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Commit 8a09f746 authored by Lina Iyer's avatar Lina Iyer
Browse files

drivers: mailbox: add controller debug 



Sometimes a client may detect that a channel has clogged up and is not
responding to requests in time. In such case, the client may want to
initiate a debug on the controller that might help debug and analyze the
reasons for the clog.

Change-Id: Ib15db652e780790f0eaa4f6ada7ad9defed99a65
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
parent 3b6ca7c9

drivers/mailbox/mailbox.c

+10 −0
Original line number Diff line number Diff line
@@ -332,6 +332,16 @@ bool mbox_controller_is_idle(struct mbox_chan *chan) 
}

EXPORT_SYMBOL(mbox_controller_is_idle);





void mbox_chan_debug(struct mbox_chan *chan)

{

	if (!chan || !chan->cl || !chan->mbox->debug)

		return;



	return chan->mbox->debug(chan);

}

EXPORT_SYMBOL(mbox_chan_debug);



/**

 * mbox_request_channel - Request a mailbox channel.

 * @cl: Identity of the client requesting the channel.

include/linux/mailbox_client.h

+1 −0
Original line number Diff line number Diff line
@@ -49,5 +49,6 @@ void mbox_client_txdone(struct mbox_chan *chan, int r); /* atomic */ 
bool mbox_client_peek_data(struct mbox_chan *chan); /* atomic */

void mbox_free_channel(struct mbox_chan *chan); /* may sleep */

bool mbox_controller_is_idle(struct mbox_chan *chan); /* atomic */

void mbox_chan_debug(struct mbox_chan *chan);



#endif /* __MAILBOX_CLIENT_H */

include/linux/mailbox_controller.h

+3 −0
Original line number Diff line number Diff line
@@ -49,6 +49,8 @@ struct mbox_chan; 
 *		  Used only if txdone_poll:=true && txdone_irq:=false

 * @peek_data: Atomic check for any received data. Return true if controller

 *		  has some data to push to the client. False otherwise.

 * @debug:	Allow chan to be debugged when the client detects a channel is

 *		locked up.

 */

struct mbox_chan_ops {

	int (*send_data)(struct mbox_chan *chan, void *data);
@@ -90,6 +92,7 @@ struct mbox_controller { 
	struct mbox_chan *(*of_xlate)(struct mbox_controller *mbox,

				      const struct of_phandle_args *sp);

	bool (*is_idle)(struct mbox_controller *mbox);

	void (*debug)(struct mbox_chan *chan);

	/* Internal to API */

	struct hrtimer poll_hrt;

	struct list_head node;