linux-kernel - Re: [PATCH v9 4/5] misc: fastrpc: Cleanup the domain names

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Message-ID: <4b190271-095e-4c6d-b823-e4d3c9e15fed@oss.qualcomm.com>
Date: Tue, 12 Aug 2025 11:28:59 +0530
From: Ekansh Gupta <ekansh.gupta@....qualcomm.com>
To: Ling Xu <quic_lxu5@...cinc.com>, srini@...nel.org,
        amahesh@....qualcomm.com, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, andersson@...nel.org, konradybcio@...nel.org,
        arnd@...db.de, gregkh@...uxfoundation.org
Cc: quic_kuiw@...cinc.com, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH v9 4/5] misc: fastrpc: Cleanup the domain names



On 7/16/2025 6:58 PM, Ling Xu wrote:
> Currently the domain ids are added for each instance of domains, this is
> totally not scalable approach. Clean this mess and create domain ids for
> only domains not its instances.
>
> Co-developed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> Signed-off-by: Ling Xu <quic_lxu5@...cinc.com>
> ---
>  drivers/misc/fastrpc.c | 36 ++++++++++++++++++++----------------
>  1 file changed, 20 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index 495ac47e7f90..85b6eb16b616 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -27,8 +27,6 @@
>  #define MDSP_DOMAIN_ID (1)
>  #define SDSP_DOMAIN_ID (2)
>  #define CDSP_DOMAIN_ID (3)
> -#define CDSP1_DOMAIN_ID (4)
> -#define FASTRPC_DEV_MAX		5 /* adsp, mdsp, slpi, cdsp, cdsp1 */
>  #define FASTRPC_MAX_SESSIONS	14
>  #define FASTRPC_MAX_VMIDS	16
>  #define FASTRPC_ALIGN		128
> @@ -106,8 +104,6 @@
>  
>  #define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscdev)
>  
> -static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
> -						"sdsp", "cdsp", "cdsp1" };
>  struct fastrpc_phy_page {
>  	u64 addr;		/* physical address */
>  	u64 size;		/* size of contiguous region */
> @@ -2243,6 +2239,20 @@ static int fastrpc_device_register(struct device *dev, struct fastrpc_channel_ct
>  	return err;
>  }
>  
> +static int fastrpc_get_domain_id(const char *domain)
> +{
> +	if (!strncmp(domain, "adsp", 4))
> +		return ADSP_DOMAIN_ID;
> +	else if (!strncmp(domain, "cdsp", 4))
> +		return CDSP_DOMAIN_ID;
> +	else if (!strncmp(domain, "mdsp", 4))
> +		return MDSP_DOMAIN_ID;
> +	else if (!strncmp(domain, "sdsp", 4))
> +		return SDSP_DOMAIN_ID;
> +
> +	return -EINVAL;
> +}
> +
>  static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
>  {
>  	struct device *rdev = &rpdev->dev;
> @@ -2260,15 +2270,10 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
>  		return err;
>  	}
>  
> -	for (i = 0; i < FASTRPC_DEV_MAX; i++) {
> -		if (!strcmp(domains[i], domain)) {
> -			domain_id = i;
> -			break;
> -		}
> -	}
> +	domain_id = fastrpc_get_domain_id(domain);
>  
>  	if (domain_id < 0) {
> -		dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
> +		dev_info(rdev, "FastRPC Domain %s not supported\n", domain);
>  		return -EINVAL;
>  	}
>  
> @@ -2318,21 +2323,20 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
>  	case ADSP_DOMAIN_ID:
>  	case MDSP_DOMAIN_ID:
>  	case SDSP_DOMAIN_ID:
> -		/* Unsigned PD offloading is only supported on CDSP and CDSP1 */
> +		/* Unsigned PD offloading is only supported on CDSP */
>  		data->unsigned_support = false;
> -		err = fastrpc_device_register(rdev, data, secure_dsp, domains[domain_id]);
> +		err = fastrpc_device_register(rdev, data, secure_dsp, domain);
>  		if (err)
>  			goto err_free_data;
>  		break;
>  	case CDSP_DOMAIN_ID:
> -	case CDSP1_DOMAIN_ID:
>  		data->unsigned_support = true;
>  		/* Create both device nodes so that we can allow both Signed and Unsigned PD */
> -		err = fastrpc_device_register(rdev, data, true, domains[domain_id]);
> +		err = fastrpc_device_register(rdev, data, true, domain);
>  		if (err)
>  			goto err_free_data;
>  
> -		err = fastrpc_device_register(rdev, data, false, domains[domain_id]);
> +		err = fastrpc_device_register(rdev, data, false, domain);
>  		if (err)
>  			goto err_deregister_fdev;
>  		break;

Reviewed-by: Ekansh Gupta <ekansh.gupta@....qualcomm.com>