NVMe: Correct the Controller Configuration settings

The arbitration field was extended by one bit, shifting the shutdown
notification bits by one.  Also, the SQ/CQ entry size was made
configurable for future extensions.
Reported-by: Paul Luse <paul.e.luse@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

drivers/block/nvme.c

@@ -905,6 +905,7 @@ static int __devinit nvme_configure_admin_queue(struct nvme_dev *dev)
 	dev->ctrl_config = NVME_CC_ENABLE | NVME_CC_CSS_NVM;
 	dev->ctrl_config |= (PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT;
 	dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
+	dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
 
 	writel(0, &dev->bar->cc);
 	writel(aqa, &dev->bar->aqa);

include/linux/nvme.h

@@ -41,10 +41,12 @@ enum {
 	NVME_CC_MPS_SHIFT	= 7,
 	NVME_CC_ARB_RR		= 0 << 11,
 	NVME_CC_ARB_WRRU	= 1 << 11,
-	NVME_CC_ARB_VS		= 3 << 11,
-	NVME_CC_SHN_NONE	= 0 << 13,
-	NVME_CC_SHN_NORMAL	= 1 << 13,
-	NVME_CC_SHN_ABRUPT	= 2 << 13,
+	NVME_CC_ARB_VS		= 7 << 11,
+	NVME_CC_SHN_NONE	= 0 << 14,
+	NVME_CC_SHN_NORMAL	= 1 << 14,
+	NVME_CC_SHN_ABRUPT	= 2 << 14,
+	NVME_CC_IOSQES		= 6 << 16,
+	NVME_CC_IOCQES		= 4 << 20,
 	NVME_CSTS_RDY		= 1 << 0,
 	NVME_CSTS_CFS		= 1 << 1,
 	NVME_CSTS_SHST_NORMAL	= 0 << 2,