Release 4.7 drivers/tty/tty_buffer.c

/*
 * Tty buffer allocation management
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/ratelimit.h>



#define MIN_TTYB_SIZE	256

#define TTYB_ALIGN_MASK	255

/*
 * Byte threshold to limit memory consumption for flip buffers.
 * The actual memory limit is > 2x this amount.
 */

#define TTYB_DEFAULT_MEM_LIMIT	65536

/*
 * We default to dicing tty buffer allocations to this many characters
 * in order to avoid multiple page allocations. We know the size of
 * tty_buffer itself but it must also be taken into account that the
 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
 * logic this must match
 */


#define TTY_BUFFER_PAGE	(((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)

/**
 *      tty_buffer_lock_exclusive       -       gain exclusive access to buffer
 *      tty_buffer_unlock_exclusive     -       release exclusive access
 *
 *      @port - tty_port owning the flip buffer
 *
 *      Guarantees safe use of the line discipline's receive_buf() method by
 *      excluding the buffer work and any pending flush from using the flip
 *      buffer. Data can continue to be added concurrently to the flip buffer
 *      from the driver side.
 *
 *      On release, the buffer work is restarted if there is data in the
 *      flip buffer
 */



void tty_buffer_lock_exclusive(struct tty_port *port)
{
	struct tty_bufhead *buf = &port->buf;

	atomic_inc(&buf->priority);
	mutex_lock(&buf->lock);
}
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EXPORT_SYMBOL_GPL(tty_buffer_lock_exclusive);



void tty_buffer_unlock_exclusive(struct tty_port *port)
{
	struct tty_bufhead *buf = &port->buf;
	int restart;

	restart = buf->head->commit != buf->head->read;

	atomic_dec(&buf->priority);
	mutex_unlock(&buf->lock);
	if (restart)
		queue_work(system_unbound_wq, &buf->work);
}
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EXPORT_SYMBOL_GPL(tty_buffer_unlock_exclusive);

/**
 *      tty_buffer_space_avail  -       return unused buffer space
 *      @port - tty_port owning the flip buffer
 *
 *      Returns the # of bytes which can be written by the driver without
 *      reaching the buffer limit.
 *
 *      Note: this does not guarantee that memory is available to write
 *      the returned # of bytes (use tty_prepare_flip_string_xxx() to
 *      pre-allocate if memory guarantee is required).
 */



int tty_buffer_space_avail(struct tty_port *port)
{
	int space = port->buf.mem_limit - atomic_read(&port->buf.mem_used);
	return max(space, 0);
}
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EXPORT_SYMBOL_GPL(tty_buffer_space_avail);



static void tty_buffer_reset(struct tty_buffer *p, size_t size)
{
	p->used = 0;
	p->size = size;
	p->next = NULL;
	p->commit = 0;
	p->read = 0;
	p->flags = 0;
}

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/**
 *      tty_buffer_free_all             -       free buffers used by a tty
 *      @tty: tty to free from
 *
 *      Remove all the buffers pending on a tty whether queued with data
 *      or in the free ring. Must be called when the tty is no longer in use
 */



void tty_buffer_free_all(struct tty_port *port)
{
	struct tty_bufhead *buf = &port->buf;
	struct tty_buffer *p, *next;
	struct llist_node *llist;

	while ((p = buf->head) != NULL) {
		buf->head = p->next;
		if (p->size > 0)
			kfree(p);
	}
	llist = llist_del_all(&buf->free);
	llist_for_each_entry_safe(p, next, llist, free)
		kfree(p);

	tty_buffer_reset(&buf->sentinel, 0);
	buf->head = &buf->sentinel;
	buf->tail = &buf->sentinel;

	atomic_set(&buf->mem_used, 0);
}

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alan cox
49
37.40%
1
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jiri slaby
jiri slaby
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2
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/**
 *      tty_buffer_alloc        -       allocate a tty buffer
 *      @tty: tty device
 *      @size: desired size (characters)
 *
 *      Allocate a new tty buffer to hold the desired number of characters.
 *      We round our buffers off in 256 character chunks to get better
 *      allocation behaviour.
 *      Return NULL if out of memory or the allocation would exceed the
 *      per device queue
 */



static struct tty_buffer *tty_buffer_alloc(struct tty_port *port, size_t size)
{
	struct llist_node *free;
	struct tty_buffer *p;

	/* Round the buffer size out */
	size = __ALIGN_MASK(size, TTYB_ALIGN_MASK);

	if (size <= MIN_TTYB_SIZE) {
		free = llist_del_first(&port->buf.free);
		if (free) {
			p = llist_entry(free, struct tty_buffer, free);
			goto found;
		}
	}

	/* Should possibly check if this fails for the largest buffer we
           have queued and recycle that ? */
	if (atomic_read(&port->buf.mem_used) > port->buf.mem_limit)
		return NULL;
	p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
	if (p == NULL)
		return NULL;

found:
	tty_buffer_reset(p, size);
	atomic_add(size, &port->buf.mem_used);
	return p;
}

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alan cox
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42.28%
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jiri slaby
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/**
 *      tty_buffer_free         -       free a tty buffer
 *      @tty: tty owning the buffer
 *      @b: the buffer to free
 *
 *      Free a tty buffer, or add it to the free list according to our
 *      internal strategy
 */



static void tty_buffer_free(struct tty_port *port, struct tty_buffer *b)
{
	struct tty_bufhead *buf = &port->buf;

	/* Dumb strategy for now - should keep some stats */
	WARN_ON(atomic_sub_return(b->size, &buf->mem_used) < 0);

	if (b->size > MIN_TTYB_SIZE)
		kfree(b);
	else if (b->size > 0)
		llist_add(&b->free, &buf->free);
}

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jiri slaby
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/**
 *      tty_buffer_flush                -       flush full tty buffers
 *      @tty: tty to flush
 *      @ld:  optional ldisc ptr (must be referenced)
 *
 *      flush all the buffers containing receive data. If ld != NULL,
 *      flush the ldisc input buffer.
 *
 *      Locking: takes buffer lock to ensure single-threaded flip buffer
 *               'consumer'
 */



void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld)
{
	struct tty_port *port = tty->port;
	struct tty_bufhead *buf = &port->buf;
	struct tty_buffer *next;

	atomic_inc(&buf->priority);

	mutex_lock(&buf->lock);
	/* paired w/ release in __tty_buffer_request_room; ensures there are
         * no pending memory accesses to the freed buffer
         */
	while ((next = smp_load_acquire(&buf->head->next)) != NULL) {
		tty_buffer_free(port, buf->head);
		buf->head = next;
	}
	buf->head->read = buf->head->commit;

	if (ld && ld->ops->flush_buffer)
		ld->ops->flush_buffer(tty);

	atomic_dec(&buf->priority);
	mutex_unlock(&buf->lock);
}

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alan cox
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ilya zykov
ilya zykov
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jiri slaby
jiri slaby
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dmitriy vyukov
dmitriy vyukov
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/**
 *      tty_buffer_request_room         -       grow tty buffer if needed
 *      @tty: tty structure
 *      @size: size desired
 *      @flags: buffer flags if new buffer allocated (default = 0)
 *
 *      Make at least size bytes of linear space available for the tty
 *      buffer. If we fail return the size we managed to find.
 *
 *      Will change over to a new buffer if the current buffer is encoded as
 *      TTY_NORMAL (so has no flags buffer) and the new buffer requires
 *      a flags buffer.
 */


static int __tty_buffer_request_room(struct tty_port *port, size_t size,
				     int flags)
{
	struct tty_bufhead *buf = &port->buf;
	struct tty_buffer *b, *n;
	int left, change;

	b = buf->tail;
	if (b->flags & TTYB_NORMAL)
		left = 2 * b->size - b->used;
	else
		left = b->size - b->used;

	change = (b->flags & TTYB_NORMAL) && (~flags & TTYB_NORMAL);
	if (change || left < size) {
		/* This is the slow path - looking for new buffers to use */
		n = tty_buffer_alloc(port, size);
		if (n != NULL) {
			n->flags = flags;
			buf->tail = n;
			/* paired w/ acquire in flush_to_ldisc(); ensures
                         * flush_to_ldisc() sees buffer data.
                         */
			smp_store_release(&b->commit, b->used);
			/* paired w/ acquire in flush_to_ldisc(); ensures the
                         * latest commit value can be read before the head is
                         * advanced to the next buffer
                         */
			smp_store_release(&b->next, n);
		} else if (change)
			size = 0;
		else
			size = left;
	}
	return size;
}

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alan cox
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peter hurley
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jiri slaby
jiri slaby
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dmitriy vyukov
dmitriy vyukov
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greg kroah-hartman
greg kroah-hartman
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int tty_buffer_request_room(struct tty_port *port, size_t size)
{
	return __tty_buffer_request_room(port, size, 0);
}
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EXPORT_SYMBOL_GPL(tty_buffer_request_room);

/**
 *      tty_insert_flip_string_fixed_flag - Add characters to the tty buffer
 *      @port: tty port
 *      @chars: characters
 *      @flag: flag value for each character
 *      @size: size
 *
 *      Queue a series of bytes to the tty buffering. All the characters
 *      passed are marked with the supplied flag. Returns the number added.
 */



int tty_insert_flip_string_fixed_flag(struct tty_port *port,
		const unsigned char *chars, char flag, size_t size)
{
	int copied = 0;
	do {
		int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
		int flags = (flag == TTY_NORMAL) ? TTYB_NORMAL : 0;
		int space = __tty_buffer_request_room(port, goal, flags);
		struct tty_buffer *tb = port->buf.tail;
		if (unlikely(space == 0))
			break;
		memcpy(char_buf_ptr(tb, tb->used), chars, space);
		if (~tb->flags & TTYB_NORMAL)
			memset(flag_buf_ptr(tb, tb->used), flag, space);
		tb->used += space;
		copied += space;
		chars += space;
		/* There is a small chance that we need to split the data over
                   several buffers. If this is the case we must loop */
	} while (unlikely(size > copied));
	return copied;
}
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peter hurley
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ilya zykov
ilya zykov
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jiri slaby
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fang wenqi
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EXPORT_SYMBOL(tty_insert_flip_string_fixed_flag);

/**
 *      tty_insert_flip_string_flags    -       Add characters to the tty buffer
 *      @port: tty port
 *      @chars: characters
 *      @flags: flag bytes
 *      @size: size
 *
 *      Queue a series of bytes to the tty buffering. For each character
 *      the flags array indicates the status of the character. Returns the
 *      number added.
 */



int tty_insert_flip_string_flags(struct tty_port *port,
		const unsigned char *chars, const char *flags, size_t size)
{
	int copied = 0;
	do {
		int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
		int space = tty_buffer_request_room(port, goal);
		struct tty_buffer *tb = port->buf.tail;
		if (unlikely(space == 0))
			break;
		memcpy(char_buf_ptr(tb, tb->used), chars, space);
		memcpy(flag_buf_ptr(tb, tb->used), flags, space);
		tb->used += space;
		copied += space;
		chars += space;
		flags += space;
		/* There is a small chance that we need to split the data over
                   several buffers. If this is the case we must loop */
	} while (unlikely(size > copied));
	return copied;
}
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peter hurley
peter hurley
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jiri slaby
jiri slaby
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fang wenqi
fang wenqi
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EXPORT_SYMBOL(tty_insert_flip_string_flags);

/**
 *      tty_schedule_flip       -       push characters to ldisc
 *      @port: tty port to push from
 *
 *      Takes any pending buffers and transfers their ownership to the
 *      ldisc side of the queue. It then schedules those characters for
 *      processing by the line discipline.
 */



void tty_schedule_flip(struct tty_port *port)
{
	struct tty_bufhead *buf = &port->buf;

	/* paired w/ acquire in flush_to_ldisc(); ensures
         * flush_to_ldisc() sees buffer data.
         */
	smp_store_release(&buf->tail->commit, buf->tail->used);
	queue_work(system_unbound_wq, &buf->work);
}
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dmitriy vyukov
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peter hurley
peter hurley
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EXPORT_SYMBOL(tty_schedule_flip);

/**
 *      tty_prepare_flip_string         -       make room for characters
 *      @port: tty port
 *      @chars: return pointer for character write area
 *      @size: desired size
 *
 *      Prepare a block of space in the buffer for data. Returns the length
 *      available and buffer pointer to the space which is now allocated and
 *      accounted for as ready for normal characters. This is used for drivers
 *      that need their own block copy routines into the buffer. There is no
 *      guarantee the buffer is a DMA target!
 */



int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
		size_t size)
{
	int space = __tty_buffer_request_room(port, size, TTYB_NORMAL);
	if (likely(space)) {
		struct tty_buffer *tb = port->buf.tail;
		*chars = char_buf_ptr(tb, tb->used);
		if (~tb->flags & TTYB_NORMAL)
			memset(flag_buf_ptr(tb, tb->used), TTY_NORMAL, space);
		tb->used += space;
	}
	return space;
}
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peter hurley
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20.62%
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ilya zykov
ilya zykov
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13.40%
1
16.67%
jiri slaby
jiri slaby
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EXPORT_SYMBOL_GPL(tty_prepare_flip_string);

/**
 *      tty_ldisc_receive_buf           -       forward data to line discipline
 *      @ld:    line discipline to process input
 *      @p:     char buffer
 *      @f:     TTY_* flags buffer
 *      @count: number of bytes to process
 *
 *      Callers other than flush_to_ldisc() need to exclude the kworker
 *      from concurrent use of the line discipline, see paste_selection().
 *
 *      Returns the number of bytes not processed
 */


int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
			  char *f, int count)
{
	if (ld->ops->receive_buf2)
		count = ld->ops->receive_buf2(ld->tty, p, f, count);
	else {
		count = min_t(int, count, ld->tty->receive_room);
		if (count && ld->ops->receive_buf)
			ld->ops->receive_buf(ld->tty, p, f, count);
	}
	return count;
}
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EXPORT_SYMBOL_GPL(tty_ldisc_receive_buf);


static int

receive_buf(struct tty_ldisc *ld, struct tty_buffer *head, int count)
{
	unsigned char *p = char_buf_ptr(head, head->read);
	char	      *f = NULL;

	if (~head->flags & TTYB_NORMAL)
		f = flag_buf_ptr(head, head->read);

	return tty_ldisc_receive_buf(ld, p, f, count);
}

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/**
 *      flush_to_ldisc
 *      @work: tty structure passed from work queue.
 *
 *      This routine is called out of the software interrupt to flush data
 *      from the buffer chain to the line discipline.
 *
 *      The receive_buf method is single threaded for each tty instance.
 *
 *      Locking: takes buffer lock to ensure single-threaded flip buffer
 *               'consumer'
 */



static void flush_to_ldisc(struct work_struct *work)
{
	struct tty_port *port = container_of(work, struct tty_port, buf.work);
	struct tty_bufhead *buf = &port->buf;
	struct tty_struct *tty;
	struct tty_ldisc *disc;

	tty = READ_ONCE(port->itty);
	if (tty == NULL)
		return;

	disc = tty_ldisc_ref(tty);
	if (disc == NULL)
		return;

	mutex_lock(&buf->lock);

	while (1) {
		struct tty_buffer *head = buf->head;
		struct tty_buffer *next;
		int count;

		/* Ldisc or user is trying to gain exclusive access */
		if (atomic_read(&buf->priority))
			break;

		/* paired w/ release in __tty_buffer_request_room();
                 * ensures commit value read is not stale if the head
                 * is advancing to the next buffer
                 */
		next = smp_load_acquire(&head->next);
		/* paired w/ release in __tty_buffer_request_room() or in
                 * tty_buffer_flush(); ensures we see the committed buffer data
                 */
		count = smp_load_acquire(&head->commit) - head->read;
		if (!count) {
			if (next == NULL)
				break;
			buf->head = next;
			tty_buffer_free(port, head);
			continue;
		}

		count = receive_buf(disc, head, count);
		if (!count)
			break;
		head->read += count;
	}

	mutex_unlock(&buf->lock);

	tty_ldisc_deref(disc);
}

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peter hurley
56
26.54%
11
61.11%
jiri slaby
jiri slaby
36
17.06%
3
16.67%
linus torvalds
linus torvalds
10
4.74%
1
5.56%
dmitriy vyukov
dmitriy vyukov
8
3.79%
2
11.11%
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211
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100.00%

/**
 *      tty_flip_buffer_push    -       terminal
 *      @port: tty port to push
 *
 *      Queue a push of the terminal flip buffers to the line discipline.
 *      Can be called from IRQ/atomic context.
 *
 *      In the event of the queue being busy for flipping the work will be
 *      held off and retried later.
 */



void tty_flip_buffer_push(struct tty_port *port)
{
	tty_schedule_flip(port);
}
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13.33%
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peter hurley
peter hurley
2
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100.00%


EXPORT_SYMBOL(tty_flip_buffer_push);

/**
 *      tty_buffer_init         -       prepare a tty buffer structure
 *      @tty: tty to initialise
 *
 *      Set up the initial state of the buffer management for a tty device.
 *      Must be called before the other tty buffer functions are used.
 */



void tty_buffer_init(struct tty_port *port)
{
	struct tty_bufhead *buf = &port->buf;

	mutex_init(&buf->lock);
	tty_buffer_reset(&buf->sentinel, 0);
	buf->head = &buf->sentinel;
	buf->tail = &buf->sentinel;
	init_llist_head(&buf->free);
	atomic_set(&buf->mem_used, 0);
	atomic_set(&buf->priority, 0);
	INIT_WORK(&buf->work, flush_to_ldisc);
	buf->mem_limit = TTYB_DEFAULT_MEM_LIMIT;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
peter hurley
peter hurley
47
47.00%
8
66.67%
alan cox
alan cox
34
34.00%
1
8.33%
jiri slaby
jiri slaby
18
18.00%
2
16.67%
linus torvalds
linus torvalds
1
1.00%
1
8.33%
Total
100
100.00%
12
100.00%

/**
 *      tty_buffer_set_limit    -       change the tty buffer memory limit
 *      @port: tty port to change
 *
 *      Change the tty buffer memory limit.
 *      Must be called before the other tty buffer functions are used.
 */



int tty_buffer_set_limit(struct tty_port *port, int limit)
{
	if (limit < MIN_TTYB_SIZE)
		return -EINVAL;
	port->buf.mem_limit = limit;
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
peter hurley
peter hurley
33
97.06%
1
50.00%
alan cox
alan cox
1
2.94%
1
50.00%
Total
34
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(tty_buffer_set_limit);

/* slave ptys can claim nested buffer lock when handling BRK and INTR */


void tty_buffer_set_lock_subclass(struct tty_port *port)
{
	lockdep_set_subclass(&port->buf.lock, TTY_LOCK_SLAVE);
}

Contributors
Person
Tokens
Prop
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CommitProp
peter hurley
peter hurley
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%



bool tty_buffer_restart_work(struct tty_port *port)
{
	return queue_work(system_unbound_wq, &port->buf.work);
}

Contributors
Person
Tokens
Prop
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CommitProp
peter hurley
peter hurley
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



bool tty_buffer_cancel_work(struct tty_port *port)
{
	return cancel_work_sync(&port->buf.work);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
peter hurley
peter hurley
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%



void tty_buffer_flush_work(struct tty_port *port)
{
	flush_work(&port->buf.work);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
brian bloniarz
brian bloniarz
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
peter hurley
peter hurley
1007
48.51%
32
61.54%
alan cox
alan cox
789
38.01%
3
5.77%
jiri slaby
jiri slaby
146
7.03%
6
11.54%
ilya zykov
ilya zykov
55
2.65%
1
1.92%
dmitriy vyukov
dmitriy vyukov
25
1.20%
3
5.77%
brian bloniarz
brian bloniarz
20
0.96%
1
1.92%
linus torvalds
linus torvalds
11
0.53%
2
3.85%
ben hutchings
ben hutchings
10
0.48%
1
1.92%
fang wenqi
fang wenqi
6
0.29%
1
1.92%
greg kroah-hartman
greg kroah-hartman
4
0.19%
1
1.92%
george spelvin
george spelvin
3
0.14%
1
1.92%
Total
2076
100.00%
52
100.00%
  
Directory: drivers/tty

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