qemu

FORK: QEMU emulator
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rdma_utils.c (2984B)

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