Re: [PATCH v5 2/3] drivers: crypto: Add the Virtual Function driver for CPT
From: Sasha Levin
Date: Thu Feb 02 2017 - 13:55:07 EST
On Mon, Jan 30, 2017 at 7:30 AM, George Cherian
<george.cherian@xxxxxxxxxx> wrote:
> diff --git a/drivers/crypto/cavium/cpt/cptvf_main.c b/drivers/crypto/cavium/cpt/cptvf_main.c
> new file mode 100644
> index 0000000..4cf466d
> --- /dev/null
> +++ b/drivers/crypto/cavium/cpt/cptvf_main.c
> @@ -0,0 +1,948 @@
> +/*
> + * 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, j;
> + struct command_queue *queue = NULL;
> + struct command_chunk *chunk = NULL, *next = 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(node, &cqinfo->queue[i].chead) {
> + chunk = hlist_entry(node, struct command_chunk,
> + nextchunk);
> + break;
> + }
What exactly is the purpose of that loop?
> + for (j = 0; j < queue->nchunks; j++) {
> + if (j < queue->nchunks) {
We already know that "j < queue->nchunks" at this point...
> + node = node->next;
> + next = hlist_entry(node, struct command_chunk,
> + 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);
> + chunk = next;
> + }
> + queue->nchunks = 0;
> + queue->idx = 0;
> + }
This whole function looks like an attempt to open code
hlist_for_each_entry_safe(), why didn't you just use that?
> +
> + /* 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;
> + last->nextchunk.next = &curr->nextchunk;
You shouldn't access the hlist struct members directly, use helper
functions here.
> + 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@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("Cavium Thunder CPT Virtual Function Driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_VERSION(DRV_VERSION);
> +MODULE_DEVICE_TABLE(pci, cptvf_id_table);
> diff --git a/drivers/crypto/cavium/cpt/cptvf_mbox.c b/drivers/crypto/cavium/cpt/cptvf_mbox.c
> new file mode 100644
> index 0000000..d5ec3b8
> --- /dev/null
> +++ b/drivers/crypto/cavium/cpt/cptvf_mbox.c
> @@ -0,0 +1,211 @@
> +/*
> + * 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 "cptvf.h"
> +
> +static void cptvf_send_msg_to_pf(struct cpt_vf *cptvf, struct cpt_mbox *mbx)
> +{
> + /* Writing mbox(1) causes interrupt */
> + cpt_write_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 0),
> + mbx->msg);
> + cpt_write_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 1),
> + mbx->data);
> +}
> +
> +/* ACKs PF's mailbox message
> + */
> +void cptvf_mbox_send_ack(struct cpt_vf *cptvf, struct cpt_mbox *mbx)
> +{
> + mbx->msg = CPT_MBOX_MSG_TYPE_ACK;
> + cptvf_send_msg_to_pf(cptvf, mbx);
> +}
> +
> +/* NACKs PF's mailbox message that VF is not able to
> + * complete the action
> + */
> +void cptvf_mbox_send_nack(struct cpt_vf *cptvf, struct cpt_mbox *mbx)
> +{
> + mbx->msg = CPT_MBOX_MSG_TYPE_NACK;
> + cptvf_send_msg_to_pf(cptvf, mbx);
> +}
> +
> +/* Interrupt handler to handle mailbox messages from VFs */
> +void cptvf_handle_mbox_intr(struct cpt_vf *cptvf)
> +{
> + struct cpt_mbox mbx = {};
> +
> + /*
> + * MBOX[0] contains msg
> + * MBOX[1] contains data
> + */
> + mbx.msg = cpt_read_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 0));
> + mbx.data = cpt_read_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 1));
> + dev_dbg(&cptvf->pdev->dev, "%s: Mailbox msg 0x%llx from PF\n",
> + __func__, mbx.msg);
> + switch (mbx.msg) {
> + case CPT_MSG_READY:
> + {
> + cptvf->pf_acked = true;
> + cptvf->vfid = mbx.data;
> + dev_dbg(&cptvf->pdev->dev, "Received VFID %d\n", cptvf->vfid);
> + break;
> + }
> + case CPT_MSG_QBIND_GRP:
> + cptvf->pf_acked = true;
> + cptvf->vftype = mbx.data;
> + dev_dbg(&cptvf->pdev->dev, "VF %d type %s group %d\n",
> + cptvf->vfid, ((mbx.data == SE_TYPES) ? "SE" : "AE"),
> + cptvf->vfgrp);
> + break;
> + case CPT_MBOX_MSG_TYPE_ACK:
> + cptvf->pf_acked = true;
> + break;
> + case CPT_MBOX_MSG_TYPE_NACK:
> + cptvf->pf_nacked = true;
> + break;
> + default:
> + dev_err(&cptvf->pdev->dev, "Invalid msg from PF, msg 0x%llx\n",
> + mbx.msg);
> + break;
> + }
> +}
> +
> +static int cptvf_send_msg_to_pf_timeout(struct cpt_vf *cptvf,
> + struct cpt_mbox *mbx)
> +{
> + int timeout = CPT_MBOX_MSG_TIMEOUT;
> + int sleep = 10;
> +
> + cptvf->pf_acked = false;
> + cptvf->pf_nacked = false;
> + cptvf_send_msg_to_pf(cptvf, mbx);
> + /* Wait for previous message to be acked, timeout 2sec */
> + while (!cptvf->pf_acked) {
> + if (cptvf->pf_nacked)
> + return -EINVAL;
> + msleep(sleep);
> + if (cptvf->pf_acked)
> + break;
> + timeout -= sleep;
> + if (!timeout) {
> + dev_err(&cptvf->pdev->dev, "PF didn't ack to mbox msg %llx from VF%u\n",
> + (mbx->msg & 0xFF), cptvf->vfid);
> + return -EBUSY;
> + }
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Checks if VF is able to comminicate with PF
> + * and also gets the CPT number this VF is associated to.
> + */
> +int cptvf_check_pf_ready(struct cpt_vf *cptvf)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct cpt_mbox mbx = {};
> +
> + mbx.msg = CPT_MSG_READY;
> + if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
> + dev_err(&pdev->dev, "PF didn't respond to READY msg\n");
> + return -EBUSY;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Communicate VQs size to PF to program CPT(0)_PF_Q(0-15)_CTL of the VF.
> + * Must be ACKed.
> + */
> +int cptvf_send_vq_size_msg(struct cpt_vf *cptvf)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct cpt_mbox mbx = {};
> +
> + mbx.msg = CPT_MSG_QLEN;
> + mbx.data = cptvf->qsize;
> + if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
> + dev_err(&pdev->dev, "PF didn't respond to vq_size msg\n");
> + return -EBUSY;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Communicate VF group required to PF and get the VQ binded to that group
> + */
> +int cptvf_send_vf_to_grp_msg(struct cpt_vf *cptvf)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct cpt_mbox mbx = {};
> +
> + mbx.msg = CPT_MSG_QBIND_GRP;
> + /* Convey group of the VF */
> + mbx.data = cptvf->vfgrp;
> + if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
> + dev_err(&pdev->dev, "PF didn't respond to vf_type msg\n");
> + return -EBUSY;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Communicate VF group required to PF and get the VQ binded to that group
> + */
> +int cptvf_send_vf_priority_msg(struct cpt_vf *cptvf)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct cpt_mbox mbx = {};
> +
> + mbx.msg = CPT_MSG_VQ_PRIORITY;
> + /* Convey group of the VF */
> + mbx.data = cptvf->priority;
> + if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
> + dev_err(&pdev->dev, "PF didn't respond to vf_type msg\n");
> + return -EBUSY;
> + }
> + return 0;
> +}
> +
> +/*
> + * Communicate to PF that VF is UP and running
> + */
> +int cptvf_send_vf_up(struct cpt_vf *cptvf)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct cpt_mbox mbx = {};
> +
> + mbx.msg = CPT_MSG_VF_UP;
> + if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
> + dev_err(&pdev->dev, "PF didn't respond to UP msg\n");
> + return -EBUSY;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Communicate to PF that VF is DOWN and running
> + */
> +int cptvf_send_vf_down(struct cpt_vf *cptvf)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct cpt_mbox mbx = {};
> +
> + mbx.msg = CPT_MSG_VF_DOWN;
> + if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
> + dev_err(&pdev->dev, "PF didn't respond to DOWN msg\n");
> + return -EBUSY;
> + }
> +
> + return 0;
> +}
> diff --git a/drivers/crypto/cavium/cpt/cptvf_reqmanager.c b/drivers/crypto/cavium/cpt/cptvf_reqmanager.c
> new file mode 100644
> index 0000000..062b8e9
> --- /dev/null
> +++ b/drivers/crypto/cavium/cpt/cptvf_reqmanager.c
> @@ -0,0 +1,593 @@
> +/*
> + * 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 "cptvf.h"
> +#include "request_manager.h"
> +
> +/**
> + * get_free_pending_entry - get free entry from pending queue
> + * @param pqinfo: pending_qinfo structure
> + * @param qno: queue number
> + */
> +static struct pending_entry *get_free_pending_entry(struct pending_queue *q,
> + int qlen)
> +{
> + struct pending_entry *ent = NULL;
> +
> + ent = &q->head[q->rear];
> + if (unlikely(ent->busy)) {
> + ent = NULL;
> + goto no_free_entry;
> + }
> +
> + q->rear++;
> + if (unlikely(q->rear == qlen))
> + q->rear = 0;
> +
> +no_free_entry:
> + return ent;
> +}
> +
> +static inline void pending_queue_inc_front(struct pending_qinfo *pqinfo,
> + int qno)
> +{
> + struct pending_queue *queue = &pqinfo->queue[qno];
> +
> + queue->front++;
> + if (unlikely(queue->front == pqinfo->qlen))
> + queue->front = 0;
> +}
> +
> +static int setup_sgio_components(struct cpt_vf *cptvf, struct buf_ptr *list,
> + int buf_count, u8 *buffer)
> +{
> + int ret = 0, i, j;
> + int components;
> + struct sglist_component *sg_ptr = NULL;
> + struct pci_dev *pdev = cptvf->pdev;
> +
> + if (unlikely(!list)) {
> + dev_err(&pdev->dev, "Input List pointer is NULL\n");
> + return -EFAULT;
> + }
> +
> + for (i = 0; i < buf_count; i++) {
> + if (likely(list[i].vptr)) {
> + list[i].dma_addr = dma_map_single(&pdev->dev,
> + list[i].vptr,
> + list[i].size,
> + DMA_BIDIRECTIONAL);
> + if (unlikely(dma_mapping_error(&pdev->dev,
> + list[i].dma_addr))) {
> + dev_err(&pdev->dev, "DMA map kernel buffer failed for component: %d\n",
> + i);
> + ret = -EIO;
> + goto sg_cleanup;
> + }
> + }
> + }
> +
> + components = buf_count / 4;
> + sg_ptr = (struct sglist_component *)buffer;
> + for (i = 0; i < components; i++) {
> + sg_ptr->u.s.len0 = cpu_to_be16(list[i * 4 + 0].size);
> + sg_ptr->u.s.len1 = cpu_to_be16(list[i * 4 + 1].size);
> + sg_ptr->u.s.len2 = cpu_to_be16(list[i * 4 + 2].size);
> + sg_ptr->u.s.len3 = cpu_to_be16(list[i * 4 + 3].size);
> + sg_ptr->ptr0 = cpu_to_be64(list[i * 4 + 0].dma_addr);
> + sg_ptr->ptr1 = cpu_to_be64(list[i * 4 + 1].dma_addr);
> + sg_ptr->ptr2 = cpu_to_be64(list[i * 4 + 2].dma_addr);
> + sg_ptr->ptr3 = cpu_to_be64(list[i * 4 + 3].dma_addr);
> + sg_ptr++;
> + }
> +
> + components = buf_count % 4;
> +
> + switch (components) {
> + case 3:
> + sg_ptr->u.s.len2 = cpu_to_be16(list[i * 4 + 2].size);
> + sg_ptr->ptr2 = cpu_to_be64(list[i * 4 + 2].dma_addr);
> + /* Fall through */
> + case 2:
> + sg_ptr->u.s.len1 = cpu_to_be16(list[i * 4 + 1].size);
> + sg_ptr->ptr1 = cpu_to_be64(list[i * 4 + 1].dma_addr);
> + /* Fall through */
> + case 1:
> + sg_ptr->u.s.len0 = cpu_to_be16(list[i * 4 + 0].size);
> + sg_ptr->ptr0 = cpu_to_be64(list[i * 4 + 0].dma_addr);
> + break;
> + default:
> + break;
> + }
> +
> + return ret;
> +
> +sg_cleanup:
> + for (j = 0; j < i; j++) {
> + if (list[j].dma_addr) {
> + dma_unmap_single(&pdev->dev, list[i].dma_addr,
> + list[i].size, DMA_BIDIRECTIONAL);
> + }
> +
> + list[j].dma_addr = 0;
> + }
> +
> + return ret;
> +}
> +
> +static inline int setup_sgio_list(struct cpt_vf *cptvf,
> + struct cpt_info_buffer *info,
> + struct cpt_request_info *req)
> +{
> + u16 g_sz_bytes = 0, s_sz_bytes = 0;
> + int ret = 0;
> + struct pci_dev *pdev = cptvf->pdev;
> +
> + if (req->incnt > MAX_SG_IN_CNT || req->outcnt > MAX_SG_OUT_CNT) {
> + dev_err(&pdev->dev, "Request SG components are higher than supported\n");
> + ret = -EINVAL;
> + goto scatter_gather_clean;
> + }
> +
> + /* Setup gather (input) components */
> + g_sz_bytes = ((req->incnt + 3) / 4) * sizeof(struct sglist_component);
> + info->gather_components = kzalloc(g_sz_bytes, GFP_KERNEL);
> + if (!info->gather_components) {
> + ret = -ENOMEM;
> + goto scatter_gather_clean;
> + }
> +
> + ret = setup_sgio_components(cptvf, req->in,
> + req->incnt,
> + info->gather_components);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to setup gather list\n");
> + ret = -EFAULT;
> + goto scatter_gather_clean;
> + }
> +
> + /* Setup scatter (output) components */
> + s_sz_bytes = ((req->outcnt + 3) / 4) * sizeof(struct sglist_component);
> + info->scatter_components = kzalloc(s_sz_bytes, GFP_KERNEL);
> + if (!info->scatter_components) {
> + ret = -ENOMEM;
> + goto scatter_gather_clean;
> + }
> +
> + ret = setup_sgio_components(cptvf, req->out,
> + req->outcnt,
> + info->scatter_components);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to setup gather list\n");
> + ret = -EFAULT;
> + goto scatter_gather_clean;
> + }
> +
> + /* Create and initialize DPTR */
> + info->dlen = g_sz_bytes + s_sz_bytes + SG_LIST_HDR_SIZE;
> + info->in_buffer = kzalloc(info->dlen, GFP_KERNEL);
> + if (!info->in_buffer) {
> + ret = -ENOMEM;
> + goto scatter_gather_clean;
> + }
> +
> + ((u16 *)info->in_buffer)[0] = req->outcnt;
> + ((u16 *)info->in_buffer)[1] = req->incnt;
> + ((u16 *)info->in_buffer)[2] = 0;
> + ((u16 *)info->in_buffer)[3] = 0;
> + *(u64 *)info->in_buffer = cpu_to_be64p((u64 *)info->in_buffer);
> +
> + memcpy(&info->in_buffer[8], info->gather_components,
> + g_sz_bytes);
> + memcpy(&info->in_buffer[8 + g_sz_bytes],
> + info->scatter_components, s_sz_bytes);
> +
> + info->dptr_baddr = dma_map_single(&pdev->dev,
> + (void *)info->in_buffer,
> + info->dlen,
> + DMA_BIDIRECTIONAL);
> + if (dma_mapping_error(&pdev->dev, info->dptr_baddr)) {
> + dev_err(&pdev->dev, "Mapping DPTR Failed %d\n", info->dlen);
> + ret = -EIO;
> + goto scatter_gather_clean;
> + }
> +
> + /* Create and initialize RPTR */
> + info->out_buffer = kzalloc(COMPLETION_CODE_SIZE, GFP_KERNEL);
> + if (!info->out_buffer) {
> + ret = -ENOMEM;
> + goto scatter_gather_clean;
> + }
> +
> + *((u64 *)info->out_buffer) = ~((u64)COMPLETION_CODE_INIT);
> + info->alternate_caddr = (u64 *)info->out_buffer;
> + info->rptr_baddr = dma_map_single(&pdev->dev,
> + (void *)info->out_buffer,
> + COMPLETION_CODE_SIZE,
> + DMA_BIDIRECTIONAL);
> + if (dma_mapping_error(&pdev->dev, info->rptr_baddr)) {
> + dev_err(&pdev->dev, "Mapping RPTR Failed %d\n",
> + COMPLETION_CODE_SIZE);
> + ret = -EIO;
> + goto scatter_gather_clean;
> + }
> +
> + return 0;
> +
> +scatter_gather_clean:
> + return ret;
> +}
> +
> +int send_cpt_command(struct cpt_vf *cptvf, union cpt_inst_s *cmd,
> + u32 qno)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct command_qinfo *qinfo = NULL;
> + struct command_queue *queue;
> + struct command_chunk *chunk;
> + u8 *ent;
> + int ret = 0;
> +
> + if (unlikely(qno >= cptvf->nr_queues)) {
> + dev_err(&pdev->dev, "Invalid queue (qno: %d, nr_queues: %d)\n",
> + qno, cptvf->nr_queues);
> + return -EINVAL;
> + }
> +
> + qinfo = &cptvf->cqinfo;
> + queue = &qinfo->queue[qno];
> + /* lock commad queue */
> + spin_lock(&queue->lock);
> + ent = &queue->qhead->head[queue->idx * qinfo->cmd_size];
> + memcpy(ent, (void *)cmd, qinfo->cmd_size);
> +
> + if (++queue->idx >= queue->qhead->size / 64) {
> + struct hlist_node *node;
> +
> + hlist_for_each(node, &queue->chead) {
> + chunk = hlist_entry(node, struct command_chunk,
> + nextchunk);
> + if (chunk == queue->qhead) {
> + continue;
> + } else {
> + queue->qhead = chunk;
> + break;
> + }
> + }
> + queue->idx = 0;
> + }
> + /* make sure all memory stores are done before ringing doorbell */
> + smp_wmb();
> + cptvf_write_vq_doorbell(cptvf, 1);
> + /* unlock command queue */
> + spin_unlock(&queue->lock);
> +
> + return ret;
> +}
> +
> +void do_request_cleanup(struct cpt_vf *cptvf,
> + struct cpt_info_buffer *info)
> +{
> + int i;
> + struct pci_dev *pdev = cptvf->pdev;
> + struct cpt_request_info *req;
> +
> + if (info->dptr_baddr)
> + dma_unmap_single(&pdev->dev, info->dptr_baddr,
> + info->dlen, DMA_BIDIRECTIONAL);
> +
> + if (info->rptr_baddr)
> + dma_unmap_single(&pdev->dev, info->rptr_baddr,
> + COMPLETION_CODE_SIZE, DMA_BIDIRECTIONAL);
> +
> + if (info->comp_baddr)
> + dma_unmap_single(&pdev->dev, info->comp_baddr,
> + sizeof(union cpt_res_s), DMA_BIDIRECTIONAL);
> +
> + if (info->req) {
> + req = info->req;
> + for (i = 0; i < req->outcnt; i++) {
> + if (req->out[i].dma_addr)
> + dma_unmap_single(&pdev->dev,
> + req->out[i].dma_addr,
> + req->out[i].size,
> + DMA_BIDIRECTIONAL);
> + }
> +
> + for (i = 0; i < req->incnt; i++) {
> + if (req->in[i].dma_addr)
> + dma_unmap_single(&pdev->dev,
> + req->in[i].dma_addr,
> + req->in[i].size,
> + DMA_BIDIRECTIONAL);
> + }
> + }
> +
> + if (info->scatter_components)
> + kzfree(info->scatter_components);
> +
> + if (info->gather_components)
> + kzfree(info->gather_components);
> +
> + if (info->out_buffer)
> + kzfree(info->out_buffer);
> +
> + if (info->in_buffer)
> + kzfree(info->in_buffer);
> +
> + if (info->completion_addr)
> + kzfree((void *)info->completion_addr);
> +
> + kzfree(info);
> +}
> +
> +void do_post_process(struct cpt_vf *cptvf, struct cpt_info_buffer *info)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> +
> + if (!info || !cptvf) {
> + dev_err(&pdev->dev, "Input params are incorrect for post processing\n");
> + return;
> + }
> +
> + do_request_cleanup(cptvf, info);
> +}
> +
> +static inline void process_pending_queue(struct cpt_vf *cptvf,
> + struct pending_qinfo *pqinfo,
> + int qno)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> + struct pending_queue *pqueue = &pqinfo->queue[qno];
> + struct pending_entry *pentry = NULL;
> + struct cpt_info_buffer *info = NULL;
> + union cpt_res_s *status = NULL;
> + unsigned char ccode;
> +
> + while (1) {
> + spin_lock_bh(&pqueue->lock);
> + pentry = &pqueue->head[pqueue->front];
> + if (unlikely(!pentry->busy)) {
> + spin_unlock_bh(&pqueue->lock);
> + break;
> + }
> +
> + info = (struct cpt_info_buffer *)pentry->post_arg;
> + if (unlikely(!info)) {
> + dev_err(&pdev->dev, "Pending Entry post arg NULL\n");
> + pending_queue_inc_front(pqinfo, qno);
> + spin_unlock_bh(&pqueue->lock);
> + continue;
> + }
> +
> + status = (union cpt_res_s *)pentry->completion_addr;
> + ccode = status->s.compcode;
> + if ((status->s.compcode == CPT_COMP_E_FAULT) ||
> + (status->s.compcode == CPT_COMP_E_SWERR)) {
> + dev_err(&pdev->dev, "Request failed with %s\n",
> + (status->s.compcode == CPT_COMP_E_FAULT) ?
> + "DMA Fault" : "Software error");
> + pentry->completion_addr = NULL;
> + pentry->busy = false;
> + atomic64_dec((&pqueue->pending_count));
> + pentry->post_arg = NULL;
> + pending_queue_inc_front(pqinfo, qno);
> + do_request_cleanup(cptvf, info);
> + spin_unlock_bh(&pqueue->lock);
> + break;
> + } else if (status->s.compcode == COMPLETION_CODE_INIT) {
> + /* check for timeout */
> + if (time_after_eq(jiffies,
> + (info->time_in +
> + (CPT_COMMAND_TIMEOUT * HZ)))) {
> + dev_err(&pdev->dev, "Request timed out");
> + pentry->completion_addr = NULL;
> + pentry->busy = false;
> + atomic64_dec((&pqueue->pending_count));
> + pentry->post_arg = NULL;
> + pending_queue_inc_front(pqinfo, qno);
> + do_request_cleanup(cptvf, info);
> + spin_unlock_bh(&pqueue->lock);
> + break;
> + } else if ((*info->alternate_caddr ==
> + (~COMPLETION_CODE_INIT)) &&
> + (info->extra_time < TIME_IN_RESET_COUNT)) {
> + info->time_in = jiffies;
> + info->extra_time++;
> + spin_unlock_bh(&pqueue->lock);
> + break;
> + }
> + }
> +
> + pentry->completion_addr = NULL;
> + pentry->busy = false;
> + pentry->post_arg = NULL;
> + atomic64_dec((&pqueue->pending_count));
> + pending_queue_inc_front(pqinfo, qno);
> + spin_unlock_bh(&pqueue->lock);
> +
> + do_post_process(info->cptvf, info);
> + /*
> + * Calling callback after we find
> + * that the request has been serviced
> + */
> + pentry->callback(ccode, pentry->callback_arg);
> + }
> +}
> +
> +int process_request(struct cpt_vf *cptvf, struct cpt_request_info *req)
> +{
> + int ret = 0, clear = 0, queue = 0;
> + struct cpt_info_buffer *info = NULL;
> + struct cptvf_request *cpt_req = NULL;
> + union ctrl_info *ctrl = NULL;
> + struct pending_entry *pentry = NULL;
> + struct pending_queue *pqueue = NULL;
> + struct pci_dev *pdev = cptvf->pdev;
> + u8 group = 0;
> + struct cpt_vq_command vq_cmd;
> + union cpt_inst_s cptinst;
> +
> + if (unlikely(!cptvf || !req)) {
You already dereferenced cptvf above.
> + dev_err(&pdev->dev, "Invalid inputs (cptvf: %p, req: %p)\n",
> + cptvf, req);
> + return -EINVAL;
> + }
> +
> + info = kzalloc(sizeof(*info), GFP_KERNEL | GFP_ATOMIC);
What do you expect to happen with GFP_KERNEL | GFP_ATOMIC?
> + if (unlikely(!info)) {
> + dev_err(&pdev->dev, "Unable to allocate memory for info_buffer\n");
> + return -ENOMEM;
> + }
> +
> + cpt_req = (struct cptvf_request *)&req->req;
> + ctrl = (union ctrl_info *)&req->ctrl;
> +
> + info->cptvf = cptvf;
> + group = ctrl->s.grp;
> + ret = setup_sgio_list(cptvf, info, req);
> + if (ret) {
> + dev_err(&pdev->dev, "Setting up SG list failed");
> + goto request_cleanup;
> + }
> +
> + cpt_req->dlen = info->dlen;
> + /*
> + * Get buffer for union cpt_res_s response
> + * structure and its physical address
> + */
> + info->completion_addr = kzalloc(sizeof(union cpt_res_s),
> + GFP_KERNEL | GFP_ATOMIC);
Same as above, you also never checked if it had failed.
> + *((u8 *)(info->completion_addr)) = COMPLETION_CODE_INIT;
Supposedly info->completion_addr is a "union cpt_res_s", why do you
cast it to u8 ptr?
> + info->comp_baddr = dma_map_single(&pdev->dev,
> + (void *)info->completion_addr,
> + sizeof(union cpt_res_s),
> + DMA_BIDIRECTIONAL);
> + if (dma_mapping_error(&pdev->dev, info->comp_baddr)) {
> + dev_err(&pdev->dev, "mapping compptr Failed %lu\n",
> + sizeof(union cpt_res_s));
> + ret = -EFAULT;
> + goto request_cleanup;
> + }
> +
> + /* Fill the VQ command */
> + vq_cmd.cmd.u64 = 0;
> + vq_cmd.cmd.s.opcode = cpu_to_be16(cpt_req->opcode.flags);
> + vq_cmd.cmd.s.param1 = cpu_to_be16(cpt_req->param1);
> + vq_cmd.cmd.s.param2 = cpu_to_be16(cpt_req->param2);
> + vq_cmd.cmd.s.dlen = cpu_to_be16(cpt_req->dlen);
> +
> + /* 64-bit swap for microcode data reads, not needed for addresses*/
> + vq_cmd.cmd.u64 = cpu_to_be64(vq_cmd.cmd.u64);
> + vq_cmd.dptr = info->dptr_baddr;
> + vq_cmd.rptr = info->rptr_baddr;
> + vq_cmd.cptr.u64 = 0;
> + vq_cmd.cptr.s.grp = group;
> + /* Get Pending Entry to submit command */
> + /* Always queue 0, because 1 queue per VF */
> + queue = 0;
> + pqueue = &cptvf->pqinfo.queue[queue];
> +
> + if (atomic64_read(&pqueue->pending_count) > PENDING_THOLD) {
> + dev_err(&pdev->dev, "pending threshold reached\n");
> + process_pending_queue(cptvf, &cptvf->pqinfo, queue);
> + }
> +
> +get_pending_entry:
> + spin_lock_bh(&pqueue->lock);
> + pentry = get_free_pending_entry(pqueue, cptvf->pqinfo.qlen);
> + if (unlikely(!pentry)) {
> + spin_unlock_bh(&pqueue->lock);
> + if (clear == 0) {
> + process_pending_queue(cptvf, &cptvf->pqinfo, queue);
> + clear = 1;
> + goto get_pending_entry;
> + }
> + dev_err(&pdev->dev, "Get free entry failed\n");
> + dev_err(&pdev->dev, "queue: %d, rear: %d, front: %d\n",
> + queue, pqueue->rear, pqueue->front);
> + ret = -EFAULT;
> + goto request_cleanup;
> + }
> +
> + pentry->completion_addr = info->completion_addr;
> + pentry->post_arg = (void *)info;
> + pentry->callback = req->callback;
> + pentry->callback_arg = req->callback_arg;
> + info->pentry = pentry;
> + pentry->busy = true;
> + atomic64_inc(&pqueue->pending_count);
> +
> + /* Send CPT command */
> + info->pentry = pentry;
> + info->time_in = jiffies;
> + info->req = req;
> +
> + /* Create the CPT_INST_S type command for HW intrepretation */
> + cptinst.s.doneint = true;
> + cptinst.s.res_addr = (u64)info->comp_baddr;
> + cptinst.s.tag = 0;
> + cptinst.s.grp = 0;
> + cptinst.s.wq_ptr = 0;
> + cptinst.s.ei0 = vq_cmd.cmd.u64;
> + cptinst.s.ei1 = vq_cmd.dptr;
> + cptinst.s.ei2 = vq_cmd.rptr;
> + cptinst.s.ei3 = vq_cmd.cptr.u64;
> +
> + ret = send_cpt_command(cptvf, &cptinst, queue);
> + spin_unlock_bh(&pqueue->lock);
> + if (unlikely(ret)) {
> + dev_err(&pdev->dev, "Send command failed for AE\n");
> + ret = -EFAULT;
> + goto request_cleanup;
> + }
> +
> + return 0;
> +
> +request_cleanup:
> + dev_dbg(&pdev->dev, "Failed to submit CPT command\n");
> + do_request_cleanup(cptvf, info);
> +
> + return ret;
> +}
> +
> +void vq_post_process(struct cpt_vf *cptvf, u32 qno)
> +{
> + struct pci_dev *pdev = cptvf->pdev;
> +
> + if (unlikely(qno > cptvf->nr_queues)) {
> + dev_err(&pdev->dev, "Request for post processing on invalid pending queue: %u\n",
> + qno);
> + return;
> + }
> +
> + process_pending_queue(cptvf, &cptvf->pqinfo, qno);
> +}
> +
> +int cptvf_do_request(void *vfdev, struct cpt_request_info *req)
> +{
> + struct cpt_vf *cptvf = (struct cpt_vf *)vfdev;
> + struct pci_dev *pdev = cptvf->pdev;
> +
> + if (!cpt_device_ready(cptvf)) {
> + dev_err(&pdev->dev, "CPT Device is not ready");
> + return -ENODEV;
> + }
> +
> + if ((cptvf->vftype == SE_TYPES) && (!req->ctrl.s.se_req)) {
> + dev_err(&pdev->dev, "CPTVF-%d of SE TYPE got AE request",
> + cptvf->vfid);
> + return -EINVAL;
> + } else if ((cptvf->vftype == AE_TYPES) && (req->ctrl.s.se_req)) {
> + dev_err(&pdev->dev, "CPTVF-%d of AE TYPE got SE request",
> + cptvf->vfid);
> + return -EINVAL;
> + }
> +
> + return process_request(cptvf, req);
> +}