Re: [PATCH v6 1/3] nvme: enable FDP support

[Hannes Reinecke <hare@suse.de>]

On 9/24/24 11:24, Kanchan Joshi wrote:
> Flexible Data Placement (FDP), as ratified in TP 4146a, allows the host
> to control the placement of logical blocks so as to reduce the SSD WAF.
> 
> Userspace can send the data lifetime information using the write hints.
> The SCSI driver (sd) can already pass this information to the SCSI
> devices. This patch does the same for NVMe.
> 
> Fetch the placement-identifiers if the device supports FDP.
> The incoming write-hint is mapped to a placement-identifier, which in
> turn is set in the DSPEC field of the write command.
> 
> Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
> Signed-off-by: Hui Qi <hui81.qi@samsung.com>
> Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
> ---
>   drivers/nvme/host/core.c | 70 ++++++++++++++++++++++++++++++++++++++++
>   drivers/nvme/host/nvme.h |  4 +++
>   include/linux/nvme.h     | 19 +++++++++++
>   3 files changed, 93 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich