1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright (c) 2018, Microsoft Corporation.
13 #include <rte_tailq.h>
15 #include <rte_malloc.h>
17 #include <rte_bus_vmbus.h>
21 static struct rte_tailq_elem vmbus_tailq = {
22 .name = "VMBUS_RESOURCE_LIST",
24 EAL_REGISTER_TAILQ(vmbus_tailq)
27 vmbus_uio_map_secondary(struct rte_vmbus_device *dev)
30 struct vmbus_channel *chan;
31 struct mapped_vmbus_resource *uio_res;
32 struct mapped_vmbus_res_list *uio_res_list
33 = RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
35 TAILQ_FOREACH(uio_res, uio_res_list, next) {
37 /* skip this element if it doesn't match our UUID */
38 if (rte_uuid_compare(uio_res->id, dev->device_id) != 0)
42 fd = open(uio_res->path, O_RDWR);
44 VMBUS_LOG(ERR, "Cannot open %s: %s",
45 uio_res->path, strerror(errno));
49 for (i = 0; i != uio_res->nb_maps; i++) {
51 off_t offset = i * PAGE_SIZE;
53 mapaddr = vmbus_map_resource(uio_res->maps[i].addr,
55 uio_res->maps[i].size, 0);
57 if (mapaddr == uio_res->maps[i].addr)
61 "Cannot mmap device resource file %s to address: %p",
62 uio_res->path, uio_res->maps[i].addr);
64 if (mapaddr != MAP_FAILED)
65 /* unmap addr wrongly mapped */
66 vmbus_unmap_resource(mapaddr,
67 (size_t)uio_res->maps[i].size);
69 /* unmap addrs correctly mapped */
71 vmbus_unmap_resource(uio_res->maps[i].addr,
72 (size_t)uio_res->maps[i].size);
78 /* fd is not needed in slave process, close it */
81 dev->primary = uio_res->primary;
83 VMBUS_LOG(ERR, "missing primary channel");
87 STAILQ_FOREACH(chan, &dev->primary->subchannel_list, next) {
88 if (vmbus_uio_map_secondary_subchan(dev, chan) != 0) {
89 VMBUS_LOG(ERR, "cannot map secondary subchan");
97 VMBUS_LOG(ERR, "Cannot find resource for device");
102 vmbus_uio_map_primary(struct rte_vmbus_device *dev)
105 struct mapped_vmbus_resource *uio_res = NULL;
106 struct mapped_vmbus_res_list *uio_res_list =
107 RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
109 /* allocate uio resource */
110 ret = vmbus_uio_alloc_resource(dev, &uio_res);
114 /* Map the resources */
115 for (i = 0; i < VMBUS_MAX_RESOURCE; i++) {
116 /* stop at empty BAR */
117 if (dev->resource[i].len == 0)
120 ret = vmbus_uio_map_resource_by_index(dev, i, uio_res, 0);
125 uio_res->nb_maps = i;
127 TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
132 vmbus_unmap_resource(uio_res->maps[i].addr,
133 (size_t)uio_res->maps[i].size);
135 vmbus_uio_free_resource(dev, uio_res);
140 struct mapped_vmbus_resource *
141 vmbus_uio_find_resource(const struct rte_vmbus_device *dev)
143 struct mapped_vmbus_resource *uio_res;
144 struct mapped_vmbus_res_list *uio_res_list =
145 RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
150 TAILQ_FOREACH(uio_res, uio_res_list, next) {
151 /* skip this element if it doesn't match our VMBUS address */
152 if (rte_uuid_compare(uio_res->id, dev->device_id) == 0)
158 /* map the VMBUS resource of a VMBUS device in virtual memory */
160 vmbus_uio_map_resource(struct rte_vmbus_device *dev)
162 struct mapped_vmbus_resource *uio_res;
165 /* TODO: handle rescind */
166 dev->intr_handle.fd = -1;
167 dev->intr_handle.uio_cfg_fd = -1;
168 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
170 /* secondary processes - use already recorded details */
171 if (rte_eal_process_type() != RTE_PROC_PRIMARY)
172 ret = vmbus_uio_map_secondary(dev);
174 ret = vmbus_uio_map_primary(dev);
179 uio_res = vmbus_uio_find_resource(dev);
181 VMBUS_LOG(ERR, "can not find resources!");
185 if (uio_res->nb_maps <= HV_MON_PAGE_MAP) {
186 VMBUS_LOG(ERR, "VMBUS: only %u resources found!",
191 dev->int_page = (uint32_t *)((char *)uio_res->maps[HV_INT_PAGE_MAP].addr
193 dev->monitor_page = uio_res->maps[HV_MON_PAGE_MAP].addr;
198 vmbus_uio_unmap(struct mapped_vmbus_resource *uio_res)
205 for (i = 0; i != uio_res->nb_maps; i++) {
206 vmbus_unmap_resource(uio_res->maps[i].addr,
207 (size_t)uio_res->maps[i].size);
211 /* unmap the VMBUS resource of a VMBUS device in virtual memory */
213 vmbus_uio_unmap_resource(struct rte_vmbus_device *dev)
215 struct mapped_vmbus_resource *uio_res;
216 struct mapped_vmbus_res_list *uio_res_list =
217 RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
222 /* find an entry for the device */
223 uio_res = vmbus_uio_find_resource(dev);
227 /* secondary processes - just free maps */
228 if (rte_eal_process_type() != RTE_PROC_PRIMARY)
229 return vmbus_uio_unmap(uio_res);
231 TAILQ_REMOVE(uio_res_list, uio_res, next);
233 /* unmap all resources */
234 vmbus_uio_unmap(uio_res);
236 /* free uio resource */
239 /* close fd if in primary process */
240 close(dev->intr_handle.fd);
241 if (dev->intr_handle.uio_cfg_fd >= 0) {
242 close(dev->intr_handle.uio_cfg_fd);
243 dev->intr_handle.uio_cfg_fd = -1;
246 dev->intr_handle.fd = -1;
247 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;