drivers/scsi/fnic/vnic_cq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6 #include <linux/errno.h>
   7 #include <linux/types.h>
   8 #include <linux/pci.h>
   9 #include "vnic_dev.h"
  10 #include "vnic_cq.h"
  11
  12 void vnic_cq_free(struct vnic_cq *cq)
  13 {
  14         vnic_dev_free_desc_ring(cq->vdev, &cq->ring);
  15
  16         cq->ctrl = NULL;
  17 }
  18
  19 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
  20         unsigned int desc_count, unsigned int desc_size)
  21 {
  22         int err;
  23
  24         cq->index = index;
  25         cq->vdev = vdev;
  26
  27         cq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_CQ, index);
  28         if (!cq->ctrl) {
  29                 printk(KERN_ERR "Failed to hook CQ[%d] resource\n", index);
  30                 return -EINVAL;
  31         }
  32
  33         err = vnic_dev_alloc_desc_ring(vdev, &cq->ring, desc_count, desc_size);
  34         if (err)
  35                 return err;
  36
  37         return 0;
  38 }
  39
  40 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
  41         unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
  42         unsigned int cq_tail_color, unsigned int interrupt_enable,
  43         unsigned int cq_entry_enable, unsigned int cq_message_enable,
  44         unsigned int interrupt_offset, u64 cq_message_addr)
  45 {
  46         u64 paddr;
  47
  48         paddr = (u64)cq->ring.base_addr | VNIC_PADDR_TARGET;
  49         writeq(paddr, &cq->ctrl->ring_base);
  50         iowrite32(cq->ring.desc_count, &cq->ctrl->ring_size);
  51         iowrite32(flow_control_enable, &cq->ctrl->flow_control_enable);
  52         iowrite32(color_enable, &cq->ctrl->color_enable);
  53         iowrite32(cq_head, &cq->ctrl->cq_head);
  54         iowrite32(cq_tail, &cq->ctrl->cq_tail);
  55         iowrite32(cq_tail_color, &cq->ctrl->cq_tail_color);
  56         iowrite32(interrupt_enable, &cq->ctrl->interrupt_enable);
  57         iowrite32(cq_entry_enable, &cq->ctrl->cq_entry_enable);
  58         iowrite32(cq_message_enable, &cq->ctrl->cq_message_enable);
  59         iowrite32(interrupt_offset, &cq->ctrl->interrupt_offset);
  60         writeq(cq_message_addr, &cq->ctrl->cq_message_addr);
  61 }
  62
  63 void vnic_cq_clean(struct vnic_cq *cq)
  64 {
  65         cq->to_clean = 0;
  66         cq->last_color = 0;
  67
  68         iowrite32(0, &cq->ctrl->cq_head);
  69         iowrite32(0, &cq->ctrl->cq_tail);
  70         iowrite32(1, &cq->ctrl->cq_tail_color);
  71
  72         vnic_dev_clear_desc_ring(&cq->ring);
  73 }