linux-kernel - Re: [PATCH 08/20] lightnvm: complete geo structure with maxoc*

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Message-ID: <ec5d6c53-c3a1-7d66-9db7-407a519f0feb@lightnvm.io>
Date:   Thu, 22 Feb 2018 10:45:30 +0100
From:   Matias Bjørling <mb@...htnvm.io>
To:     Javier Gonzalez <javier@...xlabs.com>
Cc:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH 08/20] lightnvm: complete geo structure with maxoc*

On 02/22/2018 08:55 AM, Javier Gonzalez wrote:
>> On 22 Feb 2018, at 08.45, Matias Bjørling <mb@...htnvm.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@...xlabs.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.

> 
> Javier
>