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@xxxxxxxxxxx> Signed-off-by: Hui Qi <hui81.qi@xxxxxxxxxxx> Signed-off-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx> --- 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@xxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@xxxxxxx +49 911 74053 688 SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich
