cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hda-trace.c (2706B)

      1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
      2//
      3// This file is provided under a dual BSD/GPLv2 license.  When using or
      4// redistributing this file, you may do so under either license.
      5//
      6// Copyright(c) 2018 Intel Corporation. All rights reserved.
      7//
      8// Authors: Liam Girdwood <liam.r.girdwood@linux.intel.com>
      9//	    Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
     10//	    Rander Wang <rander.wang@intel.com>
     11//          Keyon Jie <yang.jie@linux.intel.com>
     12//
     13
     14/*
     15 * Hardware interface for generic Intel audio DSP HDA IP
     16 */
     17
     18#include <sound/hdaudio_ext.h>
     19#include "../ops.h"
     20#include "hda.h"
     21
     22static int hda_dsp_trace_prepare(struct snd_sof_dev *sdev, struct snd_dma_buffer *dmab)
     23{
     24	struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
     25	struct hdac_ext_stream *hext_stream = hda->dtrace_stream;
     26	struct hdac_stream *hstream = &hext_stream->hstream;
     27	int ret;
     28
     29	hstream->period_bytes = 0;/* initialize period_bytes */
     30	hstream->bufsize = dmab->bytes;
     31
     32	ret = hda_dsp_stream_hw_params(sdev, hext_stream, dmab, NULL);
     33	if (ret < 0)
     34		dev_err(sdev->dev, "error: hdac prepare failed: %d\n", ret);
     35
     36	return ret;
     37}
     38
     39int hda_dsp_trace_init(struct snd_sof_dev *sdev, struct snd_dma_buffer *dmab,
     40		       struct sof_ipc_dma_trace_params_ext *dtrace_params)
     41{
     42	struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
     43	int ret;
     44
     45	hda->dtrace_stream = hda_dsp_stream_get(sdev, SNDRV_PCM_STREAM_CAPTURE,
     46						SOF_HDA_STREAM_DMI_L1_COMPATIBLE);
     47
     48	if (!hda->dtrace_stream) {
     49		dev_err(sdev->dev,
     50			"error: no available capture stream for DMA trace\n");
     51		return -ENODEV;
     52	}
     53
     54	dtrace_params->stream_tag = hda->dtrace_stream->hstream.stream_tag;
     55
     56	/*
     57	 * initialize capture stream, set BDL address and return corresponding
     58	 * stream tag which will be sent to the firmware by IPC message.
     59	 */
     60	ret = hda_dsp_trace_prepare(sdev, dmab);
     61	if (ret < 0) {
     62		dev_err(sdev->dev, "error: hdac trace init failed: %d\n", ret);
     63		hda_dsp_stream_put(sdev, SNDRV_PCM_STREAM_CAPTURE,
     64				   dtrace_params->stream_tag);
     65		hda->dtrace_stream = NULL;
     66		dtrace_params->stream_tag = 0;
     67	}
     68
     69	return ret;
     70}
     71
     72int hda_dsp_trace_release(struct snd_sof_dev *sdev)
     73{
     74	struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
     75	struct hdac_stream *hstream;
     76
     77	if (hda->dtrace_stream) {
     78		hstream = &hda->dtrace_stream->hstream;
     79		hda_dsp_stream_put(sdev,
     80				   SNDRV_PCM_STREAM_CAPTURE,
     81				   hstream->stream_tag);
     82		hda->dtrace_stream = NULL;
     83		return 0;
     84	}
     85
     86	dev_dbg(sdev->dev, "DMA trace stream is not opened!\n");
     87	return -ENODEV;
     88}
     89
     90int hda_dsp_trace_trigger(struct snd_sof_dev *sdev, int cmd)
     91{
     92	struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
     93
     94	return hda_dsp_stream_trigger(sdev, hda->dtrace_stream, cmd);
     95}