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 "qemu/osdep.h"
  17 #include "rdma_utils.h"
  18
  19 #ifdef PVRDMA_DEBUG
  20 unsigned long pr_dbg_cnt;
  21 #endif
  22
  23 void *rdma_pci_dma_map(PCIDevice *dev, dma_addr_t addr, dma_addr_t plen)
  24 {
  25     void *p;
  26     hwaddr len = plen;
  27
  28     if (!addr) {
  29         pr_dbg("addr is NULL\n");
  30         return NULL;
  31     }
  32
  33     p = pci_dma_map(dev, addr, &len, DMA_DIRECTION_TO_DEVICE);
  34     if (!p) {
  35         pr_dbg("Fail in pci_dma_map, addr=0x%" PRIx64 ", len=%" PRId64 "\n",
  36                addr, len);
  37         return NULL;
  38     }
  39
  40     if (len != plen) {
  41         rdma_pci_dma_unmap(dev, p, len);
  42         return NULL;
  43     }
  44
  45     pr_dbg("0x%" PRIx64 " -> %p (len=% " PRId64 ")\n", addr, p, len);
  46
  47     return p;
  48 }
  49
  50 void rdma_pci_dma_unmap(PCIDevice *dev, void *buffer, dma_addr_t len)
  51 {
  52     pr_dbg("%p\n", buffer);
  53     if (buffer) {
  54         pci_dma_unmap(dev, buffer, len, DMA_DIRECTION_TO_DEVICE, 0);
  55     }
  56 }