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ANDROID: binder: add support for RT prio inheritance.

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Adds support for SCHED_BATCH/SCHED_FIFO/SCHED_RR
priority inheritance.

Change-Id: I71f356e476be2933713a0ecfa2cc31aa141e2dc6
Signed-off-by: Martijn Coenen <maco@google.com>
This commit is contained in:
Martijn Coenen
2017-06-06 17:04:42 -07:00
committed by Amit Pundir
parent 96cfe2a15b
commit 8bda88250b
1 changed files with 134 additions and 29 deletions
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163
drivers/android/binder.c
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@@ -465,6 +465,22 @@ enum binder_deferred_state {
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;
};
/**
* struct binder_proc - binder process bookkeeping
* @proc_node: element for binder_procs list
@@ -544,7 +560,7 @@ struct binder_proc {
int requested_threads;
int requested_threads_started;
int tmp_ref;
long default_priority;
struct binder_priority default_priority;
struct dentry *debugfs_entry;
struct binder_alloc alloc;
struct binder_context *context;
@@ -626,8 +642,8 @@ struct binder_transaction {
struct binder_buffer *buffer;
unsigned int code;
unsigned int flags;
long priority;
long saved_priority;
struct binder_priority priority;
struct binder_priority saved_priority;
kuid_t sender_euid;
/**
* @lock: protects @from, @to_proc, and @to_thread
@@ -1053,22 +1069,93 @@ static void binder_wakeup_proc_ilocked(struct binder_proc *proc)
binder_wakeup_thread_ilocked(proc, thread, /* sync = */false);
}
static void binder_set_nice(long nice)
static bool is_rt_policy(int policy)
{
long min_nice;
return policy == SCHED_FIFO || policy == SCHED_RR;
}
if (can_nice(current, nice)) {
set_user_nice(current, nice);
static bool is_fair_policy(int policy)
{
return policy == SCHED_NORMAL || policy == SCHED_BATCH;
}
static bool binder_supported_policy(int policy)
{
return is_fair_policy(policy) || is_rt_policy(policy);
}
static int to_userspace_prio(int policy, int kernel_priority)
{
if (is_fair_policy(policy))
return PRIO_TO_NICE(kernel_priority);
else
return MAX_USER_RT_PRIO - 1 - kernel_priority;
}
static int to_kernel_prio(int policy, int user_priority)
{
if (is_fair_policy(policy))
return NICE_TO_PRIO(user_priority);
else
return MAX_USER_RT_PRIO - 1 - user_priority;
}
static void binder_set_priority(struct task_struct *task,
struct binder_priority desired)
{
int priority; /* user-space prio value */
bool has_cap_nice;
unsigned int policy = desired.sched_policy;
if (task->policy == policy && task->normal_prio == desired.prio)
return;
has_cap_nice = has_capability_noaudit(task, CAP_SYS_NICE);
priority = to_userspace_prio(policy, desired.prio);
if (is_rt_policy(policy) && !has_cap_nice) {
long max_rtprio = task_rlimit(task, RLIMIT_RTPRIO);
if (max_rtprio == 0) {
policy = SCHED_NORMAL;
priority = MIN_NICE;
} else if (priority > max_rtprio) {
priority = max_rtprio;
}
}
min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
binder_debug(BINDER_DEBUG_PRIORITY_CAP,
"%d: nice value %ld not allowed use %ld instead\n",
current->pid, nice, min_nice);
set_user_nice(current, min_nice);
if (min_nice <= MAX_NICE)
return;
binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
if (is_fair_policy(policy) && !has_cap_nice) {
long min_nice = rlimit_to_nice(task_rlimit(task, RLIMIT_NICE));
if (min_nice > MAX_NICE) {
binder_user_error("%d RLIMIT_NICE not set\n",
task->pid);
return;
} else if (priority < min_nice) {
priority = min_nice;
}
}
if (policy != desired.sched_policy ||
to_kernel_prio(policy, priority) != desired.prio)
binder_debug(BINDER_DEBUG_PRIORITY_CAP,
"%d: priority %d not allowed, using %d instead\n",
task->pid, desired.prio,
to_kernel_prio(policy, priority));
/* Set the actual priority */
if (task->policy != policy || is_rt_policy(policy)) {
struct sched_param params;
params.sched_priority = is_rt_policy(policy) ? priority : 0;
sched_setscheduler_nocheck(task,
policy | SCHED_RESET_ON_FORK,
&params);
}
if (is_fair_policy(policy))
set_user_nice(task, priority);
}
static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc,
@@ -1152,7 +1239,8 @@ static struct binder_node *binder_init_node_ilocked(
node->ptr = ptr;
node->cookie = cookie;
node->work.type = BINDER_WORK_NODE;
node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
node->min_priority = NICE_TO_PRIO(
flags & FLAT_BINDER_FLAG_PRIORITY_MASK);
node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
spin_lock_init(&node->lock);
INIT_LIST_HEAD(&node->work.entry);
@@ -2649,7 +2737,7 @@ static void binder_transaction(struct binder_proc *proc,
}
thread->transaction_stack = in_reply_to->to_parent;
binder_inner_proc_unlock(proc);
binder_set_nice(in_reply_to->saved_priority);
binder_set_priority(current, in_reply_to->saved_priority);
target_thread = binder_get_txn_from_and_acq_inner(in_reply_to);
if (target_thread == NULL) {
return_error = BR_DEAD_REPLY;
@@ -2822,7 +2910,15 @@ static void binder_transaction(struct binder_proc *proc,
t->to_thread = target_thread;
t->code = tr->code;
t->flags = tr->flags;
t->priority = task_nice(current);
if (!(t->flags & TF_ONE_WAY) &&
binder_supported_policy(current->policy)) {
/* Inherit supported policies for synchronous transactions */
t->priority.sched_policy = current->policy;
t->priority.prio = current->normal_prio;
} else {
/* Otherwise, fall back to the default priority */
t->priority = target_proc->default_priority;
}
trace_binder_transaction(reply, t, target_node);
@@ -3738,7 +3834,7 @@ retry:
wait_event_interruptible(binder_user_error_wait,
binder_stop_on_user_error < 2);
}
binder_set_nice(proc->default_priority);
binder_set_priority(current, proc->default_priority);
}
if (non_block) {
@@ -3950,16 +4046,17 @@ retry:
BUG_ON(t->buffer == NULL);
if (t->buffer->target_node) {
struct binder_node *target_node = t->buffer->target_node;
struct binder_priority prio = t->priority;
tr.target.ptr = target_node->ptr;
tr.cookie = target_node->cookie;
t->saved_priority = task_nice(current);
if (t->priority < target_node->min_priority &&
!(t->flags & TF_ONE_WAY))
binder_set_nice(t->priority);
else if (!(t->flags & TF_ONE_WAY) ||
t->saved_priority > target_node->min_priority)
binder_set_nice(target_node->min_priority);
t->saved_priority.sched_policy = current->policy;
t->saved_priority.prio = current->normal_prio;
if (target_node->min_priority < t->priority.prio) {
prio.sched_policy = SCHED_NORMAL;
prio.prio = target_node->min_priority;
}
binder_set_priority(current, prio);
cmd = BR_TRANSACTION;
} else {
tr.target.ptr = 0;
@@ -4565,7 +4662,14 @@ static int binder_open(struct inode *nodp, struct file *filp)
get_task_struct(current->group_leader);
proc->tsk = current->group_leader;
INIT_LIST_HEAD(&proc->todo);
proc->default_priority = task_nice(current);
if (binder_supported_policy(current->policy)) {
proc->default_priority.sched_policy = current->policy;
proc->default_priority.prio = current->normal_prio;
} else {
proc->default_priority.sched_policy = SCHED_NORMAL;
proc->default_priority.prio = NICE_TO_PRIO(0);
}
binder_dev = container_of(filp->private_data, struct binder_device,
miscdev);
proc->context = &binder_dev->context;
@@ -4858,13 +4962,14 @@ static void print_binder_transaction_ilocked(struct seq_file *m,
spin_lock(&t->lock);
to_proc = t->to_proc;
seq_printf(m,
"%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
"%s %d: %p from %d:%d to %d:%d code %x flags %x pri %d:%d r%d",
prefix, t->debug_id, t,
t->from ? t->from->proc->pid : 0,
t->from ? t->from->pid : 0,
to_proc ? to_proc->pid : 0,
t->to_thread ? t->to_thread->pid : 0,
t->code, t->flags, t->priority, t->need_reply);
t->code, t->flags, t->priority.sched_policy,
t->priority.prio, t->need_reply);
spin_unlock(&t->lock);
if (proc != to_proc) {