LXR linux/drivers/scsi/snic/vnic

   1/*
   2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3 *
   4 * This program is free software; you may redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15 * SOFTWARE.
  16 */
  17
  18#include <linux/errno.h>
  19#include <linux/types.h>
  20#include <linux/pci.h>
  21#include "vnic_dev.h"
  22#include "vnic_cq.h"
  23
  24void svnic_cq_free(struct vnic_cq *cq)
  25{
  26        svnic_dev_free_desc_ring(cq->vdev, &cq->ring);
  27
  28        cq->ctrl = NULL;
  29}
  30
  31int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
  32        unsigned int index, unsigned int desc_count, unsigned int desc_size)
  33{
  34        int err;
  35
  36        cq->index = index;
  37        cq->vdev = vdev;
  38
  39        cq->ctrl = svnic_dev_get_res(vdev, RES_TYPE_CQ, index);
  40        if (!cq->ctrl) {
  41                pr_err("Failed to hook CQ[%d] resource\n", index);
  42
  43                return -EINVAL;
  44        }
  45
  46        err = svnic_dev_alloc_desc_ring(vdev, &cq->ring, desc_count, desc_size);
  47        if (err)
  48                return err;
  49
  50        return 0;
  51}
  52
  53void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
  54        unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
  55        unsigned int cq_tail_color, unsigned int interrupt_enable,
  56        unsigned int cq_entry_enable, unsigned int cq_message_enable,
  57        unsigned int interrupt_offset, u64 cq_message_addr)
  58{
  59        u64 paddr;
  60
  61        paddr = (u64)cq->ring.base_addr | VNIC_PADDR_TARGET;
  62        writeq(paddr, &cq->ctrl->ring_base);
  63        iowrite32(cq->ring.desc_count, &cq->ctrl->ring_size);
  64        iowrite32(flow_control_enable, &cq->ctrl->flow_control_enable);
  65        iowrite32(color_enable, &cq->ctrl->color_enable);
  66        iowrite32(cq_head, &cq->ctrl->cq_head);
  67        iowrite32(cq_tail, &cq->ctrl->cq_tail);
  68        iowrite32(cq_tail_color, &cq->ctrl->cq_tail_color);
  69        iowrite32(interrupt_enable, &cq->ctrl->interrupt_enable);
  70        iowrite32(cq_entry_enable, &cq->ctrl->cq_entry_enable);
  71        iowrite32(cq_message_enable, &cq->ctrl->cq_message_enable);
  72        iowrite32(interrupt_offset, &cq->ctrl->interrupt_offset);
  73        writeq(cq_message_addr, &cq->ctrl->cq_message_addr);
  74}
  75
  76void svnic_cq_clean(struct vnic_cq *cq)
  77{
  78        cq->to_clean = 0;
  79        cq->last_color = 0;
  80
  81        iowrite32(0, &cq->ctrl->cq_head);
  82        iowrite32(0, &cq->ctrl->cq_tail);
  83        iowrite32(1, &cq->ctrl->cq_tail_color);
  84
  85        svnic_dev_clear_desc_ring(&cq->ring);
  86}
  87