Linux-ARM-Kernel Archive on lore.kernel.org
 help / color / Atom feed
From: Peng Fan <peng.fan@nxp.com>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"mathieu.poirier@linaro.org" <mathieu.poirier@linaro.org>,
	"festevam@gmail.com" <festevam@gmail.com>,
	"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
	"linux-remoteproc@vger.kernel.org"
	<linux-remoteproc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	dl-linux-imx <linux-imx@nxp.com>,
	"kernel@pengutronix.de" <kernel@pengutronix.de>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: RE: [PATCH 03/10] remoteproc: imx: use devm_ioremap
Date: Mon, 27 Jul 2020 06:51:00 +0000
Message-ID: <DB6PR0402MB276063FBE74FCF222CB00F8588720@DB6PR0402MB2760.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20200727064151.767kc7622tcqmqfs@pengutronix.de>

> Subject: Re: [PATCH 03/10] remoteproc: imx: use devm_ioremap
> 
> On Mon, Jul 27, 2020 at 06:28:20AM +0000, Peng Fan wrote:
> > Hi Oleksij,
> >
> > > Subject: Re: [PATCH 03/10] remoteproc: imx: use devm_ioremap
> > >
> > > On Fri, Jul 24, 2020 at 04:08:06PM +0800, Peng Fan wrote:
> > > > We might need to map an region multiple times, becaue the region
> > > > might be shared between remote processors, such i.MX8QM with dual
> M4 cores.
> > > > So use devm_ioremap, not devm_ioremap_resource.
> > >
> > > Can you please give an example of this kind of shared resources and
> > > how they should be handled by two separate devices?
> >
> > This is to share vdevbuffer space, there is a vdevbuffer in device
> > tree, it will be shared between M4_0 and M4_1.
> >
> > For the buffer, it is Linux DMA API will handle the space.
> 
> Why remoteproc need to care about it? If I see it correctly, from the linux
> perspective, it is one buffer and one driver is responsible for it. Or do I missing
> some thing?

We not have the vdev buffer in resource table, so I added in device tree, see below:

        imx8qm_cm40: imx8qm_cm4@0 {
                compatible = "fsl,imx8qm-cm4";
                rsc-da = <0x90000000>;
                mbox-names = "tx", "rx", "rxdb";
                mboxes = <&lsio_mu5 0 1
                          &lsio_mu5 1 1
                          &lsio_mu5 3 1>;
                mub-partition = <3>;
                memory-region = <&vdev0vring0>, <&vdev0vring1>, <&vdevbuffer>,
                                <&vdev1vring0>, <&vdev1vring1>;
                core-index = <0>;
                core-id = <IMX_SC_R_M4_0_PID0>;
                status = "okay";
                power-domains = <&pd IMX_SC_R_M4_0_PID0>,
                                <&pd IMX_SC_R_M4_0_MU_1A>;
        };

        imx8qm_cm41: imx8x_cm4@1 {
                compatible = "fsl,imx8qm-cm4";
                rsc-da = <0x90100000>;
                mbox-names = "tx", "rx", "rxdb";
                mboxes = <&lsio_mu6 0 1
                          &lsio_mu6 1 1
                          &lsio_mu6 3 1>;
                mub-partition = <4>;
                memory-region = <&vdev2vring0>, <&vdev2vring1>, <&vdevbuffer>,
                                <&vdev3vring0>, <&vdev3vring1>;
                core-index = <1>;
                core-id = <IMX_SC_R_M4_1_PID0>;
                status = "okay";
                power-domains = <&pd IMX_SC_R_M4_1_PID0>,
                                <&pd IMX_SC_R_M4_1_MU_1A>;
        };

                vdevbuffer: vdevbuffer {
                        compatible = "shared-dma-pool";
                        reg = <0 0x90400000 0 0x100000>;
                        no-map;
                };

I have the upper vdevbuffer node shared between M40 and M41 node.
The vdevbuffer will be used as virtio data buffer.

And I have the following in rproc_add_virtio_dev to share vdevbuffer:
        /* Try to find dedicated vdev buffer carveout */
        mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer", rvdev->index);
        if (!mem)
                mem = rproc_find_carveout_by_name(rproc, "vdevbuffer");


Hope this is clear.


Thanks,
Peng.

> 
> > Thanks,
> > Peng.
> >
> > >
> > > > Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
> > > > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> > > > ---
> > > >  drivers/remoteproc/imx_rproc.c | 5 +++--
> > > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/drivers/remoteproc/imx_rproc.c
> > > > b/drivers/remoteproc/imx_rproc.c index 3b3904ebac75..82594a800a1b
> > > > 100644
> > > > --- a/drivers/remoteproc/imx_rproc.c
> > > > +++ b/drivers/remoteproc/imx_rproc.c
> > > > @@ -296,9 +296,10 @@ static int imx_rproc_addr_init(struct
> > > > imx_rproc
> > > *priv,
> > > >  		if (b >= IMX7D_RPROC_MEM_MAX)
> > > >  			break;
> > > >
> > > > -		priv->mem[b].cpu_addr =
> devm_ioremap_resource(&pdev->dev,
> > > &res);
> > > > +		/* Not use resource version, because we might share region*/
> > > > +		priv->mem[b].cpu_addr = devm_ioremap(&pdev->dev,
> res.start,
> > > > +resource_size(&res));
> > > >  		if (IS_ERR(priv->mem[b].cpu_addr)) {
> > > > -			dev_err(dev, "devm_ioremap_resource failed\n");
> > > > +			dev_err(dev, "devm_ioremap %pR failed\n", &res);
> > > >  			err = PTR_ERR(priv->mem[b].cpu_addr);
> > > >  			return err;
> > > >  		}
> > > > --
> > > > 2.16.4
> > > >
> > > >
> > >
> > > --
> > > Pengutronix e.K.                           |
> > > |
> > > Steuerwalder Str. 21                       |
> > > http://www.pengutronix.de/  |
> > > 31137 Hildesheim, Germany                  | Phone:
> > > +49-5121-206917-0    |
> > > Amtsgericht Hildesheim, HRA 2686           | Fax:
> > > +49-5121-206917-5555 |
> 
> --
> Pengutronix e.K.                           |
> |
> Steuerwalder Str. 21                       |
> http://www.pengutronix.de/  |
> 31137 Hildesheim, Germany                  | Phone:
> +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:
> +49-5121-206917-5555 |
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-24  8:08 [PATCH 00/10] remoteproc: imx_rproc: support iMX8M and early boot Peng Fan
2020-07-24  8:08 ` [PATCH 01/10] dt-bindings: remoteproc: imx_rproc: add i.MX8MQ/M Peng Fan
2020-07-31 20:14   ` Rob Herring
2020-07-24  8:08 ` [PATCH 02/10] remoteproc: imx_rproc: correct err message Peng Fan
2020-08-11 19:56   ` Mathieu Poirier
2020-07-24  8:08 ` [PATCH 03/10] remoteproc: imx: use devm_ioremap Peng Fan
2020-07-27  6:23   ` Oleksij Rempel
2020-07-27  6:28     ` Peng Fan
2020-07-27  6:41       ` Oleksij Rempel
2020-07-27  6:51         ` Peng Fan [this message]
2020-07-27  7:37           ` Oleksij Rempel
2020-07-27  8:11             ` Peng Fan
2020-07-28  7:20               ` Oleksij Rempel
2020-07-24  8:08 ` [PATCH 04/10] remoteproc: imx_rproc: make syscon optional Peng Fan
2020-08-11 22:40   ` Mathieu Poirier
2020-08-18 21:43   ` Mathieu Poirier
2020-08-19  0:51     ` Peng Fan
2020-08-19 19:45       ` Mathieu Poirier
2020-08-20  2:04         ` Peng Fan
2020-08-20 19:27           ` Mathieu Poirier
2020-07-24  8:08 ` [PATCH 05/10] remoteproc: imx_rproc: make clk optional Peng Fan
2020-07-24  8:08 ` [PATCH 06/10] remoteproc: imx_rproc: add load hook Peng Fan
2020-07-27  5:20   ` Oleksij Rempel
2020-08-11 21:40   ` Mathieu Poirier
2020-07-24  8:08 ` [PATCH 07/10] remoteproc: imx_rproc: add i.MX specific parse fw hook Peng Fan
2020-08-11 21:56   ` Mathieu Poirier
2020-07-24  8:08 ` [PATCH 08/10] remoteproc: imx_rproc: support i.MX8MQ/M Peng Fan
2020-07-24  8:08 ` [PATCH 09/10] remoteproc: imx_proc: enable virtio/mailbox Peng Fan
2020-07-24  8:08 ` [PATCH 10/10] remoteproc: imx_rproc: support coproc booting before Linux Peng Fan
2020-08-11 22:36   ` Mathieu Poirier
2020-07-27  6:38 ` [PATCH 00/10] remoteproc: imx_rproc: support iMX8M and early boot Oleksij Rempel
2020-07-27  6:44   ` Peng Fan
2020-07-27  7:54     ` Oleksij Rempel
2020-07-27  9:18       ` Peng Fan
2020-07-28  7:26         ` Oleksij Rempel
2020-07-28  7:50           ` Peng Fan
2020-07-28  7:55             ` Oleksij Rempel
2020-07-28  9:36               ` Peng Fan

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=DB6PR0402MB276063FBE74FCF222CB00F8588720@DB6PR0402MB2760.eurprd04.prod.outlook.com \
    --to=peng.fan@nxp.com \
    --cc=bjorn.andersson@linaro.org \
    --cc=devicetree@vger.kernel.org \
    --cc=festevam@gmail.com \
    --cc=kernel@pengutronix.de \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-remoteproc@vger.kernel.org \
    --cc=mathieu.poirier@linaro.org \
    --cc=o.rempel@pengutronix.de \
    --cc=robh+dt@kernel.org \
    --cc=s.hauer@pengutronix.de \
    --cc=shawnguo@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-ARM-Kernel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/0 linux-arm-kernel/git/0.git
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/1 linux-arm-kernel/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-arm-kernel linux-arm-kernel/ https://lore.kernel.org/linux-arm-kernel \
		linux-arm-kernel@lists.infradead.org
	public-inbox-index linux-arm-kernel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-arm-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git