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Date: Fri, 11 Jun 2021 09:00:16 +0200
From: Loic Poulain <loic.poulain@...aro.org>
To: Manivannan Sadhasivam <mani@...nel.org>,
Jakub Kicinski <kuba@...nel.org>,
David Miller <davem@...emloft.net>
Cc: Hemant Kumar <hemantk@...eaurora.org>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
Bhaumik Bhatt <bbhatt@...eaurora.org>,
Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] bus: mhi: Add inbound buffers allocation flag
Hi Jakub, Dave,
On Fri, 21 May 2021 at 18:35, Manivannan Sadhasivam <mani@...nel.org> wrote:
>
> + netdev, Dave, Jakub
>
> On Fri, May 21, 2021 at 03:25:19PM +0200, Loic Poulain wrote:
> > Currently, the MHI controller driver defines which channels should
> > have their inbound buffers allocated and queued. But ideally, this is
> > something that should be decided by the MHI device driver instead,
> > which actually deals with that buffers.
> >
> > Add a flag parameter to mhi_prepare_for_transfer allowing to specify
> > if buffers have to be allocated and queued by the MHI stack.
> >
> > Keep auto_queue flag for now, but should be removed at some point.
> >
> > Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
> > Tested-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> > Reviewed-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> > Reviewed-by: Hemant Kumar <hemantk@...eaurora.org>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> > v2: Update API in mhi_wwan_ctrl driver
> >
> > drivers/bus/mhi/core/internal.h | 2 +-
> > drivers/bus/mhi/core/main.c | 11 ++++++++---
> > drivers/net/mhi/net.c | 2 +-
> > drivers/net/wwan/mhi_wwan_ctrl.c | 2 +-
>
> Since this patch touches the drivers under net/, I need an Ack from Dave or
> Jakub to take it via MHI tree.
Could you please ack|nack this patch?
Thanks,
Loic
>
> > include/linux/mhi.h | 12 +++++++++++-
> > net/qrtr/mhi.c | 2 +-
> > 6 files changed, 23 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
> > index 5b9ea66..672052f 100644
> > --- a/drivers/bus/mhi/core/internal.h
> > +++ b/drivers/bus/mhi/core/internal.h
> > @@ -682,7 +682,7 @@ void mhi_rddm_prepare(struct mhi_controller *mhi_cntrl,
> > struct image_info *img_info);
> > void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl);
> > int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
> > - struct mhi_chan *mhi_chan);
> > + struct mhi_chan *mhi_chan, enum mhi_chan_flags flags);
> > int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,
> > struct mhi_chan *mhi_chan);
> > void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
> > diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> > index 0f1febf..432b53b 100644
> > --- a/drivers/bus/mhi/core/main.c
> > +++ b/drivers/bus/mhi/core/main.c
> > @@ -1384,7 +1384,8 @@ static void mhi_unprepare_channel(struct mhi_controller *mhi_cntrl,
> > }
> >
> > int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
> > - struct mhi_chan *mhi_chan)
> > + struct mhi_chan *mhi_chan,
> > + enum mhi_chan_flags flags)
> > {
> > int ret = 0;
> > struct device *dev = &mhi_chan->mhi_dev->dev;
> > @@ -1409,6 +1410,9 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
> > if (ret)
> > goto error_pm_state;
> >
> > + if (mhi_chan->dir == DMA_FROM_DEVICE)
> > + mhi_chan->pre_alloc = !!(flags & MHI_CH_INBOUND_ALLOC_BUFS);
> > +
> > /* Pre-allocate buffer for xfer ring */
> > if (mhi_chan->pre_alloc) {
> > int nr_el = get_nr_avail_ring_elements(mhi_cntrl,
> > @@ -1555,7 +1559,8 @@ void mhi_reset_chan(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan)
> > }
> >
> > /* Move channel to start state */
> > -int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
> > +int mhi_prepare_for_transfer(struct mhi_device *mhi_dev,
> > + enum mhi_chan_flags flags)
> > {
> > int ret, dir;
> > struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
> > @@ -1566,7 +1571,7 @@ int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
> > if (!mhi_chan)
> > continue;
> >
> > - ret = mhi_prepare_channel(mhi_cntrl, mhi_chan);
> > + ret = mhi_prepare_channel(mhi_cntrl, mhi_chan, flags);
> > if (ret)
> > goto error_open_chan;
> > }
> > diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c
> > index 6b5bf23..3ddfb72 100644
> > --- a/drivers/net/mhi/net.c
> > +++ b/drivers/net/mhi/net.c
> > @@ -323,7 +323,7 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
> > u64_stats_init(&mhi_netdev->stats.tx_syncp);
> >
> > /* Start MHI channels */
> > - err = mhi_prepare_for_transfer(mhi_dev);
> > + err = mhi_prepare_for_transfer(mhi_dev, 0);
> > if (err)
> > goto out_err;
> >
> > diff --git a/drivers/net/wwan/mhi_wwan_ctrl.c b/drivers/net/wwan/mhi_wwan_ctrl.c
> > index 3a44b22..84e75e4 100644
> > --- a/drivers/net/wwan/mhi_wwan_ctrl.c
> > +++ b/drivers/net/wwan/mhi_wwan_ctrl.c
> > @@ -110,7 +110,7 @@ static int mhi_wwan_ctrl_start(struct wwan_port *port)
> > int ret;
> >
> > /* Start mhi device's channel(s) */
> > - ret = mhi_prepare_for_transfer(mhiwwan->mhi_dev);
> > + ret = mhi_prepare_for_transfer(mhiwwan->mhi_dev, 0);
> > if (ret)
> > return ret;
> >
> > diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> > index d095fba..9372acf 100644
> > --- a/include/linux/mhi.h
> > +++ b/include/linux/mhi.h
> > @@ -60,6 +60,14 @@ enum mhi_flags {
> > };
> >
> > /**
> > + * enum mhi_chan_flags - MHI channel flags
> > + * @MHI_CH_INBOUND_ALLOC_BUFS: Automatically allocate and queue inbound buffers
> > + */
> > +enum mhi_chan_flags {
> > + MHI_CH_INBOUND_ALLOC_BUFS = BIT(0),
> > +};
> > +
> > +/**
> > * enum mhi_device_type - Device types
> > * @MHI_DEVICE_XFER: Handles data transfer
> > * @MHI_DEVICE_CONTROLLER: Control device
> > @@ -719,8 +727,10 @@ void mhi_device_put(struct mhi_device *mhi_dev);
> > * host and device execution environments match and
> > * channels are in a DISABLED state.
> > * @mhi_dev: Device associated with the channels
> > + * @flags: MHI channel flags
> > */
> > -int mhi_prepare_for_transfer(struct mhi_device *mhi_dev);
> > +int mhi_prepare_for_transfer(struct mhi_device *mhi_dev,
> > + enum mhi_chan_flags flags);
> >
> > /**
> > * mhi_unprepare_from_transfer - Reset UL and DL channels for data transfer.
> > diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
> > index 2bf2b19..47afded 100644
> > --- a/net/qrtr/mhi.c
> > +++ b/net/qrtr/mhi.c
> > @@ -77,7 +77,7 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
> > int rc;
> >
> > /* start channels */
> > - rc = mhi_prepare_for_transfer(mhi_dev);
> > + rc = mhi_prepare_for_transfer(mhi_dev, MHI_CH_INBOUND_ALLOC_BUFS);
> > if (rc)
> > return rc;
> >
> > --
> > 2.7.4
> >
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