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![Manfred Schlaegl](/assets/img/avatar_default.png)
We increase the default limit for buffer memory allocation by a factor of 10 to 640K to prevent data loss when using fast serial interfaces. For example when using RS485 without flow-control at speeds of 1Mbit/s an upwards we've run into problems such as applications being too slow to read out this buffer (on embedded devices based on imx53 or imx6). If you want to write transmitted data to a slow SD card and thus have realtime requirements, this limit can become a problem. That shouldn't be the case and 640K buffers fix such problems for us. This value is a maximum limit for allocation only. It has no effect on systems that currently run fine. When transmission is slow enough applications and hardware can keep up and increasing this limit doesn't change anything. It only _allows_ to allocate more than 2*64K in cases we currently fail to allocate memory despite having some. Signed-off-by: Manfred Schlaegl <manfred.schlaegl@ginzinger.com> Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
619 lines
16 KiB
C
619 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Tty buffer allocation management
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/ratelimit.h>
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#define MIN_TTYB_SIZE 256
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#define TTYB_ALIGN_MASK 255
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/*
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* Byte threshold to limit memory consumption for flip buffers.
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* The actual memory limit is > 2x this amount.
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*/
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#define TTYB_DEFAULT_MEM_LIMIT (640 * 1024UL)
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/*
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* We default to dicing tty buffer allocations to this many characters
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* in order to avoid multiple page allocations. We know the size of
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* tty_buffer itself but it must also be taken into account that the
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* the buffer is 256 byte aligned. See tty_buffer_find for the allocation
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* logic this must match
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*/
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#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
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/**
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* tty_buffer_lock_exclusive - gain exclusive access to buffer
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* tty_buffer_unlock_exclusive - release exclusive access
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*
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* @port - tty_port owning the flip buffer
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*
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* Guarantees safe use of the line discipline's receive_buf() method by
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* excluding the buffer work and any pending flush from using the flip
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* buffer. Data can continue to be added concurrently to the flip buffer
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* from the driver side.
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*
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* On release, the buffer work is restarted if there is data in the
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* flip buffer
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*/
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void tty_buffer_lock_exclusive(struct tty_port *port)
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{
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struct tty_bufhead *buf = &port->buf;
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atomic_inc(&buf->priority);
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mutex_lock(&buf->lock);
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}
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EXPORT_SYMBOL_GPL(tty_buffer_lock_exclusive);
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void tty_buffer_unlock_exclusive(struct tty_port *port)
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{
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struct tty_bufhead *buf = &port->buf;
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int restart;
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restart = buf->head->commit != buf->head->read;
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atomic_dec(&buf->priority);
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mutex_unlock(&buf->lock);
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if (restart)
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queue_work(system_unbound_wq, &buf->work);
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}
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EXPORT_SYMBOL_GPL(tty_buffer_unlock_exclusive);
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/**
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* tty_buffer_space_avail - return unused buffer space
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* @port - tty_port owning the flip buffer
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*
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* Returns the # of bytes which can be written by the driver without
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* reaching the buffer limit.
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*
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* Note: this does not guarantee that memory is available to write
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* the returned # of bytes (use tty_prepare_flip_string_xxx() to
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* pre-allocate if memory guarantee is required).
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*/
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int tty_buffer_space_avail(struct tty_port *port)
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{
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int space = port->buf.mem_limit - atomic_read(&port->buf.mem_used);
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return max(space, 0);
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}
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EXPORT_SYMBOL_GPL(tty_buffer_space_avail);
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static void tty_buffer_reset(struct tty_buffer *p, size_t size)
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{
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p->used = 0;
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p->size = size;
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p->next = NULL;
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p->commit = 0;
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p->read = 0;
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p->flags = 0;
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}
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/**
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* tty_buffer_free_all - free buffers used by a tty
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* @tty: tty to free from
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*
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* Remove all the buffers pending on a tty whether queued with data
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* or in the free ring. Must be called when the tty is no longer in use
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*/
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void tty_buffer_free_all(struct tty_port *port)
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{
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struct tty_bufhead *buf = &port->buf;
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struct tty_buffer *p, *next;
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struct llist_node *llist;
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unsigned int freed = 0;
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int still_used;
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while ((p = buf->head) != NULL) {
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buf->head = p->next;
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freed += p->size;
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if (p->size > 0)
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kfree(p);
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}
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llist = llist_del_all(&buf->free);
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llist_for_each_entry_safe(p, next, llist, free)
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kfree(p);
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tty_buffer_reset(&buf->sentinel, 0);
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buf->head = &buf->sentinel;
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buf->tail = &buf->sentinel;
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still_used = atomic_xchg(&buf->mem_used, 0);
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WARN(still_used != freed, "we still have not freed %d bytes!",
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still_used - freed);
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}
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/**
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* tty_buffer_alloc - allocate a tty buffer
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* @tty: tty device
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* @size: desired size (characters)
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*
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* Allocate a new tty buffer to hold the desired number of characters.
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* We round our buffers off in 256 character chunks to get better
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* allocation behaviour.
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* Return NULL if out of memory or the allocation would exceed the
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* per device queue
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*/
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static struct tty_buffer *tty_buffer_alloc(struct tty_port *port, size_t size)
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{
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struct llist_node *free;
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struct tty_buffer *p;
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/* Round the buffer size out */
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size = __ALIGN_MASK(size, TTYB_ALIGN_MASK);
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if (size <= MIN_TTYB_SIZE) {
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free = llist_del_first(&port->buf.free);
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if (free) {
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p = llist_entry(free, struct tty_buffer, free);
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goto found;
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}
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}
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/* Should possibly check if this fails for the largest buffer we
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have queued and recycle that ? */
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if (atomic_read(&port->buf.mem_used) > port->buf.mem_limit)
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return NULL;
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p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
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if (p == NULL)
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return NULL;
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found:
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tty_buffer_reset(p, size);
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atomic_add(size, &port->buf.mem_used);
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return p;
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}
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/**
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* tty_buffer_free - free a tty buffer
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* @tty: tty owning the buffer
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* @b: the buffer to free
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*
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* Free a tty buffer, or add it to the free list according to our
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* internal strategy
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*/
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static void tty_buffer_free(struct tty_port *port, struct tty_buffer *b)
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{
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struct tty_bufhead *buf = &port->buf;
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/* Dumb strategy for now - should keep some stats */
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WARN_ON(atomic_sub_return(b->size, &buf->mem_used) < 0);
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if (b->size > MIN_TTYB_SIZE)
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kfree(b);
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else if (b->size > 0)
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llist_add(&b->free, &buf->free);
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}
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/**
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* tty_buffer_flush - flush full tty buffers
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* @tty: tty to flush
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* @ld: optional ldisc ptr (must be referenced)
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*
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* flush all the buffers containing receive data. If ld != NULL,
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* flush the ldisc input buffer.
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*
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* Locking: takes buffer lock to ensure single-threaded flip buffer
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* 'consumer'
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*/
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void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld)
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{
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struct tty_port *port = tty->port;
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struct tty_bufhead *buf = &port->buf;
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struct tty_buffer *next;
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atomic_inc(&buf->priority);
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mutex_lock(&buf->lock);
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/* paired w/ release in __tty_buffer_request_room; ensures there are
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* no pending memory accesses to the freed buffer
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*/
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while ((next = smp_load_acquire(&buf->head->next)) != NULL) {
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tty_buffer_free(port, buf->head);
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buf->head = next;
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}
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buf->head->read = buf->head->commit;
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if (ld && ld->ops->flush_buffer)
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ld->ops->flush_buffer(tty);
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atomic_dec(&buf->priority);
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mutex_unlock(&buf->lock);
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}
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/**
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* tty_buffer_request_room - grow tty buffer if needed
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* @tty: tty structure
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* @size: size desired
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* @flags: buffer flags if new buffer allocated (default = 0)
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*
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* Make at least size bytes of linear space available for the tty
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* buffer. If we fail return the size we managed to find.
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*
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* Will change over to a new buffer if the current buffer is encoded as
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* TTY_NORMAL (so has no flags buffer) and the new buffer requires
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* a flags buffer.
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*/
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static int __tty_buffer_request_room(struct tty_port *port, size_t size,
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int flags)
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{
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struct tty_bufhead *buf = &port->buf;
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struct tty_buffer *b, *n;
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int left, change;
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b = buf->tail;
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if (b->flags & TTYB_NORMAL)
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left = 2 * b->size - b->used;
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else
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left = b->size - b->used;
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change = (b->flags & TTYB_NORMAL) && (~flags & TTYB_NORMAL);
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if (change || left < size) {
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/* This is the slow path - looking for new buffers to use */
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n = tty_buffer_alloc(port, size);
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if (n != NULL) {
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n->flags = flags;
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buf->tail = n;
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/* paired w/ acquire in flush_to_ldisc(); ensures
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* flush_to_ldisc() sees buffer data.
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*/
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smp_store_release(&b->commit, b->used);
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/* paired w/ acquire in flush_to_ldisc(); ensures the
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* latest commit value can be read before the head is
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* advanced to the next buffer
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*/
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smp_store_release(&b->next, n);
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} else if (change)
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size = 0;
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else
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size = left;
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}
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return size;
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}
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int tty_buffer_request_room(struct tty_port *port, size_t size)
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{
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return __tty_buffer_request_room(port, size, 0);
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}
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EXPORT_SYMBOL_GPL(tty_buffer_request_room);
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/**
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* tty_insert_flip_string_fixed_flag - Add characters to the tty buffer
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* @port: tty port
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* @chars: characters
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* @flag: flag value for each character
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* @size: size
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*
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* Queue a series of bytes to the tty buffering. All the characters
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* passed are marked with the supplied flag. Returns the number added.
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*/
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int tty_insert_flip_string_fixed_flag(struct tty_port *port,
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const unsigned char *chars, char flag, size_t size)
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{
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int copied = 0;
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do {
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int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
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int flags = (flag == TTY_NORMAL) ? TTYB_NORMAL : 0;
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int space = __tty_buffer_request_room(port, goal, flags);
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struct tty_buffer *tb = port->buf.tail;
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if (unlikely(space == 0))
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break;
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memcpy(char_buf_ptr(tb, tb->used), chars, space);
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if (~tb->flags & TTYB_NORMAL)
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memset(flag_buf_ptr(tb, tb->used), flag, space);
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tb->used += space;
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copied += space;
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chars += space;
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/* There is a small chance that we need to split the data over
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several buffers. If this is the case we must loop */
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} while (unlikely(size > copied));
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return copied;
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}
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EXPORT_SYMBOL(tty_insert_flip_string_fixed_flag);
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/**
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* tty_insert_flip_string_flags - Add characters to the tty buffer
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* @port: tty port
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* @chars: characters
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* @flags: flag bytes
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* @size: size
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*
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* Queue a series of bytes to the tty buffering. For each character
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* the flags array indicates the status of the character. Returns the
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* number added.
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*/
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int tty_insert_flip_string_flags(struct tty_port *port,
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const unsigned char *chars, const char *flags, size_t size)
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{
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int copied = 0;
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do {
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int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
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int space = tty_buffer_request_room(port, goal);
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struct tty_buffer *tb = port->buf.tail;
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if (unlikely(space == 0))
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break;
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memcpy(char_buf_ptr(tb, tb->used), chars, space);
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memcpy(flag_buf_ptr(tb, tb->used), flags, space);
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tb->used += space;
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copied += space;
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chars += space;
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flags += space;
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/* There is a small chance that we need to split the data over
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several buffers. If this is the case we must loop */
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} while (unlikely(size > copied));
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return copied;
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}
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EXPORT_SYMBOL(tty_insert_flip_string_flags);
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/**
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* __tty_insert_flip_char - Add one character to the tty buffer
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* @port: tty port
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* @ch: character
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* @flag: flag byte
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*
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* Queue a single byte to the tty buffering, with an optional flag.
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* This is the slow path of tty_insert_flip_char.
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*/
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int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag)
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{
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struct tty_buffer *tb;
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int flags = (flag == TTY_NORMAL) ? TTYB_NORMAL : 0;
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if (!__tty_buffer_request_room(port, 1, flags))
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return 0;
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tb = port->buf.tail;
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if (~tb->flags & TTYB_NORMAL)
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*flag_buf_ptr(tb, tb->used) = flag;
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*char_buf_ptr(tb, tb->used++) = ch;
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return 1;
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}
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EXPORT_SYMBOL(__tty_insert_flip_char);
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/**
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* tty_schedule_flip - push characters to ldisc
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* @port: tty port to push from
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*
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* Takes any pending buffers and transfers their ownership to the
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* ldisc side of the queue. It then schedules those characters for
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* processing by the line discipline.
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*/
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void tty_schedule_flip(struct tty_port *port)
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{
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struct tty_bufhead *buf = &port->buf;
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/* paired w/ acquire in flush_to_ldisc(); ensures
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* flush_to_ldisc() sees buffer data.
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*/
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smp_store_release(&buf->tail->commit, buf->tail->used);
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queue_work(system_unbound_wq, &buf->work);
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}
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EXPORT_SYMBOL(tty_schedule_flip);
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/**
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* tty_prepare_flip_string - make room for characters
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* @port: tty port
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* @chars: return pointer for character write area
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* @size: desired size
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*
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* Prepare a block of space in the buffer for data. Returns the length
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* available and buffer pointer to the space which is now allocated and
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* accounted for as ready for normal characters. This is used for drivers
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* that need their own block copy routines into the buffer. There is no
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* guarantee the buffer is a DMA target!
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*/
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int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
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size_t size)
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{
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int space = __tty_buffer_request_room(port, size, TTYB_NORMAL);
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if (likely(space)) {
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struct tty_buffer *tb = port->buf.tail;
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*chars = char_buf_ptr(tb, tb->used);
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if (~tb->flags & TTYB_NORMAL)
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memset(flag_buf_ptr(tb, tb->used), TTY_NORMAL, space);
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tb->used += space;
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}
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return space;
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}
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EXPORT_SYMBOL_GPL(tty_prepare_flip_string);
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/**
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* tty_ldisc_receive_buf - forward data to line discipline
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* @ld: line discipline to process input
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* @p: char buffer
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* @f: TTY_* flags buffer
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* @count: number of bytes to process
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*
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* Callers other than flush_to_ldisc() need to exclude the kworker
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* from concurrent use of the line discipline, see paste_selection().
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*
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* Returns the number of bytes processed
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*/
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int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
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char *f, int count)
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{
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if (ld->ops->receive_buf2)
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count = ld->ops->receive_buf2(ld->tty, p, f, count);
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else {
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count = min_t(int, count, ld->tty->receive_room);
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if (count && ld->ops->receive_buf)
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ld->ops->receive_buf(ld->tty, p, f, count);
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}
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return count;
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}
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EXPORT_SYMBOL_GPL(tty_ldisc_receive_buf);
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static int
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receive_buf(struct tty_port *port, struct tty_buffer *head, int count)
|
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{
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unsigned char *p = char_buf_ptr(head, head->read);
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char *f = NULL;
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int n;
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if (~head->flags & TTYB_NORMAL)
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f = flag_buf_ptr(head, head->read);
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n = port->client_ops->receive_buf(port, p, f, count);
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if (n > 0)
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memset(p, 0, n);
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return n;
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}
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/**
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* flush_to_ldisc
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* @work: tty structure passed from work queue.
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*
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* This routine is called out of the software interrupt to flush data
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* from the buffer chain to the line discipline.
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*
|
|
* 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;
|
|
|
|
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(port, head, count);
|
|
if (!count)
|
|
break;
|
|
head->read += count;
|
|
}
|
|
|
|
mutex_unlock(&buf->lock);
|
|
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
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);
|
|
}
|
|
|
|
bool tty_buffer_restart_work(struct tty_port *port)
|
|
{
|
|
return queue_work(system_unbound_wq, &port->buf.work);
|
|
}
|
|
|
|
bool tty_buffer_cancel_work(struct tty_port *port)
|
|
{
|
|
return cancel_work_sync(&port->buf.work);
|
|
}
|
|
|
|
void tty_buffer_flush_work(struct tty_port *port)
|
|
{
|
|
flush_work(&port->buf.work);
|
|
}
|