linux-kernel - Re: [PATCH 2/3] scsi: ufs: initialize max_lu

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Date:   Mon, 13 Jan 2020 10:44:53 -0800
From:   asutoshd@...eaurora.org
To:     Bean Huo <huobean@...il.com>
Cc:     alim.akhtar@...sung.com, avri.altman@....com,
        pedrom.sousa@...opsys.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi-owner@...r.kernel.org
Subject: Re: [PATCH 2/3] scsi: ufs: initialize max_lu_supported while booting

On 2020-01-10 10:36, Bean Huo wrote:
> From: Bean Huo <beanhuo@...ron.com>
> 
> This patch is to add a new function ufshcd_init_device_param() for
> initialization of  UFS device related parameters which are used by
> driver. In this version patch, there is only dev_info.max_lu_supported
> being initialized.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 47 ++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 46 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 1b97f2dc0b63..a297fe55e36a 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3158,6 +3158,11 @@ static int ufshcd_read_device_desc(struct
> ufs_hba *hba, u8 *buf, u32 size)
>  	return ufshcd_read_desc(hba, QUERY_DESC_IDN_DEVICE, 0, buf, size);
>  }
> 
> +static int ufshcd_read_geometry_desc(struct ufs_hba *hba, u8 *buf, u32 
> size)
> +{
> +	return ufshcd_read_desc(hba, QUERY_DESC_IDN_GEOMETRY, 0, buf, size);
> +}
> +
>  /**
>   * struct uc_string_id - unicode string
>   *
> @@ -6827,6 +6832,37 @@ static void ufshcd_clear_dbg_ufs_stats(struct
> ufs_hba *hba)
>  	hba->req_abort_count = 0;
>  }
> 
> +static int ufshcd_init_device_param(struct ufs_hba *hba)
> +{
> +	int err;
> +	size_t buff_len;
> +	u8 *desc_buf;
> +
> +	buff_len = QUERY_DESC_MAX_SIZE;
> +	desc_buf = kmalloc(buff_len, GFP_KERNEL);
> +	if (!desc_buf) {
> +		err = -ENOMEM;
> +		goto out;
> +	}
> +
> +	err = ufshcd_read_geometry_desc(hba, desc_buf,
> +			hba->desc_size.geom_desc);
> +	if (err) {
> +		dev_err(hba->dev, "%s: Failed reading Geometry Desc. err = %d\n",
> +			__func__, err);
> +		goto out;
> +	}
> +
> +	if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 1)
> +		hba->dev_info.max_lu_supported = 32;
> +	else if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 0)
> +		hba->dev_info.max_lu_supported = 8;
> +
> +out:
> +	kfree(desc_buf);
> +	return err;
> +}
> +
>  static void ufshcd_init_desc_sizes(struct ufs_hba *hba)
>  {
>  	int err;
> @@ -7016,13 +7052,22 @@ static int ufshcd_probe_hba(struct ufs_hba 
> *hba)
> 
>  	/*
>  	 * If we are in error handling context or in power management 
> callbacks
> -	 * context, no need to scan the host
> +	 * context, no need to scan the host and to reinitialize the 
> parameters
>  	 */
>  	if (!ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
>  		bool flag;
> 
>  		/* clear any previous UFS device information */
>  		memset(&hba->dev_info, 0, sizeof(hba->dev_info));
> +		/* Init parameters according to UFS relevant descriptors */
> +		ret = ufshcd_init_device_param(hba);
> +		if (ret) {
> +			dev_err(hba->dev,
> +				"%s: Init of device param failed. err = %d\n",
> +				__func__, ret);
> +			goto out;
> +		}
> +
>  		if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
>  				QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
>  			hba->dev_info.f_power_on_wp_en = flag;

Looks good to me.
Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>