Re: [PATCH V1 5/5] accel/amd_vpci: Add communication channel service

[Christophe JAILLET <christophe.jaillet@wanadoo.fr>]

Le 11/11/2025 à 02:15, David Zhang a écrit :
> This patch introduces the communication channel (comm_chan) service, which
> enables communication between the management PF driver and the user PF
> driver.
> 
> The comm_chan service provides a shared-memory-based command channel
> located in a BAR-mapped region. The user PF driver issues requests by
> writing command messages into this region. The management PF driver
> periodically polls the region and process any pending requests.
> 
> Supported operations include firmware (xclbin) reloads, where the
> management PF invokes 'versal_pci_load_xclbin' to reprogram the embedded
> firmware through the remote management queue service.
> 
> This service provides the foundation for dynamic firmware updates and other
> management requests from the user PFs.
> 
> Co-developed-by: Nishad Saraf <nishads@amd.com>
> Signed-off-by: Nishad Saraf <nishads@amd.com>
> Signed-off-by: David Zhang <yidong.zhang@amd.com>

...

> @@ -160,10 +222,13 @@ static const struct config_item_type versal_pci_cfs_table = {
>   static int versal_pci_cfs_init(struct versal_pci_device *vdev)
>   {
>   	struct configfs_subsystem *subsys = &vdev->cfs_subsys;
> +	char dev_name[64] = "";

No need to init I think.

> +
> +	snprintf(dev_name, sizeof(dev_name), "%s%x", DRV_NAME, versal_pci_devid(vdev));

This hunk could already be in patch 1. This would make this patch smaller.

>   
>   	snprintf(subsys->su_group.cg_item.ci_namebuf,
>   		 sizeof(subsys->su_group.cg_item.ci_namebuf),
> -		 "%s%x", DRV_NAME, versal_pci_devid(vdev));
> +		 "%s", dev_name);
>   
>   	subsys->su_group.cg_item.ci_type = &versal_pci_cfs_table;
>   

...