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
rdma_pci_dma_map(PCIDevice * dev,dma_addr_t addr,dma_addr_t len)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
rdma_pci_dma_unmap(PCIDevice * dev,void * buffer,dma_addr_t len)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
rdma_protected_gqueue_init(RdmaProtectedGQueue * list)56 void rdma_protected_gqueue_init(RdmaProtectedGQueue *list)
57 {
58 qemu_mutex_init(&list->lock);
59 list->list = g_queue_new();
60 }
61
rdma_protected_gqueue_destroy(RdmaProtectedGQueue * list)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
rdma_protected_gqueue_append_int64(RdmaProtectedGQueue * list,int64_t value)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
rdma_protected_gqueue_pop_int64(RdmaProtectedGQueue * list)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
rdma_protected_gslist_init(RdmaProtectedGSList * list)98 void rdma_protected_gslist_init(RdmaProtectedGSList *list)
99 {
100 qemu_mutex_init(&list->lock);
101 }
102
rdma_protected_gslist_destroy(RdmaProtectedGSList * list)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
rdma_protected_gslist_append_int32(RdmaProtectedGSList * list,int32_t value)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
rdma_protected_gslist_remove_int32(RdmaProtectedGSList * list,int32_t value)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 }
127