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NVMe: Add nvme subsystem reset support

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Controllers part of an NVMe subsystem may be reset by any other controller
in the subsystem. If the device is capable of subsystem resets, this
patch adds detection for such events and performs appropriate controller
initialization upon subsystem reset detection.

The register bit is a RW1C type, so the driver needs to write a 1 to the
status bit to clear the subsystem reset occured bit during initialization.

Signed-off-by: Keith Busch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Keith Busch 2015-08-10 15:20:40 -06:00 • committed by Jens Axboe
commit dfbac8c7ac
2 changed files with 13 additions and 1 deletions
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11
drivers/block/nvme-core.c
View file

@ -1735,6 +1735,12 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev)
page_shift = dev_page_max;
}
dev->subsystem = readl(&dev->bar->vs) >= NVME_VS(1, 1) ?
NVME_CAP_NSSRC(cap) : 0;
if (dev->subsystem && (readl(&dev->bar->csts) & NVME_CSTS_NSSRO))
writel(NVME_CSTS_NSSRO, &dev->bar->csts);
result = nvme_disable_ctrl(dev, cap);
if (result < 0)
return result;
@ -2059,7 +2065,10 @@ static int nvme_kthread(void *data)
spin_lock(&dev_list_lock);
list_for_each_entry_safe(dev, next, &dev_list, node) {
int i;
if (readl(&dev->bar->csts) & NVME_CSTS_CFS) {
u32 csts = readl(&dev->bar->csts);
if ((dev->subsystem && (csts & NVME_CSTS_NSSRO)) ||
csts & NVME_CSTS_CFS) {
if (work_busy(&dev->reset_work))
continue;
list_del_init(&dev->node);