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utags: read utag block device path in bootconfig from device tree

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GKI2.0 doens't allow to export kernel_read and kernel_write api,
so we get the block device path in bootconfig from device tree.

Change-Id: I8601a35f88344eb5ba7601fc302eb1b846e945a0
Signed-off-by: qianlong <qianl2@motorola.com>
Reviewed-on: https://gerrit.mot.com/2072437
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Zhenxin Xi <xizx@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
qianlong 2021-09-22 11:07:54 +08:00 • committed by qianl2
commit 6180117a2e
1 changed files with 10 additions and 103 deletions
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113
drivers/misc/utag/utags.c
View file

@ -1939,7 +1939,7 @@ stop_building_utags:
#ifdef CONFIG_OF
static char *bootargs_str;
static int utag_get_bootarg(char *key, char **value)
static int utag_get_bootarg(char *key, char **value, char *prop, char *spl_flag)
{
const char *bootargs_ptr = NULL;
char *idx = NULL;
@ -1951,7 +1951,7 @@ static int utag_get_bootarg(char *key, char **value)
if (n == NULL)
goto err;
if (of_property_read_string(n, "bootargs", &bootargs_ptr) != 0)
if (of_property_read_string(n, prop, &bootargs_ptr) != 0)
goto err_putnode;
bootargs_ptr_len = strlen(bootargs_ptr);
@ -1968,7 +1968,7 @@ static int utag_get_bootarg(char *key, char **value)
kvpair = strsep(&idx, " ");
if (kvpair)
if (strsep(&kvpair, "=")) {
*value = strsep(&kvpair, " ");
*value = strsep(&kvpair, spl_flag);
if (*value)
err = 0;
}
@ -1981,100 +1981,7 @@ 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;
loff_t pos = 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(filep, (void *) xbc_buf, XBC_DATA_MAX, &pos);
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;
@ -2085,10 +1992,11 @@ static int utags_get_bootdevice_from_bootconfig(char **bootconfig_val)
return 0;
}
rc = utags_read_bootconfig("androidboot.bootdevice = \"", bootconfig_val);
if (!rc && *bootconfig_val)
rc = utag_get_bootarg("androidboot.bootdevice=", bootconfig_val, "mmi,bootconfig", "\n");
if (!rc && *bootconfig_val) {
strncpy(bootdevice_name, *bootconfig_val, strlen(*bootconfig_val));
bootdevice_init = 1;
}
return rc;
}
#endif
@ -2103,15 +2011,14 @@ static void utags_bootdevice_expand(const char **name_ptr, const char *name)
char *replace, *suffix, *expanded;
#ifndef CONFIG_BOOT_CONFIG
rc = utag_get_bootarg("androidboot.bootdevice=", &bootdevice);
rc = utag_get_bootarg("androidboot.bootdevice=", &bootdevice, "bootargs", " ");
if (rc || !bootdevice)
goto need_no_expansion;
#else
if (utag_haskey_bootarg("bootconfig"))
rc = utags_get_bootdevice_from_bootconfig(&bootdevice);
rc = utags_get_bootdevice_from_bootconfig(&bootdevice);
if (rc || !bootdevice) {
rc = utag_get_bootarg("androidboot.bootdevice=", &bootdevice);
rc = utag_get_bootarg("androidboot.bootdevice=", &bootdevice, "bootargs", " ");
if (rc || !bootdevice)
goto need_no_expansion;
}