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Diffstat (limited to 'interfaces/boot/1.0/BootControl.cpp')
-rw-r--r-- | interfaces/boot/1.0/BootControl.cpp | 272 |
1 files changed, 0 insertions, 272 deletions
diff --git a/interfaces/boot/1.0/BootControl.cpp b/interfaces/boot/1.0/BootControl.cpp deleted file mode 100644 index 1f155c9..0000000 --- a/interfaces/boot/1.0/BootControl.cpp +++ /dev/null @@ -1,272 +0,0 @@ -/* - * Copyright (C) 2019 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#define LOG_TAG "bootcontrolhal" - -#include "BootControl.h" -#include "GptUtils.h" - -#include <android-base/file.h> -#include <cutils/properties.h> -#include <log/log.h> - -namespace android { -namespace hardware { -namespace boot { -namespace V1_0 { -namespace implementation { - -namespace { - -#define BOOT_A_PATH "/dev/block/by-name/boot_a" -#define BOOT_B_PATH "/dev/block/by-name/boot_b" - -// slot flags -#define AB_ATTR_PRIORITY_SHIFT 52 -#define AB_ATTR_PRIORITY_MASK (3UL << AB_ATTR_PRIORITY_SHIFT) -#define AB_ATTR_ACTIVE_SHIFT 54 -#define AB_ATTR_ACTIVE (1UL << AB_ATTR_ACTIVE_SHIFT) -#define AB_ATTR_RETRY_COUNT_SHIFT (55) -#define AB_ATTR_RETRY_COUNT_MASK (7UL << AB_ATTR_RETRY_COUNT_SHIFT) -#define AB_ATTR_SUCCESSFUL (1UL << 58) -#define AB_ATTR_UNBOOTABLE (1UL << 59) - -#define AB_ATTR_MAX_PRIORITY 3UL -#define AB_ATTR_MAX_RETRY_COUNT 3UL - -static std::string getDevPath(uint32_t slot) { - char real_path[PATH_MAX]; - - const char *path = slot == 0 ? BOOT_A_PATH : BOOT_B_PATH; - - int ret = readlink(path, real_path, sizeof real_path); - if (ret < 0) { - ALOGE("readlink failed for boot device %s\n", strerror(errno)); - return std::string(); - } - - std::string dp(real_path); - // extract /dev/sda.. part - return dp.substr(0, sizeof "/dev/block/sdX" - 1); -} - -static bool isSlotFlagSet(uint32_t slot, uint64_t flag) { - std::string dev_path = getDevPath(slot); - if (dev_path.empty()) { - ALOGI("Could not get device path for slot %d\n", slot); - return false; - } - - GptUtils gpt(dev_path); - if (gpt.Load()) { - ALOGI("failed to load gpt data\n"); - return false; - } - - gpt_entry *e = gpt.GetPartitionEntry(slot ? "boot_b" : "boot_a"); - if (e == nullptr) { - ALOGI("failed to get gpt entry\n"); - return false; - } - - return !!(e->attr & flag); -} - -static int setSlotFlag(uint32_t slot, uint64_t flag) { - std::string dev_path = getDevPath(slot); - if (dev_path.empty()) { - ALOGI("Could not get device path for slot %d\n", slot); - return -1; - } - - GptUtils gpt(dev_path); - if (gpt.Load()) { - ALOGI("failed to load gpt data\n"); - return -1; - } - - gpt_entry *e = gpt.GetPartitionEntry(slot ? "boot_b" : "boot_a"); - if (e == nullptr) { - ALOGI("failed to get gpt entry\n"); - return -1; - } - - e->attr |= flag; - gpt.Sync(); - - return 0; -} - -} - -// Methods from ::android::hardware::boot::V1_0::IBootControl follow. -Return<uint32_t> BootControl::getNumberSlots() { - uint32_t slots = 0; - - if (access(BOOT_A_PATH, F_OK) == 0) - slots++; - - if (access(BOOT_B_PATH, F_OK) == 0) - slots++; - - return slots; -} - -Return<uint32_t> BootControl::getCurrentSlot() { - char suffix[PROPERTY_VALUE_MAX]; - property_get("ro.boot.slot_suffix", suffix, "_a"); - return std::string(suffix) == "_b" ? 1 : 0; -} - -Return<void> BootControl::markBootSuccessful(markBootSuccessful_cb _hidl_cb) { - if (getNumberSlots() == 0) { - // no slots, just return true otherwise Android keeps trying - _hidl_cb({true, ""}); - return Void(); - } - int ret = setSlotFlag(getCurrentSlot(), AB_ATTR_SUCCESSFUL); - ret ? _hidl_cb({false, "Failed to set successfull flag"}) : _hidl_cb({true, ""}); - return Void(); -} - -Return<void> BootControl::setActiveBootSlot(uint32_t slot, setActiveBootSlot_cb _hidl_cb) { - if (slot >= 2) { - _hidl_cb({false, "Invalid slot"}); - return Void(); - } - - std::string dev_path = getDevPath(slot); - if (dev_path.empty()) { - _hidl_cb({false, "Could not get device path for slot"}); - return Void(); - } - - GptUtils gpt(dev_path); - if (gpt.Load()) { - _hidl_cb({false, "failed to load gpt data"}); - return Void(); - } - - gpt_entry *active_entry = gpt.GetPartitionEntry(slot == 0 ? "boot_a" : "boot_b"); - gpt_entry *inactive_entry = gpt.GetPartitionEntry(slot == 0 ? "boot_b" : "boot_a"); - if (active_entry == nullptr || inactive_entry == nullptr) { - _hidl_cb({false, "failed to get entries for boot partitions"}); - return Void(); - } - - ALOGV("slot active attributes %lx\n", active_entry->attr); - ALOGV("slot inactive attributes %lx\n", inactive_entry->attr); - - char boot_dev[PROPERTY_VALUE_MAX]; - property_get("ro.boot.bootdevice", boot_dev, ""); - if (boot_dev[0] == '\0') { - _hidl_cb({false, "invalid ro.boot.bootdevice prop"}); - return Void(); - } - - std::string boot_lun_path = std::string("/sys/devices/platform/") + - boot_dev + "/pixel/boot_lun_enabled"; - int fd = open(boot_lun_path.c_str(), O_RDWR); - if (fd < 0) { - // Try old path for kernels < 5.4 - // TODO: remove once kernel 4.19 support is deprecated - std::string boot_lun_path = std::string("/sys/devices/platform/") + - boot_dev + "/attributes/boot_lun_enabled"; - fd = open(boot_lun_path.c_str(), O_RDWR); - if (fd < 0) { - _hidl_cb({false, "failed to open ufs attr boot_lun_enabled"}); - return Void(); - } - } - - // update attributes for active and inactive - inactive_entry->attr &= ~AB_ATTR_ACTIVE; - active_entry->attr = AB_ATTR_ACTIVE | (AB_ATTR_MAX_PRIORITY << AB_ATTR_PRIORITY_SHIFT) | - (AB_ATTR_MAX_RETRY_COUNT << AB_ATTR_RETRY_COUNT_SHIFT); - - // - // bBootLunEn - // 0x1 => Boot LU A = enabled, Boot LU B = disable - // 0x2 => Boot LU A = disable, Boot LU B = enabled - // - int ret = android::base::WriteStringToFd(slot == 0 ? "1" : "2", fd); - close(fd); - if (ret < 0) { - _hidl_cb({false, "faied to write boot_lun_enabled attribute"}); - return Void(); - } - - _hidl_cb({true, ""}); - return Void(); -} - -Return<void> BootControl::setSlotAsUnbootable(uint32_t slot, setSlotAsUnbootable_cb _hidl_cb) { - if (slot >= 2) { - _hidl_cb({false, "Invalid slot"}); - return Void(); - } - - std::string dev_path = getDevPath(slot); - if (dev_path.empty()) { - _hidl_cb({false, "Could not get device path for slot"}); - return Void(); - } - - GptUtils gpt(dev_path); - gpt.Load(); - - gpt_entry *e = gpt.GetPartitionEntry(slot ? "boot_b" : "boot_a"); - e->attr |= AB_ATTR_UNBOOTABLE; - - gpt.Sync(); - - _hidl_cb({true, ""}); - return Void(); -} - -Return<::android::hardware::boot::V1_0::BoolResult> BootControl::isSlotBootable(uint32_t slot) { - if (getNumberSlots() == 0) - return BoolResult::FALSE; - if (slot >= getNumberSlots()) - return BoolResult::INVALID_SLOT; - return isSlotFlagSet(slot, AB_ATTR_UNBOOTABLE) ? BoolResult::FALSE : BoolResult::TRUE; -} - -Return<::android::hardware::boot::V1_0::BoolResult> BootControl::isSlotMarkedSuccessful(uint32_t slot) { - if (getNumberSlots() == 0) { - // just return true so that we don't we another call trying to mark it as successful - // when there is no slots - return BoolResult::TRUE; - } - if (slot >= getNumberSlots()) - return BoolResult::INVALID_SLOT; - return isSlotFlagSet(slot, AB_ATTR_SUCCESSFUL) ? BoolResult::TRUE : BoolResult::FALSE; -} - -Return<void> BootControl::getSuffix(uint32_t slot, getSuffix_cb _hidl_cb) { - _hidl_cb(slot == 0 ? "_a" : slot == 1 ? "_b" : ""); - return Void(); -} - -extern "C" IBootControl* HIDL_FETCH_IBootControl(const char*) { - return new BootControl(); -} - -} // namespace implementation -} // namespace V1_0 -} // namespace boot -} // namespace hardware -} // namespace android |