| Message ID | 1603787977-6975-1-git-send-email-loic.poulain@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v7,1/2] bus: mhi: Add mhi_queue_is_full function | expand |
On Tue, Oct 27, 2020 at 4:33 AM Loic Poulain <loic.poulain@linaro.org> wrote: > > This function can be used by client driver to determine whether it's > possible to queue new elements in a channel ring. > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > --- > v1->v5: not part of the series > v6: Add this commit, used for stopping TX queue > v7: no change > > drivers/bus/mhi/core/main.c | 15 +++++++++++++-- > include/linux/mhi.h | 7 +++++++ > 2 files changed, 20 insertions(+), 2 deletions(-) > > diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c > index a588eac..44aa11f 100644 > --- a/drivers/bus/mhi/core/main.c > +++ b/drivers/bus/mhi/core/main.c > @@ -943,8 +943,8 @@ void mhi_ctrl_ev_task(unsigned long data) > } > } > > -static bool mhi_is_ring_full(struct mhi_controller *mhi_cntrl, > - struct mhi_ring *ring) > +static inline bool mhi_is_ring_full(struct mhi_controller *mhi_cntrl, > + struct mhi_ring *ring) The compiler can decide whether to inline or not. > { > void *tmp = ring->wp + ring->el_size; > > @@ -1173,6 +1173,17 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, > } > EXPORT_SYM
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index a588eac..44aa11f 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -943,8 +943,8 @@ void mhi_ctrl_ev_task(unsigned long data) } } -static bool mhi_is_ring_full(struct mhi_controller *mhi_cntrl, - struct mhi_ring *ring) +static inline bool mhi_is_ring_full(struct mhi_controller *mhi_cntrl, + struct mhi_ring *ring) { void *tmp = ring->wp + ring->el_size; @@ -1173,6 +1173,17 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, } EXPORT_SYMBOL_GPL(mhi_queue_buf); +bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir) +{ + struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; + struct mhi_chan *mhi_chan = (dir == DMA_TO_DEVICE) ? + mhi_dev->ul_chan : mhi_dev->dl_chan; + struct mhi_ring *tre_ring = &mhi_chan->tre_ring; + + return mhi_is_ring_full(mhi_cntrl, tre_ring); +} +EXPORT_SYMBOL_GPL(mhi_queue_is_full); + int mhi_send_cmd(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, enum mhi_cmd_type cmd) diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 9d67e75..f72c3a4 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -745,4 +745,11 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, struct sk_buff *skb, size_t len, enum mhi_flags mflags); +/** + * mhi_queue_is_full - Determine whether queueing new elements is possible + * @mhi_dev: Device associated with the channels + * @dir: DMA direction for the channel + */ +bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir); + #endif /* _MHI_H_ */
This function can be used by client driver to determine whether it's possible to queue new elements in a channel ring. Signed-off-by: Loic Poulain <loic.poulain@linaro.org> --- v1->v5: not part of the series v6: Add this commit, used for stopping TX queue v7: no change drivers/bus/mhi/core/main.c | 15 +++++++++++++-- include/linux/mhi.h | 7 +++++++ 2 files changed, 20 insertions(+), 2 deletions(-)