[PATCH v5 0/5] Adding driver-private objects to atomic state

[PATCH v5 0/5] Adding driver-private objects to atomic state

[Dhinakaran Pandiyan]

Changes in this version:
Included the 5 left over patches. Patches 1 and 5 have changed, so
I have removed Maarten's R-B for patch 5.

	1/5: Added NULL checks
	5/5: Fixed vcpi slot accounting when atomic_release() is called multiple
	times within an atomic_check()

This series introduces void * type driver-private objects in core and adds
helper functions that operate on these private objects. Drivers need to
implement object-specific functions to swap and clear object states. The
advantage of having void * for these objects in the core is objects of different
types can be managed in the same atomic state array. The series implements
DP-MST link bw tracking using the driver-private object infrastructure.

Pandiyan, Dhinakaran (5):
  drm: Add driver-private objects to atomic state
  drm/dp: Introduce MST topology state to track available link bandwidth
  drm/dp: Add DP MST helpers to atomically find and release vcpi slots
  drm: Connector helper function to release resources
  drm/dp: Track MST link bandwidth

 drivers/gpu/drm/drm_atomic.c             |  65 ++++++++++++++
 drivers/gpu/drm/drm_atomic_helper.c      |  24 +++++
 drivers/gpu/drm/drm_dp_mst_topology.c    | 150 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_dp_mst.c      |  48 ++++++++--
 include/drm/drm_atomic.h                 |  92 +++++++++++++++++++
 include/drm/drm_dp_mst_helper.h          |  26 ++++++
 include/drm/drm_modeset_helper_vtables.h |  16 ++++
 7 files changed, 414 insertions(+), 7 deletions(-)

-- 
2.7.4

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[PATCH v5 1/5] drm: Add driver-private objects to atomic state

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

It is necessary to track states for objects other than connector, crtc
and plane for atomic modesets. But adding objects like DP MST link
bandwidth to drm_atomic_state would mean that a non-core object will be
modified by the core helper functions for swapping and clearing
it's state. So, lets add void * objects and helper functions that operate
on void * types to keep these objects and states private to the core.
Drivers can then implement specific functions to swap and clear states.
The other advantage having just void * for these objects in
drm_atomic_state is that objects of different types can be managed in the
same state array.

v5: Remove more NULL checks (Maarten)
v4: Avoid redundant NULL checks when private_objs array is empty (Maarten)
v3: Macro alignment (Chris)
v2: Added docs and new iterator to filter private objects (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>

Acked-by: Harry Wentland <harry.wentland@amd.com>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_atomic.c        | 65 ++++++++++++++++++++++++++
 drivers/gpu/drm/drm_atomic_helper.c |  5 ++
 include/drm/drm_atomic.h            | 92 +++++++++++++++++++++++++++++++++++++
 3 files changed, 162 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 9b892af..4d37019 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -57,6 +57,7 @@ void drm_atomic_state_default_release(struct drm_atomic_state *state)
 	kfree(state->connectors);
 	kfree(state->crtcs);
 	kfree(state->planes);
+	kfree(state->private_objs);
 }
 EXPORT_SYMBOL(drm_atomic_state_default_release);
 
@@ -184,6 +185,17 @@ void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 		state->planes[i].ptr = NULL;
 		state->planes[i].state = NULL;
 	}
+
+	for (i = 0; i < state->num_private_objs; i++) {
+		void *obj_state = state->private_objs[i].obj_state;
+
+		state->private_objs[i].funcs->destroy_state(obj_state);
+		state->private_objs[i].obj = NULL;
+		state->private_objs[i].obj_state = NULL;
+		state->private_objs[i].funcs = NULL;
+	}
+	state->num_private_objs = 0;
+
 }
 EXPORT_SYMBOL(drm_atomic_state_default_clear);
 
@@ -978,6 +990,59 @@ static void drm_atomic_plane_print_state(struct drm_printer *p,
 }
 
 /**
+ * drm_atomic_get_private_obj_state - get private object state
+ * @state: global atomic state
+ * @obj: private object to get the state for
+ * @funcs: pointer to the struct of function pointers that identify the object
+ * type
+ *
+ * This function returns the private object state for the given private object,
+ * allocating the state if needed. It does not grab any locks as the caller is
+ * expected to care of any required locking.
+ *
+ * RETURNS:
+ *
+ * Either the allocated state or the error code encoded into a pointer.
+ */
+void *
+drm_atomic_get_private_obj_state(struct drm_atomic_state *state, void *obj,
+			      const struct drm_private_state_funcs *funcs)
+{
+	int index, num_objs, i;
+	size_t size;
+	struct __drm_private_objs_state *arr;
+
+	for (i = 0; i < state->num_private_objs; i++)
+		if (obj == state->private_objs[i].obj &&
+		    state->private_objs[i].obj_state)
+			return state->private_objs[i].obj_state;
+
+	num_objs = state->num_private_objs + 1;
+	size = sizeof(*state->private_objs) * num_objs;
+	arr = krealloc(state->private_objs, size, GFP_KERNEL);
+	if (!arr)
+		return ERR_PTR(-ENOMEM);
+
+	state->private_objs = arr;
+	index = state->num_private_objs;
+	memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
+
+	state->private_objs[index].obj_state = funcs->duplicate_state(state, obj);
+	if (!state->private_objs[index].obj_state)
+		return ERR_PTR(-ENOMEM);
+
+	state->private_objs[index].obj = obj;
+	state->private_objs[index].funcs = funcs;
+	state->num_private_objs = num_objs;
+
+	DRM_DEBUG_ATOMIC("Added new private object state %p to %p\n",
+			 state->private_objs[index].obj_state, state);
+
+	return state->private_objs[index].obj_state;
+}
+EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
+
+/**
  * drm_atomic_get_connector_state - get connector state
  * @state: global atomic state object
  * @connector: connector to get state object for
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index c4538c5..d14094d 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2001,6 +2001,8 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	struct drm_crtc_commit *commit;
+	void *obj, *obj_state;
+	const struct drm_private_state_funcs *funcs;
 
 	if (stall) {
 		for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
@@ -2061,6 +2063,9 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 		state->planes[i].state = old_plane_state;
 		plane->state = new_plane_state;
 	}
+
+	__for_each_private_obj(state, obj, obj_state, i, funcs)
+		funcs->swap_state(obj, &state->private_objs[i].obj_state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
 
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index fd33ed5..54a9207 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -155,6 +155,53 @@ struct __drm_connnectors_state {
 };
 
 /**
+ * struct drm_private_state_funcs - atomic state functions for private objects
+ *
+ * These hooks are used by atomic helpers to create, swap and destroy states of
+ * private objects. The structure itself is used as a vtable to identify the
+ * associated private object type. Each private object type that needs to be
+ * added to the atomic states is expected to have an implementation of these
+ * hooks and pass a pointer to it's drm_private_state_funcs struct to
+ * drm_atomic_get_private_obj_state().
+ */
+struct drm_private_state_funcs {
+	/**
+	 * @duplicate_state:
+	 *
+	 * Duplicate the current state of the private object and return it. It
+	 * is an error to call this before obj->state has been initialized.
+	 *
+	 * RETURNS:
+	 *
+	 * Duplicated atomic state or NULL when obj->state is not
+	 * initialized or allocation failed.
+	 */
+	void *(*duplicate_state)(struct drm_atomic_state *state, void *obj);
+
+	/**
+	 * @swap_state:
+	 *
+	 * This function swaps the existing state of a private object @obj with
+	 * it's newly created state, the pointer to which is passed as
+	 * @obj_state_ptr.
+	 */
+	void (*swap_state)(void *obj, void **obj_state_ptr);
+
+	/**
+	 * @destroy_state:
+	 *
+	 * Frees the private object state created with @duplicate_state.
+	 */
+	void (*destroy_state)(void *obj_state);
+};
+
+struct __drm_private_objs_state {
+	void *obj;
+	void *obj_state;
+	const struct drm_private_state_funcs *funcs;
+};
+
+/**
  * struct drm_atomic_state - the global state object for atomic updates
  * @ref: count of all references to this state (will not be freed until zero)
  * @dev: parent DRM device
@@ -165,6 +212,8 @@ struct __drm_connnectors_state {
  * @crtcs: pointer to array of CRTC pointers
  * @num_connector: size of the @connectors and @connector_states arrays
  * @connectors: pointer to array of structures with per-connector data
+ * @num_private_objs: size of the @private_objs array
+ * @private_objs: pointer to array of private object pointers
  * @acquire_ctx: acquire context for this atomic modeset state update
  */
 struct drm_atomic_state {
@@ -178,6 +227,8 @@ struct drm_atomic_state {
 	struct __drm_crtcs_state *crtcs;
 	int num_connector;
 	struct __drm_connnectors_state *connectors;
+	int num_private_objs;
+	struct __drm_private_objs_state *private_objs;
 
 	struct drm_modeset_acquire_ctx *acquire_ctx;
 
@@ -270,6 +321,11 @@ int drm_atomic_connector_set_property(struct drm_connector *connector,
 		struct drm_connector_state *state, struct drm_property *property,
 		uint64_t val);
 
+void * __must_check
+drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
+			      void *obj,
+			      const struct drm_private_state_funcs *funcs);
+
 /**
  * drm_atomic_get_existing_crtc_state - get crtc state, if it exists
  * @state: global atomic state object
@@ -755,6 +811,42 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 		for_each_if (plane)
 
 /**
+ * __for_each_private_obj - iterate over all private objects
+ * @__state: the atomic state
+ *
+ * This macro iterates over the array containing private object data in atomic
+ * state
+ */
+#define __for_each_private_obj(__state, obj, obj_state, __i, __funcs)	\
+	for ((__i) = 0;							\
+	     (__i) < (__state)->num_private_objs &&			\
+	     ((obj) = (__state)->private_objs[__i].obj,			\
+	      (__funcs) = (__state)->private_objs[__i].funcs,		\
+	      (obj_state) = (__state)->private_objs[__i].obj_state,	\
+	      1);							\
+	     (__i)++)							\
+
+/**
+ * for_each_private_obj - iterate over a specify type of private object
+ * @__state: the atomic state
+ * @obj_funcs: function table to filter the private objects
+ *
+ * This macro iterates over the private objects state array while filtering the
+ * objects based on the vfunc table that is passed as @obj_funcs. New macros
+ * can be created by passing in the vfunc table associated with a specific
+ * private object.
+ */
+#define for_each_private_obj(__state, obj_funcs, obj, obj_state, __i, __funcs)	\
+	for ((__i) = 0;							\
+	     (__i) < (__state)->num_private_objs &&			\
+	     ((obj) = (__state)->private_objs[__i].obj,			\
+	      (__funcs) = (__state)->private_objs[__i].funcs,		\
+	      (obj_state) = (__state)->private_objs[__i].obj_state,	\
+	      1);							\
+	     (__i)++)							\
+		for_each_if (__funcs == obj_funcs)
+
+/**
  * drm_atomic_crtc_needs_modeset - compute combined modeset need
  * @state: &drm_crtc_state for the CRTC
  *
-- 
2.7.4

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Re: [PATCH v5 1/5] drm: Add driver-private objects to atomic state

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 10158 bytes --]

Hi Dhinakaran,

[auto build test WARNING on next-20170330]
[cannot apply to drm/drm-next drm-intel/for-linux-next v4.9-rc8 v4.9-rc7 v4.9-rc6 v4.11-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dhinakaran-Pandiyan/drm-Add-driver-private-objects-to-atomic-state/20170401-113603
reproduce: make htmldocs

All warnings (new ones prefixed by >>):

   WARNING: convert(1) not found, for SVG to PDF conversion install ImageMagick (https://www.imagemagick.org)
   include/linux/init.h:1: warning: no structured comments found
   kernel/sched/core.c:2088: warning: No description found for parameter 'rf'
   kernel/sched/core.c:2088: warning: Excess function parameter 'cookie' description in 'try_to_wake_up_local'
   include/linux/kthread.h:26: warning: Excess function parameter '...' description in 'kthread_create'
   kernel/sys.c:1: warning: no structured comments found
   include/linux/device.h:969: warning: No description found for parameter 'dma_ops'
   drivers/dma-buf/seqno-fence.c:1: warning: no structured comments found
   include/linux/iio/iio.h:597: warning: No description found for parameter 'trig_readonly'
   include/linux/iio/trigger.h:151: warning: No description found for parameter 'indio_dev'
   include/linux/iio/trigger.h:151: warning: No description found for parameter 'trig'
   include/linux/device.h:970: warning: No description found for parameter 'dma_ops'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'set_busid'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'irq_handler'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'irq_preinstall'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'irq_postinstall'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'irq_uninstall'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'debugfs_init'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_open_object'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_close_object'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'prime_handle_to_fd'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'prime_fd_to_handle'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_export'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_import'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_pin'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_unpin'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_res_obj'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_get_sg_table'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_import_sg_table'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_vmap'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_vunmap'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_prime_mmap'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'gem_vm_ops'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'major'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'minor'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'patchlevel'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'name'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'desc'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'date'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'driver_features'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'ioctls'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'num_ioctls'
   include/drm/drm_drv.h:524: warning: No description found for parameter 'fops'
>> include/drm/drm_atomic.h:829: warning: No description found for parameter 'obj'
>> include/drm/drm_atomic.h:829: warning: No description found for parameter 'obj_state'
>> include/drm/drm_atomic.h:829: warning: No description found for parameter '__i'
>> include/drm/drm_atomic.h:829: warning: No description found for parameter '__funcs'
   include/drm/drm_atomic.h:848: warning: No description found for parameter 'obj'
   include/drm/drm_atomic.h:848: warning: No description found for parameter 'obj_state'
   include/drm/drm_atomic.h:848: warning: No description found for parameter '__i'
   include/drm/drm_atomic.h:848: warning: No description found for parameter '__funcs'
   include/drm/drm_color_mgmt.h:1: warning: no structured comments found
   drivers/gpu/drm/drm_plane_helper.c:403: warning: No description found for parameter 'ctx'
   drivers/gpu/drm/drm_plane_helper.c:404: warning: No description found for parameter 'ctx'
   drivers/gpu/drm/i915/intel_lpe_audio.c:342: warning: No description found for parameter 'pipe'
   drivers/gpu/drm/i915/intel_lpe_audio.c:342: warning: No description found for parameter 'dp_output'
   drivers/gpu/drm/i915/intel_lpe_audio.c:342: warning: No description found for parameter 'link_rate'
   drivers/gpu/drm/i915/intel_lpe_audio.c:343: warning: No description found for parameter 'pipe'
   drivers/gpu/drm/i915/intel_lpe_audio.c:343: warning: No description found for parameter 'dp_output'
   drivers/gpu/drm/i915/intel_lpe_audio.c:343: warning: No description found for parameter 'link_rate'
   drivers/media/dvb-core/dvb_frontend.h:677: warning: No description found for parameter 'refcount'
   include/media/tveeprom.h:104: warning: Excess function parameter 'c' description in 'tveeprom_hauppauge_analog'
   Documentation/core-api/assoc_array.rst:13: WARNING: Enumerated list ends without a blank line; unexpected unindent.
   Documentation/doc-guide/sphinx.rst:126: ERROR: Unknown target name: "sphinx c domain".
   kernel/sched/fair.c:7657: WARNING: Inline emphasis start-string without end-string.
   kernel/time/timer.c:1200: ERROR: Unexpected indentation.
   kernel/time/timer.c:1202: ERROR: Unexpected indentation.
   kernel/time/timer.c:1203: WARNING: Block quote ends without a blank line; unexpected unindent.
   include/linux/wait.h:122: WARNING: Block quote ends without a blank line; unexpected unindent.
   include/linux/wait.h:125: ERROR: Unexpected indentation.
   include/linux/wait.h:127: WARNING: Block quote ends without a blank line; unexpected unindent.
   kernel/time/hrtimer.c:990: WARNING: Block quote ends without a blank line; unexpected unindent.
   kernel/signal.c:322: WARNING: Inline literal start-string without end-string.
   include/linux/iio/iio.h:219: ERROR: Unexpected indentation.
   include/linux/iio/iio.h:220: WARNING: Block quote ends without a blank line; unexpected unindent.
   include/linux/iio/iio.h:226: WARNING: Definition list ends without a blank line; unexpected unindent.
   drivers/iio/industrialio-core.c:639: ERROR: Unknown target name: "iio_val".
   drivers/iio/industrialio-core.c:646: ERROR: Unknown target name: "iio_val".
   drivers/message/fusion/mptbase.c:5051: WARNING: Definition list ends without a blank line; unexpected unindent.
   drivers/tty/serial/serial_core.c:1898: WARNING: Definition list ends without a blank line; unexpected unindent.
   include/linux/regulator/driver.h:271: ERROR: Unknown target name: "regulator_regmap_x_voltage".
   include/linux/spi/spi.h:370: ERROR: Unexpected indentation.
   drivers/usb/core/message.c:478: ERROR: Unexpected indentation.
   drivers/usb/core/message.c:479: WARNING: Block quote ends without a blank line; unexpected unindent.
   Documentation/driver-api/usb.rst:623: ERROR: Unknown target name: "usb_type".
   Documentation/driver-api/usb.rst:623: ERROR: Unknown target name: "usb_dir".
   Documentation/driver-api/usb.rst:623: ERROR: Unknown target name: "usb_recip".
   Documentation/driver-api/usb.rst:689: ERROR: Unknown target name: "usbdevfs_urb_type".
   drivers/gpu/drm/drm_scdc_helper.c:203: ERROR: Unexpected indentation.
   drivers/gpu/drm/drm_scdc_helper.c:204: WARNING: Block quote ends without a blank line; unexpected unindent.
   Documentation/gpu/todo.rst:111: ERROR: Unknown target name: "drm_fb".
   sound/soc/soc-core.c:2665: ERROR: Unknown target name: "snd_soc_daifmt".
   sound/core/jack.c:312: ERROR: Unknown target name: "snd_jack_btn".
   Documentation/usb/typec.rst:116: ERROR: Error in "kernel-doc" directive:
   invalid option block.

vim +/obj +829 include/drm/drm_atomic.h

   813	/**
   814	 * __for_each_private_obj - iterate over all private objects
   815	 * @__state: the atomic state
   816	 *
   817	 * This macro iterates over the array containing private object data in atomic
   818	 * state
   819	 */
   820	#define __for_each_private_obj(__state, obj, obj_state, __i, __funcs)	\
   821		for ((__i) = 0;							\
   822		     (__i) < (__state)->num_private_objs &&			\
   823		     ((obj) = (__state)->private_objs[__i].obj,			\
   824		      (__funcs) = (__state)->private_objs[__i].funcs,		\
   825		      (obj_state) = (__state)->private_objs[__i].obj_state,	\
   826		      1);							\
   827		     (__i)++)							\
   828	
 > 829	/**
   830	 * for_each_private_obj - iterate over a specify type of private object
   831	 * @__state: the atomic state
   832	 * @obj_funcs: function table to filter the private objects
   833	 *
   834	 * This macro iterates over the private objects state array while filtering the
   835	 * objects based on the vfunc table that is passed as @obj_funcs. New macros
   836	 * can be created by passing in the vfunc table associated with a specific
   837	 * private object.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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[PATCH v5 2/5] drm/dp: Introduce MST topology state to track available link bandwidth

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

Link bandwidth is shared between multiple display streams in DP MST
configurations. The DP MST topology manager structure maintains the
shared link bandwidth for a primary link directly connected to the GPU. For
atomic modesetting drivers, checking if there is sufficient link bandwidth
for a mode needs to be done during the atomic_check phase to avoid failed
modesets. Let's encapsulate the available link bw information in a
private state structure so that bw can be allocated and released atomically
for each of the ports sharing the primary link.

v3: WARN_ON() if connection_mutex is not held (Archit)
v2: Included kernel doc, moved state initialization and switched to
kmemdup() for allocation (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 75 +++++++++++++++++++++++++++++++++++
 include/drm/drm_dp_mst_helper.h       | 20 ++++++++++
 2 files changed, 95 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index d3fc7e4..0ad0baa 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2936,6 +2936,69 @@ static void drm_dp_destroy_connector_work(struct work_struct *work)
 		(*mgr->cbs->hotplug)(mgr);
 }
 
+void *drm_dp_mst_duplicate_state(struct drm_atomic_state *state, void *obj)
+{
+	struct drm_dp_mst_topology_mgr *mgr = obj;
+	struct drm_dp_mst_topology_state *new_mst_state;
+
+	if (WARN_ON(!mgr->state))
+		return NULL;
+
+	new_mst_state = kmemdup(mgr->state, sizeof(*new_mst_state), GFP_KERNEL);
+	if (new_mst_state)
+		new_mst_state->state = state;
+	return new_mst_state;
+}
+
+void drm_dp_mst_swap_state(void *obj, void **obj_state_ptr)
+{
+	struct drm_dp_mst_topology_mgr *mgr = obj;
+	struct drm_dp_mst_topology_state **topology_state_ptr;
+
+	topology_state_ptr = (struct drm_dp_mst_topology_state **)obj_state_ptr;
+
+	mgr->state->state = (*topology_state_ptr)->state;
+	swap(*topology_state_ptr, mgr->state);
+	mgr->state->state = NULL;
+}
+
+void drm_dp_mst_destroy_state(void *obj_state)
+{
+	kfree(obj_state);
+}
+
+static const struct drm_private_state_funcs mst_state_funcs = {
+	.duplicate_state = drm_dp_mst_duplicate_state,
+	.swap_state = drm_dp_mst_swap_state,
+	.destroy_state = drm_dp_mst_destroy_state,
+};
+
+/**
+ * drm_atomic_get_mst_topology_state: get MST topology state
+ *
+ * @state: global atomic state
+ * @mgr: MST topology manager, also the private object in this case
+ *
+ * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
+ * state vtable so that the private object state returned is that of a MST
+ * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
+ * to care of the locking, so warn if don't hold the connection_mutex.
+ *
+ * RETURNS:
+ *
+ * The MST topology state or error pointer.
+ */
+struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
+								    struct drm_dp_mst_topology_mgr *mgr)
+{
+	struct drm_device *dev = mgr->dev;
+
+	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
+	return drm_atomic_get_private_obj_state(state, mgr,
+						&mst_state_funcs);
+}
+EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
+
 /**
  * drm_dp_mst_topology_mgr_init - initialise a topology manager
  * @mgr: manager struct to initialise
@@ -2980,6 +3043,15 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
 	if (test_calc_pbn_mode() < 0)
 		DRM_ERROR("MST PBN self-test failed\n");
 
+	mgr->state = kzalloc(sizeof(*mgr->state), GFP_KERNEL);
+	if (mgr->state == NULL)
+		return -ENOMEM;
+	mgr->state->mgr = mgr;
+
+	/* max. time slots - one slot for MTP header */
+	mgr->state->avail_slots = 63;
+	mgr->funcs = &mst_state_funcs;
+
 	return 0;
 }
 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
@@ -3000,6 +3072,9 @@ void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
 	mutex_unlock(&mgr->payload_lock);
 	mgr->dev = NULL;
 	mgr->aux = NULL;
+	kfree(mgr->state);
+	mgr->state = NULL;
+	mgr->funcs = NULL;
 }
 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
 
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index 5b02476..0b371df 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -24,6 +24,7 @@
 
 #include <linux/types.h>
 #include <drm/drm_dp_helper.h>
+#include <drm/drm_atomic.h>
 
 struct drm_dp_mst_branch;
 
@@ -403,6 +404,12 @@ struct drm_dp_payload {
 	int vcpi;
 };
 
+struct drm_dp_mst_topology_state {
+	int avail_slots;
+	struct drm_atomic_state *state;
+	struct drm_dp_mst_topology_mgr *mgr;
+};
+
 /**
  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
  *
@@ -481,6 +488,16 @@ struct drm_dp_mst_topology_mgr {
 	int pbn_div;
 
 	/**
+	 * @state: State information for topology manager
+	 */
+	struct drm_dp_mst_topology_state *state;
+
+	/**
+	 * @funcs: Atomic helper callbacks
+	 */
+	const struct drm_private_state_funcs *funcs;
+
+	/**
 	 * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
 	 * &drm_dp_sideband_msg_tx.state once they are queued
 	 */
@@ -596,4 +613,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 
 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
+struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
+								    struct drm_dp_mst_topology_mgr *mgr);
+
 #endif
-- 
2.7.4

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[PATCH v5 3/5] drm/dp: Add DP MST helpers to atomically find and release vcpi slots

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

drm_dp_atomic_find_vcpi_slots() should be called from ->atomic_check() to
check there are sufficient vcpi slots for a mode and to add that to the
state. This should be followed by a call to drm_dp_mst_allocate_vcpi()
in ->atomic_commit() to initialize a struct vcpi for the port.

drm_dp_atomic_release_vcpi_slots() should be called from
->atomic_check() to release a port's vcpi slot allocation from the
state.

Drivers that do not make use of this atomic helper are expected to call
drm_dp_find_vcpi_slots() instead before calling
drm_dp_mst_allocate_vcpi().

v2:
Added checks for verifying the port reference is valid
Moved get_mst_topology_state() into the helpers (Daniel)
Changed find_vcpi_slots() to not depend on current allocation

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 75 +++++++++++++++++++++++++++++++++++
 include/drm/drm_dp_mst_helper.h       |  6 +++
 2 files changed, 81 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 0ad0baa..9f3954e 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2498,6 +2498,81 @@ static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
 }
 
 /**
+ * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
+ * @state: global atomic state
+ * @mgr: MST topology manager for the port
+ * @port: port to find vcpi slots for
+ * @pbn: bandwidth required for the mode in PBN
+ *
+ * RETURNS:
+ * Total slots in the atomic state assigned for this port or error
+ */
+int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
+				  struct drm_dp_mst_topology_mgr *mgr,
+				  struct drm_dp_mst_port *port, int pbn)
+{
+	struct drm_dp_mst_topology_state *topology_state;
+	int req_slots;
+
+	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
+	if (topology_state == NULL)
+		return -ENOMEM;
+
+	port = drm_dp_get_validated_port_ref(mgr, port);
+	if (port == NULL)
+		return -EINVAL;
+	req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
+	DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
+			req_slots, topology_state->avail_slots);
+
+	if (req_slots > topology_state->avail_slots) {
+		drm_dp_put_port(port);
+		return -ENOSPC;
+	}
+
+	topology_state->avail_slots -= req_slots;
+	DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
+
+	drm_dp_put_port(port);
+	return req_slots;
+}
+EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
+
+/**
+ * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
+ * @state: global atomic state
+ * @mgr: MST topology manager for the port
+ * @port: port to release the vcpi slots for
+ *
+ * RETURNS:
+ * Number of slots released from the atomic state for this port
+ */
+int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
+				     struct drm_dp_mst_topology_mgr *mgr,
+				     struct drm_dp_mst_port *port)
+{
+	struct drm_dp_mst_topology_state *topology_state;
+	int curr_slots;
+
+	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
+	if (topology_state == NULL)
+		return -ENOMEM;
+
+	port = drm_dp_get_validated_port_ref(mgr, port);
+	if (port == NULL)
+		return -EINVAL;
+
+	curr_slots = port->vcpi.num_slots;
+	topology_state->avail_slots += curr_slots;
+	DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
+			curr_slots, topology_state->avail_slots);
+
+	drm_dp_put_port(port);
+	return curr_slots;
+}
+EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
+
+/**
  * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
  * @mgr: manager for this port
  * @port: port to allocate a virtual channel for.
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index 0b371df..64e7dac 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -615,5 +615,11 @@ void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
 								    struct drm_dp_mst_topology_mgr *mgr);
+int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
+				  struct drm_dp_mst_topology_mgr *mgr,
+				  struct drm_dp_mst_port *port, int pbn);
+int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
+				     struct drm_dp_mst_topology_mgr *mgr,
+				     struct drm_dp_mst_port *port);
 
 #endif
-- 
2.7.4

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Re: [PATCH v5 3/5] drm/dp: Add DP MST helpers to atomically find and release vcpi slots

[Pandiyan, Dhinakaran]

On Thu, 2017-03-30 at 01:42 -0700, Dhinakaran Pandiyan wrote:
> From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>
> 
> drm_dp_atomic_find_vcpi_slots() should be called from ->atomic_check() to
> check there are sufficient vcpi slots for a mode and to add that to the
> state. This should be followed by a call to drm_dp_mst_allocate_vcpi()
> in ->atomic_commit() to initialize a struct vcpi for the port.
> 
> drm_dp_atomic_release_vcpi_slots() should be called from
> ->atomic_check() to release a port's vcpi slot allocation from the
> state.
> 
> Drivers that do not make use of this atomic helper are expected to call
> drm_dp_find_vcpi_slots() instead before calling
> drm_dp_mst_allocate_vcpi().
> 
> v2:
> Added checks for verifying the port reference is valid
> Moved get_mst_topology_state() into the helpers (Daniel)
> Changed find_vcpi_slots() to not depend on current allocation
> 
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Archit Taneja <architt@codeaurora.org>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Harry Wentland <Harry.wentland@amd.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 75 +++++++++++++++++++++++++++++++++++
>  include/drm/drm_dp_mst_helper.h       |  6 +++
>  2 files changed, 81 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 0ad0baa..9f3954e 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2498,6 +2498,81 @@ static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
>  }
>  
>  /**
> + * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
> + * @state: global atomic state
> + * @mgr: MST topology manager for the port
> + * @port: port to find vcpi slots for
> + * @pbn: bandwidth required for the mode in PBN
> + *
> + * RETURNS:
> + * Total slots in the atomic state assigned for this port or error
> + */
> +int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
> +				  struct drm_dp_mst_topology_mgr *mgr,
> +				  struct drm_dp_mst_port *port, int pbn)
> +{
> +	struct drm_dp_mst_topology_state *topology_state;
> +	int req_slots;
> +
> +	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
> +	if (topology_state == NULL)
> +		return -ENOMEM;
> +
> +	port = drm_dp_get_validated_port_ref(mgr, port);
> +	if (port == NULL)
> +		return -EINVAL;
> +	req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
> +	DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
> +			req_slots, topology_state->avail_slots);
> +
> +	if (req_slots > topology_state->avail_slots) {
> +		drm_dp_put_port(port);
> +		return -ENOSPC;
> +	}
> +
> +	topology_state->avail_slots -= req_slots;
> +	DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
> +
> +	drm_dp_put_port(port);
> +	return req_slots;
> +}
> +EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
> +
> +/**
> + * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
> + * @state: global atomic state
> + * @mgr: MST topology manager for the port
> + * @port: port to release the vcpi slots for
> + *
> + * RETURNS:
> + * Number of slots released from the atomic state for this port
> + */
> +int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
> +				     struct drm_dp_mst_topology_mgr *mgr,
> +				     struct drm_dp_mst_port *port)
> +{
> +	struct drm_dp_mst_topology_state *topology_state;
> +	int curr_slots;
> +
> +	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
> +	if (topology_state == NULL)
> +		return -ENOMEM;
> +
> +	port = drm_dp_get_validated_port_ref(mgr, port);
> +	if (port == NULL)
> +		return -EINVAL;
> +
> +	curr_slots = port->vcpi.num_slots;

This is a problem if the port has been destroyed.

> +	topology_state->avail_slots += curr_slots;
> +	DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
> +			curr_slots, topology_state->avail_slots);
> +
> +	drm_dp_put_port(port);
> +	return curr_slots;
> +}

Should we do this instead?

int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
                                    struct drm_dp_mst_topology_mgr *mgr,
                                    struct drm_dp_mst_port *port, int
slots)
{
       struct drm_dp_mst_topology_state *topology_state;

       topology_state = drm_atomic_get_mst_topology_state(state, mgr);
       if (topology_state == NULL)
               return -ENOMEM;

       /* We cannot rely on port->vcpi.num_slots to update
        * topology_state->avail_slots as the port may not exist if the
parent
        * branch device was unplugged. This should be fixed by tracking
        * per-port slot allocation in drm_dp_mst_topology_state instead
of
        * depending on the caller to tell us how many slots to release.
        */
       topology_state->avail_slots += slots;
       DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
                       slots, topology_state->avail_slots);

       return 0;
}



> +EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
> +
> +/**
>   * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
>   * @mgr: manager for this port
>   * @port: port to allocate a virtual channel for.
> diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
> index 0b371df..64e7dac 100644
> --- a/include/drm/drm_dp_mst_helper.h
> +++ b/include/drm/drm_dp_mst_helper.h
> @@ -615,5 +615,11 @@ void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
>  int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
>  struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
>  								    struct drm_dp_mst_topology_mgr *mgr);
> +int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
> +				  struct drm_dp_mst_topology_mgr *mgr,
> +				  struct drm_dp_mst_port *port, int pbn);
> +int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
> +				     struct drm_dp_mst_topology_mgr *mgr,
> +				     struct drm_dp_mst_port *port);
>  
>  #endif

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[PATCH v5 4/5] drm: Connector helper function to release resources

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

Having an ->atomic_release callback is useful to release shared resources
that get allocated in compute_config(). This function is expected to be
called in the atomic_check() phase before new resources are acquired.

v4: Document that the function is conditionally called and before
other atomic_checks() (Daniel)
v3: Use the new 'for_each_oldnew_connector_in_state()' macro.
v2: Moved the caller hunk to this patch (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_atomic_helper.c      | 19 +++++++++++++++++++
 include/drm/drm_modeset_helper_vtables.h | 16 ++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index d14094d..9d07669 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -586,6 +586,25 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
 		}
 	}
 
+	for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
+		const struct drm_connector_helper_funcs *conn_funcs;
+		struct drm_crtc_state *crtc_state;
+
+		conn_funcs = connector->helper_private;
+		if (!conn_funcs->atomic_release)
+			continue;
+
+		if (!old_connector_state->crtc)
+			continue;
+
+		crtc_state = drm_atomic_get_existing_crtc_state(state, old_connector_state->crtc);
+
+		if (crtc_state->connectors_changed ||
+		    crtc_state->mode_changed ||
+		    (crtc_state->active_changed && !crtc_state->active))
+			conn_funcs->atomic_release(connector, new_connector_state);
+	}
+
 	return mode_fixup(state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
index 091c422..84e80aa 100644
--- a/include/drm/drm_modeset_helper_vtables.h
+++ b/include/drm/drm_modeset_helper_vtables.h
@@ -836,6 +836,22 @@ struct drm_connector_helper_funcs {
 	 */
 	struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector,
 						   struct drm_connector_state *connector_state);
+
+	/**
+	 * @atomic_release:
+	 *
+	 * This function is conditionally called to release shared resources
+	 * when the attached CRTC's mode changes or it's connectors change or
+	 * becomes inactive. It is called before the corresponding
+	 * &drm_crtc_helper_funcs.atomic_check or
+	 * &drm_crtc_helper_funcs.mode_fixup hooks are called.
+	 *
+	 * NOTE:
+	 *
+	 * This function is called in the check phase of an atomic update.
+	 */
+	void (*atomic_release)(struct drm_connector *connector,
+			       struct drm_connector_state *connector_state);
 };
 
 /**
-- 
2.7.4

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Re: [PATCH v5 4/5] drm: Connector helper function to release resources

[Maarten Lankhorst]

Op 30-03-17 om 10:42 schreef Dhinakaran Pandiyan:
> From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>
>
> Having an ->atomic_release callback is useful to release shared resources
> that get allocated in compute_config(). This function is expected to be
> called in the atomic_check() phase before new resources are acquired.
>
> v4: Document that the function is conditionally called and before
> other atomic_checks() (Daniel)
> v3: Use the new 'for_each_oldnew_connector_in_state()' macro.
> v2: Moved the caller hunk to this patch (Daniel)
>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Archit Taneja <architt@codeaurora.org>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Harry Wentland <Harry.wentland@amd.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> ---
>  drivers/gpu/drm/drm_atomic_helper.c      | 19 +++++++++++++++++++
>  include/drm/drm_modeset_helper_vtables.h | 16 ++++++++++++++++
>  2 files changed, 35 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index d14094d..9d07669 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -586,6 +586,25 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
>  		}
>  	}
>  
> +	for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
> +		const struct drm_connector_helper_funcs *conn_funcs;
> +		struct drm_crtc_state *crtc_state;
> +
> +		conn_funcs = connector->helper_private;
> +		if (!conn_funcs->atomic_release)
> +			continue;
> +
> +		if (!old_connector_state->crtc)
> +			continue;
> +
> +		crtc_state = drm_atomic_get_existing_crtc_state(state, old_connector_state->crtc);
> +
> +		if (crtc_state->connectors_changed ||
> +		    crtc_state->mode_changed ||
> +		    (crtc_state->active_changed && !crtc_state->active))
> +			conn_funcs->atomic_release(connector, new_connector_state);
> +	}
> +
>  	return mode_fixup(state);
>  }
Oops, I'm just looking at patch 5 again..

atomic_release should return an int to allow error propogation. There's no good reason why it shouldn't.
This would allow handling errors in patch 5 more gracefully.
>  EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
> diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> index 091c422..84e80aa 100644
> --- a/include/drm/drm_modeset_helper_vtables.h
> +++ b/include/drm/drm_modeset_helper_vtables.h
> @@ -836,6 +836,22 @@ struct drm_connector_helper_funcs {
>  	 */
>  	struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector,
>  						   struct drm_connector_state *connector_state);
> +
> +	/**
> +	 * @atomic_release:
> +	 *
> +	 * This function is conditionally called to release shared resources
> +	 * when the attached CRTC's mode changes or it's connectors change or
> +	 * becomes inactive. It is called before the corresponding
> +	 * &drm_crtc_helper_funcs.atomic_check or
> +	 * &drm_crtc_helper_funcs.mode_fixup hooks are called.
> +	 *
> +	 * NOTE:
> +	 *
> +	 * This function is called in the check phase of an atomic update.
> +	 */
> +	void (*atomic_release)(struct drm_connector *connector,
> +			       struct drm_connector_state *connector_state);
>  };
>  
>  /**


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Re: [PATCH v5 4/5] drm: Connector helper function to release resources

[Pandiyan, Dhinakaran]

On Thu, 2017-03-30 at 12:36 +0200, Maarten Lankhorst wrote:
> Op 30-03-17 om 10:42 schreef Dhinakaran Pandiyan:
> > From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>
> >
> > Having an ->atomic_release callback is useful to release shared resources
> > that get allocated in compute_config(). This function is expected to be
> > called in the atomic_check() phase before new resources are acquired.
> >
> > v4: Document that the function is conditionally called and before
> > other atomic_checks() (Daniel)
> > v3: Use the new 'for_each_oldnew_connector_in_state()' macro.
> > v2: Moved the caller hunk to this patch (Daniel)
> >
> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > Cc: Archit Taneja <architt@codeaurora.org>
> > Cc: Chris Wilson <chris@chris-wilson.co.uk>
> > Cc: Harry Wentland <Harry.wentland@amd.com>
> > Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> > ---
> >  drivers/gpu/drm/drm_atomic_helper.c      | 19 +++++++++++++++++++
> >  include/drm/drm_modeset_helper_vtables.h | 16 ++++++++++++++++
> >  2 files changed, 35 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> > index d14094d..9d07669 100644
> > --- a/drivers/gpu/drm/drm_atomic_helper.c
> > +++ b/drivers/gpu/drm/drm_atomic_helper.c
> > @@ -586,6 +586,25 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> >  		}
> >  	}
> >  
> > +	for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
> > +		const struct drm_connector_helper_funcs *conn_funcs;
> > +		struct drm_crtc_state *crtc_state;
> > +
> > +		conn_funcs = connector->helper_private;
> > +		if (!conn_funcs->atomic_release)
> > +			continue;
> > +
> > +		if (!old_connector_state->crtc)
> > +			continue;
> > +
> > +		crtc_state = drm_atomic_get_existing_crtc_state(state, old_connector_state->crtc);
> > +
> > +		if (crtc_state->connectors_changed ||
> > +		    crtc_state->mode_changed ||
> > +		    (crtc_state->active_changed && !crtc_state->active))
> > +			conn_funcs->atomic_release(connector, new_connector_state);
> > +	}
> > +
> >  	return mode_fixup(state);
> >  }
> Oops, I'm just looking at patch 5 again..
> 
> atomic_release should return an int to allow error propogation. There's no good reason why it shouldn't.
> This would allow handling errors in patch 5 more gracefully.

Makes sense, will change that. This made me think about how
intel_dp_mst_atomic_release() handles an invalid mst_port reference
i.e., in case the port is gone. I'll fix both and send a new version.

-DK


> >  EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
> > diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> > index 091c422..84e80aa 100644
> > --- a/include/drm/drm_modeset_helper_vtables.h
> > +++ b/include/drm/drm_modeset_helper_vtables.h
> > @@ -836,6 +836,22 @@ struct drm_connector_helper_funcs {
> >  	 */
> >  	struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector,
> >  						   struct drm_connector_state *connector_state);
> > +
> > +	/**
> > +	 * @atomic_release:
> > +	 *
> > +	 * This function is conditionally called to release shared resources
> > +	 * when the attached CRTC's mode changes or it's connectors change or
> > +	 * becomes inactive. It is called before the corresponding
> > +	 * &drm_crtc_helper_funcs.atomic_check or
> > +	 * &drm_crtc_helper_funcs.mode_fixup hooks are called.
> > +	 *
> > +	 * NOTE:
> > +	 *
> > +	 * This function is called in the check phase of an atomic update.
> > +	 */
> > +	void (*atomic_release)(struct drm_connector *connector,
> > +			       struct drm_connector_state *connector_state);
> >  };
> >  
> >  /**
> 
> 
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[PATCH v6 1/5] drm: Add driver-private objects to atomic state

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

It is necessary to track states for objects other than connector, crtc
and plane for atomic modesets. But adding objects like DP MST link
bandwidth to drm_atomic_state would mean that a non-core object will be
modified by the core helper functions for swapping and clearing
it's state. So, lets add void * objects and helper functions that operate
on void * types to keep these objects and states private to the core.
Drivers can then implement specific functions to swap and clear states.
The other advantage having just void * for these objects in
drm_atomic_state is that objects of different types can be managed in the
same state array.

v6: More kernel-doc to keep 0-day happy
v5: Remove more NULL checks (Maarten)
v4: Avoid redundant NULL checks when private_objs array is empty (Maarten)
v3: Macro alignment (Chris)
v2: Added docs and new iterator to filter private objects (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>

Acked-by: Harry Wentland <harry.wentland@amd.com>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_atomic.c        |  65 +++++++++++++++++++++++
 drivers/gpu/drm/drm_atomic_helper.c |   5 ++
 include/drm/drm_atomic.h            | 101 ++++++++++++++++++++++++++++++++++++
 3 files changed, 171 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 9b892af..4d37019 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -57,6 +57,7 @@ void drm_atomic_state_default_release(struct drm_atomic_state *state)
 	kfree(state->connectors);
 	kfree(state->crtcs);
 	kfree(state->planes);
+	kfree(state->private_objs);
 }
 EXPORT_SYMBOL(drm_atomic_state_default_release);
 
@@ -184,6 +185,17 @@ void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 		state->planes[i].ptr = NULL;
 		state->planes[i].state = NULL;
 	}
+
+	for (i = 0; i < state->num_private_objs; i++) {
+		void *obj_state = state->private_objs[i].obj_state;
+
+		state->private_objs[i].funcs->destroy_state(obj_state);
+		state->private_objs[i].obj = NULL;
+		state->private_objs[i].obj_state = NULL;
+		state->private_objs[i].funcs = NULL;
+	}
+	state->num_private_objs = 0;
+
 }
 EXPORT_SYMBOL(drm_atomic_state_default_clear);
 
@@ -978,6 +990,59 @@ static void drm_atomic_plane_print_state(struct drm_printer *p,
 }
 
 /**
+ * drm_atomic_get_private_obj_state - get private object state
+ * @state: global atomic state
+ * @obj: private object to get the state for
+ * @funcs: pointer to the struct of function pointers that identify the object
+ * type
+ *
+ * This function returns the private object state for the given private object,
+ * allocating the state if needed. It does not grab any locks as the caller is
+ * expected to care of any required locking.
+ *
+ * RETURNS:
+ *
+ * Either the allocated state or the error code encoded into a pointer.
+ */
+void *
+drm_atomic_get_private_obj_state(struct drm_atomic_state *state, void *obj,
+			      const struct drm_private_state_funcs *funcs)
+{
+	int index, num_objs, i;
+	size_t size;
+	struct __drm_private_objs_state *arr;
+
+	for (i = 0; i < state->num_private_objs; i++)
+		if (obj == state->private_objs[i].obj &&
+		    state->private_objs[i].obj_state)
+			return state->private_objs[i].obj_state;
+
+	num_objs = state->num_private_objs + 1;
+	size = sizeof(*state->private_objs) * num_objs;
+	arr = krealloc(state->private_objs, size, GFP_KERNEL);
+	if (!arr)
+		return ERR_PTR(-ENOMEM);
+
+	state->private_objs = arr;
+	index = state->num_private_objs;
+	memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
+
+	state->private_objs[index].obj_state = funcs->duplicate_state(state, obj);
+	if (!state->private_objs[index].obj_state)
+		return ERR_PTR(-ENOMEM);
+
+	state->private_objs[index].obj = obj;
+	state->private_objs[index].funcs = funcs;
+	state->num_private_objs = num_objs;
+
+	DRM_DEBUG_ATOMIC("Added new private object state %p to %p\n",
+			 state->private_objs[index].obj_state, state);
+
+	return state->private_objs[index].obj_state;
+}
+EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
+
+/**
  * drm_atomic_get_connector_state - get connector state
  * @state: global atomic state object
  * @connector: connector to get state object for
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index c4538c5..d14094d 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2001,6 +2001,8 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	struct drm_crtc_commit *commit;
+	void *obj, *obj_state;
+	const struct drm_private_state_funcs *funcs;
 
 	if (stall) {
 		for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
@@ -2061,6 +2063,9 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 		state->planes[i].state = old_plane_state;
 		plane->state = new_plane_state;
 	}
+
+	__for_each_private_obj(state, obj, obj_state, i, funcs)
+		funcs->swap_state(obj, &state->private_objs[i].obj_state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
 
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index fd33ed5..80da31c 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -155,6 +155,53 @@ struct __drm_connnectors_state {
 };
 
 /**
+ * struct drm_private_state_funcs - atomic state functions for private objects
+ *
+ * These hooks are used by atomic helpers to create, swap and destroy states of
+ * private objects. The structure itself is used as a vtable to identify the
+ * associated private object type. Each private object type that needs to be
+ * added to the atomic states is expected to have an implementation of these
+ * hooks and pass a pointer to it's drm_private_state_funcs struct to
+ * drm_atomic_get_private_obj_state().
+ */
+struct drm_private_state_funcs {
+	/**
+	 * @duplicate_state:
+	 *
+	 * Duplicate the current state of the private object and return it. It
+	 * is an error to call this before obj->state has been initialized.
+	 *
+	 * RETURNS:
+	 *
+	 * Duplicated atomic state or NULL when obj->state is not
+	 * initialized or allocation failed.
+	 */
+	void *(*duplicate_state)(struct drm_atomic_state *state, void *obj);
+
+	/**
+	 * @swap_state:
+	 *
+	 * This function swaps the existing state of a private object @obj with
+	 * it's newly created state, the pointer to which is passed as
+	 * @obj_state_ptr.
+	 */
+	void (*swap_state)(void *obj, void **obj_state_ptr);
+
+	/**
+	 * @destroy_state:
+	 *
+	 * Frees the private object state created with @duplicate_state.
+	 */
+	void (*destroy_state)(void *obj_state);
+};
+
+struct __drm_private_objs_state {
+	void *obj;
+	void *obj_state;
+	const struct drm_private_state_funcs *funcs;
+};
+
+/**
  * struct drm_atomic_state - the global state object for atomic updates
  * @ref: count of all references to this state (will not be freed until zero)
  * @dev: parent DRM device
@@ -165,6 +212,8 @@ struct __drm_connnectors_state {
  * @crtcs: pointer to array of CRTC pointers
  * @num_connector: size of the @connectors and @connector_states arrays
  * @connectors: pointer to array of structures with per-connector data
+ * @num_private_objs: size of the @private_objs array
+ * @private_objs: pointer to array of private object pointers
  * @acquire_ctx: acquire context for this atomic modeset state update
  */
 struct drm_atomic_state {
@@ -178,6 +227,8 @@ struct drm_atomic_state {
 	struct __drm_crtcs_state *crtcs;
 	int num_connector;
 	struct __drm_connnectors_state *connectors;
+	int num_private_objs;
+	struct __drm_private_objs_state *private_objs;
 
 	struct drm_modeset_acquire_ctx *acquire_ctx;
 
@@ -270,6 +321,11 @@ int drm_atomic_connector_set_property(struct drm_connector *connector,
 		struct drm_connector_state *state, struct drm_property *property,
 		uint64_t val);
 
+void * __must_check
+drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
+			      void *obj,
+			      const struct drm_private_state_funcs *funcs);
+
 /**
  * drm_atomic_get_existing_crtc_state - get crtc state, if it exists
  * @state: global atomic state object
@@ -755,6 +811,51 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 		for_each_if (plane)
 
 /**
+ * __for_each_private_obj - iterate over all private objects
+ * @__state: &struct drm_atomic_state pointer
+ * @obj: private object iteration cursor
+ * @obj_state: private object state iteration cursor
+ * @__i: int iteration cursor, for macro-internal use
+ * @__funcs: &struct drm_private_state_funcs iteration cursor
+ *
+ * This macro iterates over the array containing private object data in atomic
+ * state
+ */
+#define __for_each_private_obj(__state, obj, obj_state, __i, __funcs)	\
+	for ((__i) = 0;							\
+	     (__i) < (__state)->num_private_objs &&			\
+	     ((obj) = (__state)->private_objs[__i].obj,			\
+	      (__funcs) = (__state)->private_objs[__i].funcs,		\
+	      (obj_state) = (__state)->private_objs[__i].obj_state,	\
+	      1);							\
+	     (__i)++)							\
+
+/**
+ * for_each_private_obj - iterate over a specify type of private object
+ * @__state: &struct drm_atomic_state pointer
+ * @obj_funcs: &struct drm_private_state_funcs function table to filter
+ * 	private objects
+ * @obj: private object iteration cursor
+ * @obj_state: private object state iteration cursor
+ * @__i: int iteration cursor, for macro-internal use
+ * @__funcs: &struct drm_private_state_funcs iteration cursor
+ *
+ * This macro iterates over the private objects state array while filtering the
+ * objects based on the vfunc table that is passed as @obj_funcs. New macros
+ * can be created by passing in the vfunc table associated with a specific
+ * private object.
+ */
+#define for_each_private_obj(__state, obj_funcs, obj, obj_state, __i, __funcs)	\
+	for ((__i) = 0;							\
+	     (__i) < (__state)->num_private_objs &&			\
+	     ((obj) = (__state)->private_objs[__i].obj,			\
+	      (__funcs) = (__state)->private_objs[__i].funcs,		\
+	      (obj_state) = (__state)->private_objs[__i].obj_state,	\
+	      1);							\
+	     (__i)++)							\
+		for_each_if (__funcs == obj_funcs)
+
+/**
  * drm_atomic_crtc_needs_modeset - compute combined modeset need
  * @state: &drm_crtc_state for the CRTC
  *
-- 
2.7.4

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[PATCH v6 2/5] drm/dp: Introduce MST topology state to track available link bandwidth

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

Link bandwidth is shared between multiple display streams in DP MST
configurations. The DP MST topology manager structure maintains the
shared link bandwidth for a primary link directly connected to the GPU. For
atomic modesetting drivers, checking if there is sufficient link bandwidth
for a mode needs to be done during the atomic_check phase to avoid failed
modesets. Let's encapsulate the available link bw information in a
private state structure so that bw can be allocated and released atomically
for each of the ports sharing the primary link.

v3: WARN_ON() if connection_mutex is not held (Archit)
v2: Included kernel doc, moved state initialization and switched to
kmemdup() for allocation (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 75 +++++++++++++++++++++++++++++++++++
 include/drm/drm_dp_mst_helper.h       | 20 ++++++++++
 2 files changed, 95 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index d3fc7e4..0ad0baa 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2936,6 +2936,69 @@ static void drm_dp_destroy_connector_work(struct work_struct *work)
 		(*mgr->cbs->hotplug)(mgr);
 }
 
+void *drm_dp_mst_duplicate_state(struct drm_atomic_state *state, void *obj)
+{
+	struct drm_dp_mst_topology_mgr *mgr = obj;
+	struct drm_dp_mst_topology_state *new_mst_state;
+
+	if (WARN_ON(!mgr->state))
+		return NULL;
+
+	new_mst_state = kmemdup(mgr->state, sizeof(*new_mst_state), GFP_KERNEL);
+	if (new_mst_state)
+		new_mst_state->state = state;
+	return new_mst_state;
+}
+
+void drm_dp_mst_swap_state(void *obj, void **obj_state_ptr)
+{
+	struct drm_dp_mst_topology_mgr *mgr = obj;
+	struct drm_dp_mst_topology_state **topology_state_ptr;
+
+	topology_state_ptr = (struct drm_dp_mst_topology_state **)obj_state_ptr;
+
+	mgr->state->state = (*topology_state_ptr)->state;
+	swap(*topology_state_ptr, mgr->state);
+	mgr->state->state = NULL;
+}
+
+void drm_dp_mst_destroy_state(void *obj_state)
+{
+	kfree(obj_state);
+}
+
+static const struct drm_private_state_funcs mst_state_funcs = {
+	.duplicate_state = drm_dp_mst_duplicate_state,
+	.swap_state = drm_dp_mst_swap_state,
+	.destroy_state = drm_dp_mst_destroy_state,
+};
+
+/**
+ * drm_atomic_get_mst_topology_state: get MST topology state
+ *
+ * @state: global atomic state
+ * @mgr: MST topology manager, also the private object in this case
+ *
+ * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
+ * state vtable so that the private object state returned is that of a MST
+ * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
+ * to care of the locking, so warn if don't hold the connection_mutex.
+ *
+ * RETURNS:
+ *
+ * The MST topology state or error pointer.
+ */
+struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
+								    struct drm_dp_mst_topology_mgr *mgr)
+{
+	struct drm_device *dev = mgr->dev;
+
+	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
+	return drm_atomic_get_private_obj_state(state, mgr,
+						&mst_state_funcs);
+}
+EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
+
 /**
  * drm_dp_mst_topology_mgr_init - initialise a topology manager
  * @mgr: manager struct to initialise
@@ -2980,6 +3043,15 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
 	if (test_calc_pbn_mode() < 0)
 		DRM_ERROR("MST PBN self-test failed\n");
 
+	mgr->state = kzalloc(sizeof(*mgr->state), GFP_KERNEL);
+	if (mgr->state == NULL)
+		return -ENOMEM;
+	mgr->state->mgr = mgr;
+
+	/* max. time slots - one slot for MTP header */
+	mgr->state->avail_slots = 63;
+	mgr->funcs = &mst_state_funcs;
+
 	return 0;
 }
 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
@@ -3000,6 +3072,9 @@ void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
 	mutex_unlock(&mgr->payload_lock);
 	mgr->dev = NULL;
 	mgr->aux = NULL;
+	kfree(mgr->state);
+	mgr->state = NULL;
+	mgr->funcs = NULL;
 }
 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
 
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index 5b02476..0b371df 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -24,6 +24,7 @@
 
 #include <linux/types.h>
 #include <drm/drm_dp_helper.h>
+#include <drm/drm_atomic.h>
 
 struct drm_dp_mst_branch;
 
@@ -403,6 +404,12 @@ struct drm_dp_payload {
 	int vcpi;
 };
 
+struct drm_dp_mst_topology_state {
+	int avail_slots;
+	struct drm_atomic_state *state;
+	struct drm_dp_mst_topology_mgr *mgr;
+};
+
 /**
  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
  *
@@ -481,6 +488,16 @@ struct drm_dp_mst_topology_mgr {
 	int pbn_div;
 
 	/**
+	 * @state: State information for topology manager
+	 */
+	struct drm_dp_mst_topology_state *state;
+
+	/**
+	 * @funcs: Atomic helper callbacks
+	 */
+	const struct drm_private_state_funcs *funcs;
+
+	/**
 	 * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
 	 * &drm_dp_sideband_msg_tx.state once they are queued
 	 */
@@ -596,4 +613,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 
 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
+struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
+								    struct drm_dp_mst_topology_mgr *mgr);
+
 #endif
-- 
2.7.4

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[PATCH v6 3/5] drm/dp: Add DP MST helpers to atomically find and release vcpi slots

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

drm_dp_atomic_find_vcpi_slots() should be called from ->atomic_check() to
check there are sufficient vcpi slots for a mode and to add that to the
state. This should be followed by a call to drm_dp_mst_allocate_vcpi()
in ->atomic_commit() to initialize a struct vcpi for the port.

drm_dp_atomic_release_vcpi_slots() should be called from
->atomic_check() to release a port's vcpi slot allocation from the
state.

Drivers that do not make use of this atomic helper are expected to call
drm_dp_find_vcpi_slots() instead before calling
drm_dp_mst_allocate_vcpi().

v3: drm_dp_atomic_release_vcpi_slots() now needs to know how many slots
    to release as we may not have a valid reference to port.
v2:
Added checks for verifying the port reference is valid
Moved get_mst_topology_state() into the helpers (Daniel)
Changed find_vcpi_slots() to not depend on current allocation

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 76 +++++++++++++++++++++++++++++++++++
 include/drm/drm_dp_mst_helper.h       |  6 +++
 2 files changed, 82 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 0ad0baa..cf01ed3 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2498,6 +2498,82 @@ static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
 }
 
 /**
+ * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
+ * @state: global atomic state
+ * @mgr: MST topology manager for the port
+ * @port: port to find vcpi slots for
+ * @pbn: bandwidth required for the mode in PBN
+ *
+ * RETURNS:
+ * Total slots in the atomic state assigned for this port or error
+ */
+int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
+				  struct drm_dp_mst_topology_mgr *mgr,
+				  struct drm_dp_mst_port *port, int pbn)
+{
+	struct drm_dp_mst_topology_state *topology_state;
+	int req_slots;
+
+	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
+	if (topology_state == NULL)
+		return -ENOMEM;
+
+	port = drm_dp_get_validated_port_ref(mgr, port);
+	if (port == NULL)
+		return -EINVAL;
+	req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
+	DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
+			req_slots, topology_state->avail_slots);
+
+	if (req_slots > topology_state->avail_slots) {
+		drm_dp_put_port(port);
+		return -ENOSPC;
+	}
+
+	topology_state->avail_slots -= req_slots;
+	DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
+
+	drm_dp_put_port(port);
+	return req_slots;
+}
+EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
+
+/**
+ * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
+ * @state: global atomic state
+ * @mgr: MST topology manager for the port
+ * @port: port to release the vcpi slots for
+ * @slots: number of vcpi slots to release for @port
+ *
+ * RETURNS:
+ * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or
+ * negative error code
+ */
+int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
+				     struct drm_dp_mst_topology_mgr *mgr,
+				     struct drm_dp_mst_port *port, int slots)
+{
+	struct drm_dp_mst_topology_state *topology_state;
+
+	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
+	if (topology_state == NULL)
+		return -ENOMEM;
+
+	/* We cannot rely on port->vcpi.num_slots to update
+	 * topology_state->avail_slots as the port may not exist if the parent
+	 * branch device was unplugged. This should be fixed by tracking
+	 * per-port slot allocation in drm_dp_mst_topology_state instead of
+	 * depending on the caller to tell us how many slots to release.
+	 */
+	topology_state->avail_slots += slots;
+	DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
+			slots, topology_state->avail_slots);
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
+
+/**
  * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
  * @mgr: manager for this port
  * @port: port to allocate a virtual channel for.
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index 0b371df..c781ff7 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -615,5 +615,11 @@ void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
 								    struct drm_dp_mst_topology_mgr *mgr);
+int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
+				  struct drm_dp_mst_topology_mgr *mgr,
+				  struct drm_dp_mst_port *port, int pbn);
+int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
+				     struct drm_dp_mst_topology_mgr *mgr,
+				     struct drm_dp_mst_port *port, int slots);
 
 #endif
-- 
2.7.4

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[PATCH v6 4/5] drm: Connector helper function to release resources

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

Having an ->atomic_release callback is useful to release shared resources
that get allocated in compute_config(). This function is expected to be
called in the atomic_check() phase before new resources are acquired.

v5: Return an int (Maarten)
v4: Document that the function is conditionally called and before
other atomic_checks() (Daniel)
v3: Use the new 'for_each_oldnew_connector_in_state()' macro.
v2: Moved the caller hunk to this patch (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_atomic_helper.c      | 22 ++++++++++++++++++++++
 include/drm/drm_modeset_helper_vtables.h | 20 ++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index d14094d..57d2e50 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -586,6 +586,28 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
 		}
 	}
 
+	for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
+		const struct drm_connector_helper_funcs *conn_funcs;
+		struct drm_crtc_state *crtc_state;
+
+		conn_funcs = connector->helper_private;
+		if (!conn_funcs->atomic_release)
+			continue;
+
+		if (!old_connector_state->crtc)
+			continue;
+
+		crtc_state = drm_atomic_get_existing_crtc_state(state, old_connector_state->crtc);
+
+		if (crtc_state->connectors_changed ||
+		    crtc_state->mode_changed ||
+		    (crtc_state->active_changed && !crtc_state->active)) {
+			ret = conn_funcs->atomic_release(connector, new_connector_state);
+			if (ret != 0)
+				return ret;
+		}
+	}
+
 	return mode_fixup(state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
index 091c422..36a4b16 100644
--- a/include/drm/drm_modeset_helper_vtables.h
+++ b/include/drm/drm_modeset_helper_vtables.h
@@ -836,6 +836,26 @@ struct drm_connector_helper_funcs {
 	 */
 	struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector,
 						   struct drm_connector_state *connector_state);
+
+	/**
+	 * @atomic_release:
+	 *
+	 * This function is conditionally called to release shared resources
+	 * when the attached CRTC's mode changes or it's connectors change or
+	 * becomes inactive. It is called before the corresponding
+	 * &drm_crtc_helper_funcs.atomic_check or
+	 * &drm_crtc_helper_funcs.mode_fixup hooks are called.
+	 *
+	 * NOTE:
+	 *
+	 * This function is called in the check phase of an atomic update.
+	 *
+	 * RETURNS:
+	 *
+	 * 0 on success or negative error codes on failure.
+	 */
+	int (*atomic_release)(struct drm_connector *connector,
+			       struct drm_connector_state *connector_state);
 };
 
 /**
-- 
2.7.4

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[PATCH v6 5/5] drm/dp: Track MST link bandwidth

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

Use the added helpers to track MST link bandwidth for atomic modesets.
Link bw is acquired in the ->atomic_check() phase when CRTCs are being
enabled with drm_atomic_find_vcpi_slots() instead of drm_find_vcpi_slots().
Similarly, link bw is released during ->atomic_check() with the connector
helper callback ->atomic_release() when CRTCs are disabled.

v4: Return an int from intel_dp_mst_atomic_release() (Maarten)

v3:
Handled the case where ->atomic_release() is called more than once
during an atomic_check() for the same state.

v2:
Squashed atomic_release() implementation and caller (Daniel)
Fixed logic for connector-crtc switching case (Daniel)
Fixed logic for suspend-resume case.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/i915/intel_dp_mst.c | 48 +++++++++++++++++++++++++++++++------
 1 file changed, 41 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index c1f62eb..1db3845 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -39,9 +39,9 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	struct intel_dp *intel_dp = &intel_dig_port->dp;
 	struct intel_connector *connector =
 		to_intel_connector(conn_state->connector);
-	struct drm_atomic_state *state;
+	struct drm_atomic_state *state = pipe_config->base.state;
 	int bpp;
-	int lane_count, slots;
+	int lane_count, slots = 0;
 	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 	int mst_pbn;
 
@@ -57,30 +57,63 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	 * seem to suggest we should do otherwise.
 	 */
 	lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
-
 	pipe_config->lane_count = lane_count;
 
 	pipe_config->pipe_bpp = bpp;
 	pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
 
-	state = pipe_config->base.state;
-
 	if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
 		pipe_config->has_audio = true;
-	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
 
+	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
 	pipe_config->pbn = mst_pbn;
-	slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
 
 	intel_link_compute_m_n(bpp, lane_count,
 			       adjusted_mode->crtc_clock,
 			       pipe_config->port_clock,
 			       &pipe_config->dp_m_n);
 
+	if (pipe_config->base.active) {
+		slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
+					      connector->port, mst_pbn);
+		if (slots < 0) {
+			DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
+			return false;
+		}
+	}
 	pipe_config->dp_m_n.tu = slots;
 
 	return true;
+}
 
+static int intel_dp_mst_atomic_release(struct drm_connector *connector,
+					struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst;
+	struct drm_dp_mst_topology_mgr *mgr;
+	struct drm_encoder *encoder;
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct drm_atomic_state *state = conn_state->state;
+	struct drm_crtc *old_crtc = connector->state->crtc;
+	struct intel_crtc_state *old_crtc_state =
+		to_intel_crtc_state(old_crtc->state);
+	int slots;
+	int ret = 0;
+
+	encoder = connector->state->best_encoder;
+	intel_mst = enc_to_mst(encoder);
+	mgr = &intel_mst->primary->dp.mst_mgr;
+
+	slots = old_crtc_state->dp_m_n.tu;
+	if (slots > 0) {
+		ret = drm_dp_atomic_release_vcpi_slots(state, mgr,
+					 intel_connector->port, slots);
+		if (ret)
+			DRM_DEBUG_KMS("failed releasing %d vcpi slots:%d\n", slots, ret);
+		else
+			old_crtc_state->dp_m_n.tu = 0;
+	}
+	return ret;
 }
 
 static void intel_mst_disable_dp(struct intel_encoder *encoder,
@@ -387,6 +420,7 @@ static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_fun
 	.mode_valid = intel_dp_mst_mode_valid,
 	.atomic_best_encoder = intel_mst_atomic_best_encoder,
 	.best_encoder = intel_mst_best_encoder,
+	.atomic_release = intel_dp_mst_atomic_release,
 };
 
 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
-- 
2.7.4

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[PATCH v5 5/5] drm/dp: Track MST link bandwidth

[Dhinakaran Pandiyan]

From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>

Use the added helpers to track MST link bandwidth for atomic modesets.
Link bw is acquired in the ->atomic_check() phase when CRTCs are being
enabled with drm_atomic_find_vcpi_slots() instead of drm_find_vcpi_slots().
Similarly, link bw is released during ->atomic_check() with the connector
helper callback ->atomic_release() when CRTCs are disabled.

v3:
Handled the case where ->atomic_release() is called more than once
during an atomic_check() for the same state.

v2:
Squashed atomic_release() implementation and caller (Daniel)
Fixed logic for connector-crtc switching case (Daniel)
Fixed logic for suspend-resume case.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/i915/intel_dp_mst.c | 48 +++++++++++++++++++++++++++++++------
 1 file changed, 41 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index c1f62eb..8f93037 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -39,9 +39,9 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	struct intel_dp *intel_dp = &intel_dig_port->dp;
 	struct intel_connector *connector =
 		to_intel_connector(conn_state->connector);
-	struct drm_atomic_state *state;
+	struct drm_atomic_state *state = pipe_config->base.state;
 	int bpp;
-	int lane_count, slots;
+	int lane_count, slots = 0;
 	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 	int mst_pbn;
 
@@ -57,30 +57,63 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	 * seem to suggest we should do otherwise.
 	 */
 	lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
-
 	pipe_config->lane_count = lane_count;
 
 	pipe_config->pipe_bpp = bpp;
 	pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
 
-	state = pipe_config->base.state;
-
 	if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
 		pipe_config->has_audio = true;
-	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
 
+	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
 	pipe_config->pbn = mst_pbn;
-	slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
 
 	intel_link_compute_m_n(bpp, lane_count,
 			       adjusted_mode->crtc_clock,
 			       pipe_config->port_clock,
 			       &pipe_config->dp_m_n);
 
+	if (pipe_config->base.active) {
+		slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
+					      connector->port, mst_pbn);
+		if (slots < 0) {
+			DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
+			return false;
+		}
+	}
 	pipe_config->dp_m_n.tu = slots;
 
 	return true;
+}
 
+static void intel_dp_mst_atomic_release(struct drm_connector *connector,
+					struct drm_connector_state *conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst;
+	struct drm_dp_mst_topology_mgr *mgr;
+	struct drm_encoder *encoder;
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct drm_atomic_state *state = conn_state->state;
+	struct drm_crtc *old_crtc = connector->state->crtc;
+	struct intel_crtc_state *old_crtc_state =
+		to_intel_crtc_state(old_crtc->state);
+	int slots;
+
+	encoder = connector->state->best_encoder;
+	intel_mst = enc_to_mst(encoder);
+	mgr = &intel_mst->primary->dp.mst_mgr;
+
+	slots = old_crtc_state->dp_m_n.tu;
+	if (slots > 0) {
+		int ret;
+
+		ret = drm_dp_atomic_release_vcpi_slots(state, mgr,
+					 intel_connector->port);
+		if (ret == slots)
+			old_crtc_state->dp_m_n.tu = 0;
+		else
+			DRM_DEBUG_KMS("failed releasing %d vcpi slots:%d\n", slots, ret);
+	}
 }
 
 static void intel_mst_disable_dp(struct intel_encoder *encoder,
@@ -387,6 +420,7 @@ static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_fun
 	.mode_valid = intel_dp_mst_mode_valid,
 	.atomic_best_encoder = intel_mst_atomic_best_encoder,
 	.best_encoder = intel_mst_best_encoder,
+	.atomic_release = intel_dp_mst_atomic_release,
 };
 
 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
-- 
2.7.4

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✗ Fi.CI.BAT: warning for Adding driver-private objects to atomic state

[Patchwork]

== Series Details ==

Series: Adding driver-private objects to atomic state
URL   : https://patchwork.freedesktop.org/series/22177/
State : warning

== Summary ==

Series 22177v1 Adding driver-private objects to atomic state
https://patchwork.freedesktop.org/api/1.0/series/22177/revisions/1/mbox/

Test gem_exec_suspend:
        Subgroup basic-s4-devices:
                dmesg-warn -> PASS       (fi-kbl-7560u) fdo#100125
Test kms_flip:
        Subgroup basic-flip-vs-wf_vblank:
                fail       -> PASS       (fi-skl-6770hq) fdo#99739
Test kms_pipe_crc_basic:
        Subgroup read-crc-pipe-a-frame-sequence:
                pass       -> DMESG-WARN (fi-byt-n2820)

fdo#100125 https://bugs.freedesktop.org/show_bug.cgi?id=100125
fdo#99739 https://bugs.freedesktop.org/show_bug.cgi?id=99739

fi-bdw-5557u     total:278  pass:267  dwarn:0   dfail:0   fail:0   skip:11  time: 433s
fi-bdw-gvtdvm    total:278  pass:256  dwarn:8   dfail:0   fail:0   skip:14  time: 426s
fi-bsw-n3050     total:278  pass:239  dwarn:0   dfail:0   fail:0   skip:39  time: 575s
fi-bxt-j4205     total:278  pass:259  dwarn:0   dfail:0   fail:0   skip:19  time: 514s
fi-bxt-t5700     total:278  pass:258  dwarn:0   dfail:0   fail:0   skip:20  time: 559s
fi-byt-j1900     total:278  pass:251  dwarn:0   dfail:0   fail:0   skip:27  time: 481s
fi-byt-n2820     total:278  pass:246  dwarn:1   dfail:0   fail:0   skip:31  time: 485s
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: 410s
fi-ilk-650       total:278  pass:228  dwarn:0   dfail:0   fail:0   skip:50  time: 420s
fi-ivb-3520m     total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 496s
fi-ivb-3770      total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 465s
fi-kbl-7500u     total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 457s
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: 450s
fi-skl-6700hq    total:278  pass:261  dwarn:0   dfail:0   fail:0   skip:17  time: 578s
fi-skl-6700k     total:278  pass:256  dwarn:4   dfail:0   fail:0   skip:18  time: 459s
fi-skl-6770hq    total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10  time: 483s
fi-skl-gvtdvm    total:278  pass:265  dwarn:0   dfail:0   fail:0   skip:13  time: 432s
fi-snb-2520m     total:278  pass:250  dwarn:0   dfail:0   fail:0   skip:28  time: 535s
fi-snb-2600      total:278  pass:249  dwarn:0   dfail:0   fail:0   skip:29  time: 412s

66e17cacf58689a0d6ca38138217e667d100a64a drm-tip: 2017y-03m-30d-10h-12m-59s UTC integration manifest
6f58b7f drm/dp: Track MST link bandwidth
1cbb2f6 drm: Connector helper function to release resources
3d67bbb drm/dp: Add DP MST helpers to atomically find and release vcpi slots
24d4f95 drm/dp: Introduce MST topology state to track available link bandwidth
3168f00 drm: Add driver-private objects to atomic state

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_4355/
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✗ Fi.CI.BAT: failure for Adding driver-private objects to atomic state (rev6)

[Patchwork]

== Series Details ==

Series: Adding driver-private objects to atomic state (rev6)
URL   : https://patchwork.freedesktop.org/series/22177/
State : failure

== Summary ==

  CC      drivers/usb/host/xhci-dbg.o
  CC      net/ipv4/udp_diag.o
  CC      net/ipv4/tcp_cubic.o
  CC      net/ipv4/xfrm4_policy.o
  CC      drivers/usb/host/xhci-trace.o
  CC      drivers/usb/host/xhci-pci.o
  CC      net/ipv4/xfrm4_input.o
  CC      net/ipv4/xfrm4_state.o
  CC      net/ipv4/xfrm4_output.o
  CC      net/ipv4/xfrm4_protocol.o
  LD      drivers/video/backlight/built-in.o
  LD      drivers/mmc/core/mmc_core.o
  LD      drivers/mmc/host/built-in.o
  LD      drivers/nvme/host/nvme.o
  LD      drivers/nvme/host/built-in.o
  LD      drivers/nvme/built-in.o
  LD      drivers/pci/pcie/pcieportdrv.o
  LD      net/key/built-in.o
  LD      drivers/rtc/built-in.o
  LD      net/unix/unix.o
  LD      net/netlink/built-in.o
  LD      net/unix/built-in.o
  LD      lib/lz4/built-in.o
  LD [M]  drivers/ssb/ssb.o
  LD [M]  drivers/misc/mei/mei-me.o
  LD      drivers/md/dm-mod.o
  LD      drivers/misc/built-in.o
  LD      drivers/tty/serial/8250/8250.o
  LD      kernel/events/built-in.o
  LD      drivers/pci/pcie/aer/aerdriver.o
  LD      drivers/pci/pcie/aer/built-in.o
  LD      drivers/usb/storage/usb-storage.o
  LD      drivers/pci/pcie/built-in.o
  LD      drivers/usb/storage/built-in.o
  LD      drivers/mmc/core/mmc_block.o
  LD      drivers/mmc/core/built-in.o
  LD      drivers/mmc/built-in.o
  LD [M]  drivers/net/ethernet/broadcom/genet/genet.o
  LD [M]  drivers/usb/serial/usbserial.o
  LD      drivers/video/fbdev/core/fb.o
  AR      lib/lib.a
  LD      net/packet/built-in.o
  LD      drivers/video/fbdev/core/built-in.o
  EXPORTS lib/lib-ksyms.o
  LD      kernel/sched/built-in.o
  LD      drivers/thermal/thermal_sys.o
  LD      drivers/thermal/built-in.o
  LD      lib/built-in.o
  LD      kernel/built-in.o
  LD [M]  sound/pci/hda/snd-hda-codec-generic.o
  LD      sound/pci/built-in.o
  LD      net/ipv6/ipv6.o
  LD      net/ipv6/built-in.o
  LD      drivers/iommu/built-in.o
  LD      drivers/tty/serial/8250/8250_base.o
  LD      drivers/tty/serial/8250/built-in.o
  LD      sound/built-in.o
  LD      drivers/tty/serial/built-in.o
  LD [M]  drivers/net/ethernet/intel/igbvf/igbvf.o
  LD      drivers/usb/gadget/libcomposite.o
  LD      drivers/video/fbdev/built-in.o
  LD      drivers/usb/gadget/udc/udc-core.o
  LD      drivers/pci/built-in.o
  LD      drivers/usb/gadget/udc/built-in.o
  LD      drivers/usb/gadget/built-in.o
  LD      net/xfrm/built-in.o
  LD      drivers/video/console/built-in.o
  LD      drivers/video/built-in.o
  LD      drivers/scsi/scsi_mod.o
  LD      drivers/spi/built-in.o
  LD      drivers/scsi/sd_mod.o
  LD      drivers/scsi/built-in.o
  LD      drivers/usb/core/usbcore.o
  LD      drivers/usb/core/built-in.o
  CC      arch/x86/kernel/cpu/capflags.o
  LD      arch/x86/kernel/cpu/built-in.o
  LD [M]  drivers/net/ethernet/intel/e1000/e1000.o
  LD      arch/x86/kernel/built-in.o
  LD      drivers/tty/vt/built-in.o
  LD      fs/btrfs/btrfs.o
  LD      drivers/tty/built-in.o
  LD      arch/x86/built-in.o
  LD      fs/btrfs/built-in.o
  LD      net/ipv4/built-in.o
  LD      fs/ext4/ext4.o
  LD      fs/ext4/built-in.o
  LD      drivers/md/md-mod.o
  LD      drivers/md/built-in.o
  LD      fs/built-in.o
  LD [M]  drivers/net/ethernet/intel/igb/igb.o
  LD      net/core/built-in.o
  LD      drivers/usb/host/xhci-hcd.o
  LD      net/built-in.o
  LD [M]  drivers/net/ethernet/intel/e1000e/e1000e.o
  LD      drivers/usb/host/built-in.o
  LD      drivers/usb/built-in.o
  LD      drivers/net/ethernet/built-in.o
  LD      drivers/net/built-in.o
Makefile:1002: recipe for target 'drivers' failed
make: *** [drivers] Error 2

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Re: ✗ Fi.CI.BAT: failure for Adding driver-private objects to atomic state (rev6)

[Pandiyan, Dhinakaran]

On Tue, 2017-04-04 at 20:36 +0000, Patchwork wrote:
> == Series Details ==
> 
> Series: Adding driver-private objects to atomic state (rev6)
> URL   : https://patchwork.freedesktop.org/series/22177/
> State : failure
> 

I guess the in-reply-to confused CI. Here's the result for the same
series sent to try-bot. 
https://lists.freedesktop.org/archives/intel-gfx-trybot/2017-April/017329.html

-DK



> == Summary ==
> 
>   CC      drivers/usb/host/xhci-dbg.o
>   CC      net/ipv4/udp_diag.o
>   CC      net/ipv4/tcp_cubic.o
>   CC      net/ipv4/xfrm4_policy.o
>   CC      drivers/usb/host/xhci-trace.o
>   CC      drivers/usb/host/xhci-pci.o
>   CC      net/ipv4/xfrm4_input.o
>   CC      net/ipv4/xfrm4_state.o
>   CC      net/ipv4/xfrm4_output.o
>   CC      net/ipv4/xfrm4_protocol.o
>   LD      drivers/video/backlight/built-in.o
>   LD      drivers/mmc/core/mmc_core.o
>   LD      drivers/mmc/host/built-in.o
>   LD      drivers/nvme/host/nvme.o
>   LD      drivers/nvme/host/built-in.o
>   LD      drivers/nvme/built-in.o
>   LD      drivers/pci/pcie/pcieportdrv.o
>   LD      net/key/built-in.o
>   LD      drivers/rtc/built-in.o
>   LD      net/unix/unix.o
>   LD      net/netlink/built-in.o
>   LD      net/unix/built-in.o
>   LD      lib/lz4/built-in.o
>   LD [M]  drivers/ssb/ssb.o
>   LD [M]  drivers/misc/mei/mei-me.o
>   LD      drivers/md/dm-mod.o
>   LD      drivers/misc/built-in.o
>   LD      drivers/tty/serial/8250/8250.o
>   LD      kernel/events/built-in.o
>   LD      drivers/pci/pcie/aer/aerdriver.o
>   LD      drivers/pci/pcie/aer/built-in.o
>   LD      drivers/usb/storage/usb-storage.o
>   LD      drivers/pci/pcie/built-in.o
>   LD      drivers/usb/storage/built-in.o
>   LD      drivers/mmc/core/mmc_block.o
>   LD      drivers/mmc/core/built-in.o
>   LD      drivers/mmc/built-in.o
>   LD [M]  drivers/net/ethernet/broadcom/genet/genet.o
>   LD [M]  drivers/usb/serial/usbserial.o
>   LD      drivers/video/fbdev/core/fb.o
>   AR      lib/lib.a
>   LD      net/packet/built-in.o
>   LD      drivers/video/fbdev/core/built-in.o
>   EXPORTS lib/lib-ksyms.o
>   LD      kernel/sched/built-in.o
>   LD      drivers/thermal/thermal_sys.o
>   LD      drivers/thermal/built-in.o
>   LD      lib/built-in.o
>   LD      kernel/built-in.o
>   LD [M]  sound/pci/hda/snd-hda-codec-generic.o
>   LD      sound/pci/built-in.o
>   LD      net/ipv6/ipv6.o
>   LD      net/ipv6/built-in.o
>   LD      drivers/iommu/built-in.o
>   LD      drivers/tty/serial/8250/8250_base.o
>   LD      drivers/tty/serial/8250/built-in.o
>   LD      sound/built-in.o
>   LD      drivers/tty/serial/built-in.o
>   LD [M]  drivers/net/ethernet/intel/igbvf/igbvf.o
>   LD      drivers/usb/gadget/libcomposite.o
>   LD      drivers/video/fbdev/built-in.o
>   LD      drivers/usb/gadget/udc/udc-core.o
>   LD      drivers/pci/built-in.o
>   LD      drivers/usb/gadget/udc/built-in.o
>   LD      drivers/usb/gadget/built-in.o
>   LD      net/xfrm/built-in.o
>   LD      drivers/video/console/built-in.o
>   LD      drivers/video/built-in.o
>   LD      drivers/scsi/scsi_mod.o
>   LD      drivers/spi/built-in.o
>   LD      drivers/scsi/sd_mod.o
>   LD      drivers/scsi/built-in.o
>   LD      drivers/usb/core/usbcore.o
>   LD      drivers/usb/core/built-in.o
>   CC      arch/x86/kernel/cpu/capflags.o
>   LD      arch/x86/kernel/cpu/built-in.o
>   LD [M]  drivers/net/ethernet/intel/e1000/e1000.o
>   LD      arch/x86/kernel/built-in.o
>   LD      drivers/tty/vt/built-in.o
>   LD      fs/btrfs/btrfs.o
>   LD      drivers/tty/built-in.o
>   LD      arch/x86/built-in.o
>   LD      fs/btrfs/built-in.o
>   LD      net/ipv4/built-in.o
>   LD      fs/ext4/ext4.o
>   LD      fs/ext4/built-in.o
>   LD      drivers/md/md-mod.o
>   LD      drivers/md/built-in.o
>   LD      fs/built-in.o
>   LD [M]  drivers/net/ethernet/intel/igb/igb.o
>   LD      net/core/built-in.o
>   LD      drivers/usb/host/xhci-hcd.o
>   LD      net/built-in.o
>   LD [M]  drivers/net/ethernet/intel/e1000e/e1000e.o
>   LD      drivers/usb/host/built-in.o
>   LD      drivers/usb/built-in.o
>   LD      drivers/net/ethernet/built-in.o
>   LD      drivers/net/built-in.o
> Makefile:1002: recipe for target 'drivers' failed
> make: *** [drivers] Error 2
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

_______________________________________________
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