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authorTakashi Iwai <tiwai@suse.de>2014-10-22 12:04:46 +0200
committerTakashi Iwai <tiwai@suse.de>2014-10-22 12:11:38 +0200
commit63825f3a879ea2be569471643bb6aac73d9261f0 (patch)
tree14f3a5c5579d5036662203b98c061b4ca8492188 /sound/core
parentc37de55efa1ccf018c27b876560725ff5e9f5701 (diff)
ALSA: pcm: Disable mmap for known broken archs
Some architectures like PARISC is known not to support mmap properly with the DMA buffer, where dma_mmap_coherent() returns -EINVAL unconditionally. From the API POV, we should rather drop the mmap support there and expose it before the user-space tries to call mmap. The patch contains again ugly ifdef's, unfortunately, as there is no global flag indicating this. Once when such macro is defined, we can get rid of this instead. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm_native.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index aa6754da7929..dc9a1355a4ab 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -192,6 +192,21 @@ int snd_pcm_info_user(struct snd_pcm_substream *substream,
return err;
}
+static bool hw_support_mmap(struct snd_pcm_substream *substream)
+{
+ if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
+ return false;
+ /* check architectures that return -EINVAL from dma_mmap_coherent() */
+ /* FIXME: this should be some global flag */
+#if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
+ defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
+ if (!substream->ops->mmap &&
+ substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
+ return false;
+#endif
+ return true;
+}
+
#undef RULES_DEBUG
#ifdef RULES_DEBUG
@@ -369,8 +384,12 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
}
hw = &substream->runtime->hw;
- if (!params->info)
+ if (!params->info) {
params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
+ if (!hw_support_mmap(substream))
+ params->info &= ~(SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID);
+ }
if (!params->fifo_size) {
m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
@@ -2069,7 +2088,7 @@ int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
- if (hw->info & SNDRV_PCM_INFO_MMAP) {
+ if (hw_support_mmap(substream)) {
if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)

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