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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2015 Intel Corporation
*/
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <rte_eal.h>
#include <rte_pci.h>
#include <rte_bus_pci.h>
#include <rte_tailq.h>
#include <rte_log.h>
#include <rte_malloc.h>
#include "private.h"
static struct rte_tailq_elem rte_uio_tailq = {
.name = "UIO_RESOURCE_LIST",
};
EAL_REGISTER_TAILQ(rte_uio_tailq)
static int
pci_uio_map_secondary(struct rte_pci_device *dev)
{
int fd, i, j;
struct mapped_pci_resource *uio_res;
struct mapped_pci_res_list *uio_res_list =
RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
TAILQ_FOREACH(uio_res, uio_res_list, next) {
/* skip this element if it doesn't match our PCI address */
if (rte_pci_addr_cmp(&uio_res->pci_addr, &dev->addr))
continue;
for (i = 0; i != uio_res->nb_maps; i++) {
/*
* open devname, to mmap it
*/
fd = open(uio_res->maps[i].path, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
uio_res->maps[i].path, strerror(errno));
return -1;
}
void *mapaddr = pci_map_resource(uio_res->maps[i].addr,
fd, (off_t)uio_res->maps[i].offset,
(size_t)uio_res->maps[i].size, 0);
/* fd is not needed in slave process, close it */
close(fd);
if (mapaddr != uio_res->maps[i].addr) {
RTE_LOG(ERR, EAL,
"Cannot mmap device resource file %s to address: %p\n",
uio_res->maps[i].path,
uio_res->maps[i].addr);
if (mapaddr != MAP_FAILED) {
/* unmap addrs correctly mapped */
for (j = 0; j < i; j++)
pci_unmap_resource(
uio_res->maps[j].addr,
(size_t)uio_res->maps[j].size);
/* unmap addr wrongly mapped */
pci_unmap_resource(mapaddr,
(size_t)uio_res->maps[i].size);
}
return -1;
}
}
return 0;
}
RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
return 1;
}
/* map the PCI resource of a PCI device in virtual memory */
int
pci_uio_map_resource(struct rte_pci_device *dev)
{
int i, map_idx = 0, ret;
uint64_t phaddr;
struct mapped_pci_resource *uio_res = NULL;
struct mapped_pci_res_list *uio_res_list =
RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
dev->intr_handle.fd = -1;
dev->intr_handle.uio_cfg_fd = -1;
/* secondary processes - use already recorded details */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
return pci_uio_map_secondary(dev);
/* allocate uio resource */
ret = pci_uio_alloc_resource(dev, &uio_res);
if (ret)
return ret;
/* Map all BARs */
for (i = 0; i != PCI_MAX_RESOURCE; i++) {
/* skip empty BAR */
phaddr = dev->mem_resource[i].phys_addr;
if (phaddr == 0)
continue;
ret = pci_uio_map_resource_by_index(dev, i,
uio_res, map_idx);
if (ret)
goto error;
map_idx++;
}
uio_res->nb_maps = map_idx;
TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
return 0;
error:
for (i = 0; i < map_idx; i++) {
pci_unmap_resource(uio_res->maps[i].addr,
(size_t)uio_res->maps[i].size);
rte_free(uio_res->maps[i].path);
}
pci_uio_free_resource(dev, uio_res);
return -1;
}
static void
pci_uio_unmap(struct mapped_pci_resource *uio_res)
{
int i;
if (uio_res == NULL)
return;
for (i = 0; i != uio_res->nb_maps; i++) {
pci_unmap_resource(uio_res->maps[i].addr,
(size_t)uio_res->maps[i].size);
if (rte_eal_process_type() == RTE_PROC_PRIMARY)
rte_free(uio_res->maps[i].path);
}
}
static struct mapped_pci_resource *
pci_uio_find_resource(struct rte_pci_device *dev)
{
struct mapped_pci_resource *uio_res;
struct mapped_pci_res_list *uio_res_list =
RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
if (dev == NULL)
return NULL;
TAILQ_FOREACH(uio_res, uio_res_list, next) {
/* skip this element if it doesn't match our PCI address */
if (!rte_pci_addr_cmp(&uio_res->pci_addr, &dev->addr))
return uio_res;
}
return NULL;
}
/* unmap the PCI resource of a PCI device in virtual memory */
void
pci_uio_unmap_resource(struct rte_pci_device *dev)
{
struct mapped_pci_resource *uio_res;
struct mapped_pci_res_list *uio_res_list =
RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
if (dev == NULL)
return;
/* find an entry for the device */
uio_res = pci_uio_find_resource(dev);
if (uio_res == NULL)
return;
/* secondary processes - just free maps */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
return pci_uio_unmap(uio_res);
TAILQ_REMOVE(uio_res_list, uio_res, next);
/* unmap all resources */
pci_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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