drivers/scsi/snic/vnic_cq.c

   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
  24 void 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
  31 int 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
  53 void 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
  76 void 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 }