+++ /dev/null
-// 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);
- }
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff