diff --git a/drivers/nvme/target/Kconfig b/drivers/nvme/target/Kconfig
index 46be031f91b4..e323e886e8a6 100644
--- a/drivers/nvme/target/Kconfig
+++ b/drivers/nvme/target/Kconfig
@@ -115,3 +115,13 @@ config NVME_TARGET_AUTH
 	  target side.
 
 	  If unsure, say N.
+
+config NVME_TARGET_PCI_EPF
+	tristate "NVMe PCI Endpoint Function target support"
+	depends on NVME_TARGET && PCI_ENDPOINT
+	help
+	  This enables the NVMe PCI Endpoint Function target driver support,
+	  which allows creating a NVMe PCI controller using an endpoint mode
+	  capable PCI controller.
+
+	  If unsure, say N.
diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
index f2b025bbe10c..ed8522911d1f 100644
--- a/drivers/nvme/target/Makefile
+++ b/drivers/nvme/target/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_NVME_TARGET_RDMA)		+= nvmet-rdma.o
 obj-$(CONFIG_NVME_TARGET_FC)		+= nvmet-fc.o
 obj-$(CONFIG_NVME_TARGET_FCLOOP)	+= nvme-fcloop.o
 obj-$(CONFIG_NVME_TARGET_TCP)		+= nvmet-tcp.o
+obj-$(CONFIG_NVME_TARGET_PCI_EPF)	+= nvmet-pci-epf.o
 
 nvmet-y		+= core.o configfs.o admin-cmd.o fabrics-cmd.o \
 			discovery.o io-cmd-file.o io-cmd-bdev.o pr.o
@@ -20,4 +21,5 @@ nvmet-rdma-y	+= rdma.o
 nvmet-fc-y	+= fc.o
 nvme-fcloop-y	+= fcloop.o
 nvmet-tcp-y	+= tcp.o
+nvmet-pci-epf-y	+= pci-epf.o
 nvmet-$(CONFIG_TRACING)	+= trace.o
diff --git a/drivers/nvme/target/pci-epf.c b/drivers/nvme/target/pci-epf.c
new file mode 100644
index 000000000000..ac30b42cc622
--- /dev/null
+++ b/drivers/nvme/target/pci-epf.c
@@ -0,0 +1,2591 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NVMe PCI Endpoint Function target driver.
+ *
+ * Copyright (c) 2024, Western Digital Corporation or its affiliates.
+ * Copyright (c) 2024, Rick Wertenbroek <rick.wertenbroek@gmail.com>
+ *                     REDS Institute, HEIG-VD, HES-SO, Switzerland
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/io.h>
+#include <linux/mempool.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/nvme.h>
+#include <linux/pci_ids.h>
+#include <linux/pci-epc.h>
+#include <linux/pci-epf.h>
+#include <linux/pci_regs.h>
+#include <linux/slab.h>
+
+#include "nvmet.h"
+
+static LIST_HEAD(nvmet_pci_epf_ports);
+static DEFINE_MUTEX(nvmet_pci_epf_ports_mutex);
+
+/*
+ * Default and maximum allowed data transfer size. For the default,
+ * allow up to 128 page-sized segments. For the maximum allowed,
+ * use 4 times the default (which is completely arbitrary).
+ */
+#define NVMET_PCI_EPF_MAX_SEGS		128
+#define NVMET_PCI_EPF_MDTS_KB		\
+	(NVMET_PCI_EPF_MAX_SEGS << (PAGE_SHIFT - 10))
+#define NVMET_PCI_EPF_MAX_MDTS_KB	(NVMET_PCI_EPF_MDTS_KB * 4)
+
+/*
+ * IRQ vector coalescing threshold: by default, post 8 CQEs before raising an
+ * interrupt vector to the host. This default 8 is completely arbitrary and can
+ * be changed by the host with a nvme_set_features command.
+ */
+#define NVMET_PCI_EPF_IV_THRESHOLD	8
+
+/*
+ * BAR CC register and SQ polling intervals.
+ */
+#define NVMET_PCI_EPF_CC_POLL_INTERVAL	msecs_to_jiffies(5)
+#define NVMET_PCI_EPF_SQ_POLL_INTERVAL	msecs_to_jiffies(5)
+#define NVMET_PCI_EPF_SQ_POLL_IDLE	msecs_to_jiffies(5000)
+
+/*
+ * SQ arbitration burst default: fetch at most 8 commands at a time from an SQ.
+ */
+#define NVMET_PCI_EPF_SQ_AB		8
+
+/*
+ * Handling of CQs is normally immediate, unless we fail to map a CQ or the CQ
+ * is full, in which case we retry the CQ processing after this interval.
+ */
+#define NVMET_PCI_EPF_CQ_RETRY_INTERVAL	msecs_to_jiffies(1)
+
+enum nvmet_pci_epf_queue_flags {
+	NVMET_PCI_EPF_Q_IS_SQ = 0,	/* The queue is a submission queue */
+	NVMET_PCI_EPF_Q_LIVE,		/* The queue is live */
+	NVMET_PCI_EPF_Q_IRQ_ENABLED,	/* IRQ is enabled for this queue */
+};
+
+/*
+ * IRQ vector descriptor.
+ */
+struct nvmet_pci_epf_irq_vector {
+	unsigned int	vector;
+	unsigned int	ref;
+	bool		cd;
+	int		nr_irqs;
+};
+
+struct nvmet_pci_epf_queue {
+	union {
+		struct nvmet_sq		nvme_sq;
+		struct nvmet_cq		nvme_cq;
+	};
+	struct nvmet_pci_epf_ctrl	*ctrl;
+	unsigned long			flags;
+
+	u64				pci_addr;
+	size_t				pci_size;
+	struct pci_epc_map		pci_map;
+
+	u16				qid;
+	u16				depth;
+	u16				vector;
+	u16				head;
+	u16				tail;
+	u16				phase;
+	u32				db;
+
+	size_t				qes;
+
+	struct nvmet_pci_epf_irq_vector	*iv;
+	struct workqueue_struct		*iod_wq;
+	struct delayed_work		work;
+	spinlock_t			lock;
+	struct list_head		list;
+};
+
+/*
+ * PCI Root Complex (RC) address data segment for mapping an admin or
+ * I/O command buffer @buf of @length bytes to the PCI address @pci_addr.
+ */
+struct nvmet_pci_epf_segment {
+	void				*buf;
+	u64				pci_addr;
+	u32				length;
+};
+
+/*
+ * Command descriptors.
+ */
+struct nvmet_pci_epf_iod {
+	struct list_head		link;
+
+	struct nvmet_req		req;
+	struct nvme_command		cmd;
+	struct nvme_completion		cqe;
+	unsigned int			status;
+
+	struct nvmet_pci_epf_ctrl	*ctrl;
+
+	struct nvmet_pci_epf_queue	*sq;
+	struct nvmet_pci_epf_queue	*cq;
+
+	/* Data transfer size and direction for the command. */
+	size_t				data_len;
+	enum dma_data_direction		dma_dir;
+
+	/*
+	 * PCI Root Complex (RC) address data segments: if nr_data_segs is 1, we
+	 * use only @data_seg. Otherwise, the array of segments @data_segs is
+	 * allocated to manage multiple PCI address data segments. @data_sgl and
+	 * @data_sgt are used to setup the command request for execution by the
+	 * target core.
+	 */
+	unsigned int			nr_data_segs;
+	struct nvmet_pci_epf_segment	data_seg;
+	struct nvmet_pci_epf_segment	*data_segs;
+	struct scatterlist		data_sgl;
+	struct sg_table			data_sgt;
+
+	struct work_struct		work;
+	struct completion		done;
+};
+
+/*
+ * PCI target controller private data.
+ */
+struct nvmet_pci_epf_ctrl {
+	struct nvmet_pci_epf		*nvme_epf;
+	struct nvmet_port		*port;
+	struct nvmet_ctrl		*tctrl;
+	struct device			*dev;
+
+	unsigned int			nr_queues;
+	struct nvmet_pci_epf_queue	*sq;
+	struct nvmet_pci_epf_queue	*cq;
+	unsigned int			sq_ab;
+
+	mempool_t			iod_pool;
+	void				*bar;
+	u64				cap;
+	u32				cc;
+	u32				csts;
+
+	size_t				io_sqes;
+	size_t				io_cqes;
+
+	size_t				mps_shift;
+	size_t				mps;
+	size_t				mps_mask;
+
+	unsigned int			mdts;
+
+	struct delayed_work		poll_cc;
+	struct delayed_work		poll_sqs;
+
+	struct mutex			irq_lock;
+	struct nvmet_pci_epf_irq_vector	*irq_vectors;
+	unsigned int			irq_vector_threshold;
+
+	bool				link_up;
+	bool				enabled;
+};
+
+/*
+ * PCI EPF driver private data.
+ */
+struct nvmet_pci_epf {
+	struct pci_epf			*epf;
+
+	const struct pci_epc_features	*epc_features;
+
+	void				*reg_bar;
+	size_t				msix_table_offset;
+
+	unsigned int			irq_type;
+	unsigned int			nr_vectors;
+
+	struct nvmet_pci_epf_ctrl	ctrl;
+
+	bool				dma_enabled;
+	struct dma_chan			*dma_tx_chan;
+	struct mutex			dma_tx_lock;
+	struct dma_chan			*dma_rx_chan;
+	struct mutex			dma_rx_lock;
+
+	struct mutex			mmio_lock;
+
+	/* PCI endpoint function configfs attributes. */
+	struct config_group		group;
+	__le16				portid;
+	char				subsysnqn[NVMF_NQN_SIZE];
+	unsigned int			mdts_kb;
+};
+
+static inline u32 nvmet_pci_epf_bar_read32(struct nvmet_pci_epf_ctrl *ctrl,
+					   u32 off)
+{
+	__le32 *bar_reg = ctrl->bar + off;
+
+	return le32_to_cpu(READ_ONCE(*bar_reg));
+}
+
+static inline void nvmet_pci_epf_bar_write32(struct nvmet_pci_epf_ctrl *ctrl,
+					     u32 off, u32 val)
+{
+	__le32 *bar_reg = ctrl->bar + off;
+
+	WRITE_ONCE(*bar_reg, cpu_to_le32(val));
+}
+
+static inline u64 nvmet_pci_epf_bar_read64(struct nvmet_pci_epf_ctrl *ctrl,
+					   u32 off)
+{
+	return (u64)nvmet_pci_epf_bar_read32(ctrl, off) |
+		((u64)nvmet_pci_epf_bar_read32(ctrl, off + 4) << 32);
+}
+
+static inline void nvmet_pci_epf_bar_write64(struct nvmet_pci_epf_ctrl *ctrl,
+					     u32 off, u64 val)
+{
+	nvmet_pci_epf_bar_write32(ctrl, off, val & 0xFFFFFFFF);
+	nvmet_pci_epf_bar_write32(ctrl, off + 4, (val >> 32) & 0xFFFFFFFF);
+}
+
+static inline int nvmet_pci_epf_mem_map(struct nvmet_pci_epf *nvme_epf,
+		u64 pci_addr, size_t size, struct pci_epc_map *map)
+{
+	struct pci_epf *epf = nvme_epf->epf;
+
+	return pci_epc_mem_map(epf->epc, epf->func_no, epf->vfunc_no,
+			       pci_addr, size, map);
+}
+
+static inline void nvmet_pci_epf_mem_unmap(struct nvmet_pci_epf *nvme_epf,
+					   struct pci_epc_map *map)
+{
+	struct pci_epf *epf = nvme_epf->epf;
+
+	pci_epc_mem_unmap(epf->epc, epf->func_no, epf->vfunc_no, map);
+}
+
+struct nvmet_pci_epf_dma_filter {
+	struct device *dev;
+	u32 dma_mask;
+};
+
+static bool nvmet_pci_epf_dma_filter(struct dma_chan *chan, void *arg)
+{
+	struct nvmet_pci_epf_dma_filter *filter = arg;
+	struct dma_slave_caps caps;
+
+	memset(&caps, 0, sizeof(caps));
+	dma_get_slave_caps(chan, &caps);
+
+	return chan->device->dev == filter->dev &&
+		(filter->dma_mask & caps.directions);
+}
+
+static void nvmet_pci_epf_init_dma(struct nvmet_pci_epf *nvme_epf)
+{
+	struct pci_epf *epf = nvme_epf->epf;
+	struct device *dev = &epf->dev;
+	struct nvmet_pci_epf_dma_filter filter;
+	struct dma_chan *chan;
+	dma_cap_mask_t mask;
+
+	mutex_init(&nvme_epf->dma_rx_lock);
+	mutex_init(&nvme_epf->dma_tx_lock);
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+
+	filter.dev = epf->epc->dev.parent;
+	filter.dma_mask = BIT(DMA_DEV_TO_MEM);
+
+	chan = dma_request_channel(mask, nvmet_pci_epf_dma_filter, &filter);
+	if (!chan)
+		goto out_dma_no_rx;
+
+	nvme_epf->dma_rx_chan = chan;
+
+	filter.dma_mask = BIT(DMA_MEM_TO_DEV);
+	chan = dma_request_channel(mask, nvmet_pci_epf_dma_filter, &filter);
+	if (!chan)
+		goto out_dma_no_tx;
+
+	nvme_epf->dma_tx_chan = chan;
+
+	nvme_epf->dma_enabled = true;
+
+	dev_dbg(dev, "Using DMA RX channel %s, maximum segment size %u B\n",
+		dma_chan_name(chan),
+		dma_get_max_seg_size(dmaengine_get_dma_device(chan)));
+
+	dev_dbg(dev, "Using DMA TX channel %s, maximum segment size %u B\n",
+		dma_chan_name(chan),
+		dma_get_max_seg_size(dmaengine_get_dma_device(chan)));
+
+	return;
+
+out_dma_no_tx:
+	dma_release_channel(nvme_epf->dma_rx_chan);
+	nvme_epf->dma_rx_chan = NULL;
+
+out_dma_no_rx:
+	mutex_destroy(&nvme_epf->dma_rx_lock);
+	mutex_destroy(&nvme_epf->dma_tx_lock);
+	nvme_epf->dma_enabled = false;
+
+	dev_info(&epf->dev, "DMA not supported, falling back to MMIO\n");
+}
+
+static void nvmet_pci_epf_deinit_dma(struct nvmet_pci_epf *nvme_epf)
+{
+	if (!nvme_epf->dma_enabled)
+		return;
+
+	dma_release_channel(nvme_epf->dma_tx_chan);
+	nvme_epf->dma_tx_chan = NULL;
+	dma_release_channel(nvme_epf->dma_rx_chan);
+	nvme_epf->dma_rx_chan = NULL;
+	mutex_destroy(&nvme_epf->dma_rx_lock);
+	mutex_destroy(&nvme_epf->dma_tx_lock);
+	nvme_epf->dma_enabled = false;
+}
+
+static int nvmet_pci_epf_dma_transfer(struct nvmet_pci_epf *nvme_epf,
+		struct nvmet_pci_epf_segment *seg, enum dma_data_direction dir)
+{
+	struct pci_epf *epf = nvme_epf->epf;
+	struct dma_async_tx_descriptor *desc;
+	struct dma_slave_config sconf = {};
+	struct device *dev = &epf->dev;
+	struct device *dma_dev;
+	struct dma_chan *chan;
+	dma_cookie_t cookie;
+	dma_addr_t dma_addr;
+	struct mutex *lock;
+	int ret;
+
+	switch (dir) {
+	case DMA_FROM_DEVICE:
+		lock = &nvme_epf->dma_rx_lock;
+		chan = nvme_epf->dma_rx_chan;
+		sconf.direction = DMA_DEV_TO_MEM;
+		sconf.src_addr = seg->pci_addr;
+		break;
+	case DMA_TO_DEVICE:
+		lock = &nvme_epf->dma_tx_lock;
+		chan = nvme_epf->dma_tx_chan;
+		sconf.direction = DMA_MEM_TO_DEV;
+		sconf.dst_addr = seg->pci_addr;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(lock);
+
+	dma_dev = dmaengine_get_dma_device(chan);
+	dma_addr = dma_map_single(dma_dev, seg->buf, seg->length, dir);
+	ret = dma_mapping_error(dma_dev, dma_addr);
+	if (ret)
+		goto unlock;
+
+	ret = dmaengine_slave_config(chan, &sconf);
+	if (ret) {
+		dev_err(dev, "Failed to configure DMA channel\n");
+		goto unmap;
+	}
+
+	desc = dmaengine_prep_slave_single(chan, dma_addr, seg->length,
+					   sconf.direction, DMA_CTRL_ACK);
+	if (!desc) {
+		dev_err(dev, "Failed to prepare DMA\n");
+		ret = -EIO;
+		goto unmap;
+	}
+
+	cookie = dmaengine_submit(desc);
+	ret = dma_submit_error(cookie);
+	if (ret) {
+		dev_err(dev, "Failed to do DMA submit (err=%d)\n", ret);
+		goto unmap;
+	}
+
+	if (dma_sync_wait(chan, cookie) != DMA_COMPLETE) {
+		dev_err(dev, "DMA transfer failed\n");
+		ret = -EIO;
+	}
+
+	dmaengine_terminate_sync(chan);
+
+unmap:
+	dma_unmap_single(dma_dev, dma_addr, seg->length, dir);
+
+unlock:
+	mutex_unlock(lock);
+
+	return ret;
+}
+
+static int nvmet_pci_epf_mmio_transfer(struct nvmet_pci_epf *nvme_epf,
+		struct nvmet_pci_epf_segment *seg, enum dma_data_direction dir)
+{
+	u64 pci_addr = seg->pci_addr;
+	u32 length = seg->length;
+	void *buf = seg->buf;
+	struct pci_epc_map map;
+	int ret = -EINVAL;
+
+	/*
+	 * Note: MMIO transfers do not need serialization but this is a
+	 * simple way to avoid using too many mapping windows.
+	 */
+	mutex_lock(&nvme_epf->mmio_lock);
+
+	while (length) {
+		ret = nvmet_pci_epf_mem_map(nvme_epf, pci_addr, length, &map);
+		if (ret)
+			break;
+
+		switch (dir) {
+		case DMA_FROM_DEVICE:
+			memcpy_fromio(buf, map.virt_addr, map.pci_size);
+			break;
+		case DMA_TO_DEVICE:
+			memcpy_toio(map.virt_addr, buf, map.pci_size);
+			break;
+		default:
+			ret = -EINVAL;
+			goto unlock;
+		}
+
+		pci_addr += map.pci_size;
+		buf += map.pci_size;
+		length -= map.pci_size;
+
+		nvmet_pci_epf_mem_unmap(nvme_epf, &map);
+	}
+
+unlock:
+	mutex_unlock(&nvme_epf->mmio_lock);
+
+	return ret;
+}
+
+static inline int nvmet_pci_epf_transfer_seg(struct nvmet_pci_epf *nvme_epf,
+		struct nvmet_pci_epf_segment *seg, enum dma_data_direction dir)
+{
+	if (nvme_epf->dma_enabled)
+		return nvmet_pci_epf_dma_transfer(nvme_epf, seg, dir);
+
+	return nvmet_pci_epf_mmio_transfer(nvme_epf, seg, dir);
+}
+
+static inline int nvmet_pci_epf_transfer(struct nvmet_pci_epf_ctrl *ctrl,
+					 void *buf, u64 pci_addr, u32 length,
+					 enum dma_data_direction dir)
+{
+	struct nvmet_pci_epf_segment seg = {
+		.buf = buf,
+		.pci_addr = pci_addr,
+		.length = length,
+	};
+
+	return nvmet_pci_epf_transfer_seg(ctrl->nvme_epf, &seg, dir);
+}
+
+static int nvmet_pci_epf_alloc_irq_vectors(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	ctrl->irq_vectors = kcalloc(ctrl->nr_queues,
+				    sizeof(struct nvmet_pci_epf_irq_vector),
+				    GFP_KERNEL);
+	if (!ctrl->irq_vectors)
+		return -ENOMEM;
+
+	mutex_init(&ctrl->irq_lock);
+
+	return 0;
+}
+
+static void nvmet_pci_epf_free_irq_vectors(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	if (ctrl->irq_vectors) {
+		mutex_destroy(&ctrl->irq_lock);
+		kfree(ctrl->irq_vectors);
+		ctrl->irq_vectors = NULL;
+	}
+}
+
+static struct nvmet_pci_epf_irq_vector *
+nvmet_pci_epf_find_irq_vector(struct nvmet_pci_epf_ctrl *ctrl, u16 vector)
+{
+	struct nvmet_pci_epf_irq_vector *iv;
+	int i;
+
+	lockdep_assert_held(&ctrl->irq_lock);
+
+	for (i = 0; i < ctrl->nr_queues; i++) {
+		iv = &ctrl->irq_vectors[i];
+		if (iv->ref && iv->vector == vector)
+			return iv;
+	}
+
+	return NULL;
+}
+
+static struct nvmet_pci_epf_irq_vector *
+nvmet_pci_epf_add_irq_vector(struct nvmet_pci_epf_ctrl *ctrl, u16 vector)
+{
+	struct nvmet_pci_epf_irq_vector *iv;
+	int i;
+
+	mutex_lock(&ctrl->irq_lock);
+
+	iv = nvmet_pci_epf_find_irq_vector(ctrl, vector);
+	if (iv) {
+		iv->ref++;
+		goto unlock;
+	}
+
+	for (i = 0; i < ctrl->nr_queues; i++) {
+		iv = &ctrl->irq_vectors[i];
+		if (!iv->ref)
+			break;
+	}
+
+	if (WARN_ON_ONCE(!iv))
+		goto unlock;
+
+	iv->ref = 1;
+	iv->vector = vector;
+	iv->nr_irqs = 0;
+
+unlock:
+	mutex_unlock(&ctrl->irq_lock);
+
+	return iv;
+}
+
+static void nvmet_pci_epf_remove_irq_vector(struct nvmet_pci_epf_ctrl *ctrl,
+					    u16 vector)
+{
+	struct nvmet_pci_epf_irq_vector *iv;
+
+	mutex_lock(&ctrl->irq_lock);
+
+	iv = nvmet_pci_epf_find_irq_vector(ctrl, vector);
+	if (iv) {
+		iv->ref--;
+		if (!iv->ref) {
+			iv->vector = 0;
+			iv->nr_irqs = 0;
+		}
+	}
+
+	mutex_unlock(&ctrl->irq_lock);
+}
+
+static bool nvmet_pci_epf_should_raise_irq(struct nvmet_pci_epf_ctrl *ctrl,
+		struct nvmet_pci_epf_queue *cq, bool force)
+{
+	struct nvmet_pci_epf_irq_vector *iv = cq->iv;
+	bool ret;
+
+	if (!test_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags))
+		return false;
+
+	/* IRQ coalescing for the admin queue is not allowed. */
+	if (!cq->qid)
+		return true;
+
+	if (iv->cd)
+		return true;
+
+	if (force) {
+		ret = iv->nr_irqs > 0;
+	} else {
+		iv->nr_irqs++;
+		ret = iv->nr_irqs >= ctrl->irq_vector_threshold;
+	}
+	if (ret)
+		iv->nr_irqs = 0;
+
+	return ret;
+}
+
+static void nvmet_pci_epf_raise_irq(struct nvmet_pci_epf_ctrl *ctrl,
+		struct nvmet_pci_epf_queue *cq, bool force)
+{
+	struct nvmet_pci_epf *nvme_epf = ctrl->nvme_epf;
+	struct pci_epf *epf = nvme_epf->epf;
+	int ret = 0;
+
+	if (!test_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags))
+		return;
+
+	mutex_lock(&ctrl->irq_lock);
+
+	if (!nvmet_pci_epf_should_raise_irq(ctrl, cq, force))
+		goto unlock;
+
+	switch (nvme_epf->irq_type) {
+	case PCI_IRQ_MSIX:
+	case PCI_IRQ_MSI:
+		ret = pci_epc_raise_irq(epf->epc, epf->func_no, epf->vfunc_no,
+					nvme_epf->irq_type, cq->vector + 1);
+		if (!ret)
+			break;
+		/*
+		 * If we got an error, it is likely because the host is using
+		 * legacy IRQs (e.g. BIOS, grub).
+		 */
+		fallthrough;
+	case PCI_IRQ_INTX:
+		ret = pci_epc_raise_irq(epf->epc, epf->func_no, epf->vfunc_no,
+					PCI_IRQ_INTX, 0);
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		ret = -EINVAL;
+		break;
+	}
+
+	if (ret)
+		dev_err(ctrl->dev, "Failed to raise IRQ (err=%d)\n", ret);
+
+unlock:
+	mutex_unlock(&ctrl->irq_lock);
+}
+
+static inline const char *nvmet_pci_epf_iod_name(struct nvmet_pci_epf_iod *iod)
+{
+	return nvme_opcode_str(iod->sq->qid, iod->cmd.common.opcode);
+}
+
+static void nvmet_pci_epf_exec_iod_work(struct work_struct *work);
+
+static struct nvmet_pci_epf_iod *
+nvmet_pci_epf_alloc_iod(struct nvmet_pci_epf_queue *sq)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = sq->ctrl;
+	struct nvmet_pci_epf_iod *iod;
+
+	iod = mempool_alloc(&ctrl->iod_pool, GFP_KERNEL);
+	if (unlikely(!iod))
+		return NULL;
+
+	memset(iod, 0, sizeof(*iod));
+	iod->req.cmd = &iod->cmd;
+	iod->req.cqe = &iod->cqe;
+	iod->req.port = ctrl->port;
+	iod->ctrl = ctrl;
+	iod->sq = sq;
+	iod->cq = &ctrl->cq[sq->qid];
+	INIT_LIST_HEAD(&iod->link);
+	iod->dma_dir = DMA_NONE;
+	INIT_WORK(&iod->work, nvmet_pci_epf_exec_iod_work);
+	init_completion(&iod->done);
+
+	return iod;
+}
+
+/*
+ * Allocate or grow a command table of PCI segments.
+ */
+static int nvmet_pci_epf_alloc_iod_data_segs(struct nvmet_pci_epf_iod *iod,
+					     int nsegs)
+{
+	struct nvmet_pci_epf_segment *segs;
+	int nr_segs = iod->nr_data_segs + nsegs;
+
+	segs = krealloc(iod->data_segs,
+			nr_segs * sizeof(struct nvmet_pci_epf_segment),
+			GFP_KERNEL | __GFP_ZERO);
+	if (!segs)
+		return -ENOMEM;
+
+	iod->nr_data_segs = nr_segs;
+	iod->data_segs = segs;
+
+	return 0;
+}
+
+static void nvmet_pci_epf_free_iod(struct nvmet_pci_epf_iod *iod)
+{
+	int i;
+
+	if (iod->data_segs) {
+		for (i = 0; i < iod->nr_data_segs; i++)
+			kfree(iod->data_segs[i].buf);
+		if (iod->data_segs != &iod->data_seg)
+			kfree(iod->data_segs);
+	}
+	if (iod->data_sgt.nents > 1)
+		sg_free_table(&iod->data_sgt);
+	mempool_free(iod, &iod->ctrl->iod_pool);
+}
+
+static int nvmet_pci_epf_transfer_iod_data(struct nvmet_pci_epf_iod *iod)
+{
+	struct nvmet_pci_epf *nvme_epf = iod->ctrl->nvme_epf;
+	struct nvmet_pci_epf_segment *seg = &iod->data_segs[0];
+	int i, ret;
+
+	/* Split the data transfer according to the PCI segments. */
+	for (i = 0; i < iod->nr_data_segs; i++, seg++) {
+		ret = nvmet_pci_epf_transfer_seg(nvme_epf, seg, iod->dma_dir);
+		if (ret) {
+			iod->status = NVME_SC_DATA_XFER_ERROR | NVME_STATUS_DNR;
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static inline u32 nvmet_pci_epf_prp_ofst(struct nvmet_pci_epf_ctrl *ctrl,
+					 u64 prp)
+{
+	return prp & ctrl->mps_mask;
+}
+
+static inline size_t nvmet_pci_epf_prp_size(struct nvmet_pci_epf_ctrl *ctrl,
+					    u64 prp)
+{
+	return ctrl->mps - nvmet_pci_epf_prp_ofst(ctrl, prp);
+}
+
+/*
+ * Transfer a PRP list from the host and return the number of prps.
+ */
+static int nvmet_pci_epf_get_prp_list(struct nvmet_pci_epf_ctrl *ctrl, u64 prp,
+				      size_t xfer_len, __le64 *prps)
+{
+	size_t nr_prps = (xfer_len + ctrl->mps_mask) >> ctrl->mps_shift;
+	u32 length;
+	int ret;
+
+	/*
+	 * Compute the number of PRPs required for the number of bytes to
+	 * transfer (xfer_len). If this number overflows the memory page size
+	 * with the PRP list pointer specified, only return the space available
+	 * in the memory page, the last PRP in there will be a PRP list pointer
+	 * to the remaining PRPs.
+	 */
+	length = min(nvmet_pci_epf_prp_size(ctrl, prp), nr_prps << 3);
+	ret = nvmet_pci_epf_transfer(ctrl, prps, prp, length, DMA_FROM_DEVICE);
+	if (ret)
+		return ret;
+
+	return length >> 3;
+}
+
+static int nvmet_pci_epf_iod_parse_prp_list(struct nvmet_pci_epf_ctrl *ctrl,
+					    struct nvmet_pci_epf_iod *iod)
+{
+	struct nvme_command *cmd = &iod->cmd;
+	struct nvmet_pci_epf_segment *seg;
+	size_t size = 0, ofst, prp_size, xfer_len;
+	size_t transfer_len = iod->data_len;
+	int nr_segs, nr_prps = 0;
+	u64 pci_addr, prp;
+	int i = 0, ret;
+	__le64 *prps;
+
+	prps = kzalloc(ctrl->mps, GFP_KERNEL);
+	if (!prps)
+		goto err_internal;
+
+	/*
+	 * Allocate PCI segments for the command: this considers the worst case
+	 * scenario where all prps are discontiguous, so get as many segments
+	 * as we can have prps. In practice, most of the time, we will have
+	 * far less PCI segments than prps.
+	 */
+	prp = le64_to_cpu(cmd->common.dptr.prp1);
+	if (!prp)
+		goto err_invalid_field;
+
+	ofst = nvmet_pci_epf_prp_ofst(ctrl, prp);
+	nr_segs = (transfer_len + ofst + ctrl->mps - 1) >> ctrl->mps_shift;
+
+	ret = nvmet_pci_epf_alloc_iod_data_segs(iod, nr_segs);
+	if (ret)
+		goto err_internal;
+
+	/* Set the first segment using prp1. */
+	seg = &iod->data_segs[0];
+	seg->pci_addr = prp;
+	seg->length = nvmet_pci_epf_prp_size(ctrl, prp);
+
+	size = seg->length;
+	pci_addr = prp + size;
+	nr_segs = 1;
+
+	/*
+	 * Now build the PCI address segments using the PRP lists, starting
+	 * from prp2.
+	 */
+	prp = le64_to_cpu(cmd->common.dptr.prp2);
+	if (!prp)
+		goto err_invalid_field;
+
+	while (size < transfer_len) {
+		xfer_len = transfer_len - size;
+
+		if (!nr_prps) {
+			nr_prps = nvmet_pci_epf_get_prp_list(ctrl, prp,
+							     xfer_len, prps);
+			if (nr_prps < 0)
+				goto err_internal;
+
+			i = 0;
+			ofst = 0;
+		}
+
+		/* Current entry */
+		prp = le64_to_cpu(prps[i]);
+		if (!prp)
+			goto err_invalid_field;
+
+		/* Did we reach the last PRP entry of the list? */
+		if (xfer_len > ctrl->mps && i == nr_prps - 1) {
+			/* We need more PRPs: PRP is a list pointer. */
+			nr_prps = 0;
+			continue;
+		}
+
+		/* Only the first PRP is allowed to have an offset. */
+		if (nvmet_pci_epf_prp_ofst(ctrl, prp))
+			goto err_invalid_offset;
+
+		if (prp != pci_addr) {
+			/* Discontiguous prp: new segment. */
+			nr_segs++;
+			if (WARN_ON_ONCE(nr_segs > iod->nr_data_segs))
+				goto err_internal;
+
+			seg++;
+			seg->pci_addr = prp;
+			seg->length = 0;
+			pci_addr = prp;
+		}
+
+		prp_size = min_t(size_t, ctrl->mps, xfer_len);
+		seg->length += prp_size;
+		pci_addr += prp_size;
+		size += prp_size;
+
+		i++;
+	}
+
+	iod->nr_data_segs = nr_segs;
+	ret = 0;
+
+	if (size != transfer_len) {
+		dev_err(ctrl->dev,
+			"PRPs transfer length mismatch: got %zu B, need %zu B\n",
+			size, transfer_len);
+		goto err_internal;
+	}
+
+	kfree(prps);
+
+	return 0;
+
+err_invalid_offset:
+	dev_err(ctrl->dev, "PRPs list invalid offset\n");
+	iod->status = NVME_SC_PRP_INVALID_OFFSET | NVME_STATUS_DNR;
+	goto err;
+
+err_invalid_field:
+	dev_err(ctrl->dev, "PRPs list invalid field\n");
+	iod->status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
+	goto err;
+
+err_internal:
+	dev_err(ctrl->dev, "PRPs list internal error\n");
+	iod->status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
+
+err:
+	kfree(prps);
+	return -EINVAL;
+}
+
+static int nvmet_pci_epf_iod_parse_prp_simple(struct nvmet_pci_epf_ctrl *ctrl,
+					      struct nvmet_pci_epf_iod *iod)
+{
+	struct nvme_command *cmd = &iod->cmd;
+	size_t transfer_len = iod->data_len;
+	int ret, nr_segs = 1;
+	u64 prp1, prp2 = 0;
+	size_t prp1_size;
+
+	prp1 = le64_to_cpu(cmd->common.dptr.prp1);
+	prp1_size = nvmet_pci_epf_prp_size(ctrl, prp1);
+
+	/* For commands crossing a page boundary, we should have prp2. */
+	if (transfer_len > prp1_size) {
+		prp2 = le64_to_cpu(cmd->common.dptr.prp2);
+		if (!prp2) {
+			iod->status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
+			return -EINVAL;
+		}
+		if (nvmet_pci_epf_prp_ofst(ctrl, prp2)) {
+			iod->status =
+				NVME_SC_PRP_INVALID_OFFSET | NVME_STATUS_DNR;
+			return -EINVAL;
+		}
+		if (prp2 != prp1 + prp1_size)
+			nr_segs = 2;
+	}
+
+	if (nr_segs == 1) {
+		iod->nr_data_segs = 1;
+		iod->data_segs = &iod->data_seg;
+		iod->data_segs[0].pci_addr = prp1;
+		iod->data_segs[0].length = transfer_len;
+		return 0;
+	}
+
+	ret = nvmet_pci_epf_alloc_iod_data_segs(iod, nr_segs);
+	if (ret) {
+		iod->status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
+		return ret;
+	}
+
+	iod->data_segs[0].pci_addr = prp1;
+	iod->data_segs[0].length = prp1_size;
+	iod->data_segs[1].pci_addr = prp2;
+	iod->data_segs[1].length = transfer_len - prp1_size;
+
+	return 0;
+}
+
+static int nvmet_pci_epf_iod_parse_prps(struct nvmet_pci_epf_iod *iod)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = iod->ctrl;
+	u64 prp1 = le64_to_cpu(iod->cmd.common.dptr.prp1);
+	size_t ofst;
+
+	/* Get the PCI address segments for the command using its PRPs. */
+	ofst = nvmet_pci_epf_prp_ofst(ctrl, prp1);
+	if (ofst & 0x3) {
+		iod->status = NVME_SC_PRP_INVALID_OFFSET | NVME_STATUS_DNR;
+		return -EINVAL;
+	}
+
+	if (iod->data_len + ofst <= ctrl->mps * 2)
+		return nvmet_pci_epf_iod_parse_prp_simple(ctrl, iod);
+
+	return nvmet_pci_epf_iod_parse_prp_list(ctrl, iod);
+}
+
+/*
+ * Transfer an SGL segment from the host and return the number of data
+ * descriptors and the next segment descriptor, if any.
+ */
+static struct nvme_sgl_desc *
+nvmet_pci_epf_get_sgl_segment(struct nvmet_pci_epf_ctrl *ctrl,
+			      struct nvme_sgl_desc *desc, unsigned int *nr_sgls)
+{
+	struct nvme_sgl_desc *sgls;
+	u32 length = le32_to_cpu(desc->length);
+	int nr_descs, ret;
+	void *buf;
+
+	buf = kmalloc(length, GFP_KERNEL);
+	if (!buf)
+		return NULL;
+
+	ret = nvmet_pci_epf_transfer(ctrl, buf, le64_to_cpu(desc->addr), length,
+				     DMA_FROM_DEVICE);
+	if (ret) {
+		kfree(buf);
+		return NULL;
+	}
+
+	sgls = buf;
+	nr_descs = length / sizeof(struct nvme_sgl_desc);
+	if (sgls[nr_descs - 1].type == (NVME_SGL_FMT_SEG_DESC << 4) ||
+	    sgls[nr_descs - 1].type == (NVME_SGL_FMT_LAST_SEG_DESC << 4)) {
+		/*
+		 * We have another SGL segment following this one: do not count
+		 * it as a regular data SGL descriptor and return it to the
+		 * caller.
+		 */
+		*desc = sgls[nr_descs - 1];
+		nr_descs--;
+	} else {
+		/* We do not have another SGL segment after this one. */
+		desc->length = 0;
+	}
+
+	*nr_sgls = nr_descs;
+
+	return sgls;
+}
+
+static int nvmet_pci_epf_iod_parse_sgl_segments(struct nvmet_pci_epf_ctrl *ctrl,
+						struct nvmet_pci_epf_iod *iod)
+{
+	struct nvme_command *cmd = &iod->cmd;
+	struct nvme_sgl_desc seg = cmd->common.dptr.sgl;
+	struct nvme_sgl_desc *sgls = NULL;
+	int n = 0, i, nr_sgls;
+	int ret;
+
+	/*
+	 * We do not support inline data nor keyed SGLs, so we should be seeing
+	 * only segment descriptors.
+	 */
+	if (seg.type != (NVME_SGL_FMT_SEG_DESC << 4) &&
+	    seg.type != (NVME_SGL_FMT_LAST_SEG_DESC << 4)) {
+		iod->status = NVME_SC_SGL_INVALID_TYPE | NVME_STATUS_DNR;
+		return -EIO;
+	}
+
+	while (seg.length) {
+		sgls = nvmet_pci_epf_get_sgl_segment(ctrl, &seg, &nr_sgls);
+		if (!sgls) {
+			iod->status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
+			return -EIO;
+		}
+
+		/* Grow the PCI segment table as needed. */
+		ret = nvmet_pci_epf_alloc_iod_data_segs(iod, nr_sgls);
+		if (ret) {
+			iod->status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
+			goto out;
+		}
+
+		/*
+		 * Parse the SGL descriptors to build the PCI segment table,
+		 * checking the descriptor type as we go.
+		 */
+		for (i = 0; i < nr_sgls; i++) {
+			if (sgls[i].type != (NVME_SGL_FMT_DATA_DESC << 4)) {
+				iod->status = NVME_SC_SGL_INVALID_TYPE |
+					NVME_STATUS_DNR;
+				goto out;
+			}
+			iod->data_segs[n].pci_addr = le64_to_cpu(sgls[i].addr);
+			iod->data_segs[n].length = le32_to_cpu(sgls[i].length);
+			n++;
+		}
+
+		kfree(sgls);
+	}
+
+ out:
+	if (iod->status != NVME_SC_SUCCESS) {
+		kfree(sgls);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int nvmet_pci_epf_iod_parse_sgls(struct nvmet_pci_epf_iod *iod)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = iod->ctrl;
+	struct nvme_sgl_desc *sgl = &iod->cmd.common.dptr.sgl;
+
+	if (sgl->type == (NVME_SGL_FMT_DATA_DESC << 4)) {
+		/* Single data descriptor case. */
+		iod->nr_data_segs = 1;
+		iod->data_segs = &iod->data_seg;
+		iod->data_seg.pci_addr = le64_to_cpu(sgl->addr);
+		iod->data_seg.length = le32_to_cpu(sgl->length);
+		return 0;
+	}
+
+	return nvmet_pci_epf_iod_parse_sgl_segments(ctrl, iod);
+}
+
+static int nvmet_pci_epf_alloc_iod_data_buf(struct nvmet_pci_epf_iod *iod)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = iod->ctrl;
+	struct nvmet_req *req = &iod->req;
+	struct nvmet_pci_epf_segment *seg;
+	struct scatterlist *sg;
+	int ret, i;
+
+	if (iod->data_len > ctrl->mdts) {
+		iod->status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
+		return -EINVAL;
+	}
+
+	/*
+	 * Get the PCI address segments for the command data buffer using either
+	 * its SGLs or PRPs.
+	 */
+	if (iod->cmd.common.flags & NVME_CMD_SGL_ALL)
+		ret = nvmet_pci_epf_iod_parse_sgls(iod);
+	else
+		ret = nvmet_pci_epf_iod_parse_prps(iod);
+	if (ret)
+		return ret;
+
+	/* Get a command buffer using SGLs matching the PCI segments. */
+	if (iod->nr_data_segs == 1) {
+		sg_init_table(&iod->data_sgl, 1);
+		iod->data_sgt.sgl = &iod->data_sgl;
+		iod->data_sgt.nents = 1;
+		iod->data_sgt.orig_nents = 1;
+	} else {
+		ret = sg_alloc_table(&iod->data_sgt, iod->nr_data_segs,
+				     GFP_KERNEL);
+		if (ret)
+			goto err_nomem;
+	}
+
+	for_each_sgtable_sg(&iod->data_sgt, sg, i) {
+		seg = &iod->data_segs[i];
+		seg->buf = kmalloc(seg->length, GFP_KERNEL);
+		if (!seg->buf)
+			goto err_nomem;
+		sg_set_buf(sg, seg->buf, seg->length);
+	}
+
+	req->transfer_len = iod->data_len;
+	req->sg = iod->data_sgt.sgl;
+	req->sg_cnt = iod->data_sgt.nents;
+
+	return 0;
+
+err_nomem:
+	iod->status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
+	return -ENOMEM;
+}
+
+static void nvmet_pci_epf_complete_iod(struct nvmet_pci_epf_iod *iod)
+{
+	struct nvmet_pci_epf_queue *cq = iod->cq;
+	unsigned long flags;
+
+	/* Print an error message for failed commands, except AENs. */
+	iod->status = le16_to_cpu(iod->cqe.status) >> 1;
+	if (iod->status && iod->cmd.common.opcode != nvme_admin_async_event)
+		dev_err(iod->ctrl->dev,
+			"CQ[%d]: Command %s (0x%x) status 0x%0x\n",
+			iod->sq->qid, nvmet_pci_epf_iod_name(iod),
+			iod->cmd.common.opcode, iod->status);
+
+	/*
+	 * Add the command to the list of completed commands and schedule the
+	 * CQ work.
+	 */
+	spin_lock_irqsave(&cq->lock, flags);
+	list_add_tail(&iod->link, &cq->list);
+	queue_delayed_work(system_highpri_wq, &cq->work, 0);
+	spin_unlock_irqrestore(&cq->lock, flags);
+}
+
+static void nvmet_pci_epf_drain_queue(struct nvmet_pci_epf_queue *queue)
+{
+	struct nvmet_pci_epf_iod *iod;
+	unsigned long flags;
+
+	spin_lock_irqsave(&queue->lock, flags);
+	while (!list_empty(&queue->list)) {
+		iod = list_first_entry(&queue->list, struct nvmet_pci_epf_iod,
+				       link);
+		list_del_init(&iod->link);
+		nvmet_pci_epf_free_iod(iod);
+	}
+	spin_unlock_irqrestore(&queue->lock, flags);
+}
+
+static int nvmet_pci_epf_add_port(struct nvmet_port *port)
+{
+	mutex_lock(&nvmet_pci_epf_ports_mutex);
+	list_add_tail(&port->entry, &nvmet_pci_epf_ports);
+	mutex_unlock(&nvmet_pci_epf_ports_mutex);
+	return 0;
+}
+
+static void nvmet_pci_epf_remove_port(struct nvmet_port *port)
+{
+	mutex_lock(&nvmet_pci_epf_ports_mutex);
+	list_del_init(&port->entry);
+	mutex_unlock(&nvmet_pci_epf_ports_mutex);
+}
+
+static struct nvmet_port *
+nvmet_pci_epf_find_port(struct nvmet_pci_epf_ctrl *ctrl, __le16 portid)
+{
+	struct nvmet_port *p, *port = NULL;
+
+	mutex_lock(&nvmet_pci_epf_ports_mutex);
+	list_for_each_entry(p, &nvmet_pci_epf_ports, entry) {
+		if (p->disc_addr.portid == portid) {
+			port = p;
+			break;
+		}
+	}
+	mutex_unlock(&nvmet_pci_epf_ports_mutex);
+
+	return port;
+}
+
+static void nvmet_pci_epf_queue_response(struct nvmet_req *req)
+{
+	struct nvmet_pci_epf_iod *iod =
+		container_of(req, struct nvmet_pci_epf_iod, req);
+
+	iod->status = le16_to_cpu(req->cqe->status) >> 1;
+
+	/* If we have no data to transfer, directly complete the command. */
+	if (!iod->data_len || iod->dma_dir != DMA_TO_DEVICE) {
+		nvmet_pci_epf_complete_iod(iod);
+		return;
+	}
+
+	complete(&iod->done);
+}
+
+static u8 nvmet_pci_epf_get_mdts(const struct nvmet_ctrl *tctrl)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = tctrl->drvdata;
+	int page_shift = NVME_CAP_MPSMIN(tctrl->cap) + 12;
+
+	return ilog2(ctrl->mdts) - page_shift;
+}
+
+static u16 nvmet_pci_epf_create_cq(struct nvmet_ctrl *tctrl,
+		u16 cqid, u16 flags, u16 qsize, u64 pci_addr, u16 vector)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = tctrl->drvdata;
+	struct nvmet_pci_epf_queue *cq = &ctrl->cq[cqid];
+	u16 status;
+
+	if (test_and_set_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags))
+		return NVME_SC_QID_INVALID | NVME_STATUS_DNR;
+
+	if (!(flags & NVME_QUEUE_PHYS_CONTIG))
+		return NVME_SC_INVALID_QUEUE | NVME_STATUS_DNR;
+
+	if (flags & NVME_CQ_IRQ_ENABLED)
+		set_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags);
+
+	cq->pci_addr = pci_addr;
+	cq->qid = cqid;
+	cq->depth = qsize + 1;
+	cq->vector = vector;
+	cq->head = 0;
+	cq->tail = 0;
+	cq->phase = 1;
+	cq->db = NVME_REG_DBS + (((cqid * 2) + 1) * sizeof(u32));
+	nvmet_pci_epf_bar_write32(ctrl, cq->db, 0);
+
+	if (!cqid)
+		cq->qes = sizeof(struct nvme_completion);
+	else
+		cq->qes = ctrl->io_cqes;
+	cq->pci_size = cq->qes * cq->depth;
+
+	cq->iv = nvmet_pci_epf_add_irq_vector(ctrl, vector);
+	if (!cq->iv) {
+		status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
+		goto err;
+	}
+
+	status = nvmet_cq_create(tctrl, &cq->nvme_cq, cqid, cq->depth);
+	if (status != NVME_SC_SUCCESS)
+		goto err;
+
+	dev_dbg(ctrl->dev, "CQ[%u]: %u entries of %zu B, IRQ vector %u\n",
+		cqid, qsize, cq->qes, cq->vector);
+
+	return NVME_SC_SUCCESS;
+
+err:
+	clear_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags);
+	clear_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags);
+	return status;
+}
+
+static u16 nvmet_pci_epf_delete_cq(struct nvmet_ctrl *tctrl, u16 cqid)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = tctrl->drvdata;
+	struct nvmet_pci_epf_queue *cq = &ctrl->cq[cqid];
+
+	if (!test_and_clear_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags))
+		return NVME_SC_QID_INVALID | NVME_STATUS_DNR;
+
+	cancel_delayed_work_sync(&cq->work);
+	nvmet_pci_epf_drain_queue(cq);
+	nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);
+
+	return NVME_SC_SUCCESS;
+}
+
+static u16 nvmet_pci_epf_create_sq(struct nvmet_ctrl *tctrl,
+		u16 sqid, u16 flags, u16 qsize, u64 pci_addr)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = tctrl->drvdata;
+	struct nvmet_pci_epf_queue *sq = &ctrl->sq[sqid];
+	u16 status;
+
+	if (test_and_set_bit(NVMET_PCI_EPF_Q_LIVE, &sq->flags))
+		return NVME_SC_QID_INVALID | NVME_STATUS_DNR;
+
+	if (!(flags & NVME_QUEUE_PHYS_CONTIG))
+		return NVME_SC_INVALID_QUEUE | NVME_STATUS_DNR;
+
+	sq->pci_addr = pci_addr;
+	sq->qid = sqid;
+	sq->depth = qsize + 1;
+	sq->head = 0;
+	sq->tail = 0;
+	sq->phase = 0;
+	sq->db = NVME_REG_DBS + (sqid * 2 * sizeof(u32));
+	nvmet_pci_epf_bar_write32(ctrl, sq->db, 0);
+	if (!sqid)
+		sq->qes = 1UL << NVME_ADM_SQES;
+	else
+		sq->qes = ctrl->io_sqes;
+	sq->pci_size = sq->qes * sq->depth;
+
+	status = nvmet_sq_create(tctrl, &sq->nvme_sq, sqid, sq->depth);
+	if (status != NVME_SC_SUCCESS)
+		goto out_clear_bit;
+
+	sq->iod_wq = alloc_workqueue("sq%d_wq", WQ_UNBOUND,
+				min_t(int, sq->depth, WQ_MAX_ACTIVE), sqid);
+	if (!sq->iod_wq) {
+		dev_err(ctrl->dev, "Failed to create SQ %d work queue\n", sqid);
+		status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
+		goto out_destroy_sq;
+	}
+
+	dev_dbg(ctrl->dev, "SQ[%u]: %u entries of %zu B\n",
+		sqid, qsize, sq->qes);
+
+	return NVME_SC_SUCCESS;
+
+out_destroy_sq:
+	nvmet_sq_destroy(&sq->nvme_sq);
+out_clear_bit:
+	clear_bit(NVMET_PCI_EPF_Q_LIVE, &sq->flags);
+	return status;
+}
+
+static u16 nvmet_pci_epf_delete_sq(struct nvmet_ctrl *tctrl, u16 sqid)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = tctrl->drvdata;
+	struct nvmet_pci_epf_queue *sq = &ctrl->sq[sqid];
+
+	if (!test_and_clear_bit(NVMET_PCI_EPF_Q_LIVE, &sq->flags))
+		return NVME_SC_QID_INVALID | NVME_STATUS_DNR;
+
+	flush_workqueue(sq->iod_wq);
+	destroy_workqueue(sq->iod_wq);
+	sq->iod_wq = NULL;
+
+	nvmet_pci_epf_drain_queue(sq);
+
+	if (sq->nvme_sq.ctrl)
+		nvmet_sq_destroy(&sq->nvme_sq);
+
+	return NVME_SC_SUCCESS;
+}
+
+static u16 nvmet_pci_epf_get_feat(const struct nvmet_ctrl *tctrl,
+				  u8 feat, void *data)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = tctrl->drvdata;
+	struct nvmet_feat_arbitration *arb;
+	struct nvmet_feat_irq_coalesce *irqc;
+	struct nvmet_feat_irq_config *irqcfg;
+	struct nvmet_pci_epf_irq_vector *iv;
+	u16 status;
+
+	switch (feat) {
+	case NVME_FEAT_ARBITRATION:
+		arb = data;
+		if (!ctrl->sq_ab)
+			arb->ab = 0x7;
+		else
+			arb->ab = ilog2(ctrl->sq_ab);
+		return NVME_SC_SUCCESS;
+
+	case NVME_FEAT_IRQ_COALESCE:
+		irqc = data;
+		irqc->thr = ctrl->irq_vector_threshold;
+		irqc->time = 0;
+		return NVME_SC_SUCCESS;
+
+	case NVME_FEAT_IRQ_CONFIG:
+		irqcfg = data;
+		mutex_lock(&ctrl->irq_lock);
+		iv = nvmet_pci_epf_find_irq_vector(ctrl, irqcfg->iv);
+		if (iv) {
+			irqcfg->cd = iv->cd;
+			status = NVME_SC_SUCCESS;
+		} else {
+			status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
+		}
+		mutex_unlock(&ctrl->irq_lock);
+		return status;
+
+	default:
+		return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
+	}
+}
+
+static u16 nvmet_pci_epf_set_feat(const struct nvmet_ctrl *tctrl,
+				  u8 feat, void *data)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = tctrl->drvdata;
+	struct nvmet_feat_arbitration *arb;
+	struct nvmet_feat_irq_coalesce *irqc;
+	struct nvmet_feat_irq_config *irqcfg;
+	struct nvmet_pci_epf_irq_vector *iv;
+	u16 status;
+
+	switch (feat) {
+	case NVME_FEAT_ARBITRATION:
+		arb = data;
+		if (arb->ab == 0x7)
+			ctrl->sq_ab = 0;
+		else
+			ctrl->sq_ab = 1 << arb->ab;
+		return NVME_SC_SUCCESS;
+
+	case NVME_FEAT_IRQ_COALESCE:
+		/*
+		 * Since we do not implement precise IRQ coalescing timing,
+		 * ignore the time field.
+		 */
+		irqc = data;
+		ctrl->irq_vector_threshold = irqc->thr + 1;
+		return NVME_SC_SUCCESS;
+
+	case NVME_FEAT_IRQ_CONFIG:
+		irqcfg = data;
+		mutex_lock(&ctrl->irq_lock);
+		iv = nvmet_pci_epf_find_irq_vector(ctrl, irqcfg->iv);
+		if (iv) {
+			iv->cd = irqcfg->cd;
+			status = NVME_SC_SUCCESS;
+		} else {
+			status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
+		}
+		mutex_unlock(&ctrl->irq_lock);
+		return status;
+
+	default:
+		return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
+	}
+}
+
+static const struct nvmet_fabrics_ops nvmet_pci_epf_fabrics_ops = {
+	.owner		= THIS_MODULE,
+	.type		= NVMF_TRTYPE_PCI,
+	.add_port	= nvmet_pci_epf_add_port,
+	.remove_port	= nvmet_pci_epf_remove_port,
+	.queue_response = nvmet_pci_epf_queue_response,
+	.get_mdts	= nvmet_pci_epf_get_mdts,
+	.create_cq	= nvmet_pci_epf_create_cq,
+	.delete_cq	= nvmet_pci_epf_delete_cq,
+	.create_sq	= nvmet_pci_epf_create_sq,
+	.delete_sq	= nvmet_pci_epf_delete_sq,
+	.get_feature	= nvmet_pci_epf_get_feat,
+	.set_feature	= nvmet_pci_epf_set_feat,
+};
+
+static void nvmet_pci_epf_cq_work(struct work_struct *work);
+
+static void nvmet_pci_epf_init_queue(struct nvmet_pci_epf_ctrl *ctrl,
+				     unsigned int qid, bool sq)
+{
+	struct nvmet_pci_epf_queue *queue;
+
+	if (sq) {
+		queue = &ctrl->sq[qid];
+		set_bit(NVMET_PCI_EPF_Q_IS_SQ, &queue->flags);
+	} else {
+		queue = &ctrl->cq[qid];
+		INIT_DELAYED_WORK(&queue->work, nvmet_pci_epf_cq_work);
+	}
+	queue->ctrl = ctrl;
+	queue->qid = qid;
+	spin_lock_init(&queue->lock);
+	INIT_LIST_HEAD(&queue->list);
+}
+
+static int nvmet_pci_epf_alloc_queues(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	unsigned int qid;
+
+	ctrl->sq = kcalloc(ctrl->nr_queues,
+			   sizeof(struct nvmet_pci_epf_queue), GFP_KERNEL);
+	if (!ctrl->sq)
+		return -ENOMEM;
+
+	ctrl->cq = kcalloc(ctrl->nr_queues,
+			   sizeof(struct nvmet_pci_epf_queue), GFP_KERNEL);
+	if (!ctrl->cq) {
+		kfree(ctrl->sq);
+		ctrl->sq = NULL;
+		return -ENOMEM;
+	}
+
+	for (qid = 0; qid < ctrl->nr_queues; qid++) {
+		nvmet_pci_epf_init_queue(ctrl, qid, true);
+		nvmet_pci_epf_init_queue(ctrl, qid, false);
+	}
+
+	return 0;
+}
+
+static void nvmet_pci_epf_free_queues(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	kfree(ctrl->sq);
+	ctrl->sq = NULL;
+	kfree(ctrl->cq);
+	ctrl->cq = NULL;
+}
+
+static int nvmet_pci_epf_map_queue(struct nvmet_pci_epf_ctrl *ctrl,
+				   struct nvmet_pci_epf_queue *queue)
+{
+	struct nvmet_pci_epf *nvme_epf = ctrl->nvme_epf;
+	int ret;
+
+	ret = nvmet_pci_epf_mem_map(nvme_epf, queue->pci_addr,
+				      queue->pci_size, &queue->pci_map);
+	if (ret) {
+		dev_err(ctrl->dev, "Failed to map queue %u (err=%d)\n",
+			queue->qid, ret);
+		return ret;
+	}
+
+	if (queue->pci_map.pci_size < queue->pci_size) {
+		dev_err(ctrl->dev, "Invalid partial mapping of queue %u\n",
+			queue->qid);
+		nvmet_pci_epf_mem_unmap(nvme_epf, &queue->pci_map);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static inline void nvmet_pci_epf_unmap_queue(struct nvmet_pci_epf_ctrl *ctrl,
+					     struct nvmet_pci_epf_queue *queue)
+{
+	nvmet_pci_epf_mem_unmap(ctrl->nvme_epf, &queue->pci_map);
+}
+
+static void nvmet_pci_epf_exec_iod_work(struct work_struct *work)
+{
+	struct nvmet_pci_epf_iod *iod =
+		container_of(work, struct nvmet_pci_epf_iod, work);
+	struct nvmet_req *req = &iod->req;
+	int ret;
+
+	if (!iod->ctrl->link_up) {
+		nvmet_pci_epf_free_iod(iod);
+		return;
+	}
+
+	if (!test_bit(NVMET_PCI_EPF_Q_LIVE, &iod->sq->flags)) {
+		iod->status = NVME_SC_QID_INVALID | NVME_STATUS_DNR;
+		goto complete;
+	}
+
+	if (!nvmet_req_init(req, &iod->cq->nvme_cq, &iod->sq->nvme_sq,
+			    &nvmet_pci_epf_fabrics_ops))
+		goto complete;
+
+	iod->data_len = nvmet_req_transfer_len(req);
+	if (iod->data_len) {
+		/*
+		 * Get the data DMA transfer direction. Here "device" means the
+		 * PCI root-complex host.
+		 */
+		if (nvme_is_write(&iod->cmd))
+			iod->dma_dir = DMA_FROM_DEVICE;
+		else
+			iod->dma_dir = DMA_TO_DEVICE;
+
+		/*
+		 * Setup the command data buffer and get the command data from
+		 * the host if needed.
+		 */
+		ret = nvmet_pci_epf_alloc_iod_data_buf(iod);
+		if (!ret && iod->dma_dir == DMA_FROM_DEVICE)
+			ret = nvmet_pci_epf_transfer_iod_data(iod);
+		if (ret) {
+			nvmet_req_uninit(req);
+			goto complete;
+		}
+	}
+
+	req->execute(req);
+
+	/*
+	 * If we do not have data to transfer after the command execution
+	 * finishes, nvmet_pci_epf_queue_response() will complete the command
+	 * directly. No need to wait for the completion in this case.
+	 */
+	if (!iod->data_len || iod->dma_dir != DMA_TO_DEVICE)
+		return;
+
+	wait_for_completion(&iod->done);
+
+	if (iod->status == NVME_SC_SUCCESS) {
+		WARN_ON_ONCE(!iod->data_len || iod->dma_dir != DMA_TO_DEVICE);
+		nvmet_pci_epf_transfer_iod_data(iod);
+	}
+
+complete:
+	nvmet_pci_epf_complete_iod(iod);
+}
+
+static int nvmet_pci_epf_process_sq(struct nvmet_pci_epf_ctrl *ctrl,
+				    struct nvmet_pci_epf_queue *sq)
+{
+	struct nvmet_pci_epf_iod *iod;
+	int ret, n = 0;
+
+	sq->tail = nvmet_pci_epf_bar_read32(ctrl, sq->db);
+	while (sq->head != sq->tail && (!ctrl->sq_ab || n < ctrl->sq_ab)) {
+		iod = nvmet_pci_epf_alloc_iod(sq);
+		if (!iod)
+			break;
+
+		/* Get the NVMe command submitted by the host. */
+		ret = nvmet_pci_epf_transfer(ctrl, &iod->cmd,
+					     sq->pci_addr + sq->head * sq->qes,
+					     sq->qes, DMA_FROM_DEVICE);
+		if (ret) {
+			/* Not much we can do... */
+			nvmet_pci_epf_free_iod(iod);
+			break;
+		}
+
+		dev_dbg(ctrl->dev, "SQ[%u]: head %u, tail %u, command %s\n",
+			sq->qid, sq->head, sq->tail,
+			nvmet_pci_epf_iod_name(iod));
+
+		sq->head++;
+		if (sq->head == sq->depth)
+			sq->head = 0;
+		n++;
+
+		queue_work_on(WORK_CPU_UNBOUND, sq->iod_wq, &iod->work);
+
+		sq->tail = nvmet_pci_epf_bar_read32(ctrl, sq->db);
+	}
+
+	return n;
+}
+
+static void nvmet_pci_epf_poll_sqs_work(struct work_struct *work)
+{
+	struct nvmet_pci_epf_ctrl *ctrl =
+		container_of(work, struct nvmet_pci_epf_ctrl, poll_sqs.work);
+	struct nvmet_pci_epf_queue *sq;
+	unsigned long last = 0;
+	int i, nr_sqs;
+
+	while (ctrl->link_up && ctrl->enabled) {
+		nr_sqs = 0;
+		/* Do round-robin arbitration. */
+		for (i = 0; i < ctrl->nr_queues; i++) {
+			sq = &ctrl->sq[i];
+			if (!test_bit(NVMET_PCI_EPF_Q_LIVE, &sq->flags))
+				continue;
+			if (nvmet_pci_epf_process_sq(ctrl, sq))
+				nr_sqs++;
+		}
+
+		if (nr_sqs) {
+			last = jiffies;
+			continue;
+		}
+
+		/*
+		 * If we have not received any command on any queue for more
+		 * than NVMET_PCI_EPF_SQ_POLL_IDLE, assume we are idle and
+		 * reschedule. This avoids "burning" a CPU when the controller
+		 * is idle for a long time.
+		 */
+		if (time_is_before_jiffies(last + NVMET_PCI_EPF_SQ_POLL_IDLE))
+			break;
+
+		cpu_relax();
+	}
+
+	schedule_delayed_work(&ctrl->poll_sqs, NVMET_PCI_EPF_SQ_POLL_INTERVAL);
+}
+
+static void nvmet_pci_epf_cq_work(struct work_struct *work)
+{
+	struct nvmet_pci_epf_queue *cq =
+		container_of(work, struct nvmet_pci_epf_queue, work.work);
+	struct nvmet_pci_epf_ctrl *ctrl = cq->ctrl;
+	struct nvme_completion *cqe;
+	struct nvmet_pci_epf_iod *iod;
+	unsigned long flags;
+	int ret, n = 0;
+
+	ret = nvmet_pci_epf_map_queue(ctrl, cq);
+	if (ret)
+		goto again;
+
+	while (test_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags) && ctrl->link_up) {
+
+		/* Check that the CQ is not full. */
+		cq->head = nvmet_pci_epf_bar_read32(ctrl, cq->db);
+		if (cq->head == cq->tail + 1) {
+			ret = -EAGAIN;
+			break;
+		}
+
+		spin_lock_irqsave(&cq->lock, flags);
+		iod = list_first_entry_or_null(&cq->list,
+					       struct nvmet_pci_epf_iod, link);
+		if (iod)
+			list_del_init(&iod->link);
+		spin_unlock_irqrestore(&cq->lock, flags);
+
+		if (!iod)
+			break;
+
+		/* Post the IOD completion entry. */
+		cqe = &iod->cqe;
+		cqe->status = cpu_to_le16((iod->status << 1) | cq->phase);
+
+		dev_dbg(ctrl->dev,
+			"CQ[%u]: %s status 0x%x, result 0x%llx, head %u, tail %u, phase %u\n",
+			cq->qid, nvmet_pci_epf_iod_name(iod), iod->status,
+			le64_to_cpu(cqe->result.u64), cq->head, cq->tail,
+			cq->phase);
+
+		memcpy_toio(cq->pci_map.virt_addr + cq->tail * cq->qes,
+			    cqe, cq->qes);
+
+		cq->tail++;
+		if (cq->tail >= cq->depth) {
+			cq->tail = 0;
+			cq->phase ^= 1;
+		}
+
+		nvmet_pci_epf_free_iod(iod);
+
+		/* Signal the host. */
+		nvmet_pci_epf_raise_irq(ctrl, cq, false);
+		n++;
+	}
+
+	nvmet_pci_epf_unmap_queue(ctrl, cq);
+
+	/*
+	 * We do not support precise IRQ coalescing time (100ns units as per
+	 * NVMe specifications). So if we have posted completion entries without
+	 * reaching the interrupt coalescing threshold, raise an interrupt.
+	 */
+	if (n)
+		nvmet_pci_epf_raise_irq(ctrl, cq, true);
+
+again:
+	if (ret < 0)
+		queue_delayed_work(system_highpri_wq, &cq->work,
+				   NVMET_PCI_EPF_CQ_RETRY_INTERVAL);
+}
+
+static int nvmet_pci_epf_enable_ctrl(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	u64 pci_addr, asq, acq;
+	u32 aqa;
+	u16 status, qsize;
+
+	if (ctrl->enabled)
+		return 0;
+
+	dev_info(ctrl->dev, "Enabling controller\n");
+
+	ctrl->mps_shift = nvmet_cc_mps(ctrl->cc) + 12;
+	ctrl->mps = 1UL << ctrl->mps_shift;
+	ctrl->mps_mask = ctrl->mps - 1;
+
+	ctrl->io_sqes = 1UL << nvmet_cc_iosqes(ctrl->cc);
+	if (ctrl->io_sqes < sizeof(struct nvme_command)) {
+		dev_err(ctrl->dev, "Unsupported I/O SQES %zu (need %zu)\n",
+			ctrl->io_sqes, sizeof(struct nvme_command));
+		return -EINVAL;
+	}
+
+	ctrl->io_cqes = 1UL << nvmet_cc_iocqes(ctrl->cc);
+	if (ctrl->io_cqes < sizeof(struct nvme_completion)) {
+		dev_err(ctrl->dev, "Unsupported I/O CQES %zu (need %zu)\n",
+			ctrl->io_sqes, sizeof(struct nvme_completion));
+		return -EINVAL;
+	}
+
+	/* Create the admin queue. */
+	aqa = nvmet_pci_epf_bar_read32(ctrl, NVME_REG_AQA);
+	asq = nvmet_pci_epf_bar_read64(ctrl, NVME_REG_ASQ);
+	acq = nvmet_pci_epf_bar_read64(ctrl, NVME_REG_ACQ);
+
+	qsize = (aqa & 0x0fff0000) >> 16;
+	pci_addr = acq & GENMASK_ULL(63, 12);
+	status = nvmet_pci_epf_create_cq(ctrl->tctrl, 0,
+				NVME_CQ_IRQ_ENABLED | NVME_QUEUE_PHYS_CONTIG,
+				qsize, pci_addr, 0);
+	if (status != NVME_SC_SUCCESS) {
+		dev_err(ctrl->dev, "Failed to create admin completion queue\n");
+		return -EINVAL;
+	}
+
+	qsize = aqa & 0x00000fff;
+	pci_addr = asq & GENMASK_ULL(63, 12);
+	status = nvmet_pci_epf_create_sq(ctrl->tctrl, 0, NVME_QUEUE_PHYS_CONTIG,
+					 qsize, pci_addr);
+	if (status != NVME_SC_SUCCESS) {
+		dev_err(ctrl->dev, "Failed to create admin submission queue\n");
+		nvmet_pci_epf_delete_cq(ctrl->tctrl, 0);
+		return -EINVAL;
+	}
+
+	ctrl->sq_ab = NVMET_PCI_EPF_SQ_AB;
+	ctrl->irq_vector_threshold = NVMET_PCI_EPF_IV_THRESHOLD;
+	ctrl->enabled = true;
+
+	/* Start polling the controller SQs. */
+	schedule_delayed_work(&ctrl->poll_sqs, 0);
+
+	return 0;
+}
+
+static void nvmet_pci_epf_disable_ctrl(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	int qid;
+
+	if (!ctrl->enabled)
+		return;
+
+	dev_info(ctrl->dev, "Disabling controller\n");
+
+	ctrl->enabled = false;
+	cancel_delayed_work_sync(&ctrl->poll_sqs);
+
+	/* Delete all I/O queues first. */
+	for (qid = 1; qid < ctrl->nr_queues; qid++)
+		nvmet_pci_epf_delete_sq(ctrl->tctrl, qid);
+
+	for (qid = 1; qid < ctrl->nr_queues; qid++)
+		nvmet_pci_epf_delete_cq(ctrl->tctrl, qid);
+
+	/* Delete the admin queue last. */
+	nvmet_pci_epf_delete_sq(ctrl->tctrl, 0);
+	nvmet_pci_epf_delete_cq(ctrl->tctrl, 0);
+}
+
+static void nvmet_pci_epf_poll_cc_work(struct work_struct *work)
+{
+	struct nvmet_pci_epf_ctrl *ctrl =
+		container_of(work, struct nvmet_pci_epf_ctrl, poll_cc.work);
+	u32 old_cc, new_cc;
+	int ret;
+
+	if (!ctrl->tctrl)
+		return;
+
+	old_cc = ctrl->cc;
+	new_cc = nvmet_pci_epf_bar_read32(ctrl, NVME_REG_CC);
+	ctrl->cc = new_cc;
+
+	if (nvmet_cc_en(new_cc) && !nvmet_cc_en(old_cc)) {
+		ret = nvmet_pci_epf_enable_ctrl(ctrl);
+		if (ret)
+			return;
+		ctrl->csts |= NVME_CSTS_RDY;
+	}
+
+	if (!nvmet_cc_en(new_cc) && nvmet_cc_en(old_cc)) {
+		nvmet_pci_epf_disable_ctrl(ctrl);
+		ctrl->csts &= ~NVME_CSTS_RDY;
+	}
+
+	if (nvmet_cc_shn(new_cc) && !nvmet_cc_shn(old_cc)) {
+		nvmet_pci_epf_disable_ctrl(ctrl);
+		ctrl->csts |= NVME_CSTS_SHST_CMPLT;
+	}
+
+	if (!nvmet_cc_shn(new_cc) && nvmet_cc_shn(old_cc))
+		ctrl->csts &= ~NVME_CSTS_SHST_CMPLT;
+
+	nvmet_update_cc(ctrl->tctrl, ctrl->cc);
+	nvmet_pci_epf_bar_write32(ctrl, NVME_REG_CSTS, ctrl->csts);
+
+	schedule_delayed_work(&ctrl->poll_cc, NVMET_PCI_EPF_CC_POLL_INTERVAL);
+}
+
+static void nvmet_pci_epf_init_bar(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	struct nvmet_ctrl *tctrl = ctrl->tctrl;
+
+	ctrl->bar = ctrl->nvme_epf->reg_bar;
+
+	/* Copy the target controller capabilities as a base. */
+	ctrl->cap = tctrl->cap;
+
+	/* Contiguous Queues Required (CQR). */
+	ctrl->cap |= 0x1ULL << 16;
+
+	/* Set Doorbell stride to 4B (DSTRB). */
+	ctrl->cap &= ~GENMASK_ULL(35, 32);
+
+	/* Clear NVM Subsystem Reset Supported (NSSRS). */
+	ctrl->cap &= ~(0x1ULL << 36);
+
+	/* Clear Boot Partition Support (BPS). */
+	ctrl->cap &= ~(0x1ULL << 45);
+
+	/* Clear Persistent Memory Region Supported (PMRS). */
+	ctrl->cap &= ~(0x1ULL << 56);
+
+	/* Clear Controller Memory Buffer Supported (CMBS). */
+	ctrl->cap &= ~(0x1ULL << 57);
+
+	/* Controller configuration. */
+	ctrl->cc = tctrl->cc & (~NVME_CC_ENABLE);
+
+	/* Controller status. */
+	ctrl->csts = ctrl->tctrl->csts;
+
+	nvmet_pci_epf_bar_write64(ctrl, NVME_REG_CAP, ctrl->cap);
+	nvmet_pci_epf_bar_write32(ctrl, NVME_REG_VS, tctrl->subsys->ver);
+	nvmet_pci_epf_bar_write32(ctrl, NVME_REG_CSTS, ctrl->csts);
+	nvmet_pci_epf_bar_write32(ctrl, NVME_REG_CC, ctrl->cc);
+}
+
+static int nvmet_pci_epf_create_ctrl(struct nvmet_pci_epf *nvme_epf,
+				     unsigned int max_nr_queues)
+{
+	struct nvmet_pci_epf_ctrl *ctrl = &nvme_epf->ctrl;
+	struct nvmet_alloc_ctrl_args args = {};
+	char hostnqn[NVMF_NQN_SIZE];
+	uuid_t id;
+	int ret;
+
+	memset(ctrl, 0, sizeof(*ctrl));
+	ctrl->dev = &nvme_epf->epf->dev;
+	mutex_init(&ctrl->irq_lock);
+	ctrl->nvme_epf = nvme_epf;
+	ctrl->mdts = nvme_epf->mdts_kb * SZ_1K;
+	INIT_DELAYED_WORK(&ctrl->poll_cc, nvmet_pci_epf_poll_cc_work);
+	INIT_DELAYED_WORK(&ctrl->poll_sqs, nvmet_pci_epf_poll_sqs_work);
+
+	ret = mempool_init_kmalloc_pool(&ctrl->iod_pool,
+					max_nr_queues * NVMET_MAX_QUEUE_SIZE,
+					sizeof(struct nvmet_pci_epf_iod));
+	if (ret) {
+		dev_err(ctrl->dev, "Failed to initialize IOD mempool\n");
+		return ret;
+	}
+
+	ctrl->port = nvmet_pci_epf_find_port(ctrl, nvme_epf->portid);
+	if (!ctrl->port) {
+		dev_err(ctrl->dev, "Port not found\n");
+		ret = -EINVAL;
+		goto out_mempool_exit;
+	}
+
+	/* Create the target controller. */
+	uuid_gen(&id);
+	snprintf(hostnqn, NVMF_NQN_SIZE,
+		 "nqn.2014-08.org.nvmexpress:uuid:%pUb", &id);
+	args.port = ctrl->port;
+	args.subsysnqn = nvme_epf->subsysnqn;
+	memset(&id, 0, sizeof(uuid_t));
+	args.hostid = &id;
+	args.hostnqn = hostnqn;
+	args.ops = &nvmet_pci_epf_fabrics_ops;
+
+	ctrl->tctrl = nvmet_alloc_ctrl(&args);
+	if (!ctrl->tctrl) {
+		dev_err(ctrl->dev, "Failed to create target controller\n");
+		ret = -ENOMEM;
+		goto out_mempool_exit;
+	}
+	ctrl->tctrl->drvdata = ctrl;
+
+	/* We do not support protection information for now. */
+	if (ctrl->tctrl->pi_support) {
+		dev_err(ctrl->dev,
+			"Protection information (PI) is not supported\n");
+		ret = -ENOTSUPP;
+		goto out_put_ctrl;
+	}
+
+	/* Allocate our queues, up to the maximum number. */
+	ctrl->nr_queues = min(ctrl->tctrl->subsys->max_qid + 1, max_nr_queues);
+	ret = nvmet_pci_epf_alloc_queues(ctrl);
+	if (ret)
+		goto out_put_ctrl;
+
+	/*
+	 * Allocate the IRQ vectors descriptors. We cannot have more than the
+	 * maximum number of queues.
+	 */
+	ret = nvmet_pci_epf_alloc_irq_vectors(ctrl);
+	if (ret)
+		goto out_free_queues;
+
+	dev_info(ctrl->dev,
+		 "New PCI ctrl \"%s\", %u I/O queues, mdts %u B\n",
+		 ctrl->tctrl->subsys->subsysnqn, ctrl->nr_queues - 1,
+		 ctrl->mdts);
+
+	/* Initialize BAR 0 using the target controller CAP. */
+	nvmet_pci_epf_init_bar(ctrl);
+
+	return 0;
+
+out_free_queues:
+	nvmet_pci_epf_free_queues(ctrl);
+out_put_ctrl:
+	nvmet_ctrl_put(ctrl->tctrl);
+	ctrl->tctrl = NULL;
+out_mempool_exit:
+	mempool_exit(&ctrl->iod_pool);
+	return ret;
+}
+
+static void nvmet_pci_epf_start_ctrl(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	schedule_delayed_work(&ctrl->poll_cc, NVMET_PCI_EPF_CC_POLL_INTERVAL);
+}
+
+static void nvmet_pci_epf_stop_ctrl(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	cancel_delayed_work_sync(&ctrl->poll_cc);
+
+	nvmet_pci_epf_disable_ctrl(ctrl);
+}
+
+static void nvmet_pci_epf_destroy_ctrl(struct nvmet_pci_epf_ctrl *ctrl)
+{
+	if (!ctrl->tctrl)
+		return;
+
+	dev_info(ctrl->dev, "Destroying PCI ctrl \"%s\"\n",
+		 ctrl->tctrl->subsys->subsysnqn);
+
+	nvmet_pci_epf_stop_ctrl(ctrl);
+
+	nvmet_pci_epf_free_queues(ctrl);
+	nvmet_pci_epf_free_irq_vectors(ctrl);
+
+	nvmet_ctrl_put(ctrl->tctrl);
+	ctrl->tctrl = NULL;
+
+	mempool_exit(&ctrl->iod_pool);
+}
+
+static int nvmet_pci_epf_configure_bar(struct nvmet_pci_epf *nvme_epf)
+{
+	struct pci_epf *epf = nvme_epf->epf;
+	const struct pci_epc_features *epc_features = nvme_epf->epc_features;
+	size_t reg_size, reg_bar_size;
+	size_t msix_table_size = 0;
+
+	/*
+	 * The first free BAR will be our register BAR and per NVMe
+	 * specifications, it must be BAR 0.
+	 */
+	if (pci_epc_get_first_free_bar(epc_features) != BAR_0) {
+		dev_err(&epf->dev, "BAR 0 is not free\n");
+		return -ENODEV;
+	}
+
+	if (epc_features->bar[BAR_0].only_64bit)
+		epf->bar[BAR_0].flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
+
+	/*
+	 * Calculate the size of the register bar: NVMe registers first with
+	 * enough space for the doorbells, followed by the MSI-X table
+	 * if supported.
+	 */
+	reg_size = NVME_REG_DBS + (NVMET_NR_QUEUES * 2 * sizeof(u32));
+	reg_size = ALIGN(reg_size, 8);
+
+	if (epc_features->msix_capable) {
+		size_t pba_size;
+
+		msix_table_size = PCI_MSIX_ENTRY_SIZE * epf->msix_interrupts;
+		nvme_epf->msix_table_offset = reg_size;
+		pba_size = ALIGN(DIV_ROUND_UP(epf->msix_interrupts, 8), 8);
+
+		reg_size += msix_table_size + pba_size;
+	}
+
+	if (epc_features->bar[BAR_0].type == BAR_FIXED) {
+		if (reg_size > epc_features->bar[BAR_0].fixed_size) {
+			dev_err(&epf->dev,
+				"BAR 0 size %llu B too small, need %zu B\n",
+				epc_features->bar[BAR_0].fixed_size,
+				reg_size);
+			return -ENOMEM;
+		}
+		reg_bar_size = epc_features->bar[BAR_0].fixed_size;
+	} else {
+		reg_bar_size = ALIGN(reg_size, max(epc_features->align, 4096));
+	}
+
+	nvme_epf->reg_bar = pci_epf_alloc_space(epf, reg_bar_size, BAR_0,
+						epc_features, PRIMARY_INTERFACE);
+	if (!nvme_epf->reg_bar) {
+		dev_err(&epf->dev, "Failed to allocate BAR 0\n");
+		return -ENOMEM;
+	}
+	memset(nvme_epf->reg_bar, 0, reg_bar_size);
+
+	return 0;
+}
+
+static void nvmet_pci_epf_free_bar(struct nvmet_pci_epf *nvme_epf)
+{
+	struct pci_epf *epf = nvme_epf->epf;
+
+	if (!nvme_epf->reg_bar)
+		return;
+
+	pci_epf_free_space(epf, nvme_epf->reg_bar, BAR_0, PRIMARY_INTERFACE);
+	nvme_epf->reg_bar = NULL;
+}
+
+static void nvmet_pci_epf_clear_bar(struct nvmet_pci_epf *nvme_epf)
+{
+	struct pci_epf *epf = nvme_epf->epf;
+
+	pci_epc_clear_bar(epf->epc, epf->func_no, epf->vfunc_no,
+			  &epf->bar[BAR_0]);
+}
+
+static int nvmet_pci_epf_init_irq(struct nvmet_pci_epf *nvme_epf)
+{
+	const struct pci_epc_features *epc_features = nvme_epf->epc_features;
+	struct pci_epf *epf = nvme_epf->epf;
+	int ret;
+
+	/* Enable MSI-X if supported, otherwise, use MSI. */
+	if (epc_features->msix_capable && epf->msix_interrupts) {
+		ret = pci_epc_set_msix(epf->epc, epf->func_no, epf->vfunc_no,
+				       epf->msix_interrupts, BAR_0,
+				       nvme_epf->msix_table_offset);
+		if (ret) {
+			dev_err(&epf->dev, "Failed to configure MSI-X\n");
+			return ret;
+		}
+
+		nvme_epf->nr_vectors = epf->msix_interrupts;
+		nvme_epf->irq_type = PCI_IRQ_MSIX;
+
+		return 0;
+	}
+
+	if (epc_features->msi_capable && epf->msi_interrupts) {
+		ret = pci_epc_set_msi(epf->epc, epf->func_no, epf->vfunc_no,
+				      epf->msi_interrupts);
+		if (ret) {
+			dev_err(&epf->dev, "Failed to configure MSI\n");
+			return ret;
+		}
+
+		nvme_epf->nr_vectors = epf->msi_interrupts;
+		nvme_epf->irq_type = PCI_IRQ_MSI;
+
+		return 0;
+	}
+
+	/* MSI and MSI-X are not supported: fall back to INTx. */
+	nvme_epf->nr_vectors = 1;
+	nvme_epf->irq_type = PCI_IRQ_INTX;
+
+	return 0;
+}
+
+static int nvmet_pci_epf_epc_init(struct pci_epf *epf)
+{
+	struct nvmet_pci_epf *nvme_epf = epf_get_drvdata(epf);
+	const struct pci_epc_features *epc_features = nvme_epf->epc_features;
+	struct nvmet_pci_epf_ctrl *ctrl = &nvme_epf->ctrl;
+	unsigned int max_nr_queues = NVMET_NR_QUEUES;
+	int ret;
+
+	/* For now, do not support virtual functions. */
+	if (epf->vfunc_no > 0) {
+		dev_err(&epf->dev, "Virtual functions are not supported\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Cap the maximum number of queues we can support on the controller
+	 * with the number of IRQs we can use.
+	 */
+	if (epc_features->msix_capable && epf->msix_interrupts) {
+		dev_info(&epf->dev,
+			 "PCI endpoint controller supports MSI-X, %u vectors\n",
+			 epf->msix_interrupts);
+		max_nr_queues = min(max_nr_queues, epf->msix_interrupts);
+	} else if (epc_features->msi_capable && epf->msi_interrupts) {
+		dev_info(&epf->dev,
+			 "PCI endpoint controller supports MSI, %u vectors\n",
+			 epf->msi_interrupts);
+		max_nr_queues = min(max_nr_queues, epf->msi_interrupts);
+	}
+
+	if (max_nr_queues < 2) {
+		dev_err(&epf->dev, "Invalid maximum number of queues %u\n",
+			max_nr_queues);
+		return -EINVAL;
+	}
+
+	/* Create the target controller. */
+	ret = nvmet_pci_epf_create_ctrl(nvme_epf, max_nr_queues);
+	if (ret) {
+		dev_err(&epf->dev,
+			"Failed to create NVMe PCI target controller (err=%d)\n",
+			ret);
+		return ret;
+	}
+
+	/* Set device ID, class, etc. */
+	epf->header->vendorid = ctrl->tctrl->subsys->vendor_id;
+	epf->header->subsys_vendor_id = ctrl->tctrl->subsys->subsys_vendor_id;
+	ret = pci_epc_write_header(epf->epc, epf->func_no, epf->vfunc_no,
+				   epf->header);
+	if (ret) {
+		dev_err(&epf->dev,
+			"Failed to write configuration header (err=%d)\n", ret);
+		goto out_destroy_ctrl;
+	}
+
+	ret = pci_epc_set_bar(epf->epc, epf->func_no, epf->vfunc_no,
+			      &epf->bar[BAR_0]);
+	if (ret) {
+		dev_err(&epf->dev, "Failed to set BAR 0 (err=%d)\n", ret);
+		goto out_destroy_ctrl;
+	}
+
+	/*
+	 * Enable interrupts and start polling the controller BAR if we do not
+	 * have a link up notifier.
+	 */
+	ret = nvmet_pci_epf_init_irq(nvme_epf);
+	if (ret)
+		goto out_clear_bar;
+
+	if (!epc_features->linkup_notifier) {
+		ctrl->link_up = true;
+		nvmet_pci_epf_start_ctrl(&nvme_epf->ctrl);
+	}
+
+	return 0;
+
+out_clear_bar:
+	nvmet_pci_epf_clear_bar(nvme_epf);
+out_destroy_ctrl:
+	nvmet_pci_epf_destroy_ctrl(&nvme_epf->ctrl);
+	return ret;
+}
+
+static void nvmet_pci_epf_epc_deinit(struct pci_epf *epf)
+{
+	struct nvmet_pci_epf *nvme_epf = epf_get_drvdata(epf);
+	struct nvmet_pci_epf_ctrl *ctrl = &nvme_epf->ctrl;
+
+	ctrl->link_up = false;
+	nvmet_pci_epf_destroy_ctrl(ctrl);
+
+	nvmet_pci_epf_deinit_dma(nvme_epf);
+	nvmet_pci_epf_clear_bar(nvme_epf);
+}
+
+static int nvmet_pci_epf_link_up(struct pci_epf *epf)
+{
+	struct nvmet_pci_epf *nvme_epf = epf_get_drvdata(epf);
+	struct nvmet_pci_epf_ctrl *ctrl = &nvme_epf->ctrl;
+
+	ctrl->link_up = true;
+	nvmet_pci_epf_start_ctrl(ctrl);
+
+	return 0;
+}
+
+static int nvmet_pci_epf_link_down(struct pci_epf *epf)
+{
+	struct nvmet_pci_epf *nvme_epf = epf_get_drvdata(epf);
+	struct nvmet_pci_epf_ctrl *ctrl = &nvme_epf->ctrl;
+
+	ctrl->link_up = false;
+	nvmet_pci_epf_stop_ctrl(ctrl);
+
+	return 0;
+}
+
+static const struct pci_epc_event_ops nvmet_pci_epf_event_ops = {
+	.epc_init = nvmet_pci_epf_epc_init,
+	.epc_deinit = nvmet_pci_epf_epc_deinit,
+	.link_up = nvmet_pci_epf_link_up,
+	.link_down = nvmet_pci_epf_link_down,
+};
+
+static int nvmet_pci_epf_bind(struct pci_epf *epf)
+{
+	struct nvmet_pci_epf *nvme_epf = epf_get_drvdata(epf);
+	const struct pci_epc_features *epc_features;
+	struct pci_epc *epc = epf->epc;
+	int ret;
+
+	if (WARN_ON_ONCE(!epc))
+		return -EINVAL;
+
+	epc_features = pci_epc_get_features(epc, epf->func_no, epf->vfunc_no);
+	if (!epc_features) {
+		dev_err(&epf->dev, "epc_features not implemented\n");
+		return -EOPNOTSUPP;
+	}
+	nvme_epf->epc_features = epc_features;
+
+	ret = nvmet_pci_epf_configure_bar(nvme_epf);
+	if (ret)
+		return ret;
+
+	nvmet_pci_epf_init_dma(nvme_epf);
+
+	return 0;
+}
+
+static void nvmet_pci_epf_unbind(struct pci_epf *epf)
+{
+	struct nvmet_pci_epf *nvme_epf = epf_get_drvdata(epf);
+	struct pci_epc *epc = epf->epc;
+
+	nvmet_pci_epf_destroy_ctrl(&nvme_epf->ctrl);
+
+	if (epc->init_complete) {
+		nvmet_pci_epf_deinit_dma(nvme_epf);
+		nvmet_pci_epf_clear_bar(nvme_epf);
+	}
+
+	nvmet_pci_epf_free_bar(nvme_epf);
+}
+
+static struct pci_epf_header nvme_epf_pci_header = {
+	.vendorid	= PCI_ANY_ID,
+	.deviceid	= PCI_ANY_ID,
+	.progif_code	= 0x02, /* NVM Express */
+	.baseclass_code = PCI_BASE_CLASS_STORAGE,
+	.subclass_code	= 0x08, /* Non-Volatile Memory controller */
+	.interrupt_pin	= PCI_INTERRUPT_INTA,
+};
+
+static int nvmet_pci_epf_probe(struct pci_epf *epf,
+			       const struct pci_epf_device_id *id)
+{
+	struct nvmet_pci_epf *nvme_epf;
+	int ret;
+
+	nvme_epf = devm_kzalloc(&epf->dev, sizeof(*nvme_epf), GFP_KERNEL);
+	if (!nvme_epf)
+		return -ENOMEM;
+
+	ret = devm_mutex_init(&epf->dev, &nvme_epf->mmio_lock);
+	if (ret)
+		return ret;
+
+	nvme_epf->epf = epf;
+	nvme_epf->mdts_kb = NVMET_PCI_EPF_MDTS_KB;
+
+	epf->event_ops = &nvmet_pci_epf_event_ops;
+	epf->header = &nvme_epf_pci_header;
+	epf_set_drvdata(epf, nvme_epf);
+
+	return 0;
+}
+
+#define to_nvme_epf(epf_group)	\
+	container_of(epf_group, struct nvmet_pci_epf, group)
+
+static ssize_t nvmet_pci_epf_portid_show(struct config_item *item, char *page)
+{
+	struct config_group *group = to_config_group(item);
+	struct nvmet_pci_epf *nvme_epf = to_nvme_epf(group);
+
+	return sysfs_emit(page, "%u\n", le16_to_cpu(nvme_epf->portid));
+}
+
+static ssize_t nvmet_pci_epf_portid_store(struct config_item *item,
+					  const char *page, size_t len)
+{
+	struct config_group *group = to_config_group(item);
+	struct nvmet_pci_epf *nvme_epf = to_nvme_epf(group);
+	u16 portid;
+
+	/* Do not allow setting this when the function is already started. */
+	if (nvme_epf->ctrl.tctrl)
+		return -EBUSY;
+
+	if (!len)
+		return -EINVAL;
+
+	if (kstrtou16(page, 0, &portid))
+		return -EINVAL;
+
+	nvme_epf->portid = cpu_to_le16(portid);
+
+	return len;
+}
+
+CONFIGFS_ATTR(nvmet_pci_epf_, portid);
+
+static ssize_t nvmet_pci_epf_subsysnqn_show(struct config_item *item,
+					    char *page)
+{
+	struct config_group *group = to_config_group(item);
+	struct nvmet_pci_epf *nvme_epf = to_nvme_epf(group);
+
+	return sysfs_emit(page, "%s\n", nvme_epf->subsysnqn);
+}
+
+static ssize_t nvmet_pci_epf_subsysnqn_store(struct config_item *item,
+					     const char *page, size_t len)
+{
+	struct config_group *group = to_config_group(item);
+	struct nvmet_pci_epf *nvme_epf = to_nvme_epf(group);
+
+	/* Do not allow setting this when the function is already started. */
+	if (nvme_epf->ctrl.tctrl)
+		return -EBUSY;
+
+	if (!len)
+		return -EINVAL;
+
+	strscpy(nvme_epf->subsysnqn, page, len);
+
+	return len;
+}
+
+CONFIGFS_ATTR(nvmet_pci_epf_, subsysnqn);
+
+static ssize_t nvmet_pci_epf_mdts_kb_show(struct config_item *item, char *page)
+{
+	struct config_group *group = to_config_group(item);
+	struct nvmet_pci_epf *nvme_epf = to_nvme_epf(group);
+
+	return sysfs_emit(page, "%u\n", nvme_epf->mdts_kb);
+}
+
+static ssize_t nvmet_pci_epf_mdts_kb_store(struct config_item *item,
+					   const char *page, size_t len)
+{
+	struct config_group *group = to_config_group(item);
+	struct nvmet_pci_epf *nvme_epf = to_nvme_epf(group);
+	unsigned long mdts_kb;
+	int ret;
+
+	if (nvme_epf->ctrl.tctrl)
+		return -EBUSY;
+
+	ret = kstrtoul(page, 0, &mdts_kb);
+	if (ret)
+		return ret;
+	if (!mdts_kb)
+		mdts_kb = NVMET_PCI_EPF_MDTS_KB;
+	else if (mdts_kb > NVMET_PCI_EPF_MAX_MDTS_KB)
+		mdts_kb = NVMET_PCI_EPF_MAX_MDTS_KB;
+
+	if (!is_power_of_2(mdts_kb))
+		return -EINVAL;
+
+	nvme_epf->mdts_kb = mdts_kb;
+
+	return len;
+}
+
+CONFIGFS_ATTR(nvmet_pci_epf_, mdts_kb);
+
+static struct configfs_attribute *nvmet_pci_epf_attrs[] = {
+	&nvmet_pci_epf_attr_portid,
+	&nvmet_pci_epf_attr_subsysnqn,
+	&nvmet_pci_epf_attr_mdts_kb,
+	NULL,
+};
+
+static const struct config_item_type nvmet_pci_epf_group_type = {
+	.ct_attrs	= nvmet_pci_epf_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+static struct config_group *nvmet_pci_epf_add_cfs(struct pci_epf *epf,
+						  struct config_group *group)
+{
+	struct nvmet_pci_epf *nvme_epf = epf_get_drvdata(epf);
+
+	config_group_init_type_name(&nvme_epf->group, "nvme",
+				    &nvmet_pci_epf_group_type);
+
+	return &nvme_epf->group;
+}
+
+static const struct pci_epf_device_id nvmet_pci_epf_ids[] = {
+	{ .name = "nvmet_pci_epf" },
+	{},
+};
+
+static struct pci_epf_ops nvmet_pci_epf_ops = {
+	.bind	= nvmet_pci_epf_bind,
+	.unbind	= nvmet_pci_epf_unbind,
+	.add_cfs = nvmet_pci_epf_add_cfs,
+};
+
+static struct pci_epf_driver nvmet_pci_epf_driver = {
+	.driver.name	= "nvmet_pci_epf",
+	.probe		= nvmet_pci_epf_probe,
+	.id_table	= nvmet_pci_epf_ids,
+	.ops		= &nvmet_pci_epf_ops,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nvmet_pci_epf_init_module(void)
+{
+	int ret;
+
+	ret = pci_epf_register_driver(&nvmet_pci_epf_driver);
+	if (ret)
+		return ret;
+
+	ret = nvmet_register_transport(&nvmet_pci_epf_fabrics_ops);
+	if (ret) {
+		pci_epf_unregister_driver(&nvmet_pci_epf_driver);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void __exit nvmet_pci_epf_cleanup_module(void)
+{
+	nvmet_unregister_transport(&nvmet_pci_epf_fabrics_ops);
+	pci_epf_unregister_driver(&nvmet_pci_epf_driver);
+}
+
+module_init(nvmet_pci_epf_init_module);
+module_exit(nvmet_pci_epf_cleanup_module);
+
+MODULE_DESCRIPTION("NVMe PCI Endpoint Function target driver");
+MODULE_AUTHOR("Damien Le Moal <dlemoal@kernel.org>");
+MODULE_LICENSE("GPL");
