linux-kernel - Re: [PATCH] block: IBM RamSan 70/80 device driver.

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Message-ID: <x494ni5uipk.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 25 Jan 2013 15:10:47 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	"Philip J. Kelleher" <pjk1939@...ibm.com>
Cc:	axboe@...nel.dk, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, brking@...ux.vnet.ibm.com
Subject: Re: [PATCH] block: IBM RamSan 70/80 device driver.

"Philip J. Kelleher" <pjk1939@...ibm.com> writes:

> From: Joshua H Morris <josh.h.morris@...ibm.com>
> 	Philip J Kelleher <pjk1939@...ibm.com>
>
> This patch includes the device driver for the IBM RamSan family
> of PCI SSD flash storage cards. This driver will inlcude support for the
> RamSan 70 and 80. The driver presents a block device for device I/O.

Hi,

Your driver does not handle REQ_FLUSH.  Does that mean that the
supported cards do not have a volatile write-back cache?

> +	blk_size = rsxx_get_logical_block_size(card);
> +
> +	blk_queue_make_request(card->queue, rsxx_make_request);
> +	blk_queue_bounce_limit(card->queue, BLK_BOUNCE_ANY);
> +	blk_queue_dma_alignment(card->queue, blk_size - 1);
> +	blk_queue_max_hw_sectors(card->queue, blkdev_max_hw_sectors);
> +	blk_queue_logical_block_size(card->queue, blk_size);
> +	blk_queue_physical_block_size(card->queue, RSXX_HW_BLK_SIZE);
> +	blk_queue_max_discard_sectors(card->queue, RSXX_HW_BLK_SIZE >> 9);

Did you mean to set max_discard_sectors inside the below for loop?
Either way, do you really only support a single hardware sector discard?

> +	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, card->queue);
> +	if (rsxx_discard_supported(card)) {
> +		queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, card->queue);
> +		card->queue->limits.discard_granularity = RSXX_HW_BLK_SIZE;
> +		card->queue->limits.discard_alignment   = RSXX_HW_BLK_SIZE;
> +		card->queue->limits.discard_zeroes_data = 1;
> +	}

Cheers,
Jeff
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