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ALSA: hda: Change AZX_MAX_BUF_SIZE from 1GB to 4MB

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When SND_HDA_PREALLOC_SIZE is set to 0, applications can request as much
memory as there is allowed. With value of AZX_MAX_BUF_SIZE it is 1GB per
stream, which is not realistic use case. Change it 4MB.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=201251#c322
Suggested-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://lore.kernel.org/r/20210318160618.2504068-3-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Amadeusz Sławiński 2021-03-18 17:06:17 +01:00 committed by Takashi Iwai
parent dc85fc9d05
commit 12b2b50830
1 changed files with 6 additions and 2 deletions
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8
include/sound/hda_register.h
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@ -140,8 +140,12 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
#define BDL_SIZE 4096
#define AZX_MAX_BDL_ENTRIES (BDL_SIZE / 16)
#define AZX_MAX_FRAG 32
/* max buffer size - no h/w limit, you can increase as you like */
#define AZX_MAX_BUF_SIZE (1024*1024*1024)
/*
* max buffer size - artificial 4MB limit per stream to avoid big allocations
* In theory it can be really big, but as it is per stream on systems with many streams memory could
* be quickly saturated if userspace requests maximum buffer size for each of them.
*/
#define AZX_MAX_BUF_SIZE (4*1024*1024)
/* RIRB int mask: overrun[2], response[0] */
#define RIRB_INT_RESPONSE 0x01