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Commit 5fff80bb authored by Maarten Lankhorst's avatar Maarten Lankhorst Committed by Dave Airlie
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drm/atomic: Allow for holes in connector state, v2. 



Because we record connector_mask using 1 << drm_connector_index now
the connector_mask should stay the same even when other connectors
are removed. This was not the case with MST, in that case when removing
a connector all other connectors may change their index.

This is fixed by waiting until the first get_connector_state to allocate
connector_state, and force reallocation when state is too small.

As a side effect connector arrays no longer have to be preallocated,
and can be allocated on first use which means a less allocations in
the page flip only path.

Changes since v1:
- Whitespace. (Ville)
- Call ida_remove when destroying the connector. (Ville)
- u32 alloc -> int. (Ville)

Fixes: 14de6c44 ("drm/atomic: Remove drm_atomic_connectors_for_crtc.")
Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarLyude <cpaul@redhat.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 5441ea11

drivers/gpu/drm/drm_atomic.c

+20 −24
Original line number Diff line number Diff line
@@ -65,8 +65,6 @@ drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state) 
	 */

	state->allow_modeset = true;



	state->num_connector = ACCESS_ONCE(dev->mode_config.num_connector);



	state->crtcs = kcalloc(dev->mode_config.num_crtc,

			       sizeof(*state->crtcs), GFP_KERNEL);

	if (!state->crtcs)
@@ -83,16 +81,6 @@ drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state) 
				      sizeof(*state->plane_states), GFP_KERNEL);

	if (!state->plane_states)

		goto fail;

	state->connectors = kcalloc(state->num_connector,

				    sizeof(*state->connectors),

				    GFP_KERNEL);

	if (!state->connectors)

		goto fail;

	state->connector_states = kcalloc(state->num_connector,

					  sizeof(*state->connector_states),

					  GFP_KERNEL);

	if (!state->connector_states)

		goto fail;



	state->dev = dev;
@@ -823,19 +811,27 @@ drm_atomic_get_connector_state(struct drm_atomic_state *state, 


	index = drm_connector_index(connector);



	/*

	 * Construction of atomic state updates can race with a connector

	 * hot-add which might overflow. In this case flip the table and just

	 * restart the entire ioctl - no one is fast enough to livelock a cpu

	 * with physical hotplug events anyway.

	 *

	 * Note that we only grab the indexes once we have the right lock to

	 * prevent hotplug/unplugging of connectors. So removal is no problem,

	 * at most the array is a bit too large.

	 */

	if (index >= state->num_connector) {

		DRM_DEBUG_ATOMIC("Hot-added connector would overflow state array, restarting\n");

		return ERR_PTR(-EAGAIN);

		struct drm_connector **c;

		struct drm_connector_state **cs;

		int alloc = max(index + 1, config->num_connector);



		c = krealloc(state->connectors, alloc * sizeof(*state->connectors), GFP_KERNEL);

		if (!c)

			return ERR_PTR(-ENOMEM);



		state->connectors = c;

		memset(&state->connectors[state->num_connector], 0,

		       sizeof(*state->connectors) * (alloc - state->num_connector));



		cs = krealloc(state->connector_states, alloc * sizeof(*state->connector_states), GFP_KERNEL);

		if (!cs)

			return ERR_PTR(-ENOMEM);



		state->connector_states = cs;

		memset(&state->connector_states[state->num_connector], 0,

		       sizeof(*state->connector_states) * (alloc - state->num_connector));

		state->num_connector = alloc;

	}



	if (state->connector_states[index])

drivers/gpu/drm/drm_atomic_helper.c

+1 −1
Original line number Diff line number Diff line
@@ -1493,7 +1493,7 @@ void drm_atomic_helper_swap_state(struct drm_device *dev, 
{

	int i;



	for (i = 0; i < dev->mode_config.num_connector; i++) {

	for (i = 0; i < state->num_connector; i++) {

		struct drm_connector *connector = state->connectors[i];



		if (!connector)

drivers/gpu/drm/drm_crtc.c

+20 −29
Original line number Diff line number Diff line
@@ -918,12 +918,19 @@ int drm_connector_init(struct drm_device *dev, 
	connector->base.properties = &connector->properties;

	connector->dev = dev;

	connector->funcs = funcs;



	connector->connector_id = ida_simple_get(&config->connector_ida, 0, 0, GFP_KERNEL);

	if (connector->connector_id < 0) {

		ret = connector->connector_id;

		goto out_put;

	}



	connector->connector_type = connector_type;

	connector->connector_type_id =

		ida_simple_get(connector_ida, 1, 0, GFP_KERNEL);

	if (connector->connector_type_id < 0) {

		ret = connector->connector_type_id;

		goto out_put;

		goto out_put_id;

	}

	connector->name =

		kasprintf(GFP_KERNEL, "%s-%d",
@@ -931,7 +938,7 @@ int drm_connector_init(struct drm_device *dev, 
			  connector->connector_type_id);

	if (!connector->name) {

		ret = -ENOMEM;

		goto out_put;

		goto out_put_type_id;

	}



	INIT_LIST_HEAD(&connector->probed_modes);
@@ -959,7 +966,12 @@ int drm_connector_init(struct drm_device *dev, 
	}



	connector->debugfs_entry = NULL;



out_put_type_id:

	if (ret)

		ida_remove(connector_ida, connector->connector_type_id);

out_put_id:

	if (ret)

		ida_remove(&config->connector_ida, connector->connector_id);

out_put:

	if (ret)

		drm_mode_object_put(dev, &connector->base);
@@ -996,6 +1008,9 @@ void drm_connector_cleanup(struct drm_connector *connector) 
	ida_remove(&drm_connector_enum_list[connector->connector_type].ida,

		   connector->connector_type_id);



	ida_remove(&dev->mode_config.connector_ida,

		   connector->connector_id);



	kfree(connector->display_info.bus_formats);

	drm_mode_object_put(dev, &connector->base);

	kfree(connector->name);
@@ -1012,32 +1027,6 @@ void drm_connector_cleanup(struct drm_connector *connector) 
}

EXPORT_SYMBOL(drm_connector_cleanup);



/**

 * drm_connector_index - find the index of a registered connector

 * @connector: connector to find index for

 *

 * Given a registered connector, return the index of that connector within a DRM

 * device's list of connectors.

 */

unsigned int drm_connector_index(struct drm_connector *connector)

{

	unsigned int index = 0;

	struct drm_connector *tmp;

	struct drm_mode_config *config = &connector->dev->mode_config;



	WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));



	drm_for_each_connector(tmp, connector->dev) {

		if (tmp == connector)

			return index;



		index++;

	}



	BUG();

}

EXPORT_SYMBOL(drm_connector_index);



/**

 * drm_connector_register - register a connector

 * @connector: the connector to register
@@ -5789,6 +5778,7 @@ void drm_mode_config_init(struct drm_device *dev) 
	INIT_LIST_HEAD(&dev->mode_config.plane_list);

	idr_init(&dev->mode_config.crtc_idr);

	idr_init(&dev->mode_config.tile_idr);

	ida_init(&dev->mode_config.connector_ida);



	drm_modeset_lock_all(dev);

	drm_mode_create_standard_properties(dev);
@@ -5869,6 +5859,7 @@ void drm_mode_config_cleanup(struct drm_device *dev) 
		crtc->funcs->destroy(crtc);

	}



	ida_destroy(&dev->mode_config.connector_ida);

	idr_destroy(&dev->mode_config.tile_idr);

	idr_destroy(&dev->mode_config.crtc_idr);

	drm_modeset_lock_fini(&dev->mode_config.connection_mutex);

include/drm/drm_crtc.h

+7 −1
Original line number Diff line number Diff line
@@ -1166,6 +1166,7 @@ struct drm_connector { 
	struct drm_mode_object base;



	char *name;

	int connector_id;

	int connector_type;

	int connector_type_id;

	bool interlace_allowed;
@@ -2047,6 +2048,7 @@ struct drm_mode_config { 
	struct list_head fb_list;



	int num_connector;

	struct ida connector_ida;

	struct list_head connector_list;

	int num_encoder;

	struct list_head encoder_list;
@@ -2200,7 +2202,11 @@ int drm_connector_register(struct drm_connector *connector); 
void drm_connector_unregister(struct drm_connector *connector);



extern void drm_connector_cleanup(struct drm_connector *connector);

extern unsigned int drm_connector_index(struct drm_connector *connector);

static inline unsigned drm_connector_index(struct drm_connector *connector)

{

	return connector->connector_id;

}



/* helper to unplug all connectors from sysfs for device */

extern void drm_connector_unplug_all(struct drm_device *dev);