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04f8773a3e
linux/sound/pci
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Maciej S. Szmigiero 04f8773a3e ALSA: emu10k1: add a IOMMU workaround 
The Audigy 2 CA0102 chip (but most likely others from the emu10k1 family,
too) has a problem that from time to time it likes to do few DMA reads a
bit beyond its normal allocation and gets very confused if these reads get
blocked by a IOMMU.

For the first (reserved) page this happens multiple times at every
playback, for various synth pages it happens randomly, rarely for PCM
playback buffers and the page table memory itself.
All these reads seem to follow a similar pattern, observed read offsets
beyond the allocation end were 0x00, 0x40, 0x80 and 0xc0 (PCI cache line
multiples), so it looks like the device tries to accesses up to 256 extra
bytes.

As a workaround let's widen these DMA allocations by an extra page if we
detect that the device is behind a non-passthrough IOMMU (the DMA memory
should be relatively plenty on IOMMU systems).

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-02-14 07:46:55 +01:00
..
ac97 scripts/spelling.txt: add "swith" pattern and fix typo instances 2017-02-27 18:43:46 -08:00
ali5451 ALSA: ali5451: constify snd_pcm_ops structures 2017-08-10 17:56:04 +02:00
asihpi ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
au88x0 ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
aw2 ALSA: aw2: make snd_pcm_hardware const 2017-08-12 23:31:39 +02:00
ca0106 ALSA: ca0106: Delete an error message for a failed memory allocation in snd_ca0106_pcm_open_capture_channel() 2017-08-12 23:33:54 +02:00
cs46xx ALSA: cs46xx: make snd_pcm_hardware const 2017-08-12 23:31:41 +02:00
cs5535audio License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ctxfi ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
echoaudio ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
emu10k1 ALSA: emu10k1: add a IOMMU workaround 2018-02-14 07:46:55 +01:00
hda Merge branch 'topic/hda-sync-power' into for-next 2018-02-12 14:01:23 +01:00
ice1712 ALSA: ice1724: Fix resume issues with Prodigy 7.1 HiFi 2017-11-29 09:30:11 +01:00
korg1212 ALSA: korg1212: Delete a duplicate function call "release_firmware" in snd_korg1212_create() 2017-11-29 09:29:41 +01:00
lola ALSA: lola: make snd_pcm_hardware const 2017-08-12 23:31:46 +02:00
lx6464es ALSA: lx6464es: make snd_pcm_hardware const 2017-08-12 23:31:48 +02:00
mixart ALSA: mixart: Delete an error message for a failed memory allocation in snd_mixart_create() 2017-08-12 23:33:20 +02:00
nm256 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
oxygen ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
pcxhr ALSA: pcxhr: make snd_kcontrol_new const 2017-08-16 14:29:07 +02:00
riptide ALSA: riptide: make snd_pcm_hardware const 2017-08-12 23:31:53 +02:00
rme9652 ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
trident ALSA: trident: make snd_pcm_hardware const 2017-08-12 23:31:55 +02:00
vx222 ALSA: vx222: Use container_of() 2017-05-15 11:21:05 +02:00
ymfpci ALSA: ymfpci: Use common error handling code in snd_ymfpci_create() 2017-09-07 10:33:28 +02:00
ad1889.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
ad1889.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ak4531_codec.c ALSA: pci: Drop superfluous ifdef CONFIG_PROC_FS 2015-05-29 08:00:06 +02:00
als300.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
als4000.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
atiixp_modem.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
atiixp.c ALSA: atiixp: constify ac97_pcm structures 2017-08-23 15:53:39 +02:00
azt3328.c ALSA: azt3328: Constify hw_constraints 2017-06-09 10:42:49 +02:00
azt3328.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bt87x.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
cmipci.c ALSA: cmipci: Use common error handling code in snd_cmipci_probe() 2017-08-22 20:06:10 +02:00
cs4281.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
cs5530.c ASoC: sb16: Simplify snd_sb16dsp_pcm() 2015-01-02 16:28:35 +01:00
ens1370.c ALSA: ens137x: remove redundant variable result 2017-10-16 13:36:24 +02:00
ens1371.c
es1938.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
es1968.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
fm801.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
intel8x0.c ALSA: intel8x0: constify ac97_pcm structures 2017-08-23 15:53:40 +02:00
intel8x0m.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
Kconfig ALSA: seq: Allow the modular sequencer registration 2017-06-12 08:43:33 +02:00
maestro3.c ALSA: maestro3: Use common error handling code in two functions 2017-09-07 10:23:47 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rme32.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
rme96.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
sis7019.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
sis7019.h
sonicvibes.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
via82xx_modem.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00
via82xx.c ALSA: pci: make snd_pcm_hardware const 2017-08-12 23:31:58 +02:00