linux-kernel - Re: [PATCH v6 1/3] scsi: ufs: add ioctl interface for query request

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Message-ID: <CAC5umyiry3OEJGeZ2=U21v7gAjsC7XHZVyiZN8UgQusX2KmvpQ@mail.gmail.com>
Date:	Thu, 12 Mar 2015 22:30:36 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Gilad Broner <gbroner@...eaurora.org>
Cc:	Jej B <James.Bottomley@...senpartnership.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org, Santosh Y <santoshsy@...il.com>,
	linux-scsi-owner@...r.kernel.org,
	Subhash Jadavani <subhashj@...eaurora.org>,
	Yaniv Gardi <ygardi@...eaurora.org>,
	Dolev Raviv <draviv@...eaurora.org>,
	Noa Rubens <noag@...eaurora.org>,
	Raviv Shvili <rshvili@...eaurora.org>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"open list:ABI/API" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] scsi: ufs: add ioctl interface for query request

2015-03-12 21:27 GMT+09:00 Gilad Broner <gbroner@...eaurora.org>:
> From: Dolev Raviv <draviv@...eaurora.org>
>
> This patch exposes the ioctl interface for UFS driver via SCSI device
> ioctl interface. As of now UFS driver would provide the ioctl for query
> interface to connected UFS device.
>
> Signed-off-by: Dolev Raviv <draviv@...eaurora.org>
> Signed-off-by: Noa Rubens <noag@...eaurora.org>
> Signed-off-by: Raviv Shvili <rshvili@...eaurora.org>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>

Sorry to bother you again.  Could you read two comments below?

> +/**
> + * ufshcd_ioctl - ufs ioctl callback registered in scsi_host
> + * @dev: scsi device required for per LUN queries
> + * @cmd: command opcode
> + * @buffer: user space buffer for transferring data
> + *
> + * Supported commands:
> + * UFS_IOCTL_QUERY
> + */
> +static int ufshcd_ioctl(struct scsi_device *dev, int cmd, void __user *buffer)
> +{
> +       struct ufs_hba *hba = shost_priv(dev->host);
> +       int err = 0;
> +
> +       BUG_ON(!hba);
> +       if (!buffer) {
> +               dev_err(hba->dev, "%s: User buffer is NULL!\n", __func__);
> +               return -EINVAL;
> +       }
> +

Should we remove this check or move it into ufshcd_query_ioctl()?
For example, BLKFLS ioctl without argument is correct usage, but
it always triggers this message. (blkdev_ioctl -> __blkdev_driver_ioctl
-> sd_ioctl -> scsi_ioctl -> ufshcd_ioctl)

> +       switch (cmd) {
> +       case UFS_IOCTL_QUERY:
> +               pm_runtime_get_sync(hba->dev);
> +               err = ufshcd_query_ioctl(hba, ufshcd_scsi_to_upiu_lun(dev->lun),
> +                               buffer);
> +               pm_runtime_put_sync(hba->dev);
> +               break;
> +       case UFS_IOCTL_BLKROSET:
> +               err = -ENOIOCTLCMD;
> +               break;
> +       default:
> +               err = -EINVAL;
> +               dev_err(hba->dev, "%s: Illegal ufs-IOCTL cmd %d\n", __func__,
> +                               cmd);
> +               break;
> +       }
> +
> +       return err;
> +}
> +
>  static struct scsi_host_template ufshcd_driver_template = {
>         .module                 = THIS_MODULE,
>         .name                   = UFSHCD,
> @@ -4213,6 +4433,7 @@ static struct scsi_host_template ufshcd_driver_template = {
>         .eh_abort_handler       = ufshcd_abort,
>         .eh_device_reset_handler = ufshcd_eh_device_reset_handler,
>         .eh_host_reset_handler   = ufshcd_eh_host_reset_handler,
> +       .ioctl                  = ufshcd_ioctl,
>         .this_id                = -1,
>         .sg_tablesize           = SG_ALL,
>         .cmd_per_lun            = UFSHCD_CMD_PER_LUN,

...

> diff --git a/include/uapi/scsi/ufs/ioctl.h b/include/uapi/scsi/ufs/ioctl.h
> new file mode 100644
> index 0000000..bc4eed7
> --- /dev/null
> +++ b/include/uapi/scsi/ufs/ioctl.h
> @@ -0,0 +1,57 @@
> +#ifndef UAPI_UFS_IOCTL_H_
> +#define UAPI_UFS_IOCTL_H_
> +
> +#include <linux/types.h>
> +
> +/*
> + *  IOCTL opcode for ufs queries has the following opcode after
> + *  SCSI_IOCTL_GET_PCI
> + */
> +#define UFS_IOCTL_QUERY                        0x5388

Should we also need some comments near SCSI_IOCTL_GET_PCI in
include/scsi/scsi.h in order to avoid someone trying to define
the same ioctl code in the future?
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