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alistair23-linux/sound/drivers/pcm-indirect2.c
Thomas Gleixner 74ba9207e1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 
Based on 1 normalized pattern(s):

  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
  675 mass ave cambridge ma 02139 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 441 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:36:45 +02:00

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