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pci: move uio mapping in a dedicated file

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Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>
This commit is contained in:
Anatoly Burakov 2014-06-13 15:52:36 +01:00 committed by Thomas Monjalon
parent 46a6fa8793
commit 67c536bdad
4 changed files with 492 additions and 399 deletions
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1
lib/librte_eal/linuxapp/eal/Makefile
View File

@ -57,6 +57,7 @@ endif
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_thread.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_log.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci_uio.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_debug.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_lcore.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_timer.c

403
lib/librte_eal/linuxapp/eal/eal_pci.c
View File

@ -32,8 +32,6 @@
*/
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/mman.h>
@ -47,6 +45,7 @@
#include "rte_pci_dev_ids.h"
#include "eal_filesystem.h"
#include "eal_private.h"
#include "eal_pci_init.h"
/**
* @file
@ -57,30 +56,7 @@
* IGB_UIO driver (or doesn't initialize, if the device wasn't bound to it).
*/
struct pci_map {
void *addr;
uint64_t offset;
uint64_t size;
uint64_t phaddr;
};
/*
* For multi-process we need to reproduce all PCI mappings in secondary
* processes, so save them in a tailq.
*/
struct mapped_pci_resource {
TAILQ_ENTRY(mapped_pci_resource) next;
struct rte_pci_addr pci_addr;
char path[PATH_MAX];
int nb_maps;
struct pci_map maps[PCI_MAX_RESOURCE];
};
TAILQ_HEAD(mapped_pci_res_list, mapped_pci_resource);
static struct mapped_pci_res_list *pci_res_list;
static int pci_parse_sysfs_value(const char *filename, uint64_t *val);
struct mapped_pci_res_list *pci_res_list = NULL;
/* unbind kernel driver for this device */
static int
@ -122,8 +98,8 @@ error:
}
/* map a particular resource from a file */
static void *
pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size)
void *
pci_map_resource(void * requested_addr, int fd, off_t offset, size_t size)
{
void *mapaddr;
@ -147,342 +123,6 @@ fail:
return NULL;
}
#define OFF_MAX ((uint64_t)(off_t)-1)
static int
pci_uio_get_mappings(const char *devname, struct pci_map maps[], int nb_maps)
{
int i;
char dirname[PATH_MAX];
char filename[PATH_MAX];
uint64_t offset, size;
for (i = 0; i != nb_maps; i++) {
/* check if map directory exists */
rte_snprintf(dirname, sizeof(dirname),
"%s/maps/map%u", devname, i);
if (access(dirname, F_OK) != 0)
break;
/* get mapping offset */
rte_snprintf(filename, sizeof(filename),
"%s/offset", dirname);
if (pci_parse_sysfs_value(filename, &offset) < 0) {
RTE_LOG(ERR, EAL,
"%s(): cannot parse offset of %s\n",
__func__, dirname);
return (-1);
}
/* get mapping size */
rte_snprintf(filename, sizeof(filename),
"%s/size", dirname);
if (pci_parse_sysfs_value(filename, &size) < 0) {
RTE_LOG(ERR, EAL,
"%s(): cannot parse size of %s\n",
__func__, dirname);
return (-1);
}
/* get mapping physical address */
rte_snprintf(filename, sizeof(filename),
"%s/addr", dirname);
if (pci_parse_sysfs_value(filename, &maps[i].phaddr) < 0) {
RTE_LOG(ERR, EAL,
"%s(): cannot parse addr of %s\n",
__func__, dirname);
return (-1);
}
if ((offset > OFF_MAX) || (size > SIZE_MAX)) {
RTE_LOG(ERR, EAL,
"%s(): offset/size exceed system max value\n",
__func__);
return (-1);
}
maps[i].offset = offset;
maps[i].size = size;
}
return (i);
}
static int
pci_uio_map_secondary(struct rte_pci_device *dev)
{
int fd, i;
struct mapped_pci_resource *uio_res;
TAILQ_FOREACH(uio_res, pci_res_list, next) {
/* skip this element if it doesn't match our PCI address */
if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
continue;
for (i = 0; i != uio_res->nb_maps; i++) {
/*
* open devname, to mmap it
*/
fd = open(uio_res->path, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
uio_res->path, strerror(errno));
return -1;
}
if (pci_map_resource(uio_res->maps[i].addr, fd,
(off_t)uio_res->maps[i].offset,
(size_t)uio_res->maps[i].size)
!= uio_res->maps[i].addr) {
RTE_LOG(ERR, EAL,
"Cannot mmap device resource\n");
close(fd);
return (-1);
}
/* fd is not needed in slave process, close it */
close(fd);
}
return (0);
}
RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
return -1;
}
static int
pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num)
{
FILE *f;
char filename[PATH_MAX];
int ret;
unsigned major, minor;
dev_t dev;
/* get the name of the sysfs file that contains the major and minor
* of the uio device and read its content */
rte_snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path);
f = fopen(filename, "r");
if (f == NULL) {
RTE_LOG(ERR, EAL, "%s(): cannot open sysfs to get major:minor\n",
__func__);
return -1;
}
ret = fscanf(f, "%d:%d", &major, &minor);
if (ret != 2) {
RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs to get major:minor\n",
__func__);
fclose(f);
return -1;
}
fclose(f);
/* create the char device "mknod /dev/uioX c major minor" */
rte_snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
dev = makedev(major, minor);
ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
if (f == NULL) {
RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n",
__func__, strerror(errno));
return -1;
}
return ret;
}
/*
* Return the uioX char device used for a pci device. On success, return
* the UIO number and fill dstbuf string with the path of the device in
* sysfs. On error, return a negative value. In this case dstbuf is
* invalid.
*/
static int
pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
unsigned int buflen)
{
struct rte_pci_addr *loc = &dev->addr;
unsigned int uio_num;
struct dirent *e;
DIR *dir;
char dirname[PATH_MAX];
/* depending on kernel version, uio can be located in uio/uioX
* or uio:uioX */
rte_snprintf(dirname, sizeof(dirname),
SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
loc->domain, loc->bus, loc->devid, loc->function);
dir = opendir(dirname);
if (dir == NULL) {
/* retry with the parent directory */
rte_snprintf(dirname, sizeof(dirname),
SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
loc->domain, loc->bus, loc->devid, loc->function);
dir = opendir(dirname);
if (dir == NULL) {
RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
return -1;
}
}
/* take the first file starting with "uio" */
while ((e = readdir(dir)) != NULL) {
/* format could be uio%d ...*/
int shortprefix_len = sizeof("uio") - 1;
/* ... or uio:uio%d */
int longprefix_len = sizeof("uio:uio") - 1;
char *endptr;
if (strncmp(e->d_name, "uio", 3) != 0)
continue;
/* first try uio%d */
errno = 0;
uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
rte_snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num);
break;
}
/* then try uio:uio%d */
errno = 0;
uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
rte_snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num);
break;
}
}
closedir(dir);
/* No uio resource found */
if (e == NULL)
return -1;
/* create uio device if we've been asked to */
if (internal_config.create_uio_dev && pci_mknod_uio_dev(dstbuf, uio_num) < 0)
RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num);
return uio_num;
}
/* map the PCI resource of a PCI device in virtual memory */
static int
pci_uio_map_resource(struct rte_pci_device *dev)
{
int i, j;
char dirname[PATH_MAX];
char devname[PATH_MAX]; /* contains the /dev/uioX */
void *mapaddr;
int uio_num;
uint64_t phaddr;
uint64_t offset;
uint64_t pagesz;
int nb_maps;
struct rte_pci_addr *loc = &dev->addr;
struct mapped_pci_resource *uio_res;
struct pci_map *maps;
dev->intr_handle.fd = -1;
dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
/* secondary processes - use already recorded details */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
return (pci_uio_map_secondary(dev));
/* find uio resource */
uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname));
if (uio_num < 0) {
RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
"skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
return -1;
}
rte_snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
/* save fd if in primary process */
dev->intr_handle.fd = open(devname, O_RDWR);
if (dev->intr_handle.fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
devname, strerror(errno));
return -1;
}
dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
/* allocate the mapping details for secondary processes*/
if ((uio_res = rte_zmalloc("UIO_RES", sizeof (*uio_res), 0)) == NULL) {
RTE_LOG(ERR, EAL,
"%s(): cannot store uio mmap details\n", __func__);
return (-1);
}
rte_snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
/* collect info about device mappings */
nb_maps = pci_uio_get_mappings(dirname, uio_res->maps,
RTE_DIM(uio_res->maps));
if (nb_maps < 0) {
rte_free(uio_res);
return (nb_maps);
}
uio_res->nb_maps = nb_maps;
/* Map all BARs */
pagesz = sysconf(_SC_PAGESIZE);
maps = uio_res->maps;
for (i = 0; i != PCI_MAX_RESOURCE; i++) {
int fd;
/* skip empty BAR */
if ((phaddr = dev->mem_resource[i].phys_addr) == 0)
continue;
for (j = 0; j != nb_maps && (phaddr != maps[j].phaddr ||
dev->mem_resource[i].len != maps[j].size);
j++)
;
/* if matching map is found, then use it */
if (j != nb_maps) {
offset = j * pagesz;
/*
* open devname, to mmap it
*/
fd = open(devname, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
devname, strerror(errno));
return -1;
}
if (maps[j].addr != NULL ||
(mapaddr = pci_map_resource(NULL, fd,
(off_t)offset,
(size_t)maps[j].size)
) == NULL) {
rte_free(uio_res);
close(fd);
return (-1);
}
close(fd);
maps[j].addr = mapaddr;
maps[j].offset = offset;
dev->mem_resource[i].addr = mapaddr;
}
}
TAILQ_INSERT_TAIL(pci_res_list, uio_res, next);
return (0);
}
/* parse the "resource" sysfs file */
#define IORESOURCE_MEM 0x00000200
@ -546,41 +186,6 @@ error:
return -1;
}
/*
* parse a sysfs file containing one integer value
* different to the eal version, as it needs to work with 64-bit values
*/
static int
pci_parse_sysfs_value(const char *filename, uint64_t *val)
{
FILE *f;
char buf[BUFSIZ];
char *end = NULL;
f = fopen(filename, "r");
if (f == NULL) {
RTE_LOG(ERR, EAL, "%s(): cannot open sysfs value %s\n",
__func__, filename);
return -1;
}
if (fgets(buf, sizeof(buf), f) == NULL) {
RTE_LOG(ERR, EAL, "%s(): cannot read sysfs value %s\n",
__func__, filename);
fclose(f);
return -1;
}
*val = strtoull(buf, &end, 0);
if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs value %s\n",
__func__, filename);
fclose(f);
return -1;
}
fclose(f);
return 0;
}
/* Compare two PCI device addresses. */
static int
pci_addr_comparison(struct rte_pci_addr *addr, struct rte_pci_addr *addr2)

421
lib/librte_eal/linuxapp/eal/eal_pci_uio.c Normal file
View File

@ -0,0 +1,421 @@
/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/stat.h>
#include <rte_log.h>
#include <rte_pci.h>
#include <rte_common.h>
#include <rte_malloc.h>
#include <rte_tailq.h>
#include "rte_pci_dev_ids.h"
#include "eal_filesystem.h"
#include "eal_pci_init.h"
static int pci_parse_sysfs_value(const char *filename, uint64_t *val);
#define OFF_MAX ((uint64_t)(off_t)-1)
static int
pci_uio_get_mappings(const char *devname, struct pci_map maps[], int nb_maps)
{
int i;
char dirname[PATH_MAX];
char filename[PATH_MAX];
uint64_t offset, size;
for (i = 0; i != nb_maps; i++) {
/* check if map directory exists */
rte_snprintf(dirname, sizeof(dirname),
"%s/maps/map%u", devname, i);
if (access(dirname, F_OK) != 0)
break;
/* get mapping offset */
rte_snprintf(filename, sizeof(filename),
"%s/offset", dirname);
if (pci_parse_sysfs_value(filename, &offset) < 0) {
RTE_LOG(ERR, EAL,
"%s(): cannot parse offset of %s\n",
__func__, dirname);
return (-1);
}
/* get mapping size */
rte_snprintf(filename, sizeof(filename),
"%s/size", dirname);
if (pci_parse_sysfs_value(filename, &size) < 0) {
RTE_LOG(ERR, EAL,
"%s(): cannot parse size of %s\n",
__func__, dirname);
return (-1);
}
/* get mapping physical address */
rte_snprintf(filename, sizeof(filename),
"%s/addr", dirname);
if (pci_parse_sysfs_value(filename, &maps[i].phaddr) < 0) {
RTE_LOG(ERR, EAL,
"%s(): cannot parse addr of %s\n",
__func__, dirname);
return (-1);
}
if ((offset > OFF_MAX) || (size > SIZE_MAX)) {
RTE_LOG(ERR, EAL,
"%s(): offset/size exceed system max value\n",
__func__);
return (-1);
}
maps[i].offset = offset;
maps[i].size = size;
}
return (i);
}
static int
pci_uio_map_secondary(struct rte_pci_device *dev)
{
int fd, i;
struct mapped_pci_resource *uio_res;
TAILQ_FOREACH(uio_res, pci_res_list, next) {
/* skip this element if it doesn't match our PCI address */
if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
continue;
for (i = 0; i != uio_res->nb_maps; i++) {
/*
* open devname, to mmap it
*/
fd = open(uio_res->path, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
uio_res->path, strerror(errno));
return -1;
}
if (pci_map_resource(uio_res->maps[i].addr, fd,
(off_t)uio_res->maps[i].offset,
(size_t)uio_res->maps[i].size)
!= uio_res->maps[i].addr) {
RTE_LOG(ERR, EAL,
"Cannot mmap device resource\n");
close(fd);
return (-1);
}
/* fd is not needed in slave process, close it */
close(fd);
}
return (0);
}
RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
return -1;
}
static int
pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num)
{
FILE *f;
char filename[PATH_MAX];
int ret;
unsigned major, minor;
dev_t dev;
/* get the name of the sysfs file that contains the major and minor
* of the uio device and read its content */
rte_snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path);
f = fopen(filename, "r");
if (f == NULL) {
RTE_LOG(ERR, EAL, "%s(): cannot open sysfs to get major:minor\n",
__func__);
return -1;
}
ret = fscanf(f, "%d:%d", &major, &minor);
if (ret != 2) {
RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs to get major:minor\n",
__func__);
fclose(f);
return -1;
}
fclose(f);
/* create the char device "mknod /dev/uioX c major minor" */
rte_snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
dev = makedev(major, minor);
ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
if (f == NULL) {
RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n",
__func__, strerror(errno));
return -1;
}
return ret;
}
/*
* Return the uioX char device used for a pci device. On success, return
* the UIO number and fill dstbuf string with the path of the device in
* sysfs. On error, return a negative value. In this case dstbuf is
* invalid.
*/
static int
pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
unsigned int buflen)
{
struct rte_pci_addr *loc = &dev->addr;
unsigned int uio_num;
struct dirent *e;
DIR *dir;
char dirname[PATH_MAX];
/* depending on kernel version, uio can be located in uio/uioX
* or uio:uioX */
rte_snprintf(dirname, sizeof(dirname),
SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
loc->domain, loc->bus, loc->devid, loc->function);
dir = opendir(dirname);
if (dir == NULL) {
/* retry with the parent directory */
rte_snprintf(dirname, sizeof(dirname),
SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
loc->domain, loc->bus, loc->devid, loc->function);
dir = opendir(dirname);
if (dir == NULL) {
RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
return -1;
}
}
/* take the first file starting with "uio" */
while ((e = readdir(dir)) != NULL) {
/* format could be uio%d ...*/
int shortprefix_len = sizeof("uio") - 1;
/* ... or uio:uio%d */
int longprefix_len = sizeof("uio:uio") - 1;
char *endptr;
if (strncmp(e->d_name, "uio", 3) != 0)
continue;
/* first try uio%d */
errno = 0;
uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
rte_snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num);
break;
}
/* then try uio:uio%d */
errno = 0;
uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
rte_snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num);
break;
}
}
closedir(dir);
/* No uio resource found */
if (e == NULL)
return -1;
/* create uio device if we've been asked to */
if (internal_config.create_uio_dev && pci_mknod_uio_dev(dstbuf, uio_num) < 0)
RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num);
return uio_num;
}
/* map the PCI resource of a PCI device in virtual memory */
int
pci_uio_map_resource(struct rte_pci_device *dev)
{
int i, j;
char dirname[PATH_MAX];
char devname[PATH_MAX]; /* contains the /dev/uioX */
void *mapaddr;
int uio_num;
uint64_t phaddr;
uint64_t offset;
uint64_t pagesz;
int nb_maps;
struct rte_pci_addr *loc = &dev->addr;
struct mapped_pci_resource *uio_res;
struct pci_map *maps;
dev->intr_handle.fd = -1;
dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
/* secondary processes - use already recorded details */
if (rte_eal_process_type() != RTE_PROC_PRIMARY)
return (pci_uio_map_secondary(dev));
/* find uio resource */
uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname));
if (uio_num < 0) {
RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
"skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
return -1;
}
rte_snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
/* save fd if in primary process */
dev->intr_handle.fd = open(devname, O_RDWR);
if (dev->intr_handle.fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
devname, strerror(errno));
return -1;
}
dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
/* allocate the mapping details for secondary processes*/
if ((uio_res = rte_zmalloc("UIO_RES", sizeof (*uio_res), 0)) == NULL) {
RTE_LOG(ERR, EAL,
"%s(): cannot store uio mmap details\n", __func__);
return (-1);
}
rte_snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
/* collect info about device mappings */
nb_maps = pci_uio_get_mappings(dirname, uio_res->maps,
RTE_DIM(uio_res->maps));
if (nb_maps < 0) {
rte_free(uio_res);
return (nb_maps);
}
uio_res->nb_maps = nb_maps;
/* Map all BARs */
pagesz = sysconf(_SC_PAGESIZE);
maps = uio_res->maps;
for (i = 0; i != PCI_MAX_RESOURCE; i++) {
int fd;
/* skip empty BAR */
if ((phaddr = dev->mem_resource[i].phys_addr) == 0)
continue;
for (j = 0; j != nb_maps && (phaddr != maps[j].phaddr ||
dev->mem_resource[i].len != maps[j].size);
j++)
;
/* if matching map is found, then use it */
if (j != nb_maps) {
offset = j * pagesz;
/*
* open devname, to mmap it
*/
fd = open(devname, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
devname, strerror(errno));
return -1;
}
if (maps[j].addr != NULL ||
(mapaddr = pci_map_resource(NULL, fd,
(off_t)offset,
(size_t)maps[j].size)
) == NULL) {
rte_free(uio_res);
close(fd);
return (-1);
}
close(fd);
maps[j].addr = mapaddr;
maps[j].offset = offset;
dev->mem_resource[i].addr = mapaddr;
}
}
TAILQ_INSERT_TAIL(pci_res_list, uio_res, next);
return (0);
}
/*
* parse a sysfs file containing one integer value
* different to the eal version, as it needs to work with 64-bit values
*/
static int
pci_parse_sysfs_value(const char *filename, uint64_t *val)
{
FILE *f;
char buf[BUFSIZ];
char *end = NULL;
f = fopen(filename, "r");
if (f == NULL) {
RTE_LOG(ERR, EAL, "%s(): cannot open sysfs value %s\n",
__func__, filename);
return -1;
}
if (fgets(buf, sizeof(buf), f) == NULL) {
RTE_LOG(ERR, EAL, "%s(): cannot read sysfs value %s\n",
__func__, filename);
fclose(f);
return -1;
}
*val = strtoull(buf, &end, 0);
if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs value %s\n",
__func__, filename);
fclose(f);
return -1;
}
fclose(f);
return 0;
}

66
lib/librte_eal/linuxapp/eal/include/eal_pci_init.h Normal file
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@ -0,0 +1,66 @@
/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef EAL_PCI_INIT_H_
#define EAL_PCI_INIT_H_
struct pci_map {
void *addr;
uint64_t offset;
uint64_t size;
uint64_t phaddr;
};
/*
* For multi-process we need to reproduce all PCI mappings in secondary
* processes, so save them in a tailq.
*/
struct mapped_pci_resource {
TAILQ_ENTRY(mapped_pci_resource) next;
struct rte_pci_addr pci_addr;
char path[PATH_MAX];
int nb_maps;
struct pci_map maps[PCI_MAX_RESOURCE];
};
TAILQ_HEAD(mapped_pci_res_list, mapped_pci_resource);
extern struct mapped_pci_res_list *pci_res_list;
void * pci_map_resource(void * requested_addr, int fd, off_t offset,
size_t size);
/* map IGB_UIO resource prototype */
int pci_uio_map_resource(struct rte_pci_device *dev);
#endif /* EAL_PCI_INIT_H_ */