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nvme: LightNVM support

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The first generation of Open-Channel SSDs is based on NVMe. The NVMe
driver is extended with support for the LightNVM command set.

Detection is made through PCI IDs. Current supported devices are the
qemu nvme simulator and CNEX Labs Westlake SSD. The qemu nvme enables
support through vendor specific bits in the namespace identification and
the CNEX Labs Westlake SSD implements a LightNVM compatible firmware and
is detected using the same method as qemu.

After detection, vendor specific codes are used to identify the device
and enumerate supported features.

Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Javier González <jg@lightnvm.io>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling
2015-10-29 17:57:29 +09:00
committed by Jens Axboe
parent ae1519ec44
commit ca0640850e
4 changed files with 565 additions and 12 deletions
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39
drivers/nvme/host/pci.c
View File

@@ -1948,6 +1948,9 @@ static void nvme_free_ns(struct kref *kref)
{
struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
if (ns->type == NVME_NS_LIGHTNVM)
nvme_nvm_unregister(ns->queue, ns->disk->disk_name);
spin_lock(&dev_list_lock);
ns->disk->private_data = NULL;
spin_unlock(&dev_list_lock);
@@ -2017,6 +2020,16 @@ static int nvme_revalidate_disk(struct gendisk *disk)
return -ENODEV;
}
if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
if (nvme_nvm_register(ns->queue, disk->disk_name)) {
dev_warn(dev->dev,
"%s: LightNVM init failure\n", __func__);
kfree(id);
return -ENODEV;
}
ns->type = NVME_NS_LIGHTNVM;
}
old_ms = ns->ms;
lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
ns->lba_shift = id->lbaf[lbaf].ds;
@@ -2048,7 +2061,9 @@ static int nvme_revalidate_disk(struct gendisk *disk)
!ns->ext)
nvme_init_integrity(ns);
if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
if ((ns->ms && !(ns->ms == 8 && ns->pi_type) &&
!blk_get_integrity(disk)) ||
ns->type == NVME_NS_LIGHTNVM)
set_capacity(disk, 0);
else
set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
@@ -2171,17 +2186,19 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
goto out_free_disk;
kref_get(&dev->kref);
add_disk(ns->disk);
if (ns->ms) {
struct block_device *bd = bdget_disk(ns->disk, 0);
if (!bd)
return;
if (blkdev_get(bd, FMODE_READ, NULL)) {
bdput(bd);
return;
if (ns->type != NVME_NS_LIGHTNVM) {
add_disk(ns->disk);
if (ns->ms) {
struct block_device *bd = bdget_disk(ns->disk, 0);
if (!bd)
return;
if (blkdev_get(bd, FMODE_READ, NULL)) {
bdput(bd);
return;
}
blkdev_reread_part(bd);
blkdev_put(bd, FMODE_READ);
}
blkdev_reread_part(bd);
blkdev_put(bd, FMODE_READ);
}
return;
out_free_disk: