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22eca6468b
The dmix plugin has some optimized implementations for x86 using the direct memory accesses, which was rather the original version, in addition to the "generic" implementation using the semaphore blocking. The x86 implementation relies on the memory coherency *and* the fast read/write on it. For other architectures, this has been always disabled just because of memory coherency. But, the recent LPE audio development revealed that, even on x86 platforms, the read/write performance might become extremely bad when the buffer is marked as uncached. Some drivers already know the buffer is uncached, we need to switch to the generic mode in such a case. This patch introduces yet another flag to dmix configuration, direct_memory_access, that indicates whether the x86-specific optimization can be used or not. Each driver can set the flag in its cards config namespace, and the default dmix config refers to it. As of this patch, only HDMI LPE Audio driver sets it. Signed-off-by: Takashi Iwai <tiwai@suse.de>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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* optimized mixing code for x86-64
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*/
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#define MIX_AREAS_16 mix_areas_16
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#define MIX_AREAS_32 mix_areas_32
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#define MIX_AREAS_24 mix_areas_24
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#define LOCK_PREFIX ""
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#define XADD "addl"
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#define XSUB "subl"
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#include "pcm_dmix_x86_64.h"
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#undef MIX_AREAS_16
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#undef MIX_AREAS_32
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#undef MIX_AREAS_24
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#undef LOCK_PREFIX
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#undef XADD
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#undef XSUB
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#define MIX_AREAS_16 remix_areas_16
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#define MIX_AREAS_32 remix_areas_32
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#define MIX_AREAS_24 remix_areas_24
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#define LOCK_PREFIX ""
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#define XADD "subl"
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#define XSUB "addl"
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#include "pcm_dmix_x86_64.h"
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#undef MIX_AREAS_16
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#undef MIX_AREAS_32
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#undef MIX_AREAS_24
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#undef LOCK_PREFIX
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#undef XADD
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#undef XSUB
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#define MIX_AREAS_16 mix_areas_16_smp
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#define MIX_AREAS_32 mix_areas_32_smp
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#define MIX_AREAS_24 mix_areas_24_smp
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#define LOCK_PREFIX "lock ; "
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#define XADD "addl"
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#define XSUB "subl"
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#include "pcm_dmix_x86_64.h"
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#undef MIX_AREAS_16
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#undef MIX_AREAS_32
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#undef MIX_AREAS_24
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#undef LOCK_PREFIX
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#undef XADD
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#undef XSUB
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#define MIX_AREAS_16 remix_areas_16_smp
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#define MIX_AREAS_32 remix_areas_32_smp
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#define MIX_AREAS_24 remix_areas_24_smp
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#define LOCK_PREFIX "lock ; "
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#define XADD "subl"
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#define XSUB "addl"
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#include "pcm_dmix_x86_64.h"
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#undef MIX_AREAS_16
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#undef MIX_AREAS_32
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#undef MIX_AREAS_24
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#undef LOCK_PREFIX
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#undef XADD
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#undef XSUB
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#define x86_64_dmix_supported_format \
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((1ULL << SND_PCM_FORMAT_S16_LE) |\
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(1ULL << SND_PCM_FORMAT_S32_LE) |\
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(1ULL << SND_PCM_FORMAT_S24_3LE))
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#define dmix_supported_format \
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(x86_64_dmix_supported_format | generic_dmix_supported_format)
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static void mix_select_callbacks(snd_pcm_direct_t *dmix)
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{
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static int smp = 0;
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if (!dmix->direct_memory_access) {
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generic_mix_select_callbacks(dmix);
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return;
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}
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if (!((1ULL<< dmix->shmptr->s.format) & x86_64_dmix_supported_format)) {
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generic_mix_select_callbacks(dmix);
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return;
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}
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if (!smp) {
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FILE *in;
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char line[255];
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/* try to determine, if we have SMP */
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in = fopen("/proc/cpuinfo", "r");
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if (in) {
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while (!feof(in)) {
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fgets(line, sizeof(line), in);
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if (!strncmp(line, "processor", 9))
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smp++;
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}
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fclose(in);
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}
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}
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// printf("SMP: %i\n", smp);
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dmix->u.dmix.mix_areas_16 = smp > 1 ? mix_areas_16_smp : mix_areas_16;
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dmix->u.dmix.remix_areas_16 = smp > 1 ? remix_areas_16_smp : remix_areas_16;
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dmix->u.dmix.mix_areas_32 = smp > 1 ? mix_areas_32_smp : mix_areas_32;
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dmix->u.dmix.remix_areas_32 = smp > 1 ? remix_areas_32_smp : remix_areas_32;
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dmix->u.dmix.mix_areas_24 = smp > 1 ? mix_areas_24_smp : mix_areas_24;
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dmix->u.dmix.remix_areas_24 = smp > 1 ? remix_areas_24_smp : remix_areas_24;
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}
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