linux-kernel - Re: [PATCH 07/10] bus/fsl-mc: Export a dprc scan function to be used by multiple entities

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Message-ID: <493be973-9b6b-2c24-ca38-00c17721ebb8@nxp.com>
Date:   Mon, 23 Mar 2020 14:48:36 +0200
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     Diana Craciun <diana.craciun@....nxp.com>,
        linux-kernel@...r.kernel.org, stuyoder@...il.com,
        leoyang.li@....com, linux-arm-kernel@...ts.infradead.org,
        bharatb.yadav@...il.com
Subject: Re: [PATCH 07/10] bus/fsl-mc: Export a dprc scan function to be used
 by multiple entities



On 3/19/2020 5:40 PM, Diana Craciun wrote:
> Currently the DPRC scan function is used only by the bus driver.
> But the same functionality will be needed by the VFIO driver.
> To support this, the dprc scan function was exported and a little
> bit adjusted to fit both scenarios.
> 
> Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
> ---
>  drivers/bus/fsl-mc/dprc-driver.c | 15 ++++++---------
>  drivers/bus/fsl-mc/fsl-mc-bus.c  |  2 ++
>  include/linux/fsl/mc.h           |  4 ++++
>  3 files changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
> index 7eaf78900dfc..789220f0372a 100644
> --- a/drivers/bus/fsl-mc/dprc-driver.c
> +++ b/drivers/bus/fsl-mc/dprc-driver.c
> @@ -335,7 +335,9 @@ static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
>   * bus driver with the actual state of the MC by adding and removing
>   * devices as appropriate.
>   */
> -static int dprc_scan_container(struct fsl_mc_device *mc_bus_dev)
> +int dprc_scan_container(struct fsl_mc_device *mc_bus_dev,
> +		   const char *driver_override,
> +		   bool alloc_interrupts)
>  {
>  	int error;
>  	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
> @@ -346,15 +348,12 @@ static int dprc_scan_container(struct fsl_mc_device *mc_bus_dev)
>  	 * Discover objects in the DPRC:
>  	 */
>  	mutex_lock(&mc_bus->scan_mutex);
> -	error = dprc_scan_objects(mc_bus_dev, NULL, true);
> +	error = dprc_scan_objects(mc_bus_dev, driver_override, alloc_interrupts);
>  	mutex_unlock(&mc_bus->scan_mutex);
> -	if (error < 0) {
> -		fsl_mc_cleanup_all_resource_pools(mc_bus_dev);
> -		return error;
> -	}
>  
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(dprc_scan_container);
>  
>  /**
>   * dprc_irq0_handler - Regular ISR for DPRC interrupt 0
> @@ -679,12 +678,10 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)
>  		goto error_cleanup_open;
>  	}
>  
> -	mutex_init(&mc_bus->scan_mutex);
> -

It's not obvious that this is related, maybe it should be mentioned in
the commit message.

>  	/*
>  	 * Discover MC objects in DPRC object:
>  	 */
> -	error = dprc_scan_container(mc_dev);
> +	error = dprc_scan_container(mc_dev, NULL, true);
>  	if (error < 0)
>  		goto error_cleanup_open;
>  
> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
> index a99a0edef252..1865221bb12d 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> @@ -635,7 +635,9 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
>  		if (!mc_bus)
>  			return -ENOMEM;
>  
> +		mutex_init(&mc_bus->scan_mutex);
>  		mc_dev = &mc_bus->mc_dev;
> +

nit: extra white space.

---
Best Regards, Laurentiu

>  	} else {
>  		/*
>  		 * Allocate a regular fsl_mc_device object:
> diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
> index b9d5e5955adb..2bdd96a482fb 100644
> --- a/include/linux/fsl/mc.h
> +++ b/include/linux/fsl/mc.h
> @@ -476,6 +476,10 @@ int dprc_reset_container(struct fsl_mc_io *mc_io,
>  			 u16 token,
>  			 int child_container_id);
>  
> +int dprc_scan_container(struct fsl_mc_device *mc_bus_dev,
> +		   const char *driver_override,
> +		   bool alloc_interrupts);
> +
>  /*
>   * Data Path Buffer Pool (DPBP) API
>   * Contains initialization APIs and runtime control APIs for DPBP
>