[PATCH v3 3/3] nvme: notify thermal framework when temperature threshold events occur

From: Akinobu Mita <akinobu.mita@gmail.com>
To: linux-nvme@lists.infradead.org, linux-pm@vger.kernel.org
Cc: Akinobu Mita <akinobu.mita@gmail.com>,
	Zhang Rui <rui.zhang@intel.com>,
	Eduardo Valentin <edubezval@gmail.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Keith Busch <keith.busch@intel.com>, Jens Axboe <axboe@fb.com>,
	Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
	Minwoo Im <minwoo.im.dev@gmail.com>,
	Kenneth Heitke <kenneth.heitke@intel.com>,
	Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Subject: [PATCH v3 3/3] nvme: notify thermal framework when temperature threshold events occur
Date: Mon, 27 May 2019 01:29:03 +0900	[thread overview]
Message-ID: <1558888143-5121-4-git-send-email-akinobu.mita@gmail.com> (raw)
In-Reply-To: <1558888143-5121-1-git-send-email-akinobu.mita@gmail.com>

The NVMe controller supports the temperature threshold feature (Feature
Identifier 04h) that enables to configure the asynchronous event request
command to complete when the temperature is crossed its corresponding
temperature threshold.

This enables the reporting of asynchronous events from the controller when
the temperature reached or exceeded a temperature threshold.

In the case of the temperature threshold conditions, this notifies the
thermal framework.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Minwoo Im <minwoo.im.dev@gmail.com>
Cc: Kenneth Heitke <kenneth.heitke@intel.com>
Cc: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
* v3
- No changes since v2

 drivers/nvme/host/core.c | 28 ++++++++++++++++++++++++++++
 include/linux/nvme.h     |  7 +++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 4c8271a..26c8b59 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1186,6 +1186,9 @@ static void nvme_enable_aen(struct nvme_ctrl *ctrl)
 	u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED;
 	int status;
 
+	if (IS_ENABLED(CONFIG_THERMAL))
+		supported_aens |= NVME_SMART_CRIT_TEMPERATURE;
+
 	if (!supported_aens)
 		return;
 
@@ -2470,6 +2473,16 @@ static void nvme_thermal_zones_unregister(struct nvme_ctrl *ctrl)
 	}
 }
 
+static void nvme_thermal_notify_framework(struct nvme_ctrl *ctrl)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ctrl->tzdev); i++) {
+		if (ctrl->tzdev[i])
+			thermal_notify_framework(ctrl->tzdev[i], 0);
+	}
+}
+
 #else
 
 static inline int nvme_thermal_zones_register(struct nvme_ctrl *ctrl)
@@ -2481,6 +2494,10 @@ static inline void nvme_thermal_zones_unregister(struct nvme_ctrl *ctrl)
 {
 }
 
+static void nvme_thermal_notify_framework(struct nvme_ctrl *ctrl)
+{
+}
+
 #endif /* CONFIG_THERMAL */
 
 struct nvme_core_quirk_entry {
@@ -3901,6 +3918,16 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
 }
 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
 
+static void nvme_handle_aen_smart(struct nvme_ctrl *ctrl, u32 result)
+{
+	u32 aer_type = result & NVME_AER_TYPE_MASK;
+	u32 aer_info = (result >> NVME_AER_INFO_SHIFT) & NVME_AER_INFO_MASK;
+
+	if (aer_type == NVME_AER_SMART &&
+	    aer_info == NVME_AER_SMART_TEMP_THRESH)
+		nvme_thermal_notify_framework(ctrl);
+}
+
 static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
 {
 	char *envp[2] = { NULL, NULL };
@@ -3922,6 +3949,7 @@ static void nvme_async_event_work(struct work_struct *work)
 	struct nvme_ctrl *ctrl =
 		container_of(work, struct nvme_ctrl, async_event_work);
 
+	nvme_handle_aen_smart(ctrl, ctrl->aen_result);
 	nvme_aen_uevent(ctrl);
 	ctrl->ops->submit_async_event(ctrl);
 }
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 54f0a13..8e7d599 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -507,6 +507,7 @@ enum {
 };
 
 enum {
+	NVME_AER_TYPE_MASK		= 0x7,
 	NVME_AER_ERROR			= 0,
 	NVME_AER_SMART			= 1,
 	NVME_AER_NOTICE			= 2,
@@ -515,6 +516,12 @@ enum {
 };
 
 enum {
+	NVME_AER_INFO_SHIFT		= 8,
+	NVME_AER_INFO_MASK		= 0xff,
+	NVME_AER_SMART_TEMP_THRESH	= 0x01,
+};
+
+enum {
 	NVME_AER_NOTICE_NS_CHANGED	= 0x00,
 	NVME_AER_NOTICE_FW_ACT_STARTING = 0x01,
 	NVME_AER_NOTICE_ANA		= 0x03,
-- 
2.7.4

