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bus: mhi: core: Add an API for auto queueing buffers for DL channel 

Add a new API "mhi_prepare_for_transfer_autoqueue" for using with client
drivers like QRTR to request MHI core to autoqueue buffers for the DL
channel along with starting both UL and DL channels.

So far, the "auto_queue" flag specified by the controller drivers in
channel definition served this purpose but this will be removed at some
point in future.

Cc: netdev@vger.kernel.org
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Co-developed-by: Loic Poulain <loic.poulain@linaro.org>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20211216081227.237749-9-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manivannan Sadhasivam 2021-12-16 13:42:25 +05:30 committed by Greg Kroah-Hartman
parent d651ce8e91
commit 227fee5fc9
4 changed files with 39 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/bus/mhi/core/internal.h
View File

@ -682,8 +682,12 @@ void mhi_deinit_free_irq(struct mhi_controller *mhi_cntrl);
void mhi_rddm_prepare(struct mhi_controller *mhi_cntrl,
struct image_info *img_info);
void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl);
/* Automatically allocate and queue inbound buffers */
#define MHI_CH_INBOUND_ALLOC_BUFS BIT(0)
int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
struct mhi_chan *mhi_chan);
struct mhi_chan *mhi_chan, unsigned int 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,

21
drivers/bus/mhi/core/main.c
View File

@ -1430,7 +1430,7 @@ exit_unprepare_channel:
}
int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
struct mhi_chan *mhi_chan)
struct mhi_chan *mhi_chan, unsigned int flags)
{
int ret = 0;
struct device *dev = &mhi_chan->mhi_dev->dev;
@ -1455,6 +1455,9 @@ 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,
@ -1610,8 +1613,7 @@ void mhi_reset_chan(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan)
read_unlock_bh(&mhi_cntrl->pm_lock);
}
/* Move channel to start state */
int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
static int __mhi_prepare_for_transfer(struct mhi_device *mhi_dev, unsigned int flags)
{
int ret, dir;
struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
@ -1622,7 +1624,7 @@ 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;
}
@ -1640,8 +1642,19 @@ error_open_chan:
return ret;
}
int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
{
return __mhi_prepare_for_transfer(mhi_dev, 0);
}
EXPORT_SYMBOL_GPL(mhi_prepare_for_transfer);
int mhi_prepare_for_transfer_autoqueue(struct mhi_device *mhi_dev)
{
return __mhi_prepare_for_transfer(mhi_dev, MHI_CH_INBOUND_ALLOC_BUFS);
}
EXPORT_SYMBOL_GPL(mhi_prepare_for_transfer_autoqueue);
void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev)
{
struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;

21
include/linux/mhi.h
View File

@ -730,15 +730,26 @@ void mhi_device_put(struct mhi_device *mhi_dev);
/**
* mhi_prepare_for_transfer - Setup UL and DL channels for data transfer.
* Allocate and initialize the channel context and
* also issue the START channel command to both
* channels. Channels can be started only if both
* host and device execution environments match and
* channels are in a DISABLED state.
* @mhi_dev: Device associated with the channels
*
* Allocate and initialize the channel context and also issue the START channel
* command to both channels. Channels can be started only if both host and
* device execution environments match and channels are in a DISABLED state.
*/
int mhi_prepare_for_transfer(struct mhi_device *mhi_dev);
/**
* mhi_prepare_for_transfer_autoqueue - Setup UL and DL channels with auto queue
* buffers for DL traffic
* @mhi_dev: Device associated with the channels
*
* Allocate and initialize the channel context and also issue the START channel
* command to both channels. Channels can be started only if both host and
* device execution environments match and channels are in a DISABLED state.
* The MHI core will automatically allocate and queue buffers for the DL traffic.
*/
int mhi_prepare_for_transfer_autoqueue(struct mhi_device *mhi_dev);
/**
* mhi_unprepare_from_transfer - Reset UL and DL channels for data transfer.
* Issue the RESET channel command and let the

2
net/qrtr/mhi.c
View File

@ -79,7 +79,7 @@ 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_autoqueue(mhi_dev);
if (rc)
return rc;