diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 12357d616eebb6c3d9978466a9a0be9964648cfe..a7c6e9d749434ef36453dcaa5bac0b9b8023291a 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -99,6 +99,7 @@ struct nvme_dev {
 	dma_addr_t cmb_dma_addr;
 	u64 cmb_size;
 	u32 cmbsz;
+	u32 cmbloc;
 	struct nvme_ctrl ctrl;
 	struct completion ioq_wait;
 };
@@ -1330,28 +1331,37 @@ static int nvme_create_io_queues(struct nvme_dev *dev)
 	return ret >= 0 ? 0 : ret;
 }
 
+static ssize_t nvme_cmb_show(struct device *dev,
+			     struct device_attribute *attr,
+			     char *buf)
+{
+	struct nvme_dev *ndev = to_nvme_dev(dev_get_drvdata(dev));
+
+	return snprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz  : x%08x\n",
+		       ndev->cmbloc, ndev->cmbsz);
+}
+static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL);
+
 static void __iomem *nvme_map_cmb(struct nvme_dev *dev)
 {
 	u64 szu, size, offset;
-	u32 cmbloc;
 	resource_size_t bar_size;
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	void __iomem *cmb;
 	dma_addr_t dma_addr;
 
-	if (!use_cmb_sqes)
-		return NULL;
-
 	dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ);
 	if (!(NVME_CMB_SZ(dev->cmbsz)))
 		return NULL;
+	dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC);
 
-	cmbloc = readl(dev->bar + NVME_REG_CMBLOC);
+	if (!use_cmb_sqes)
+		return NULL;
 
 	szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz));
 	size = szu * NVME_CMB_SZ(dev->cmbsz);
-	offset = szu * NVME_CMB_OFST(cmbloc);
-	bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc));
+	offset = szu * NVME_CMB_OFST(dev->cmbloc);
+	bar_size = pci_resource_len(pdev, NVME_CMB_BIR(dev->cmbloc));
 
 	if (offset > bar_size)
 		return NULL;
@@ -1364,7 +1374,7 @@ static void __iomem *nvme_map_cmb(struct nvme_dev *dev)
 	if (size > bar_size - offset)
 		size = bar_size - offset;
 
-	dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset;
+	dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(dev->cmbloc)) + offset;
 	cmb = ioremap_wc(dma_addr, size);
 	if (!cmb)
 		return NULL;
@@ -1615,9 +1625,25 @@ static int nvme_pci_enable(struct nvme_dev *dev)
 			dev->q_depth);
 	}
 
-	if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2))
+	/*
+	 * CMBs can currently only exist on >=1.2 PCIe devices. We only
+	 * populate sysfs if a CMB is implemented. Note that we add the
+	 * CMB attribute to the nvme_ctrl kobj which removes the need to remove
+	 * it on exit. Since nvme_dev_attrs_group has no name we can pass
+	 * NULL as final argument to sysfs_add_file_to_group.
+	 */
+
+	if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2)) {
 		dev->cmb = nvme_map_cmb(dev);
 
+		if (dev->cmbsz) {
+			if (sysfs_add_file_to_group(&dev->ctrl.device->kobj,
+						    &dev_attr_cmb.attr, NULL))
+				dev_warn(dev->dev,
+					 "failed to add sysfs attribute for CMB\n");
+		}
+	}
+
 	pci_enable_pcie_error_reporting(pdev);
 	pci_save_state(pdev);
 	return 0;