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FROMGIT: binder: BINDER_GET_FROZEN_INFO ioctl

Browse source 
User space needs to know if binder transactions occurred to frozen
processes. Introduce a new BINDER_GET_FROZEN ioctl and keep track of
transactions occurring to frozen proceses.

Bug: 180989544
(cherry picked from commit c55019c24b22d6770bd8e2f12fbddf3f83d37547
 git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-testing)
Signed-off-by: Marco Ballesio <balejs@google.com>
Signed-off-by: Li Li <dualli@google.com>
Acked-by: Todd Kjos <tkjos@google.com>
Link: https://lore.kernel.org/r/20210316011630.1121213-4-dualli@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Change-Id: If2fb07bc002940d27ec9ec060504940a71c654e4
Reviewed-on: https://gerrit.mot.com/2119046
Reviewed-by: Vijayakumar Gn <vijaygn@motorola.com>
Reviewed-by: Ling Jin <lingjin@motorola.com>
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Submit-Approved: Jira Key
Signed-off-by: Murilo Alves <alvesm@motorola.com>
Reviewed-on: https://gerrit.mot.com/2132252
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Reviewed-on: https://gerrit.mot.com/2161796
Reviewed-by: Zhangqing Huang <huangzq2@motorola.com>
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Reviewed-on: https://gerrit.mot.com/2325561
Reviewed-by: Yonghui Jia <jiayh2@motorola.com>
Reviewed-by: Hongshu Lou <louhs1@motorola.com>
This commit is contained in:
Marco Ballesio 2021-11-17 14:35:07 +05:30 • committed by Xiaojun Ji
commit e816fb5085
3 changed files with 70 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

76
drivers/android/binder.c
View file

@ -201,25 +201,8 @@ static struct binder_transaction_log_entry *binder_transaction_log_add(
}
enum binder_deferred_state {
BINDER_DEFERRED_PUT_FILES = 0x01,
BINDER_DEFERRED_FLUSH = 0x02,
BINDER_DEFERRED_RELEASE = 0x04,
};
/**
* struct binder_priority - scheduler policy and priority
* @sched_policy scheduler policy
* @prio [100..139] for SCHED_NORMAL, [0..99] for FIFO/RT
*
* The binder driver supports inheriting the following scheduler policies:
* SCHED_NORMAL
* SCHED_BATCH
* SCHED_FIFO
* SCHED_RR
*/
struct binder_priority {
unsigned int sched_policy;
int prio;
BINDER_DEFERRED_FLUSH = 0x01,
BINDER_DEFERRED_RELEASE = 0x02,
};
enum {
@ -2858,6 +2841,10 @@ static int binder_proc_transaction(struct binder_transaction *t,
}
binder_inner_proc_lock(proc);
if (proc->is_frozen) {
proc->sync_recv |= !oneway;
proc->async_recv |= oneway;
}
if ((proc->is_frozen && !oneway) || proc->is_dead ||
(thread && thread->is_dead)) {
@ -5213,6 +5200,8 @@ static int binder_ioctl_freeze(struct binder_freeze_info *info,
if (!info->enable) {
binder_inner_proc_lock(target_proc);
target_proc->sync_recv = false;
target_proc->async_recv = false;
target_proc->is_frozen = false;
binder_inner_proc_unlock(target_proc);
return 0;
@ -5224,6 +5213,8 @@ static int binder_ioctl_freeze(struct binder_freeze_info *info,
* for transactions to drain.
*/
binder_inner_proc_lock(target_proc);
target_proc->sync_recv = false;
target_proc->async_recv = false;
target_proc->is_frozen = true;
binder_inner_proc_unlock(target_proc);
@ -5245,6 +5236,33 @@ static int binder_ioctl_freeze(struct binder_freeze_info *info,
return ret;
}
static int binder_ioctl_get_freezer_info(
struct binder_frozen_status_info *info)
{
struct binder_proc *target_proc;
bool found = false;
info->sync_recv = 0;
info->async_recv = 0;
mutex_lock(&binder_procs_lock);
hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
if (target_proc->pid == info->pid) {
found = true;
binder_inner_proc_lock(target_proc);
info->sync_recv |= target_proc->sync_recv;
info->async_recv |= target_proc->async_recv;
binder_inner_proc_unlock(target_proc);
}
}
mutex_unlock(&binder_procs_lock);
if (!found)
return -EINVAL;
return 0;
}
static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int ret;
@ -5423,6 +5441,24 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
goto err;
break;
}
case BINDER_GET_FROZEN_INFO: {
struct binder_frozen_status_info info;
if (copy_from_user(&info, ubuf, sizeof(info))) {
ret = -EFAULT;
goto err;
}
ret = binder_ioctl_get_freezer_info(&info);
if (ret < 0)
goto err;
if (copy_to_user(ubuf, &info, sizeof(info))) {
ret = -EFAULT;
goto err;
}
break;
}
default:
ret = -EINVAL;
goto err;
@ -5753,6 +5789,8 @@ static void binder_deferred_release(struct binder_proc *proc)
proc->is_dead = true;
proc->is_frozen = false;
proc->sync_recv = false;
proc->async_recv = false;
threads = 0;
active_transactions = 0;
while ((n = rb_first(&proc->threads))) {

6
drivers/android/binder_internal.h
View file

@ -406,6 +406,10 @@ enum binder_prio_state {
* @is_frozen: process is frozen and unable to service
* binder transactions
* (protected by @inner_lock)
* @sync_recv: process received sync transactions since last frozen
* (protected by @inner_lock)
* @async_recv: process received async transactions since last frozen
* (protected by @inner_lock)
* @freeze_wait: waitqueue of processes waiting for all outstanding
* transactions to be processed
* (protected by @inner_lock)
@ -454,6 +458,8 @@ struct binder_proc {
int outstanding_txns;
bool is_dead;
bool is_frozen;
bool sync_recv;
bool async_recv;
wait_queue_head_t freeze_wait;
struct list_head todo;

7
include/uapi/linux/android/binder.h
View file

@ -271,6 +271,12 @@ struct binder_freeze_info {
__u32 timeout_ms;
};
struct binder_frozen_status_info {
__u32 pid;
__u32 sync_recv;
__u32 async_recv;
};
#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, __s64)
#define BINDER_SET_MAX_THREADS _IOW('b', 5, __u32)
@ -282,6 +288,7 @@ struct binder_freeze_info {
#define BINDER_GET_NODE_INFO_FOR_REF _IOWR('b', 12, struct binder_node_info_for_ref)
#define BINDER_SET_CONTEXT_MGR_EXT _IOW('b', 13, struct flat_binder_object)
#define BINDER_FREEZE _IOW('b', 14, struct binder_freeze_info)
#define BINDER_GET_FROZEN_INFO _IOWR('b', 15, struct binder_frozen_status_info)
/*
* NOTE: Two special error codes you should check for when calling