crypto: cavium - Add the Virtual Function driver for CPT

Enable the CPT VF driver. CPT is the cryptographic Acceleration Unit
in Octeon-tx series of processors.

Signed-off-by: George Cherian <george.cherian@cavium.com>
Reviewed-by: David Daney <david.daney@cavium.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 936 insertions, 0 deletions

diff --git a/drivers/crypto/cavium/cpt/cptvf_main.c b/drivers/crypto/cavium/cpt/cptvf_main.c
new file mode 100644
index 000000000000..527bdc3c2969
--- /dev/null
+++ b/drivers/crypto/cavium/cpt/cptvf_main.c
@@ -0,0 +1,936 @@
+/*
+ * Copyright (C) 2016 Cavium, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+
+#include "cptvf.h"
+
+#define DRV_NAME	"thunder-cptvf"
+#define DRV_VERSION	"1.0"
+
+struct cptvf_wqe {
+	struct tasklet_struct twork;
+	void *cptvf;
+	u32 qno;
+};
+
+struct cptvf_wqe_info {
+	struct cptvf_wqe vq_wqe[CPT_NUM_QS_PER_VF];
+};
+
+static void vq_work_handler(unsigned long data)
+{
+	struct cptvf_wqe_info *cwqe_info = (struct cptvf_wqe_info *)data;
+	struct cptvf_wqe *cwqe = &cwqe_info->vq_wqe[0];
+
+	vq_post_process(cwqe->cptvf, cwqe->qno);
+}
+
+static int init_worker_threads(struct cpt_vf *cptvf)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	struct cptvf_wqe_info *cwqe_info;
+	int i;
+
+	cwqe_info = kzalloc(sizeof(*cwqe_info), GFP_KERNEL);
+	if (!cwqe_info)
+		return -ENOMEM;
+
+	if (cptvf->nr_queues) {
+		dev_info(&pdev->dev, "Creating VQ worker threads (%d)\n",
+			 cptvf->nr_queues);
+	}
+
+	for (i = 0; i < cptvf->nr_queues; i++) {
+		tasklet_init(&cwqe_info->vq_wqe[i].twork, vq_work_handler,
+			     (u64)cwqe_info);
+		cwqe_info->vq_wqe[i].qno = i;
+		cwqe_info->vq_wqe[i].cptvf = cptvf;
+	}
+
+	cptvf->wqe_info = cwqe_info;
+
+	return 0;
+}
+
+static void cleanup_worker_threads(struct cpt_vf *cptvf)
+{
+	struct cptvf_wqe_info *cwqe_info;
+	struct pci_dev *pdev = cptvf->pdev;
+	int i;
+
+	cwqe_info = (struct cptvf_wqe_info *)cptvf->wqe_info;
+	if (!cwqe_info)
+		return;
+
+	if (cptvf->nr_queues) {
+		dev_info(&pdev->dev, "Cleaning VQ worker threads (%u)\n",
+			 cptvf->nr_queues);
+	}
+
+	for (i = 0; i < cptvf->nr_queues; i++)
+		tasklet_kill(&cwqe_info->vq_wqe[i].twork);
+
+	kzfree(cwqe_info);
+	cptvf->wqe_info = NULL;
+}
+
+static void free_pending_queues(struct pending_qinfo *pqinfo)
+{
+	int i;
+	struct pending_queue *queue;
+
+	for_each_pending_queue(pqinfo, queue, i) {
+		if (!queue->head)
+			continue;
+
+		/* free single queue */
+		kzfree((queue->head));
+
+		queue->front = 0;
+		queue->rear = 0;
+
+		return;
+	}
+
+	pqinfo->qlen = 0;
+	pqinfo->nr_queues = 0;
+}
+
+static int alloc_pending_queues(struct pending_qinfo *pqinfo, u32 qlen,
+				u32 nr_queues)
+{
+	u32 i;
+	size_t size;
+	int ret;
+	struct pending_queue *queue = NULL;
+
+	pqinfo->nr_queues = nr_queues;
+	pqinfo->qlen = qlen;
+
+	size = (qlen * sizeof(struct pending_entry));
+
+	for_each_pending_queue(pqinfo, queue, i) {
+		queue->head = kzalloc((size), GFP_KERNEL);
+		if (!queue->head) {
+			ret = -ENOMEM;
+			goto pending_qfail;
+		}
+
+		queue->front = 0;
+		queue->rear = 0;
+		atomic64_set((&queue->pending_count), (0));
+
+		/* init queue spin lock */
+		spin_lock_init(&queue->lock);
+	}
+
+	return 0;
+
+pending_qfail:
+	free_pending_queues(pqinfo);
+
+	return ret;
+}
+
+static int init_pending_queues(struct cpt_vf *cptvf, u32 qlen, u32 nr_queues)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	int ret;
+
+	if (!nr_queues)
+		return 0;
+
+	ret = alloc_pending_queues(&cptvf->pqinfo, qlen, nr_queues);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to setup pending queues (%u)\n",
+			nr_queues);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void cleanup_pending_queues(struct cpt_vf *cptvf)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+
+	if (!cptvf->nr_queues)
+		return;
+
+	dev_info(&pdev->dev, "Cleaning VQ pending queue (%u)\n",
+		 cptvf->nr_queues);
+	free_pending_queues(&cptvf->pqinfo);
+}
+
+static void free_command_queues(struct cpt_vf *cptvf,
+				struct command_qinfo *cqinfo)
+{
+	int i;
+	struct command_queue *queue = NULL;
+	struct command_chunk *chunk = NULL;
+	struct pci_dev *pdev = cptvf->pdev;
+	struct hlist_node *node;
+
+	/* clean up for each queue */
+	for (i = 0; i < cptvf->nr_queues; i++) {
+		queue = &cqinfo->queue[i];
+		if (hlist_empty(&cqinfo->queue[i].chead))
+			continue;
+
+		hlist_for_each_entry_safe(chunk, node, &cqinfo->queue[i].chead,
+					  nextchunk) {
+			dma_free_coherent(&pdev->dev, chunk->size,
+					  chunk->head,
+					  chunk->dma_addr);
+			chunk->head = NULL;
+			chunk->dma_addr = 0;
+			hlist_del(&chunk->nextchunk);
+			kzfree(chunk);
+		}
+
+		queue->nchunks = 0;
+		queue->idx = 0;
+	}
+
+	/* common cleanup */
+	cqinfo->cmd_size = 0;
+}
+
+static int alloc_command_queues(struct cpt_vf *cptvf,
+				struct command_qinfo *cqinfo, size_t cmd_size,
+				u32 qlen)
+{
+	int i;
+	size_t q_size;
+	struct command_queue *queue = NULL;
+	struct pci_dev *pdev = cptvf->pdev;
+
+	/* common init */
+	cqinfo->cmd_size = cmd_size;
+	/* Qsize in dwords, needed for SADDR config, 1-next chunk pointer */
+	cptvf->qsize = min(qlen, cqinfo->qchunksize) *
+			CPT_NEXT_CHUNK_PTR_SIZE + 1;
+	/* Qsize in bytes to create space for alignment */
+	q_size = qlen * cqinfo->cmd_size;
+
+	/* per queue initialization */
+	for (i = 0; i < cptvf->nr_queues; i++) {
+		size_t c_size = 0;
+		size_t rem_q_size = q_size;
+		struct command_chunk *curr = NULL, *first = NULL, *last = NULL;
+		u32 qcsize_bytes = cqinfo->qchunksize * cqinfo->cmd_size;
+
+		queue = &cqinfo->queue[i];
+		INIT_HLIST_HEAD(&cqinfo->queue[i].chead);
+		do {
+			curr = kzalloc(sizeof(*curr), GFP_KERNEL);
+			if (!curr)
+				goto cmd_qfail;
+
+			c_size = (rem_q_size > qcsize_bytes) ? qcsize_bytes :
+					rem_q_size;
+			curr->head = (u8 *)dma_zalloc_coherent(&pdev->dev,
+					  c_size + CPT_NEXT_CHUNK_PTR_SIZE,
+					  &curr->dma_addr, GFP_KERNEL);
+			if (!curr->head) {
+				dev_err(&pdev->dev, "Command Q (%d) chunk (%d) allocation failed\n",
+					i, queue->nchunks);
+				goto cmd_qfail;
+			}
+
+			curr->size = c_size;
+			if (queue->nchunks == 0) {
+				hlist_add_head(&curr->nextchunk,
+					       &cqinfo->queue[i].chead);
+				first = curr;
+			} else {
+				hlist_add_behind(&curr->nextchunk,
+						 &last->nextchunk);
+			}
+
+			queue->nchunks++;
+			rem_q_size -= c_size;
+			if (last)
+				*((u64 *)(&last->head[last->size])) = (u64)curr->dma_addr;
+
+			last = curr;
+		} while (rem_q_size);
+
+		/* Make the queue circular */
+		/* Tie back last chunk entry to head */
+		curr = first;
+		*((u64 *)(&last->head[last->size])) = (u64)curr->dma_addr;
+		queue->qhead = curr;
+		spin_lock_init(&queue->lock);
+	}
+	return 0;
+
+cmd_qfail:
+	free_command_queues(cptvf, cqinfo);
+	return -ENOMEM;
+}
+
+static int init_command_queues(struct cpt_vf *cptvf, u32 qlen)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	int ret;
+
+	/* setup AE command queues */
+	ret = alloc_command_queues(cptvf, &cptvf->cqinfo, CPT_INST_SIZE,
+				   qlen);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to allocate AE command queues (%u)\n",
+			cptvf->nr_queues);
+		return ret;
+	}
+
+	return ret;
+}
+
+static void cleanup_command_queues(struct cpt_vf *cptvf)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+
+	if (!cptvf->nr_queues)
+		return;
+
+	dev_info(&pdev->dev, "Cleaning VQ command queue (%u)\n",
+		 cptvf->nr_queues);
+	free_command_queues(cptvf, &cptvf->cqinfo);
+}
+
+static void cptvf_sw_cleanup(struct cpt_vf *cptvf)
+{
+	cleanup_worker_threads(cptvf);
+	cleanup_pending_queues(cptvf);
+	cleanup_command_queues(cptvf);
+}
+
+static int cptvf_sw_init(struct cpt_vf *cptvf, u32 qlen, u32 nr_queues)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	int ret = 0;
+	u32 max_dev_queues = 0;
+
+	max_dev_queues = CPT_NUM_QS_PER_VF;
+	/* possible cpus */
+	nr_queues = min_t(u32, nr_queues, max_dev_queues);
+	cptvf->nr_queues = nr_queues;
+
+	ret = init_command_queues(cptvf, qlen);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to setup command queues (%u)\n",
+			nr_queues);
+		return ret;
+	}
+
+	ret = init_pending_queues(cptvf, qlen, nr_queues);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to setup pending queues (%u)\n",
+			nr_queues);
+		goto setup_pqfail;
+	}
+
+	/* Create worker threads for BH processing */
+	ret = init_worker_threads(cptvf);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to setup worker threads\n");
+		goto init_work_fail;
+	}
+
+	return 0;
+
+init_work_fail:
+	cleanup_worker_threads(cptvf);
+	cleanup_pending_queues(cptvf);
+
+setup_pqfail:
+	cleanup_command_queues(cptvf);
+
+	return ret;
+}
+
+static void cptvf_disable_msix(struct cpt_vf *cptvf)
+{
+	if (cptvf->msix_enabled) {
+		pci_disable_msix(cptvf->pdev);
+		cptvf->msix_enabled = 0;
+	}
+}
+
+static int cptvf_enable_msix(struct cpt_vf *cptvf)
+{
+	int i, ret;
+
+	for (i = 0; i < CPT_VF_MSIX_VECTORS; i++)
+		cptvf->msix_entries[i].entry = i;
+
+	ret = pci_enable_msix(cptvf->pdev, cptvf->msix_entries,
+			      CPT_VF_MSIX_VECTORS);
+	if (ret) {
+		dev_err(&cptvf->pdev->dev, "Request for #%d msix vectors failed\n",
+			CPT_VF_MSIX_VECTORS);
+		return ret;
+	}
+
+	cptvf->msix_enabled = 1;
+	/* Mark MSIX enabled */
+	cptvf->flags |= CPT_FLAG_MSIX_ENABLED;
+
+	return 0;
+}
+
+static void cptvf_free_all_interrupts(struct cpt_vf *cptvf)
+{
+	int irq;
+
+	for (irq = 0; irq < CPT_VF_MSIX_VECTORS; irq++) {
+		if (cptvf->irq_allocated[irq])
+			irq_set_affinity_hint(cptvf->msix_entries[irq].vector,
+					      NULL);
+		free_cpumask_var(cptvf->affinity_mask[irq]);
+		free_irq(cptvf->msix_entries[irq].vector, cptvf);
+		cptvf->irq_allocated[irq] = false;
+	}
+}
+
+static void cptvf_write_vq_ctl(struct cpt_vf *cptvf, bool val)
+{
+	union cptx_vqx_ctl vqx_ctl;
+
+	vqx_ctl.u = cpt_read_csr64(cptvf->reg_base, CPTX_VQX_CTL(0, 0));
+	vqx_ctl.s.ena = val;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_CTL(0, 0), vqx_ctl.u);
+}
+
+void cptvf_write_vq_doorbell(struct cpt_vf *cptvf, u32 val)
+{
+	union cptx_vqx_doorbell vqx_dbell;
+
+	vqx_dbell.u = cpt_read_csr64(cptvf->reg_base,
+				     CPTX_VQX_DOORBELL(0, 0));
+	vqx_dbell.s.dbell_cnt = val * 8; /* Num of Instructions * 8 words */
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_DOORBELL(0, 0),
+			vqx_dbell.u);
+}
+
+static void cptvf_write_vq_inprog(struct cpt_vf *cptvf, u8 val)
+{
+	union cptx_vqx_inprog vqx_inprg;
+
+	vqx_inprg.u = cpt_read_csr64(cptvf->reg_base, CPTX_VQX_INPROG(0, 0));
+	vqx_inprg.s.inflight = val;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_INPROG(0, 0), vqx_inprg.u);
+}
+
+static void cptvf_write_vq_done_numwait(struct cpt_vf *cptvf, u32 val)
+{
+	union cptx_vqx_done_wait vqx_dwait;
+
+	vqx_dwait.u = cpt_read_csr64(cptvf->reg_base,
+				     CPTX_VQX_DONE_WAIT(0, 0));
+	vqx_dwait.s.num_wait = val;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_DONE_WAIT(0, 0),
+			vqx_dwait.u);
+}
+
+static void cptvf_write_vq_done_timewait(struct cpt_vf *cptvf, u16 time)
+{
+	union cptx_vqx_done_wait vqx_dwait;
+
+	vqx_dwait.u = cpt_read_csr64(cptvf->reg_base,
+				     CPTX_VQX_DONE_WAIT(0, 0));
+	vqx_dwait.s.time_wait = time;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_DONE_WAIT(0, 0),
+			vqx_dwait.u);
+}
+
+static void cptvf_enable_swerr_interrupts(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_misc_ena_w1s vqx_misc_ena;
+
+	vqx_misc_ena.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_MISC_ENA_W1S(0, 0));
+	/* Set mbox(0) interupts for the requested vf */
+	vqx_misc_ena.s.swerr = 1;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_MISC_ENA_W1S(0, 0),
+			vqx_misc_ena.u);
+}
+
+static void cptvf_enable_mbox_interrupts(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_misc_ena_w1s vqx_misc_ena;
+
+	vqx_misc_ena.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_MISC_ENA_W1S(0, 0));
+	/* Set mbox(0) interupts for the requested vf */
+	vqx_misc_ena.s.mbox = 1;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_MISC_ENA_W1S(0, 0),
+			vqx_misc_ena.u);
+}
+
+static void cptvf_enable_done_interrupts(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_done_ena_w1s vqx_done_ena;
+
+	vqx_done_ena.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_DONE_ENA_W1S(0, 0));
+	/* Set DONE interrupt for the requested vf */
+	vqx_done_ena.s.done = 1;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_DONE_ENA_W1S(0, 0),
+			vqx_done_ena.u);
+}
+
+static void cptvf_clear_dovf_intr(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_misc_int vqx_misc_int;
+
+	vqx_misc_int.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_MISC_INT(0, 0));
+	/* W1C for the VF */
+	vqx_misc_int.s.dovf = 1;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_MISC_INT(0, 0),
+			vqx_misc_int.u);
+}
+
+static void cptvf_clear_irde_intr(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_misc_int vqx_misc_int;
+
+	vqx_misc_int.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_MISC_INT(0, 0));
+	/* W1C for the VF */
+	vqx_misc_int.s.irde = 1;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_MISC_INT(0, 0),
+			vqx_misc_int.u);
+}
+
+static void cptvf_clear_nwrp_intr(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_misc_int vqx_misc_int;
+
+	vqx_misc_int.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_MISC_INT(0, 0));
+	/* W1C for the VF */
+	vqx_misc_int.s.nwrp = 1;
+	cpt_write_csr64(cptvf->reg_base,
+			CPTX_VQX_MISC_INT(0, 0), vqx_misc_int.u);
+}
+
+static void cptvf_clear_mbox_intr(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_misc_int vqx_misc_int;
+
+	vqx_misc_int.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_MISC_INT(0, 0));
+	/* W1C for the VF */
+	vqx_misc_int.s.mbox = 1;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_MISC_INT(0, 0),
+			vqx_misc_int.u);
+}
+
+static void cptvf_clear_swerr_intr(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_misc_int vqx_misc_int;
+
+	vqx_misc_int.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_MISC_INT(0, 0));
+	/* W1C for the VF */
+	vqx_misc_int.s.swerr = 1;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_MISC_INT(0, 0),
+			vqx_misc_int.u);
+}
+
+static u64 cptvf_read_vf_misc_intr_status(struct cpt_vf *cptvf)
+{
+	return cpt_read_csr64(cptvf->reg_base, CPTX_VQX_MISC_INT(0, 0));
+}
+
+static irqreturn_t cptvf_misc_intr_handler(int irq, void *cptvf_irq)
+{
+	struct cpt_vf *cptvf = (struct cpt_vf *)cptvf_irq;
+	struct pci_dev *pdev = cptvf->pdev;
+	u64 intr;
+
+	intr = cptvf_read_vf_misc_intr_status(cptvf);
+	/*Check for MISC interrupt types*/
+	if (likely(intr & CPT_VF_INTR_MBOX_MASK)) {
+		dev_err(&pdev->dev, "Mailbox interrupt 0x%llx on CPT VF %d\n",
+			intr, cptvf->vfid);
+		cptvf_handle_mbox_intr(cptvf);
+		cptvf_clear_mbox_intr(cptvf);
+	} else if (unlikely(intr & CPT_VF_INTR_DOVF_MASK)) {
+		cptvf_clear_dovf_intr(cptvf);
+		/*Clear doorbell count*/
+		cptvf_write_vq_doorbell(cptvf, 0);
+		dev_err(&pdev->dev, "Doorbell overflow error interrupt 0x%llx on CPT VF %d\n",
+			intr, cptvf->vfid);
+	} else if (unlikely(intr & CPT_VF_INTR_IRDE_MASK)) {
+		cptvf_clear_irde_intr(cptvf);
+		dev_err(&pdev->dev, "Instruction NCB read error interrupt 0x%llx on CPT VF %d\n",
+			intr, cptvf->vfid);
+	} else if (unlikely(intr & CPT_VF_INTR_NWRP_MASK)) {
+		cptvf_clear_nwrp_intr(cptvf);
+		dev_err(&pdev->dev, "NCB response write error interrupt 0x%llx on CPT VF %d\n",
+			intr, cptvf->vfid);
+	} else if (unlikely(intr & CPT_VF_INTR_SERR_MASK)) {
+		cptvf_clear_swerr_intr(cptvf);
+		dev_err(&pdev->dev, "Software error interrupt 0x%llx on CPT VF %d\n",
+			intr, cptvf->vfid);
+	} else {
+		dev_err(&pdev->dev, "Unhandled interrupt in CPT VF %d\n",
+			cptvf->vfid);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static inline struct cptvf_wqe *get_cptvf_vq_wqe(struct cpt_vf *cptvf,
+						 int qno)
+{
+	struct cptvf_wqe_info *nwqe_info;
+
+	if (unlikely(qno >= cptvf->nr_queues))
+		return NULL;
+	nwqe_info = (struct cptvf_wqe_info *)cptvf->wqe_info;
+
+	return &nwqe_info->vq_wqe[qno];
+}
+
+static inline u32 cptvf_read_vq_done_count(struct cpt_vf *cptvf)
+{
+	union cptx_vqx_done vqx_done;
+
+	vqx_done.u = cpt_read_csr64(cptvf->reg_base, CPTX_VQX_DONE(0, 0));
+	return vqx_done.s.done;
+}
+
+static inline void cptvf_write_vq_done_ack(struct cpt_vf *cptvf,
+					   u32 ackcnt)
+{
+	union cptx_vqx_done_ack vqx_dack_cnt;
+
+	vqx_dack_cnt.u = cpt_read_csr64(cptvf->reg_base,
+					CPTX_VQX_DONE_ACK(0, 0));
+	vqx_dack_cnt.s.done_ack = ackcnt;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_DONE_ACK(0, 0),
+			vqx_dack_cnt.u);
+}
+
+static irqreturn_t cptvf_done_intr_handler(int irq, void *cptvf_irq)
+{
+	struct cpt_vf *cptvf = (struct cpt_vf *)cptvf_irq;
+	struct pci_dev *pdev = cptvf->pdev;
+	/* Read the number of completions */
+	u32 intr = cptvf_read_vq_done_count(cptvf);
+
+	if (intr) {
+		struct cptvf_wqe *wqe;
+
+		/* Acknowledge the number of
+		 * scheduled completions for processing
+		 */
+		cptvf_write_vq_done_ack(cptvf, intr);
+		wqe = get_cptvf_vq_wqe(cptvf, 0);
+		if (unlikely(!wqe)) {
+			dev_err(&pdev->dev, "No work to schedule for VF (%d)",
+				cptvf->vfid);
+			return IRQ_NONE;
+		}
+		tasklet_hi_schedule(&wqe->twork);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int cptvf_register_misc_intr(struct cpt_vf *cptvf)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	int ret;
+
+	/* Register misc interrupt handlers */
+	ret = request_irq(cptvf->msix_entries[CPT_VF_INT_VEC_E_MISC].vector,
+			  cptvf_misc_intr_handler, 0, "CPT VF misc intr",
+			  cptvf);
+	if (ret)
+		goto fail;
+
+	cptvf->irq_allocated[CPT_VF_INT_VEC_E_MISC] = true;
+
+	/* Enable mailbox interrupt */
+	cptvf_enable_mbox_interrupts(cptvf);
+	cptvf_enable_swerr_interrupts(cptvf);
+
+	return 0;
+
+fail:
+	dev_err(&pdev->dev, "Request misc irq failed");
+	cptvf_free_all_interrupts(cptvf);
+	return ret;
+}
+
+static int cptvf_register_done_intr(struct cpt_vf *cptvf)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	int ret;
+
+	/* Register DONE interrupt handlers */
+	ret = request_irq(cptvf->msix_entries[CPT_VF_INT_VEC_E_DONE].vector,
+			  cptvf_done_intr_handler, 0, "CPT VF done intr",
+			  cptvf);
+	if (ret)
+		goto fail;
+
+	cptvf->irq_allocated[CPT_VF_INT_VEC_E_DONE] = true;
+
+	/* Enable mailbox interrupt */
+	cptvf_enable_done_interrupts(cptvf);
+	return 0;
+
+fail:
+	dev_err(&pdev->dev, "Request done irq failed\n");
+	cptvf_free_all_interrupts(cptvf);
+	return ret;
+}
+
+static void cptvf_unregister_interrupts(struct cpt_vf *cptvf)
+{
+	cptvf_free_all_interrupts(cptvf);
+	cptvf_disable_msix(cptvf);
+}
+
+static void cptvf_set_irq_affinity(struct cpt_vf *cptvf)
+{
+	struct pci_dev *pdev = cptvf->pdev;
+	int vec, cpu;
+	int irqnum;
+
+	for (vec = 0; vec < CPT_VF_MSIX_VECTORS; vec++) {
+		if (!cptvf->irq_allocated[vec])
+			continue;
+
+		if (!zalloc_cpumask_var(&cptvf->affinity_mask[vec],
+					GFP_KERNEL)) {
+			dev_err(&pdev->dev, "Allocation failed for affinity_mask for VF %d",
+				cptvf->vfid);
+			return;
+		}
+
+		cpu = cptvf->vfid % num_online_cpus();
+		cpumask_set_cpu(cpumask_local_spread(cpu, cptvf->node),
+				cptvf->affinity_mask[vec]);
+		irqnum = cptvf->msix_entries[vec].vector;
+		irq_set_affinity_hint(irqnum, cptvf->affinity_mask[vec]);
+	}
+}
+
+static void cptvf_write_vq_saddr(struct cpt_vf *cptvf, u64 val)
+{
+	union cptx_vqx_saddr vqx_saddr;
+
+	vqx_saddr.u = val;
+	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_SADDR(0, 0), vqx_saddr.u);
+}
+
+void cptvf_device_init(struct cpt_vf *cptvf)
+{
+	u64 base_addr = 0;
+
+	/* Disable the VQ */
+	cptvf_write_vq_ctl(cptvf, 0);
+	/* Reset the doorbell */
+	cptvf_write_vq_doorbell(cptvf, 0);
+	/* Clear inflight */
+	cptvf_write_vq_inprog(cptvf, 0);
+	/* Write VQ SADDR */
+	/* TODO: for now only one queue, so hard coded */
+	base_addr = (u64)(cptvf->cqinfo.queue[0].qhead->dma_addr);
+	cptvf_write_vq_saddr(cptvf, base_addr);
+	/* Configure timerhold / coalescence */
+	cptvf_write_vq_done_timewait(cptvf, CPT_TIMER_THOLD);
+	cptvf_write_vq_done_numwait(cptvf, 1);
+	/* Enable the VQ */
+	cptvf_write_vq_ctl(cptvf, 1);
+	/* Flag the VF ready */
+	cptvf->flags |= CPT_FLAG_DEVICE_READY;
+}
+
+static int cptvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct device *dev = &pdev->dev;
+	struct cpt_vf *cptvf;
+	int    err;
+
+	cptvf = devm_kzalloc(dev, sizeof(*cptvf), GFP_KERNEL);
+	if (!cptvf)
+		return -ENOMEM;
+
+	pci_set_drvdata(pdev, cptvf);
+	cptvf->pdev = pdev;
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(dev, "Failed to enable PCI device\n");
+		pci_set_drvdata(pdev, NULL);
+		return err;
+	}
+
+	err = pci_request_regions(pdev, DRV_NAME);
+	if (err) {
+		dev_err(dev, "PCI request regions failed 0x%x\n", err);
+		goto cptvf_err_disable_device;
+	}
+	/* Mark as VF driver */
+	cptvf->flags |= CPT_FLAG_VF_DRIVER;
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(48));
+	if (err) {
+		dev_err(dev, "Unable to get usable DMA configuration\n");
+		goto cptvf_err_release_regions;
+	}
+
+	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(48));
+	if (err) {
+		dev_err(dev, "Unable to get 48-bit DMA for consistent allocations\n");
+		goto cptvf_err_release_regions;
+	}
+
+	/* MAP PF's configuration registers */
+	cptvf->reg_base = pcim_iomap(pdev, 0, 0);
+	if (!cptvf->reg_base) {
+		dev_err(dev, "Cannot map config register space, aborting\n");
+		err = -ENOMEM;
+		goto cptvf_err_release_regions;
+	}
+
+	cptvf->node = dev_to_node(&pdev->dev);
+	/* Enable MSI-X */
+	err = cptvf_enable_msix(cptvf);
+	if (err) {
+		dev_err(dev, "cptvf_enable_msix() failed");
+		goto cptvf_err_release_regions;
+	}
+
+	/* Register mailbox interrupts */
+	cptvf_register_misc_intr(cptvf);
+
+	/* Check ready with PF */
+	/* Gets chip ID / device Id from PF if ready */
+	err = cptvf_check_pf_ready(cptvf);
+	if (err) {
+		dev_err(dev, "PF not responding to READY msg");
+		goto cptvf_err_release_regions;
+	}
+
+	/* CPT VF software resources initialization */
+	cptvf->cqinfo.qchunksize = CPT_CMD_QCHUNK_SIZE;
+	err = cptvf_sw_init(cptvf, CPT_CMD_QLEN, CPT_NUM_QS_PER_VF);
+	if (err) {
+		dev_err(dev, "cptvf_sw_init() failed");
+		goto cptvf_err_release_regions;
+	}
+	/* Convey VQ LEN to PF */
+	err = cptvf_send_vq_size_msg(cptvf);
+	if (err) {
+		dev_err(dev, "PF not responding to QLEN msg");
+		goto cptvf_err_release_regions;
+	}
+
+	/* CPT VF device initialization */
+	cptvf_device_init(cptvf);
+	/* Send msg to PF to assign currnet Q to required group */
+	cptvf->vfgrp = 1;
+	err = cptvf_send_vf_to_grp_msg(cptvf);
+	if (err) {
+		dev_err(dev, "PF not responding to VF_GRP msg");
+		goto cptvf_err_release_regions;
+	}
+
+	cptvf->priority = 1;
+	err = cptvf_send_vf_priority_msg(cptvf);
+	if (err) {
+		dev_err(dev, "PF not responding to VF_PRIO msg");
+		goto cptvf_err_release_regions;
+	}
+	/* Register DONE interrupts */
+	err = cptvf_register_done_intr(cptvf);
+	if (err)
+		goto cptvf_err_release_regions;
+
+	/* Set irq affinity masks */
+	cptvf_set_irq_affinity(cptvf);
+	/* Convey UP to PF */
+	err = cptvf_send_vf_up(cptvf);
+	if (err) {
+		dev_err(dev, "PF not responding to UP msg");
+		goto cptvf_up_fail;
+	}
+	err = cvm_crypto_init(cptvf);
+	if (err) {
+		dev_err(dev, "Algorithm register failed\n");
+		goto cptvf_up_fail;
+	}
+	return 0;
+
+cptvf_up_fail:
+	cptvf_unregister_interrupts(cptvf);
+cptvf_err_release_regions:
+	pci_release_regions(pdev);
+cptvf_err_disable_device:
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+
+	return err;
+}
+
+static void cptvf_remove(struct pci_dev *pdev)
+{
+	struct cpt_vf *cptvf = pci_get_drvdata(pdev);
+
+	if (!cptvf)
+		dev_err(&pdev->dev, "Invalid CPT-VF device\n");
+
+	/* Convey DOWN to PF */
+	if (cptvf_send_vf_down(cptvf)) {
+		dev_err(&pdev->dev, "PF not responding to DOWN msg");
+	} else {
+		cptvf_unregister_interrupts(cptvf);
+		cptvf_sw_cleanup(cptvf);
+		pci_set_drvdata(pdev, NULL);
+		pci_release_regions(pdev);
+		pci_disable_device(pdev);
+		cvm_crypto_exit();
+	}
+}
+
+static void cptvf_shutdown(struct pci_dev *pdev)
+{
+	cptvf_remove(pdev);
+}
+
+/* Supported devices */
+static const struct pci_device_id cptvf_id_table[] = {
+	{PCI_VDEVICE(CAVIUM, CPT_81XX_PCI_VF_DEVICE_ID), 0},
+	{ 0, }  /* end of table */
+};
+
+static struct pci_driver cptvf_pci_driver = {
+	.name = DRV_NAME,
+	.id_table = cptvf_id_table,
+	.probe = cptvf_probe,
+	.remove = cptvf_remove,
+	.shutdown = cptvf_shutdown,
+};
+
+module_pci_driver(cptvf_pci_driver);
+
+MODULE_AUTHOR("George Cherian <george.cherian@cavium.com>");
+MODULE_DESCRIPTION("Cavium Thunder CPT Virtual Function Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DEVICE_TABLE(pci, cptvf_id_table);