linux-kernel - Re: [PATCH 07/17] remoteproc/omap: Initialize and assign reserved memory node

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Date:   Mon, 11 Nov 2019 15:23:29 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Tero Kristo <t-kristo@...com>
Cc:     ohad@...ery.com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        s-anna@...com
Subject: Re: [PATCH 07/17] remoteproc/omap: Initialize and assign reserved
 memory node

On Mon 28 Oct 05:42 PDT 2019, Tero Kristo wrote:

> From: Suman Anna <s-anna@...com>
> 
> The reserved memory nodes are not assigned to platform devices by
> default in the driver core to avoid the lookup for every platform
> device and incur a penalty as the real users are expected to be
> only a few devices.
> 
> OMAP remoteproc devices fall into the above category and the OMAP
> remoteproc driver _requires_ specific CMA pools to be assigned
> for each device at the moment to align on the location of the
> vrings and vring buffers in the RTOS-side firmware images. So,
> use the of_reserved_mem_device_init/release() API appropriately
> to assign the corresponding reserved memory region to the OMAP
> remoteproc device. Note that only one region per device is
> allowed by the framework.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Tero Kristo <t-kristo@...com>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/remoteproc/omap_remoteproc.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
> index 0524f7e0ffa4..0b80570effee 100644
> --- a/drivers/remoteproc/omap_remoteproc.c
> +++ b/drivers/remoteproc/omap_remoteproc.c
> @@ -17,6 +17,7 @@
>  #include <linux/module.h>
>  #include <linux/err.h>
>  #include <linux/of_device.h>
> +#include <linux/of_reserved_mem.h>
>  #include <linux/platform_device.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/remoteproc.h>
> @@ -454,14 +455,22 @@ static int omap_rproc_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto free_rproc;
>  
> +	ret = of_reserved_mem_device_init(&pdev->dev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "device does not have specific CMA pool\n");
> +		goto free_rproc;
> +	}
> +
>  	platform_set_drvdata(pdev, rproc);
>  
>  	ret = rproc_add(rproc);
>  	if (ret)
> -		goto free_rproc;
> +		goto release_mem;
>  
>  	return 0;
>  
> +release_mem:
> +	of_reserved_mem_device_release(&pdev->dev);
>  free_rproc:
>  	rproc_free(rproc);
>  	return ret;
> @@ -473,6 +482,7 @@ static int omap_rproc_remove(struct platform_device *pdev)
>  
>  	rproc_del(rproc);
>  	rproc_free(rproc);
> +	of_reserved_mem_device_release(&pdev->dev);
>  
>  	return 0;
>  }
> -- 
> 2.17.1
> 
> --
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki