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    SubjectRe: [PATCH 08/20] lightnvm: complete geo structure with maxoc*
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    On 02/22/2018 10:52 AM, Javier Gonzalez wrote:
    >> On 22 Feb 2018, at 10.45, Matias Bjørling <mb@lightnvm.io> wrote:
    >>
    >> On 02/22/2018 08:55 AM, Javier Gonzalez wrote:
    >>>> On 22 Feb 2018, at 08.45, Matias Bjørling <mb@lightnvm.io> wrote:
    >>>>
    >>>> On 02/21/2018 10:26 AM, Javier González wrote:
    >>>>> Complete the generic geometry structure with the maxoc and maxocpu
    >>>>> felds, present in the 2.0 spec.
    >>>>> Signed-off-by: Javier González <javier@cnexlabs.com>
    >>>>> ---
    >>>>> drivers/nvme/host/lightnvm.c | 4 ++++
    >>>>> include/linux/lightnvm.h | 2 ++
    >>>>> 2 files changed, 6 insertions(+)
    >>>>> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
    >>>>> index cca32da05316..9c1f8225c4e1 100644
    >>>>> --- a/drivers/nvme/host/lightnvm.c
    >>>>> +++ b/drivers/nvme/host/lightnvm.c
    >>>>> @@ -318,6 +318,8 @@ static int nvme_nvm_setup_12(struct nvme_nvm_id12 *id,
    >>>>> dev_geo->c.ws_min = sec_per_pg;
    >>>>> dev_geo->c.ws_opt = sec_per_pg;
    >>>>> dev_geo->c.mw_cunits = 8; /* default to MLC safe values */
    >>>>> + dev_geo->c.maxoc = dev_geo->all_luns; /* default to 1 chunk per LUN */
    >>>>> + dev_geo->c.maxocpu = 1; /* default to 1 chunk per LUN */
    >>>>
    >>>> One can't assume that it is 1 open chunk per lun. If you need this for specific hardware, make a quirk for it.
    >>> Which default you want for 1.2 if not specified then? I use 1 because it
    >>> has been the implicit default until now.
    >>
    >> INT_MAX, since it then allows the maximum of open chunks. It cannot be assumed that other 1.2 devices is limited to a single open chunk.
    >
    > So you want the default to be that all blocks on the device can be
    > opened at the same time. Interesting... I guess that such a SSD will
    > have a AA battery attached to it, but fine by me if that's how you want
    > it.

    I feel you're a bit sarcastic here. One may think of SLC and other
    memories that does one-shot programming. In that case no caching is
    needed, and therefore power-caps can be limited on the hardware.

    >
    > Assuming this, can we instead set it to the reported number of chunks,
    > since this is the hard limit anyway.
    >

    Works for me.

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