user/sven/linux.git/include/sound/memalloc.h, branch v3.10.44

ALSA: memalloc.h - fix wrong truncation of dma_addr_t

2013-12-20T15:45:06Z

commit 932e9dec380c67ec15ac3eb073bb55797d8b4801 upstream. When running a 32bit kernel the hda_intel driver is still reporting a 64bit dma_mask if the HW supports it. From sound/pci/hda/hda_intel.c: /* allow 64bit DMA address if supported by H/W */ if ((gcap & ICH6_GCAP_64OK) && !pci_set_dma_mask(pci, DMA_BIT_MASK(64))) pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(64)); else { pci_set_dma_mask(pci, DMA_BIT_MASK(32)); pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32)); } which means when there is a call to dma_alloc_coherent from snd_malloc_dev_pages a machine address bigger than 32bit can be returned. This can be true in particular if running the 32bit kernel as a pv dom0 under the Xen Hypervisor or PAE on bare metal. The problem is that when calling setup_bdle to program the BLE the dma_addr_t returned from the dma_alloc_coherent is wrongly truncated from snd_sgbuf_get_addr if running a 32bit kernel: static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset) { struct snd_sg_buf *sgbuf = dmab->private_data; dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; addr &= PAGE_MASK; return addr + offset % PAGE_SIZE; } where PAGE_MASK in a 32bit kernel is zeroing the upper 32bit af addr. Without this patch the HW will fetch the 32bit truncated address, which is not the one obtained from dma_alloc_coherent and will result to a non working audio but can corrupt host memory at a random location. The current patch apply to v3.13-rc3-74-g6c843f5 Signed-off-by: Stefano Panella Reviewed-by: Frediano Ziglio Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman

ALSA: Force a cast to silence a warning from "sparse"

2013-01-29T14:08:43Z

Some audio drivers are calling snd_dma_continuous_data(GFP_KERNEL) which makes "sparse" give a warning: $ make C=2 M=sound/usb modules ... sound/usb/6fire/pcm.c:625:25: warning: cast from restricted gfp_t sound/usb/caiaq/audio.c:845:41: warning: cast from restricted gfp_t sound/usb/usx2y/usbusx2yaudio.c:997:54: warning: cast from restricted gfp_t sound/usb/usx2y/usbusx2yaudio.c:1001:54: warning: cast from restricted gfp_t sound/usb/usx2y/usx2yhwdeppcm.c:774:54: warning: cast from restricted gfp_t sound/usb/usx2y/usx2yhwdeppcm.c:778:54: warning: cast from restricted gfp_t Add __force to the cast to silence the warning. Signed-off-by: Antonio Ospite Signed-off-by: Takashi Iwai

ALSA: Make snd_sgbuf_get_{ptr|addr}() available for non-SG cases

2012-09-23T09:24:42Z

Passing struct snd_dma_buffer pointer instead, so that they work no matter whether real SG buffer is used or not. This is a preliminary work for the HD-audio DSP loader code. Signed-off-by: Ian Minett Signed-off-by: Takashi Iwai

ALSA: Fix SG-buffer DMA with non-coherent architectures

2009-07-08T12:20:20Z

Using SG-buffers with dma_alloc_coherent() is often very inefficient on non-coherent architectures because a tracking record could be allocated in addition for each dma_alloc_coherent() call. Instead, simply disable SG-buffers but just allocate normal continuous buffers on non-supported (currently all but x86) architectures. Signed-off-by: Takashi Iwai

Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6

2008-10-11T19:39:35Z

Conflicts: sound/core/memalloc.c

alsa: Remove special SBUS dma support code.

2008-08-29T09:14:58Z

No longer used. Signed-off-by: David S. Miller

ALSA: Allocate larger pages in sgbuf

2008-08-25T07:57:38Z

Most hardwares have limited buffer-descriptor table length. This also restricts the max buffer size of the sound driver. For example, snd-hda-intel has 1MB buffer size limit, and this is because it can have at most 256 BDL entries. For supporting larger buffers, we need to allocate larger pages even for sg-buffers. This patch changes the sgbuf allocation code to try to allocate larger pages first. At each head of the allocated pages, the number of allocated pages is stored in the lowest bits of the corresponding entry of the table addr field. This change isn't visible as long as the driver uses snd_sgbuf_get_addr() helper. Also, the patch adds a new function, snd_pcm_sgbuf_get_chunk_size(). This returns the size of the chunk on continuous pages starting at the given position offset. If the chunk reaches to a non-continuous page, it returns the size to the boundary. Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela

ALSA: Clean up SG-buffer helper functions and macros

2008-08-25T07:57:18Z

Clean up SG-buffer helper functions and macros. Helpers take substream as arguments now. Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela

[ALSA] Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz

2007-10-16T14:51:18Z

Signed-off-by: Jaroslav Kysela

[PATCH] gfp_t: sound

2005-10-28T15:16:50Z

Signed-off-by: Al Viro Signed-off-by: Linus Torvalds