linux-kernel - Re: [PATCH] lightnvm: calculate device values correctly

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Message-ID: <CACygaLCS=qHoa=Aj7amWv-e6rK4w1mZmFCC=eodJNQ_0LkgZ0w@mail.gmail.com>
Date:	Sun, 22 Nov 2015 22:05:09 +0800
From:	Wenwei Tao <ww.tao0320@...il.com>
To:	mb@...htnvm.io
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lightnvm: calculate device values correctly

I'm a new guy to flash, if I'm wrong about this patch, please correct me.
Thanks.

2015-11-22 21:51 GMT+08:00 Wenwei Tao <ww.tao0320@...il.com>:
> In the original calculation, the relationships among
> block, plane and lun was confusing, refine it on the
> basis of Open-channelSSDInterfaceSpecification.
>
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
>  drivers/lightnvm/core.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index f659e60..1864b94 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -174,8 +174,8 @@ static int nvm_core_init(struct nvm_dev *dev)
>         dev->nr_chnls = grp->num_ch;
>         dev->luns_per_chnl = grp->num_lun;
>         dev->pgs_per_blk = grp->num_pg;
> -       dev->blks_per_lun = grp->num_blk;
>         dev->nr_planes = grp->num_pln;
> +       dev->blks_per_lun = grp->num_blk * grp->num_pln;
>         dev->sec_size = grp->csecs;
>         dev->oob_size = grp->sos;
>         dev->sec_per_pg = grp->fpg_sz / grp->csecs;
> @@ -191,13 +191,12 @@ static int nvm_core_init(struct nvm_dev *dev)
>                 dev->plane_mode = NVM_PLANE_QUAD;
>
>         /* calculated values */
> -       dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
> -       dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
> +       dev->sec_per_blk = dev->sec_per_pg * dev->pgs_per_blk;
> +       dev->sec_per_pl = dev->sec_per_blk * grp->num_blk;
>         dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun;
>         dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
>
> -       dev->total_blocks = dev->nr_planes *
> -                               dev->blks_per_lun *
> +       dev->total_blocks = dev->blks_per_lun *
>                                 dev->luns_per_chnl *
>                                 dev->nr_chnls;
>         dev->total_pages = dev->total_blocks * dev->pgs_per_blk;
> --
> 1.9.1
>
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