diff options
| author | Martin Belanger <martin.belanger@dell.com> | 2022-02-08 14:33:45 -0500 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2022-02-28 13:45:06 +0200 |
| commit | 20d64911e7580f7e29c0086d67860c18307377d7 (patch) | |
| tree | 5d974ba54f77d4783b9eda5d2e40b3f2c401af14 /drivers/nvme/host | |
| parent | 89377bc1975c2993bde4a498a3a4e5817ac0ae2c (diff) | |
nvme: send uevent on connection up
When connectivity with a controller is lost, the driver will keep
trying to reconnect once every 10 sec. When connection is restored,
user-space apps need to be informed so that they can take proper
action. For example, TP8010 introduces the DIM PDU, which is used to
register with a discovery controller (DC). The DIM PDU is sent from
user-space. The DIM PDU must be sent every time a connection is
established with a DC. Therefore, the kernel must tell user-space apps
when connection is restored so that registration can happen.
The uevent sent is a "change" uevent with environmental data
set to: "NVME_EVENT=connected".
Signed-off-by: Martin Belanger <martin.belanger@dell.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: John Meneghini <jmeneghi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme/host')
| -rw-r--r-- | drivers/nvme/host/core.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 5e55732f3ea1..b3e70bb2e6dc 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4262,6 +4262,13 @@ static int nvme_class_uevent(struct device *dev, struct kobj_uevent_env *env) return ret; } +static void nvme_change_uevent(struct nvme_ctrl *ctrl, char *envdata) +{ + char *envp[2] = { envdata, NULL }; + + kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp); +} + static void nvme_aen_uevent(struct nvme_ctrl *ctrl) { char *envp[2] = { NULL, NULL }; @@ -4429,6 +4436,8 @@ void nvme_start_ctrl(struct nvme_ctrl *ctrl) nvme_queue_scan(ctrl); nvme_start_queues(ctrl); } + + nvme_change_uevent(ctrl, "NVME_EVENT=connected"); } EXPORT_SYMBOL_GPL(nvme_start_ctrl); |