This is a note to let you know that I've just added the patch titled
ALSA: hda: Conditionally use snooping for AMD HDMI
to the 6.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-hda-conditionally-use-snooping-for-amd-hdmi.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5568c5266a4576458d6a472372a0a13975e46981
Author: Takashi Iwai <tiwai@xxxxxxx>
Date: Wed Jul 31 19:05:15 2024 +0200
ALSA: hda: Conditionally use snooping for AMD HDMI
[ Upstream commit 478689b5990deb626a0b3f1ebf165979914d6be4 ]
The recent regression report revealed that the use of WC pages for AMD
HDMI device together with AMD IOMMU leads to unexpected truncation or
noises. The issue seems triggered by the change in the kernel core
memory allocation that enables IOMMU driver to use always S/G
buffers. Meanwhile, the use of WC pages has been a workaround for the
similar issue with standard pages in the past. So, now we need to
apply the workaround conditionally, namely, only when IOMMU isn't in
place.
This patch modifies the workaround code to check the DMA ops at first
and apply the snoop-off only when needed.
Fixes: f5ff79fddf0e ("dma-mapping: remove CONFIG_DMA_REMAP")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=219087
Link: https://patch.msgid.link/20240731170521.31714-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/sound/pci/hda/hda_controller.h b/sound/pci/hda/hda_controller.h
index c2d0109866e62..68c883f202ca5 100644
--- a/sound/pci/hda/hda_controller.h
+++ b/sound/pci/hda/hda_controller.h
@@ -28,7 +28,7 @@
#else
#define AZX_DCAPS_I915_COMPONENT 0 /* NOP */
#endif
-/* 14 unused */
+#define AZX_DCAPS_AMD_ALLOC_FIX (1 << 14) /* AMD allocation workaround */
#define AZX_DCAPS_CTX_WORKAROUND (1 << 15) /* X-Fi workaround */
#define AZX_DCAPS_POSFIX_LPIB (1 << 16) /* Use LPIB as default */
#define AZX_DCAPS_AMD_WORKAROUND (1 << 17) /* AMD-specific workaround */
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 3500108f6ba37..87203b819dd47 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -40,6 +40,7 @@
#ifdef CONFIG_X86
/* for snoop control */
+#include <linux/dma-map-ops.h>
#include <asm/set_memory.h>
#include <asm/cpufeature.h>
#endif
@@ -306,7 +307,7 @@ enum {
/* quirks for ATI HDMI with snoop off */
#define AZX_DCAPS_PRESET_ATI_HDMI_NS \
- (AZX_DCAPS_PRESET_ATI_HDMI | AZX_DCAPS_SNOOP_OFF)
+ (AZX_DCAPS_PRESET_ATI_HDMI | AZX_DCAPS_AMD_ALLOC_FIX)
/* quirks for AMD SB */
#define AZX_DCAPS_PRESET_AMD_SB \
@@ -1702,6 +1703,13 @@ static void azx_check_snoop_available(struct azx *chip)
if (chip->driver_caps & AZX_DCAPS_SNOOP_OFF)
snoop = false;
+#ifdef CONFIG_X86
+ /* check the presence of DMA ops (i.e. IOMMU), disable snoop conditionally */
+ if ((chip->driver_caps & AZX_DCAPS_AMD_ALLOC_FIX) &&
+ !get_dma_ops(chip->card->dev))
+ snoop = false;
+#endif
+
chip->snoop = snoop;
if (!snoop) {
dev_info(chip->card->dev, "Force to non-snoop mode\n");
