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Do not access ext_csd register in debugfs from storaged

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Starting from Android R, platform code cannot access files in debugfs
since it does not guarantee ABI stability. This CL removes the code in
storaged that accesses the EMMC's ext_csd register from debugfs as a
backup if it is unable to obtain the information from Health HAL.

Test: build and boot.
Bug: 134669095
Change-Id: I3bfeb3963de5fb5e6bb3eaa9df43baacad164816
This commit is contained in:
Hridya Valsaraju 2019-08-16 14:00:04 -07:00
parent c1c6008b78
commit dbac204e8b
1 changed files with 3 additions and 55 deletions
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58
storaged/storaged_info.cpp
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@ -41,7 +41,6 @@ using android::hardware::health::V2_0::Result;
using android::hardware::health::V2_0::StorageInfo;
const string emmc_info_t::emmc_sysfs = "/sys/bus/mmc/devices/mmc0:0001/";
const string emmc_info_t::emmc_debugfs = "/d/mmc0/mmc0:0001/ext_csd";
const char* emmc_info_t::emmc_ver_str[9] = {
"4.0", "4.1", "4.2", "4.3", "Obsolete", "4.41", "4.5", "5.0", "5.1"
};
@ -62,10 +61,8 @@ storage_info_t* storage_info_t::get_storage_info(const sp<IHealth>& healthServic
if (healthService != nullptr) {
return new health_storage_info_t(healthService);
}
if (FileExists(emmc_info_t::emmc_sysfs) ||
FileExists(emmc_info_t::emmc_debugfs)) {
return new emmc_info_t;
}
if (FileExists(emmc_info_t::emmc_sysfs)) return new emmc_info_t;
if (FileExists(ufs_info_t::health_file)) {
return new ufs_info_t;
}
@ -241,8 +238,7 @@ uint32_t storage_info_t::get_recent_perf() {
void emmc_info_t::report()
{
if (!report_sysfs() && !report_debugfs())
return;
if (!report_sysfs()) return;
publish();
}
@ -284,54 +280,6 @@ bool emmc_info_t::report_sysfs()
return true;
}
namespace {
const size_t EXT_CSD_FILE_MIN_SIZE = 1024;
/* 2 characters in string for each byte */
const size_t EXT_CSD_REV_IDX = 192 * 2;
const size_t EXT_PRE_EOL_INFO_IDX = 267 * 2;
const size_t EXT_DEVICE_LIFE_TIME_EST_A_IDX = 268 * 2;
const size_t EXT_DEVICE_LIFE_TIME_EST_B_IDX = 269 * 2;
} // namespace
bool emmc_info_t::report_debugfs()
{
string buffer;
uint16_t rev = 0;
if (!ReadFileToString(emmc_debugfs, &buffer) ||
buffer.length() < (size_t)EXT_CSD_FILE_MIN_SIZE) {
return false;
}
string str = buffer.substr(EXT_CSD_REV_IDX, 2);
if (!ParseUint(str, &rev) ||
rev < 7 || rev > ARRAY_SIZE(emmc_ver_str)) {
return false;
}
version = "emmc ";
version += emmc_ver_str[rev];
str = buffer.substr(EXT_PRE_EOL_INFO_IDX, 2);
if (!ParseUint(str, &eol)) {
return false;
}
str = buffer.substr(EXT_DEVICE_LIFE_TIME_EST_A_IDX, 2);
if (!ParseUint(str, &lifetime_a)) {
return false;
}
str = buffer.substr(EXT_DEVICE_LIFE_TIME_EST_B_IDX, 2);
if (!ParseUint(str, &lifetime_b)) {
return false;
}
return true;
}
void ufs_info_t::report()
{
string buffer;