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nvme: do not detach automatically on hot remove

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The user's remove_cb should detach the NVMe controller when it can
ensure that it is no longer in use.  In the interim (between remove_cb
and spdk_nvme_detach()), the controller will remain in a failed state,
so any new I/O submissions will return an error code but not crash.

examples/nvme/hotplug is not yet updated for this change, but that will
be done in a separate patch.

Change-Id: I8827ba36f9688ccb734e7871f20f11ec11e88f96
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Daniel Verkamp 2016-12-01 11:16:32 -07:00
parent 10690dedcd
commit 13827a74a8
2 changed files with 6 additions and 9 deletions
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6
include/spdk/nvme.h
View File

@ -218,6 +218,12 @@ typedef void (*spdk_nvme_attach_cb)(void *cb_ctx, const struct spdk_nvme_probe_i
* Callback for spdk_nvme_probe() to report that a device attached to the userspace NVMe driver
* has been removed from the system.
*
* The controller will remain in a failed state (any new I/O submitted will fail).
*
* The controller must be detached from the userspace driver by calling spdk_nvme_detach()
* once the controller is no longer in use. It is up to the library user to ensure that
* no other threads are using the controller before calling spdk_nvme_detach().
*
* \param ctrlr NVMe controller instance that was removed.
*/
typedef void (*spdk_nvme_remove_cb)(void *cb_ctx, struct spdk_nvme_ctrlr *ctrlr);

9
lib/nvme/nvme.c
View File

@ -489,7 +489,6 @@ static int
nvme_hotplug_monitor(void *cb_ctx, spdk_nvme_probe_cb probe_cb, spdk_nvme_attach_cb attach_cb,
spdk_nvme_remove_cb remove_cb)
{
int rc = 0;
struct spdk_nvme_ctrlr *ctrlr;
struct spdk_uevent event;
@ -522,14 +521,6 @@ nvme_hotplug_monitor(void *cb_ctx, spdk_nvme_probe_cb probe_cb, spdk_nvme_attach
if (remove_cb) {
remove_cb(cb_ctx, ctrlr);
}
if (spdk_process_is_primary()) {
rc = spdk_nvme_detach(ctrlr);
if (rc) {
SPDK_ERRLOG("Failed to hot detach nvme address: %04x:%04x:%04x.%u\n",
event.pci_addr.domain, event.pci_addr.bus, event.pci_addr.dev,
event.pci_addr.func);
}
}
}
}
}