On 02/04/2016 02:08 PM, Javier González wrote:
> Flash controllers typically define flash pages as a collection of flash
> sectors of typically 4K. Moreover, flash controllers might program flash
> pages across several planes. This defines the write granurality at which
> flash can be programmed. This is different for each flash controller.
>
> In order to simplify calculations, and avoid repeating them in a per-I/O
> basis, this patch pre-calculates write granurality values as part of the
> device characteristics in the bring up.
>
> Signed-off-by: Javier González <javier@xxxxxxxxxxxx>
> ---
> drivers/lightnvm/rrpc.c | 4 ++++
> drivers/lightnvm/rrpc.h | 3 +++
> 2 files changed, 7 insertions(+)
>
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index 775bf6c2..8187bf3 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -1149,6 +1149,10 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
> if (!rrpc->luns)
> return -ENOMEM;
>
> + rrpc->min_write_pgs = dev->sec_per_pl * (dev->sec_size / PAGE_SIZE);
> + /* assume max_phys_sect % dev->min_write_pgs == 0 */
> + rrpc->max_write_pgs = dev->ops->max_phys_sect;
> +
> /* 1:1 mapping */
> for (i = 0; i < rrpc->nr_luns; i++) {
> struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i);
> diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h
> index 3989d65..868e91a 100644
> --- a/drivers/lightnvm/rrpc.h
> +++ b/drivers/lightnvm/rrpc.h
> @@ -107,6 +107,9 @@ struct rrpc {
> unsigned long long nr_sects;
> unsigned long total_blocks;
>
> + int min_write_pgs; /* minimum amount of pages required by controller */
> + int max_write_pgs; /* maximum amount of pages supported by controller */
> +
> /* Write strategy variables. Move these into each for structure for each
> * strategy
> */
>
This belongs to the write buffer patch.
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