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media: v4l: async: Rework internal lists 

This patch re-arranges internal V4L2 async lists for preparation of
supporting multiple connections per sub-device as well as cleaning up used
lists.

The list of unbound V4L2 sub-devices shall be maintained for the purpose of
listing those sub-devices only, not for their bindin status. Also, the V4L2
async connections now have, instead of two list entries, a single list
entry in the notifier's list, be that either waiting or done lists, while
the notifier's asc_list is removed.

The one-to-one relation between a sub-device and a connection is still
maintained in this patch.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de> # imx6qp
Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> # rcar + adv746x
Tested-by: Aishwarya Kothari <aishwarya.kothari@toradex.com> # Apalis i.MX6Q with TC358743
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # Renesas RZ/G2L SMARC
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sakari Ailus 2023-04-18 14:00:54 +02:00 committed by Mauro Carvalho Chehab
parent 393cfcc02d
commit 9bf19fbf0c
8 changed files with 68 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/media/pci/intel/ipu3/ipu3-cio2.c
View File

@ -1421,7 +1421,7 @@ static int cio2_notifier_complete(struct v4l2_async_notifier *notifier)
struct cio2_queue *q; struct cio2_queue *q;
int ret; int ret;
list_for_each_entry(asd, &cio2->notifier.asc_list, asc_entry) { list_for_each_entry(asd, &cio2->notifier.done_list, asc_entry) {
s_asd = to_sensor_asd(asd); s_asd = to_sensor_asd(asd);
q = &cio2->queue[s_asd->csi2.port]; q = &cio2->queue[s_asd->csi2.port];

2
drivers/media/platform/renesas/rcar-vin/rcar-core.c
View File

@ -395,7 +395,7 @@ static int rvin_group_notifier_init(struct rvin_dev *vin, unsigned int port,
} }
} }
if (list_empty(&vin->group->notifier.asc_list)) if (list_empty(&vin->group->notifier.waiting_list))
return 0; return 0;
vin->group->notifier.ops = &rvin_group_notify_ops; vin->group->notifier.ops = &rvin_group_notify_ops;

2
drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
View File

@ -190,7 +190,7 @@ static int rzg2l_cru_mc_parse_of_graph(struct rzg2l_cru_dev *cru)
cru->notifier.ops = &rzg2l_cru_async_ops; cru->notifier.ops = &rzg2l_cru_async_ops;
if (list_empty(&cru->notifier.asc_list)) if (list_empty(&cru->notifier.waiting_list))
return 0; return 0;
ret = v4l2_async_nf_register(&cru->v4l2_dev, &cru->notifier); ret = v4l2_async_nf_register(&cru->v4l2_dev, &cru->notifier);

8
drivers/media/platform/xilinx/xilinx-vipp.c
View File

@ -56,7 +56,7 @@ xvip_graph_find_entity(struct xvip_composite_device *xdev,
struct xvip_graph_entity *entity; struct xvip_graph_entity *entity;
struct v4l2_async_connection *asd; struct v4l2_async_connection *asd;
list_for_each_entry(asd, &xdev->notifier.asc_list, asc_entry) { list_for_each_entry(asd, &xdev->notifier.done_list, asc_entry) {
entity = to_xvip_entity(asd); entity = to_xvip_entity(asd);
if (entity->asd.match.fwnode == fwnode) if (entity->asd.match.fwnode == fwnode)
return entity; return entity;
@ -291,7 +291,7 @@ static int xvip_graph_notify_complete(struct v4l2_async_notifier *notifier)
dev_dbg(xdev->dev, "notify complete, all subdevs registered\n"); dev_dbg(xdev->dev, "notify complete, all subdevs registered\n");
/* Create links for every entity. */ /* Create links for every entity. */
list_for_each_entry(asd, &xdev->notifier.asc_list, asc_entry) { list_for_each_entry(asd, &xdev->notifier.done_list, asc_entry) {
entity = to_xvip_entity(asd); entity = to_xvip_entity(asd);
ret = xvip_graph_build_one(xdev, entity); ret = xvip_graph_build_one(xdev, entity);
if (ret < 0) if (ret < 0)
@ -393,7 +393,7 @@ static int xvip_graph_parse(struct xvip_composite_device *xdev)
if (ret < 0) if (ret < 0)
return 0; return 0;
list_for_each_entry(asd, &xdev->notifier.asc_list, asc_entry) { list_for_each_entry(asd, &xdev->notifier.waiting_list, asc_entry) {
entity = to_xvip_entity(asd); entity = to_xvip_entity(asd);
ret = xvip_graph_parse_one(xdev, entity->asd.match.fwnode); ret = xvip_graph_parse_one(xdev, entity->asd.match.fwnode);
if (ret < 0) { if (ret < 0) {
@ -501,7 +501,7 @@ static int xvip_graph_init(struct xvip_composite_device *xdev)
goto done; goto done;
} }
if (list_empty(&xdev->notifier.asc_list)) { if (list_empty(&xdev->notifier.waiting_list)) {
dev_err(xdev->dev, "no subdev found in graph\n"); dev_err(xdev->dev, "no subdev found in graph\n");
ret = -ENOENT; ret = -ENOENT;
goto done; goto done;

102
drivers/media/v4l2-core/v4l2-async.c
View File

@ -160,7 +160,7 @@ v4l2_async_find_match(struct v4l2_async_notifier *notifier,
struct v4l2_async_match_desc *match); struct v4l2_async_match_desc *match);
struct v4l2_async_connection *asc; struct v4l2_async_connection *asc;
list_for_each_entry(asc, &notifier->waiting_list, waiting_entry) { list_for_each_entry(asc, &notifier->waiting_list, asc_entry) {
/* bus_type has been verified valid before */ /* bus_type has been verified valid before */
switch (asc->match.type) { switch (asc->match.type) {
case V4L2_ASYNC_MATCH_TYPE_I2C: case V4L2_ASYNC_MATCH_TYPE_I2C:
@ -232,14 +232,14 @@ v4l2_async_nf_find_v4l2_dev(struct v4l2_async_notifier *notifier)
static bool static bool
v4l2_async_nf_can_complete(struct v4l2_async_notifier *notifier) v4l2_async_nf_can_complete(struct v4l2_async_notifier *notifier)
{ {
struct v4l2_subdev *sd; struct v4l2_async_connection *asc;
if (!list_empty(&notifier->waiting_list)) if (!list_empty(&notifier->waiting_list))
return false; return false;
list_for_each_entry(sd, &notifier->done_list, async_list) { list_for_each_entry(asc, &notifier->done_list, asc_entry) {
struct v4l2_async_notifier *subdev_notifier = struct v4l2_async_notifier *subdev_notifier =
v4l2_async_find_subdev_notifier(sd); v4l2_async_find_subdev_notifier(asc->sd);
if (subdev_notifier && if (subdev_notifier &&
!v4l2_async_nf_can_complete(subdev_notifier)) !v4l2_async_nf_can_complete(subdev_notifier))
@ -333,12 +333,13 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
if (ret) if (ret)
goto err_call_unbind; goto err_call_unbind;
list_del(&asc->waiting_entry);
sd->asd = asc; sd->asd = asc;
sd->notifier = notifier; sd->notifier = notifier;
/* Move from the global subdevice list to notifier's done */ asc->sd = sd;
list_move(&sd->async_list, &notifier->done_list);
/* Move from the waiting list to notifier's done */
list_move(&asc->asc_entry, &notifier->done_list);
dev_dbg(notifier_dev(notifier), "v4l2-async: %s bound (ret %d)\n", dev_dbg(notifier_dev(notifier), "v4l2-async: %s bound (ret %d)\n",
dev_name(sd->dev), ret); dev_name(sd->dev), ret);
@ -422,25 +423,23 @@ static void v4l2_async_cleanup(struct v4l2_subdev *sd)
/* Unbind all sub-devices in the notifier tree. */ /* Unbind all sub-devices in the notifier tree. */
static void static void
v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier, v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier)
bool readd)
{ {
struct v4l2_subdev *sd, *tmp; struct v4l2_async_connection *asc, *asc_tmp;
list_for_each_entry_safe(sd, tmp, &notifier->done_list, async_list) { list_for_each_entry_safe(asc, asc_tmp, &notifier->done_list,
asc_entry) {
struct v4l2_async_notifier *subdev_notifier = struct v4l2_async_notifier *subdev_notifier =
v4l2_async_find_subdev_notifier(sd); v4l2_async_find_subdev_notifier(asc->sd);
if (subdev_notifier) if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier, true); v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
v4l2_async_nf_call_unbind(notifier, sd, sd->asd); v4l2_async_nf_call_unbind(notifier, asc->sd, asc);
if (readd) v4l2_async_cleanup(asc->sd);
list_add_tail(&sd->asd->waiting_entry, list_move_tail(&asc->asc_entry, &notifier->waiting_list);
&notifier->waiting_list); list_move(&asc->sd->async_list, &subdev_list);
v4l2_async_cleanup(sd); asc->sd = NULL;
list_move(&sd->async_list, &subdev_list);
} }
notifier->parent = NULL; notifier->parent = NULL;
@ -452,17 +451,16 @@ v4l2_async_nf_has_async_match_entry(struct v4l2_async_notifier *notifier,
struct v4l2_async_match_desc *match) struct v4l2_async_match_desc *match)
{ {
struct v4l2_async_connection *asc; struct v4l2_async_connection *asc;
struct v4l2_subdev *sd;
list_for_each_entry(asc, &notifier->waiting_list, waiting_entry) list_for_each_entry(asc, &notifier->waiting_list, asc_entry)
if (v4l2_async_match_equal(&asc->match, match)) if (v4l2_async_match_equal(&asc->match, match))
return true; return true;
list_for_each_entry(sd, &notifier->done_list, async_list) { list_for_each_entry(asc, &notifier->done_list, asc_entry) {
if (WARN_ON(!sd->asd)) if (WARN_ON(!asc->sd->asd))
continue; continue;
if (v4l2_async_match_equal(&sd->asd->match, match)) if (v4l2_async_match_equal(&asc->match, match))
return true; return true;
} }
@ -477,16 +475,24 @@ static bool
v4l2_async_nf_has_async_match(struct v4l2_async_notifier *notifier, v4l2_async_nf_has_async_match(struct v4l2_async_notifier *notifier,
struct v4l2_async_match_desc *match) struct v4l2_async_match_desc *match)
{ {
struct v4l2_async_connection *asc; struct list_head *heads[] = {
&notifier->waiting_list,
&notifier->done_list,
};
unsigned int i;
lockdep_assert_held(&list_lock); lockdep_assert_held(&list_lock);
/* Check that an asd is not being added more than once. */ /* Check that an asd is not being added more than once. */
list_for_each_entry(asc, &notifier->asc_list, asc_entry) { for (i = 0; i < ARRAY_SIZE(heads); i++) {
if (&asc->match == match) struct v4l2_async_connection *asc;
continue;
if (v4l2_async_match_equal(&asc->match, match)) list_for_each_entry(asc, heads[i], asc_entry) {
return true; if (&asc->match == match)
continue;
if (v4l2_async_match_equal(&asc->match, match))
return true;
}
} }
/* Check that an asc does not exist in other notifiers. */ /* Check that an asc does not exist in other notifiers. */
@ -521,7 +527,8 @@ static int v4l2_async_nf_match_valid(struct v4l2_async_notifier *notifier,
void v4l2_async_nf_init(struct v4l2_async_notifier *notifier) void v4l2_async_nf_init(struct v4l2_async_notifier *notifier)
{ {
INIT_LIST_HEAD(&notifier->asc_list); INIT_LIST_HEAD(&notifier->waiting_list);
INIT_LIST_HEAD(&notifier->done_list);
} }
EXPORT_SYMBOL(v4l2_async_nf_init); EXPORT_SYMBOL(v4l2_async_nf_init);
@ -530,17 +537,12 @@ static int __v4l2_async_nf_register(struct v4l2_async_notifier *notifier)
struct v4l2_async_connection *asc; struct v4l2_async_connection *asc;
int ret; int ret;
INIT_LIST_HEAD(&notifier->waiting_list);
INIT_LIST_HEAD(&notifier->done_list);
mutex_lock(&list_lock); mutex_lock(&list_lock);
list_for_each_entry(asc, &notifier->asc_list, asc_entry) { list_for_each_entry(asc, &notifier->waiting_list, asc_entry) {
ret = v4l2_async_nf_match_valid(notifier, &asc->match); ret = v4l2_async_nf_match_valid(notifier, &asc->match);
if (ret) if (ret)
goto err_unlock; goto err_unlock;
list_add_tail(&asc->waiting_entry, &notifier->waiting_list);
} }
ret = v4l2_async_nf_try_all_subdevs(notifier); ret = v4l2_async_nf_try_all_subdevs(notifier);
@ -562,7 +564,7 @@ err_unbind:
/* /*
* On failure, unbind all sub-devices registered through this notifier. * On failure, unbind all sub-devices registered through this notifier.
*/ */
v4l2_async_nf_unbind_all_subdevs(notifier, false); v4l2_async_nf_unbind_all_subdevs(notifier);
err_unlock: err_unlock:
mutex_unlock(&list_lock); mutex_unlock(&list_lock);
@ -612,7 +614,7 @@ __v4l2_async_nf_unregister(struct v4l2_async_notifier *notifier)
if (!notifier || (!notifier->v4l2_dev && !notifier->sd)) if (!notifier || (!notifier->v4l2_dev && !notifier->sd))
return; return;
v4l2_async_nf_unbind_all_subdevs(notifier, false); v4l2_async_nf_unbind_all_subdevs(notifier);
notifier->sd = NULL; notifier->sd = NULL;
notifier->v4l2_dev = NULL; notifier->v4l2_dev = NULL;
@ -634,10 +636,12 @@ static void __v4l2_async_nf_cleanup(struct v4l2_async_notifier *notifier)
{ {
struct v4l2_async_connection *asc, *tmp; struct v4l2_async_connection *asc, *tmp;
if (!notifier || !notifier->asc_list.next) if (!notifier || !notifier->waiting_list.next)
return; return;
list_for_each_entry_safe(asc, tmp, &notifier->asc_list, asc_entry) { WARN_ON(!list_empty(&notifier->done_list));
list_for_each_entry_safe(asc, tmp, &notifier->waiting_list, asc_entry) {
switch (asc->match.type) { switch (asc->match.type) {
case V4L2_ASYNC_MATCH_TYPE_FWNODE: case V4L2_ASYNC_MATCH_TYPE_FWNODE:
fwnode_handle_put(asc->match.fwnode); fwnode_handle_put(asc->match.fwnode);
@ -667,7 +671,7 @@ static int __v4l2_async_nf_add_connection(struct v4l2_async_notifier *notifier,
{ {
mutex_lock(&list_lock); mutex_lock(&list_lock);
list_add_tail(&asc->asc_entry, &notifier->asc_list); list_add_tail(&asc->asc_entry, &notifier->waiting_list);
mutex_unlock(&list_lock); mutex_unlock(&list_lock);
@ -810,10 +814,12 @@ err_unbind:
*/ */
subdev_notifier = v4l2_async_find_subdev_notifier(sd); subdev_notifier = v4l2_async_find_subdev_notifier(sd);
if (subdev_notifier) if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier, false); v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
if (sd->asd) if (sd->asd) {
v4l2_async_nf_call_unbind(notifier, sd, sd->asd); v4l2_async_nf_call_unbind(notifier, sd, sd->asd);
sd->asd->sd = NULL;
}
v4l2_async_cleanup(sd); v4l2_async_cleanup(sd);
mutex_unlock(&list_lock); mutex_unlock(&list_lock);
@ -839,9 +845,9 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
if (sd->asd) { if (sd->asd) {
struct v4l2_async_notifier *notifier = sd->notifier; struct v4l2_async_notifier *notifier = sd->notifier;
list_add(&sd->asd->waiting_entry, &notifier->waiting_list); list_move(&sd->asd->asc_entry, &notifier->waiting_list);
v4l2_async_nf_call_unbind(notifier, sd, sd->asd); v4l2_async_nf_call_unbind(notifier, sd, sd->asd);
sd->asd->sd = NULL;
} }
v4l2_async_cleanup(sd); v4l2_async_cleanup(sd);
@ -895,7 +901,7 @@ static int pending_subdevs_show(struct seq_file *s, void *data)
list_for_each_entry(notif, &notifier_list, notifier_entry) { list_for_each_entry(notif, &notifier_list, notifier_entry) {
seq_printf(s, "%s:\n", v4l2_async_nf_name(notif)); seq_printf(s, "%s:\n", v4l2_async_nf_name(notif));
list_for_each_entry(asc, &notif->waiting_list, waiting_entry) list_for_each_entry(asc, &notif->waiting_list, asc_entry)
print_waiting_match(s, &asc->match); print_waiting_match(s, &asc->match);
} }

2
drivers/staging/media/imx/imx-media-dev-common.c
View File

@ -384,7 +384,7 @@ int imx_media_dev_notifier_register(struct imx_media_dev *imxmd,
int ret; int ret;
/* no subdevs? just bail */ /* no subdevs? just bail */
if (list_empty(&imxmd->notifier.asc_list)) { if (list_empty(&imxmd->notifier.waiting_list)) {
v4l2_err(&imxmd->v4l2_dev, "no subdevs\n"); v4l2_err(&imxmd->v4l2_dev, "no subdevs\n");
return -ENODEV; return -ENODEV;
} }

6
drivers/staging/media/tegra-video/vi.c
View File

@ -1464,7 +1464,7 @@ tegra_vi_graph_find_entity(struct tegra_vi_channel *chan,
struct tegra_vi_graph_entity *entity; struct tegra_vi_graph_entity *entity;
struct v4l2_async_connection *asd; struct v4l2_async_connection *asd;
list_for_each_entry(asd, &chan->notifier.asc_list, asc_entry) { list_for_each_entry(asd, &chan->notifier.done_list, asc_entry) {
entity = to_tegra_vi_graph_entity(asd); entity = to_tegra_vi_graph_entity(asd);
if (entity->asd.match.fwnode == fwnode) if (entity->asd.match.fwnode == fwnode)
return entity; return entity;
@ -1608,7 +1608,7 @@ static int tegra_vi_graph_notify_complete(struct v4l2_async_notifier *notifier)
} }
/* create links between the entities */ /* create links between the entities */
list_for_each_entry(asd, &chan->notifier.asc_list, asc_entry) { list_for_each_entry(asd, &chan->notifier.done_list, asc_entry) {
entity = to_tegra_vi_graph_entity(asd); entity = to_tegra_vi_graph_entity(asd);
ret = tegra_vi_graph_build(chan, entity); ret = tegra_vi_graph_build(chan, entity);
if (ret < 0) if (ret < 0)
@ -1775,7 +1775,7 @@ static int tegra_vi_graph_init(struct tegra_vi *vi)
ret = tegra_vi_graph_parse_one(chan, remote); ret = tegra_vi_graph_parse_one(chan, remote);
fwnode_handle_put(remote); fwnode_handle_put(remote);
if (ret < 0 || list_empty(&chan->notifier.asc_list)) if (ret < 0 || list_empty(&chan->notifier.waiting_list))
continue; continue;
chan->notifier.ops = &tegra_vi_async_ops; chan->notifier.ops = &tegra_vi_async_ops;

9
include/media/v4l2-async.h
View File

@ -66,9 +66,8 @@ struct v4l2_async_match_desc {
* *
* @match: struct of match type and per-bus type matching data sets * @match: struct of match type and per-bus type matching data sets
* @asc_entry: used to add struct v4l2_async_connection objects to the * @asc_entry: used to add struct v4l2_async_connection objects to the
* master notifier @asc_list * notifier @waiting_list or @done_list
* @waiting_entry: used to link struct v4l2_async_connection objects, waiting to * @sd: the related sub-device
* be probed, to a notifier->waiting_list list
* *
* When this struct is used as a member in a driver specific struct, * When this struct is used as a member in a driver specific struct,
* the driver specific struct shall contain the &struct * the driver specific struct shall contain the &struct
@ -77,7 +76,7 @@ struct v4l2_async_match_desc {
struct v4l2_async_connection { struct v4l2_async_connection {
struct v4l2_async_match_desc match; struct v4l2_async_match_desc match;
struct list_head asc_entry; struct list_head asc_entry;
struct list_head waiting_entry; struct v4l2_subdev *sd;
}; };
/** /**
@ -106,7 +105,6 @@ struct v4l2_async_notifier_operations {
* @v4l2_dev: v4l2_device of the root notifier, NULL otherwise * @v4l2_dev: v4l2_device of the root notifier, NULL otherwise
* @sd: sub-device that registered the notifier, NULL otherwise * @sd: sub-device that registered the notifier, NULL otherwise
* @parent: parent notifier * @parent: parent notifier
* @asc_list: master list of struct v4l2_async_connection
* @waiting_list: list of struct v4l2_async_connection, waiting for their * @waiting_list: list of struct v4l2_async_connection, waiting for their
* drivers * drivers
* @done_list: list of struct v4l2_subdev, already probed * @done_list: list of struct v4l2_subdev, already probed
@ -117,7 +115,6 @@ struct v4l2_async_notifier {
struct v4l2_device *v4l2_dev; struct v4l2_device *v4l2_dev;
struct v4l2_subdev *sd; struct v4l2_subdev *sd;
struct v4l2_async_notifier *parent; struct v4l2_async_notifier *parent;
struct list_head asc_list;
struct list_head waiting_list; struct list_head waiting_list;
struct list_head done_list; struct list_head done_list;
struct list_head notifier_entry; struct list_head notifier_entry;