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Sourcecode: alsa-driver version File versions

pcm_compat.c

/*
 *   32bit -> 64bit ioctl wrapper for PCM API
 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

/* This file included from pcm_native.c */

#include <linux/compat.h>

static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
                              s32 __user *src)
{
      snd_pcm_sframes_t delay;
      mm_segment_t fs;
      int err;

      fs = snd_enter_user();
      err = snd_pcm_delay(substream, &delay);
      snd_leave_user(fs);
      if (err < 0)
            return err;
      if (put_user(delay, src))
            return -EFAULT;
      return err;
}

static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
                               u32 __user *src)
{
      snd_pcm_uframes_t frames;
      int err;

      if (get_user(frames, src))
            return -EFAULT;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            err = snd_pcm_playback_rewind(substream, frames);
      else
            err = snd_pcm_capture_rewind(substream, frames);
      if (put_user(err, src))
            return -EFAULT;
      return err < 0 ? err : 0;
}

static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
                               u32 __user *src)
{
      snd_pcm_uframes_t frames;
      int err;

      if (get_user(frames, src))
            return -EFAULT;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            err = snd_pcm_playback_forward(substream, frames);
      else
            err = snd_pcm_capture_forward(substream, frames);
      if (put_user(err, src))
            return -EFAULT;
      return err < 0 ? err : 0;
}

struct snd_pcm_hw_params32 {
      u32 flags;
      struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
      struct snd_mask mres[5];      /* reserved masks */
      struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
      struct snd_interval ires[9];  /* reserved intervals */
      u32 rmask;
      u32 cmask;
      u32 info;
      u32 msbits;
      u32 rate_num;
      u32 rate_den;
      u32 fifo_size;
      unsigned char reserved[64];
};

struct snd_pcm_sw_params32 {
      s32 tstamp_mode;
      u32 period_step;
      u32 sleep_min;
      u32 avail_min;
      u32 xfer_align;
      u32 start_threshold;
      u32 stop_threshold;
      u32 silence_threshold;
      u32 silence_size;
      u32 boundary;
      unsigned char reserved[64];
};

/* recalcuate the boundary within 32bit */
static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
{
      snd_pcm_uframes_t boundary;

      if (! runtime->buffer_size)
            return 0;
      boundary = runtime->buffer_size;
      while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
            boundary *= 2;
      return boundary;
}

static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
                                struct snd_pcm_sw_params32 __user *src)
{
      struct snd_pcm_sw_params params;
      snd_pcm_uframes_t boundary;
      int err;

      memset(&params, 0, sizeof(params));
      if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
          get_user(params.period_step, &src->period_step) ||
          get_user(params.sleep_min, &src->sleep_min) ||
          get_user(params.avail_min, &src->avail_min) ||
          get_user(params.xfer_align, &src->xfer_align) ||
          get_user(params.start_threshold, &src->start_threshold) ||
          get_user(params.stop_threshold, &src->stop_threshold) ||
          get_user(params.silence_threshold, &src->silence_threshold) ||
          get_user(params.silence_size, &src->silence_size))
            return -EFAULT;
      /*
       * Check silent_size parameter.  Since we have 64bit boundary,
       * silence_size must be compared with the 32bit boundary.
       */
      boundary = recalculate_boundary(substream->runtime);
      if (boundary && params.silence_size >= boundary)
            params.silence_size = substream->runtime->boundary;
      err = snd_pcm_sw_params(substream, &params);
      if (err < 0)
            return err;
      if (boundary && put_user(boundary, &src->boundary))
            return -EFAULT;
      return err;
}

struct snd_pcm_channel_info32 {
      u32 channel;
      u32 offset;
      u32 first;
      u32 step;
};

static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
                                   struct snd_pcm_channel_info32 __user *src)
{
      struct snd_pcm_channel_info info;
      int err;

      if (get_user(info.channel, &src->channel) ||
          get_user(info.offset, &src->offset) ||
          get_user(info.first, &src->first) ||
          get_user(info.step, &src->step))
            return -EFAULT;
      err = snd_pcm_channel_info(substream, &info);
      if (err < 0)
            return err;
      if (put_user(info.channel, &src->channel) ||
          put_user(info.offset, &src->offset) ||
          put_user(info.first, &src->first) ||
          put_user(info.step, &src->step))
            return -EFAULT;
      return err;
}

struct snd_pcm_status32 {
      s32 state;
      struct compat_timespec trigger_tstamp;
      struct compat_timespec tstamp;
      u32 appl_ptr;
      u32 hw_ptr;
      s32 delay;
      u32 avail;
      u32 avail_max;
      u32 overrange;
      s32 suspended_state;
      unsigned char reserved[60];
} __attribute__((packed));


static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
                              struct snd_pcm_status32 __user *src)
{
      struct snd_pcm_status status;
      int err;

      err = snd_pcm_status(substream, &status);
      if (err < 0)
            return err;

      if (put_user(status.state, &src->state) ||
          put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
          put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||
          put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
          put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
          put_user(status.appl_ptr, &src->appl_ptr) ||
          put_user(status.hw_ptr, &src->hw_ptr) ||
          put_user(status.delay, &src->delay) ||
          put_user(status.avail, &src->avail) ||
          put_user(status.avail_max, &src->avail_max) ||
          put_user(status.overrange, &src->overrange) ||
          put_user(status.suspended_state, &src->suspended_state))
            return -EFAULT;

      return err;
}

/* both for HW_PARAMS and HW_REFINE */
static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
                                int refine, 
                                struct snd_pcm_hw_params32 __user *data32)
{
      struct snd_pcm_hw_params *data;
      struct snd_pcm_runtime *runtime;
      int err;

      if (! (runtime = substream->runtime))
            return -ENOTTY;

      data = kmalloc(sizeof(*data), GFP_KERNEL);
      if (data == NULL)
            return -ENOMEM;
      /* only fifo_size is different, so just copy all */
      if (copy_from_user(data, data32, sizeof(*data32))) {
            err = -EFAULT;
            goto error;
      }
      if (refine)
            err = snd_pcm_hw_refine(substream, data);
      else
            err = snd_pcm_hw_params(substream, data);
      if (err < 0)
            goto error;
      if (copy_to_user(data32, data, sizeof(*data32)) ||
          put_user(data->fifo_size, &data32->fifo_size)) {
            err = -EFAULT;
            goto error;
      }

      if (! refine) {
            unsigned int new_boundary = recalculate_boundary(runtime);
            if (new_boundary)
                  runtime->boundary = new_boundary;
      }
 error:
      kfree(data);
      return err;
}


/*
 */
struct snd_xferi32 {
      s32 result;
      u32 buf;
      u32 frames;
};

static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
                              int dir, struct snd_xferi32 __user *data32)
{
      compat_caddr_t buf;
      u32 frames;
      int err;

      if (! substream->runtime)
            return -ENOTTY;
      if (substream->stream != dir)
            return -EINVAL;
      if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;

      if (get_user(buf, &data32->buf) ||
          get_user(frames, &data32->frames))
            return -EFAULT;

      if (dir == SNDRV_PCM_STREAM_PLAYBACK)
            err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
      else
            err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
      if (err < 0)
            return err;
      /* copy the result */
      if (put_user(err, &data32->result))
            return -EFAULT;
      return 0;
}


/* snd_xfern needs remapping of bufs */
struct snd_xfern32 {
      s32 result;
      u32 bufs;  /* this is void **; */
      u32 frames;
};

/*
 * xfern ioctl nees to copy (up to) 128 pointers on stack.
 * although we may pass the copied pointers through f_op->ioctl, but the ioctl
 * handler there expands again the same 128 pointers on stack, so it is better
 * to handle the function (calling pcm_readv/writev) directly in this handler.
 */
static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
                              int dir, struct snd_xfern32 __user *data32)
{
      compat_caddr_t buf;
      compat_caddr_t __user *bufptr;
      u32 frames;
      void __user **bufs;
      int err, ch, i;

      if (! substream->runtime)
            return -ENOTTY;
      if (substream->stream != dir)
            return -EINVAL;

      if ((ch = substream->runtime->channels) > 128)
            return -EINVAL;
      if (get_user(buf, &data32->bufs) ||
          get_user(frames, &data32->frames))
            return -EFAULT;
      bufptr = compat_ptr(buf);
      bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL);
      if (bufs == NULL)
            return -ENOMEM;
      for (i = 0; i < ch; i++) {
            u32 ptr;
            if (get_user(ptr, bufptr)) {
                  kfree(bufs);
                  return -EFAULT;
            }
            bufs[ch] = compat_ptr(ptr);
            bufptr++;
      }
      if (dir == SNDRV_PCM_STREAM_PLAYBACK)
            err = snd_pcm_lib_writev(substream, bufs, frames);
      else
            err = snd_pcm_lib_readv(substream, bufs, frames);
      if (err >= 0) {
            if (put_user(err, &data32->result))
                  err = -EFAULT;
      }
      kfree(bufs);
      return err;
}


struct snd_pcm_mmap_status32 {
      s32 state;
      s32 pad1;
      u32 hw_ptr;
      struct compat_timespec tstamp;
      s32 suspended_state;
} __attribute__((packed));

struct snd_pcm_mmap_control32 {
      u32 appl_ptr;
      u32 avail_min;
};

struct snd_pcm_sync_ptr32 {
      u32 flags;
      union {
            struct snd_pcm_mmap_status32 status;
            unsigned char reserved[64];
      } s;
      union {
            struct snd_pcm_mmap_control32 control;
            unsigned char reserved[64];
      } c;
} __attribute__((packed));

static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
                               struct snd_pcm_sync_ptr32 __user *src)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      volatile struct snd_pcm_mmap_status *status;
      volatile struct snd_pcm_mmap_control *control;
      u32 sflags;
      struct snd_pcm_mmap_control scontrol;
      struct snd_pcm_mmap_status sstatus;
      snd_pcm_uframes_t boundary;
      int err;

      snd_assert(runtime, return -EINVAL);

      if (get_user(sflags, &src->flags) ||
          get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
          get_user(scontrol.avail_min, &src->c.control.avail_min))
            return -EFAULT;
      if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
            err = snd_pcm_hwsync(substream);
            if (err < 0)
                  return err;
      }
      status = runtime->status;
      control = runtime->control;
      boundary = recalculate_boundary(runtime);
      if (! boundary)
            boundary = 0x7fffffff;
      snd_pcm_stream_lock_irq(substream);
      /* FIXME: we should consider the boundary for the sync from app */
      if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
            control->appl_ptr = scontrol.appl_ptr;
      else
            scontrol.appl_ptr = control->appl_ptr % boundary;
      if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
            control->avail_min = scontrol.avail_min;
      else
            scontrol.avail_min = control->avail_min;
      sstatus.state = status->state;
      sstatus.hw_ptr = status->hw_ptr % boundary;
      sstatus.tstamp = status->tstamp;
      sstatus.suspended_state = status->suspended_state;
      snd_pcm_stream_unlock_irq(substream);
      if (put_user(sstatus.state, &src->s.status.state) ||
          put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
          put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp.tv_sec) ||
          put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp.tv_nsec) ||
          put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
          put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
          put_user(scontrol.avail_min, &src->c.control.avail_min))
            return -EFAULT;

      return 0;
}


/*
 */
enum {
      SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
      SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
      SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
      SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
      SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
      SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
      SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
      SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
      SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
      SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
      SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
      SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
      SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),

};

static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      void __user *argp = compat_ptr(arg);

      pcm_file = file->private_data;
      if (! pcm_file)
            return -ENOTTY;
      substream = pcm_file->substream;
      if (! substream)
            return -ENOTTY;

      /*
       * When PCM is used on 32bit mode, we need to disable
       * mmap of PCM status/control records because of the size
       * incompatibility.
       */
      pcm_file->no_compat_mmap = 1;

      switch (cmd) {
      case SNDRV_PCM_IOCTL_PVERSION:
      case SNDRV_PCM_IOCTL_INFO:
      case SNDRV_PCM_IOCTL_TSTAMP:
      case SNDRV_PCM_IOCTL_TTSTAMP:
      case SNDRV_PCM_IOCTL_HWSYNC:
      case SNDRV_PCM_IOCTL_PREPARE:
      case SNDRV_PCM_IOCTL_RESET:
      case SNDRV_PCM_IOCTL_START:
      case SNDRV_PCM_IOCTL_DROP:
      case SNDRV_PCM_IOCTL_DRAIN:
      case SNDRV_PCM_IOCTL_PAUSE:
      case SNDRV_PCM_IOCTL_HW_FREE:
      case SNDRV_PCM_IOCTL_RESUME:
      case SNDRV_PCM_IOCTL_XRUN:
      case SNDRV_PCM_IOCTL_LINK:
      case SNDRV_PCM_IOCTL_UNLINK:
            if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                  return snd_pcm_playback_ioctl1(file, substream, cmd, argp);
            else
                  return snd_pcm_capture_ioctl1(file, substream, cmd, argp);
      case SNDRV_PCM_IOCTL_HW_REFINE32:
            return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
      case SNDRV_PCM_IOCTL_HW_PARAMS32:
            return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
      case SNDRV_PCM_IOCTL_SW_PARAMS32:
            return snd_pcm_ioctl_sw_params_compat(substream, argp);
      case SNDRV_PCM_IOCTL_STATUS32:
            return snd_pcm_status_user_compat(substream, argp);
      case SNDRV_PCM_IOCTL_SYNC_PTR32:
            return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
      case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
            return snd_pcm_ioctl_channel_info_compat(substream, argp);
      case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
            return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
      case SNDRV_PCM_IOCTL_READI_FRAMES32:
            return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
      case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
            return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
      case SNDRV_PCM_IOCTL_READN_FRAMES32:
            return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
      case SNDRV_PCM_IOCTL_DELAY32:
            return snd_pcm_ioctl_delay_compat(substream, argp);
      case SNDRV_PCM_IOCTL_REWIND32:
            return snd_pcm_ioctl_rewind_compat(substream, argp);
      case SNDRV_PCM_IOCTL_FORWARD32:
            return snd_pcm_ioctl_forward_compat(substream, argp);
      }

      return -ENOIOCTLCMD;
}

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