linux-kernel - Re: [PATCH v5 08/15] scsi: ufs: add retries to dme

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Date:	Tue, 27 Oct 2015 14:58:50 -0000
From:	"Gilad Broner" <gbroner@...eaurora.org>
To:	"Yaniv Gardi" <ygardi@...eaurora.org>
Cc:	robherring2@...il.com, james.bottomley@...senpartnership.com,
	pebolle@...cali.nl, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
	ygardi@...eaurora.org, gbroner@...eaurora.org,
	draviv@...eaurora.org, "Lee Susman" <lsusman@...eaurora.org>,
	"Vinayak Holikatti" <vinholikatti@...il.com>,
	"James E.J. Bottomley" <jbottomley@...n.com>
Subject: Re: [PATCH v5 08/15] scsi: ufs: add retries to dme_peer get and set
 attribute

Reviewed-by: Gilad Broner <gbroner@...eaurora.org>

> The dme_peer get/set attribute commands are prone to errors, therefore
> we add three retries for the UIC command sending.
> Error code returned from ufshcd_send_uic_cmd() is checked, and unless
> it was successful or the retries have finished, another command will be
> sent.
>
> Signed-off-by: Lee Susman <lsusman@...eaurora.org>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> ---
>  drivers/scsi/ufs/ufshcd.c | 40 +++++++++++++++++++++++++++++-----------
>  1 file changed, 29 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 8a04691..5005d12 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -70,6 +70,9 @@
>  /* Task management command timeout */
>  #define TM_CMD_TIMEOUT	100 /* msecs */
>
> +/* maximum number of retries for a general UIC command  */
> +#define UFS_UIC_COMMAND_RETRIES 3
> +
>  /* maximum number of link-startup retries */
>  #define DME_LINKSTARTUP_RETRIES 3
>
> @@ -2185,6 +2188,7 @@ int ufshcd_dme_set_attr(struct ufs_hba *hba, u32
> attr_sel,
>  	};
>  	const char *set = action[!!peer];
>  	int ret;
> +	int retries = UFS_UIC_COMMAND_RETRIES;
>
>  	uic_cmd.command = peer ?
>  		UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
> @@ -2192,10 +2196,18 @@ int ufshcd_dme_set_attr(struct ufs_hba *hba, u32
> attr_sel,
>  	uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
>  	uic_cmd.argument3 = mib_val;
>
> -	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
> -	if (ret)
> -		dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
> -			set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
> +	do {
> +		/* for peer attributes we retry upon failure */
> +		ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
> +		if (ret)
> +			dev_dbg(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
> +				set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
> +	} while (ret && peer && --retries);
> +
> +	if (!retries)
> +		dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x failed %d retries\n",
> +				set, UIC_GET_ATTR_ID(attr_sel), mib_val,
> +				retries);
>
>  	return ret;
>  }
> @@ -2220,6 +2232,7 @@ int ufshcd_dme_get_attr(struct ufs_hba *hba, u32
> attr_sel,
>  	};
>  	const char *get = action[!!peer];
>  	int ret;
> +	int retries = UFS_UIC_COMMAND_RETRIES;
>  	struct ufs_pa_layer_attr orig_pwr_info;
>  	struct ufs_pa_layer_attr temp_pwr_info;
>  	bool pwr_mode_change = false;
> @@ -2250,14 +2263,19 @@ int ufshcd_dme_get_attr(struct ufs_hba *hba, u32
> attr_sel,
>  		UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
>  	uic_cmd.argument1 = attr_sel;
>
> -	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
> -	if (ret) {
> -		dev_err(hba->dev, "%s: attr-id 0x%x error code %d\n",
> -			get, UIC_GET_ATTR_ID(attr_sel), ret);
> -		goto out;
> -	}
> +	do {
> +		/* for peer attributes we retry upon failure */
> +		ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
> +		if (ret)
> +			dev_dbg(hba->dev, "%s: attr-id 0x%x error code %d\n",
> +				get, UIC_GET_ATTR_ID(attr_sel), ret);
> +	} while (ret && peer && --retries);
> +
> +	if (!retries)
> +		dev_err(hba->dev, "%s: attr-id 0x%x failed %d retries\n",
> +				get, UIC_GET_ATTR_ID(attr_sel), retries);
>
> -	if (mib_val)
> +	if (mib_val && !ret)
>  		*mib_val = uic_cmd.argument3;
>
>  	if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)
> --
> 1.8.5.2
>
> --
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> --
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-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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