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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 2018, Microsoft Corporation.
* All Rights Reserved.
*/
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <rte_eal.h>
#include <rte_tailq.h>
#include <rte_log.h>
#include <rte_malloc.h>
#include <rte_bus.h>
#include <rte_bus_vmbus.h>
#include "private.h"
static struct rte_tailq_elem vmbus_tailq = {
.name = "VMBUS_RESOURCE_LIST",
};
EAL_REGISTER_TAILQ(vmbus_tailq)
static int
vmbus_uio_map_secondary(struct rte_vmbus_device *dev)
{
int fd, i;
struct mapped_vmbus_resource *uio_res;
struct mapped_vmbus_res_list *uio_res_list
= RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
TAILQ_FOREACH(uio_res, uio_res_list, next) {
/* skip this element if it doesn't match our UUID */
if (rte_uuid_compare(uio_res->id, dev->device_id) != 0)
continue;
/* open /dev/uioX */
fd = open(uio_res->path, O_RDWR);
if (fd < 0) {
VMBUS_LOG(ERR, "Cannot open %s: %s",
uio_res->path, strerror(errno));
return -1;
}
for (i = 0; i != uio_res->nb_maps; i++) {
void *mapaddr;
mapaddr = vmbus_map_resource(uio_res->maps[i].addr,
fd, 0,
uio_res->maps[i].size, 0);
if (mapaddr == uio_res->maps[i].addr)
continue;
VMBUS_LOG(ERR,
"Cannot mmap device resource file %s to address: %p",
uio_res->path, uio_res->maps[i].addr);
if (mapaddr != MAP_FAILED)
/* unmap addr wrongly mapped */
vmbus_unmap_resource(mapaddr,
(size_t)uio_res->maps[i].size);
/* unmap addrs correctly mapped */
while (--i >= 0)
vmbus_unmap_resource(uio_res->maps[i].addr,
(size_t)uio_res->maps[i].size);
close(fd);
return -1;
}
/* fd is not needed in slave process, close it */
close(fd);
return 0;
}
VMBUS_LOG(ERR, "Cannot find resource for device");
return 1;
}
static int
vmbus_uio_map_primary(struct rte_vmbus_device *dev)
{
int i, ret;
struct mapped_vmbus_resource *uio_res = NULL;
struct mapped_vmbus_res_list *uio_res_list =
RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
/* allocate uio resource */
ret = vmbus_uio_alloc_resource(dev, &uio_res);
if (ret)
return ret;
/* Map the resources */
for (i = 0; i < VMBUS_MAX_RESOURCE; i++) {
/* skip empty BAR */
if (dev->resource[i].len == 0)
continue;
ret = vmbus_uio_map_resource_by_index(dev, i, uio_res, 0);
if (ret)
goto error;
}
uio_res->nb_maps = i;
TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
return 0;
error:
while (--i >= 0) {
vmbus_unmap_resource(uio_res->maps[i].addr,
(size_t)uio_res->maps[i].size);
}
vmbus_uio_free_resource(dev, uio_res);
return -1;
}
struct mapped_vmbus_resource *
vmbus_uio_find_resource(const struct rte_vmbus_device *dev)
{
struct mapped_vmbus_resource *uio_res;
struct mapped_vmbus_res_list *uio_res_list =
RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
if (dev == NULL)
return NULL;
TAILQ_FOREACH(uio_res, uio_res_list, next) {
/* skip this element if it doesn't match our VMBUS address */
if (rte_uuid_compare(uio_res->id, dev->device_id) == 0)
return uio_res;
}
return NULL;
}
/* map the VMBUS resource of a VMBUS device in virtual memory */
int
vmbus_uio_map_resource(struct rte_vmbus_device *dev)
{
struct mapped_vmbus_resource *uio_res;
int ret;
/* TODO: handle rescind */
dev->intr_handle.fd = -1;
dev->intr_handle.uio_cfg_fd = -1;
dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
/* secondary processes - use already recorded details */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
ret = vmbus_uio_map_secondary(dev);
else
ret = vmbus_uio_map_primary(dev);
if (ret != 0)
return ret;
uio_res = vmbus_uio_find_resource(dev);
if (!uio_res) {
VMBUS_LOG(ERR, "can not find resources!");
return -EIO;
}
if (uio_res->nb_maps <= HV_MON_PAGE_MAP) {
VMBUS_LOG(ERR, "VMBUS: only %u resources found!",
uio_res->nb_maps);
return -EINVAL;
}
dev->int_page = (uint32_t *)((char *)uio_res->maps[HV_INT_PAGE_MAP].addr
+ (PAGE_SIZE >> 1));
dev->monitor_page = uio_res->maps[HV_MON_PAGE_MAP].addr;
return 0;
}
static void
vmbus_uio_unmap(struct mapped_vmbus_resource *uio_res)
{
int i;
if (uio_res == NULL)
return;
for (i = 0; i != uio_res->nb_maps; i++) {
vmbus_unmap_resource(uio_res->maps[i].addr,
(size_t)uio_res->maps[i].size);
}
}
/* unmap the VMBUS resource of a VMBUS device in virtual memory */
void
vmbus_uio_unmap_resource(struct rte_vmbus_device *dev)
{
struct mapped_vmbus_resource *uio_res;
struct mapped_vmbus_res_list *uio_res_list =
RTE_TAILQ_CAST(vmbus_tailq.head, mapped_vmbus_res_list);
if (dev == NULL)
return;
/* find an entry for the device */
uio_res = vmbus_uio_find_resource(dev);
if (uio_res == NULL)
return;
/* secondary processes - just free maps */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
return vmbus_uio_unmap(uio_res);
TAILQ_REMOVE(uio_res_list, uio_res, next);
/* unmap all resources */
vmbus_uio_unmap(uio_res);
/* free uio resource */
rte_free(uio_res);
/* close fd if in primary process */
close(dev->intr_handle.fd);
if (dev->intr_handle.uio_cfg_fd >= 0) {
close(dev->intr_handle.uio_cfg_fd);
dev->intr_handle.uio_cfg_fd = -1;
}
dev->intr_handle.fd = -1;
dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
}
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