505 lines
12 KiB
C
505 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ALSA sequencer Memory Manager
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* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
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* Jaroslav Kysela <perex@perex.cz>
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* 2000 by Takashi Iwai <tiwai@suse.de>
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*/
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/mm.h>
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#include <sound/core.h>
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#include <sound/seq_kernel.h>
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#include "seq_memory.h"
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#include "seq_queue.h"
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#include "seq_info.h"
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#include "seq_lock.h"
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static inline int snd_seq_pool_available(struct snd_seq_pool *pool)
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{
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return pool->total_elements - atomic_read(&pool->counter);
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}
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static inline int snd_seq_output_ok(struct snd_seq_pool *pool)
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{
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return snd_seq_pool_available(pool) >= pool->room;
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}
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/*
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* Variable length event:
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* The event like sysex uses variable length type.
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* The external data may be stored in three different formats.
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* 1) kernel space
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* This is the normal case.
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* ext.data.len = length
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* ext.data.ptr = buffer pointer
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* 2) user space
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* When an event is generated via read(), the external data is
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* kept in user space until expanded.
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* ext.data.len = length | SNDRV_SEQ_EXT_USRPTR
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* ext.data.ptr = userspace pointer
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* 3) chained cells
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* When the variable length event is enqueued (in prioq or fifo),
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* the external data is decomposed to several cells.
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* ext.data.len = length | SNDRV_SEQ_EXT_CHAINED
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* ext.data.ptr = the additiona cell head
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* -> cell.next -> cell.next -> ..
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*/
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/*
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* exported:
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* call dump function to expand external data.
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*/
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static int get_var_len(const struct snd_seq_event *event)
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{
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if ((event->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
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return -EINVAL;
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return event->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
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}
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int snd_seq_dump_var_event(const struct snd_seq_event *event,
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snd_seq_dump_func_t func, void *private_data)
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{
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int len, err;
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struct snd_seq_event_cell *cell;
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len = get_var_len(event);
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if (len <= 0)
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return len;
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if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
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char buf[32];
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char __user *curptr = (char __force __user *)event->data.ext.ptr;
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while (len > 0) {
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int size = sizeof(buf);
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if (len < size)
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size = len;
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if (copy_from_user(buf, curptr, size))
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return -EFAULT;
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err = func(private_data, buf, size);
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if (err < 0)
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return err;
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curptr += size;
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len -= size;
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}
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return 0;
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}
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if (!(event->data.ext.len & SNDRV_SEQ_EXT_CHAINED))
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return func(private_data, event->data.ext.ptr, len);
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cell = (struct snd_seq_event_cell *)event->data.ext.ptr;
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for (; len > 0 && cell; cell = cell->next) {
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int size = sizeof(struct snd_seq_event);
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if (len < size)
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size = len;
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err = func(private_data, &cell->event, size);
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if (err < 0)
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return err;
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len -= size;
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}
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return 0;
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}
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EXPORT_SYMBOL(snd_seq_dump_var_event);
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/*
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* exported:
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* expand the variable length event to linear buffer space.
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*/
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static int seq_copy_in_kernel(char **bufptr, const void *src, int size)
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{
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memcpy(*bufptr, src, size);
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*bufptr += size;
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return 0;
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}
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static int seq_copy_in_user(char __user **bufptr, const void *src, int size)
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{
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if (copy_to_user(*bufptr, src, size))
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return -EFAULT;
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*bufptr += size;
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return 0;
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}
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int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
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int in_kernel, int size_aligned)
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{
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int len, newlen;
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int err;
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len = get_var_len(event);
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if (len < 0)
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return len;
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newlen = len;
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if (size_aligned > 0)
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newlen = roundup(len, size_aligned);
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if (count < newlen)
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return -EAGAIN;
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if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
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if (! in_kernel)
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return -EINVAL;
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if (copy_from_user(buf, (void __force __user *)event->data.ext.ptr, len))
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return -EFAULT;
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return newlen;
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}
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err = snd_seq_dump_var_event(event,
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in_kernel ? (snd_seq_dump_func_t)seq_copy_in_kernel :
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(snd_seq_dump_func_t)seq_copy_in_user,
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&buf);
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return err < 0 ? err : newlen;
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}
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EXPORT_SYMBOL(snd_seq_expand_var_event);
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/*
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* release this cell, free extended data if available
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*/
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static inline void free_cell(struct snd_seq_pool *pool,
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struct snd_seq_event_cell *cell)
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{
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cell->next = pool->free;
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pool->free = cell;
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atomic_dec(&pool->counter);
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}
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void snd_seq_cell_free(struct snd_seq_event_cell * cell)
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{
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unsigned long flags;
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struct snd_seq_pool *pool;
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if (snd_BUG_ON(!cell))
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return;
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pool = cell->pool;
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if (snd_BUG_ON(!pool))
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return;
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spin_lock_irqsave(&pool->lock, flags);
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free_cell(pool, cell);
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if (snd_seq_ev_is_variable(&cell->event)) {
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if (cell->event.data.ext.len & SNDRV_SEQ_EXT_CHAINED) {
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struct snd_seq_event_cell *curp, *nextptr;
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curp = cell->event.data.ext.ptr;
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for (; curp; curp = nextptr) {
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nextptr = curp->next;
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curp->next = pool->free;
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free_cell(pool, curp);
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}
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}
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}
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if (waitqueue_active(&pool->output_sleep)) {
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/* has enough space now? */
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if (snd_seq_output_ok(pool))
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wake_up(&pool->output_sleep);
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}
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spin_unlock_irqrestore(&pool->lock, flags);
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}
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/*
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* allocate an event cell.
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*/
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static int snd_seq_cell_alloc(struct snd_seq_pool *pool,
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struct snd_seq_event_cell **cellp,
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int nonblock, struct file *file,
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struct mutex *mutexp)
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{
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struct snd_seq_event_cell *cell;
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unsigned long flags;
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int err = -EAGAIN;
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wait_queue_entry_t wait;
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if (pool == NULL)
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return -EINVAL;
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*cellp = NULL;
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init_waitqueue_entry(&wait, current);
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spin_lock_irqsave(&pool->lock, flags);
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if (pool->ptr == NULL) { /* not initialized */
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pr_debug("ALSA: seq: pool is not initialized\n");
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err = -EINVAL;
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goto __error;
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}
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while (pool->free == NULL && ! nonblock && ! pool->closing) {
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&pool->output_sleep, &wait);
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spin_unlock_irqrestore(&pool->lock, flags);
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if (mutexp)
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mutex_unlock(mutexp);
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schedule();
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if (mutexp)
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mutex_lock(mutexp);
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spin_lock_irqsave(&pool->lock, flags);
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remove_wait_queue(&pool->output_sleep, &wait);
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/* interrupted? */
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if (signal_pending(current)) {
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err = -ERESTARTSYS;
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goto __error;
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}
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}
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if (pool->closing) { /* closing.. */
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err = -ENOMEM;
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goto __error;
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}
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cell = pool->free;
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if (cell) {
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int used;
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pool->free = cell->next;
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atomic_inc(&pool->counter);
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used = atomic_read(&pool->counter);
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if (pool->max_used < used)
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pool->max_used = used;
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pool->event_alloc_success++;
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/* clear cell pointers */
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cell->next = NULL;
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err = 0;
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} else
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pool->event_alloc_failures++;
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*cellp = cell;
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__error:
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spin_unlock_irqrestore(&pool->lock, flags);
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return err;
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}
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/*
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* duplicate the event to a cell.
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* if the event has external data, the data is decomposed to additional
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* cells.
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*/
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int snd_seq_event_dup(struct snd_seq_pool *pool, struct snd_seq_event *event,
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struct snd_seq_event_cell **cellp, int nonblock,
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struct file *file, struct mutex *mutexp)
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{
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int ncells, err;
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unsigned int extlen;
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struct snd_seq_event_cell *cell;
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*cellp = NULL;
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ncells = 0;
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extlen = 0;
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if (snd_seq_ev_is_variable(event)) {
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extlen = event->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
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ncells = DIV_ROUND_UP(extlen, sizeof(struct snd_seq_event));
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}
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if (ncells >= pool->total_elements)
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return -ENOMEM;
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err = snd_seq_cell_alloc(pool, &cell, nonblock, file, mutexp);
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if (err < 0)
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return err;
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/* copy the event */
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cell->event = *event;
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/* decompose */
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if (snd_seq_ev_is_variable(event)) {
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int len = extlen;
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int is_chained = event->data.ext.len & SNDRV_SEQ_EXT_CHAINED;
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int is_usrptr = event->data.ext.len & SNDRV_SEQ_EXT_USRPTR;
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struct snd_seq_event_cell *src, *tmp, *tail;
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char *buf;
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cell->event.data.ext.len = extlen | SNDRV_SEQ_EXT_CHAINED;
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cell->event.data.ext.ptr = NULL;
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src = (struct snd_seq_event_cell *)event->data.ext.ptr;
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buf = (char *)event->data.ext.ptr;
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tail = NULL;
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while (ncells-- > 0) {
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int size = sizeof(struct snd_seq_event);
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if (len < size)
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size = len;
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err = snd_seq_cell_alloc(pool, &tmp, nonblock, file,
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mutexp);
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if (err < 0)
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goto __error;
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if (cell->event.data.ext.ptr == NULL)
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cell->event.data.ext.ptr = tmp;
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if (tail)
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tail->next = tmp;
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tail = tmp;
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/* copy chunk */
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if (is_chained && src) {
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tmp->event = src->event;
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src = src->next;
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} else if (is_usrptr) {
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if (copy_from_user(&tmp->event, (char __force __user *)buf, size)) {
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err = -EFAULT;
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goto __error;
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}
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} else {
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memcpy(&tmp->event, buf, size);
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}
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buf += size;
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len -= size;
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}
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}
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*cellp = cell;
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return 0;
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__error:
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snd_seq_cell_free(cell);
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return err;
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}
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/* poll wait */
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int snd_seq_pool_poll_wait(struct snd_seq_pool *pool, struct file *file,
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poll_table *wait)
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{
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poll_wait(file, &pool->output_sleep, wait);
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return snd_seq_output_ok(pool);
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}
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/* allocate room specified number of events */
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int snd_seq_pool_init(struct snd_seq_pool *pool)
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{
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int cell;
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struct snd_seq_event_cell *cellptr;
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if (snd_BUG_ON(!pool))
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return -EINVAL;
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cellptr = kvmalloc_array(sizeof(struct snd_seq_event_cell), pool->size,
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GFP_KERNEL);
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if (!cellptr)
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return -ENOMEM;
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/* add new cells to the free cell list */
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spin_lock_irq(&pool->lock);
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if (pool->ptr) {
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spin_unlock_irq(&pool->lock);
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kvfree(cellptr);
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return 0;
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}
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pool->ptr = cellptr;
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pool->free = NULL;
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for (cell = 0; cell < pool->size; cell++) {
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cellptr = pool->ptr + cell;
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cellptr->pool = pool;
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cellptr->next = pool->free;
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pool->free = cellptr;
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}
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pool->room = (pool->size + 1) / 2;
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/* init statistics */
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pool->max_used = 0;
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pool->total_elements = pool->size;
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spin_unlock_irq(&pool->lock);
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return 0;
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}
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/* refuse the further insertion to the pool */
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void snd_seq_pool_mark_closing(struct snd_seq_pool *pool)
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{
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unsigned long flags;
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if (snd_BUG_ON(!pool))
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return;
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spin_lock_irqsave(&pool->lock, flags);
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pool->closing = 1;
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spin_unlock_irqrestore(&pool->lock, flags);
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}
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/* remove events */
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int snd_seq_pool_done(struct snd_seq_pool *pool)
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{
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struct snd_seq_event_cell *ptr;
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if (snd_BUG_ON(!pool))
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return -EINVAL;
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/* wait for closing all threads */
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if (waitqueue_active(&pool->output_sleep))
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wake_up(&pool->output_sleep);
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while (atomic_read(&pool->counter) > 0)
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schedule_timeout_uninterruptible(1);
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/* release all resources */
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spin_lock_irq(&pool->lock);
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ptr = pool->ptr;
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pool->ptr = NULL;
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pool->free = NULL;
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pool->total_elements = 0;
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spin_unlock_irq(&pool->lock);
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kvfree(ptr);
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spin_lock_irq(&pool->lock);
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pool->closing = 0;
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spin_unlock_irq(&pool->lock);
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return 0;
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}
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/* init new memory pool */
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struct snd_seq_pool *snd_seq_pool_new(int poolsize)
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{
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struct snd_seq_pool *pool;
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/* create pool block */
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pool = kzalloc(sizeof(*pool), GFP_KERNEL);
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if (!pool)
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return NULL;
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spin_lock_init(&pool->lock);
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pool->ptr = NULL;
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pool->free = NULL;
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pool->total_elements = 0;
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atomic_set(&pool->counter, 0);
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pool->closing = 0;
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init_waitqueue_head(&pool->output_sleep);
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pool->size = poolsize;
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/* init statistics */
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pool->max_used = 0;
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return pool;
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}
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/* remove memory pool */
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int snd_seq_pool_delete(struct snd_seq_pool **ppool)
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{
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struct snd_seq_pool *pool = *ppool;
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*ppool = NULL;
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if (pool == NULL)
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return 0;
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snd_seq_pool_mark_closing(pool);
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snd_seq_pool_done(pool);
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kfree(pool);
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return 0;
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}
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/* exported to seq_clientmgr.c */
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void snd_seq_info_pool(struct snd_info_buffer *buffer,
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struct snd_seq_pool *pool, char *space)
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{
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if (pool == NULL)
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return;
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snd_iprintf(buffer, "%sPool size : %d\n", space, pool->total_elements);
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snd_iprintf(buffer, "%sCells in use : %d\n", space, atomic_read(&pool->counter));
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snd_iprintf(buffer, "%sPeak cells in use : %d\n", space, pool->max_used);
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snd_iprintf(buffer, "%sAlloc success : %d\n", space, pool->event_alloc_success);
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snd_iprintf(buffer, "%sAlloc failures : %d\n", space, pool->event_alloc_failures);
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}
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