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nvme: send uevent for some asynchronous events 

This will give udev a chance to observe and handle asynchronous event
notifications and clear the log to unmask future events of the same type.
The driver will create a change uevent of the asyncronuos event result
before submitting the next AEN request to the device if a completed AEN
event is of type error, smart, command set or vendor specific,

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Guan Junxiong <guanjunxiong@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2017-11-07 15:13:14 -07:00 committed by Jens Axboe
parent d99ca609a1
commit e3d7874dcf
3 changed files with 33 additions and 0 deletions
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28
drivers/nvme/host/core.c
View File

@ -2665,11 +2665,28 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
}
EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
{
char *envp[2] = { NULL, NULL };
u32 aen_result = ctrl->aen_result;
ctrl->aen_result = 0;
if (!aen_result)
return;
envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
if (!envp[0])
return;
kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
kfree(envp[0]);
}
static void nvme_async_event_work(struct work_struct *work)
{
struct nvme_ctrl *ctrl =
container_of(work, struct nvme_ctrl, async_event_work);
nvme_aen_uevent(ctrl);
ctrl->ops->submit_async_event(ctrl);
}
@ -2741,6 +2758,17 @@ void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
return;
switch (result & 0x7) {
case NVME_AER_ERROR:
case NVME_AER_SMART:
case NVME_AER_CSS:
case NVME_AER_VS:
ctrl->aen_result = result;
break;
default:
break;
}
switch (result & 0xff07) {
case NVME_AER_NOTICE_NS_CHANGED:
dev_info(ctrl->device, "rescanning\n");

1
drivers/nvme/host/nvme.h
View File

@ -168,6 +168,7 @@ struct nvme_ctrl {
u16 kas;
u8 npss;
u8 apsta;
u32 aen_result;
unsigned int shutdown_timeout;
unsigned int kato;
bool subsystem;

4
include/linux/nvme.h
View File

@ -428,6 +428,10 @@ enum {
};
enum {
NVME_AER_ERROR = 0,
NVME_AER_SMART = 1,
NVME_AER_CSS = 6,
NVME_AER_VS = 7,
NVME_AER_NOTICE_NS_CHANGED = 0x0002,
NVME_AER_NOTICE_FW_ACT_STARTING = 0x0102,
};