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Date:   Fri, 8 Feb 2019 22:58:38 +0000
From:   "Derrick, Jonathan" <jonathan.derrick@...el.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zub@...ux.fjfi.cvut.cz" <zub@...ux.fjfi.cvut.cz>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "sbauer@...donthack.me" <sbauer@...donthack.me>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "jonas.rabenstein@...dium.uni-erlangen.de" 
        <jonas.rabenstein@...dium.uni-erlangen.de>
Subject: Re: [PATCH v4 12/16] block: sed-opal: unify retrieval of table
 columns

Looks good

Reviewed-by: Jon Derrick <jonathan.derrick@...el.com>

On Fri, 2019-02-01 at 21:50 +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
> 
> Instead of having multiple places defining the same argument list to get
> a specific column of a sed-opal table, provide a generic version and
> call it from those functions.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
> Reviewed-by: Scott Bauer <sbauer@...donthack.me>
> ---
>  block/opal_proto.h |   2 +
>  block/sed-opal.c   | 132 +++++++++++++++++----------------------------
>  2 files changed, 50 insertions(+), 84 deletions(-)
> 
> diff --git a/block/opal_proto.h b/block/opal_proto.h
> index e20be8258854..b6e352cfe982 100644
> --- a/block/opal_proto.h
> +++ b/block/opal_proto.h
> @@ -170,6 +170,8 @@ enum opal_token {
>  	OPAL_READLOCKED = 0x07,
>  	OPAL_WRITELOCKED = 0x08,
>  	OPAL_ACTIVEKEY = 0x0A,
> +	/* lockingsp table */
> +	OPAL_LIFECYCLE = 0x06,
>  	/* locking info table */
>  	OPAL_MAXRANGES = 0x04,
>  	 /* mbr control */
> diff --git a/block/sed-opal.c b/block/sed-opal.c
> index 88c84906ce98..2459ac4d523b 100644
> --- a/block/sed-opal.c
> +++ b/block/sed-opal.c
> @@ -1089,6 +1089,37 @@ static int finalize_and_send(struct opal_dev *dev, cont_fn cont)
>  	return opal_send_recv(dev, cont);
>  }
>  
> +/*
> + * request @column from table @table on device @dev. On success, the column
> + * data will be available in dev->resp->tok[4]
> + */
> +static int generic_get_column(struct opal_dev *dev, const u8 *table,
> +			      u64 column)
> +{
> +	int err;
> +
> +	err = cmd_start(dev, table, opalmethod[OPAL_GET]);
> +
> +	add_token_u8(&err, dev, OPAL_STARTLIST);
> +
> +	add_token_u8(&err, dev, OPAL_STARTNAME);
> +	add_token_u8(&err, dev, OPAL_STARTCOLUMN);
> +	add_token_u64(&err, dev, column);
> +	add_token_u8(&err, dev, OPAL_ENDNAME);
> +
> +	add_token_u8(&err, dev, OPAL_STARTNAME);
> +	add_token_u8(&err, dev, OPAL_ENDCOLUMN);
> +	add_token_u64(&err, dev, column);
> +	add_token_u8(&err, dev, OPAL_ENDNAME);
> +
> +	add_token_u8(&err, dev, OPAL_ENDLIST);
> +
> +	if (err)
> +		return err;
> +
> +	return finalize_and_send(dev, parse_and_check_status);
> +}
> +
>  static int gen_key(struct opal_dev *dev, void *data)
>  {
>  	u8 uid[OPAL_UID_LENGTH];
> @@ -1143,23 +1174,11 @@ static int get_active_key(struct opal_dev *dev, void *data)
>  	if (err)
>  		return err;
>  
> -	err = cmd_start(dev, uid, opalmethod[OPAL_GET]);
> -	add_token_u8(&err, dev, OPAL_STARTLIST);
> -	add_token_u8(&err, dev, OPAL_STARTNAME);
> -	add_token_u8(&err, dev, 3); /* startCloumn */
> -	add_token_u8(&err, dev, 10); /* ActiveKey */
> -	add_token_u8(&err, dev, OPAL_ENDNAME);
> -	add_token_u8(&err, dev, OPAL_STARTNAME);
> -	add_token_u8(&err, dev, 4); /* endColumn */
> -	add_token_u8(&err, dev, 10); /* ActiveKey */
> -	add_token_u8(&err, dev, OPAL_ENDNAME);
> -	add_token_u8(&err, dev, OPAL_ENDLIST);
> -	if (err) {
> -		pr_debug("Error building get active key command\n");
> +	err = generic_get_column(dev, uid, OPAL_ACTIVEKEY);
> +	if (err)
>  		return err;
> -	}
>  
> -	return finalize_and_send(dev, get_active_key_cont);
> +	return get_active_key_cont(dev);
>  }
>  
>  static int generic_lr_enable_disable(struct opal_dev *dev,
> @@ -1820,17 +1839,19 @@ static int activate_lsp(struct opal_dev *dev, void *data)
>  	return finalize_and_send(dev, parse_and_check_status);
>  }
>  
> -static int get_lsp_lifecycle_cont(struct opal_dev *dev)
> +/* Determine if we're in the Manufactured Inactive or Active state */
> +static int get_lsp_lifecycle(struct opal_dev *dev, void *data)
>  {
>  	u8 lc_status;
> -	int error = 0;
> +	int err;
>  
> -	error = parse_and_check_status(dev);
> -	if (error)
> -		return error;
> +	err = generic_get_column(dev, opaluid[OPAL_LOCKINGSP_UID],
> +				 OPAL_LIFECYCLE);
> +	if (err)
> +		return err;
>  
>  	lc_status = response_get_u64(&dev->parsed, 4);
> -	/* 0x08 is Manufacured Inactive */
> +	/* 0x08 is Manufactured Inactive */
>  	/* 0x09 is Manufactured */
>  	if (lc_status != OPAL_MANUFACTURED_INACTIVE) {
>  		pr_debug("Couldn't determine the status of the Lifecycle state\n");
> @@ -1840,49 +1861,19 @@ static int get_lsp_lifecycle_cont(struct opal_dev *dev)
>  	return 0;
>  }
>  
> -/* Determine if we're in the Manufactured Inactive or Active state */
> -static int get_lsp_lifecycle(struct opal_dev *dev, void *data)
> -{
> -	int err;
> -
> -	err = cmd_start(dev, opaluid[OPAL_LOCKINGSP_UID],
> -			opalmethod[OPAL_GET]);
> -
> -	add_token_u8(&err, dev, OPAL_STARTLIST);
> -
> -	add_token_u8(&err, dev, OPAL_STARTNAME);
> -	add_token_u8(&err, dev, 3); /* Start Column */
> -	add_token_u8(&err, dev, 6); /* Lifecycle Column */
> -	add_token_u8(&err, dev, OPAL_ENDNAME);
> -
> -	add_token_u8(&err, dev, OPAL_STARTNAME);
> -	add_token_u8(&err, dev, 4); /* End Column */
> -	add_token_u8(&err, dev, 6); /* Lifecycle Column */
> -	add_token_u8(&err, dev, OPAL_ENDNAME);
> -
> -	add_token_u8(&err, dev, OPAL_ENDLIST);
> -
> -	if (err) {
> -		pr_debug("Error Building GET Lifecycle Status command\n");
> -		return err;
> -	}
> -
> -	return finalize_and_send(dev, get_lsp_lifecycle_cont);
> -}
> -
> -static int get_msid_cpin_pin_cont(struct opal_dev *dev)
> +static int get_msid_cpin_pin(struct opal_dev *dev, void *data)
>  {
>  	const char *msid_pin;
>  	size_t strlen;
> -	int error = 0;
> +	int err;
>  
> -	error = parse_and_check_status(dev);
> -	if (error)
> -		return error;
> +	err = generic_get_column(dev, opaluid[OPAL_C_PIN_MSID], OPAL_PIN);
> +	if (err)
> +		return err;
>  
>  	strlen = response_get_string(&dev->parsed, 4, &msid_pin);
>  	if (!msid_pin) {
> -		pr_debug("%s: Couldn't extract PIN from response\n", __func__);
> +		pr_debug("Couldn't extract MSID_CPIN from response\n");
>  		return OPAL_INVAL_PARAM;
>  	}
>  
> @@ -1895,33 +1886,6 @@ static int get_msid_cpin_pin_cont(struct opal_dev *dev)
>  	return 0;
>  }
>  
> -static int get_msid_cpin_pin(struct opal_dev *dev, void *data)
> -{
> -	int err;
> -
> -	err = cmd_start(dev, opaluid[OPAL_C_PIN_MSID],
> -			opalmethod[OPAL_GET]);
> -
> -	add_token_u8(&err, dev, OPAL_STARTLIST);
> -	add_token_u8(&err, dev, OPAL_STARTNAME);
> -	add_token_u8(&err, dev, 3); /* Start Column */
> -	add_token_u8(&err, dev, 3); /* PIN */
> -	add_token_u8(&err, dev, OPAL_ENDNAME);
> -
> -	add_token_u8(&err, dev, OPAL_STARTNAME);
> -	add_token_u8(&err, dev, 4); /* End Column */
> -	add_token_u8(&err, dev, 3); /* Lifecycle Column */
> -	add_token_u8(&err, dev, OPAL_ENDNAME);
> -	add_token_u8(&err, dev, OPAL_ENDLIST);
> -
> -	if (err) {
> -		pr_debug("Error building Get MSID CPIN PIN command.\n");
> -		return err;
> -	}
> -
> -	return finalize_and_send(dev, get_msid_cpin_pin_cont);
> -}
> -
>  static int end_opal_session(struct opal_dev *dev, void *data)
>  {
>  	int err = 0;
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