drivers/scsi/fnic/vnic_wq_copy.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
   7 #include <linux/errno.h>
   8 #include <linux/types.h>
   9 #include <linux/pci.h>
  10 #include <linux/delay.h>
  11 #include "vnic_wq_copy.h"
  12
  13 void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
  14 {
  15         iowrite32(1, &wq->ctrl->enable);
  16 }
  17
  18 int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
  19 {
  20         unsigned int wait;
  21
  22         iowrite32(0, &wq->ctrl->enable);
  23
  24         /* Wait for HW to ACK disable request */
  25         for (wait = 0; wait < 100; wait++) {
  26                 if (!(ioread32(&wq->ctrl->running)))
  27                         return 0;
  28                 udelay(1);
  29         }
  30
  31         printk(KERN_ERR "Failed to disable Copy WQ[%d],"
  32                " fetch index=%d, posted_index=%d\n",
  33                wq->index, ioread32(&wq->ctrl->fetch_index),
  34                ioread32(&wq->ctrl->posted_index));
  35
  36         return -ENODEV;
  37 }
  38
  39 void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
  40         void (*q_clean)(struct vnic_wq_copy *wq,
  41         struct fcpio_host_req *wq_desc))
  42 {
  43         BUG_ON(ioread32(&wq->ctrl->enable));
  44
  45         if (vnic_wq_copy_desc_in_use(wq))
  46                 vnic_wq_copy_service(wq, -1, q_clean);
  47
  48         wq->to_use_index = wq->to_clean_index = 0;
  49
  50         iowrite32(0, &wq->ctrl->fetch_index);
  51         iowrite32(0, &wq->ctrl->posted_index);
  52         iowrite32(0, &wq->ctrl->error_status);
  53
  54         vnic_dev_clear_desc_ring(&wq->ring);
  55 }
  56
  57 void vnic_wq_copy_free(struct vnic_wq_copy *wq)
  58 {
  59         struct vnic_dev *vdev;
  60
  61         vdev = wq->vdev;
  62         vnic_dev_free_desc_ring(vdev, &wq->ring);
  63         wq->ctrl = NULL;
  64 }
  65
  66 int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
  67                        unsigned int index, unsigned int desc_count,
  68                        unsigned int desc_size)
  69 {
  70         wq->index = index;
  71         wq->vdev = vdev;
  72         wq->to_use_index = wq->to_clean_index = 0;
  73         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  74         if (!wq->ctrl) {
  75                 printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
  76                 return -EINVAL;
  77         }
  78
  79         vnic_wq_copy_disable(wq);
  80
  81         return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
  82 }
  83
  84 void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
  85         unsigned int error_interrupt_enable,
  86         unsigned int error_interrupt_offset)
  87 {
  88         u64 paddr;
  89
  90         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
  91         writeq(paddr, &wq->ctrl->ring_base);
  92         iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
  93         iowrite32(0, &wq->ctrl->fetch_index);
  94         iowrite32(0, &wq->ctrl->posted_index);
  95         iowrite32(cq_index, &wq->ctrl->cq_index);
  96         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
  97         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
  98 }