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Date:   Sat, 30 Mar 2019 11:48:38 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Kanchan Joshi <joshi.k@...sung.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-nvme@...ts.infradead.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        axboe@...com, prakash.v@...sung.com, anshul@...sung.com,
        joshiiitr@...il.com
Subject: Re: [PATCH v3 1/7] block: extend stream count for in-kernel use

On Mar 29, 2019, at 1:53 AM, Kanchan Joshi <joshi.k@...sung.com> wrote:
> 
> This patch bumps up stream count to suppor in-kernel hints. It also
> adds 'streamid' member in 'request' and declares new API for driver
> to register stream-info with block layer.
> 
> Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
> ---
> include/linux/blkdev.h | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 338604d..4088e21 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -214,6 +214,7 @@ struct request {
> #endif
> 
> 	unsigned short write_hint;
> +	unsigned short streamid;
> 	unsigned short ioprio;
> 
> 	void *special;		/* opaque pointer available for LLD use */
> @@ -341,6 +342,8 @@ struct queue_limits {
> 	unsigned char		misaligned;
> 	unsigned char		discard_misaligned;
> 	unsigned char		raid_partial_stripes_expensive;
> +
> +	unsigned short		nr_streams;
> 	enum blk_zoned_model	zoned;
> };
> 
> @@ -567,8 +570,9 @@ struct request_queue {
> 	size_t			cmd_size;
> 
> 	struct work_struct	release_work;
> -
> -#define BLK_MAX_WRITE_HINTS	5
> +#define BLK_MAX_USER_HINTS	(WRITE_LIFE_KERN_MIN - 2)
> +#define BLK_MAX_KERN_HINTS	4
> +#define BLK_MAX_WRITE_HINTS	(1 + BLK_MAX_USER_HINTS + BLK_MAX_KERN_HINTS)
> 	u64			write_hints[BLK_MAX_WRITE_HINTS];
> };
> 
> @@ -1071,6 +1075,7 @@ extern void blk_queue_update_dma_alignment(struct request_queue *, int);
> extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
> extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
> extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
> +extern void blk_queue_stream_limits(struct request_queue *, unsigned short);

This declaration should be in the 2/7 patch where the function is added.


Cheers, Andreas






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