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utags: reads bootdevice name from bootconfig

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After 8450 rebased to qcom FC, the bootconfig feature begins enable.
So that androidboot.bootdevice cannot be found in the cmdline,
and cause utags module to load failure.

When bootdevice cannot be found in the cmdline, fallback to read
it from /proc/bootconfig file.

Change-Id: I4324fcbc0345b246308bae95af03e0d99eaff399
Signed-off-by: xizx <xizx@motorola.com>
Reviewed-on: https://gerrit.mot.com/2008778
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Guobin Zhang <zhanggb@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
xizx 2021-07-11 12:47:50 +08:00 • committed by Zhenxin Xi
commit 40ea1a04ff
1 changed files with 124 additions and 1 deletions
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125
drivers/misc/utag/utags.c
View file

@ -1885,18 +1885,141 @@ err:
return err;
}
#ifdef CONFIG_BOOT_CONFIG
static int utag_haskey_bootarg(char *key)
{
const char *bootargs_ptr = NULL;
char *idx = NULL;
int err = 0;
struct device_node *n = of_find_node_by_path("/chosen");
size_t bootargs_ptr_len = 0;
if (n == NULL)
goto err;
if (of_property_read_string(n, "bootargs", &bootargs_ptr) != 0)
goto err_putnode;
bootargs_ptr_len = strlen(bootargs_ptr);
if (!bootargs_str) {
/* Following operations need a non-const version of bootargs */
bootargs_str = kzalloc(bootargs_ptr_len + 1, GFP_KERNEL);
if (!bootargs_str)
goto err_putnode;
}
strlcpy(bootargs_str, bootargs_ptr, bootargs_ptr_len + 1);
idx = strnstr(bootargs_str, key, strlen(bootargs_str));
if (idx)
err = 1;
err_putnode:
of_node_put(n);
err:
return err;
}
#include <linux/bootconfig.h>
#define BOOTCONFIG_FULLPATH "/proc/bootconfig"
static char bootdevice_name[256];
static int utags_read_bootconfig(const char *bootconfig_key, char **bootconfig_val)
{
struct file *filep = NULL;
char *xbc_buf = NULL;
int bytes = 0;
char *start_bootdevice = NULL;
int rc = 0;
filep = filp_open(BOOTCONFIG_FULLPATH, O_RDONLY, 0600);
if (IS_ERR_OR_NULL(filep)) {
rc = PTR_ERR(filep);
pr_err("opening (%s) errno=%d\n", BOOTCONFIG_FULLPATH, rc);
return rc;
}
xbc_buf = kzalloc(XBC_DATA_MAX, GFP_KERNEL);
if (!xbc_buf) {
pr_err("alloc len %d memory fail\n", XBC_DATA_MAX);
filp_close(filep, NULL);
return -ENOMEM;
}
bytes = kernel_read_stub(filep, (void *) xbc_buf, XBC_DATA_MAX);
pr_debug("read bootconfig bytes %d\n", bytes);
if (bytes <= 0) {
pr_err("fail read bytes %d\n", bytes);
kfree(xbc_buf);
filp_close(filep, NULL);
return -EIO;
}
start_bootdevice = strstr(xbc_buf, bootconfig_key);
if (start_bootdevice) {
char *p = start_bootdevice + strlen(bootconfig_key);
int i = 0;
memset(bootdevice_name, 0, sizeof(bootdevice_name));
while (p && *p && (*p != '\n') && (*p != '"')
&& (i < sizeof(bootdevice_name))) {
bootdevice_name[i] = *p;
i++;
p++;
}
*bootconfig_val = bootdevice_name;
pr_info("bootconfig key %s%s\"\n", bootconfig_key, *bootconfig_val);
} else {
pr_err("cannot find key %s\n", bootconfig_key);
rc = -ENOENT;
}
kfree(xbc_buf);
filp_close(filep, NULL);
return rc;
}
static int utags_get_bootdevice_from_bootconfig(char **bootconfig_val)
{
static char bootdevice_init = 0;
int rc = 0;
if (bootdevice_init) {
*bootconfig_val = bootdevice_name;
return 0;
}
rc = utags_read_bootconfig("androidboot.bootdevice = \"", bootconfig_val);
if (!rc && *bootconfig_val)
bootdevice_init = 1;
return rc;
}
#endif
#define PLATFORM_PATH "/dev/block/platform/soc/"
static void utags_bootdevice_expand(const char **name_ptr, const char *name)
{
int rc;
int rc = -1;
size_t max_len = strlen(name);
char *bootdevice = NULL;
char *replace, *suffix, *expanded;
#ifndef CONFIG_BOOT_CONFIG
rc = utag_get_bootarg("androidboot.bootdevice=", &bootdevice);
if (rc || !bootdevice)
goto need_no_expansion;
#else
if (utag_haskey_bootarg("bootconfig"))
rc = utags_get_bootdevice_from_bootconfig(&bootdevice);
if (rc || !bootdevice) {
rc = utag_get_bootarg("androidboot.bootdevice=", &bootdevice);
if (rc || !bootdevice)
goto need_no_expansion;
}
#endif
replace = strnstr(name, "bootdevice", max_len);
suffix = strnstr(name, "by-name", max_len);