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The Advanced Linux Sound Architecture (ALSA) - library
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> |
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