linux-kernel - Re: [PATCH RFC v3 2/7] ata: libata-scsi: Add ata_internal

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Message-ID: <08fdb698-0df3-7bc8-e6af-7d13cc96acfa@opensource.wdc.com>
Date:   Thu, 27 Oct 2022 10:45:40 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, hare@...e.de, bvanassche@....org,
        hch@....de, ming.lei@...hat.com, niklas.cassel@....com
Cc:     axboe@...nel.dk, jinpu.wang@...ud.ionos.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
        linuxarm@...wei.com
Subject: Re: [PATCH RFC v3 2/7] ata: libata-scsi: Add
 ata_internal_queuecommand()

On 10/25/22 19:32, John Garry wrote:
> Add callback to queue reserved commands - call it "internal" as this is
> what libata uses.
> 
> Also add it to the base ATA SHT.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/ata/libata-scsi.c | 14 ++++++++++++++
>  include/linux/libata.h    |  5 ++++-
>  2 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 30d7c90b0c35..0d6f37d80137 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -1118,6 +1118,20 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
>  	return 0;
>  }
>  
> +int ata_internal_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
> +{
> +	struct ata_port *ap;
> +	int res;
> +
> +	ap = ata_shost_to_port(shost);

You can have this initialization together with the ap declaration.

> +	spin_lock_irq(ap->lock);
> +	res = ata_sas_queuecmd(scmd, ap);
> +	spin_unlock_irq(ap->lock);
> +
> +	return res;
> +}
> +EXPORT_SYMBOL_GPL(ata_internal_queuecommand);

I am officially lost here. Do not see why this function is needed...

> +
>  /**
>   *	ata_scsi_slave_config - Set SCSI device attributes
>   *	@sdev: SCSI device to examine
> diff --git a/include/linux/libata.h b/include/linux/libata.h
> index 8938b584520f..f09c5dca16ce 100644
> --- a/include/linux/libata.h
> +++ b/include/linux/libata.h
> @@ -1141,6 +1141,8 @@ extern int ata_std_bios_param(struct scsi_device *sdev,
>  			      sector_t capacity, int geom[]);
>  extern void ata_scsi_unlock_native_capacity(struct scsi_device *sdev);
>  extern int ata_scsi_slave_config(struct scsi_device *sdev);
> +extern int ata_internal_queuecommand(struct Scsi_Host *shost,
> +				struct scsi_cmnd *scmd);
>  extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
>  extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
>  				       int queue_depth);
> @@ -1391,7 +1393,8 @@ extern const struct attribute_group *ata_common_sdev_groups[];
>  	.slave_destroy		= ata_scsi_slave_destroy,	\
>  	.bios_param		= ata_std_bios_param,		\
>  	.unlock_native_capacity	= ata_scsi_unlock_native_capacity,\
> -	.max_sectors		= ATA_MAX_SECTORS_LBA48
> +	.max_sectors		= ATA_MAX_SECTORS_LBA48,\
> +	.reserved_queuecommand = ata_internal_queuecommand
>  
>  #define ATA_SUBBASE_SHT(drv_name)				\
>  	__ATA_BASE_SHT(drv_name),				\

-- 
Damien Le Moal
Western Digital Research