diff mbox series

[net-next,1/3] bus: mhi: core: Add helper API to return number of free TREs

Message ID 1610388462-16322-1-git-send-email-loic.poulain@linaro.org
State New
Headers show
Series [net-next,1/3] bus: mhi: core: Add helper API to return number of free TREs | expand

Commit Message

Loic Poulain Jan. 11, 2021, 6:07 p.m. UTC
From: Hemant Kumar <hemantk@codeaurora.org>

Introduce mhi_get_free_desc_count() API to return number
of TREs available to queue buffer. MHI clients can use this
API to know before hand if ring is full without calling queue
API.

Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/main.c | 12 ++++++++++++
 include/linux/mhi.h         |  9 +++++++++
 2 files changed, 21 insertions(+)

Comments

Jakub Kicinski Jan. 14, 2021, 3:33 a.m. UTC | #1
On Mon, 11 Jan 2021 19:07:40 +0100 Loic Poulain wrote:
> From: Hemant Kumar <hemantk@codeaurora.org>
> 
> Introduce mhi_get_free_desc_count() API to return number
> of TREs available to queue buffer. MHI clients can use this
> API to know before hand if ring is full without calling queue
> API.
> 
> Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
> Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Can we apply these to net-next or does it need to be on a stable branch
that will also get pulled into mhi-next?
Manivannan Sadhasivam Jan. 14, 2021, 3:57 a.m. UTC | #2
On Wed, Jan 13, 2021 at 07:33:01PM -0800, Jakub Kicinski wrote:
> On Mon, 11 Jan 2021 19:07:40 +0100 Loic Poulain wrote:
> > From: Hemant Kumar <hemantk@codeaurora.org>
> > 
> > Introduce mhi_get_free_desc_count() API to return number
> > of TREs available to queue buffer. MHI clients can use this
> > API to know before hand if ring is full without calling queue
> > API.
> > 
> > Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
> > Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> 
> Can we apply these to net-next or does it need to be on a stable branch
> that will also get pulled into mhi-next?

We should use the immutable branch for this so that I can pull into
mhi-next.

Thanks,
Mani
Jakub Kicinski Jan. 14, 2021, 4:02 a.m. UTC | #3
On Thu, 14 Jan 2021 09:27:49 +0530 Manivannan Sadhasivam wrote:
> On Wed, Jan 13, 2021 at 07:33:01PM -0800, Jakub Kicinski wrote:

> > On Mon, 11 Jan 2021 19:07:40 +0100 Loic Poulain wrote:  

> > > From: Hemant Kumar <hemantk@codeaurora.org>

> > > 

> > > Introduce mhi_get_free_desc_count() API to return number

> > > of TREs available to queue buffer. MHI clients can use this

> > > API to know before hand if ring is full without calling queue

> > > API.

> > > 

> > > Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

> > > Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>

> > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>  

> > 

> > Can we apply these to net-next or does it need to be on a stable branch

> > that will also get pulled into mhi-next?  

> 

> We should use the immutable branch for this so that I can pull into

> mhi-next.


Thanks for a quire reply!

Loic, FWIW git merge-base is your friend.
Manivannan Sadhasivam Jan. 27, 2021, 11:23 a.m. UTC | #4
On Wed, Jan 13, 2021 at 08:02:46PM -0800, Jakub Kicinski wrote:
> On Thu, 14 Jan 2021 09:27:49 +0530 Manivannan Sadhasivam wrote:

> > On Wed, Jan 13, 2021 at 07:33:01PM -0800, Jakub Kicinski wrote:

> > > On Mon, 11 Jan 2021 19:07:40 +0100 Loic Poulain wrote:  

> > > > From: Hemant Kumar <hemantk@codeaurora.org>

> > > > 

> > > > Introduce mhi_get_free_desc_count() API to return number

> > > > of TREs available to queue buffer. MHI clients can use this

> > > > API to know before hand if ring is full without calling queue

> > > > API.

> > > > 

> > > > Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

> > > > Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>

> > > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>  

> > > 

> > > Can we apply these to net-next or does it need to be on a stable branch

> > > that will also get pulled into mhi-next?  

> > 

> > We should use the immutable branch for this so that I can pull into

> > mhi-next.

> 


Please find the immutable branch:
https://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi.git/log/?h=mhi-net-immutable

I've now merged this into mhi-next!

Thanks,
Mani

> Thanks for a quire reply!

> 

> Loic, FWIW git merge-base is your friend.
Jakub Kicinski Jan. 27, 2021, 9:05 p.m. UTC | #5
On Wed, 27 Jan 2021 16:53:17 +0530 Manivannan Sadhasivam wrote:
> On Wed, Jan 13, 2021 at 08:02:46PM -0800, Jakub Kicinski wrote:

> > On Thu, 14 Jan 2021 09:27:49 +0530 Manivannan Sadhasivam wrote:  

> > > On Wed, Jan 13, 2021 at 07:33:01PM -0800, Jakub Kicinski wrote:  

> > > > On Mon, 11 Jan 2021 19:07:40 +0100 Loic Poulain wrote:    

> > > > > From: Hemant Kumar <hemantk@codeaurora.org>

> > > > > 

> > > > > Introduce mhi_get_free_desc_count() API to return number

> > > > > of TREs available to queue buffer. MHI clients can use this

> > > > > API to know before hand if ring is full without calling queue

> > > > > API.

> > > > > 

> > > > > Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

> > > > > Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>

> > > > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>    

> > > > 

> > > > Can we apply these to net-next or does it need to be on a stable branch

> > > > that will also get pulled into mhi-next?    

> > > 

> > > We should use the immutable branch for this so that I can pull into

> > > mhi-next.  

> >   

> 

> Please find the immutable branch:

> https://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi.git/log/?h=mhi-net-immutable

> 

> I've now merged this into mhi-next!


Loic, please prepare a proper pull request based on that with the other
patches included.
diff mbox series

Patch

diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 3db1108..4e31f4f 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -309,6 +309,18 @@  int mhi_destroy_device(struct device *dev, void *data)
 	return 0;
 }
 
+int mhi_get_free_desc_count(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 get_nr_avail_ring_elements(mhi_cntrl, tre_ring);
+}
+EXPORT_SYMBOL_GPL(mhi_get_free_desc_count);
+
 void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason)
 {
 	struct mhi_driver *mhi_drv;
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index cd571ad..62da830 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -614,6 +614,15 @@  void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl,
 void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason);
 
 /**
+ * mhi_get_free_desc_count - Get transfer ring length
+ * Get # of TD available to queue buffers
+ * @mhi_dev: Device associated with the channels
+ * @dir: Direction of the channel
+ */
+int mhi_get_free_desc_count(struct mhi_device *mhi_dev,
+				enum dma_data_direction dir);
+
+/**
  * mhi_prepare_for_power_up - Do pre-initialization before power up.
  *                            This is optional, call this before power up if
  *                            the controller does not want bus framework to