561 lines
16 KiB
C
561 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Helper functions for indirect PCM data transfer to a simple FIFO in
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* hardware (small, no possibility to read "hardware io position",
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* updating position done by interrupt, ...)
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*
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* Copyright (c) by 2007 Joachim Foerster <JOFT@gmx.de>
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*
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* Based on "pcm-indirect.h" (alsa-driver-1.0.13) by
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*
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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* Jaroslav Kysela <perex@suse.cz>
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*/
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/* snd_printk/d() */
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#include <sound/core.h>
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/* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t
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* snd_pcm_period_elapsed() */
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#include <sound/pcm.h>
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#include "pcm-indirect2.h"
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#ifdef SND_PCM_INDIRECT2_STAT
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/* jiffies */
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#include <linux/jiffies.h>
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void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
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struct snd_pcm_indirect2 *rec)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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int i;
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int j;
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int k;
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int seconds = (rec->lastbytetime - rec->firstbytetime) / HZ;
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snd_printk(KERN_DEBUG "STAT: mul_elapsed: %u, mul_elapsed_real: %d, "
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"irq_occurred: %d\n",
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rec->mul_elapsed, rec->mul_elapsed_real, rec->irq_occured);
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snd_printk(KERN_DEBUG "STAT: min_multiple: %d (irqs/period)\n",
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rec->min_multiple);
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snd_printk(KERN_DEBUG "STAT: firstbytetime: %lu, lastbytetime: %lu, "
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"firstzerotime: %lu\n",
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rec->firstbytetime, rec->lastbytetime, rec->firstzerotime);
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snd_printk(KERN_DEBUG "STAT: bytes2hw: %u Bytes => (by runtime->rate) "
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"length: %d s\n",
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rec->bytes2hw, rec->bytes2hw / 2 / 2 / runtime->rate);
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snd_printk(KERN_DEBUG "STAT: (by measurement) length: %d => "
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"rate: %d Bytes/s = %d Frames/s|Hz\n",
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seconds, rec->bytes2hw / seconds,
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rec->bytes2hw / 2 / 2 / seconds);
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snd_printk(KERN_DEBUG
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"STAT: zeros2hw: %u = %d ms ~ %d * %d zero copies\n",
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rec->zeros2hw, ((rec->zeros2hw / 2 / 2) * 1000) /
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runtime->rate,
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rec->zeros2hw / (rec->hw_buffer_size / 2),
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(rec->hw_buffer_size / 2));
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snd_printk(KERN_DEBUG "STAT: pointer_calls: %u, lastdifftime: %u\n",
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rec->pointer_calls, rec->lastdifftime);
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snd_printk(KERN_DEBUG "STAT: sw_io: %d, sw_data: %d\n", rec->sw_io,
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rec->sw_data);
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snd_printk(KERN_DEBUG "STAT: byte_sizes[]:\n");
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k = 0;
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for (j = 0; j < 8; j++) {
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for (i = j * 8; i < (j + 1) * 8; i++)
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if (rec->byte_sizes[i] != 0) {
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snd_printk(KERN_DEBUG "%u: %u",
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i, rec->byte_sizes[i]);
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k++;
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}
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if (((k % 8) == 0) && (k != 0)) {
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snd_printk(KERN_DEBUG "\n");
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k = 0;
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}
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}
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snd_printk(KERN_DEBUG "\n");
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snd_printk(KERN_DEBUG "STAT: zero_sizes[]:\n");
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for (j = 0; j < 8; j++) {
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k = 0;
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for (i = j * 8; i < (j + 1) * 8; i++)
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if (rec->zero_sizes[i] != 0)
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snd_printk(KERN_DEBUG "%u: %u",
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i, rec->zero_sizes[i]);
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else
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k++;
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if (!k)
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snd_printk(KERN_DEBUG "\n");
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}
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snd_printk(KERN_DEBUG "\n");
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snd_printk(KERN_DEBUG "STAT: min_adds[]:\n");
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for (j = 0; j < 8; j++) {
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if (rec->min_adds[j] != 0)
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snd_printk(KERN_DEBUG "%u: %u", j, rec->min_adds[j]);
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}
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snd_printk(KERN_DEBUG "\n");
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snd_printk(KERN_DEBUG "STAT: mul_adds[]:\n");
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for (j = 0; j < 8; j++) {
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if (rec->mul_adds[j] != 0)
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snd_printk(KERN_DEBUG "%u: %u", j, rec->mul_adds[j]);
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}
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snd_printk(KERN_DEBUG "\n");
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snd_printk(KERN_DEBUG
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"STAT: zero_times_saved: %d, zero_times_notsaved: %d\n",
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rec->zero_times_saved, rec->zero_times_notsaved);
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/* snd_printk(KERN_DEBUG "STAT: zero_times[]\n");
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i = 0;
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for (j = 0; j < 3750; j++) {
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if (rec->zero_times[j] != 0) {
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snd_printk(KERN_DEBUG "%u: %u", j, rec->zero_times[j]);
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i++;
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}
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if (((i % 8) == 0) && (i != 0))
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snd_printk(KERN_DEBUG "\n");
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}
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snd_printk(KERN_DEBUG "\n"); */
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return;
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}
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#endif
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/*
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* _internal_ helper function for playback/capture transfer function
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*/
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static void
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snd_pcm_indirect2_increase_min_periods(struct snd_pcm_substream *substream,
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struct snd_pcm_indirect2 *rec,
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int isplay, int iscopy,
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unsigned int bytes)
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{
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if (rec->min_periods >= 0) {
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if (iscopy) {
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rec->sw_io += bytes;
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if (rec->sw_io >= rec->sw_buffer_size)
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rec->sw_io -= rec->sw_buffer_size;
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} else if (isplay) {
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/* If application does not write data in multiples of
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* a period, move sw_data to the next correctly aligned
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* position, so that sw_io can converge to it (in the
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* next step).
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*/
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if (!rec->check_alignment) {
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if (rec->bytes2hw %
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snd_pcm_lib_period_bytes(substream)) {
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unsigned bytes2hw_aligned =
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(1 +
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(rec->bytes2hw /
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snd_pcm_lib_period_bytes
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(substream))) *
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snd_pcm_lib_period_bytes
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(substream);
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rec->sw_data =
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bytes2hw_aligned %
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rec->sw_buffer_size;
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#ifdef SND_PCM_INDIRECT2_STAT
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snd_printk(KERN_DEBUG
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"STAT: @re-align: aligned "
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"bytes2hw to next period "
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"size boundary: %d "
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"(instead of %d)\n",
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bytes2hw_aligned,
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rec->bytes2hw);
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snd_printk(KERN_DEBUG
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"STAT: @re-align: sw_data "
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"moves to: %d\n",
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rec->sw_data);
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#endif
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}
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rec->check_alignment = 1;
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}
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/* We are at the end and are copying zeros into the
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* fifo.
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* Now, we have to make sure that sw_io is increased
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* until the position of sw_data: Filling the fifo with
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* the first zeros means, the last bytes were played.
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*/
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if (rec->sw_io != rec->sw_data) {
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unsigned int diff;
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if (rec->sw_data > rec->sw_io)
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diff = rec->sw_data - rec->sw_io;
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else
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diff = (rec->sw_buffer_size -
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rec->sw_io) +
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rec->sw_data;
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if (bytes >= diff)
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rec->sw_io = rec->sw_data;
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else {
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rec->sw_io += bytes;
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if (rec->sw_io >= rec->sw_buffer_size)
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rec->sw_io -=
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rec->sw_buffer_size;
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}
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}
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}
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rec->min_period_count += bytes;
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if (rec->min_period_count >= (rec->hw_buffer_size / 2)) {
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rec->min_periods += (rec->min_period_count /
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(rec->hw_buffer_size / 2));
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#ifdef SND_PCM_INDIRECT2_STAT
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if ((rec->min_period_count /
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(rec->hw_buffer_size / 2)) > 7)
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snd_printk(KERN_DEBUG
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"STAT: more than 7 (%d) min_adds "
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"at once - too big to save!\n",
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(rec->min_period_count /
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(rec->hw_buffer_size / 2)));
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else
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rec->min_adds[(rec->min_period_count /
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(rec->hw_buffer_size / 2))]++;
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#endif
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rec->min_period_count = (rec->min_period_count %
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(rec->hw_buffer_size / 2));
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}
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} else if (isplay && iscopy)
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rec->min_periods = 0;
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}
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/*
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* helper function for playback/capture pointer callback
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*/
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snd_pcm_uframes_t
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snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
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struct snd_pcm_indirect2 *rec)
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{
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#ifdef SND_PCM_INDIRECT2_STAT
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rec->pointer_calls++;
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#endif
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return bytes_to_frames(substream->runtime, rec->sw_io);
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}
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/*
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* _internal_ helper function for playback interrupt callback
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*/
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static void
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snd_pcm_indirect2_playback_transfer(struct snd_pcm_substream *substream,
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struct snd_pcm_indirect2 *rec,
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snd_pcm_indirect2_copy_t copy,
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snd_pcm_indirect2_zero_t zero)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
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/* runtime->control->appl_ptr: position where ALSA will write next time
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* rec->appl_ptr: position where ALSA was last time
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* diff: obviously ALSA wrote that much bytes into the intermediate
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* buffer since we checked last time
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*/
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snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;
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if (diff) {
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#ifdef SND_PCM_INDIRECT2_STAT
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rec->lastdifftime = jiffies;
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#endif
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if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
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diff += runtime->boundary;
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/* number of bytes "added" by ALSA increases the number of
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* bytes which are ready to "be transferred to HW"/"played"
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* Then, set rec->appl_ptr to not count bytes twice next time.
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*/
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rec->sw_ready += (int)frames_to_bytes(runtime, diff);
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rec->appl_ptr = appl_ptr;
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}
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if (rec->hw_ready && (rec->sw_ready <= 0)) {
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unsigned int bytes;
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#ifdef SND_PCM_INDIRECT2_STAT
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if (rec->firstzerotime == 0) {
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rec->firstzerotime = jiffies;
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snd_printk(KERN_DEBUG
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"STAT: @firstzerotime: mul_elapsed: %d, "
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"min_period_count: %d\n",
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rec->mul_elapsed, rec->min_period_count);
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snd_printk(KERN_DEBUG
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"STAT: @firstzerotime: sw_io: %d, "
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"sw_data: %d, appl_ptr: %u\n",
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rec->sw_io, rec->sw_data,
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(unsigned int)appl_ptr);
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}
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if ((jiffies - rec->firstzerotime) < 3750) {
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rec->zero_times[(jiffies - rec->firstzerotime)]++;
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rec->zero_times_saved++;
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} else
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rec->zero_times_notsaved++;
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#endif
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bytes = zero(substream, rec);
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#ifdef SND_PCM_INDIRECT2_STAT
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rec->zeros2hw += bytes;
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if (bytes < 64)
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rec->zero_sizes[bytes]++;
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else
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snd_printk(KERN_DEBUG
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"STAT: %d zero Bytes copied to hardware at "
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"once - too big to save!\n",
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bytes);
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#endif
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snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 0,
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bytes);
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return;
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}
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while (rec->hw_ready && (rec->sw_ready > 0)) {
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/* sw_to_end: max. number of bytes that can be read/take from
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* the current position (sw_data) in _one_ step
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*/
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unsigned int sw_to_end = rec->sw_buffer_size - rec->sw_data;
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/* bytes: number of bytes we have available (for reading) */
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unsigned int bytes = rec->sw_ready;
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if (sw_to_end < bytes)
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bytes = sw_to_end;
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if (!bytes)
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break;
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#ifdef SND_PCM_INDIRECT2_STAT
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if (rec->firstbytetime == 0)
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rec->firstbytetime = jiffies;
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rec->lastbytetime = jiffies;
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#endif
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/* copy bytes from intermediate buffer position sw_data to the
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* HW and return number of bytes actually written
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* Furthermore, set hw_ready to 0, if the fifo isn't empty
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* now => more could be transferred to fifo
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*/
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bytes = copy(substream, rec, bytes);
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rec->bytes2hw += bytes;
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#ifdef SND_PCM_INDIRECT2_STAT
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if (bytes < 64)
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rec->byte_sizes[bytes]++;
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else
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snd_printk(KERN_DEBUG
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"STAT: %d Bytes copied to hardware at once "
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"- too big to save!\n",
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bytes);
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#endif
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/* increase sw_data by the number of actually written bytes
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* (= number of taken bytes from intermediate buffer)
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*/
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rec->sw_data += bytes;
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if (rec->sw_data == rec->sw_buffer_size)
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rec->sw_data = 0;
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/* now sw_data is the position where ALSA is going to write
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* in the intermediate buffer next time = position we are going
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* to read from next time
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*/
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snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 1,
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bytes);
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/* we read bytes from intermediate buffer, so we need to say
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* that the number of bytes ready for transfer are decreased
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* now
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*/
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rec->sw_ready -= bytes;
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}
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return;
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}
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/*
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* helper function for playback interrupt routine
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*/
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void
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snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
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struct snd_pcm_indirect2 *rec,
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snd_pcm_indirect2_copy_t copy,
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snd_pcm_indirect2_zero_t zero)
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{
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#ifdef SND_PCM_INDIRECT2_STAT
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rec->irq_occured++;
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#endif
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/* hardware played some bytes, so there is room again (in fifo) */
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rec->hw_ready = 1;
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/* don't call ack() now, instead call transfer() function directly
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* (normally called by ack() )
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*/
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snd_pcm_indirect2_playback_transfer(substream, rec, copy, zero);
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if (rec->min_periods >= rec->min_multiple) {
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#ifdef SND_PCM_INDIRECT2_STAT
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if ((rec->min_periods / rec->min_multiple) > 7)
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snd_printk(KERN_DEBUG
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"STAT: more than 7 (%d) mul_adds - too big "
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"to save!\n",
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(rec->min_periods / rec->min_multiple));
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else
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rec->mul_adds[(rec->min_periods /
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rec->min_multiple)]++;
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rec->mul_elapsed_real += (rec->min_periods /
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rec->min_multiple);
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rec->mul_elapsed++;
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#endif
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rec->min_periods = (rec->min_periods % rec->min_multiple);
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snd_pcm_period_elapsed(substream);
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}
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}
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/*
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* _internal_ helper function for capture interrupt callback
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*/
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static void
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snd_pcm_indirect2_capture_transfer(struct snd_pcm_substream *substream,
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struct snd_pcm_indirect2 *rec,
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snd_pcm_indirect2_copy_t copy,
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snd_pcm_indirect2_zero_t null)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
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snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;
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if (diff) {
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#ifdef SND_PCM_INDIRECT2_STAT
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rec->lastdifftime = jiffies;
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#endif
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if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
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diff += runtime->boundary;
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rec->sw_ready -= frames_to_bytes(runtime, diff);
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rec->appl_ptr = appl_ptr;
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}
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/* if hardware has something, but the intermediate buffer is full
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* => skip contents of buffer
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*/
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if (rec->hw_ready && (rec->sw_ready >= (int)rec->sw_buffer_size)) {
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unsigned int bytes;
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#ifdef SND_PCM_INDIRECT2_STAT
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if (rec->firstzerotime == 0) {
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rec->firstzerotime = jiffies;
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snd_printk(KERN_DEBUG "STAT: (capture) "
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"@firstzerotime: mul_elapsed: %d, "
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"min_period_count: %d\n",
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rec->mul_elapsed, rec->min_period_count);
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snd_printk(KERN_DEBUG "STAT: (capture) "
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"@firstzerotime: sw_io: %d, sw_data: %d, "
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"appl_ptr: %u\n",
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rec->sw_io, rec->sw_data,
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(unsigned int)appl_ptr);
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}
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if ((jiffies - rec->firstzerotime) < 3750) {
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rec->zero_times[(jiffies - rec->firstzerotime)]++;
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rec->zero_times_saved++;
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} else
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rec->zero_times_notsaved++;
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#endif
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bytes = null(substream, rec);
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#ifdef SND_PCM_INDIRECT2_STAT
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rec->zeros2hw += bytes;
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if (bytes < 64)
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rec->zero_sizes[bytes]++;
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else
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snd_printk(KERN_DEBUG
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"STAT: (capture) %d zero Bytes copied to "
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"hardware at once - too big to save!\n",
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bytes);
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#endif
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snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 0,
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bytes);
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/* report an overrun */
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rec->sw_io = SNDRV_PCM_POS_XRUN;
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return;
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}
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while (rec->hw_ready && (rec->sw_ready < (int)rec->sw_buffer_size)) {
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/* sw_to_end: max. number of bytes that we can write to the
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* intermediate buffer (until it's end)
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*/
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size_t sw_to_end = rec->sw_buffer_size - rec->sw_data;
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/* bytes: max. number of bytes, which may be copied to the
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* intermediate buffer without overflow (in _one_ step)
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*/
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size_t bytes = rec->sw_buffer_size - rec->sw_ready;
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|
|
|
/* limit number of bytes (for transfer) by available room in
|
|
* the intermediate buffer
|
|
*/
|
|
if (sw_to_end < bytes)
|
|
bytes = sw_to_end;
|
|
if (!bytes)
|
|
break;
|
|
|
|
#ifdef SND_PCM_INDIRECT2_STAT
|
|
if (rec->firstbytetime == 0)
|
|
rec->firstbytetime = jiffies;
|
|
rec->lastbytetime = jiffies;
|
|
#endif
|
|
/* copy bytes from the intermediate buffer (position sw_data)
|
|
* to the HW at most and return number of bytes actually copied
|
|
* from HW
|
|
* Furthermore, set hw_ready to 0, if the fifo is empty now.
|
|
*/
|
|
bytes = copy(substream, rec, bytes);
|
|
rec->bytes2hw += bytes;
|
|
|
|
#ifdef SND_PCM_INDIRECT2_STAT
|
|
if (bytes < 64)
|
|
rec->byte_sizes[bytes]++;
|
|
else
|
|
snd_printk(KERN_DEBUG
|
|
"STAT: (capture) %d Bytes copied to "
|
|
"hardware at once - too big to save!\n",
|
|
bytes);
|
|
#endif
|
|
/* increase sw_data by the number of actually copied bytes from
|
|
* HW
|
|
*/
|
|
rec->sw_data += bytes;
|
|
if (rec->sw_data == rec->sw_buffer_size)
|
|
rec->sw_data = 0;
|
|
|
|
snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 1,
|
|
bytes);
|
|
|
|
/* number of bytes in the intermediate buffer, which haven't
|
|
* been fetched by ALSA yet.
|
|
*/
|
|
rec->sw_ready += bytes;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* helper function for capture interrupt routine
|
|
*/
|
|
void
|
|
snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect2 *rec,
|
|
snd_pcm_indirect2_copy_t copy,
|
|
snd_pcm_indirect2_zero_t null)
|
|
{
|
|
#ifdef SND_PCM_INDIRECT2_STAT
|
|
rec->irq_occured++;
|
|
#endif
|
|
/* hardware recorded some bytes, so there is something to read from the
|
|
* record fifo:
|
|
*/
|
|
rec->hw_ready = 1;
|
|
|
|
/* don't call ack() now, instead call transfer() function directly
|
|
* (normally called by ack() )
|
|
*/
|
|
snd_pcm_indirect2_capture_transfer(substream, rec, copy, null);
|
|
|
|
if (rec->min_periods >= rec->min_multiple) {
|
|
|
|
#ifdef SND_PCM_INDIRECT2_STAT
|
|
if ((rec->min_periods / rec->min_multiple) > 7)
|
|
snd_printk(KERN_DEBUG
|
|
"STAT: more than 7 (%d) mul_adds - "
|
|
"too big to save!\n",
|
|
(rec->min_periods / rec->min_multiple));
|
|
else
|
|
rec->mul_adds[(rec->min_periods /
|
|
rec->min_multiple)]++;
|
|
rec->mul_elapsed_real += (rec->min_periods /
|
|
rec->min_multiple);
|
|
rec->mul_elapsed++;
|
|
#endif
|
|
rec->min_periods = (rec->min_periods % rec->min_multiple);
|
|
snd_pcm_period_elapsed(substream);
|
|
}
|
|
}
|