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 "hw/pci/pci_device.h"
  18 #include "trace.h"
  19 #include "rdma_utils.h"
  20
  21 void *rdma_pci_dma_map(PCIDevice *dev, dma_addr_t addr, dma_addr_t len)
  22 {
  23     void *p;
  24     dma_addr_t pci_len = len;
  25
  26     if (!addr) {
  27         rdma_error_report("addr is NULL");
  28         return NULL;
  29     }
  30
  31     p = pci_dma_map(dev, addr, &pci_len, DMA_DIRECTION_TO_DEVICE);
  32     if (!p) {
  33         rdma_error_report("pci_dma_map fail, addr=0x%"PRIx64", len=%"PRId64,
  34                           addr, pci_len);
  35         return NULL;
  36     }
  37
  38     if (pci_len != len) {
  39         rdma_pci_dma_unmap(dev, p, pci_len);
  40         return NULL;
  41     }
  42
  43     trace_rdma_pci_dma_map(addr, p, pci_len);
  44
  45     return p;
  46 }
  47
  48 void rdma_pci_dma_unmap(PCIDevice *dev, void *buffer, dma_addr_t len)
  49 {
  50     trace_rdma_pci_dma_unmap(buffer);
  51     if (buffer) {
  52         pci_dma_unmap(dev, buffer, len, DMA_DIRECTION_TO_DEVICE, 0);
  53     }
  54 }
  55
  56 void rdma_protected_gqueue_init(RdmaProtectedGQueue *list)
  57 {
  58     qemu_mutex_init(&list->lock);
  59     list->list = g_queue_new();
  60 }
  61
  62 void rdma_protected_gqueue_destroy(RdmaProtectedGQueue *list)
  63 {
  64     if (list->list) {
  65         g_queue_free_full(list->list, g_free);
  66         qemu_mutex_destroy(&list->lock);
  67         list->list = NULL;
  68     }
  69 }
  70
  71 void rdma_protected_gqueue_append_int64(RdmaProtectedGQueue *list,
  72                                         int64_t value)
  73 {
  74     qemu_mutex_lock(&list->lock);
  75     g_queue_push_tail(list->list, g_memdup(&value, sizeof(value)));
  76     qemu_mutex_unlock(&list->lock);
  77 }
  78
  79 int64_t rdma_protected_gqueue_pop_int64(RdmaProtectedGQueue *list)
  80 {
  81     int64_t *valp;
  82     int64_t val;
  83
  84     qemu_mutex_lock(&list->lock);
  85
  86     valp = g_queue_pop_head(list->list);
  87     qemu_mutex_unlock(&list->lock);
  88
  89     if (!valp) {
  90         return -ENOENT;
  91     }
  92
  93     val = *valp;
  94     g_free(valp);
  95     return val;
  96 }
  97
  98 void rdma_protected_gslist_init(RdmaProtectedGSList *list)
  99 {
 100     qemu_mutex_init(&list->lock);
 101 }
 102
 103 void rdma_protected_gslist_destroy(RdmaProtectedGSList *list)
 104 {
 105     if (list->list) {
 106         g_slist_free(list->list);
 107         qemu_mutex_destroy(&list->lock);
 108         list->list = NULL;
 109     }
 110 }
 111
 112 void rdma_protected_gslist_append_int32(RdmaProtectedGSList *list,
 113                                         int32_t value)
 114 {
 115     qemu_mutex_lock(&list->lock);
 116     list->list = g_slist_prepend(list->list, GINT_TO_POINTER(value));
 117     qemu_mutex_unlock(&list->lock);
 118 }
 119
 120 void rdma_protected_gslist_remove_int32(RdmaProtectedGSList *list,
 121                                         int32_t value)
 122 {
 123     qemu_mutex_lock(&list->lock);
 124     list->list = g_slist_remove(list->list, GINT_TO_POINTER(value));
 125     qemu_mutex_unlock(&list->lock);
 126 }