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 #ifdef PVRDMA_DEBUG
  19 unsigned long pr_dbg_cnt;
  20 #endif
  21
  22 void *rdma_pci_dma_map(PCIDevice *dev, dma_addr_t addr, dma_addr_t plen)
  23 {
  24     void *p;
  25     hwaddr len = plen;
  26
  27     if (!addr) {
  28         pr_dbg("addr is NULL\n");
  29         return NULL;
  30     }
  31
  32     p = pci_dma_map(dev, addr, &len, DMA_DIRECTION_TO_DEVICE);
  33     if (!p) {
  34         pr_dbg("Fail in pci_dma_map, addr=0x%" PRIx64 ", len=%" PRId64 "\n",
  35                addr, len);
  36         return NULL;
  37     }
  38
  39     if (len != plen) {
  40         rdma_pci_dma_unmap(dev, p, len);
  41         return NULL;
  42     }
  43
  44     pr_dbg("0x%" PRIx64 " -> %p (len=% " PRId64 ")\n", addr, p, len);
  45
  46     return p;
  47 }
  48
  49 void rdma_pci_dma_unmap(PCIDevice *dev, void *buffer, dma_addr_t len)
  50 {
  51     pr_dbg("%p\n", buffer);
  52     if (buffer) {
  53         pci_dma_unmap(dev, buffer, len, DMA_DIRECTION_TO_DEVICE, 0);
  54     }
  55 }