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NVMe: Use normal shutdown 

The NVMe spec recommends using the shutdown normal sequence when safely
taking the controller offline instead of hitting CC.EN on the next
start-up to reset the controller. The spec recommends a minimum of 1
second for the shutdown complete. This patch waits 2 seconds to be on
the safe side.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Keith Busch 2013-07-15 15:02:22 -06:00 committed by Matthew Wilcox
parent f0b50732a9
commit 1894d8f16a
2 changed files with 28 additions and 0 deletions
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26
drivers/block/nvme-core.c
View File

@ -1221,6 +1221,30 @@ static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap)
return nvme_wait_ready(dev, cap, true);
}
static int nvme_shutdown_ctrl(struct nvme_dev *dev)
{
unsigned long timeout;
u32 cc;
cc = (readl(&dev->bar->cc) & ~NVME_CC_SHN_MASK) | NVME_CC_SHN_NORMAL;
writel(cc, &dev->bar->cc);
timeout = 2 * HZ + jiffies;
while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) !=
NVME_CSTS_SHST_CMPLT) {
msleep(100);
if (fatal_signal_pending(current))
return -EINTR;
if (time_after(jiffies, timeout)) {
dev_err(&dev->pci_dev->dev,
"Device shutdown incomplete; abort shutdown\n");
return -ENODEV;
}
}
return 0;
}
static int nvme_configure_admin_queue(struct nvme_dev *dev)
{
int result;
@ -1943,6 +1967,8 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
list_del_init(&dev->node);
spin_unlock(&dev_list_lock);
if (dev->bar)
nvme_shutdown_ctrl(dev);
nvme_dev_unmap(dev);
}

2
include/linux/nvme.h
View File

@ -53,6 +53,7 @@ enum {
NVME_CC_SHN_NONE = 0 << 14,
NVME_CC_SHN_NORMAL = 1 << 14,
NVME_CC_SHN_ABRUPT = 2 << 14,
NVME_CC_SHN_MASK = 3 << 14,
NVME_CC_IOSQES = 6 << 16,
NVME_CC_IOCQES = 4 << 20,
NVME_CSTS_RDY = 1 << 0,
@ -60,6 +61,7 @@ enum {
NVME_CSTS_SHST_NORMAL = 0 << 2,
NVME_CSTS_SHST_OCCUR = 1 << 2,
NVME_CSTS_SHST_CMPLT = 2 << 2,
NVME_CSTS_SHST_MASK = 3 << 2,
};
#define NVME_VS(major, minor) (major << 16 | minor)