Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Peng Fan <peng.fan@nxp.com>
To:     Mathieu Poirier <mathieu.poirier@linaro.org>
CC:     "ohad@wizery.com" <ohad@wizery.com>,
        "bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
        "o.rempel@pengutronix.de" <o.rempel@pengutronix.de>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "shawnguo@kernel.org" <shawnguo@kernel.org>,
        "s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
        "kernel@pengutronix.de" <kernel@pengutronix.de>,
        "festevam@gmail.com" <festevam@gmail.com>,
        dl-linux-imx <linux-imx@nxp.com>,
        "linux-remoteproc@vger.kernel.org" <linux-remoteproc@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "paul@crapouillou.net" <paul@crapouillou.net>,
        "matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
        "agross@kernel.org" <agross@kernel.org>,
        "patrice.chotard@st.com" <patrice.chotard@st.com>
Subject: RE: [PATCH V6 10/10] remoteproc: imx_proc: enable virtio/mailbox
Thread-Topic: [PATCH V6 10/10] remoteproc: imx_proc: enable virtio/mailbox
Thread-Index: AQHW6MhSdM6SRHZ3V0CV31S4IlirBKonqPYAgABh70A=
Date:   Fri, 15 Jan 2021 03:27:10 +0000
Message-ID: <DB6PR0402MB27601A971ED31EB174B2BBA388A70@DB6PR0402MB2760.eurprd04.prod.outlook.com>
References: <1610444359-1857-1-git-send-email-peng.fan@nxp.com>
 <1610444359-1857-11-git-send-email-peng.fan@nxp.com>
 <20210114213606.GD255481@xps15>
In-Reply-To: <20210114213606.GD255481@xps15>
Accept-Language: en-US
Content-Language: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: 0049d9d3-6a9d-4ffe-4caf-08d8b9057176
X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Jan 2021 03:27:10.1069
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: 4DzX/B/b9ATzh/zgOp6fG81SuwyG2B02XaILS6vRwOFxT5PKXbZiaa3eQFu/P9IFjVLH3BFW94FpK6U23Zzaqw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB6618
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

> Subject: Re: [PATCH V6 10/10] remoteproc: imx_proc: enable virtio/mailbox
>=20
> On Tue, Jan 12, 2021 at 05:39:19PM +0800, peng.fan@nxp.com wrote:
> > From: Peng Fan <peng.fan@nxp.com>
> >
> > Use virtio/mailbox to build connection between Remote Proccessors and
> > Linux. Add work queue to handle incoming messages.
> >
> > Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
> > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> > ---
> >  drivers/remoteproc/imx_rproc.c | 115
> > ++++++++++++++++++++++++++++++++-
> >  1 file changed, 112 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/remoteproc/imx_rproc.c
> > b/drivers/remoteproc/imx_rproc.c index e62a53ee128e..812b077f1282
> > 100644
> > --- a/drivers/remoteproc/imx_rproc.c
> > +++ b/drivers/remoteproc/imx_rproc.c
> > @@ -7,6 +7,7 @@
> >  #include <linux/err.h>
> >  #include <linux/interrupt.h>
> >  #include <linux/kernel.h>
> > +#include <linux/mailbox_client.h>
> >  #include <linux/mfd/syscon.h>
> >  #include <linux/module.h>
> >  #include <linux/of_address.h>
> > @@ -15,6 +16,9 @@
> >  #include <linux/platform_device.h>
> >  #include <linux/regmap.h>
> >  #include <linux/remoteproc.h>
> > +#include <linux/workqueue.h>
> > +
> > +#include "remoteproc_internal.h"
> >
> >  #define IMX7D_SRC_SCR			0x0C
> >  #define IMX7D_ENABLE_M4			BIT(3)
> > @@ -86,6 +90,11 @@ struct imx_rproc {
> >  	const struct imx_rproc_dcfg	*dcfg;
> >  	struct imx_rproc_mem		mem[IMX7D_RPROC_MEM_MAX];
> >  	struct clk			*clk;
> > +	struct mbox_client		cl;
> > +	struct mbox_chan		*tx_ch;
> > +	struct mbox_chan		*rx_ch;
> > +	struct work_struct		rproc_work;
> > +	struct workqueue_struct		*workqueue;
> >  };
> >
> >  static const struct imx_rproc_att imx_rproc_att_imx8mq[] =3D { @@
> > -366,9 +375,33 @@ static int imx_rproc_parse_fw(struct rproc *rproc,
> const struct firmware *fw)
> >  	return 0;
> >  }
> >
> > +static void imx_rproc_kick(struct rproc *rproc, int vqid) {
> > +	struct imx_rproc *priv =3D rproc->priv;
> > +	int err;
> > +	__u32 mmsg;
> > +
> > +	if (!priv->tx_ch) {
> > +		dev_err(priv->dev, "No initialized mbox tx channel\n");
> > +		return;
> > +	}
> > +
> > +	/*
> > +	 * Send the index of the triggered virtqueue as the mu payload.
> > +	 * Let remote processor know which virtqueue is used.
> > +	 */
> > +	mmsg =3D vqid << 16;
> > +
> > +	err =3D mbox_send_message(priv->tx_ch, (void *)&mmsg);
> > +	if (err < 0)
> > +		dev_err(priv->dev, "%s: failed (%d, err:%d)\n",
> > +			__func__, vqid, err);
> > +}
> > +
> >  static const struct rproc_ops imx_rproc_ops =3D {
> >  	.start		=3D imx_rproc_start,
> >  	.stop		=3D imx_rproc_stop,
> > +	.kick		=3D imx_rproc_kick,
> >  	.da_to_va       =3D imx_rproc_da_to_va,
> >  	.load		=3D rproc_elf_load_segments,
> >  	.parse_fw	=3D imx_rproc_parse_fw,
> > @@ -444,6 +477,65 @@ static int imx_rproc_addr_init(struct imx_rproc
> *priv,
> >  	return 0;
> >  }
> >
> > +static void imx_rproc_vq_work(struct work_struct *work) {
> > +	struct imx_rproc *priv =3D container_of(work, struct imx_rproc,
> > +					      rproc_work);
> > +
> > +	rproc_vq_interrupt(priv->rproc, 0);
> > +	rproc_vq_interrupt(priv->rproc, 1);
> > +}
> > +
> > +static void imx_rproc_rx_callback(struct mbox_client *cl, void *msg)
> > +{
> > +	struct rproc *rproc =3D dev_get_drvdata(cl->dev);
> > +	struct imx_rproc *priv =3D rproc->priv;
> > +
> > +	queue_work(priv->workqueue, &priv->rproc_work); }
> > +
> > +static int imx_rproc_xtr_mbox_init(struct rproc *rproc) {
> > +	struct imx_rproc *priv =3D rproc->priv;
> > +	struct device *dev =3D priv->dev;
> > +	struct mbox_client *cl;
> > +	int ret;
> > +
> > +	if (!of_get_property(dev->of_node, "mbox-names", NULL))
> > +		return 0;
> > +
> > +	cl =3D &priv->cl;
> > +	cl->dev =3D dev;
> > +	cl->tx_block =3D true;
> > +	cl->tx_tout =3D 100;
> > +	cl->knows_txdone =3D false;
> > +	cl->rx_callback =3D imx_rproc_rx_callback;
> > +
> > +	priv->tx_ch =3D mbox_request_channel_byname(cl, "tx");
> > +	if (IS_ERR(priv->tx_ch)) {
> > +		ret =3D PTR_ERR(priv->tx_ch);
> > +		return dev_err_probe(cl->dev, PTR_ERR(priv->tx_ch),
> > +				     "failed to request tx mailbox channel: %d\n", ret);
>=20
>         	return dev_err_probe(cl->dev, ret,
> 				     "failed to request tx mailbox channel: %d\n", ret);
> > +	}
> > +
> > +	priv->rx_ch =3D mbox_request_channel_byname(cl, "rx");
> > +	if (IS_ERR(priv->rx_ch)) {
> > +		mbox_free_channel(priv->tx_ch);
> > +		return dev_err_probe(cl->dev, PTR_ERR(priv->rx_ch),
> > +				     "failed to request mbox tx chan\n");
>=20
>         	ret =3D PTR_ERR(priv->rx_ch);
> 		return dev_err_probe(cl->dev, ret,
> 				     "failed to request rx mailbox channel: %d\n", ret);
>=20
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static void imx_rproc_free_mbox(struct rproc *rproc) {
> > +	struct imx_rproc *priv =3D rproc->priv;
> > +
> > +	mbox_free_channel(priv->tx_ch);
> > +	mbox_free_channel(priv->rx_ch);
> > +}
> > +
> >  static int imx_rproc_probe(struct platform_device *pdev)  {
> >  	struct device *dev =3D &pdev->dev;
> > @@ -481,18 +573,28 @@ static int imx_rproc_probe(struct
> platform_device *pdev)
> >  	priv->dev =3D dev;
> >
> >  	dev_set_drvdata(dev, rproc);
> > +	priv->workqueue =3D create_workqueue(dev_name(dev));
> > +	if (!priv->workqueue) {
> > +		dev_err(dev, "cannot create workqueue\n");
> > +		ret =3D -ENOMEM;
> > +		goto err_put_rproc;
> > +	}
> > +
> > +	ret =3D imx_rproc_xtr_mbox_init(rproc);
> > +	if (ret)
> > +		goto err_put_wkq;
> >
> >  	ret =3D imx_rproc_addr_init(priv, pdev);
> >  	if (ret) {
> >  		dev_err(dev, "failed on imx_rproc_addr_init\n");
> > -		goto err_put_rproc;
> > +		goto err_put_mbox;
> >  	}
> >
> >  	priv->clk =3D devm_clk_get(dev, NULL);
> >  	if (IS_ERR(priv->clk)) {
> >  		dev_err(dev, "Failed to get clock\n");
> >  		ret =3D PTR_ERR(priv->clk);
> > -		goto err_put_rproc;
> > +		goto err_put_mbox;
> >  	}
> >
> >  	/*
> > @@ -502,9 +604,11 @@ static int imx_rproc_probe(struct platform_device
> *pdev)
> >  	ret =3D clk_prepare_enable(priv->clk);
> >  	if (ret) {
> >  		dev_err(&rproc->dev, "Failed to enable clock\n");
> > -		goto err_put_rproc;
> > +		goto err_put_mbox;
> >  	}
> >
> > +	INIT_WORK(&(priv->rproc_work), imx_rproc_vq_work);
> > +
> >  	ret =3D rproc_add(rproc);
> >  	if (ret) {
> >  		dev_err(dev, "rproc_add failed\n"); @@ -515,6 +619,10 @@ static
> int
> > imx_rproc_probe(struct platform_device *pdev)
> >
> >  err_put_clk:
> >  	clk_disable_unprepare(priv->clk);
> > +err_put_mbox:
> > +	imx_rproc_free_mbox(rproc);
> > +err_put_wkq:
> > +	destroy_workqueue(priv->workqueue);
> >  err_put_rproc:
> >  	rproc_free(rproc);
> >
> > @@ -527,6 +635,7 @@ static int imx_rproc_remove(struct platform_device
> *pdev)
> >  	struct imx_rproc *priv =3D rproc->priv;
> >
> >  	clk_disable_unprepare(priv->clk);
> > +	imx_rproc_free_mbox(rproc);
>=20
> Function rproc_del() needs to be called first so that rproc_shutdown() is
> executed (because rproc->auto_boot is true).

Will fix it in next version.

Thanks,
Peng.

>=20
> Thanks,
> Mathieu
>=20
> >  	rproc_del(rproc);
> >  	rproc_free(rproc);
> >
> > --
> > 2.28.0
> >