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/*
* Intel(R) Matrix Storage Manager hardware and firmware support routines
*
* Copyright (C) 2008 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "mdadm.h"
#include "platform-intel.h"
#include "probe_roms.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
void free_sys_dev(struct sys_dev **list)
{
while (*list) {
struct sys_dev *next = (*list)->next;
if ((*list)->path)
free((*list)->path);
free(*list);
*list = next;
}
}
struct sys_dev *find_driver_devices(const char *bus, const char *driver)
{
/* search sysfs for devices driven by 'driver' */
char path[256];
char link[256];
char *c;
DIR *driver_dir;
struct dirent *de;
struct sys_dev *head = NULL;
struct sys_dev *list = NULL;
sprintf(path, "/sys/bus/%s/drivers/%s", bus, driver);
driver_dir = opendir(path);
if (!driver_dir)
return NULL;
for (de = readdir(driver_dir); de; de = readdir(driver_dir)) {
/* is 'de' a device? check that the 'subsystem' link exists and
* that its target matches 'bus'
*/
sprintf(path, "/sys/bus/%s/drivers/%s/%s/subsystem",
bus, driver, de->d_name);
if (readlink(path, link, sizeof(link)) < 0)
continue;
c = strrchr(link, '/');
if (!c)
continue;
if (strncmp(bus, c+1, strlen(bus)) != 0)
continue;
/* start / add list entry */
if (!head) {
head = malloc(sizeof(*head));
list = head;
} else {
list->next = malloc(sizeof(*head));
list = list->next;
}
if (!list) {
free_sys_dev(&head);
break;
}
/* generate canonical path name for the device */
sprintf(path, "/sys/bus/%s/drivers/%s/%s",
bus, driver, de->d_name);
list->path = canonicalize_file_name(path);
list->next = NULL;
}
return head;
}
__u16 devpath_to_vendor(const char *dev_path)
{
char path[strlen(dev_path) + strlen("/vendor") + 1];
char vendor[7];
int fd;
__u16 id = 0xffff;
int n;
sprintf(path, "%s/vendor", dev_path);
fd = open(path, O_RDONLY);
if (fd < 0)
return 0xffff;
n = read(fd, vendor, sizeof(vendor));
if (n == sizeof(vendor)) {
vendor[n - 1] = '\0';
id = strtoul(vendor, NULL, 16);
}
close(fd);
return id;
}
static int platform_has_intel_ahci(void)
{
struct sys_dev *devices = find_driver_devices("pci", "ahci");
struct sys_dev *dev;
int ret = 0;
for (dev = devices; dev; dev = dev->next)
if (devpath_to_vendor(dev->path) == 0x8086) {
ret = 1;
break;
}
free_sys_dev(&devices);
return ret;
}
static struct imsm_orom imsm_orom;
static int scan(const void *start, const void *end)
{
int offset;
const struct imsm_orom *imsm_mem;
int len = (end - start);
for (offset = 0; offset < len; offset += 4) {
imsm_mem = start + offset;
if (memcmp(imsm_mem->signature, "$VER", 4) == 0) {
imsm_orom = *imsm_mem;
return 1;
}
}
return 0;
}
const struct imsm_orom *find_imsm_orom(void)
{
static int populated = 0;
/* it's static data so we only need to read it once */
if (populated)
return &imsm_orom;
if (!platform_has_intel_ahci())
return NULL;
/* scan option-rom memory looking for an imsm signature */
if (probe_roms_init() != 0)
return NULL;
probe_roms();
populated = scan_adapter_roms(scan);
probe_roms_exit();
if (populated)
return &imsm_orom;
return NULL;
}
char *devt_to_devpath(dev_t dev)
{
char device[40];
sprintf(device, "/sys/dev/block/%d:%d/device", major(dev), minor(dev));
return canonicalize_file_name(device);
}
static char *diskfd_to_devpath(int fd)
{
/* return the device path for a disk, return NULL on error or fd
* refers to a partition
*/
struct stat st;
if (fstat(fd, &st) != 0)
return NULL;
if (!S_ISBLK(st.st_mode))
return NULL;
return devt_to_devpath(st.st_rdev);
}
int path_attached_to_hba(const char *disk_path, const char *hba_path)
{
int rc;
if (!disk_path || !hba_path)
return 0;
if (strncmp(disk_path, hba_path, strlen(hba_path)) == 0)
rc = 1;
else
rc = 0;
return rc;
}
int devt_attached_to_hba(dev_t dev, const char *hba_path)
{
char *disk_path = devt_to_devpath(dev);
int rc = path_attached_to_hba(disk_path, hba_path);
if (disk_path)
free(disk_path);
return rc;
}
int disk_attached_to_hba(int fd, const char *hba_path)
{
char *disk_path = diskfd_to_devpath(fd);
int rc = path_attached_to_hba(disk_path, hba_path);
if (disk_path)
free(disk_path);
return rc;
}
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