drivers/scsi/snic/vnic_cq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3
   4 #include <linux/errno.h>
   5 #include <linux/types.h>
   6 #include <linux/pci.h>
   7 #include "vnic_dev.h"
   8 #include "vnic_cq.h"
   9
  10 void svnic_cq_free(struct vnic_cq *cq)
  11 {
  12         svnic_dev_free_desc_ring(cq->vdev, &cq->ring);
  13
  14         cq->ctrl = NULL;
  15 }
  16
  17 int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
  18         unsigned int index, unsigned int desc_count, unsigned int desc_size)
  19 {
  20         cq->index = index;
  21         cq->vdev = vdev;
  22
  23         cq->ctrl = svnic_dev_get_res(vdev, RES_TYPE_CQ, index);
  24         if (!cq->ctrl) {
  25                 pr_err("Failed to hook CQ[%d] resource\n", index);
  26
  27                 return -EINVAL;
  28         }
  29
  30         return svnic_dev_alloc_desc_ring(vdev, &cq->ring, desc_count, desc_size);
  31 }
  32
  33 void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
  34         unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
  35         unsigned int cq_tail_color, unsigned int interrupt_enable,
  36         unsigned int cq_entry_enable, unsigned int cq_message_enable,
  37         unsigned int interrupt_offset, u64 cq_message_addr)
  38 {
  39         u64 paddr;
  40
  41         paddr = (u64)cq->ring.base_addr | VNIC_PADDR_TARGET;
  42         writeq(paddr, &cq->ctrl->ring_base);
  43         iowrite32(cq->ring.desc_count, &cq->ctrl->ring_size);
  44         iowrite32(flow_control_enable, &cq->ctrl->flow_control_enable);
  45         iowrite32(color_enable, &cq->ctrl->color_enable);
  46         iowrite32(cq_head, &cq->ctrl->cq_head);
  47         iowrite32(cq_tail, &cq->ctrl->cq_tail);
  48         iowrite32(cq_tail_color, &cq->ctrl->cq_tail_color);
  49         iowrite32(interrupt_enable, &cq->ctrl->interrupt_enable);
  50         iowrite32(cq_entry_enable, &cq->ctrl->cq_entry_enable);
  51         iowrite32(cq_message_enable, &cq->ctrl->cq_message_enable);
  52         iowrite32(interrupt_offset, &cq->ctrl->interrupt_offset);
  53         writeq(cq_message_addr, &cq->ctrl->cq_message_addr);
  54 }
  55
  56 void svnic_cq_clean(struct vnic_cq *cq)
  57 {
  58         cq->to_clean = 0;
  59         cq->last_color = 0;
  60
  61         iowrite32(0, &cq->ctrl->cq_head);
  62         iowrite32(0, &cq->ctrl->cq_tail);
  63         iowrite32(1, &cq->ctrl->cq_tail_color);
  64
  65         svnic_dev_clear_desc_ring(&cq->ring);
  66 }