[PATCH] lightnvm: deprecated OCSSD support and schedule it for removal in Linux 5.15
Matias Bjørling
mb at lightnvm.io
Mon Apr 12 11:20:20 BST 2021
On 12/04/2021 11.49, Javier González wrote:
> On 12.04.2021 11:26, Matias Bjørling wrote:
>> On 12/04/2021 11.21, Matias Bjørling wrote:
>>> On 12/04/2021 10.12, Christoph Hellwig wrote:
>>>> Lightnvm was an innovative idea to expose more low-level control
>>>> over SSDs.
>>>> But it failed to get properly standardized and remains a
>>>> non-standarized
>>>> extension to NVMe that requires vendor specific quirks for a few
>>>> now mostly
>>>> obsolete SSD devices. The standardized ZNS command set for NVMe
>>>> has take
>>>> over a lot of the approaches and allows for fully standardized
>>>> operation.
>>>>
>>>> Remove the Linux code to support open channel SSDs as the few
>>>> production
>>>> deployments of the above mentioned SSDs are using userspace driver
>>>> stacks
>>>> instead of the fairly limited Linux support.
>>>>
>>>> Signed-off-by: Christoph Hellwig <hch at lst.de>
>>>> ---
>>>> drivers/lightnvm/Kconfig | 4 +++-
>>>> drivers/lightnvm/core.c | 2 ++
>>>> 2 files changed, 5 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig
>>>> index 4c2ce210c1237d..04caa0f2d445c7 100644
>>>> --- a/drivers/lightnvm/Kconfig
>>>> +++ b/drivers/lightnvm/Kconfig
>>>> @@ -4,7 +4,7 @@
>>>> #
>>>> menuconfig NVM
>>>> - bool "Open-Channel SSD target support"
>>>> + bool "Open-Channel SSD target support (DEPRECATED)"
>>>> depends on BLOCK
>>>> help
>>>> Say Y here to get to enable Open-channel SSDs.
>>>> @@ -15,6 +15,8 @@ menuconfig NVM
>>>> If you say N, all options in this submenu will be skipped
>>>> and disabled
>>>> only do this if you know what you are doing.
>>>> + This code is deprecated and will be removed in Linux 5.15.
>>>> +
>>>> if NVM
>>>> config NVM_PBLK
>>>> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
>>>> index 28ddcaa5358b14..4394f47c81296a 100644
>>>> --- a/drivers/lightnvm/core.c
>>>> +++ b/drivers/lightnvm/core.c
>>>> @@ -1174,6 +1174,8 @@ int nvm_register(struct nvm_dev *dev)
>>>> {
>>>> int ret, exp_pool_size;
>>>> + pr_warn_once("lightnvm support is deprecated and will be
>>>> removed in Linux 5.15.\n");
>>>> +
>>>> if (!dev->q || !dev->ops) {
>>>> kref_put(&dev->ref, nvm_free);
>>>> return -EINVAL;
>>>
>>> Thanks, Christoph.
>>>
>>> I'll send it to Jens with today's lightnvm PR.
>>
>> Javier, can I add your reviewed-by?
>>
>
> Yes, please.
>
> I'll crack a beer and cheer on it tonight. Good times :)
>
> Javier
Thank you.
More information about the Linux-nvme
mailing list