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| author | Thierry Reding <treding@nvidia.com> | 2018-11-28 10:54:10 +0100 |
|---|---|---|
| committer | Jassi Brar <jaswinder.singh@linaro.org> | 2018-12-21 22:31:26 -0600 |
| commit | a8803d7421cc2be2ac12a8155e5d824f04259eff (patch) | |
| tree | 76495c4a0e449dfaedfc1dc39b65f39ec8a33f67 /include | |
| parent | 2298a6f09f455f64bf253e6fb5c1ff72f38a6249 (diff) | |
| download | linux-stable-a8803d7421cc2be2ac12a8155e5d824f04259eff.tar.gz linux-stable-a8803d7421cc2be2ac12a8155e5d824f04259eff.tar.bz2 linux-stable-a8803d7421cc2be2ac12a8155e5d824f04259eff.zip | |
mailbox: Support blocking transfers in atomic context
The mailbox framework supports blocking transfers via completions for
clients that can sleep. In order to support blocking transfers in cases
where the transmission is not permitted to sleep, add a new ->flush()
callback that controller drivers can implement to busy loop until the
transmission has been completed. A new mbox_flush() function can be
called by mailbox consumers in atomic context to make sure a transfer
has completed.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mailbox_client.h | 1 | ||||
| -rw-r--r-- | include/linux/mailbox_controller.h | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/mailbox_client.h b/include/linux/mailbox_client.h index 44348710953f..faa7da3c9c8b 100644 --- a/include/linux/mailbox_client.h +++ b/include/linux/mailbox_client.h @@ -44,6 +44,7 @@ struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl, const char *name); struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index); int mbox_send_message(struct mbox_chan *chan, void *mssg); +int mbox_flush(struct mbox_chan *chan, unsigned long timeout); 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 */ diff --git a/include/linux/mailbox_controller.h b/include/linux/mailbox_controller.h index 9b0b21207345..4994a438444c 100644 --- a/include/linux/mailbox_controller.h +++ b/include/linux/mailbox_controller.h @@ -24,6 +24,9 @@ struct mbox_chan; * transmission of data is reported by the controller via * mbox_chan_txdone (if it has some TX ACK irq). It must not * sleep. + * @flush: Called when a client requests transmissions to be blocking but + * the context doesn't allow sleeping. Typically the controller + * will implement a busy loop waiting for the data to flush out. * @startup: Called when a client requests the chan. The controller * could ask clients for additional parameters of communication * to be provided via client's chan_data. This call may @@ -46,6 +49,7 @@ struct mbox_chan; */ struct mbox_chan_ops { int (*send_data)(struct mbox_chan *chan, void *data); + int (*flush)(struct mbox_chan *chan, unsigned long timeout); int (*startup)(struct mbox_chan *chan); void (*shutdown)(struct mbox_chan *chan); bool (*last_tx_done)(struct mbox_chan *chan); |