/* * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer * * Copyright 2009 Sascha Hauer * * This code is based on code copyrighted by Freescale, * Liam Girdwood, Javier Martin and probably others. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include "imx-pcm.h" static bool filter(struct dma_chan *chan, void *param) { if (!imx_dma_is_general_purpose(chan)) return false; chan->private = param; return true; } static const struct snd_pcm_hardware imx_pcm_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, .buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE, .period_bytes_min = 128, .period_bytes_max = 65535, /* Limited by SDMA engine */ .periods_min = 2, .periods_max = 255, .fifo_size = 0, }; static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = { .pcm_hardware = &imx_pcm_hardware, .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, .compat_filter_fn = filter, .prealloc_buffer_size = IMX_DEFAULT_DMABUF_SIZE, }; int imx_pcm_dma_init(struct platform_device *pdev, size_t size) { struct snd_dmaengine_pcm_config *config; struct snd_pcm_hardware *pcm_hardware; config = devm_kzalloc(&pdev->dev, sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL); if (!config) return -ENOMEM; *config = imx_dmaengine_pcm_config; if (size) config->prealloc_buffer_size = size; pcm_hardware = devm_kzalloc(&pdev->dev, sizeof(struct snd_pcm_hardware), GFP_KERNEL); *pcm_hardware = imx_pcm_hardware; if (size) pcm_hardware->buffer_bytes_max = size; config->pcm_hardware = pcm_hardware; return devm_snd_dmaengine_pcm_register(&pdev->dev, config, SND_DMAENGINE_PCM_FLAG_COMPAT); } EXPORT_SYMBOL_GPL(imx_pcm_dma_init); MODULE_LICENSE("GPL"); ype='hidden' name='id' value='433e19cf33d34bb6751c874a9c00980552fe508c'/>
path: root/sound/pci/cs46xx/dsp_spos.c
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /sound/pci/cs46xx/dsp_spos.c
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/pci/cs46xx/dsp_spos.c')