Re: [PATCH 1/6] nvme: zns: Allow ZNS drives that have non-power_of_2 zone size

Damien Le Moal
2022-03-09T03:40:24Z

On 3/9/22 01:53, Pankaj Raghav wrote:
> Remove the condition which disallows non-power_of_2 zone size ZNS drive
> to be updated and use generic method to calculate number of zones
> instead of relying on log and shift based calculation on zone size.
>
> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
> ---
> drivers/nvme/host/zns.c | 9 +--------
> 1 file changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/drivers/nvme/host/zns.c b/drivers/nvme/host/zns.c
> index 9f81beb4df4e..ad02c61c0b52 100644
> --- a/drivers/nvme/host/zns.c
> +++ b/drivers/nvme/host/zns.c
> @@ -101,13 +101,6 @@ int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
> }
>
> ns->zsze = nvme_lba_to_sect(ns, le64_to_cpu(id->lbafe[lbaf].zsze));
> - if (!is_power_of_2(ns->zsze)) {
> - dev_warn(ns->ctrl->device,
> - "invalid zone size:%llu for namespace:%u\n",
> - ns->zsze, ns->head->ns_id);
> - status = -ENODEV;
> - goto free_data;
> - }
>
> blk_queue_set_zoned(ns->disk, BLK_ZONED_HM);
> blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
> @@ -129,7 +122,7 @@ static void *nvme_zns_alloc_report_buffer(struct nvme_ns *ns,
> sizeof(struct nvme_zone_descriptor);
>
> nr_zones = min_t(unsigned int, nr_zones,
> - get_capacity(ns->disk) >> ilog2(ns->zsze));
> + get_capacity(ns->disk) / ns->zsze);

This will not compile on 32-bits arch. This needs to use div64_u64().

>
> bufsize = sizeof(struct nvme_zone_report) +
> nr_zones * sizeof(struct nvme_zone_descriptor);

--
Damien Le Moal
Western Digital Research