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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 Advanced Micro Devices, Inc. All rights reserved.
*/
#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <rte_string_fns.h>
#include "ccp_pci.h"
static const char * const uio_module_names[] = {
"igb_uio",
"uio_pci_generic",
};
int
ccp_check_pci_uio_module(void)
{
FILE *fp;
int i;
char buf[BUFSIZ];
fp = fopen(PROC_MODULES, "r");
if (fp == NULL)
return -1;
i = 0;
while (uio_module_names[i] != NULL) {
while (fgets(buf, sizeof(buf), fp) != NULL) {
if (!strncmp(buf, uio_module_names[i],
strlen(uio_module_names[i]))) {
fclose(fp);
return i;
}
}
i++;
rewind(fp);
}
fclose(fp);
printf("Insert igb_uio or uio_pci_generic kernel module(s)");
return -1;/* uio not inserted */
}
/*
* split up a pci address into its constituent parts.
*/
int
ccp_parse_pci_addr_format(const char *buf, int bufsize, uint16_t *domain,
uint8_t *bus, uint8_t *devid, uint8_t *function)
{
/* first split on ':' */
union splitaddr {
struct {
char *domain;
char *bus;
char *devid;
char *function;
};
char *str[PCI_FMT_NVAL];
/* last element-separator is "." not ":" */
} splitaddr;
char *buf_copy = strndup(buf, bufsize);
if (buf_copy == NULL)
return -1;
if (rte_strsplit(buf_copy, bufsize, splitaddr.str, PCI_FMT_NVAL, ':')
!= PCI_FMT_NVAL - 1)
goto error;
/* final split is on '.' between devid and function */
splitaddr.function = strchr(splitaddr.devid, '.');
if (splitaddr.function == NULL)
goto error;
*splitaddr.function++ = '\0';
/* now convert to int values */
errno = 0;
*domain = (uint8_t)strtoul(splitaddr.domain, NULL, 16);
*bus = (uint8_t)strtoul(splitaddr.bus, NULL, 16);
*devid = (uint8_t)strtoul(splitaddr.devid, NULL, 16);
*function = (uint8_t)strtoul(splitaddr.function, NULL, 10);
if (errno != 0)
goto error;
free(buf_copy); /* free the copy made with strdup */
return 0;
error:
free(buf_copy);
return -1;
}
int
ccp_pci_parse_sysfs_value(const char *filename, unsigned long *val)
{
FILE *f;
char buf[BUFSIZ];
char *end = NULL;
f = fopen(filename, "r");
if (f == NULL)
return -1;
if (fgets(buf, sizeof(buf), f) == NULL) {
fclose(f);
return -1;
}
*val = strtoul(buf, &end, 0);
if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
fclose(f);
return -1;
}
fclose(f);
return 0;
}
/** IO resource type: */
#define IORESOURCE_IO 0x00000100
#define IORESOURCE_MEM 0x00000200
/* parse one line of the "resource" sysfs file (note that the 'line'
* string is modified)
*/
static int
ccp_pci_parse_one_sysfs_resource(char *line, size_t len, uint64_t *phys_addr,
uint64_t *end_addr, uint64_t *flags)
{
union pci_resource_info {
struct {
char *phys_addr;
char *end_addr;
char *flags;
};
char *ptrs[PCI_RESOURCE_FMT_NVAL];
} res_info;
if (rte_strsplit(line, len, res_info.ptrs, 3, ' ') != 3)
return -1;
errno = 0;
*phys_addr = strtoull(res_info.phys_addr, NULL, 16);
*end_addr = strtoull(res_info.end_addr, NULL, 16);
*flags = strtoull(res_info.flags, NULL, 16);
if (errno != 0)
return -1;
return 0;
}
/* parse the "resource" sysfs file */
int
ccp_pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)
{
FILE *fp;
char buf[BUFSIZ];
int i;
uint64_t phys_addr, end_addr, flags;
fp = fopen(filename, "r");
if (fp == NULL)
return -1;
for (i = 0; i < PCI_MAX_RESOURCE; i++) {
if (fgets(buf, sizeof(buf), fp) == NULL)
goto error;
if (ccp_pci_parse_one_sysfs_resource(buf, sizeof(buf),
&phys_addr, &end_addr, &flags) < 0)
goto error;
if (flags & IORESOURCE_MEM) {
dev->mem_resource[i].phys_addr = phys_addr;
dev->mem_resource[i].len = end_addr - phys_addr + 1;
/* not mapped for now */
dev->mem_resource[i].addr = NULL;
}
}
fclose(fp);
return 0;
error:
fclose(fp);
return -1;
}
int
ccp_find_uio_devname(const char *dirname)
{
DIR *dir;
struct dirent *e;
char dirname_uio[PATH_MAX];
unsigned int uio_num;
int ret = -1;
/* depending on kernel version, uio can be located in uio/uioX
* or uio:uioX
*/
snprintf(dirname_uio, sizeof(dirname_uio), "%s/uio", dirname);
dir = opendir(dirname_uio);
if (dir == NULL) {
/* retry with the parent directory might be different kernel version*/
dir = opendir(dirname);
if (dir == NULL)
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)) {
ret = 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)) {
ret = uio_num;
break;
}
}
closedir(dir);
return ret;
}
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