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| author | Marco Ballesio <balejs@google.com> | 2021-03-16 02:16:28 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-24 08:26:31 +0100 |
| commit | 432ff1e91694e4c55a5bf6bc0574f4c254970232 (patch) | |
| tree | 7ff3098e466f0f7684530c514c02b61120a59cc8 /drivers/android/binder_internal.h | |
| parent | vmci_host: print unexpanded names of ioctl requests in debug messages (diff) | |
| download | linux-432ff1e91694e4c55a5bf6bc0574f4c254970232.tar.xz linux-432ff1e91694e4c55a5bf6bc0574f4c254970232.zip | |
binder: BINDER_FREEZE ioctl
Frozen tasks can't process binder transactions, so a way is required to
inform transmitting ends of communication failures due to the frozen
state of their receiving counterparts. Additionally, races are possible
between transitions to frozen state and binder transactions enqueued to
a specific process.
Implement BINDER_FREEZE ioctl for user space to inform the binder driver
about the intention to freeze or unfreeze a process. When the ioctl is
called, block the caller until any pending binder transactions toward
the target process are flushed. Return an error to transactions to
processes marked as frozen.
Co-developed-by: Todd Kjos <tkjos@google.com>
Acked-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Marco Ballesio <balejs@google.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Li Li <dualli@google.com>
Link: https://lore.kernel.org/r/20210316011630.1121213-2-dualli@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android/binder_internal.h')
| -rw-r--r-- | drivers/android/binder_internal.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h index 6cd79011e35d..e6a53e98c6da 100644 --- a/drivers/android/binder_internal.h +++ b/drivers/android/binder_internal.h @@ -367,9 +367,18 @@ struct binder_ref { * (protected by binder_deferred_lock) * @deferred_work: bitmap of deferred work to perform * (protected by binder_deferred_lock) + * @outstanding_txns: number of transactions to be transmitted before + * processes in freeze_wait are woken up + * (protected by @inner_lock) * @is_dead: process is dead and awaiting free * when outstanding transactions are cleaned up * (protected by @inner_lock) + * @is_frozen: process is frozen and unable to service + * binder transactions + * (protected by @inner_lock) + * @freeze_wait: waitqueue of processes waiting for all outstanding + * transactions to be processed + * (protected by @inner_lock) * @todo: list of work for this process * (protected by @inner_lock) * @stats: per-process binder statistics @@ -410,7 +419,10 @@ struct binder_proc { struct task_struct *tsk; struct hlist_node deferred_work_node; int deferred_work; + int outstanding_txns; bool is_dead; + bool is_frozen; + wait_queue_head_t freeze_wait; struct list_head todo; struct binder_stats stats; |