linux-kernel - [PATCH] MIPS: Fixups of ALSA memory maps

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Date:	Tue, 17 Nov 2009 00:48:14 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>
Cc:	alsa-devel@...a-project.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, Wu Zhangjin <wuzhangjin@...il.com>,
	Wu Zhangjin <wuzj@...ote.com>
Subject: [PATCH] MIPS: Fixups of ALSA memory maps

Hi, All

Seems this is MIPS specific, but it's not that easy to move this patch
into the arch/mips part, So, any better solution?

Thanks & Regards,
       Wu Zhangjin

------------------------

The user application mmap audio dma regions must be dma-coherent. This
patch fix it.

Without this patch, artsd will fail on boot, and mplayer will exit with
"Segmentation fault". (this happens on YeeLoong netbook, fuloong2f
mini pc with snd_cs5535 audio card)

This is originally from the to-mips branch of
http://dev.lemote.com/code/linux_loongson, and contributed by Yanhua
from Lemote Inc.

Reported-by: qiaochong <qiaochong@...il.com>
Signed-off-by: Wu Zhangjin <wuzj@...ote.com>
---
 sound/core/pcm_native.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index ab73edf..2779b9a 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3087,7 +3087,11 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
 			return VM_FAULT_SIGBUS;
 	} else {
 		vaddr = runtime->dma_area + offset;
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+		page = virt_to_page(CAC_ADDR(vaddr));
+#else
 		page = virt_to_page(vaddr);
+#endif
 	}
 	get_page(page);
 	vmf->page = page;
@@ -3202,6 +3206,11 @@ static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
 	if (PCM_RUNTIME_CHECK(substream))
 		return -ENXIO;
 
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+	/* all mmap using uncached mode */
+	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
+	area->vm_flags |= (VM_RESERVED | VM_IO);
+#endif
 	offset = area->vm_pgoff << PAGE_SHIFT;
 	switch (offset) {
 	case SNDRV_PCM_MMAP_OFFSET_STATUS:
-- 
1.6.2.1

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