Hi Hans,
On Mon, Nov 17, 2014 at 10:02:03AM +0100, Hans Verkuil wrote:
> On 11/15/2014 10:10 PM, Sakari Ailus wrote:
> > Hi Hans,
> >
> > A few comments below.
> >
> > On Sun, Sep 21, 2014 at 04:48:25PM +0200, Hans Verkuil wrote:
> >> From: Hans Verkuil <hans.verk...@cisco.com>
> >>
> >> Sometimes you want to apply a value every time v4l2_ctrl_apply_store
> >> is called, and sometimes you want to apply that value only once.
> >>
> >> This adds support for that feature.
> >>
> >> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
> >> ---
> >> drivers/media/v4l2-core/v4l2-ctrls.c | 75
> >> ++++++++++++++++++++++++++++--------
> >> drivers/media/v4l2-core/v4l2-ioctl.c | 14 +++----
> >> include/media/v4l2-ctrls.h | 12 ++++++
> >> 3 files changed, 79 insertions(+), 22 deletions(-)
> >>
> >> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c
> >> b/drivers/media/v4l2-core/v4l2-ctrls.c
> >> index e5dccf2..21560b0 100644
> >> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> >> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> >> @@ -1475,6 +1475,7 @@ static int ptr_to_user(struct v4l2_ext_control *c,
> >> static int cur_to_user(struct v4l2_ext_control *c,
> >> struct v4l2_ctrl *ctrl)
> >> {
> >> + c->flags = 0;
> >> return ptr_to_user(c, ctrl, ctrl->p_cur);
> >> }
> >>
> >> @@ -1482,8 +1483,13 @@ static int cur_to_user(struct v4l2_ext_control *c,
> >> static int store_to_user(struct v4l2_ext_control *c,
> >> struct v4l2_ctrl *ctrl, unsigned store)
> >> {
> >> + c->flags = 0;
> >> if (store == 0)
> >> return ptr_to_user(c, ctrl, ctrl->p_new);
> >> + if (test_bit(store - 1, ctrl->cluster[0]->ignore_store_after_use))
> >> + c->flags |= V4L2_EXT_CTRL_FL_IGN_STORE_AFTER_USE;
> >> + if (test_bit(store - 1, ctrl->cluster[0]->ignore_store))
> >> + c->flags |= V4L2_EXT_CTRL_FL_IGN_STORE;
> >> return ptr_to_user(c, ctrl, ctrl->p_stores[store - 1]);
> >> }
> >>
> >> @@ -1491,6 +1497,7 @@ static int store_to_user(struct v4l2_ext_control *c,
> >> static int new_to_user(struct v4l2_ext_control *c,
> >> struct v4l2_ctrl *ctrl)
> >> {
> >> + c->flags = 0;
> >> return ptr_to_user(c, ctrl, ctrl->p_new);
> >> }
> >>
> >> @@ -1546,6 +1553,8 @@ static int user_to_ptr(struct v4l2_ext_control *c,
> >> static int user_to_new(struct v4l2_ext_control *c,
> >> struct v4l2_ctrl *ctrl)
> >> {
> >> + ctrl->cluster[0]->new_ignore_store_after_use =
> >> + c->flags & V4L2_EXT_CTRL_FL_IGN_STORE_AFTER_USE;
> >> return user_to_ptr(c, ctrl, ctrl->p_new);
> >> }
> >>
> >> @@ -1597,8 +1606,11 @@ static void new_to_cur(struct v4l2_fh *fh, struct
> >> v4l2_ctrl *ctrl, u32 ch_flags)
> >> /* Helper function: copy the new control value to the store */
> >> static void new_to_store(struct v4l2_ctrl *ctrl)
> >> {
> >> + if (ctrl == NULL)
> >> + return;
> >> +
> >> /* has_changed is set by cluster_changed */
> >> - if (ctrl && ctrl->has_changed)
> >> + if (ctrl->has_changed)
> >> ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_stores[ctrl->store - 1]);
> >> }
> >>
> >> @@ -2328,6 +2340,12 @@ void v4l2_ctrl_cluster(unsigned ncontrols, struct
> >> v4l2_ctrl **controls)
> >>
> >> for (i = 0; i < ncontrols; i++) {
> >> if (controls[i]) {
> >> + /*
> >> + * All controls in a cluster must have the same
> >> + * V4L2_CTRL_FLAG_CAN_STORE flag value.
> >> + */
> >> + WARN_ON((controls[0]->flags & controls[i]->flags) &
> >> + V4L2_CTRL_FLAG_CAN_STORE);
> >> controls[i]->cluster = controls;
> >> controls[i]->ncontrols = ncontrols;
> >> if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
> >> @@ -2850,6 +2868,10 @@ static int extend_store(struct v4l2_ctrl *ctrl,
> >> unsigned stores)
> >> unsigned s, idx;
> >> union v4l2_ctrl_ptr *p;
> >>
> >> + /* round up to the next multiple of 4 */
> >> + stores = (stores + 3) & ~3;
> >
> > You said it, round_up(). :-)
> >
> > The comment becomes redundant as a result, too.
> >
> > The above may also overflow.
>
> Will fix.
I just realised round_up() will naturally also overflow, but it'll overflow
"correctly" to zero. So the upper limit check must be before this. The
change then effectually only makes the comment unnecessary.
> >
> >> + if (stores > V4L2_CTRLS_MAX_STORES)
> >> + return -EINVAL;
> >> p = kcalloc(stores, sizeof(union v4l2_ctrl_ptr), GFP_KERNEL);
> >> if (p == NULL)
> >> return -ENOMEM;
> >> @@ -2868,6 +2890,7 @@ static int extend_store(struct v4l2_ctrl *ctrl,
> >> unsigned stores)
> >> memcpy(p, ctrl->p_stores, ctrl->nr_of_stores * sizeof(union
> >> v4l2_ctrl_ptr));
> >> kfree(ctrl->p_stores);
> >> ctrl->p_stores = p;
> >> + bitmap_set(ctrl->ignore_store, ctrl->nr_of_stores, stores -
> >> ctrl->nr_of_stores);
> >> ctrl->nr_of_stores = stores;
> >> return 0;
> >> }
> >> @@ -3081,21 +3104,33 @@ static int try_or_set_cluster(struct v4l2_fh *fh,
> >> struct v4l2_ctrl *master,
> >>
> >> ret = call_op(master, try_ctrl);
> >>
> >> - /* Don't set if there is no change */
> >> - if (ret || !set || !cluster_changed(master))
> >> - return ret;
> >> - ret = call_op(master, s_ctrl);
> >> - if (ret)
> >> + if (ret || !set)
> >> return ret;
> >>
> >> - /* If OK, then make the new values permanent. */
> >> - update_flag = is_cur_manual(master) != is_new_manual(master);
> >> - for (i = 0; i < master->ncontrols; i++) {
> >> - if (store)
> >> - new_to_store(master->cluster[i]);
> >> + /* Don't set if there is no change */
> >> + if (cluster_changed(master)) {
> >> + ret = call_op(master, s_ctrl);
> >> + if (ret)
> >> + return ret;
> >> +
> >> + /* If OK, then make the new values permanent. */
> >> + update_flag = is_cur_manual(master) != is_new_manual(master);
> >> + for (i = 0; i < master->ncontrols; i++) {
> >> + if (store)
> >> + new_to_store(master->cluster[i]);
> >> + else
> >> + new_to_cur(fh, master->cluster[i], ch_flags |
> >> + ((update_flag && i > 0) ?
> >> + V4L2_EVENT_CTRL_CH_FLAGS : 0));
> >> + }
> >> + }
> >> +
> >> + if (store) {
> >> + if (master->new_ignore_store_after_use)
> >> + set_bit(store - 1, master->ignore_store_after_use);
> >> else
> >> - new_to_cur(fh, master->cluster[i], ch_flags |
> >> - ((update_flag && i > 0) ?
> >> V4L2_EVENT_CTRL_CH_FLAGS : 0));
> >> + clear_bit(store - 1, master->ignore_store_after_use);
> >> + clear_bit(store - 1, master->ignore_store);
> >
> > How about allowing the user to forget a control in store as well?
>
> Yeah, that's one thing I need to add. I need to think about this some more
> how this
> can be done cleanly.
Ack.
> >
> >> }
> >> return 0;
> >> }
> >> @@ -3401,8 +3436,18 @@ int v4l2_ctrl_apply_store(struct v4l2_ctrl_handler
> >> *hdl, unsigned store)
> >> continue;
> >> if (master->handler != hdl)
> >> v4l2_ctrl_lock(master);
> >> - for (i = 0; i < master->ncontrols; i++)
> >> - store_to_new(master->cluster[i], store);
> >> + for (i = 0; i < master->ncontrols; i++) {
> >> + struct v4l2_ctrl *ctrl = master->cluster[i];
> >> +
> >> + if (!ctrl || (store && test_bit(store - 1,
> >> master->ignore_store)))
> >> + continue;
> >> + store_to_new(ctrl, store);
> >> + }
> >> +
> >> + if (store && !test_bit(store - 1, master->ignore_store)) {
> >> + if (test_bit(store - 1, master->ignore_store_after_use))
> >
> > How about:
> >
> > if (store && test_bit() && test_bit())
>
> OK.
>
> >
> >> + set_bit(store - 1, master->ignore_store);
> >> + }
> >>
> >> /* For volatile autoclusters that are currently in auto mode
> >> we need to discover if it will be set to manual mode.
> >> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c
> >> b/drivers/media/v4l2-core/v4l2-ioctl.c
> >> index 628852c..9d3b4f2 100644
> >> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> >> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> >> @@ -562,12 +562,14 @@ static void v4l_print_ext_controls(const void *arg,
> >> bool write_only)
> >> pr_cont("class=0x%x, count=%d, error_idx=%d",
> >> p->ctrl_class, p->count, p->error_idx);
> >> for (i = 0; i < p->count; i++) {
> >> - if (p->controls[i].size)
> >> - pr_cont(", id/val=0x%x/0x%x",
> >> - p->controls[i].id, p->controls[i].value);
> >> + if (!p->controls[i].size)
> >> + pr_cont(", id/flags/val=0x%x/0x%x/0x%x",
> >> + p->controls[i].id, p->controls[i].flags,
> >> + p->controls[i].value);
> >> else
> >> - pr_cont(", id/size=0x%x/%u",
> >> - p->controls[i].id, p->controls[i].size);
> >> + pr_cont(", id/flags/size=0x%x/0x%x/%u",
> >> + p->controls[i].id, p->controls[i].flags,
> >> + p->controls[i].size);
> >> }
> >> pr_cont("\n");
> >> }
> >> @@ -888,8 +890,6 @@ static int check_ext_ctrls(struct v4l2_ext_controls
> >> *c, int allow_priv)
> >>
> >> /* zero the reserved fields */
> >> c->reserved[0] = c->reserved[1] = 0;
> >> - for (i = 0; i < c->count; i++)
> >> - c->controls[i].reserved2[0] = 0;
> >>
> >> /* V4L2_CID_PRIVATE_BASE cannot be used as control class
> >> when using extended controls.
> >> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> >> index 713980a..3005d88 100644
> >> --- a/include/media/v4l2-ctrls.h
> >> +++ b/include/media/v4l2-ctrls.h
> >> @@ -36,6 +36,9 @@ struct v4l2_subscribed_event;
> >> struct v4l2_fh;
> >> struct poll_table_struct;
> >>
> >> +/* Must be a multiple of 4 */
> >> +#define V4L2_CTRLS_MAX_STORES VIDEO_MAX_FRAME
> >> +
> >> /** union v4l2_ctrl_ptr - A pointer to a control value.
> >> * @p_s32: Pointer to a 32-bit signed value.
> >> * @p_s64: Pointer to a 64-bit signed value.
> >> @@ -123,6 +126,8 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl
> >> *ctrl, void *priv);
> >> * @call_notify: If set, then call the handler's notify function
> >> whenever the
> >> * control's value changes.
> >> * @can_store: If set, then this control supports configuration stores.
> >> + * @new_ignore_store_after_use: If set, then the new control had the
> >> + * V4L2_EXT_CTRL_FL_IGN_STORE_AFTER_USE flag set.
> >> * @manual_mode_value: If the is_auto flag is set, then this is the value
> >> * of the auto control that determines if that control is
> >> in
> >> * manual mode. So if the value of the auto control equals
> >> this
> >> @@ -143,6 +148,10 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl
> >> *ctrl, void *priv);
> >> * @nr_of_dims:The number of dimensions in @dims.
> >> * @nr_of_stores: The number of allocated configuration stores of this
> >> control.
> >> * @store: The configuration store that the control op operates on.
> >> + * @ignore_store: If the bit for the corresponding store is 1, then
> >> don't apply that
> >> + * store's value.
> >> + * @ignore_store_after_use: If the bit for the corresponding store is 1,
> >> then set the
> >> + * bit in @ignore_store after the store's value has been
> >> applied.
> >> * @menu_skip_mask: The control's skip mask for menu controls. This
> >> makes it
> >> * easy to skip menu items that are not valid. If bit X is
> >> set,
> >> * then menu item X is skipped. Of course, this only works
> >> for
> >> @@ -183,6 +192,7 @@ struct v4l2_ctrl {
> >> unsigned int has_volatiles:1;
> >> unsigned int call_notify:1;
> >> unsigned int can_store:1;
> >> + unsigned int new_ignore_store_after_use:1;
> >> unsigned int manual_mode_value:8;
> >>
> >> const struct v4l2_ctrl_ops *ops;
> >> @@ -197,6 +207,8 @@ struct v4l2_ctrl {
> >> u32 nr_of_dims;
> >> u16 nr_of_stores;
> >> u16 store;
> >> + DECLARE_BITMAP(ignore_store, V4L2_CTRLS_MAX_STORES);
> >> + DECLARE_BITMAP(ignore_store_after_use, V4L2_CTRLS_MAX_STORES);
> >
> > I'd store this information next to the value itself. The reason is that
> > stores are typically accessed one at a time, and thus keeping data related
> > to a single store in a single contiguous location reduces cache misses.
>
> Hmm, sounds like overengineering to me. If I can do that without sacrificing
> readability, then I can more it around. It's likely that these datastructures
> will change anyway.
The controls are accessed very often in practice so this kind of things
count. There's already a lot of code which gets executed in order to set a
single control that's relevant only in some cases, such as clusters.
I think it'd probably be more readable as well if information related to a
store was located in a single place. As a bonus you wouldn't need to set a
global maximum for the number of stores one may have.
--
Kind regards,
Sakari Ailus
e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk
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