linux-kernel - [RFC PATCH 05/14] nvmet: Send an AEN on CCR completion

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Message-ID: <20251126021250.2583630-6-mkhalfella@purestorage.com>
Date: Tue, 25 Nov 2025 18:11:52 -0800
From: Mohamed Khalfella <mkhalfella@...estorage.com>
To: Chaitanya Kulkarni <kch@...dia.com>,
	Christoph Hellwig <hch@....de>,
	Jens Axboe <axboe@...nel.dk>,
	Keith Busch <kbusch@...nel.org>,
	Sagi Grimberg <sagi@...mberg.me>
Cc: Aaron Dailey <adailey@...estorage.com>,
	Randy Jennings <randyj@...estorage.com>,
	John Meneghini <jmeneghi@...hat.com>,
	Hannes Reinecke <hare@...e.de>,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Mohamed Khalfella <mkhalfella@...estorage.com>
Subject: [RFC PATCH 05/14] nvmet: Send an AEN on CCR completion

Send an AEN to initiator when impacted controller exists. The
notification points to CCR log page that initiator can read to check
which CCR operation completed.

Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
---
 drivers/nvme/target/core.c  | 27 +++++++++++++++++++++++----
 drivers/nvme/target/nvmet.h |  3 ++-
 include/linux/nvme.h        |  3 +++
 3 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 7dbe9255ff42..60173833c3eb 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -202,7 +202,7 @@ static void nvmet_async_event_work(struct work_struct *work)
 	nvmet_async_events_process(ctrl);
 }
 
-void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
+static void nvmet_add_async_event_locked(struct nvmet_ctrl *ctrl, u8 event_type,
 		u8 event_info, u8 log_page)
 {
 	struct nvmet_async_event *aen;
@@ -215,12 +215,17 @@ void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
 	aen->event_info = event_info;
 	aen->log_page = log_page;
 
-	mutex_lock(&ctrl->lock);
 	list_add_tail(&aen->entry, &ctrl->async_events);
-	mutex_unlock(&ctrl->lock);
 
 	queue_work(nvmet_wq, &ctrl->async_event_work);
 }
+void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
+		u8 event_info, u8 log_page)
+{
+	mutex_lock(&ctrl->lock);
+	nvmet_add_async_event_locked(ctrl, event_type, event_info, log_page);
+	mutex_unlock(&ctrl->lock);
+}
 
 static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid)
 {
@@ -1788,6 +1793,18 @@ struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args)
 }
 EXPORT_SYMBOL_GPL(nvmet_alloc_ctrl);
 
+static void nvmet_ctrl_notify_ccr(struct nvmet_ctrl *ctrl)
+{
+	lockdep_assert_held(&ctrl->lock);
+
+	if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_CCR_COMPLETE))
+		return;
+
+	nvmet_add_async_event_locked(ctrl, NVME_AER_NOTICE,
+				     NVME_AER_NOTICE_CCR_COMPLETED,
+				     NVME_LOG_CCR);
+}
+
 static void nvmet_ctrl_complete_pending_ccr(struct nvmet_ctrl *ctrl)
 {
 	struct nvmet_subsys *subsys = ctrl->subsys;
@@ -1801,8 +1818,10 @@ static void nvmet_ctrl_complete_pending_ccr(struct nvmet_ctrl *ctrl)
 	list_for_each_entry(sctrl, &subsys->ctrls, subsys_entry) {
 		mutex_lock(&sctrl->lock);
 		list_for_each_entry(ccr, &sctrl->ccrs, entry) {
-			if (ccr->ctrl == ctrl)
+			if (ccr->ctrl == ctrl) {
+				nvmet_ctrl_notify_ccr(sctrl);
 				ccr->ctrl = NULL;
+			}
 		}
 		mutex_unlock(&sctrl->lock);
 	}
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 6c0091b8af8b..7ebcef13be2b 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -44,7 +44,8 @@
  * Supported optional AENs:
  */
 #define NVMET_AEN_CFG_OPTIONAL \
-	(NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_ANA_CHANGE)
+	(NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_ANA_CHANGE | \
+	 NVME_AEN_CFG_CCR_COMPLETE)
 #define NVMET_DISC_AEN_CFG_OPTIONAL \
 	(NVME_AEN_CFG_DISC_CHANGE)
 
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index d51883122d65..a145417dccd3 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -863,12 +863,14 @@ enum {
 	NVME_AER_NOTICE_FW_ACT_STARTING = 0x01,
 	NVME_AER_NOTICE_ANA		= 0x03,
 	NVME_AER_NOTICE_DISC_CHANGED	= 0xf0,
+	NVME_AER_NOTICE_CCR_COMPLETED	= 0xf4,
 };
 
 enum {
 	NVME_AEN_BIT_NS_ATTR		= 8,
 	NVME_AEN_BIT_FW_ACT		= 9,
 	NVME_AEN_BIT_ANA_CHANGE		= 11,
+	NVME_AEN_BIT_CCR_COMPLETE	= 20,
 	NVME_AEN_BIT_DISC_CHANGE	= 31,
 };
 
@@ -876,6 +878,7 @@ enum {
 	NVME_AEN_CFG_NS_ATTR		= 1 << NVME_AEN_BIT_NS_ATTR,
 	NVME_AEN_CFG_FW_ACT		= 1 << NVME_AEN_BIT_FW_ACT,
 	NVME_AEN_CFG_ANA_CHANGE		= 1 << NVME_AEN_BIT_ANA_CHANGE,
+	NVME_AEN_CFG_CCR_COMPLETE	= 1 << NVME_AEN_BIT_CCR_COMPLETE,
 	NVME_AEN_CFG_DISC_CHANGE	= 1 << NVME_AEN_BIT_DISC_CHANGE,
 };
 
-- 
2.51.2