linux-block.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Christoph Hellwig <hch@lst.de>
To: mb@lightnvm.io, axboe@kernel.dk, javier@javigon.com
Cc: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org
Subject: [PATCH] lightnvm: deprecated OCSSD support and schedule it for removal in Linux 5.15
Date: Mon, 12 Apr 2021 10:12:57 +0200	[thread overview]
Message-ID: <20210412081257.2585860-1-hch@lst.de> (raw)

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@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;
-- 
2.30.1


             reply	other threads:[~2021-04-12  8:13 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-12  8:12 Christoph Hellwig [this message]
2021-04-12  9:21 ` [PATCH] lightnvm: deprecated OCSSD support and schedule it for removal in Linux 5.15 Matias Bjørling
2021-04-12  9:26   ` Matias Bjørling
2021-04-12  9:49     ` Javier González
2021-04-12 10:20       ` Matias Bjørling
2021-04-12 11:20         ` Hans Holmberg

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210412081257.2585860-1-hch@lst.de \
    --to=hch@lst.de \
    --cc=axboe@kernel.dk \
    --cc=javier@javigon.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-nvme@lists.infradead.org \
    --cc=mb@lightnvm.io \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).