 @@ static const struct attribute_group *connector_dev_groups[] = {
 	NULL
 };
 
-/**
- * drm_sysfs_connector_add - add a connector to sysfs
- * @connector: connector to add
- *
- * Create a connector device in sysfs, along with its associated connector
- * properties (so far, connection status, dpms, mode list and edid) and
- * generate a hotplug event so userspace knows there's a new connector
- * available.
- */
 int drm_sysfs_connector_add(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
@@ -285,19 +290,6 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
 	return 0;
 }
 
-/**
- * drm_sysfs_connector_remove - remove an connector device from sysfs
- * @connector: connector to remove
- *
- * Remove @connector and its associated attributes from sysfs.  Note that
- * the device model core will take care of sending the "remove" uevent
- * at this time, so we don't need to do it.
- *
- * Note:
- * This routine should only be called if the connector was previously
- * successfully registered.  If @connector hasn't been registered yet,
- * you'll likely see a panic somewhere deep in sysfs code when called.
- */
 void drm_sysfs_connector_remove(struct drm_connector *connector)
 {
 	if (!connector->kdev)
@@ -333,20 +325,6 @@ static void drm_sysfs_release(struct device *dev)
 	kfree(dev);
 }
 
-/**
- * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
- * @minor: minor to allocate sysfs device for
- *
- * This allocates a new sysfs device for @minor and returns it. The device is
- * not registered nor linked. The caller has to use device_add() and
- * device_del() to register and unregister it.
- *
- * Note that dev_get_drvdata() on the new device will return the minor.
- * However, the device does not hold a ref-count to the minor nor to the
- * underlying drm_device. This is unproblematic as long as you access the
- * private data only in sysfs callbacks. device_del() disables those
- * synchronously, so they cannot be called after you cleanup a minor.
- */
 struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
 {
 	const char *minor_str;
@@ -384,15 +362,13 @@ struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
 }
 
 /**
- * drm_class_device_register - Register a struct device in the drm class.
+ * drm_class_device_register - register new device with the DRM sysfs class
+ * @dev: device to register
  *
- * @dev: pointer to struct device to register.
- *
- * @dev should have all relevant members pre-filled with the exception
- * of the class member. In particular, the device_type member must
- * be set.
+ * Registers a new &struct device within the DRM sysfs class. Essentially only
+ * used by ttm to have a place for its global settings. Drivers should never use
+ * this.
  */
-
 int drm_class_device_register(struct device *dev)
 {
 	if (!drm_class || IS_ERR(drm_class))
@@ -403,6 +379,14 @@ int drm_class_device_register(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(drm_class_device_register);
 
+/**
+ * drm_class_device_unregister - unregister device with the DRM sysfs class
+ * @dev: device to unregister
+ *
+ * Unregisters a &struct device from the DRM sysfs class. Essentially only used
+ * by ttm to have a place for its global settings. Drivers should never use
+ * this.
+ */
 void drm_class_device_unregister(struct device *dev)
 {
 	return device_unregister(dev);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 3bfafcdb8710..e1daa4f343cd 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -80,6 +80,7 @@
 #include <drm/drm_file.h>
 #include <drm/drm_debugfs.h>
 #include <drm/drm_ioctl.h>
+#include <drm/drm_sysfs.h>
 
 struct module;
 
@@ -512,10 +513,6 @@ static inline int drm_device_is_unplugged(struct drm_device *dev)
  * DMA quiscent + idle. DMA quiescent usually requires the hardware lock.
  */
 
-			       /* sysfs support (drm_sysfs.c) */
-extern void drm_sysfs_hotplug_event(struct drm_device *dev);
-
-
 /*@}*/
 
 /* returns true if currently okay to sleep */
diff --git a/include/drm/drm_sysfs.h b/include/drm/drm_sysfs.h
index 23418c1f10d1..70c9a1074aca 100644
--- a/include/drm/drm_sysfs.h
+++ b/include/drm/drm_sysfs.h
@@ -1,12 +1,12 @@
 #ifndef _DRM_SYSFS_H_
 #define _DRM_SYSFS_H_
 
-/**
- * This minimalistic include file is intended for users (read TTM) that
- * don't want to include the full drmP.h file.
- */
+struct drm_device;
+struct device;
 
 int drm_class_device_register(struct device *dev);
 void drm_class_device_unregister(struct device *dev);
 
+void drm_sysfs_hotplug_event(struct drm_device *dev);
+
 #endif
-- 
2.11.0

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Re: [PATCH 02/11] drm: Consolidate and document sysfs support

[Neil Armstrong]

On 04/04/2017 11:52 AM, Daniel Vetter wrote:
> - remove docs for internal func, doesn't add value
> - add short overview snippet instead explaining that drivers don't
>   have to bother themselves with reg/unreg concerns
> - drop the ttm comment about drmP.h, drmP.h is disappearing ...
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  Documentation/gpu/drm-uapi.rst | 10 ++++++
>  drivers/gpu/drm/drm_sysfs.c    | 70 ++++++++++++++++--------------------------
>  include/drm/drmP.h             |  5 +--
>  include/drm/drm_sysfs.h        |  8 ++---
>  4 files changed, 42 insertions(+), 51 deletions(-)
> 
> diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
> index 76356c86e358..8b0f0e403f0c 100644
> --- a/Documentation/gpu/drm-uapi.rst
> +++ b/Documentation/gpu/drm-uapi.rst
> @@ -219,6 +219,16 @@ Debugfs Support
>  .. kernel-doc:: drivers/gpu/drm/drm_debugfs.c
>     :export:
>  
> +Sysfs Support
> +=============
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_sysfs.c
> +   :doc: overview
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_sysfs.c
> +   :export:
> +
> +
>  VBlank event handling
>  =====================
>  
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index 513288b5c2f6..1c5b5ce1fd7f 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -25,6 +25,20 @@
>  #define to_drm_minor(d) dev_get_drvdata(d)
>  #define to_drm_connector(d) dev_get_drvdata(d)
>  
> +/**
> + * DOC: overview
> + *
> + * DRM provides very little additional support to drivers for sysfs
> + * interactions, beyond just all the standard stuff. Drivers who want to expose
> + * additional sysfs properties and property groups can attach them at either
> + * &drm_device.dev or &drm_connector.kdev.
> + *
> + * Registration is automatically handled when calling drm_dev_register(), or
> + * drm_connector_register() in case of hot-plugged connectors. Unregistration is
> + * also automatically handled by drm_dev_unregister() and
> + * drm_connector_unregister().
> + */
> +
>  static struct device_type drm_sysfs_device_minor = {
>  	.name = "drm_minor"
>  };
> @@ -250,15 +264,6 @@ static const struct attribute_group *connector_dev_groups[] = {
>  	NULL
>  };
>  
> -/**
> - * drm_sysfs_connector_add - add a connector to sysfs
> - * @connector: connector to add
> - *
> - * Create a connector device in sysfs, along with its associated connector
> - * properties (so far, connection status, dpms, mode list and edid) and
> - * generate a hotplug event so userspace knows there's a new connector
> - * available.
> - */
>  int drm_sysfs_connector_add(struct drm_connector *connector)
>  {
>  	struct drm_device *dev = connector->dev;
> @@ -285,19 +290,6 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
>  	return 0;
>  }
>  
> -/**
> - * drm_sysfs_connector_remove - remove an connector device from sysfs
> - * @connector: connector to remove
> - *
> - * Remove @connector and its associated attributes from sysfs.  Note that
> - * the device model core will take care of sending the "remove" uevent
> - * at this time, so we don't need to do it.
> - *
> - * Note:
> - * This routine should only be called if the connector was previously
> - * successfully registered.  If @connector hasn't been registered yet,
> - * you'll likely see a panic somewhere deep in sysfs code when called.
> - */
>  void drm_sysfs_connector_remove(struct drm_connector *connector)
>  {
>  	if (!connector->kdev)
> @@ -333,20 +325,6 @@ static void drm_sysfs_release(struct device *dev)
>  	kfree(dev);
>  }
>  
> -/**
> - * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
> - * @minor: minor to allocate sysfs device for
> - *
> - * This allocates a new sysfs device for @minor and returns it. The device is
> - * not registered nor linked. The caller has to use device_add() and
> - * device_del() to register and unregister it.
> - *
> - * Note that dev_get_drvdata() on the new device will return the minor.
> - * However, the device does not hold a ref-count to the minor nor to the
> - * underlying drm_device. This is unproblematic as long as you access the
> - * private data only in sysfs callbacks. device_del() disables those
> - * synchronously, so they cannot be called after you cleanup a minor.
> - */
>  struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
>  {
>  	const char *minor_str;
> @@ -384,15 +362,13 @@ struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
>  }
>  
>  /**
> - * drm_class_device_register - Register a struct device in the drm class.
> + * drm_class_device_register - register new device with the DRM sysfs class
> + * @dev: device to register
>   *
> - * @dev: pointer to struct device to register.
> - *
> - * @dev should have all relevant members pre-filled with the exception
> - * of the class member. In particular, the device_type member must
> - * be set.
> + * Registers a new &struct device within the DRM sysfs class. Essentially only
> + * used by ttm to have a place for its global settings. Drivers should never use
> + * this.
>   */
> -
>  int drm_class_device_register(struct device *dev)
>  {
>  	if (!drm_class || IS_ERR(drm_class))
> @@ -403,6 +379,14 @@ int drm_class_device_register(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(drm_class_device_register);
>  
> +/**
> + * drm_class_device_unregister - unregister device with the DRM sysfs class
> + * @dev: device to unregister
> + *
> + * Unregisters a &struct device from the DRM sysfs class. Essentially only used
> + * by ttm to have a place for its global settings. Drivers should never use
> + * this.
> + */
>  void drm_class_device_unregister(struct device *dev)
>  {
>  	return device_unregister(dev);
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 3bfafcdb8710..e1daa4f343cd 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -80,6 +80,7 @@
>  #include <drm/drm_file.h>
>  #include <drm/drm_debugfs.h>
>  #include <drm/drm_ioctl.h>
> +#include <drm/drm_sysfs.h>
>  
>  struct module;
>  
> @@ -512,10 +513,6 @@ static inline int drm_device_is_unplugged(struct drm_device *dev)
>   * DMA quiscent + idle. DMA quiescent usually requires the hardware lock.
>   */
>  
> -			       /* sysfs support (drm_sysfs.c) */
> -extern void drm_sysfs_hotplug_event(struct drm_device *dev);
> -
> -
>  /*@}*/
>  
>  /* returns true if currently okay to sleep */
> diff --git a/include/drm/drm_sysfs.h b/include/drm/drm_sysfs.h
> index 23418c1f10d1..70c9a1074aca 100644
> --- a/include/drm/drm_sysfs.h
> +++ b/include/drm/drm_sysfs.h
> @@ -1,12 +1,12 @@
>  #ifndef _DRM_SYSFS_H_
>  #define _DRM_SYSFS_H_
>  
> -/**
> - * This minimalistic include file is intended for users (read TTM) that
> - * don't want to include the full drmP.h file.
> - */
> +struct drm_device;
> +struct device;
>  
>  int drm_class_device_register(struct device *dev);
>  void drm_class_device_unregister(struct device *dev);
>  
> +void drm_sysfs_hotplug_event(struct drm_device *dev);
> +
>  #endif
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
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[PATCH 03/11] drm: Extract drm_ioctl.h

[Daniel Vetter]

To match the drm_ioctl.c we already have.

v2: Remove spurious space (Ville).

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 include/drm/drmP.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index e1daa4f343cd..a5ddc2815bf4 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -81,6 +81,7 @@
 #include <drm/drm_debugfs.h>
 #include <drm/drm_ioctl.h>
 #include <drm/drm_sysfs.h>
+#include <drm/drm_ioctl.h>
 
 struct module;
 
-- 
2.11.0

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Re: [PATCH 03/11] drm: Extract drm_ioctl.h

[Neil Armstrong]

On 04/04/2017 11:52 AM, Daniel Vetter wrote:
> To match the drm_ioctl.c we already have.
> 
> v2: Remove spurious space (Ville).
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  include/drm/drmP.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index e1daa4f343cd..a5ddc2815bf4 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -81,6 +81,7 @@
>  #include <drm/drm_debugfs.h>
>  #include <drm/drm_ioctl.h>
>  #include <drm/drm_sysfs.h>
> +#include <drm/drm_ioctl.h>
>  
>  struct module;
>  
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
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Re: [PATCH 03/11] drm: Extract drm_ioctl.h

[Daniel Vetter]

On Tue, Apr 04, 2017 at 04:46:06PM +0200, Neil Armstrong wrote:
> On 04/04/2017 11:52 AM, Daniel Vetter wrote:
> > To match the drm_ioctl.c we already have.
> > 
> > v2: Remove spurious space (Ville).
> > 
> > Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > ---
> >  include/drm/drmP.h | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> > index e1daa4f343cd..a5ddc2815bf4 100644
> > --- a/include/drm/drmP.h
> > +++ b/include/drm/drmP.h
> > @@ -81,6 +81,7 @@
> >  #include <drm/drm_debugfs.h>
> >  #include <drm/drm_ioctl.h>
> >  #include <drm/drm_sysfs.h>
> > +#include <drm/drm_ioctl.h>

This is rebase fail, drm_ioctl.h is already included.

> >  struct module;
> >  
> > 
> 
> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

You might want to retract that r-b ... :-)
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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[PATCH 04/11] drm: document drm_ioctl.[hc]

[Daniel Vetter]

Also unify/merge with the existing stuff.

I was a bit torn where to put this, but in the end I decided to put
all the ioctl/sysfs/debugfs stuff into drm-uapi.rst. That means we
have a bit a split with the other uapi related stuff used internally,
like drm_file.[hc], but I think overall this makes more sense.

If it's too confusing we can always add more cross-links to make it
more discoverable. But the auto-sprinkling of links kernel-doc already
does seems sufficient.

Also for prettier docs and more cross-links, switch the internal
defines over to an enum, as usual.

v2: Update kerneldoc fro drm_compat_ioctl too (caught by 0day), plus a
bit more drive-by polish.

v3: Fix typo, spotted by xerpi on irc (Sergi).

Cc: Sergi Granell <xerpi.g.12@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 Documentation/gpu/drm-internals.rst |  50 ----------------
 Documentation/gpu/drm-uapi.rst      |  14 +++++
 drivers/gpu/drm/drm_ioc32.c         |  76 ++++++++++++-----------
 drivers/gpu/drm/drm_ioctl.c         |  50 +++++++++++++++-
 include/drm/drm_ioctl.h             | 116 +++++++++++++++++++++++++++++++-----
 5 files changed, 203 insertions(+), 103 deletions(-)

diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst
index a09c721f9e89..babfb6143bd9 100644
--- a/Documentation/gpu/drm-internals.rst
+++ b/Documentation/gpu/drm-internals.rst
@@ -255,56 +255,6 @@ File Operations
 .. kernel-doc:: drivers/gpu/drm/drm_file.c
    :export:
 
-IOCTLs
-------
-
-struct drm_ioctl_desc \*ioctls; int num_ioctls;
-    Driver-specific ioctls descriptors table.
-
-Driver-specific ioctls numbers start at DRM_COMMAND_BASE. The ioctls
-descriptors table is indexed by the ioctl number offset from the base
-value. Drivers can use the DRM_IOCTL_DEF_DRV() macro to initialize
-the table entries.
-
-::
-
-    DRM_IOCTL_DEF_DRV(ioctl, func, flags)
-
-``ioctl`` is the ioctl name. Drivers must define the DRM_##ioctl and
-DRM_IOCTL_##ioctl macros to the ioctl number offset from
-DRM_COMMAND_BASE and the ioctl number respectively. The first macro is
-private to the device while the second must be exposed to userspace in a
-public header.
-
-``func`` is a pointer to the ioctl handler function compatible with the
-``drm_ioctl_t`` type.
-
-::
-
-    typedef int drm_ioctl_t(struct drm_device *dev, void *data,
-            struct drm_file *file_priv);
-
-``flags`` is a bitmask combination of the following values. It restricts
-how the ioctl is allowed to be called.
-
--  DRM_AUTH - Only authenticated callers allowed
-
--  DRM_MASTER - The ioctl can only be called on the master file handle
-
--  DRM_ROOT_ONLY - Only callers with the SYSADMIN capability allowed
-
--  DRM_CONTROL_ALLOW - The ioctl can only be called on a control
-   device
-
--  DRM_UNLOCKED - The ioctl handler will be called without locking the
-   DRM global mutex. This is the enforced default for kms drivers (i.e.
-   using the DRIVER_MODESET flag) and hence shouldn't be used any more
-   for new drivers.
-
-.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
-   :export:
-
-
 Misc Utilities
 ==============
 
diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
index 8b0f0e403f0c..858457567d3d 100644
--- a/Documentation/gpu/drm-uapi.rst
+++ b/Documentation/gpu/drm-uapi.rst
@@ -160,6 +160,20 @@ other hand, a driver requires shared state between clients which is
 visible to user-space and accessible beyond open-file boundaries, they
 cannot support render nodes.
 
+IOCTL Support on Device Nodes
+=============================
+
+.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
+   :doc: driver specific ioctls
+
+.. kernel-doc:: include/drm/drm_ioctl.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/drm_ioc32.c
+   :export:
 
 Testing and validation
 ======================
diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c
index b134482f4022..0fa7827cb0fd 100644
--- a/drivers/gpu/drm/drm_ioc32.c
+++ b/drivers/gpu/drm/drm_ioc32.c
@@ -1,4 +1,4 @@
-/**
+/*
  * \file drm_ioc32.c
  *
  * 32-bit ioctl compatibility routines for the DRM.
@@ -72,15 +72,15 @@
 #define DRM_IOCTL_MODE_ADDFB232		DRM_IOWR(0xb8, drm_mode_fb_cmd232_t)
 
 typedef struct drm_version_32 {
-	int version_major;	  /**< Major version */
-	int version_minor;	  /**< Minor version */
-	int version_patchlevel;	   /**< Patch level */
-	u32 name_len;		  /**< Length of name buffer */
-	u32 name;		  /**< Name of driver */
-	u32 date_len;		  /**< Length of date buffer */
-	u32 date;		  /**< User-space buffer to hold date */
-	u32 desc_len;		  /**< Length of desc buffer */
-	u32 desc;		  /**< User-space buffer to hold desc */
+	int version_major;	  /* Major version */
+	int version_minor;	  /* Minor version */
+	int version_patchlevel;	   /* Patch level */
+	u32 name_len;		  /* Length of name buffer */
+	u32 name;		  /* Name of driver */
+	u32 date_len;		  /* Length of date buffer */
+	u32 date;		  /* User-space buffer to hold date */
+	u32 desc_len;		  /* Length of desc buffer */
+	u32 desc;		  /* User-space buffer to hold desc */
 } drm_version32_t;
 
 static int compat_drm_version(struct file *file, unsigned int cmd,
@@ -126,8 +126,8 @@ static int compat_drm_version(struct file *file, unsigned int cmd,
 }
 
 typedef struct drm_unique32 {
-	u32 unique_len;	/**< Length of unique */
-	u32 unique;	/**< Unique name for driver instantiation */
+	u32 unique_len;	/* Length of unique */
+	u32 unique;	/* Unique name for driver instantiation */
 } drm_unique32_t;
 
 static int compat_drm_getunique(struct file *file, unsigned int cmd,
@@ -180,12 +180,12 @@ static int compat_drm_setunique(struct file *file, unsigned int cmd,
 }
 
 typedef struct drm_map32 {
-	u32 offset;		/**< Requested physical address (0 for SAREA)*/
-	u32 size;		/**< Requested physical size (bytes) */
-	enum drm_map_type type;	/**< Type of memory to map */
-	enum drm_map_flags flags;	/**< Flags */
-	u32 handle;		/**< User-space: "Handle" to pass to mmap() */
-	int mtrr;		/**< MTRR slot used */
+	u32 offset;		/* Requested physical address (0 for SAREA)*/
+	u32 size;		/* Requested physical size (bytes) */
+	enum drm_map_type type;	/* Type of memory to map */
+	enum drm_map_flags flags;	/* Flags */
+	u32 handle;		/* User-space: "Handle" to pass to mmap() */
+	int mtrr;		/* MTRR slot used */
 } drm_map32_t;
 
 static int compat_drm_getmap(struct file *file, unsigned int cmd,
@@ -286,12 +286,12 @@ static int compat_drm_rmmap(struct file *file, unsigned int cmd,
 }
 
 typedef struct drm_client32 {
-	int idx;	/**< Which client desired? */
-	int auth;	/**< Is client authenticated? */
-	u32 pid;	/**< Process ID */
-	u32 uid;	/**< User ID */
-	u32 magic;	/**< Magic */
-	u32 iocs;	/**< Ioctl count */
+	int idx;	/* Which client desired? */
+	int auth;	/* Is client authenticated? */
+	u32 pid;	/* Process ID */
+	u32 uid;	/* User ID */
+	u32 magic;	/* Magic */
+	u32 iocs;	/* Ioctl count */
 } drm_client32_t;
 
 static int compat_drm_getclient(struct file *file, unsigned int cmd,
@@ -366,12 +366,12 @@ static int compat_drm_getstats(struct file *file, unsigned int cmd,
 }
 
 typedef struct drm_buf_desc32 {
-	int count;		 /**< Number of buffers of this size */
-	int size;		 /**< Size in bytes */
-	int low_mark;		 /**< Low water mark */
-	int high_mark;		 /**< High water mark */
+	int count;		 /* Number of buffers of this size */
+	int size;		 /* Size in bytes */
+	int low_mark;		 /* Low water mark */
+	int high_mark;		 /* High water mark */
 	int flags;
-	u32 agp_start;		 /**< Start address in the AGP aperture */
+	u32 agp_start;		 /* Start address in the AGP aperture */
 } drm_buf_desc32_t;
 
 static int compat_drm_addbufs(struct file *file, unsigned int cmd,
@@ -1111,13 +1111,18 @@ static drm_ioctl_compat_t *drm_compat_ioctls[] = {
 };
 
 /**
- * Called whenever a 32-bit process running under a 64-bit kernel
- * performs an ioctl on /dev/drm.
+ * drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers
+ * @filp: file this ioctl is called on
+ * @cmd: ioctl cmd number
+ * @arg: user argument
+ *
+ * Compatibility handler for 32 bit userspace running on 64 kernels. All actual
+ * IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as
+ * appropriate. Note that this only handles DRM core IOCTLs, if the driver has
+ * botched IOCTL itself, it must handle those by wrapping this function.
  *
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg user argument.
- * \return zero on success or negative number on failure.
+ * Returns:
+ * Zero on success, negative error code on failure.
  */
 long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
@@ -1141,5 +1146,4 @@ long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 
 	return ret;
 }
-
 EXPORT_SYMBOL(drm_compat_ioctl);
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 7f4f4f48e390..f908ea94b784 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -647,13 +647,59 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
 #define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )
 
 /**
+ * DOC: driver specific ioctls
+ *
+ * First things first, driver private IOCTLs should only be needed for drivers
+ * supporting rendering. Kernel modesetting is all standardized, and extended
+ * through properties. There are a few exceptions in some existing drivers,
+ * which define IOCTL for use by the display DRM master, but they all predate
+ * properties.
+ *
+ * Now if you do have a render driver you always have to support it through
+ * driver private properties. There's a few steps needed to wire all the things
+ * up.
+ *
+ * First you need to define the structure for your IOCTL in your driver private
+ * UAPI header in ``include/uapi/drm/my_driver_drm.h``::
+ *
+ *     struct my_driver_operation {
+ *             u32 some_thing;
+ *             u32 another_thing;
+ *     };
+ *
+ * Please make sure that you follow all the best practices from
+ * ``Documentation/ioctl/botching-up-ioctls.txt``. Note that drm_ioctl()
+ * automatically zero-extends structures, hence make sure you can add more stuff
+ * at the end, i.e. don't put a variable sized array there.
+ *
+ * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(),
+ * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix::
+ *
+ *     ##define DRM_IOCTL_MY_DRIVER_OPERATION \
+ *         DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation)
+ * 
+ * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to
+ * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire
+ * up the handlers and set the access rights:
+ *
+ *     static const struct drm_ioctl_desc my_driver_ioctls[] = {
+ *         DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation,
+ *                 DRM_AUTH|DRM_RENDER_ALLOW),
+ *     };
+ *
+ * And then assign this to the &drm_driver.ioctls field in your driver
+ * structure.
+ */
+
+/**
  * drm_ioctl - ioctl callback implementation for DRM drivers
  * @filp: file this ioctl is called on
  * @cmd: ioctl cmd number
  * @arg: user argument
  *
- * Looks up the ioctl function in the ::ioctls table, checking for root
- * previleges if so required, and dispatches to the respective function.
+ * Looks up the ioctl function in the DRM core and the driver dispatch table,
+ * stored in &drm_driver.ioctls. It checks for necessary permission by calling
+ * drm_ioctl_permit(), and dispatches to the respective function.
  *
  * Returns:
  * Zero on success, negative error code on failure.
diff --git a/include/drm/drm_ioctl.h b/include/drm/drm_ioctl.h
index f17ee077f649..ee03b3c44b3b 100644
--- a/include/drm/drm_ioctl.h
+++ b/include/drm/drm_ioctl.h
@@ -33,6 +33,7 @@
 #define _DRM_IOCTL_H_
 
 #include <linux/types.h>
+#include <linux/bitops.h>
 
 #include <asm/ioctl.h>
 
@@ -41,41 +42,126 @@ struct drm_file;
 struct file;
 
 /**
- * Ioctl function type.
+ * drm_ioctl_t - DRM ioctl function type.
+ * @dev: DRM device inode
+ * @data: private pointer of the ioctl call
+ * @file_priv: DRM file this ioctl was made on
  *
- * \param inode device inode.
- * \param file_priv DRM file private pointer.
- * \param cmd command.
- * \param arg argument.
+ * This is the DRM ioctl typedef. Note that drm_ioctl() has alrady copied @data
+ * into kernel-space, and will also copy it back, depending upon the read/write
+ * settings in the ioctl command code.
  */
 typedef int drm_ioctl_t(struct drm_device *dev, void *data,
 			struct drm_file *file_priv);
 
+/**
+ * drm_ioctl_compat_t - compatibility DRM ioctl function type.
+ * @filp: file pointer
+ * @cmd: ioctl command code
+ * @arg: DRM file this ioctl was made on
+ *
+ * Just a typedef to make declaring an array of compatibility handlers easier.
+ * New drivers shouldn't screw up the structure layout for their ioctl
+ * structures and hence never need this.
+ */
 typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
 			       unsigned long arg);
 
 #define DRM_IOCTL_NR(n)                _IOC_NR(n)
 #define DRM_MAJOR       226
 
-#define DRM_AUTH	0x1
-#define	DRM_MASTER	0x2
-#define DRM_ROOT_ONLY	0x4
-#define DRM_CONTROL_ALLOW 0x8
-#define DRM_UNLOCKED	0x10
-#define DRM_RENDER_ALLOW 0x20
+/**
+ * enum drm_ioctl_flags - DRM ioctl flags
+ *
+ * Various flags that can be set in &drm_ioctl_desc.flags to control how
+ * userspace can use a given ioctl.
+ */
+enum drm_ioctl_flags {
+	/**
+	 * @DRM_AUTH:
+	 *
+	 * This is for ioctl which are used for rendering, and require that the
+	 * file descriptor is either for a render node, or if it's a
+	 * legacy/primary node, then it must be authenticated.
+	 */
+	DRM_AUTH		= BIT(0),
+	/**
+	 * @DRM_MASTER:
+	 *
+	 * This must be set for any ioctl which can change the modeset or
+	 * display state. Userspace must call the ioctl through a primary node,
+	 * while it is the active master.
+	 *
+	 * Note that read-only modeset ioctl can also be called by
+	 * unauthenticated clients, or when a master is not the currently active
+	 * one.
+	 */
+	DRM_MASTER		= BIT(1),
+	/**
+	 * @DRM_ROOT_ONLY:
+	 *
+	 * Anything that could potentially wreak a master file descriptor needs
+	 * to have this flag set. Current that's only for the SETMASTER and
+	 * DROPMASTER ioctl, which e.g. logind can call to force a non-behaving
+	 * master (display compositor) into compliance.
+	 *
+	 * This is equivalent to callers with the SYSADMIN capability.
+	 */
+	DRM_ROOT_ONLY		= BIT(2),
+	/**
+	 * @DRM_CONTROL_ALLOW:
+	 *
+	 * Deprecated, do not use. Control nodes are in the process of getting
+	 * removed.
+	 */
+	DRM_CONTROL_ALLOW	= BIT(3),
+	/**
+	 * @DRM_UNLOCKED:
+	 *
+	 * Whether &drm_ioctl_desc.func should be called with the DRM BKL held
+	 * or not. Enforced as the default for all modern drivers, hence there
+	 * should never be a need to set this flag.
+	 */
+	DRM_UNLOCKED		= BIT(4),
+	/**
+	 * @DRM_RENDER_ALLOW:
+	 *
+	 * This is used for all ioctl needed for rendering only, for drivers
+	 * which support render nodes. This should be all new render drivers,
+	 * and hence it should be always set for any ioctl with DRM_AUTH set.
+	 * Note though that read-only query ioctl might have this set, but have
+	 * not set DRM_AUTH because they do not require authentication.
+	 */
+	DRM_RENDER_ALLOW	= BIT(5),
+};
 
+/**
+ * struct drm_ioctl_desc - DRM driver ioctl entry
+ * @cmd: ioctl command number, without flags
+ * @flags: a bitmask of &enum drm_ioctl_flags
+ * @func: handler for this ioctl
+ * @name: user-readable name for debug output
+ *
+ * For convenience it's easier to create these using the DRM_IOCTL_DEF_DRV()
+ * macro.
+ */
 struct drm_ioctl_desc {
 	unsigned int cmd;
-	int flags;
+	enum drm_ioctl_flags flags;
 	drm_ioctl_t *func;
 	const char *name;
 };
 
 /**
- * Creates a driver or general drm_ioctl_desc array entry for the given
- * ioctl, for use by drm_ioctl().
+ * DRM_IOCTL_DEF_DRV() - helper macro to fill out a &struct drm_ioctl_desc
+ * @ioctl: ioctl command suffix
+ * @_func: handler for the ioctl
+ * @_flags: a bitmask of &enum drm_ioctl_flags
+ *
+ * Small helper macro to create a &struct drm_ioctl_desc entry. The ioctl
+ * command number is constructed by prepending ``DRM_IOCTL\_`` and passing that
+ * to DRM_IOCTL_NR().
  */
-
 #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)				\
 	[DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = {	\
 		.cmd = DRM_IOCTL_##ioctl,				\
-- 
2.11.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 04/11] drm: document drm_ioctl.[hc]

[Neil Armstrong]

On 04/04/2017 11:52 AM, Daniel Vetter wrote:
> Also unify/merge with the existing stuff.
> 
> I was a bit torn where to put this, but in the end I decided to put
> all the ioctl/sysfs/debugfs stuff into drm-uapi.rst. That means we
> have a bit a split with the other uapi related stuff used internally,
> like drm_file.[hc], but I think overall this makes more sense.
> 
> If it's too confusing we can always add more cross-links to make it
> more discoverable. But the auto-sprinkling of links kernel-doc already
> does seems sufficient.
> 
> Also for prettier docs and more cross-links, switch the internal
> defines over to an enum, as usual.
> 
> v2: Update kerneldoc fro drm_compat_ioctl too (caught by 0day), plus a
> bit more drive-by polish.
> 
> v3: Fix typo, spotted by xerpi on irc (Sergi).
> 
> Cc: Sergi Granell <xerpi.g.12@gmail.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  Documentation/gpu/drm-internals.rst |  50 ----------------
>  Documentation/gpu/drm-uapi.rst      |  14 +++++
>  drivers/gpu/drm/drm_ioc32.c         |  76 ++++++++++++-----------
>  drivers/gpu/drm/drm_ioctl.c         |  50 +++++++++++++++-
>  include/drm/drm_ioctl.h             | 116 +++++++++++++++++++++++++++++++-----
>  5 files changed, 203 insertions(+), 103 deletions(-)
> 
> diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst
> index a09c721f9e89..babfb6143bd9 100644
> --- a/Documentation/gpu/drm-internals.rst
> +++ b/Documentation/gpu/drm-internals.rst
> @@ -255,56 +255,6 @@ File Operations
>  .. kernel-doc:: drivers/gpu/drm/drm_file.c
>     :export:
>  
> -IOCTLs
> -------
> -
> -struct drm_ioctl_desc \*ioctls; int num_ioctls;
> -    Driver-specific ioctls descriptors table.
> -
> -Driver-specific ioctls numbers start at DRM_COMMAND_BASE. The ioctls
> -descriptors table is indexed by the ioctl number offset from the base
> -value. Drivers can use the DRM_IOCTL_DEF_DRV() macro to initialize
> -the table entries.
> -
> -::
> -
> -    DRM_IOCTL_DEF_DRV(ioctl, func, flags)
> -
> -``ioctl`` is the ioctl name. Drivers must define the DRM_##ioctl and
> -DRM_IOCTL_##ioctl macros to the ioctl number offset from
> -DRM_COMMAND_BASE and the ioctl number respectively. The first macro is
> -private to the device while the second must be exposed to userspace in a
> -public header.
> -
> -``func`` is a pointer to the ioctl handler function compatible with the
> -``drm_ioctl_t`` type.
> -
> -::
> -
> -    typedef int drm_ioctl_t(struct drm_device *dev, void *data,
> -            struct drm_file *file_priv);
> -
> -``flags`` is a bitmask combination of the following values. It restricts
> -how the ioctl is allowed to be called.
> -
> --  DRM_AUTH - Only authenticated callers allowed
> -
> --  DRM_MASTER - The ioctl can only be called on the master file handle
> -
> --  DRM_ROOT_ONLY - Only callers with the SYSADMIN capability allowed
> -
> --  DRM_CONTROL_ALLOW - The ioctl can only be called on a control
> -   device
> -
> --  DRM_UNLOCKED - The ioctl handler will be called without locking the
> -   DRM global mutex. This is the enforced default for kms drivers (i.e.
> -   using the DRIVER_MODESET flag) and hence shouldn't be used any more
> -   for new drivers.
> -
> -.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
> -   :export:
> -
> -
>  Misc Utilities
>  ==============
>  
> diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
> index 8b0f0e403f0c..858457567d3d 100644
> --- a/Documentation/gpu/drm-uapi.rst
> +++ b/Documentation/gpu/drm-uapi.rst
> @@ -160,6 +160,20 @@ other hand, a driver requires shared state between clients which is
>  visible to user-space and accessible beyond open-file boundaries, they
>  cannot support render nodes.
>  
> +IOCTL Support on Device Nodes
> +=============================
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
> +   :doc: driver specific ioctls
> +
> +.. kernel-doc:: include/drm/drm_ioctl.h
> +   :internal:
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
> +   :export:
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_ioc32.c
> +   :export:
>  
>  Testing and validation
>  ======================
> diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c
> index b134482f4022..0fa7827cb0fd 100644
> --- a/drivers/gpu/drm/drm_ioc32.c
> +++ b/drivers/gpu/drm/drm_ioc32.c
> @@ -1,4 +1,4 @@
> -/**
> +/*
>   * \file drm_ioc32.c
>   *
>   * 32-bit ioctl compatibility routines for the DRM.
> @@ -72,15 +72,15 @@
>  #define DRM_IOCTL_MODE_ADDFB232		DRM_IOWR(0xb8, drm_mode_fb_cmd232_t)
>  
>  typedef struct drm_version_32 {
> -	int version_major;	  /**< Major version */
> -	int version_minor;	  /**< Minor version */
> -	int version_patchlevel;	   /**< Patch level */
> -	u32 name_len;		  /**< Length of name buffer */
> -	u32 name;		  /**< Name of driver */
> -	u32 date_len;		  /**< Length of date buffer */
> -	u32 date;		  /**< User-space buffer to hold date */
> -	u32 desc_len;		  /**< Length of desc buffer */
> -	u32 desc;		  /**< User-space buffer to hold desc */
> +	int version_major;	  /* Major version */
> +	int version_minor;	  /* Minor version */
> +	int version_patchlevel;	   /* Patch level */
> +	u32 name_len;		  /* Length of name buffer */
> +	u32 name;		  /* Name of driver */
> +	u32 date_len;		  /* Length of date buffer */
> +	u32 date;		  /* User-space buffer to hold date */
> +	u32 desc_len;		  /* Length of desc buffer */
> +	u32 desc;		  /* User-space buffer to hold desc */
>  } drm_version32_t;
>  
>  static int compat_drm_version(struct file *file, unsigned int cmd,
> @@ -126,8 +126,8 @@ static int compat_drm_version(struct file *file, unsigned int cmd,
>  }
>  
>  typedef struct drm_unique32 {
> -	u32 unique_len;	/**< Length of unique */
> -	u32 unique;	/**< Unique name for driver instantiation */
> +	u32 unique_len;	/* Length of unique */
> +	u32 unique;	/* Unique name for driver instantiation */
>  } drm_unique32_t;
>  
>  static int compat_drm_getunique(struct file *file, unsigned int cmd,
> @@ -180,12 +180,12 @@ static int compat_drm_setunique(struct file *file, unsigned int cmd,
>  }
>  
>  typedef struct drm_map32 {
> -	u32 offset;		/**< Requested physical address (0 for SAREA)*/
> -	u32 size;		/**< Requested physical size (bytes) */
> -	enum drm_map_type type;	/**< Type of memory to map */
> -	enum drm_map_flags flags;	/**< Flags */
> -	u32 handle;		/**< User-space: "Handle" to pass to mmap() */
> -	int mtrr;		/**< MTRR slot used */
> +	u32 offset;		/* Requested physical address (0 for SAREA)*/
									  /\
Missing space here

> +	u32 size;		/* Requested physical size (bytes) */
> +	enum drm_map_type type;	/* Type of memory to map */
> +	enum drm_map_flags flags;	/* Flags */
> +	u32 handle;		/* User-space: "Handle" to pass to mmap() */
> +	int mtrr;		/* MTRR slot used */
>  } drm_map32_t;
>  
>  static int compat_drm_getmap(struct file *file, unsigned int cmd,
> @@ -286,12 +286,12 @@ static int compat_drm_rmmap(struct file *file, unsigned int cmd,
>  }
>  
>  typedef struct drm_client32 {
> -	int idx;	/**< Which client desired? */
> -	int auth;	/**< Is client authenticated? */
> -	u32 pid;	/**< Process ID */
> -	u32 uid;	/**< User ID */
> -	u32 magic;	/**< Magic */
> -	u32 iocs;	/**< Ioctl count */
> +	int idx;	/* Which client desired? */
> +	int auth;	/* Is client authenticated? */
> +	u32 pid;	/* Process ID */
> +	u32 uid;	/* User ID */
> +	u32 magic;	/* Magic */
> +	u32 iocs;	/* Ioctl count */
>  } drm_client32_t;
>  
>  static int compat_drm_getclient(struct file *file, unsigned int cmd,
> @@ -366,12 +366,12 @@ static int compat_drm_getstats(struct file *file, unsigned int cmd,
>  }
>  
>  typedef struct drm_buf_desc32 {
> -	int count;		 /**< Number of buffers of this size */
> -	int size;		 /**< Size in bytes */
> -	int low_mark;		 /**< Low water mark */
> -	int high_mark;		 /**< High water mark */
> +	int count;		 /* Number of buffers of this size */
> +	int size;		 /* Size in bytes */
> +	int low_mark;		 /* Low water mark */
> +	int high_mark;		 /* High water mark */
>  	int flags;
> -	u32 agp_start;		 /**< Start address in the AGP aperture */
> +	u32 agp_start;		 /* Start address in the AGP aperture */
>  } drm_buf_desc32_t;
>  
>  static int compat_drm_addbufs(struct file *file, unsigned int cmd,
> @@ -1111,13 +1111,18 @@ static drm_ioctl_compat_t *drm_compat_ioctls[] = {
>  };
>  
>  /**
> - * Called whenever a 32-bit process running under a 64-bit kernel
> - * performs an ioctl on /dev/drm.
> + * drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers
> + * @filp: file this ioctl is called on
> + * @cmd: ioctl cmd number
> + * @arg: user argument
> + *
> + * Compatibility handler for 32 bit userspace running on 64 kernels. All actual
> + * IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as
> + * appropriate. Note that this only handles DRM core IOCTLs, if the driver has
> + * botched IOCTL itself, it must handle those by wrapping this function.
>   *
> - * \param file_priv DRM file private.
> - * \param cmd command.
> - * \param arg user argument.
> - * \return zero on success or negative number on failure.
> + * Returns:
> + * Zero on success, negative error code on failure.
>   */
>  long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  {
> @@ -1141,5 +1146,4 @@ long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  
>  	return ret;
>  }
> -
>  EXPORT_SYMBOL(drm_compat_ioctl);
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index 7f4f4f48e390..f908ea94b784 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -647,13 +647,59 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
>  #define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )
>  
>  /**
> + * DOC: driver specific ioctls
> + *
> + * First things first, driver private IOCTLs should only be needed for drivers
> + * supporting rendering. Kernel modesetting is all standardized, and extended
> + * through properties. There are a few exceptions in some existing drivers,
> + * which define IOCTL for use by the display DRM master, but they all predate
> + * properties.
> + *
> + * Now if you do have a render driver you always have to support it through
> + * driver private properties. There's a few steps needed to wire all the things
> + * up.
> + *
> + * First you need to define the structure for your IOCTL in your driver private
> + * UAPI header in ``include/uapi/drm/my_driver_drm.h``::
> + *
> + *     struct my_driver_operation {
> + *             u32 some_thing;
> + *             u32 another_thing;
> + *     };
> + *
> + * Please make sure that you follow all the best practices from
> + * ``Documentation/ioctl/botching-up-ioctls.txt``. Note that drm_ioctl()
> + * automatically zero-extends structures, hence make sure you can add more stuff
> + * at the end, i.e. don't put a variable sized array there.
> + *
> + * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(),
> + * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix::
> + *
> + *     ##define DRM_IOCTL_MY_DRIVER_OPERATION \
> + *         DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation)
> + * 
> + * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to
> + * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire
> + * up the handlers and set the access rights:
> + *
> + *     static const struct drm_ioctl_desc my_driver_ioctls[] = {
> + *         DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation,
> + *                 DRM_AUTH|DRM_RENDER_ALLOW),
> + *     };
> + *
> + * And then assign this to the &drm_driver.ioctls field in your driver
> + * structure.
> + */
> +
> +/**
>   * drm_ioctl - ioctl callback implementation for DRM drivers
>   * @filp: file this ioctl is called on
>   * @cmd: ioctl cmd number
>   * @arg: user argument
>   *
> - * Looks up the ioctl function in the ::ioctls table, checking for root
> - * previleges if so required, and dispatches to the respective function.
> + * Looks up the ioctl function in the DRM core and the driver dispatch table,
> + * stored in &drm_driver.ioctls. It checks for necessary permission by calling
> + * drm_ioctl_permit(), and dispatches to the respective function.
>   *
>   * Returns:
>   * Zero on success, negative error code on failure.
> diff --git a/include/drm/drm_ioctl.h b/include/drm/drm_ioctl.h
> index f17ee077f649..ee03b3c44b3b 100644
> --- a/include/drm/drm_ioctl.h
> +++ b/include/drm/drm_ioctl.h
> @@ -33,6 +33,7 @@
>  #define _DRM_IOCTL_H_
>  
>  #include <linux/types.h>
> +#include <linux/bitops.h>
>  
>  #include <asm/ioctl.h>
>  
> @@ -41,41 +42,126 @@ struct drm_file;
>  struct file;
>  
>  /**
> - * Ioctl function type.
> + * drm_ioctl_t - DRM ioctl function type.
> + * @dev: DRM device inode
> + * @data: private pointer of the ioctl call
> + * @file_priv: DRM file this ioctl was made on
>   *
> - * \param inode device inode.
> - * \param file_priv DRM file private pointer.
> - * \param cmd command.
> - * \param arg argument.
> + * This is the DRM ioctl typedef. Note that drm_ioctl() has alrady copied @data
> + * into kernel-space, and will also copy it back, depending upon the read/write
> + * settings in the ioctl command code.
>   */
>  typedef int drm_ioctl_t(struct drm_device *dev, void *data,
>  			struct drm_file *file_priv);
>  
> +/**
> + * drm_ioctl_compat_t - compatibility DRM ioctl function type.
> + * @filp: file pointer
> + * @cmd: ioctl command code
> + * @arg: DRM file this ioctl was made on
> + *
> + * Just a typedef to make declaring an array of compatibility handlers easier.
> + * New drivers shouldn't screw up the structure layout for their ioctl
> + * structures and hence never need this.
> + */
>  typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
>  			       unsigned long arg);
>  
>  #define DRM_IOCTL_NR(n)                _IOC_NR(n)
>  #define DRM_MAJOR       226
>  
> -#define DRM_AUTH	0x1
> -#define	DRM_MASTER	0x2
> -#define DRM_ROOT_ONLY	0x4
> -#define DRM_CONTROL_ALLOW 0x8
> -#define DRM_UNLOCKED	0x10
> -#define DRM_RENDER_ALLOW 0x20
> +/**
> + * enum drm_ioctl_flags - DRM ioctl flags
> + *
> + * Various flags that can be set in &drm_ioctl_desc.flags to control how
> + * userspace can use a given ioctl.
> + */
> +enum drm_ioctl_flags {
> +	/**
> +	 * @DRM_AUTH:
> +	 *
> +	 * This is for ioctl which are used for rendering, and require that the
> +	 * file descriptor is either for a render node, or if it's a
> +	 * legacy/primary node, then it must be authenticated.
> +	 */
> +	DRM_AUTH		= BIT(0),
> +	/**
> +	 * @DRM_MASTER:
> +	 *
> +	 * This must be set for any ioctl which can change the modeset or
> +	 * display state. Userspace must call the ioctl through a primary node,
> +	 * while it is the active master.
> +	 *
> +	 * Note that read-only modeset ioctl can also be called by
> +	 * unauthenticated clients, or when a master is not the currently active
> +	 * one.
> +	 */
> +	DRM_MASTER		= BIT(1),
> +	/**
> +	 * @DRM_ROOT_ONLY:
> +	 *
> +	 * Anything that could potentially wreak a master file descriptor needs
> +	 * to have this flag set. Current that's only for the SETMASTER and
> +	 * DROPMASTER ioctl, which e.g. logind can call to force a non-behaving
> +	 * master (display compositor) into compliance.
> +	 *
> +	 * This is equivalent to callers with the SYSADMIN capability.
> +	 */
> +	DRM_ROOT_ONLY		= BIT(2),
> +	/**
> +	 * @DRM_CONTROL_ALLOW:
> +	 *
> +	 * Deprecated, do not use. Control nodes are in the process of getting
> +	 * removed.
> +	 */
> +	DRM_CONTROL_ALLOW	= BIT(3),
> +	/**
> +	 * @DRM_UNLOCKED:
> +	 *
> +	 * Whether &drm_ioctl_desc.func should be called with the DRM BKL held
> +	 * or not. Enforced as the default for all modern drivers, hence there
> +	 * should never be a need to set this flag.
> +	 */
> +	DRM_UNLOCKED		= BIT(4),
> +	/**
> +	 * @DRM_RENDER_ALLOW:
> +	 *
> +	 * This is used for all ioctl needed for rendering only, for drivers
> +	 * which support render nodes. This should be all new render drivers,
> +	 * and hence it should be always set for any ioctl with DRM_AUTH set.
> +	 * Note though that read-only query ioctl might have this set, but have
> +	 * not set DRM_AUTH because they do not require authentication.
> +	 */
> +	DRM_RENDER_ALLOW	= BIT(5),
> +};
>  
> +/**
> + * struct drm_ioctl_desc - DRM driver ioctl entry
> + * @cmd: ioctl command number, without flags
> + * @flags: a bitmask of &enum drm_ioctl_flags
> + * @func: handler for this ioctl
> + * @name: user-readable name for debug output
> + *
> + * For convenience it's easier to create these using the DRM_IOCTL_DEF_DRV()
> + * macro.
> + */
>  struct drm_ioctl_desc {
>  	unsigned int cmd;
> -	int flags;
> +	enum drm_ioctl_flags flags;
>  	drm_ioctl_t *func;
>  	const char *name;
>  };
>  
>  /**
> - * Creates a driver or general drm_ioctl_desc array entry for the given
> - * ioctl, for use by drm_ioctl().
> + * DRM_IOCTL_DEF_DRV() - helper macro to fill out a &struct drm_ioctl_desc
> + * @ioctl: ioctl command suffix
> + * @_func: handler for the ioctl
> + * @_flags: a bitmask of &enum drm_ioctl_flags
> + *
> + * Small helper macro to create a &struct drm_ioctl_desc entry. The ioctl
> + * command number is constructed by prepending ``DRM_IOCTL\_`` and passing that
> + * to DRM_IOCTL_NR().
>   */
> -
>  #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)				\
>  	[DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = {	\
>  		.cmd = DRM_IOCTL_##ioctl,				\
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH 05/11] drm/vblank: Switch drm_driver->get_vblank_timestamp to return a bool

[Daniel Vetter]

There's really no reason for anything more:
- Calling this while the crtc vblank stuff isn't set up is a driver
  bug. Those places arlready DRM_ERROR.
- Calling this when the crtc is off is either a driver bug (callin
  drm_crtc_handle_vblank at the wrong time) or a core bug (for
  anything else). Again, we DRM_ERROR.
- EINVAL is checked at higher levels already, and if we'd use struct
  drm_crtc * instead of (dev, pipe) it would be real obvious that
  those are again core bugs.

The only valid failure mode is crap hardware that couldn't sample a
useful timestamp, to ask the core to just grab a not-so-accurate
timestampe. Bool is perfectly fine for that.

v2: Also fix up the one caller, I lost that in the shuffling (Jani).

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  8 ++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   | 14 ++++-----
 drivers/gpu/drm/drm_irq.c                 | 49 ++++++++++++-------------------
 drivers/gpu/drm/i915/i915_irq.c           |  8 ++---
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   | 12 ++++----
 drivers/gpu/drm/nouveau/nouveau_display.c |  4 +--
 drivers/gpu/drm/nouveau/nouveau_display.h |  4 +--
 drivers/gpu/drm/radeon/radeon_drv.c       |  8 ++---
 drivers/gpu/drm/radeon/radeon_kms.c       | 14 ++++-----
 drivers/gpu/drm/vc4/vc4_crtc.c            |  2 +-
 drivers/gpu/drm/vc4/vc4_drv.h             |  2 +-
 include/drm/drmP.h                        |  1 -
 include/drm/drm_drv.h                     |  7 ++---
 include/drm/drm_irq.h                     | 10 +++----
 14 files changed, 64 insertions(+), 79 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 262056778f52..0dcc9ee73ab1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1913,10 +1913,10 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon);
 u32 amdgpu_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
 int amdgpu_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
-int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
-				    int *max_error,
-				    struct timeval *vblank_time,
-				    unsigned flags);
+bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
+				     int *max_error,
+				     struct timeval *vblank_time,
+				     unsigned flags);
 long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
 			     unsigned long arg);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index dfb029ab3448..ba937d763df5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -951,19 +951,19 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
  *
  * Gets the timestamp on the requested crtc based on the
  * scanout position.  (all asics).
- * Returns postive status flags on success, negative error on failure.
+ * Returns true on success, false on failure.
  */
-int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
-				    int *max_error,
-				    struct timeval *vblank_time,
-				    unsigned flags)
+bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
+				     int *max_error,
+				     struct timeval *vblank_time,
+				     unsigned flags)
 {
 	struct drm_crtc *crtc;
 	struct amdgpu_device *adev = dev->dev_private;
 
 	if (pipe >= dev->num_crtcs) {
 		DRM_ERROR("Invalid crtc %u\n", pipe);
-		return -EINVAL;
+		return false;
 	}
 
 	/* Get associated drm_crtc: */
@@ -972,7 +972,7 @@ int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 		/* This can occur on driver load if some component fails to
 		 * initialize completely and driver is unloaded */
 		DRM_ERROR("Uninitialized crtc %d\n", pipe);
-		return -EINVAL;
+		return false;
 	}
 
 	/* Helper routine in DRM core does all the work: */
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index dac1b2593cb1..319ab3661965 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -724,43 +724,32 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
  * active. Higher level code is expected to handle this.
  *
  * Returns:
- * Negative value on error, failure or if not supported in current
- * video mode:
- *
- * -EINVAL    Invalid CRTC.
- * -EAGAIN    Temporary unavailable, e.g., called before initial modeset.
- * -ENOTSUPP  Function not supported in current display mode.
- * -EIO       Failed, e.g., due to failed scanout position query.
- *
- * Returns or'ed positive status flags on success:
- *
- * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
- * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
  *
+ * Returns true on success, and false on failure, i.e. when no accurate
+ * timestamp could be acquired.
  */
-int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
-					  unsigned int pipe,
-					  int *max_error,
-					  struct timeval *vblank_time,
-					  unsigned flags,
-					  const struct drm_display_mode *mode)
+bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
+					   unsigned int pipe,
+					   int *max_error,
+					   struct timeval *vblank_time,
+					   unsigned flags,
+					   const struct drm_display_mode *mode)
 {
 	struct timeval tv_etime;
 	ktime_t stime, etime;
 	unsigned int vbl_status;
-	int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
 	int vpos, hpos, i;
 	int delta_ns, duration_ns;
 
 	if (pipe >= dev->num_crtcs) {
 		DRM_ERROR("Invalid crtc %u\n", pipe);
-		return -EINVAL;
+		return false;
 	}
 
 	/* Scanout position query not supported? Should not happen. */
 	if (!dev->driver->get_scanout_position) {
 		DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
-		return -EIO;
+		return false;
 	}
 
 	/* If mode timing undefined, just return as no-op:
@@ -768,7 +757,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 	 */
 	if (mode->crtc_clock == 0) {
 		DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
-		return -EAGAIN;
+		return false;
 	}
 
 	/* Get current scanout position with system timestamp.
@@ -792,7 +781,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 		if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
 			DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n",
 				  pipe, vbl_status);
-			return -EIO;
+			return false;
 		}
 
 		/* Compute uncertainty in timestamp of scanout position query. */
@@ -836,7 +825,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 		      (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
 		      duration_ns/1000, i);
 
-	return ret;
+	return true;
 }
 EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
 
@@ -872,25 +861,23 @@ static bool
 drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
 			  struct timeval *tvblank, unsigned flags)
 {
-	int ret;
+	bool ret = false;
 
 	/* Define requested maximum error on timestamps (nanoseconds). */
 	int max_error = (int) drm_timestamp_precision * 1000;
 
 	/* Query driver if possible and precision timestamping enabled. */
-	if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
+	if (dev->driver->get_vblank_timestamp && (max_error > 0))
 		ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
 							tvblank, flags);
-		if (ret > 0)
-			return true;
-	}
 
 	/* GPU high precision timestamp query unsupported or failed.
 	 * Return current monotonic/gettimeofday timestamp as best estimate.
 	 */
-	*tvblank = get_drm_timestamp();
+	if (!ret)
+		*tvblank = get_drm_timestamp();
 
-	return false;
+	return ret;
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 30daa809bd72..7595b9a7b5f3 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -964,7 +964,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
 	return position;
 }
 
-static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
+static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 			      int *max_error,
 			      struct timeval *vblank_time,
 			      unsigned flags)
@@ -974,19 +974,19 @@ static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 
 	if (pipe >= INTEL_INFO(dev_priv)->num_pipes) {
 		DRM_ERROR("Invalid crtc %u\n", pipe);
-		return -EINVAL;
+		return false;
 	}
 
 	/* Get drm_crtc to timestamp: */
 	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
 	if (crtc == NULL) {
 		DRM_ERROR("Invalid crtc %u\n", pipe);
-		return -EINVAL;
+		return false;
 	}
 
 	if (!crtc->base.hwmode.crtc_clock) {
 		DRM_DEBUG_KMS("crtc %u is disabled\n", pipe);
-		return -EBUSY;
+		return false;
 	}
 
 	/* Helper routine in DRM core does all the work: */
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index 41ccd2a15d3c..655700eb42ba 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -595,23 +595,23 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	return ret;
 }
 
-static int mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
-				     int *max_error,
-				     struct timeval *vblank_time,
-				     unsigned flags)
+static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
+				      int *max_error,
+				      struct timeval *vblank_time,
+				      unsigned flags)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct drm_crtc *crtc;
 
 	if (pipe < 0 || pipe >= priv->num_crtcs) {
 		DRM_ERROR("Invalid crtc %d\n", pipe);
-		return -EINVAL;
+		return false;
 	}
 
 	crtc = priv->crtcs[pipe];
 	if (!crtc) {
 		DRM_ERROR("Invalid crtc %d\n", pipe);
-		return -EINVAL;
+		return false;
 	}
 
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 6104f61b00fc..9375f41da523 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -156,7 +156,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	return 0;
 }
 
-int
+bool
 nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
 			 int *max_error, struct timeval *time, unsigned flags)
 {
@@ -174,7 +174,7 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
 		}
 	}
 
-	return -EINVAL;
+	return false;
 }
 
 static void
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index e1d772d39488..c6bfe533a641 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -71,8 +71,8 @@ void nouveau_display_vblank_disable(struct drm_device *, unsigned int);
 int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
 				unsigned int, int *, int *, ktime_t *,
 				ktime_t *, const struct drm_display_mode *);
-int  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
-			      struct timeval *, unsigned);
+bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
+			       struct timeval *, unsigned);
 
 int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 			    struct drm_pending_vblank_event *event,
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 93d45aa5c3d4..caa0b1cc4269 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -115,10 +115,10 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon);
 u32 radeon_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
 int radeon_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
-int radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
-				    int *max_error,
-				    struct timeval *vblank_time,
-				    unsigned flags);
+bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
+				     int *max_error,
+				     struct timeval *vblank_time,
+				     unsigned flags);
 void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
 int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
 void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index e3e7cb1d10a2..535969d74f64 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -869,25 +869,25 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
  *
  * Gets the timestamp on the requested crtc based on the
  * scanout position.  (all asics).
- * Returns postive status flags on success, negative error on failure.
+ * Returns true on success, false on failure.
  */
-int radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
-				    int *max_error,
-				    struct timeval *vblank_time,
-				    unsigned flags)
+bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
+				     int *max_error,
+				     struct timeval *vblank_time,
+				     unsigned flags)
 {
 	struct drm_crtc *drmcrtc;
 	struct radeon_device *rdev = dev->dev_private;
 
 	if (crtc < 0 || crtc >= dev->num_crtcs) {
 		DRM_ERROR("Invalid crtc %d\n", crtc);
-		return -EINVAL;
+		return false;
 	}
 
 	/* Get associated drm_crtc: */
 	drmcrtc = &rdev->mode_info.crtcs[crtc]->base;
 	if (!drmcrtc)
-		return -EINVAL;
+		return false;
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index e8f28c9145a0..60fefe9d7b8c 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -270,7 +270,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 	return ret;
 }
 
-int vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
+bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
 				  int *max_error, struct timeval *vblank_time,
 				  unsigned flags)
 {
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index dffce6293d87..8a5d0e12ee02 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -450,7 +450,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 			    unsigned int flags, int *vpos, int *hpos,
 			    ktime_t *stime, ktime_t *etime,
 			    const struct drm_display_mode *mode);
-int vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
+bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
 				  int *max_error, struct timeval *vblank_time,
 				  unsigned flags);
 
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index a5ddc2815bf4..1b3f3cd7b230 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -323,7 +323,6 @@ struct pci_controller;
 
 /* Flags and return codes for get_vblank_timestamp() driver function. */
 #define DRM_CALLED_FROM_VBLIRQ 1
-#define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
 
 /* get_scanout_position() return flags */
 #define DRM_SCANOUTPOS_VALID        (1 << 0)
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index d0b5f363bfa1..da78e248d9d8 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -316,11 +316,10 @@ struct drm_driver {
 	 *
 	 * Returns:
 	 *
-	 * Zero if timestamping isn't supported in current display mode or a
-	 * negative number on failure. A positive status code on success,
-	 * which describes how the vblank_time timestamp was computed.
+	 * True on success, false on failure, which means the core should
+	 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
 	 */
-	int (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
+	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
 				     unsigned flags);
diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
index cf0be6594c8c..f0d5ccf9b282 100644
--- a/include/drm/drm_irq.h
+++ b/include/drm/drm_irq.h
@@ -153,11 +153,11 @@ void drm_crtc_vblank_on(struct drm_crtc *crtc);
 void drm_vblank_cleanup(struct drm_device *dev);
 u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
 
-int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
-					  unsigned int pipe, int *max_error,
-					  struct timeval *vblank_time,
-					  unsigned flags,
-					  const struct drm_display_mode *mode);
+bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
+					   unsigned int pipe, int *max_error,
+					   struct timeval *vblank_time,
+					   unsigned flags,
+					   const struct drm_display_mode *mode);
 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 				     const struct drm_display_mode *mode);
 
-- 
2.11.0

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Re: [PATCH 05/11] drm/vblank: Switch drm_driver->get_vblank_timestamp to return a bool

[Neil Armstrong]

On 04/04/2017 11:52 AM, Daniel Vetter wrote:
> There's really no reason for anything more:
> - Calling this while the crtc vblank stuff isn't set up is a driver
>   bug. Those places arlready DRM_ERROR.
s/arlready/already/
> - Calling this when the crtc is off is either a driver bug (callin
s/callin/calling/
>   drm_crtc_handle_vblank at the wrong time) or a core bug (for
>   anything else). Again, we DRM_ERROR.
> - EINVAL is checked at higher levels already, and if we'd use struct
>   drm_crtc * instead of (dev, pipe) it would be real obvious that
>   those are again core bugs.
> 
> The only valid failure mode is crap hardware that couldn't sample a
> useful timestamp, to ask the core to just grab a not-so-accurate
> timestampe. Bool is perfectly fine for that.
s/timestampe/timestamp/
> 
> v2: Also fix up the one caller, I lost that in the shuffling (Jani).
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Ben Skeggs <bskeggs@redhat.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  8 ++---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   | 14 ++++-----
>  drivers/gpu/drm/drm_irq.c                 | 49 ++++++++++++-------------------
>  drivers/gpu/drm/i915/i915_irq.c           |  8 ++---
>  drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   | 12 ++++----
>  drivers/gpu/drm/nouveau/nouveau_display.c |  4 +--
>  drivers/gpu/drm/nouveau/nouveau_display.h |  4 +--
>  drivers/gpu/drm/radeon/radeon_drv.c       |  8 ++---
>  drivers/gpu/drm/radeon/radeon_kms.c       | 14 ++++-----
>  drivers/gpu/drm/vc4/vc4_crtc.c            |  2 +-
>  drivers/gpu/drm/vc4/vc4_drv.h             |  2 +-
>  include/drm/drmP.h                        |  1 -
>  include/drm/drm_drv.h                     |  7 ++---
>  include/drm/drm_irq.h                     | 10 +++----
>  14 files changed, 64 insertions(+), 79 deletions(-)
> 
[...]

With the commit log typo fixes,
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
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[PATCH 07/11] drm/vblank: Add FIXME comments about moving the vblank ts hooks

[Daniel Vetter]

This is going to be a bit too much, but good to have at least a small
note about where this should all head towards.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 include/drm/drm_drv.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 9fe6301edd6a..0a367cf5d8d5 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -274,6 +274,11 @@ struct drm_driver {
 	 *     constant but unknown small number of scanlines wrt. real scanout
 	 *     position.
 	 *
+	 * FIXME:
+	 *
+	 * Since this is a helper to implement @get_vblank_timestamp, we should
+	 * move it to &struct drm_crtc_helper_funcs, like all the other
+	 * helper-internal hooks.
 	 */
 	int (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
 				     unsigned int flags, int *vpos, int *hpos,
@@ -317,6 +322,11 @@ struct drm_driver {
 	 *
 	 * True on success, false on failure, which means the core should
 	 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
+	 *
+	 * FIXME:
+	 *
+	 * We should move this hook to &struct drm_crtc_funcs like all the other
+	 * vblank hooks.
 	 */
 	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
-- 
2.11.0

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Re: [PATCH 07/11] drm/vblank: Add FIXME comments about moving the vblank ts hooks

[Neil Armstrong]

On 04/04/2017 11:53 AM, Daniel Vetter wrote:
> This is going to be a bit too much, but good to have at least a small
> note about where this should all head towards.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  include/drm/drm_drv.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index 9fe6301edd6a..0a367cf5d8d5 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -274,6 +274,11 @@ struct drm_driver {
>  	 *     constant but unknown small number of scanlines wrt. real scanout
>  	 *     position.
>  	 *
> +	 * FIXME:
> +	 *
> +	 * Since this is a helper to implement @get_vblank_timestamp, we should
> +	 * move it to &struct drm_crtc_helper_funcs, like all the other
> +	 * helper-internal hooks.
>  	 */
>  	int (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
>  				     unsigned int flags, int *vpos, int *hpos,
> @@ -317,6 +322,11 @@ struct drm_driver {
>  	 *
>  	 * True on success, false on failure, which means the core should
>  	 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
> +	 *
> +	 * FIXME:
> +	 *
> +	 * We should move this hook to &struct drm_crtc_funcs like all the other
> +	 * vblank hooks.
>  	 */
>  	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
>  				     int *max_error,
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
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[PATCH 06/11] drm/vblank: Switch to bool in_vblank_irq in get_vblank_timestamp

[Daniel Vetter]

It's overkill to have a flag parameter which is essentially used just
as a boolean. This takes care of core + adjusting drivers.

Adjusting the scanout position callback is a bit harder, since radeon
also supplies it's own driver-private flags in there.

Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   |  6 ++---
 drivers/gpu/drm/drm_irq.c                 | 41 +++++++++++++++++--------------
 drivers/gpu/drm/i915/i915_irq.c           |  4 +--
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   |  4 +--
 drivers/gpu/drm/nouveau/nouveau_display.c |  5 ++--
 drivers/gpu/drm/nouveau/nouveau_display.h |  2 +-
 drivers/gpu/drm/radeon/radeon_drv.c       |  2 +-
 drivers/gpu/drm/radeon/radeon_kms.c       |  4 +--
 drivers/gpu/drm/vc4/vc4_crtc.c            |  4 +--
 drivers/gpu/drm/vc4/vc4_drv.h             |  2 +-
 include/drm/drm_drv.h                     | 11 ++++-----
 include/drm/drm_irq.h                     |  2 +-
 13 files changed, 46 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 0dcc9ee73ab1..310b20ef794a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1916,7 +1916,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags);
+				     bool in_vblank_irq);
 long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
 			     unsigned long arg);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index ba937d763df5..109a77ffc692 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -947,7 +947,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
  * @crtc: crtc to get the timestamp for
  * @max_error: max error
  * @vblank_time: time value
- * @flags: flags passed to the driver
+ * @in_vblank_irq: called from drm_handle_vblank()
  *
  * Gets the timestamp on the requested crtc based on the
  * scanout position.  (all asics).
@@ -956,7 +956,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
 bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags)
+				     bool in_vblank_irq)
 {
 	struct drm_crtc *crtc;
 	struct amdgpu_device *adev = dev->dev_private;
@@ -977,7 +977,7 @@ bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &crtc->hwmode);
 }
 
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 319ab3661965..82b6e0521fe1 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -54,7 +54,7 @@
 
 static bool
 drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
-			  struct timeval *tvblank, unsigned flags);
+			  struct timeval *tvblank, bool in_vblank_irq);
 
 static unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
 
@@ -138,7 +138,7 @@ static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe
 	 */
 	do {
 		cur_vblank = __get_vblank_counter(dev, pipe);
-		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0);
+		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
 	} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
 
 	/*
@@ -171,7 +171,7 @@ static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe
  * device vblank fields.
  */
 static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
-				    unsigned long flags)
+				    bool in_vblank_irq)
 {
 	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 	u32 cur_vblank, diff;
@@ -194,7 +194,7 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 	 */
 	do {
 		cur_vblank = __get_vblank_counter(dev, pipe);
-		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags);
+		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq);
 	} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
 
 	if (dev->max_vblank_count != 0) {
@@ -214,13 +214,13 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 		 */
 		diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
 
-		if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ)
+		if (diff == 0 && in_vblank_irq)
 			DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
 				      " diff_ns = %lld, framedur_ns = %d)\n",
 				      pipe, (long long) diff_ns, framedur_ns);
 	} else {
 		/* some kind of default for drivers w/o accurate vbl timestamping */
-		diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
+		diff = in_vblank_irq ? 1 : 0;
 	}
 
 	/*
@@ -253,7 +253,7 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 	 * Otherwise reinitialize delayed at next vblank interrupt and assign 0
 	 * for now, to mark the vblanktimestamp as invalid.
 	 */
-	if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0)
+	if (!rc && in_vblank_irq)
 		t_vblank = (struct timeval) {0, 0};
 
 	store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
@@ -291,7 +291,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
 
 	spin_lock_irqsave(&dev->vblank_time_lock, flags);
 
-	drm_update_vblank_count(dev, pipe, 0);
+	drm_update_vblank_count(dev, pipe, false);
 	vblank = drm_vblank_count(dev, pipe);
 
 	spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
@@ -349,7 +349,7 @@ static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
 	 * this time. This makes the count account for the entire time
 	 * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
 	 */
-	drm_update_vblank_count(dev, pipe, 0);
+	drm_update_vblank_count(dev, pipe, false);
 
 	spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
 }
@@ -700,9 +700,10 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
  * @max_error: Desired maximum allowable error in timestamps (nanosecs)
  *             On return contains true maximum error of timestamp
  * @vblank_time: Pointer to struct timeval which should receive the timestamp
- * @flags: Flags to pass to driver:
- *         0 = Default,
- *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
+ * @in_vblank_irq:
+ *     True when called from drm_crtc_handle_vblank().  Some drivers
+ *     need to apply some workarounds for gpu-specific vblank irq quirks
+ *     if flag is set.
  * @mode: mode which defines the scanout timings
  *
  * Implements calculation of exact vblank timestamps from given drm_display_mode
@@ -732,7 +733,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 					   unsigned int pipe,
 					   int *max_error,
 					   struct timeval *vblank_time,
-					   unsigned flags,
+					   bool in_vblank_irq,
 					   const struct drm_display_mode *mode)
 {
 	struct timeval tv_etime;
@@ -740,6 +741,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 	unsigned int vbl_status;
 	int vpos, hpos, i;
 	int delta_ns, duration_ns;
+	unsigned flags = in_vblank_irq ? DRM_CALLED_FROM_VBLIRQ : 0;
 
 	if (pipe >= dev->num_crtcs) {
 		DRM_ERROR("Invalid crtc %u\n", pipe);
@@ -843,9 +845,10 @@ static struct timeval get_drm_timestamp(void)
  * @dev: DRM device
  * @pipe: index of CRTC whose vblank timestamp to retrieve
  * @tvblank: Pointer to target struct timeval which should receive the timestamp
- * @flags: Flags to pass to driver:
- *         0 = Default,
- *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
+ * @in_vblank_irq:
+ *     True when called from drm_crtc_handle_vblank().  Some drivers
+ *     need to apply some workarounds for gpu-specific vblank irq quirks
+ *     if flag is set.
  *
  * Fetches the system timestamp corresponding to the time of the most recent
  * vblank interval on specified CRTC. May call into kms-driver to
@@ -859,7 +862,7 @@ static struct timeval get_drm_timestamp(void)
  */
 static bool
 drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
-			  struct timeval *tvblank, unsigned flags)
+			  struct timeval *tvblank, bool in_vblank_irq)
 {
 	bool ret = false;
 
@@ -869,7 +872,7 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
 	/* Query driver if possible and precision timestamping enabled. */
 	if (dev->driver->get_vblank_timestamp && (max_error > 0))
 		ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
-							tvblank, flags);
+							tvblank, in_vblank_irq);
 
 	/* GPU high precision timestamp query unsupported or failed.
 	 * Return current monotonic/gettimeofday timestamp as best estimate.
@@ -1745,7 +1748,7 @@ bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe)
 		return false;
 	}
 
-	drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ);
+	drm_update_vblank_count(dev, pipe, true);
 
 	spin_unlock(&dev->vblank_time_lock);
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7595b9a7b5f3..6e1063d3629e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -967,7 +967,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
 static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 			      int *max_error,
 			      struct timeval *vblank_time,
-			      unsigned flags)
+			      bool in_vblank_irq)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_crtc *crtc;
@@ -991,7 +991,7 @@ static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &crtc->base.hwmode);
 }
 
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index 655700eb42ba..16184ccbdd3b 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -598,7 +598,7 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
 static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 				      int *max_error,
 				      struct timeval *vblank_time,
-				      unsigned flags)
+				      bool in_vblank_irq)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct drm_crtc *crtc;
@@ -615,7 +615,7 @@ static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 	}
 
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &crtc->mode);
 }
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 9375f41da523..c7caa0674c54 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -158,7 +158,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
 
 bool
 nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
-			 int *max_error, struct timeval *time, unsigned flags)
+			 int *max_error, struct timeval *time, bool in_vblank_irq)
 {
 	struct drm_crtc *crtc;
 
@@ -170,7 +170,8 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
 			else
 				mode = &crtc->hwmode;
 			return drm_calc_vbltimestamp_from_scanoutpos(dev,
-					pipe, max_error, time, flags, mode);
+					pipe, max_error, time, in_vblank_irq,
+					mode);
 		}
 	}
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index c6bfe533a641..8ec86259c5ac 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -72,7 +72,7 @@ int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
 				unsigned int, int *, int *, ktime_t *,
 				ktime_t *, const struct drm_display_mode *);
 bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
-			       struct timeval *, unsigned);
+			       struct timeval *, bool);
 
 int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 			    struct drm_pending_vblank_event *event,
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index caa0b1cc4269..88fc791ec8fb 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -118,7 +118,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags);
+				     bool in_vblank_irq);
 void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
 int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
 void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 535969d74f64..5bccdeae0773 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -874,7 +874,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
 bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags)
+				     bool in_vblank_irq)
 {
 	struct drm_crtc *drmcrtc;
 	struct radeon_device *rdev = dev->dev_private;
@@ -891,7 +891,7 @@ bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &drmcrtc->hwmode);
 }
 
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 60fefe9d7b8c..38f5cc740cd1 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -272,14 +272,14 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 
 bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
 				  int *max_error, struct timeval *vblank_time,
-				  unsigned flags)
+				  bool in_vblank_irq)
 {
 	struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
 	struct drm_crtc_state *state = crtc->state;
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc_id, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &state->adjusted_mode);
 }
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 8a5d0e12ee02..815cdeb54971 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -452,7 +452,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 			    const struct drm_display_mode *mode);
 bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
 				  int *max_error, struct timeval *vblank_time,
-				  unsigned flags);
+				  bool in_vblank_irq);
 
 /* vc4_debugfs.c */
 int vc4_debugfs_init(struct drm_minor *minor);
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index da78e248d9d8..9fe6301edd6a 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -308,11 +308,10 @@ struct drm_driver {
 	 *     Returns true upper bound on error for timestamp.
 	 * vblank_time:
 	 *     Target location for returned vblank timestamp.
-	 * flags:
-	 *     0 = Defaults, no special treatment needed.
-	 *     DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
-	 *     irq handler. Some drivers need to apply some workarounds
-	 *     for gpu-specific vblank irq quirks if flag is set.
+	 * in_vblank_irq:
+	 *     True when called from drm_crtc_handle_vblank().  Some drivers
+	 *     need to apply some workarounds for gpu-specific vblank irq quirks
+	 *     if flag is set.
 	 *
 	 * Returns:
 	 *
@@ -322,7 +321,7 @@ struct drm_driver {
 	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags);
+				     bool in_vblank_irq);
 
 	/* these have to be filled in */
 
diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
index f0d5ccf9b282..445406efb8dc 100644
--- a/include/drm/drm_irq.h
+++ b/include/drm/drm_irq.h
@@ -156,7 +156,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
 bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 					   unsigned int pipe, int *max_error,
 					   struct timeval *vblank_time,
-					   unsigned flags,
+					   bool in_vblank_irq,
 					   const struct drm_display_mode *mode);
 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 				     const struct drm_display_mode *mode);
-- 
2.11.0

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Freedreno@lists.freedesktop.org
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Re: [PATCH 06/11] drm/vblank: Switch to bool in_vblank_irq in get_vblank_timestamp

[Neil Armstrong]

On 04/04/2017 11:52 AM, Daniel Vetter wrote:
> It's overkill to have a flag parameter which is essentially used just
> as a boolean. This takes care of core + adjusting drivers.
> 
> Adjusting the scanout position callback is a bit harder, since radeon
> also supplies it's own driver-private flags in there.
> 
> Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Ben Skeggs <bskeggs@redhat.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  2 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   |  6 ++---
>  drivers/gpu/drm/drm_irq.c                 | 41 +++++++++++++++++--------------
>  drivers/gpu/drm/i915/i915_irq.c           |  4 +--
>  drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   |  4 +--
>  drivers/gpu/drm/nouveau/nouveau_display.c |  5 ++--
>  drivers/gpu/drm/nouveau/nouveau_display.h |  2 +-
>  drivers/gpu/drm/radeon/radeon_drv.c       |  2 +-
>  drivers/gpu/drm/radeon/radeon_kms.c       |  4 +--
>  drivers/gpu/drm/vc4/vc4_crtc.c            |  4 +--
>  drivers/gpu/drm/vc4/vc4_drv.h             |  2 +-
>  include/drm/drm_drv.h                     | 11 ++++-----
>  include/drm/drm_irq.h                     |  2 +-
>  13 files changed, 46 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 0dcc9ee73ab1..310b20ef794a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1916,7 +1916,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
>  bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
>  				     int *max_error,
>  				     struct timeval *vblank_time,
> -				     unsigned flags);
> +				     bool in_vblank_irq);
>  long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
>  			     unsigned long arg);
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index ba937d763df5..109a77ffc692 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -947,7 +947,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
>   * @crtc: crtc to get the timestamp for
>   * @max_error: max error
>   * @vblank_time: time value
> - * @flags: flags passed to the driver
> + * @in_vblank_irq: called from drm_handle_vblank()
>   *
>   * Gets the timestamp on the requested crtc based on the
>   * scanout position.  (all asics).
> @@ -956,7 +956,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
>  bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
>  				     int *max_error,
>  				     struct timeval *vblank_time,
> -				     unsigned flags)
> +				     bool in_vblank_irq)
>  {
>  	struct drm_crtc *crtc;
>  	struct amdgpu_device *adev = dev->dev_private;
> @@ -977,7 +977,7 @@ bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
>  
>  	/* Helper routine in DRM core does all the work: */
>  	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> -						     vblank_time, flags,
> +						     vblank_time, in_vblank_irq,
>  						     &crtc->hwmode);
>  }
>  
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 319ab3661965..82b6e0521fe1 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -54,7 +54,7 @@
>  
>  static bool
>  drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
> -			  struct timeval *tvblank, unsigned flags);
> +			  struct timeval *tvblank, bool in_vblank_irq);
>  
>  static unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
>  
> @@ -138,7 +138,7 @@ static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe
>  	 */
>  	do {
>  		cur_vblank = __get_vblank_counter(dev, pipe);
> -		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0);
> +		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
>  	} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
>  
>  	/*
> @@ -171,7 +171,7 @@ static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe
>   * device vblank fields.
>   */
>  static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
> -				    unsigned long flags)
> +				    bool in_vblank_irq)
>  {
>  	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
>  	u32 cur_vblank, diff;
> @@ -194,7 +194,7 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
>  	 */
>  	do {
>  		cur_vblank = __get_vblank_counter(dev, pipe);
> -		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags);
> +		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq);
>  	} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
>  
>  	if (dev->max_vblank_count != 0) {
> @@ -214,13 +214,13 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
>  		 */
>  		diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
>  
> -		if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ)
> +		if (diff == 0 && in_vblank_irq)
>  			DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
>  				      " diff_ns = %lld, framedur_ns = %d)\n",
>  				      pipe, (long long) diff_ns, framedur_ns);
>  	} else {
>  		/* some kind of default for drivers w/o accurate vbl timestamping */
> -		diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
> +		diff = in_vblank_irq ? 1 : 0;
>  	}
>  
>  	/*
> @@ -253,7 +253,7 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
>  	 * Otherwise reinitialize delayed at next vblank interrupt and assign 0
>  	 * for now, to mark the vblanktimestamp as invalid.
>  	 */
> -	if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0)
> +	if (!rc && in_vblank_irq)
>  		t_vblank = (struct timeval) {0, 0};
>  
>  	store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
> @@ -291,7 +291,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
>  
>  	spin_lock_irqsave(&dev->vblank_time_lock, flags);
>  
> -	drm_update_vblank_count(dev, pipe, 0);
> +	drm_update_vblank_count(dev, pipe, false);
>  	vblank = drm_vblank_count(dev, pipe);
>  
>  	spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
> @@ -349,7 +349,7 @@ static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
>  	 * this time. This makes the count account for the entire time
>  	 * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
>  	 */
> -	drm_update_vblank_count(dev, pipe, 0);
> +	drm_update_vblank_count(dev, pipe, false);
>  
>  	spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
>  }
> @@ -700,9 +700,10 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
>   * @max_error: Desired maximum allowable error in timestamps (nanosecs)
>   *             On return contains true maximum error of timestamp
>   * @vblank_time: Pointer to struct timeval which should receive the timestamp
> - * @flags: Flags to pass to driver:
> - *         0 = Default,
> - *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
> + * @in_vblank_irq:
> + *     True when called from drm_crtc_handle_vblank().  Some drivers
> + *     need to apply some workarounds for gpu-specific vblank irq quirks
> + *     if flag is set.
>   * @mode: mode which defines the scanout timings
>   *
>   * Implements calculation of exact vblank timestamps from given drm_display_mode
> @@ -732,7 +733,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  					   unsigned int pipe,
>  					   int *max_error,
>  					   struct timeval *vblank_time,
> -					   unsigned flags,
> +					   bool in_vblank_irq,
>  					   const struct drm_display_mode *mode)
>  {
>  	struct timeval tv_etime;
> @@ -740,6 +741,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  	unsigned int vbl_status;
>  	int vpos, hpos, i;
>  	int delta_ns, duration_ns;
> +	unsigned flags = in_vblank_irq ? DRM_CALLED_FROM_VBLIRQ : 0;
>  
>  	if (pipe >= dev->num_crtcs) {
>  		DRM_ERROR("Invalid crtc %u\n", pipe);
> @@ -843,9 +845,10 @@ static struct timeval get_drm_timestamp(void)
>   * @dev: DRM device
>   * @pipe: index of CRTC whose vblank timestamp to retrieve
>   * @tvblank: Pointer to target struct timeval which should receive the timestamp
> - * @flags: Flags to pass to driver:
> - *         0 = Default,
> - *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
> + * @in_vblank_irq:
> + *     True when called from drm_crtc_handle_vblank().  Some drivers
> + *     need to apply some workarounds for gpu-specific vblank irq quirks
> + *     if flag is set.
>   *
>   * Fetches the system timestamp corresponding to the time of the most recent
>   * vblank interval on specified CRTC. May call into kms-driver to
> @@ -859,7 +862,7 @@ static struct timeval get_drm_timestamp(void)
>   */
>  static bool
>  drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
> -			  struct timeval *tvblank, unsigned flags)
> +			  struct timeval *tvblank, bool in_vblank_irq)
>  {
>  	bool ret = false;
>  
> @@ -869,7 +872,7 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
>  	/* Query driver if possible and precision timestamping enabled. */
>  	if (dev->driver->get_vblank_timestamp && (max_error > 0))
>  		ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
> -							tvblank, flags);
> +							tvblank, in_vblank_irq);
>  
>  	/* GPU high precision timestamp query unsupported or failed.
>  	 * Return current monotonic/gettimeofday timestamp as best estimate.
> @@ -1745,7 +1748,7 @@ bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe)
>  		return false;
>  	}
>  
> -	drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ);
> +	drm_update_vblank_count(dev, pipe, true);
>  
>  	spin_unlock(&dev->vblank_time_lock);
>  
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 7595b9a7b5f3..6e1063d3629e 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -967,7 +967,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
>  static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
>  			      int *max_error,
>  			      struct timeval *vblank_time,
> -			      unsigned flags)
> +			      bool in_vblank_irq)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(dev);
>  	struct intel_crtc *crtc;
> @@ -991,7 +991,7 @@ static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
>  
>  	/* Helper routine in DRM core does all the work: */
>  	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> -						     vblank_time, flags,
> +						     vblank_time, in_vblank_irq,
>  						     &crtc->base.hwmode);
>  }
>  
> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> index 655700eb42ba..16184ccbdd3b 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> @@ -598,7 +598,7 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
>  static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
>  				      int *max_error,
>  				      struct timeval *vblank_time,
> -				      unsigned flags)
> +				      bool in_vblank_irq)
>  {
>  	struct msm_drm_private *priv = dev->dev_private;
>  	struct drm_crtc *crtc;
> @@ -615,7 +615,7 @@ static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
>  	}
>  
>  	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> -						     vblank_time, flags,
> +						     vblank_time, in_vblank_irq,
>  						     &crtc->mode);
>  }
>  
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index 9375f41da523..c7caa0674c54 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -158,7 +158,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
>  
>  bool
>  nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
> -			 int *max_error, struct timeval *time, unsigned flags)
> +			 int *max_error, struct timeval *time, bool in_vblank_irq)
>  {
>  	struct drm_crtc *crtc;
>  
> @@ -170,7 +170,8 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
>  			else
>  				mode = &crtc->hwmode;
>  			return drm_calc_vbltimestamp_from_scanoutpos(dev,
> -					pipe, max_error, time, flags, mode);
> +					pipe, max_error, time, in_vblank_irq,
> +					mode);
>  		}
>  	}
>  
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
> index c6bfe533a641..8ec86259c5ac 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.h
> @@ -72,7 +72,7 @@ int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
>  				unsigned int, int *, int *, ktime_t *,
>  				ktime_t *, const struct drm_display_mode *);
>  bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
> -			       struct timeval *, unsigned);
> +			       struct timeval *, bool);
>  
>  int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  			    struct drm_pending_vblank_event *event,
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index caa0b1cc4269..88fc791ec8fb 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -118,7 +118,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
>  bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
>  				     int *max_error,
>  				     struct timeval *vblank_time,
> -				     unsigned flags);
> +				     bool in_vblank_irq);
>  void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
>  int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
>  void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> index 535969d74f64..5bccdeae0773 100644
> --- a/drivers/gpu/drm/radeon/radeon_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> @@ -874,7 +874,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
>  bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
>  				     int *max_error,
>  				     struct timeval *vblank_time,
> -				     unsigned flags)
> +				     bool in_vblank_irq)
>  {
>  	struct drm_crtc *drmcrtc;
>  	struct radeon_device *rdev = dev->dev_private;
> @@ -891,7 +891,7 @@ bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
>  
>  	/* Helper routine in DRM core does all the work: */
>  	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
> -						     vblank_time, flags,
> +						     vblank_time, in_vblank_irq,
>  						     &drmcrtc->hwmode);
>  }
>  
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 60fefe9d7b8c..38f5cc740cd1 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -272,14 +272,14 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  
>  bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
>  				  int *max_error, struct timeval *vblank_time,
> -				  unsigned flags)
> +				  bool in_vblank_irq)
>  {
>  	struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
>  	struct drm_crtc_state *state = crtc->state;
>  
>  	/* Helper routine in DRM core does all the work: */
>  	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc_id, max_error,
> -						     vblank_time, flags,
> +						     vblank_time, in_vblank_irq,
>  						     &state->adjusted_mode);
>  }
>  
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 8a5d0e12ee02..815cdeb54971 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -452,7 +452,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  			    const struct drm_display_mode *mode);
>  bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
>  				  int *max_error, struct timeval *vblank_time,
> -				  unsigned flags);
> +				  bool in_vblank_irq);
>  
>  /* vc4_debugfs.c */
>  int vc4_debugfs_init(struct drm_minor *minor);
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index da78e248d9d8..9fe6301edd6a 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -308,11 +308,10 @@ struct drm_driver {
>  	 *     Returns true upper bound on error for timestamp.
>  	 * vblank_time:
>  	 *     Target location for returned vblank timestamp.
> -	 * flags:
> -	 *     0 = Defaults, no special treatment needed.
> -	 *     DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
> -	 *     irq handler. Some drivers need to apply some workarounds
> -	 *     for gpu-specific vblank irq quirks if flag is set.
> +	 * in_vblank_irq:
> +	 *     True when called from drm_crtc_handle_vblank().  Some drivers
> +	 *     need to apply some workarounds for gpu-specific vblank irq quirks
> +	 *     if flag is set.
>  	 *
>  	 * Returns:
>  	 *
> @@ -322,7 +321,7 @@ struct drm_driver {
>  	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
>  				     int *max_error,
>  				     struct timeval *vblank_time,
> -				     unsigned flags);
> +				     bool in_vblank_irq);
>  
>  	/* these have to be filled in */
>  
> diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
> index f0d5ccf9b282..445406efb8dc 100644
> --- a/include/drm/drm_irq.h
> +++ b/include/drm/drm_irq.h
> @@ -156,7 +156,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
>  bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  					   unsigned int pipe, int *max_error,
>  					   struct timeval *vblank_time,
> -					   unsigned flags,
> +					   bool in_vblank_irq,
>  					   const struct drm_display_mode *mode);
>  void drm_calc_timestamping_constants(struct drm_crtc *crtc,
>  				     const struct drm_display_mode *mode);
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 08/11] drm/vblank: drop the mode argument from drm_calc_vbltimestamp_from_scanoutpos

[Daniel Vetter]

If we restrict this helper to only kms drivers (which is the case) we
can look up the correct mode easily ourselves. But it's a bit tricky:

- All legacy drivers look at crtc->hwmode. But that is update already
  at the beginning of the modeset helper, which means when we disable
  a pipe. Hence the final timestamps might be a bit off. But since
  this is an existing bug I'm not going to change it, but just try to
  be bug-for-bug compatible with the current code. This only applies
  to radeon&amdgpu.

- i915 tries to get it perfect by updating crtc->hwmode when the pipe
  is off (i.e. vblank->enabled = false).

- All other atomic drivers look at crtc->state->adjusted_mode. Those
  that look at state->requested_mode simply don't adjust their mode,
  so it's the same. That has two problems: Accessing crtc->state from
  interrupt handling code is unsafe, and it's updated before we shut
  down the pipe. For nonblocking modesets it's even worse.

For atomic drivers try to implement what i915 does. To do that we add
a new hwmode field to the vblank structure, and update it from
drm_calc_timestamping_constants(). For atomic drivers that's called
from the right spot by the helper library already, so all fine. But
for safety let's enforce that.

For legacy driver this function is only called at the end (oh the
fun), which is broken, so again let's not bother and just stay
bug-for-bug compatible.

The  benefit is that we can use drm_calc_vbltimestamp_from_scanoutpos
directly to implement ->get_vblank_timestamp in every driver, deleting
a lot of code.

v2: Completely new approach, trying to mimick the i915 solution.

v3: Fixup kerneldoc.

v4: Drop the WARN_ON to check that the vblank is off, atomic helpers
currently unconditionally call this. Recomputing the same stuff should
be harmless.

Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  4 ---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c   |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   | 41 -------------------------------
 drivers/gpu/drm/drm_irq.c                 | 27 +++++++++++++++++---
 drivers/gpu/drm/i915/i915_irq.c           | 33 +------------------------
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   | 26 +-------------------
 drivers/gpu/drm/nouveau/nouveau_display.c | 22 -----------------
 drivers/gpu/drm/nouveau/nouveau_display.h |  2 --
 drivers/gpu/drm/nouveau/nouveau_drm.c     |  2 +-
 drivers/gpu/drm/radeon/radeon_drv.c       |  6 +----
 drivers/gpu/drm/radeon/radeon_kms.c       | 37 ----------------------------
 drivers/gpu/drm/vc4/vc4_crtc.c            | 13 ----------
 drivers/gpu/drm/vc4/vc4_drv.c             |  2 +-
 drivers/gpu/drm/vc4/vc4_drv.h             |  3 ---
 include/drm/drm_irq.h                     | 15 +++++++++--
 15 files changed, 42 insertions(+), 193 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 310b20ef794a..11ebe861ec78 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1913,10 +1913,6 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon);
 u32 amdgpu_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
 int amdgpu_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
-bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
-				     int *max_error,
-				     struct timeval *vblank_time,
-				     bool in_vblank_irq);
 long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
 			     unsigned long arg);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 400917fd7486..40dd5d19f835 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -725,7 +725,7 @@ static struct drm_driver kms_driver = {
 	.get_vblank_counter = amdgpu_get_vblank_counter_kms,
 	.enable_vblank = amdgpu_enable_vblank_kms,
 	.disable_vblank = amdgpu_disable_vblank_kms,
-	.get_vblank_timestamp = amdgpu_get_vblank_timestamp_kms,
+	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
 	.get_scanout_position = amdgpu_get_crtc_scanoutpos,
 #if defined(CONFIG_DEBUG_FS)
 	.debugfs_init = amdgpu_debugfs_init,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 109a77ffc692..991ae253171b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -940,47 +940,6 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
 	amdgpu_irq_put(adev, &adev->crtc_irq, idx);
 }
 
-/**
- * amdgpu_get_vblank_timestamp_kms - get vblank timestamp
- *
- * @dev: drm dev pointer
- * @crtc: crtc to get the timestamp for
- * @max_error: max error
- * @vblank_time: time value
- * @in_vblank_irq: called from drm_handle_vblank()
- *
- * Gets the timestamp on the requested crtc based on the
- * scanout position.  (all asics).
- * Returns true on success, false on failure.
- */
-bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
-				     int *max_error,
-				     struct timeval *vblank_time,
-				     bool in_vblank_irq)
-{
-	struct drm_crtc *crtc;
-	struct amdgpu_device *adev = dev->dev_private;
-
-	if (pipe >= dev->num_crtcs) {
-		DRM_ERROR("Invalid crtc %u\n", pipe);
-		return false;
-	}
-
-	/* Get associated drm_crtc: */
-	crtc = &adev->mode_info.crtcs[pipe]->base;
-	if (!crtc) {
-		/* This can occur on driver load if some component fails to
-		 * initialize completely and driver is unloaded */
-		DRM_ERROR("Uninitialized crtc %d\n", pipe);
-		return false;
-	}
-
-	/* Helper routine in DRM core does all the work: */
-	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, in_vblank_irq,
-						     &crtc->hwmode);
-}
-
 const struct drm_ioctl_desc amdgpu_ioctls_kms[] = {
 	DRM_IOCTL_DEF_DRV(AMDGPU_GEM_CREATE, amdgpu_gem_create_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(AMDGPU_CTX, amdgpu_ctx_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 82b6e0521fe1..992eb3719c3e 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -684,6 +684,7 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 
 	vblank->linedur_ns  = linedur_ns;
 	vblank->framedur_ns = framedur_ns;
+	vblank->hwmode = *mode;
 
 	DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
 		  crtc->base.id, mode->crtc_htotal,
@@ -704,7 +705,6 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
  *     True when called from drm_crtc_handle_vblank().  Some drivers
  *     need to apply some workarounds for gpu-specific vblank irq quirks
  *     if flag is set.
- * @mode: mode which defines the scanout timings
  *
  * Implements calculation of exact vblank timestamps from given drm_display_mode
  * timings and current video scanout position of a CRTC. This can be called from
@@ -724,6 +724,13 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
  * returns as no operation if a doublescan or interlaced video mode is
  * active. Higher level code is expected to handle this.
  *
+ * This function can be used to implement the &drm_driver.get_vblank_timestamp
+ * directly, if the driver implements the &drm_driver.get_scanout_position hook.
+ *
+ * Note that atomic drivers must call drm_calc_timestamping_constants() before
+ * enabling a CRTC. The atomic helpers already take care of that in
+ * drm_atomic_helper_update_legacy_modeset_state().
+ *
  * Returns:
  *
  * Returns true on success, and false on failure, i.e. when no accurate
@@ -733,17 +740,24 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 					   unsigned int pipe,
 					   int *max_error,
 					   struct timeval *vblank_time,
-					   bool in_vblank_irq,
-					   const struct drm_display_mode *mode)
+					   bool in_vblank_irq)
 {
 	struct timeval tv_etime;
 	ktime_t stime, etime;
 	unsigned int vbl_status;
+	struct drm_crtc *crtc;
+	const struct drm_display_mode *mode;
+	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 	int vpos, hpos, i;
 	int delta_ns, duration_ns;
 	unsigned flags = in_vblank_irq ? DRM_CALLED_FROM_VBLIRQ : 0;
 
-	if (pipe >= dev->num_crtcs) {
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return false;
+
+	crtc = drm_crtc_from_index(dev, pipe);
+
+	if (pipe >= dev->num_crtcs || !crtc) {
 		DRM_ERROR("Invalid crtc %u\n", pipe);
 		return false;
 	}
@@ -754,6 +768,11 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 		return false;
 	}
 
+	if (drm_drv_uses_atomic_modeset(dev))
+		mode = &vblank->hwmode;
+	else
+		mode = &crtc->hwmode;
+
 	/* If mode timing undefined, just return as no-op:
 	 * Happens during initial modesetting of a crtc.
 	 */
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6e1063d3629e..fdb1162427a9 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -964,37 +964,6 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
 	return position;
 }
 
-static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
-			      int *max_error,
-			      struct timeval *vblank_time,
-			      bool in_vblank_irq)
-{
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_crtc *crtc;
-
-	if (pipe >= INTEL_INFO(dev_priv)->num_pipes) {
-		DRM_ERROR("Invalid crtc %u\n", pipe);
-		return false;
-	}
-
-	/* Get drm_crtc to timestamp: */
-	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
-	if (crtc == NULL) {
-		DRM_ERROR("Invalid crtc %u\n", pipe);
-		return false;
-	}
-
-	if (!crtc->base.hwmode.crtc_clock) {
-		DRM_DEBUG_KMS("crtc %u is disabled\n", pipe);
-		return false;
-	}
-
-	/* Helper routine in DRM core does all the work: */
-	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, in_vblank_irq,
-						     &crtc->base.hwmode);
-}
-
 static void ironlake_rps_change_irq_handler(struct drm_i915_private *dev_priv)
 {
 	u32 busy_up, busy_down, max_avg, min_avg;
@@ -4329,7 +4298,7 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 
 	dev_priv->hotplug.hpd_storm_threshold = HPD_STORM_DEFAULT_THRESHOLD;
 
-	dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
+	dev->driver->get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos;
 	dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
 
 	if (IS_CHERRYVIEW(dev_priv)) {
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index 16184ccbdd3b..6ba216b8bba9 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -595,30 +595,6 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	return ret;
 }
 
-static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
-				      int *max_error,
-				      struct timeval *vblank_time,
-				      bool in_vblank_irq)
-{
-	struct msm_drm_private *priv = dev->dev_private;
-	struct drm_crtc *crtc;
-
-	if (pipe < 0 || pipe >= priv->num_crtcs) {
-		DRM_ERROR("Invalid crtc %d\n", pipe);
-		return false;
-	}
-
-	crtc = priv->crtcs[pipe];
-	if (!crtc) {
-		DRM_ERROR("Invalid crtc %d\n", pipe);
-		return false;
-	}
-
-	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, in_vblank_irq,
-						     &crtc->mode);
-}
-
 static u32 mdp5_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
 {
 	struct msm_drm_private *priv = dev->dev_private;
@@ -728,7 +704,7 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
 	dev->mode_config.max_width = 0xffff;
 	dev->mode_config.max_height = 0xffff;
 
-	dev->driver->get_vblank_timestamp = mdp5_get_vblank_timestamp;
+	dev->driver->get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos;
 	dev->driver->get_scanout_position = mdp5_get_scanoutpos;
 	dev->driver->get_vblank_counter = mdp5_get_vblank_counter;
 	dev->max_vblank_count = 0xffffffff;
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index c7caa0674c54..33d0a6175d44 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -156,28 +156,6 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	return 0;
 }
 
-bool
-nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
-			 int *max_error, struct timeval *time, bool in_vblank_irq)
-{
-	struct drm_crtc *crtc;
-
-	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
-		if (nouveau_crtc(crtc)->index == pipe) {
-			struct drm_display_mode *mode;
-			if (drm_drv_uses_atomic_modeset(dev))
-				mode = &crtc->state->adjusted_mode;
-			else
-				mode = &crtc->hwmode;
-			return drm_calc_vbltimestamp_from_scanoutpos(dev,
-					pipe, max_error, time, in_vblank_irq,
-					mode);
-		}
-	}
-
-	return false;
-}
-
 static void
 nouveau_display_vblank_fini(struct drm_device *dev)
 {
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index 8ec86259c5ac..a8285c2747a9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -71,8 +71,6 @@ void nouveau_display_vblank_disable(struct drm_device *, unsigned int);
 int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
 				unsigned int, int *, int *, ktime_t *,
 				ktime_t *, const struct drm_display_mode *);
-bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
-			       struct timeval *, bool);
 
 int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 			    struct drm_pending_vblank_event *event,
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index ec719df619a6..1f751a3f570c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -978,7 +978,7 @@ driver_stub = {
 	.enable_vblank = nouveau_display_vblank_enable,
 	.disable_vblank = nouveau_display_vblank_disable,
 	.get_scanout_position = nouveau_display_scanoutpos,
-	.get_vblank_timestamp = nouveau_display_vblstamp,
+	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
 
 	.ioctls = nouveau_ioctls,
 	.num_ioctls = ARRAY_SIZE(nouveau_ioctls),
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 88fc791ec8fb..50d97f12e7bf 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -115,10 +115,6 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon);
 u32 radeon_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
 int radeon_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
-bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
-				     int *max_error,
-				     struct timeval *vblank_time,
-				     bool in_vblank_irq);
 void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
 int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
 void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
@@ -544,7 +540,7 @@ static struct drm_driver kms_driver = {
 	.get_vblank_counter = radeon_get_vblank_counter_kms,
 	.enable_vblank = radeon_enable_vblank_kms,
 	.disable_vblank = radeon_disable_vblank_kms,
-	.get_vblank_timestamp = radeon_get_vblank_timestamp_kms,
+	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
 	.get_scanout_position = radeon_get_crtc_scanoutpos,
 	.irq_preinstall = radeon_driver_irq_preinstall_kms,
 	.irq_postinstall = radeon_driver_irq_postinstall_kms,
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 5bccdeae0773..6a68d440bc44 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -858,43 +858,6 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 }
 
-/**
- * radeon_get_vblank_timestamp_kms - get vblank timestamp
- *
- * @dev: drm dev pointer
- * @crtc: crtc to get the timestamp for
- * @max_error: max error
- * @vblank_time: time value
- * @flags: flags passed to the driver
- *
- * Gets the timestamp on the requested crtc based on the
- * scanout position.  (all asics).
- * Returns true on success, false on failure.
- */
-bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
-				     int *max_error,
-				     struct timeval *vblank_time,
-				     bool in_vblank_irq)
-{
-	struct drm_crtc *drmcrtc;
-	struct radeon_device *rdev = dev->dev_private;
-
-	if (crtc < 0 || crtc >= dev->num_crtcs) {
-		DRM_ERROR("Invalid crtc %d\n", crtc);
-		return false;
-	}
-
-	/* Get associated drm_crtc: */
-	drmcrtc = &rdev->mode_info.crtcs[crtc]->base;
-	if (!drmcrtc)
-		return false;
-
-	/* Helper routine in DRM core does all the work: */
-	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
-						     vblank_time, in_vblank_irq,
-						     &drmcrtc->hwmode);
-}
-
 const struct drm_ioctl_desc radeon_ioctls_kms[] = {
 	DRM_IOCTL_DEF_DRV(RADEON_CP_INIT, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 	DRM_IOCTL_DEF_DRV(RADEON_CP_START, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 38f5cc740cd1..2acfecc5b811 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -270,19 +270,6 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 	return ret;
 }
 
-bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
-				  int *max_error, struct timeval *vblank_time,
-				  bool in_vblank_irq)
-{
-	struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
-	struct drm_crtc_state *state = crtc->state;
-
-	/* Helper routine in DRM core does all the work: */
-	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc_id, max_error,
-						     vblank_time, in_vblank_irq,
-						     &state->adjusted_mode);
-}
-
 static void vc4_crtc_destroy(struct drm_crtc *crtc)
 {
 	drm_crtc_cleanup(crtc);
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 61e674baf3a6..e864256e12e5 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -154,7 +154,7 @@ static struct drm_driver vc4_drm_driver = {
 	.irq_uninstall = vc4_irq_uninstall,
 
 	.get_scanout_position = vc4_crtc_get_scanoutpos,
-	.get_vblank_timestamp = vc4_crtc_get_vblank_timestamp,
+	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
 
 #if defined(CONFIG_DEBUG_FS)
 	.debugfs_init = vc4_debugfs_init,
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 815cdeb54971..64c92e0eb8f7 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -450,9 +450,6 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 			    unsigned int flags, int *vpos, int *hpos,
 			    ktime_t *stime, ktime_t *etime,
 			    const struct drm_display_mode *mode);
-bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
-				  int *max_error, struct timeval *vblank_time,
-				  bool in_vblank_irq);
 
 /* vc4_debugfs.c */
 int vc4_debugfs_init(struct drm_minor *minor);
diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
index 445406efb8dc..b489cc856e7a 100644
--- a/include/drm/drm_irq.h
+++ b/include/drm/drm_irq.h
@@ -121,6 +121,18 @@ struct drm_vblank_crtc {
 	 * drm_calc_timestamping_constants().
 	 */
 	int linedur_ns;
+
+	/**
+	 * @hwmode:
+	 *
+	 * Cache of the current hardware display mode. Only valide when @enabled
+	 * is set. This is used by helpers like
+	 * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
+	 * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
+	 * because that one is really hard to get at from interrupt context.
+	 */
+	struct drm_display_mode hwmode;
+
 	/**
 	 * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
 	 * avoid double-disabling and hence corrupting saved state. Needed by
@@ -156,8 +168,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
 bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 					   unsigned int pipe, int *max_error,
 					   struct timeval *vblank_time,
-					   bool in_vblank_irq,
-					   const struct drm_display_mode *mode);
+					   bool in_vblank_irq);
 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 				     const struct drm_display_mode *mode);
 
-- 
2.11.0

_______________________________________________
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Freedreno@lists.freedesktop.org
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Re: [PATCH 08/11] drm/vblank: drop the mode argument from drm_calc_vbltimestamp_from_scanoutpos

[Neil Armstrong]

On 04/04/2017 11:53 AM, Daniel Vetter wrote:
> If we restrict this helper to only kms drivers (which is the case) we
> can look up the correct mode easily ourselves. But it's a bit tricky:
> 
> - All legacy drivers look at crtc->hwmode. But that is update already
is updated ?
>   at the beginning of the modeset helper, which means when we disable
>   a pipe. Hence the final timestamps might be a bit off. But since
>   this is an existing bug I'm not going to change it, but just try to
>   be bug-for-bug compatible with the current code. This only applies
>   to radeon&amdgpu.
> 
> - i915 tries to get it perfect by updating crtc->hwmode when the pipe
>   is off (i.e. vblank->enabled = false).
> 
> - All other atomic drivers look at crtc->state->adjusted_mode. Those
>   that look at state->requested_mode simply don't adjust their mode,
>   so it's the same. That has two problems: Accessing crtc->state from
>   interrupt handling code is unsafe, and it's updated before we shut
>   down the pipe. For nonblocking modesets it's even worse.
> 
> For atomic drivers try to implement what i915 does. To do that we add
> a new hwmode field to the vblank structure, and update it from
> drm_calc_timestamping_constants(). For atomic drivers that's called
> from the right spot by the helper library already, so all fine. But
> for safety let's enforce that.
> 
> For legacy driver this function is only called at the end (oh the
> fun), which is broken, so again let's not bother and just stay
> bug-for-bug compatible.
> 
> The  benefit is that we can use drm_calc_vbltimestamp_from_scanoutpos
> directly to implement ->get_vblank_timestamp in every driver, deleting
> a lot of code.
> 
> v2: Completely new approach, trying to mimick the i915 solution.
> 
> v3: Fixup kerneldoc.
> 
> v4: Drop the WARN_ON to check that the vblank is off, atomic helpers
> currently unconditionally call this. Recomputing the same stuff should
> be harmless.
> 
> Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Ben Skeggs <bskeggs@redhat.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  4 ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c   |  2 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   | 41 -------------------------------
>  drivers/gpu/drm/drm_irq.c                 | 27 +++++++++++++++++---
>  drivers/gpu/drm/i915/i915_irq.c           | 33 +------------------------
>  drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   | 26 +-------------------
>  drivers/gpu/drm/nouveau/nouveau_display.c | 22 -----------------
>  drivers/gpu/drm/nouveau/nouveau_display.h |  2 --
>  drivers/gpu/drm/nouveau/nouveau_drm.c     |  2 +-
>  drivers/gpu/drm/radeon/radeon_drv.c       |  6 +----
>  drivers/gpu/drm/radeon/radeon_kms.c       | 37 ----------------------------
>  drivers/gpu/drm/vc4/vc4_crtc.c            | 13 ----------
>  drivers/gpu/drm/vc4/vc4_drv.c             |  2 +-
>  drivers/gpu/drm/vc4/vc4_drv.h             |  3 ---
>  include/drm/drm_irq.h                     | 15 +++++++++--
>  15 files changed, 42 insertions(+), 193 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 310b20ef794a..11ebe861ec78 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1913,10 +1913,6 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon);
>  u32 amdgpu_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
>  int amdgpu_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
>  void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> -bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> -				     int *max_error,
> -				     struct timeval *vblank_time,
> -				     bool in_vblank_irq);
>  long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
>  			     unsigned long arg);
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 400917fd7486..40dd5d19f835 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -725,7 +725,7 @@ static struct drm_driver kms_driver = {
>  	.get_vblank_counter = amdgpu_get_vblank_counter_kms,
>  	.enable_vblank = amdgpu_enable_vblank_kms,
>  	.disable_vblank = amdgpu_disable_vblank_kms,
> -	.get_vblank_timestamp = amdgpu_get_vblank_timestamp_kms,
> +	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
>  	.get_scanout_position = amdgpu_get_crtc_scanoutpos,
>  #if defined(CONFIG_DEBUG_FS)
>  	.debugfs_init = amdgpu_debugfs_init,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index 109a77ffc692..991ae253171b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -940,47 +940,6 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
>  	amdgpu_irq_put(adev, &adev->crtc_irq, idx);
>  }
>  
> -/**
> - * amdgpu_get_vblank_timestamp_kms - get vblank timestamp
> - *
> - * @dev: drm dev pointer
> - * @crtc: crtc to get the timestamp for
> - * @max_error: max error
> - * @vblank_time: time value
> - * @in_vblank_irq: called from drm_handle_vblank()
> - *
> - * Gets the timestamp on the requested crtc based on the
> - * scanout position.  (all asics).
> - * Returns true on success, false on failure.
> - */
> -bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> -				     int *max_error,
> -				     struct timeval *vblank_time,
> -				     bool in_vblank_irq)
> -{
> -	struct drm_crtc *crtc;
> -	struct amdgpu_device *adev = dev->dev_private;
> -
> -	if (pipe >= dev->num_crtcs) {
> -		DRM_ERROR("Invalid crtc %u\n", pipe);
> -		return false;
> -	}
> -
> -	/* Get associated drm_crtc: */
> -	crtc = &adev->mode_info.crtcs[pipe]->base;
> -	if (!crtc) {
> -		/* This can occur on driver load if some component fails to
> -		 * initialize completely and driver is unloaded */
> -		DRM_ERROR("Uninitialized crtc %d\n", pipe);
> -		return false;
> -	}
> -
> -	/* Helper routine in DRM core does all the work: */
> -	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> -						     vblank_time, in_vblank_irq,
> -						     &crtc->hwmode);
> -}
> -
>  const struct drm_ioctl_desc amdgpu_ioctls_kms[] = {
>  	DRM_IOCTL_DEF_DRV(AMDGPU_GEM_CREATE, amdgpu_gem_create_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
>  	DRM_IOCTL_DEF_DRV(AMDGPU_CTX, amdgpu_ctx_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 82b6e0521fe1..992eb3719c3e 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -684,6 +684,7 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
>  
>  	vblank->linedur_ns  = linedur_ns;
>  	vblank->framedur_ns = framedur_ns;
> +	vblank->hwmode = *mode;
>  
>  	DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
>  		  crtc->base.id, mode->crtc_htotal,
> @@ -704,7 +705,6 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
>   *     True when called from drm_crtc_handle_vblank().  Some drivers
>   *     need to apply some workarounds for gpu-specific vblank irq quirks
>   *     if flag is set.
> - * @mode: mode which defines the scanout timings
>   *
>   * Implements calculation of exact vblank timestamps from given drm_display_mode
>   * timings and current video scanout position of a CRTC. This can be called from
> @@ -724,6 +724,13 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
>   * returns as no operation if a doublescan or interlaced video mode is
>   * active. Higher level code is expected to handle this.
>   *
> + * This function can be used to implement the &drm_driver.get_vblank_timestamp
> + * directly, if the driver implements the &drm_driver.get_scanout_position hook.
> + *
> + * Note that atomic drivers must call drm_calc_timestamping_constants() before
> + * enabling a CRTC. The atomic helpers already take care of that in
> + * drm_atomic_helper_update_legacy_modeset_state().
> + *
>   * Returns:
>   *
>   * Returns true on success, and false on failure, i.e. when no accurate
> @@ -733,17 +740,24 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  					   unsigned int pipe,
>  					   int *max_error,
>  					   struct timeval *vblank_time,
> -					   bool in_vblank_irq,
> -					   const struct drm_display_mode *mode)
> +					   bool in_vblank_irq)
>  {
>  	struct timeval tv_etime;
>  	ktime_t stime, etime;
>  	unsigned int vbl_status;
> +	struct drm_crtc *crtc;
> +	const struct drm_display_mode *mode;
> +	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
>  	int vpos, hpos, i;
>  	int delta_ns, duration_ns;
>  	unsigned flags = in_vblank_irq ? DRM_CALLED_FROM_VBLIRQ : 0;
>  
> -	if (pipe >= dev->num_crtcs) {
> +	if (!drm_core_check_feature(dev, DRIVER_MODESET))
> +		return false;
> +
> +	crtc = drm_crtc_from_index(dev, pipe);
> +
> +	if (pipe >= dev->num_crtcs || !crtc) {
>  		DRM_ERROR("Invalid crtc %u\n", pipe);
>  		return false;
>  	}
> @@ -754,6 +768,11 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  		return false;
>  	}
>  
> +	if (drm_drv_uses_atomic_modeset(dev))
> +		mode = &vblank->hwmode;
> +	else
> +		mode = &crtc->hwmode;
> +
>  	/* If mode timing undefined, just return as no-op:
>  	 * Happens during initial modesetting of a crtc.
>  	 */
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 6e1063d3629e..fdb1162427a9 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -964,37 +964,6 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
>  	return position;
>  }
>  
> -static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> -			      int *max_error,
> -			      struct timeval *vblank_time,
> -			      bool in_vblank_irq)
> -{
> -	struct drm_i915_private *dev_priv = to_i915(dev);
> -	struct intel_crtc *crtc;
> -
> -	if (pipe >= INTEL_INFO(dev_priv)->num_pipes) {
> -		DRM_ERROR("Invalid crtc %u\n", pipe);
> -		return false;
> -	}
> -
> -	/* Get drm_crtc to timestamp: */
> -	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
> -	if (crtc == NULL) {
> -		DRM_ERROR("Invalid crtc %u\n", pipe);
> -		return false;
> -	}
> -
> -	if (!crtc->base.hwmode.crtc_clock) {
> -		DRM_DEBUG_KMS("crtc %u is disabled\n", pipe);
> -		return false;
> -	}
> -
> -	/* Helper routine in DRM core does all the work: */
> -	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> -						     vblank_time, in_vblank_irq,
> -						     &crtc->base.hwmode);
> -}
> -
>  static void ironlake_rps_change_irq_handler(struct drm_i915_private *dev_priv)
>  {
>  	u32 busy_up, busy_down, max_avg, min_avg;
> @@ -4329,7 +4298,7 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
>  
>  	dev_priv->hotplug.hpd_storm_threshold = HPD_STORM_DEFAULT_THRESHOLD;
>  
> -	dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
> +	dev->driver->get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos;
>  	dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
>  
>  	if (IS_CHERRYVIEW(dev_priv)) {
> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> index 16184ccbdd3b..6ba216b8bba9 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> @@ -595,30 +595,6 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
>  	return ret;
>  }
>  
> -static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> -				      int *max_error,
> -				      struct timeval *vblank_time,
> -				      bool in_vblank_irq)
> -{
> -	struct msm_drm_private *priv = dev->dev_private;
> -	struct drm_crtc *crtc;
> -
> -	if (pipe < 0 || pipe >= priv->num_crtcs) {
> -		DRM_ERROR("Invalid crtc %d\n", pipe);
> -		return false;
> -	}
> -
> -	crtc = priv->crtcs[pipe];
> -	if (!crtc) {
> -		DRM_ERROR("Invalid crtc %d\n", pipe);
> -		return false;
> -	}
> -
> -	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> -						     vblank_time, in_vblank_irq,
> -						     &crtc->mode);
> -}
> -
>  static u32 mdp5_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
>  {
>  	struct msm_drm_private *priv = dev->dev_private;
> @@ -728,7 +704,7 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
>  	dev->mode_config.max_width = 0xffff;
>  	dev->mode_config.max_height = 0xffff;
>  
> -	dev->driver->get_vblank_timestamp = mdp5_get_vblank_timestamp;
> +	dev->driver->get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos;
>  	dev->driver->get_scanout_position = mdp5_get_scanoutpos;
>  	dev->driver->get_vblank_counter = mdp5_get_vblank_counter;
>  	dev->max_vblank_count = 0xffffffff;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index c7caa0674c54..33d0a6175d44 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -156,28 +156,6 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
>  	return 0;
>  }
>  
> -bool
> -nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
> -			 int *max_error, struct timeval *time, bool in_vblank_irq)
> -{
> -	struct drm_crtc *crtc;
> -
> -	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
> -		if (nouveau_crtc(crtc)->index == pipe) {
> -			struct drm_display_mode *mode;
> -			if (drm_drv_uses_atomic_modeset(dev))
> -				mode = &crtc->state->adjusted_mode;
> -			else
> -				mode = &crtc->hwmode;
> -			return drm_calc_vbltimestamp_from_scanoutpos(dev,
> -					pipe, max_error, time, in_vblank_irq,
> -					mode);
> -		}
> -	}
> -
> -	return false;
> -}
> -
>  static void
>  nouveau_display_vblank_fini(struct drm_device *dev)
>  {
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
> index 8ec86259c5ac..a8285c2747a9 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.h
> @@ -71,8 +71,6 @@ void nouveau_display_vblank_disable(struct drm_device *, unsigned int);
>  int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
>  				unsigned int, int *, int *, ktime_t *,
>  				ktime_t *, const struct drm_display_mode *);
> -bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
> -			       struct timeval *, bool);
>  
>  int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  			    struct drm_pending_vblank_event *event,
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index ec719df619a6..1f751a3f570c 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -978,7 +978,7 @@ driver_stub = {
>  	.enable_vblank = nouveau_display_vblank_enable,
>  	.disable_vblank = nouveau_display_vblank_disable,
>  	.get_scanout_position = nouveau_display_scanoutpos,
> -	.get_vblank_timestamp = nouveau_display_vblstamp,
> +	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
>  
>  	.ioctls = nouveau_ioctls,
>  	.num_ioctls = ARRAY_SIZE(nouveau_ioctls),
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index 88fc791ec8fb..50d97f12e7bf 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -115,10 +115,6 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon);
>  u32 radeon_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
>  int radeon_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
>  void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> -bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> -				     int *max_error,
> -				     struct timeval *vblank_time,
> -				     bool in_vblank_irq);
>  void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
>  int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
>  void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
> @@ -544,7 +540,7 @@ static struct drm_driver kms_driver = {
>  	.get_vblank_counter = radeon_get_vblank_counter_kms,
>  	.enable_vblank = radeon_enable_vblank_kms,
>  	.disable_vblank = radeon_disable_vblank_kms,
> -	.get_vblank_timestamp = radeon_get_vblank_timestamp_kms,
> +	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
>  	.get_scanout_position = radeon_get_crtc_scanoutpos,
>  	.irq_preinstall = radeon_driver_irq_preinstall_kms,
>  	.irq_postinstall = radeon_driver_irq_postinstall_kms,
> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> index 5bccdeae0773..6a68d440bc44 100644
> --- a/drivers/gpu/drm/radeon/radeon_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> @@ -858,43 +858,6 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
>  	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
>  }
>  
> -/**
> - * radeon_get_vblank_timestamp_kms - get vblank timestamp
> - *
> - * @dev: drm dev pointer
> - * @crtc: crtc to get the timestamp for
> - * @max_error: max error
> - * @vblank_time: time value
> - * @flags: flags passed to the driver
> - *
> - * Gets the timestamp on the requested crtc based on the
> - * scanout position.  (all asics).
> - * Returns true on success, false on failure.
> - */
> -bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
> -				     int *max_error,
> -				     struct timeval *vblank_time,
> -				     bool in_vblank_irq)
> -{
> -	struct drm_crtc *drmcrtc;
> -	struct radeon_device *rdev = dev->dev_private;
> -
> -	if (crtc < 0 || crtc >= dev->num_crtcs) {
> -		DRM_ERROR("Invalid crtc %d\n", crtc);
> -		return false;
> -	}
> -
> -	/* Get associated drm_crtc: */
> -	drmcrtc = &rdev->mode_info.crtcs[crtc]->base;
> -	if (!drmcrtc)
> -		return false;
> -
> -	/* Helper routine in DRM core does all the work: */
> -	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
> -						     vblank_time, in_vblank_irq,
> -						     &drmcrtc->hwmode);
> -}
> -
>  const struct drm_ioctl_desc radeon_ioctls_kms[] = {
>  	DRM_IOCTL_DEF_DRV(RADEON_CP_INIT, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
>  	DRM_IOCTL_DEF_DRV(RADEON_CP_START, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 38f5cc740cd1..2acfecc5b811 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -270,19 +270,6 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  	return ret;
>  }
>  
> -bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> -				  int *max_error, struct timeval *vblank_time,
> -				  bool in_vblank_irq)
> -{
> -	struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
> -	struct drm_crtc_state *state = crtc->state;
> -
> -	/* Helper routine in DRM core does all the work: */
> -	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc_id, max_error,
> -						     vblank_time, in_vblank_irq,
> -						     &state->adjusted_mode);
> -}
> -
>  static void vc4_crtc_destroy(struct drm_crtc *crtc)
>  {
>  	drm_crtc_cleanup(crtc);
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
> index 61e674baf3a6..e864256e12e5 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.c
> +++ b/drivers/gpu/drm/vc4/vc4_drv.c
> @@ -154,7 +154,7 @@ static struct drm_driver vc4_drm_driver = {
>  	.irq_uninstall = vc4_irq_uninstall,
>  
>  	.get_scanout_position = vc4_crtc_get_scanoutpos,
> -	.get_vblank_timestamp = vc4_crtc_get_vblank_timestamp,
> +	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
>  
>  #if defined(CONFIG_DEBUG_FS)
>  	.debugfs_init = vc4_debugfs_init,
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 815cdeb54971..64c92e0eb8f7 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -450,9 +450,6 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  			    unsigned int flags, int *vpos, int *hpos,
>  			    ktime_t *stime, ktime_t *etime,
>  			    const struct drm_display_mode *mode);
> -bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> -				  int *max_error, struct timeval *vblank_time,
> -				  bool in_vblank_irq);
>  
>  /* vc4_debugfs.c */
>  int vc4_debugfs_init(struct drm_minor *minor);
> diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
> index 445406efb8dc..b489cc856e7a 100644
> --- a/include/drm/drm_irq.h
> +++ b/include/drm/drm_irq.h
> @@ -121,6 +121,18 @@ struct drm_vblank_crtc {
>  	 * drm_calc_timestamping_constants().
>  	 */
>  	int linedur_ns;
> +
> +	/**
> +	 * @hwmode:
> +	 *
> +	 * Cache of the current hardware display mode. Only valide when @enabled
s/valide/valid/
> +	 * is set. This is used by helpers like
> +	 * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
> +	 * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
> +	 * because that one is really hard to get at from interrupt context.
s/at from/from/
> +	 */
> +	struct drm_display_mode hwmode;
> +
>  	/**
>  	 * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
>  	 * avoid double-disabling and hence corrupting saved state. Needed by
> @@ -156,8 +168,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
>  bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  					   unsigned int pipe, int *max_error,
>  					   struct timeval *vblank_time,
> -					   bool in_vblank_irq,
> -					   const struct drm_display_mode *mode);
> +					   bool in_vblank_irq);
>  void drm_calc_timestamping_constants(struct drm_crtc *crtc,
>  				     const struct drm_display_mode *mode);
>  
> 

With the typo fixes,
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 09/11] drm/vblank: Simplify the get_scanout_position helper hook

[Daniel Vetter]

- We can drop the different return value flags, the only caller only
  cares about whether the scanout position is valid or not. Also, it's
  entirely undefined what "accurate" means, if we'd really care we
  should probably wire the max_error through. But since we never even
  report this to userspace it's kinda moot.

- Drop all the fancy input flags, there's really only the "called from
  vblank irq" one. Well except for radeon/amdgpu, which added their
  own private flags.

Since amdgpu/radoen also use the scanoutposition function internally I
just gave them a tiny wrapper, plus copies of all the old #defines
they need. Everyone else gets simplified code.

Note how we could remove a lot of error conditions if we'd move this
helper hook to drm_crtc_helper_funcs and would pass it a crtc
directly.

v2: Make it compile on arm.

v3: Squash in fixup from 0day.

Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c   | 12 +++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h  |  3 +++
 drivers/gpu/drm/drm_irq.c                 | 16 ++++++++--------
 drivers/gpu/drm/i915/i915_irq.c           | 19 ++++++-------------
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   | 19 +++++++------------
 drivers/gpu/drm/nouveau/nouveau_display.c | 18 ++++++++----------
 drivers/gpu/drm/nouveau/nouveau_display.h |  6 +++---
 drivers/gpu/drm/radeon/radeon_drv.c       | 12 +++++++++++-
 drivers/gpu/drm/radeon/radeon_mode.h      |  3 +++
 drivers/gpu/drm/vc4/vc4_crtc.c            | 21 ++++++++++-----------
 drivers/gpu/drm/vc4/vc4_drv.h             |  8 ++++----
 include/drm/drmP.h                        |  8 --------
 include/drm/drm_drv.h                     | 26 ++++++++++----------------
 13 files changed, 84 insertions(+), 87 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 40dd5d19f835..98bde673ae3e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -711,6 +711,16 @@ static const struct file_operations amdgpu_driver_kms_fops = {
 #endif
 };
 
+static bool
+amdgpu_get_crtc_scanout_position(struct drm_device *dev, unsigned int pipe,
+				 bool in_vblank_irq, int *vpos, int *hpos,
+				 ktime_t *stime, ktime_t *etime,
+				 const struct drm_display_mode *mode)
+{
+	return amdgpu_get_crtc_scanoutpos(dev, pipe, 0, vpos, hpos,
+					  stime, etime, mode);
+}
+
 static struct drm_driver kms_driver = {
 	.driver_features =
 	    DRIVER_USE_AGP |
@@ -726,7 +736,7 @@ static struct drm_driver kms_driver = {
 	.enable_vblank = amdgpu_enable_vblank_kms,
 	.disable_vblank = amdgpu_disable_vblank_kms,
 	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
-	.get_scanout_position = amdgpu_get_crtc_scanoutpos,
+	.get_scanout_position = amdgpu_get_crtc_scanout_position,
 #if defined(CONFIG_DEBUG_FS)
 	.debugfs_init = amdgpu_debugfs_init,
 #endif
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
index db8f8dda209c..20d6522fd7b4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
@@ -534,6 +534,9 @@ struct amdgpu_framebuffer {
 				((em) == ATOM_ENCODER_MODE_DP_MST))
 
 /* Driver internal use only flags of amdgpu_get_crtc_scanoutpos() */
+#define DRM_SCANOUTPOS_VALID        (1 << 0)
+#define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
+#define DRM_SCANOUTPOS_ACCURATE     (1 << 2)
 #define USE_REAL_VBLANKSTART		(1 << 30)
 #define GET_DISTANCE_TO_VBLANKSTART	(1 << 31)
 
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 992eb3719c3e..6e04d05455f9 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -744,13 +744,12 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 {
 	struct timeval tv_etime;
 	ktime_t stime, etime;
-	unsigned int vbl_status;
+	bool vbl_status;
 	struct drm_crtc *crtc;
 	const struct drm_display_mode *mode;
 	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 	int vpos, hpos, i;
 	int delta_ns, duration_ns;
-	unsigned flags = in_vblank_irq ? DRM_CALLED_FROM_VBLIRQ : 0;
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		return false;
@@ -793,15 +792,16 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 		 * Get vertical and horizontal scanout position vpos, hpos,
 		 * and bounding timestamps stime, etime, pre/post query.
 		 */
-		vbl_status = dev->driver->get_scanout_position(dev, pipe, flags,
+		vbl_status = dev->driver->get_scanout_position(dev, pipe,
+							       in_vblank_irq,
 							       &vpos, &hpos,
 							       &stime, &etime,
 							       mode);
 
 		/* Return as no-op if scanout query unsupported or failed. */
-		if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
-			DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n",
-				  pipe, vbl_status);
+		if (!vbl_status) {
+			DRM_DEBUG("crtc %u : scanoutpos query failed.\n",
+				  pipe);
 			return false;
 		}
 
@@ -840,8 +840,8 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 	etime = ktime_sub_ns(etime, delta_ns);
 	*vblank_time = ktime_to_timeval(etime);
 
-	DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
-		      pipe, vbl_status, hpos, vpos,
+	DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
+		      pipe, hpos, vpos,
 		      (long)tv_etime.tv_sec, (long)tv_etime.tv_usec,
 		      (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
 		      duration_ns/1000, i);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index fdb1162427a9..6477bbd85772 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -827,10 +827,10 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
 	return (position + crtc->scanline_offset) % vtotal;
 }
 
-static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
-				    unsigned int flags, int *vpos, int *hpos,
-				    ktime_t *stime, ktime_t *etime,
-				    const struct drm_display_mode *mode)
+static bool i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
+				     bool in_vblank_irq, int *vpos, int *hpos,
+				     ktime_t *stime, ktime_t *etime,
+				     const struct drm_display_mode *mode)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_crtc *intel_crtc = intel_get_crtc_for_pipe(dev_priv,
@@ -838,13 +838,12 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	int position;
 	int vbl_start, vbl_end, hsync_start, htotal, vtotal;
 	bool in_vbl = true;
-	int ret = 0;
 	unsigned long irqflags;
 
 	if (WARN_ON(!mode->crtc_clock)) {
 		DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
 				 "pipe %c\n", pipe_name(pipe));
-		return 0;
+		return false;
 	}
 
 	htotal = mode->crtc_htotal;
@@ -859,8 +858,6 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
 		vtotal /= 2;
 	}
 
-	ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
-
 	/*
 	 * Lock uncore.lock, as we will do multiple timing critical raw
 	 * register reads, potentially with preemption disabled, so the
@@ -944,11 +941,7 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
 		*hpos = position - (*vpos * htotal);
 	}
 
-	/* In vblank? */
-	if (in_vbl)
-		ret |= DRM_SCANOUTPOS_IN_VBLANK;
-
-	return ret;
+	return true;
 }
 
 int intel_get_crtc_scanline(struct intel_crtc *crtc)
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index 6ba216b8bba9..959b826123a2 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -530,31 +530,28 @@ static struct drm_encoder *get_encoder_from_crtc(struct drm_crtc *crtc)
 	return NULL;
 }
 
-static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
-			       unsigned int flags, int *vpos, int *hpos,
-			       ktime_t *stime, ktime_t *etime,
-			       const struct drm_display_mode *mode)
+static bool mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
+				bool in_vblank_irq, int *vpos, int *hpos,
+				ktime_t *stime, ktime_t *etime,
+				const struct drm_display_mode *mode)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct drm_crtc *crtc;
 	struct drm_encoder *encoder;
 	int line, vsw, vbp, vactive_start, vactive_end, vfp_end;
-	int ret = 0;
 
 	crtc = priv->crtcs[pipe];
 	if (!crtc) {
 		DRM_ERROR("Invalid crtc %d\n", pipe);
-		return 0;
+		return false;
 	}
 
 	encoder = get_encoder_from_crtc(crtc);
 	if (!encoder) {
 		DRM_ERROR("no encoder found for crtc %d\n", pipe);
-		return 0;
+		return false;
 	}
 
-	ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
-
 	vsw = mode->crtc_vsync_end - mode->crtc_vsync_start;
 	vbp = mode->crtc_vtotal - mode->crtc_vsync_end;
 
@@ -578,10 +575,8 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
 
 	if (line < vactive_start) {
 		line -= vactive_start;
-		ret |= DRM_SCANOUTPOS_IN_VBLANK;
 	} else if (line > vactive_end) {
 		line = line - vfp_end - vactive_start;
-		ret |= DRM_SCANOUTPOS_IN_VBLANK;
 	} else {
 		line -= vactive_start;
 	}
@@ -592,7 +587,7 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
 	if (etime)
 		*etime = ktime_get();
 
-	return ret;
+	return true;
 }
 
 static u32 mdp5_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 33d0a6175d44..16110be3aba8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -98,7 +98,7 @@ calc(int blanks, int blanke, int total, int line)
 	return line;
 }
 
-static int
+static bool
 nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos,
 				ktime_t *stime, ktime_t *etime)
 {
@@ -111,16 +111,16 @@ nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos,
 	};
 	struct nouveau_display *disp = nouveau_display(crtc->dev);
 	struct drm_vblank_crtc *vblank = &crtc->dev->vblank[drm_crtc_index(crtc)];
-	int ret, retry = 1;
+	int retry = 1;
+	bool ret = false;
 
 	do {
 		ret = nvif_mthd(&disp->disp, 0, &args, sizeof(args));
 		if (ret != 0)
-			return 0;
+			return false;
 
 		if (args.scan.vline) {
-			ret |= DRM_SCANOUTPOS_ACCURATE;
-			ret |= DRM_SCANOUTPOS_VALID;
+			ret = true;
 			break;
 		}
 
@@ -133,14 +133,12 @@ nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos,
 	if (stime) *stime = ns_to_ktime(args.scan.time[0]);
 	if (etime) *etime = ns_to_ktime(args.scan.time[1]);
 
-	if (*vpos < 0)
-		ret |= DRM_SCANOUTPOS_IN_VBLANK;
 	return ret;
 }
 
-int
+bool
 nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
-			   unsigned int flags, int *vpos, int *hpos,
+			   bool in_vblank_irq, int *vpos, int *hpos,
 			   ktime_t *stime, ktime_t *etime,
 			   const struct drm_display_mode *mode)
 {
@@ -153,7 +151,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
 		}
 	}
 
-	return 0;
+	return false;
 }
 
 static void
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index a8285c2747a9..201aec2ea5b8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -68,9 +68,9 @@ int  nouveau_display_suspend(struct drm_device *dev, bool runtime);
 void nouveau_display_resume(struct drm_device *dev, bool runtime);
 int  nouveau_display_vblank_enable(struct drm_device *, unsigned int);
 void nouveau_display_vblank_disable(struct drm_device *, unsigned int);
-int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
-				unsigned int, int *, int *, ktime_t *,
-				ktime_t *, const struct drm_display_mode *);
+bool  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
+				 bool, int *, int *, ktime_t *,
+				 ktime_t *, const struct drm_display_mode *);
 
 int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 			    struct drm_pending_vblank_event *event,
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 50d97f12e7bf..ef8a75940980 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -526,6 +526,16 @@ static const struct file_operations radeon_driver_kms_fops = {
 #endif
 };
 
+static bool
+radeon_get_crtc_scanout_position(struct drm_device *dev, unsigned int pipe,
+				 bool in_vblank_irq, int *vpos, int *hpos,
+				 ktime_t *stime, ktime_t *etime,
+				 const struct drm_display_mode *mode)
+{
+	return radeon_get_crtc_scanoutpos(dev, pipe, 0, vpos, hpos,
+					  stime, etime, mode);
+}
+
 static struct drm_driver kms_driver = {
 	.driver_features =
 	    DRIVER_USE_AGP |
@@ -541,7 +551,7 @@ static struct drm_driver kms_driver = {
 	.enable_vblank = radeon_enable_vblank_kms,
 	.disable_vblank = radeon_disable_vblank_kms,
 	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
-	.get_scanout_position = radeon_get_crtc_scanoutpos,
+	.get_scanout_position = radeon_get_crtc_scanout_position,
 	.irq_preinstall = radeon_driver_irq_preinstall_kms,
 	.irq_postinstall = radeon_driver_irq_postinstall_kms,
 	.irq_uninstall = radeon_driver_irq_uninstall_kms,
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index ad282648fc8b..00f5ec5c12c7 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -691,6 +691,9 @@ struct atom_voltage_table
 };
 
 /* Driver internal use only flags of radeon_get_crtc_scanoutpos() */
+#define DRM_SCANOUTPOS_VALID        (1 << 0)
+#define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
+#define DRM_SCANOUTPOS_ACCURATE     (1 << 2)
 #define USE_REAL_VBLANKSTART 		(1 << 30)
 #define GET_DISTANCE_TO_VBLANKSTART	(1 << 31)
 
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 2acfecc5b811..04c390a487ba 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -151,10 +151,10 @@ int vc4_crtc_debugfs_regs(struct seq_file *m, void *unused)
 }
 #endif
 
-int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
-			    unsigned int flags, int *vpos, int *hpos,
-			    ktime_t *stime, ktime_t *etime,
-			    const struct drm_display_mode *mode)
+bool vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
+			     bool in_vblank_irq, int *vpos, int *hpos,
+			     ktime_t *stime, ktime_t *etime,
+			     const struct drm_display_mode *mode)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
@@ -162,7 +162,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 	u32 val;
 	int fifo_lines;
 	int vblank_lines;
-	int ret = 0;
+	bool ret = false;
 
 	/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
 
@@ -198,7 +198,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 	fifo_lines = vc4_crtc->cob_size / mode->crtc_hdisplay;
 
 	if (fifo_lines > 0)
-		ret |= DRM_SCANOUTPOS_VALID;
+		ret = true;
 
 	/* HVS more than fifo_lines into frame for compositing? */
 	if (*vpos > fifo_lines) {
@@ -216,7 +216,6 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 		 */
 		*vpos -= fifo_lines + 1;
 
-		ret |= DRM_SCANOUTPOS_ACCURATE;
 		return ret;
 	}
 
@@ -229,10 +228,9 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 	 * We can't get meaningful readings wrt. scanline position of the PV
 	 * and need to make things up in a approximative but consistent way.
 	 */
-	ret |= DRM_SCANOUTPOS_IN_VBLANK;
 	vblank_lines = mode->vtotal - mode->vdisplay;
 
-	if (flags & DRM_CALLED_FROM_VBLIRQ) {
+	if (in_vblank_irq) {
 		/*
 		 * Assume the irq handler got called close to first
 		 * line of vblank, so PV has about a full vblank
@@ -254,9 +252,10 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 		 * we are at the very beginning of vblank, as the hvs just
 		 * started refilling, and the stime and etime timestamps
 		 * truly correspond to start of vblank.
+		 *
+		 * Unfortunately there's no way to report this to upper levels
+		 * and make it more useful.
 		 */
-		if ((val & SCALER_DISPSTATX_FULL) != SCALER_DISPSTATX_FULL)
-			ret |= DRM_SCANOUTPOS_ACCURATE;
 	} else {
 		/*
 		 * No clue where we are inside vblank. Return a vpos of zero,
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 64c92e0eb8f7..c34a0915e49d 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -446,10 +446,10 @@ int vc4_bo_stats_debugfs(struct seq_file *m, void *arg);
 extern struct platform_driver vc4_crtc_driver;
 bool vc4_event_pending(struct drm_crtc *crtc);
 int vc4_crtc_debugfs_regs(struct seq_file *m, void *arg);
-int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
-			    unsigned int flags, int *vpos, int *hpos,
-			    ktime_t *stime, ktime_t *etime,
-			    const struct drm_display_mode *mode);
+bool vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
+			     bool in_vblank_irq, int *vpos, int *hpos,
+			     ktime_t *stime, ktime_t *etime,
+			     const struct drm_display_mode *mode);
 
 /* vc4_debugfs.c */
 int vc4_debugfs_init(struct drm_minor *minor);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 1b3f3cd7b230..6c7ea497e3a6 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -321,14 +321,6 @@ struct pci_controller;
 #define DRM_IF_VERSION(maj, min) (maj << 16 | min)
 
 
-/* Flags and return codes for get_vblank_timestamp() driver function. */
-#define DRM_CALLED_FROM_VBLIRQ 1
-
-/* get_scanout_position() return flags */
-#define DRM_SCANOUTPOS_VALID        (1 << 0)
-#define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
-#define DRM_SCANOUTPOS_ACCURATE     (1 << 2)
-
 /**
  * DRM device structure. This structure represent a complete card that
  * may contain multiple heads.
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 0a367cf5d8d5..e64e33b9dd26 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -241,8 +241,10 @@ struct drm_driver {
 	 *     DRM device.
 	 * pipe:
 	 *     Id of the crtc to query.
-	 * flags:
-	 *     Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
+	 * in_vblank_irq:
+	 *     True when called from drm_crtc_handle_vblank().  Some drivers
+	 *     need to apply some workarounds for gpu-specific vblank irq quirks
+	 *     if flag is set.
 	 * vpos:
 	 *     Target location for current vertical scanout position.
 	 * hpos:
@@ -263,16 +265,8 @@ struct drm_driver {
 	 *
 	 * Returns:
 	 *
-	 * Flags, or'ed together as follows:
-	 *
-	 * DRM_SCANOUTPOS_VALID:
-	 *     Query successful.
-	 * DRM_SCANOUTPOS_INVBL:
-	 *     Inside vblank.
-	 * DRM_SCANOUTPOS_ACCURATE: Returned position is accurate. A lack of
-	 *     this flag means that returned position may be offset by a
-	 *     constant but unknown small number of scanlines wrt. real scanout
-	 *     position.
+	 * True on success, false if a reliable scanout position counter could
+	 * not be read out.
 	 *
 	 * FIXME:
 	 *
@@ -280,10 +274,10 @@ struct drm_driver {
 	 * move it to &struct drm_crtc_helper_funcs, like all the other
 	 * helper-internal hooks.
 	 */
-	int (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
-				     unsigned int flags, int *vpos, int *hpos,
-				     ktime_t *stime, ktime_t *etime,
-				     const struct drm_display_mode *mode);
+	bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
+				      bool in_vblank_irq, int *vpos, int *hpos,
+				      ktime_t *stime, ktime_t *etime,
+				      const struct drm_display_mode *mode);
 
 	/**
 	 * @get_vblank_timestamp:
-- 
2.11.0

_______________________________________________
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Freedreno@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/freedreno

Re: [PATCH 09/11] drm/vblank: Simplify the get_scanout_position helper hook

[Neil Armstrong]

On 04/04/2017 11:53 AM, Daniel Vetter wrote:
> - We can drop the different return value flags, the only caller only
>   cares about whether the scanout position is valid or not. Also, it's
>   entirely undefined what "accurate" means, if we'd really care we
>   should probably wire the max_error through. But since we never even
>   report this to userspace it's kinda moot.
> 
> - Drop all the fancy input flags, there's really only the "called from
>   vblank irq" one. Well except for radeon/amdgpu, which added their
>   own private flags.
> 
> Since amdgpu/radoen also use the scanoutposition function internally I
> just gave them a tiny wrapper, plus copies of all the old #defines
> they need. Everyone else gets simplified code.
> 
> Note how we could remove a lot of error conditions if we'd move this
> helper hook to drm_crtc_helper_funcs and would pass it a crtc
> directly.
> 
> v2: Make it compile on arm.
> 
> v3: Squash in fixup from 0day.
> 
> Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Ben Skeggs <bskeggs@redhat.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c   | 12 +++++++++++-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h  |  3 +++
>  drivers/gpu/drm/drm_irq.c                 | 16 ++++++++--------
>  drivers/gpu/drm/i915/i915_irq.c           | 19 ++++++-------------
>  drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   | 19 +++++++------------
>  drivers/gpu/drm/nouveau/nouveau_display.c | 18 ++++++++----------
>  drivers/gpu/drm/nouveau/nouveau_display.h |  6 +++---
>  drivers/gpu/drm/radeon/radeon_drv.c       | 12 +++++++++++-
>  drivers/gpu/drm/radeon/radeon_mode.h      |  3 +++
>  drivers/gpu/drm/vc4/vc4_crtc.c            | 21 ++++++++++-----------
>  drivers/gpu/drm/vc4/vc4_drv.h             |  8 ++++----
>  include/drm/drmP.h                        |  8 --------
>  include/drm/drm_drv.h                     | 26 ++++++++++----------------
>  13 files changed, 84 insertions(+), 87 deletions(-)
> 

[...]

> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 2acfecc5b811..04c390a487ba 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -151,10 +151,10 @@ int vc4_crtc_debugfs_regs(struct seq_file *m, void *unused)
>  }
>  #endif
>  
> -int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
> -			    unsigned int flags, int *vpos, int *hpos,
> -			    ktime_t *stime, ktime_t *etime,
> -			    const struct drm_display_mode *mode)
> +bool vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
> +			     bool in_vblank_irq, int *vpos, int *hpos,
> +			     ktime_t *stime, ktime_t *etime,
> +			     const struct drm_display_mode *mode)
>  {
>  	struct vc4_dev *vc4 = to_vc4_dev(dev);
>  	struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
> @@ -162,7 +162,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  	u32 val;
>  	int fifo_lines;
>  	int vblank_lines;
> -	int ret = 0;
> +	bool ret = false;
>  
>  	/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
>  
> @@ -198,7 +198,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  	fifo_lines = vc4_crtc->cob_size / mode->crtc_hdisplay;
>  
>  	if (fifo_lines > 0)
> -		ret |= DRM_SCANOUTPOS_VALID;
> +		ret = true;
>  
>  	/* HVS more than fifo_lines into frame for compositing? */
>  	if (*vpos > fifo_lines) {
> @@ -216,7 +216,6 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  		 */
>  		*vpos -= fifo_lines + 1;
>  
> -		ret |= DRM_SCANOUTPOS_ACCURATE;
>  		return ret;
>  	}
>  
> @@ -229,10 +228,9 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  	 * We can't get meaningful readings wrt. scanline position of the PV
>  	 * and need to make things up in a approximative but consistent way.
>  	 */
> -	ret |= DRM_SCANOUTPOS_IN_VBLANK;
>  	vblank_lines = mode->vtotal - mode->vdisplay;
>  
> -	if (flags & DRM_CALLED_FROM_VBLIRQ) {
> +	if (in_vblank_irq) {

Shouldn't this go in patch 06/11 ?

>  		/*
>  		 * Assume the irq handler got called close to first
>  		 * line of vblank, so PV has about a full vblank
> @@ -254,9 +252,10 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  		 * we are at the very beginning of vblank, as the hvs just
>  		 * started refilling, and the stime and etime timestamps
>  		 * truly correspond to start of vblank.
> +		 *
> +		 * Unfortunately there's no way to report this to upper levels
> +		 * and make it more useful.
>  		 */
> -		if ((val & SCALER_DISPSTATX_FULL) != SCALER_DISPSTATX_FULL)
> -			ret |= DRM_SCANOUTPOS_ACCURATE;
>  	} else {
>  		/*
>  		 * No clue where we are inside vblank. Return a vpos of zero,
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 64c92e0eb8f7..c34a0915e49d 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -446,10 +446,10 @@ int vc4_bo_stats_debugfs(struct seq_file *m, void *arg);
>  extern struct platform_driver vc4_crtc_driver;
>  bool vc4_event_pending(struct drm_crtc *crtc);
>  int vc4_crtc_debugfs_regs(struct seq_file *m, void *arg);
> -int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
> -			    unsigned int flags, int *vpos, int *hpos,
> -			    ktime_t *stime, ktime_t *etime,
> -			    const struct drm_display_mode *mode);
> +bool vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
> +			     bool in_vblank_irq, int *vpos, int *hpos,
> +			     ktime_t *stime, ktime_t *etime,
> +			     const struct drm_display_mode *mode);
>  
>  /* vc4_debugfs.c */
>  int vc4_debugfs_init(struct drm_minor *minor);
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 1b3f3cd7b230..6c7ea497e3a6 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -321,14 +321,6 @@ struct pci_controller;
>  #define DRM_IF_VERSION(maj, min) (maj << 16 | min)
>  
>  
> -/* Flags and return codes for get_vblank_timestamp() driver function. */
> -#define DRM_CALLED_FROM_VBLIRQ 1
> -
> -/* get_scanout_position() return flags */
> -#define DRM_SCANOUTPOS_VALID        (1 << 0)
> -#define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
> -#define DRM_SCANOUTPOS_ACCURATE     (1 << 2)
> -
>  /**
>   * DRM device structure. This structure represent a complete card that
>   * may contain multiple heads.
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index 0a367cf5d8d5..e64e33b9dd26 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -241,8 +241,10 @@ struct drm_driver {
>  	 *     DRM device.
>  	 * pipe:
>  	 *     Id of the crtc to query.
> -	 * flags:
> -	 *     Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
> +	 * in_vblank_irq:
> +	 *     True when called from drm_crtc_handle_vblank().  Some drivers
> +	 *     need to apply some workarounds for gpu-specific vblank irq quirks
> +	 *     if flag is set.

Same here, should be in 06/11 ?

>  	 * vpos:
>  	 *     Target location for current vertical scanout position.
>  	 * hpos:
> @@ -263,16 +265,8 @@ struct drm_driver {
>  	 *
>  	 * Returns:
>  	 *
> -	 * Flags, or'ed together as follows:
> -	 *
> -	 * DRM_SCANOUTPOS_VALID:
> -	 *     Query successful.
> -	 * DRM_SCANOUTPOS_INVBL:
> -	 *     Inside vblank.
> -	 * DRM_SCANOUTPOS_ACCURATE: Returned position is accurate. A lack of
> -	 *     this flag means that returned position may be offset by a
> -	 *     constant but unknown small number of scanlines wrt. real scanout
> -	 *     position.
> +	 * True on success, false if a reliable scanout position counter could
> +	 * not be read out.
>  	 *
>  	 * FIXME:
>  	 *
> @@ -280,10 +274,10 @@ struct drm_driver {
>  	 * move it to &struct drm_crtc_helper_funcs, like all the other
>  	 * helper-internal hooks.
>  	 */
> -	int (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
> -				     unsigned int flags, int *vpos, int *hpos,
> -				     ktime_t *stime, ktime_t *etime,
> -				     const struct drm_display_mode *mode);
> +	bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
> +				      bool in_vblank_irq, int *vpos, int *hpos,
> +				      ktime_t *stime, ktime_t *etime,
> +				      const struct drm_display_mode *mode);
>  
>  	/**
>  	 * @get_vblank_timestamp:
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

[PATCH 10/11] drm/vblank: Lock down vblank->hwmode more

[Daniel Vetter]

In the previous patch we've implemented hwmode tracking a la i915 for
the vblank timestamp calculations. But that was just the basic
semantics, i915 has some nice sanity checks to make sure we keep
getting this right. Move them over too.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_irq.c            |  8 +++++++-
 drivers/gpu/drm/i915/i915_irq.c      | 10 ++++++----
 drivers/gpu/drm/i915/intel_display.c | 11 ++---------
 3 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 6e04d05455f9..41e9818666b8 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -775,8 +775,10 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 	/* If mode timing undefined, just return as no-op:
 	 * Happens during initial modesetting of a crtc.
 	 */
-	if (mode->crtc_clock == 0) {
+	if (WARN_ON(mode->crtc_clock == 0)) {
 		DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
+		WARN_ON(drm_drv_uses_atomic_modeset(dev));
+
 		return false;
 	}
 
@@ -1336,6 +1338,10 @@ void drm_crtc_vblank_off(struct drm_crtc *crtc)
 		send_vblank_event(dev, e, seq, &now);
 	}
 	spin_unlock_irqrestore(&dev->event_lock, irqflags);
+
+	/* Will be reset by the modeset helpers when re-enabling the crtc by
+	 * calling drm_calc_timestamping_constants(). */
+	vblank->hwmode.crtc_clock = 0;
 }
 EXPORT_SYMBOL(drm_crtc_vblank_off);
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6477bbd85772..a6046e3e36f5 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -720,9 +720,7 @@ static u32 i915_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	i915_reg_t high_frame, low_frame;
 	u32 high1, high2, low, pixel, vbl_start, hsync_start, htotal;
-	struct intel_crtc *intel_crtc = intel_get_crtc_for_pipe(dev_priv,
-								pipe);
-	const struct drm_display_mode *mode = &intel_crtc->base.hwmode;
+	const struct drm_display_mode *mode = &dev->vblank[pipe].hwmode;
 	unsigned long irqflags;
 
 	htotal = mode->crtc_htotal;
@@ -779,13 +777,17 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
 {
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	const struct drm_display_mode *mode = &crtc->base.hwmode;
+	const struct drm_display_mode *mode;
+	struct drm_vblank_crtc *vblank;
 	enum pipe pipe = crtc->pipe;
 	int position, vtotal;
 
 	if (!crtc->active)
 		return -1;
 
+	vblank = &crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
+	mode = &vblank->hwmode;
+
 	vtotal = mode->crtc_vtotal;
 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 		vtotal /= 2;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 81baa5a9780c..53e732d36fda 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11461,12 +11461,6 @@ intel_modeset_update_crtc_state(struct drm_atomic_state *state)
 	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
 		to_intel_crtc(crtc)->config = to_intel_crtc_state(new_crtc_state);
 
-		/* Update hwmode for vblank functions */
-		if (new_crtc_state->active)
-			crtc->hwmode = new_crtc_state->adjusted_mode;
-		else
-			crtc->hwmode.crtc_clock = 0;
-
 		/*
 		 * Update legacy state to satisfy fbc code. This can
 		 * be removed when fbc uses the atomic state.
@@ -15471,8 +15465,6 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 			to_intel_crtc_state(crtc->base.state);
 		int pixclk = 0;
 
-		crtc->base.hwmode = crtc_state->base.adjusted_mode;
-
 		memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
 		if (crtc_state->base.active) {
 			intel_mode_from_pipe_config(&crtc->base.mode, crtc_state);
@@ -15502,7 +15494,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 			if (IS_BROADWELL(dev_priv) && crtc_state->ips_enabled)
 				pixclk = DIV_ROUND_UP(pixclk * 100, 95);
 
-			drm_calc_timestamping_constants(&crtc->base, &crtc->base.hwmode);
+			drm_calc_timestamping_constants(&crtc->base,
+							&crtc_state->base.adjusted_mode);
 			update_scanline_offset(crtc);
 		}
 
-- 
2.11.0

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Re: [PATCH 10/11] drm/vblank: Lock down vblank->hwmode more

[Neil Armstrong]

On 04/04/2017 11:53 AM, Daniel Vetter wrote:
> In the previous patch we've implemented hwmode tracking a la i915 for
> the vblank timestamp calculations. But that was just the basic
> semantics, i915 has some nice sanity checks to make sure we keep
> getting this right. Move them over too.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/drm_irq.c            |  8 +++++++-
>  drivers/gpu/drm/i915/i915_irq.c      | 10 ++++++----
>  drivers/gpu/drm/i915/intel_display.c | 11 ++---------
>  3 files changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 6e04d05455f9..41e9818666b8 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -775,8 +775,10 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  	/* If mode timing undefined, just return as no-op:
>  	 * Happens during initial modesetting of a crtc.
>  	 */
> -	if (mode->crtc_clock == 0) {
> +	if (WARN_ON(mode->crtc_clock == 0)) {
>  		DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
> +		WARN_ON(drm_drv_uses_atomic_modeset(dev));
> +
>  		return false;
>  	}
>  
> @@ -1336,6 +1338,10 @@ void drm_crtc_vblank_off(struct drm_crtc *crtc)
>  		send_vblank_event(dev, e, seq, &now);
>  	}
>  	spin_unlock_irqrestore(&dev->event_lock, irqflags);
> +
> +	/* Will be reset by the modeset helpers when re-enabling the crtc by
> +	 * calling drm_calc_timestamping_constants(). */
> +	vblank->hwmode.crtc_clock = 0;
>  }
>  EXPORT_SYMBOL(drm_crtc_vblank_off);
>  
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 6477bbd85772..a6046e3e36f5 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -720,9 +720,7 @@ static u32 i915_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
>  	struct drm_i915_private *dev_priv = to_i915(dev);
>  	i915_reg_t high_frame, low_frame;
>  	u32 high1, high2, low, pixel, vbl_start, hsync_start, htotal;
> -	struct intel_crtc *intel_crtc = intel_get_crtc_for_pipe(dev_priv,
> -								pipe);
> -	const struct drm_display_mode *mode = &intel_crtc->base.hwmode;
> +	const struct drm_display_mode *mode = &dev->vblank[pipe].hwmode;
>  	unsigned long irqflags;
>  
>  	htotal = mode->crtc_htotal;
> @@ -779,13 +777,17 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
>  {
>  	struct drm_device *dev = crtc->base.dev;
>  	struct drm_i915_private *dev_priv = to_i915(dev);
> -	const struct drm_display_mode *mode = &crtc->base.hwmode;
> +	const struct drm_display_mode *mode;
> +	struct drm_vblank_crtc *vblank;
>  	enum pipe pipe = crtc->pipe;
>  	int position, vtotal;
>  
>  	if (!crtc->active)
>  		return -1;
>  
> +	vblank = &crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
> +	mode = &vblank->hwmode;
> +
>  	vtotal = mode->crtc_vtotal;
>  	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
>  		vtotal /= 2;
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 81baa5a9780c..53e732d36fda 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11461,12 +11461,6 @@ intel_modeset_update_crtc_state(struct drm_atomic_state *state)
>  	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
>  		to_intel_crtc(crtc)->config = to_intel_crtc_state(new_crtc_state);
>  
> -		/* Update hwmode for vblank functions */
> -		if (new_crtc_state->active)
> -			crtc->hwmode = new_crtc_state->adjusted_mode;
> -		else
> -			crtc->hwmode.crtc_clock = 0;
> -
>  		/*
>  		 * Update legacy state to satisfy fbc code. This can
>  		 * be removed when fbc uses the atomic state.
> @@ -15471,8 +15465,6 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
>  			to_intel_crtc_state(crtc->base.state);
>  		int pixclk = 0;
>  
> -		crtc->base.hwmode = crtc_state->base.adjusted_mode;
> -
>  		memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
>  		if (crtc_state->base.active) {
>  			intel_mode_from_pipe_config(&crtc->base.mode, crtc_state);
> @@ -15502,7 +15494,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
>  			if (IS_BROADWELL(dev_priv) && crtc_state->ips_enabled)
>  				pixclk = DIV_ROUND_UP(pixclk * 100, 95);
>  
> -			drm_calc_timestamping_constants(&crtc->base, &crtc->base.hwmode);
> +			drm_calc_timestamping_constants(&crtc->base,
> +							&crtc_state->base.adjusted_mode);
>  			update_scanline_offset(crtc);
>  		}
>  
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
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[PATCH 11/11] drm/doc: Small markup fixup

[Daniel Vetter]

Drive-by cleanup.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_probe_helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 85005d57bde6..efb5e5e8ce62 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -44,7 +44,7 @@
  *
  * This library provides some helper code for output probing. It provides an
  * implementation of the core &drm_connector_funcs.fill_modes interface with
- * drm_helper_probe_single_connector_modes.
+ * drm_helper_probe_single_connector_modes().
  *
  * It also provides support for polling connectors with a work item and for
  * generic hotplug interrupt handling where the driver doesn't or cannot keep
-- 
2.11.0

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Re: [PATCH 11/11] drm/doc: Small markup fixup

[Neil Armstrong]

On 04/04/2017 11:53 AM, Daniel Vetter wrote:
> Drive-by cleanup.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/drm_probe_helper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> index 85005d57bde6..efb5e5e8ce62 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -44,7 +44,7 @@
>   *
>   * This library provides some helper code for output probing. It provides an
>   * implementation of the core &drm_connector_funcs.fill_modes interface with
> - * drm_helper_probe_single_connector_modes.
> + * drm_helper_probe_single_connector_modes().
>   *
>   * It also provides support for polling connectors with a work item and for
>   * generic hotplug interrupt handling where the driver doesn't or cannot keep
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
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Re: [PATCH 11/11] drm/doc: Small markup fixup

[Daniel Vetter]

On Tue, Apr 04, 2017 at 05:12:59PM +0200, Neil Armstrong wrote:
> On 04/04/2017 11:53 AM, Daniel Vetter wrote:
> > Drive-by cleanup.
> > 
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > ---
> >  drivers/gpu/drm/drm_probe_helper.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> > index 85005d57bde6..efb5e5e8ce62 100644
> > --- a/drivers/gpu/drm/drm_probe_helper.c
> > +++ b/drivers/gpu/drm/drm_probe_helper.c
> > @@ -44,7 +44,7 @@
> >   *
> >   * This library provides some helper code for output probing. It provides an
> >   * implementation of the core &drm_connector_funcs.fill_modes interface with
> > - * drm_helper_probe_single_connector_modes.
> > + * drm_helper_probe_single_connector_modes().
> >   *
> >   * It also provides support for polling connectors with a work item and for
> >   * generic hotplug interrupt handling where the driver doesn't or cannot keep
> > 
> 
> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

I merged the non-vblank patches to drm-misc, thanks a lot for your review.
For the vblank patches I'd like to get some additional review from
Ville/Chris or Mauro, will take all your feedback in on the next round.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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✓ Fi.CI.BAT: success for series starting with [01/11] drm: update todo.rst

[Patchwork]

== Series Details ==

Series: series starting with [01/11] drm: update todo.rst
URL   : https://patchwork.freedesktop.org/series/22416/
State : success

== Summary ==

Series 22416v1 Series without cover letter
https://patchwork.freedesktop.org/api/1.0/series/22416/revisions/1/mbox/

Test gem_exec_flush:
        Subgroup basic-batch-kernel-default-uc:
                fail       -> PASS       (fi-snb-2600) fdo#100007
Test kms_cursor_legacy:
        Subgroup basic-busy-flip-before-cursor-legacy:
                fail       -> PASS       (fi-snb-2600)

fdo#100007 https://bugs.freedesktop.org/show_bug.cgi?id=100007

fi-bdw-5557u     total:278  pass:267  dwarn:0   dfail:0   fail:0   skip:11  time: 429s
fi-bdw-gvtdvm    total:278  pass:256  dwarn:8   dfail:0   fail:0   skip:14  time: 429s
fi-bsw-n3050     total:278  pass:239  dwarn:0   dfail:0   fail:0   skip:39  time: 578s
fi-bxt-j4205     total:278  pass:259  dwarn:0   dfail:0   fail:0   skip:19  time: 510s
fi-bxt-t5700     total:278  pass:258  dwarn:0   dfail:0   fail:0   skip:20  time: 547s
fi-byt-j1900     total:278  pass:251  dwarn:0   dfail:0   fail:0   skip:27  time: 491s
fi-byt-n2820     total:278  pass:247  dwarn:0   dfail:0   fail:0   skip:31  time: 480s
fi-hsw-4770      total:278  pass:262  dwarn:0   dfail:0   fail:0   skip:16  time: 410s
fi-hsw-4770r     total:278  pass:262  dwarn:0   dfail:0   fail:0   skip:16  time: 409s
fi-ilk-650       total:278  pass:228  dwarn:0   dfail:0   fail:0   skip:50  time: 419s
fi-ivb-3520m     total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 495s
fi-ivb-3770      total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 470s
fi-kbl-7500u     total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 461s
fi-kbl-7560u     total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10  time: 568s
fi-skl-6260u     total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10  time: 449s
fi-skl-6700hq    total:278  pass:261  dwarn:0   dfail:0   fail:0   skip:17  time: 568s
fi-skl-6700k     total:278  pass:256  dwarn:4   dfail:0   fail:0   skip:18  time: 464s
fi-skl-6770hq    total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10  time: 495s
fi-skl-gvtdvm    total:278  pass:265  dwarn:0   dfail:0   fail:0   skip:13  time: 433s
fi-snb-2520m     total:278  pass:250  dwarn:0   dfail:0   fail:0   skip:28  time: 532s
fi-snb-2600      total:278  pass:249  dwarn:0   dfail:0   fail:0   skip:29  time: 402s

abec0508865ae60a2bb30ca3ba5ca2c4ac49afc5 drm-tip: 2017y-04m-04d-08h-52m-39s UTC integration manifest
b5be21f drm/doc: Small markup fixup
5c9a503 drm/vblank: Lock down vblank->hwmode more
3a4ff8c drm/vblank: Simplify the get_scanout_position helper hook
a5c47cc drm/vblank: drop the mode argument from drm_calc_vbltimestamp_from_scanoutpos
f5a5684 drm/vblank: Add FIXME comments about moving the vblank ts hooks
b1d1c26 drm/vblank: Switch to bool in_vblank_irq in get_vblank_timestamp
438e065 drm/vblank: Switch drm_driver->get_vblank_timestamp to return a bool
34f0357 drm: document drm_ioctl.[hc]
b0d3172 drm: Extract drm_ioctl.h
5fad68c drm: Consolidate and document sysfs support
90b0b70 drm: update todo.rst

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_4388/
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Re: [PATCH 01/11] drm: update todo.rst

[Neil Armstrong]

On 04/04/2017 11:52 AM, Daniel Vetter wrote:
> Just drive-by, but we have gsoc running so better to update it now.
> 
> Great news is that two entries can be removed because essentially all
> done.
> 
> v2: Keep a bunch of the todos, Gabriel is working on them.
> 
> Cc: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  Documentation/gpu/todo.rst | 31 ++++---------------------------
>  1 file changed, 4 insertions(+), 27 deletions(-)
> 
> diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
> index e255b36b34a3..1bdb7356a310 100644
> --- a/Documentation/gpu/todo.rst
> +++ b/Documentation/gpu/todo.rst
> @@ -16,7 +16,7 @@ De-midlayer drivers
>  With the recent ``drm_bus`` cleanup patches for 3.17 it is no longer required
>  to have a ``drm_bus`` structure set up. Drivers can directly set up the
>  ``drm_device`` structure instead of relying on bus methods in ``drm_usb.c``
> -and ``drm_platform.c``. The goal is to get rid of the driver's ``->load`` /
> +and ``drm_pci.c``. The goal is to get rid of the driver's ``->load`` /
>  ``->unload`` callbacks and open-code the load/unload sequence properly, using
>  the new two-stage ``drm_device`` setup/teardown.
>  
> @@ -175,7 +175,7 @@ fine-grained per-buffer object and per-context lockings scheme. Currently the
>  following drivers still use ``struct_mutex``: ``msm``, ``omapdrm`` and
>  ``udl``.
>  
> -Contact: Daniel Vetter
> +Contact: Daniel Vetter, respective driver maintainers
>  
>  Switch to drm_connector_list_iter for any connector_list walking
>  ----------------------------------------------------------------
> @@ -217,6 +217,8 @@ plan is to switch to per-file driver API headers, which will also structure
>  the kerneldoc better. This should also allow more fine-grained ``#include``
>  directives.
>  
> +In the end no .c file should need to include ``drmP.h`` anymore.
> +
>  Contact: Daniel Vetter
>  
>  Add missing kerneldoc for exported functions
> @@ -244,13 +246,8 @@ be hidden so that driver writers don't accidentally end up using it. And to
>  prevent security issues in those legacy IOCTLs from being exploited on modern
>  drivers. This has multiple possible subtasks:
>  
> -* Make sure legacy IOCTLs can't be used on modern drivers.
>  * Extract support code for legacy features into a ``drm-legacy.ko`` kernel
>    module and compile it only when one of the legacy drivers is enabled.
> -* Extract legacy functions into their own headers and remove it that from the
> -  monolithic ``drmP.h`` header.
> -* Remove any lingering cruft from the OS abstraction layer from modern
> -  drivers.
>  
>  This is mostly done, the only thing left is to split up ``drm_irq.c`` into
>  legacy cruft and the parts needed by modern KMS drivers.
> @@ -408,23 +405,3 @@ Contact: Noralf Trønnes, Daniel Vetter
>  
>  Outside DRM
>  ===========
> -
> -Better kerneldoc
> -----------------
> -
> -This is pretty much done, but there's some advanced topics:
> -
> -Come up with a way to hyperlink to struct members. Currently you can hyperlink
> -to the struct using ``#struct_name``, but not to a member within. Would need
> -buy-in from kerneldoc maintainers, and the big question is how to make it work
> -without totally unsightly
> -``drm_foo_bar_really_long_structure->even_longer_memeber`` all over the text
> -which breaks text flow.
> -
> -Figure out how to integrate the asciidoc support for ascii-diagrams. We have a
> -few of those (e.g. to describe mode timings), and asciidoc supports converting
> -some ascii-art dialect into pngs. Would be really pretty to make that work.
> -
> -Contact: Daniel Vetter, Jani Nikula
> -
> -Jani is working on this already, hopefully lands in 4.8.
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
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