hw/rdma: Add wrappers and macros

As all mapping for this device are from driver to device,
declare wrappers on top of pci_dma_*map functions.

In addition, declare macros to be used for debug messages.

Reviewed-by: Dotan Barak <dotanb@mellanox.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/hw/rdma/rdma_utils.c b/hw/rdma/rdma_utils.c
new file mode 100644
index 0000000..0e5caff
--- /dev/null
+++ b/hw/rdma/rdma_utils.c
@@ -0,0 +1,51 @@
+/*
+ * QEMU paravirtual RDMA - Generic RDMA backend
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "rdma_utils.h"
+
+void *rdma_pci_dma_map(PCIDevice *dev, dma_addr_t addr, dma_addr_t plen)
+{
+    void *p;
+    hwaddr len = plen;
+
+    if (!addr) {
+        pr_dbg("addr is NULL\n");
+        return NULL;
+    }
+
+    p = pci_dma_map(dev, addr, &len, DMA_DIRECTION_TO_DEVICE);
+    if (!p) {
+        pr_dbg("Fail in pci_dma_map, addr=0x%llx, len=%ld\n",
+               (long long unsigned int)addr, len);
+        return NULL;
+    }
+
+    if (len != plen) {
+        rdma_pci_dma_unmap(dev, p, len);
+        return NULL;
+    }
+
+    pr_dbg("0x%llx -> %p (len=%ld)\n", (long long unsigned int)addr, p, len);
+
+    return p;
+}
+
+void rdma_pci_dma_unmap(PCIDevice *dev, void *buffer, dma_addr_t len)
+{
+    pr_dbg("%p\n", buffer);
+    if (buffer) {
+        pci_dma_unmap(dev, buffer, len, DMA_DIRECTION_TO_DEVICE, 0);
+    }
+}