hw/rdma/rdma_utils.c

   1 /*
   2  * QEMU paravirtual RDMA - Generic RDMA backend
   3  *
   4  * Copyright (C) 2018 Oracle
   5  * Copyright (C) 2018 Red Hat Inc
   6  *
   7  * Authors:
   8  *     Yuval Shaia <yuval.shaia@oracle.com>
   9  *     Marcel Apfelbaum <marcel@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15
  16 #include "rdma_utils.h"
  17
  18 void *rdma_pci_dma_map(PCIDevice *dev, dma_addr_t addr, dma_addr_t plen)
  19 {
  20     void *p;
  21     hwaddr len = plen;
  22
  23     if (!addr) {
  24         pr_dbg("addr is NULL\n");
  25         return NULL;
  26     }
  27
  28     p = pci_dma_map(dev, addr, &len, DMA_DIRECTION_TO_DEVICE);
  29     if (!p) {
  30         pr_dbg("Fail in pci_dma_map, addr=0x%llx, len=%ld\n",
  31                (long long unsigned int)addr, len);
  32         return NULL;
  33     }
  34
  35     if (len != plen) {
  36         rdma_pci_dma_unmap(dev, p, len);
  37         return NULL;
  38     }
  39
  40     pr_dbg("0x%llx -> %p (len=%ld)\n", (long long unsigned int)addr, p, len);
  41
  42     return p;
  43 }
  44
  45 void rdma_pci_dma_unmap(PCIDevice *dev, void *buffer, dma_addr_t len)
  46 {
  47     pr_dbg("%p\n", buffer);
  48     if (buffer) {
  49         pci_dma_unmap(dev, buffer, len, DMA_DIRECTION_TO_DEVICE, 0);
  50     }
  51 }