860115ff61
panic() so that the buffer overflow just beyond this point is always caught, even when the code is not compiled with INVARIANTS. Change chn_setblocksize() buffer reallocation code to attempt to avoid the feed_vchan16() buffer overflow by attempting to always keep the bufsoft buffer at least as large as the bufhard buffer. Print a diagnositic message Danger! %s bufsoft size increasing from %d to %d after CHANNEL_SETBLOCKSIZE() if our best attempts fail. If feed_vchan16() were to be called by the interrupt handler while locks are dropped in chn_setblocksize() to increase the size bufsoft to match the size of bufhard, the panic() code in feed_vchan16() will be triggered. If the diagnostic message is printed, it is a warning that a panic is possible if the system were to see events in an "unlucky" order. Change the locking code to avoid the need for MTX_RECURSIVE mutexes. Add the MTX_DUPOK option to the channel mutexes and change the locking sequence to always lock the parent channel before its children to avoid the possibility of deadlock. Actually implement locking assertions for the channel mutexes and fix the problems found by the resulting assertion violations. Clean up the locking code in dsp_ioctl(). Allocate the channel buffers using the malloc() M_WAITOK option instead of M_NOWAIT so that buffer allocation won't fail. Drop locks across the malloc() calls. Add/modify KASSERTS() in attempt to detect problems early. Abuse layering by adding a pointer to the snd_dbuf structure that points back to the pcm_channel that owns it. This allows sndbuf_resize() to do proper locking without having to change the its API, which is used by the hardware drivers. Don't dereference a NULL pointer when setting hw.snd.maxautovchans if a hardware driver is not loaded. Noticed by Ryan Sommers <ryans at gamersimpact.com>. Tested by: Stefan Ehmann <shoesoft AT gmx.net> Tested by: matk (Mathew Kanner) Tested by: Gordon Bergling <gbergling AT 0xfce3.net>
163 lines
5.4 KiB
C
163 lines
5.4 KiB
C
/*
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* Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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struct pcmchan_children {
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SLIST_ENTRY(pcmchan_children) link;
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struct pcm_channel *channel;
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};
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struct pcmchan_caps {
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u_int32_t minspeed, maxspeed;
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u_int32_t *fmtlist;
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u_int32_t caps;
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};
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#define CHN_NAMELEN 32
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struct pcm_channel {
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kobj_t methods;
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int num;
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pid_t pid;
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int refcount;
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struct pcm_feeder *feeder;
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u_int32_t align;
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int volume;
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u_int32_t speed;
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u_int32_t format;
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u_int32_t flags;
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u_int32_t feederflags;
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u_int32_t blocks;
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int direction;
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unsigned int interrupts, xruns;
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struct snd_dbuf *bufhard, *bufsoft;
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struct snddev_info *parentsnddev;
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struct pcm_channel *parentchannel;
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void *devinfo;
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device_t dev;
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char name[CHN_NAMELEN];
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struct mtx *lock;
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SLIST_HEAD(, pcmchan_children) children;
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};
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#include "channel_if.h"
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int chn_reinit(struct pcm_channel *c);
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int chn_write(struct pcm_channel *c, struct uio *buf);
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int chn_read(struct pcm_channel *c, struct uio *buf);
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u_int32_t chn_start(struct pcm_channel *c, int force);
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int chn_sync(struct pcm_channel *c, int threshold);
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int chn_flush(struct pcm_channel *c);
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int chn_poll(struct pcm_channel *c, int ev, struct thread *td);
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int chn_init(struct pcm_channel *c, void *devinfo, int dir);
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int chn_kill(struct pcm_channel *c);
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int chn_setdir(struct pcm_channel *c, int dir);
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int chn_reset(struct pcm_channel *c, u_int32_t fmt);
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int chn_setvolume(struct pcm_channel *c, int left, int right);
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int chn_setspeed(struct pcm_channel *c, int speed);
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int chn_setformat(struct pcm_channel *c, u_int32_t fmt);
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int chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz);
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int chn_trigger(struct pcm_channel *c, int go);
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int chn_getptr(struct pcm_channel *c);
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struct pcmchan_caps *chn_getcaps(struct pcm_channel *c);
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u_int32_t chn_getformats(struct pcm_channel *c);
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void chn_resetbuf(struct pcm_channel *c);
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void chn_intr(struct pcm_channel *c);
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int chn_wrfeed(struct pcm_channel *c);
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int chn_rdfeed(struct pcm_channel *c);
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int chn_abort(struct pcm_channel *c);
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void chn_wrupdate(struct pcm_channel *c);
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void chn_rdupdate(struct pcm_channel *c);
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int chn_notify(struct pcm_channel *c, u_int32_t flags);
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void chn_lock(struct pcm_channel *c);
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void chn_unlock(struct pcm_channel *c);
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#ifdef USING_MUTEX
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#define CHN_LOCK(c) mtx_lock((struct mtx *)((c)->lock))
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#define CHN_UNLOCK(c) mtx_unlock((struct mtx *)((c)->lock))
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#define CHN_LOCKASSERT(c) mtx_assert((struct mtx *)((c)->lock), MA_OWNED)
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#else
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#define CHN_LOCK(c)
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#define CHN_UNLOCK(c)
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#define CHN_LOCKASSERT(c)
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#endif
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int fmtvalid(u_int32_t fmt, u_int32_t *fmtlist);
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#define PCMDIR_VIRTUAL 2
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#define PCMDIR_PLAY 1
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#define PCMDIR_REC -1
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#define PCMTRIG_START 1
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#define PCMTRIG_EMLDMAWR 2
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#define PCMTRIG_EMLDMARD 3
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#define PCMTRIG_STOP 0
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#define PCMTRIG_ABORT -1
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#define CHN_F_CLOSING 0x00000004 /* a pending close */
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#define CHN_F_ABORTING 0x00000008 /* a pending abort */
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#define CHN_F_RUNNING 0x00000010 /* dma is running */
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#define CHN_F_TRIGGERED 0x00000020
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#define CHN_F_NOTRIGGER 0x00000040
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#define CHN_F_BUSY 0x00001000 /* has been opened */
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#define CHN_F_HAS_SIZE 0x00002000 /* user set block size */
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#define CHN_F_NBIO 0x00004000 /* do non-blocking i/o */
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#define CHN_F_MAPPED 0x00010000 /* has been mmap()ed */
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#define CHN_F_DEAD 0x00020000
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#define CHN_F_BADSETTING 0x00040000
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#define CHN_F_SETBLOCKSIZE 0x00080000
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#define CHN_F_VIRTUAL 0x10000000 /* not backed by hardware */
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#define CHN_F_RESET (CHN_F_BUSY | CHN_F_DEAD | CHN_F_VIRTUAL)
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#define CHN_N_RATE 0x00000001
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#define CHN_N_FORMAT 0x00000002
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#define CHN_N_VOLUME 0x00000004
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#define CHN_N_BLOCKSIZE 0x00000008
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#define CHN_N_TRIGGER 0x00000010
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/*
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* This should be large enough to hold all pcm data between
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* tsleeps in chn_{read,write} at the highest sample rate.
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* (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
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*/
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#define CHN_2NDBUFBLKSIZE (2 * 1024)
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/* The total number of blocks per secondary bufhard. */
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#define CHN_2NDBUFBLKNUM (32)
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/* The size of a whole secondary bufhard. */
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#define CHN_2NDBUFMAXSIZE (131072)
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#define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))
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