linux-kernel - Re: [PATCH RFC v2 07/18] libata-scsi: Add ata_internal

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Message-ID: <da6a77ff-0dde-b0b4-4d6c-047eab48d595@opensource.wdc.com>
Date:   Mon, 13 Jun 2022 16:16:19 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     John Garry <john.garry@...wei.com>, axboe@...nel.dk,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, brking@...ibm.com,
        hare@...e.de, hch@....de
Cc:     linux-block@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        chenxiang66@...ilicon.com
Subject: Re: [PATCH RFC v2 07/18] libata-scsi: Add ata_internal_queuecommand()

On 6/9/22 19:29, 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, and set nr_reserved_cmds = 1, which
> matches tag ATA_TAG_INTERNAL.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/ata/libata-scsi.c | 14 ++++++++++++++
>  include/linux/libata.h    |  6 +++++-
>  2 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index baac35dd17ca..b2702ab0183b 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -1114,6 +1114,20 @@ 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)

ata_scsi_internal_queuecommand()

But given that this is used for the .reserved_queuecommand() method, I
would call it ata_scsi_reserved_queuecommand().

> +{
> +	struct ata_port *ap;
> +	int res;
> +
> +	ap = ata_shost_to_port(shost);

You can move this to ap declaration.

	struct ata_port *ap = ata_shost_to_port(shost);

> +	spin_lock_irq(ap->lock);

spin_lock_irqsave() ?

> +	res = ata_sas_queuecmd(scmd, ap);
> +	spin_unlock_irq(ap->lock);
> +
> +	return res;
> +}
> +EXPORT_SYMBOL_GPL(ata_internal_queuecommand);
> +
>  /**
>   *	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 43f4bcfe9a5f..5fa6f56bba81 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);
> @@ -1390,7 +1392,9 @@ extern const struct attribute_group *ata_common_sdev_groups[];
>  	.proc_name		= drv_name,			\
>  	.slave_destroy		= ata_scsi_slave_destroy,	\
>  	.bios_param		= ata_std_bios_param,		\
> -	.unlock_native_capacity	= ata_scsi_unlock_native_capacity
> +	.unlock_native_capacity	= ata_scsi_unlock_native_capacity,\
> +	.nr_reserved_cmds = 1,\
> +	.reserved_queuecommand = ata_internal_queuecommand
>  
>  #define ATA_SUBBASE_SHT(drv_name)				\
>  	__ATA_BASE_SHT(drv_name),				\


-- 
Damien Le Moal
Western Digital Research