linux-kernel - Re: [PATCH 02/10] bus/fsl-mc: Add a new parameter to dprc_scan

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Date:   Mon, 23 Mar 2020 14:04:39 +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 02/10] bus/fsl-mc: Add a new parameter to
 dprc_scan_objects function



On 3/19/2020 5:40 PM, Diana Craciun wrote:
> Prepare the dprc_scan_objects function to be used by
> the VFIO mc driver code. The function is used to scan the mc
> objects by the bus driver. The same functionality is
> needed by the VFIO mc driver, but in this case the
> interrupt configuration is delayed until the userspace
> configures the interrupts. In order to use the same function
> in both drivers add a new parameter.
> 
> Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
> ---
>  drivers/bus/fsl-mc/dprc-driver.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
> index 035b220779d0..d373b28abe2d 100644
> --- a/drivers/bus/fsl-mc/dprc-driver.c
> +++ b/drivers/bus/fsl-mc/dprc-driver.c
> @@ -198,7 +198,9 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
>   * dprc_scan_objects - Discover objects in a DPRC
>   *
>   * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
> - *
> + * @alloc_interrupts: if true the function allocates the interrupt pool,
> + * otherwise the interrupt allocation is delayed
> +

nit: missing * here.

---
Best Regards, Laurentiu

>   * Detects objects added and removed from a DPRC and synchronizes the
>   * state of the Linux bus driver, MC by adding and removing
>   * devices accordingly.
> @@ -211,7 +213,8 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
>   * populated before they can get allocation requests from probe callbacks
>   * of the device drivers for the non-allocatable devices.
>   */
> -static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev)
> +static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
> +			    bool alloc_interrupts)
>  {
>  	int num_child_objects;
>  	int dprc_get_obj_failures;
> @@ -299,7 +302,7 @@ static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev)
>  				 irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
>  		}
>  
> -		if (!mc_bus->irq_resources) {
> +		if (alloc_interrupts && !mc_bus->irq_resources) {
>  			error = fsl_mc_populate_irq_pool(mc_bus,
>  				FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
>  			if (error < 0)
> @@ -339,7 +342,7 @@ 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);
> +	error = dprc_scan_objects(mc_bus_dev, true);
>  	mutex_unlock(&mc_bus->scan_mutex);
>  	if (error < 0) {
>  		fsl_mc_cleanup_all_resource_pools(mc_bus_dev);
> @@ -409,7 +412,7 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
>  		      DPRC_IRQ_EVENT_OBJ_DESTROYED |
>  		      DPRC_IRQ_EVENT_OBJ_CREATED)) {
>  
> -		error = dprc_scan_objects(mc_dev);
> +		error = dprc_scan_objects(mc_dev, true);
>  		if (error < 0) {
>  			/*
>  			 * If the error is -ENXIO, we ignore it, as it indicates
>