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SubjectRe: [PATCH v2 3/4] binder: Make transaction_log available in binderfs
On Thu, Aug 29, 2019 at 02:18:11PM -0700, Hridya Valsaraju wrote:
> Currently, the binder transaction log files 'transaction_log'
> and 'failed_transaction_log' live in debugfs at the following locations:
>
> /sys/kernel/debug/binder/failed_transaction_log
> /sys/kernel/debug/binder/transaction_log
>
> This patch makes these files also available in a binderfs instance
> mounted with the mount option "stats=global".
> It does not affect the presence of these files in debugfs.
> If a binderfs instance is mounted at path /dev/binderfs, the location of
> these files will be as follows:
>
> /dev/binderfs/binder_logs/failed_transaction_log
> /dev/binderfs/binder_logs/transaction_log
>
> This change provides an alternate option to access these files when
> debugfs is not mounted.
>
> Signed-off-by: Hridya Valsaraju <hridya@google.com>

(If you don't change this patch in the next version, please just keep my:

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>

when sending it out. :)

> ---
>
> Changes in v2:
> -Consistent variable naming accross functions as per Christian Brauner.
>
> drivers/android/binder.c | 34 +++++--------------------------
> drivers/android/binder_internal.h | 30 +++++++++++++++++++++++++++
> drivers/android/binderfs.c | 18 ++++++++++++++++
> 3 files changed, 53 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index de795bd229c4..bed217310197 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -197,30 +197,8 @@ static inline void binder_stats_created(enum binder_stat_types type)
> atomic_inc(&binder_stats.obj_created[type]);
> }
>
> -struct binder_transaction_log_entry {
> - int debug_id;
> - int debug_id_done;
> - int call_type;
> - int from_proc;
> - int from_thread;
> - int target_handle;
> - int to_proc;
> - int to_thread;
> - int to_node;
> - int data_size;
> - int offsets_size;
> - int return_error_line;
> - uint32_t return_error;
> - uint32_t return_error_param;
> - const char *context_name;
> -};
> -struct binder_transaction_log {
> - atomic_t cur;
> - bool full;
> - struct binder_transaction_log_entry entry[32];
> -};
> -static struct binder_transaction_log binder_transaction_log;
> -static struct binder_transaction_log binder_transaction_log_failed;
> +struct binder_transaction_log binder_transaction_log;
> +struct binder_transaction_log binder_transaction_log_failed;
>
> static struct binder_transaction_log_entry *binder_transaction_log_add(
> struct binder_transaction_log *log)
> @@ -6166,7 +6144,7 @@ static void print_binder_transaction_log_entry(struct seq_file *m,
> "\n" : " (incomplete)\n");
> }
>
> -static int transaction_log_show(struct seq_file *m, void *unused)
> +int binder_transaction_log_show(struct seq_file *m, void *unused)
> {
> struct binder_transaction_log *log = m->private;
> unsigned int log_cur = atomic_read(&log->cur);
> @@ -6198,8 +6176,6 @@ const struct file_operations binder_fops = {
> .release = binder_release,
> };
>
> -DEFINE_SHOW_ATTRIBUTE(transaction_log);
> -
> static int __init init_binder_device(const char *name)
> {
> int ret;
> @@ -6268,12 +6244,12 @@ static int __init binder_init(void)
> 0444,
> binder_debugfs_dir_entry_root,
> &binder_transaction_log,
> - &transaction_log_fops);
> + &binder_transaction_log_fops);
> debugfs_create_file("failed_transaction_log",
> 0444,
> binder_debugfs_dir_entry_root,
> &binder_transaction_log_failed,
> - &transaction_log_fops);
> + &binder_transaction_log_fops);
> }
>
> if (!IS_ENABLED(CONFIG_ANDROID_BINDERFS) &&
> diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
> index 12ef96f256c6..b9be42d9464c 100644
> --- a/drivers/android/binder_internal.h
> +++ b/drivers/android/binder_internal.h
> @@ -65,4 +65,34 @@ DEFINE_SHOW_ATTRIBUTE(binder_state);
>
> int binder_transactions_show(struct seq_file *m, void *unused);
> DEFINE_SHOW_ATTRIBUTE(binder_transactions);
> +
> +int binder_transaction_log_show(struct seq_file *m, void *unused);
> +DEFINE_SHOW_ATTRIBUTE(binder_transaction_log);
> +
> +struct binder_transaction_log_entry {
> + int debug_id;
> + int debug_id_done;
> + int call_type;
> + int from_proc;
> + int from_thread;
> + int target_handle;
> + int to_proc;
> + int to_thread;
> + int to_node;
> + int data_size;
> + int offsets_size;
> + int return_error_line;
> + uint32_t return_error;
> + uint32_t return_error_param;
> + const char *context_name;
> +};
> +
> +struct binder_transaction_log {
> + atomic_t cur;
> + bool full;
> + struct binder_transaction_log_entry entry[32];
> +};
> +
> +extern struct binder_transaction_log binder_transaction_log;
> +extern struct binder_transaction_log binder_transaction_log_failed;
> #endif /* _LINUX_BINDER_INTERNAL_H */
> diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
> index 0e1e7c87cd33..1715e72ce9c7 100644
> --- a/drivers/android/binderfs.c
> +++ b/drivers/android/binderfs.c
> @@ -630,6 +630,24 @@ static int init_binder_logs(struct super_block *sb)
>
> dentry = binderfs_create_file(binder_logs_root_dir, "transactions",
> &binder_transactions_fops, NULL);
> + if (IS_ERR(dentry)) {
> + ret = PTR_ERR(dentry);
> + goto out;
> + }
> +
> + dentry = binderfs_create_file(binder_logs_root_dir,
> + "transaction_log",
> + &binder_transaction_log_fops,
> + &binder_transaction_log);
> + if (IS_ERR(dentry)) {
> + ret = PTR_ERR(dentry);
> + goto out;
> + }
> +
> + dentry = binderfs_create_file(binder_logs_root_dir,
> + "failed_transaction_log",
> + &binder_transaction_log_fops,
> + &binder_transaction_log_failed);
> if (IS_ERR(dentry))
> ret = PTR_ERR(dentry);
>
> --
> 2.23.0.187.g17f5b7556c-goog
>

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