ASoC: SOF: ipc3-dtrace: Move dtrace related variables local from sof_dev

The variables and structs for DMA trace can be moved local to ipc3-dtrace.c
and the storage can be allocated dynamically, stored behind the
fw_trace_data pointer.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

sound/soc/sof/ipc3-dtrace.c

@@ -15,6 +15,23 @@
 #define TRACE_FILTER_ELEMENTS_PER_ENTRY 4
 #define TRACE_FILTER_MAX_CONFIG_STRING_LENGTH 1024
 
+enum sof_dtrace_state {
+	SOF_DTRACE_DISABLED,
+	SOF_DTRACE_STOPPED,
+	SOF_DTRACE_ENABLED,
+};
+
+struct sof_dtrace_priv {
+	struct snd_dma_buffer dmatb;
+	struct snd_dma_buffer dmatp;
+	int dma_trace_pages;
+	wait_queue_head_t trace_sleep;
+	u32 host_offset;
+	bool dtrace_error;
+	bool dtrace_draining;
+	enum sof_dtrace_state dtrace_state;
+};
+
 static int trace_filter_append_elem(struct snd_sof_dev *sdev, u32 key, u32 value,
 				    struct sof_ipc_trace_filter_elem *elem_list,
 				    int capacity, int *counter)
@@ -227,7 +244,8 @@ static int debugfs_create_trace_filter(struct snd_sof_dev *sdev)
 static size_t sof_dtrace_avail(struct snd_sof_dev *sdev,
 			       loff_t pos, size_t buffer_size)
 {
-	loff_t host_offset = READ_ONCE(sdev->host_offset);
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
+	loff_t host_offset = READ_ONCE(priv->host_offset);
 
 	/*
 	 * If host offset is less than local pos, it means write pointer of
@@ -247,32 +265,33 @@ static size_t sof_dtrace_avail(struct snd_sof_dev *sdev,
 static size_t sof_wait_dtrace_avail(struct snd_sof_dev *sdev, loff_t pos,
 				    size_t buffer_size)
 {
-	wait_queue_entry_t wait;
 	size_t ret = sof_dtrace_avail(sdev, pos, buffer_size);
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
+	wait_queue_entry_t wait;
 
 	/* data immediately available */
 	if (ret)
 		return ret;
 
-	if (sdev->dtrace_state != SOF_DTRACE_ENABLED && sdev->dtrace_draining) {
+	if (priv->dtrace_state != SOF_DTRACE_ENABLED && priv->dtrace_draining) {
 		/*
 		 * tracing has ended and all traces have been
 		 * read by client, return EOF
 		 */
-		sdev->dtrace_draining = false;
+		priv->dtrace_draining = false;
 		return 0;
 	}
 
 	/* wait for available trace data from FW */
 	init_waitqueue_entry(&wait, current);
 	set_current_state(TASK_INTERRUPTIBLE);
-	add_wait_queue(&sdev->trace_sleep, &wait);
+	add_wait_queue(&priv->trace_sleep, &wait);
 
 	if (!signal_pending(current)) {
 		/* set timeout to max value, no error code */
 		schedule_timeout(MAX_SCHEDULE_TIMEOUT);
 	}
-	remove_wait_queue(&sdev->trace_sleep, &wait);
+	remove_wait_queue(&priv->trace_sleep, &wait);
 
 	return sof_dtrace_avail(sdev, pos, buffer_size);
 }
@@ -282,13 +301,14 @@ static ssize_t dfsentry_dtrace_read(struct file *file, char __user *buffer,
 {
 	struct snd_sof_dfsentry *dfse = file->private_data;
 	struct snd_sof_dev *sdev = dfse->sdev;
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
 	unsigned long rem;
 	loff_t lpos = *ppos;
 	size_t avail, buffer_size = dfse->size;
 	u64 lpos_64;
 
 	/* make sure we know about any failures on the DSP side */
-	sdev->dtrace_error = false;
+	priv->dtrace_error = false;
 
 	/* check pos and count */
 	if (lpos < 0)
@@ -302,7 +322,7 @@ static ssize_t dfsentry_dtrace_read(struct file *file, char __user *buffer,
 
 	/* get available count based on current host offset */
 	avail = sof_wait_dtrace_avail(sdev, lpos, buffer_size);
-	if (sdev->dtrace_error) {
+	if (priv->dtrace_error) {
 		dev_err(sdev->dev, "trace IO error\n");
 		return -EIO;
 	}
@@ -317,7 +337,7 @@ static ssize_t dfsentry_dtrace_read(struct file *file, char __user *buffer,
 	 * Note: snd_dma_buffer_sync() is called for normal audio playback and
 	 *	 capture streams also.
 	 */
-	snd_dma_buffer_sync(&sdev->dmatb, SNDRV_DMA_SYNC_CPU);
+	snd_dma_buffer_sync(&priv->dmatb, SNDRV_DMA_SYNC_CPU);
 	/* copy available trace data to debugfs */
 	rem = copy_to_user(buffer, ((u8 *)(dfse->buf) + lpos), count);
 	if (rem)
@@ -333,10 +353,11 @@ static int dfsentry_dtrace_release(struct inode *inode, struct file *file)
 {
 	struct snd_sof_dfsentry *dfse = inode->i_private;
 	struct snd_sof_dev *sdev = dfse->sdev;
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
 
 	/* avoid duplicate traces at next open */
-	if (sdev->dtrace_state != SOF_DTRACE_ENABLED)
-		sdev->host_offset = 0;
+	if (priv->dtrace_state != SOF_DTRACE_ENABLED)
+		priv->host_offset = 0;
 
 	return 0;
 }
@@ -350,12 +371,15 @@ static const struct file_operations sof_dfs_dtrace_fops = {
 
 static int debugfs_create_dtrace(struct snd_sof_dev *sdev)
 {
+	struct sof_dtrace_priv *priv;
 	struct snd_sof_dfsentry *dfse;
 	int ret;
 
 	if (!sdev)
 		return -EINVAL;
 
+	priv = sdev->fw_trace_data;
+
 	ret = debugfs_create_trace_filter(sdev);
 	if (ret < 0)
 		dev_warn(sdev->dev, "failed to create filter debugfs file: %d", ret);
@@ -365,8 +389,8 @@ static int debugfs_create_dtrace(struct snd_sof_dev *sdev)
 		return -ENOMEM;
 
 	dfse->type = SOF_DFSENTRY_TYPE_BUF;
-	dfse->buf = sdev->dmatb.area;
-	dfse->size = sdev->dmatb.bytes;
+	dfse->buf = priv->dmatb.area;
+	dfse->size = priv->dmatb.bytes;
 	dfse->sdev = sdev;
 
 	debugfs_create_file("trace", 0444, sdev->debugfs_root, dfse,
@@ -377,6 +401,7 @@ static int debugfs_create_dtrace(struct snd_sof_dev *sdev)
 
 static int ipc3_dtrace_enable(struct snd_sof_dev *sdev)
 {
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
 	struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
 	struct sof_ipc_fw_version *v = &ready->version;
 	struct sof_ipc_dma_trace_params_ext params;
@@ -386,10 +411,10 @@ static int ipc3_dtrace_enable(struct snd_sof_dev *sdev)
 	if (!sdev->fw_trace_is_supported)
 		return 0;
 
-	if (sdev->dtrace_state == SOF_DTRACE_ENABLED || !sdev->dma_trace_pages)
+	if (priv->dtrace_state == SOF_DTRACE_ENABLED || !priv->dma_trace_pages)
 		return -EINVAL;
 
-	if (sdev->dtrace_state == SOF_DTRACE_STOPPED)
+	if (priv->dtrace_state == SOF_DTRACE_STOPPED)
 		goto start;
 
 	/* set IPC parameters */
@@ -403,15 +428,15 @@ static int ipc3_dtrace_enable(struct snd_sof_dev *sdev)
 		params.hdr.size = sizeof(struct sof_ipc_dma_trace_params);
 		params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS;
 	}
-	params.buffer.phy_addr = sdev->dmatp.addr;
-	params.buffer.size = sdev->dmatb.bytes;
-	params.buffer.pages = sdev->dma_trace_pages;
+	params.buffer.phy_addr = priv->dmatp.addr;
+	params.buffer.size = priv->dmatb.bytes;
+	params.buffer.pages = priv->dma_trace_pages;
 	params.stream_tag = 0;
 
-	sdev->host_offset = 0;
-	sdev->dtrace_draining = false;
+	priv->host_offset = 0;
+	priv->dtrace_draining = false;
 
-	ret = sof_dtrace_host_init(sdev, &sdev->dmatb, &params);
+	ret = sof_dtrace_host_init(sdev, &priv->dmatb, &params);
 	if (ret < 0) {
 		dev_err(sdev->dev, "Host dtrace init failed: %d\n", ret);
 		return ret;
@@ -432,7 +457,7 @@ static int ipc3_dtrace_enable(struct snd_sof_dev *sdev)
 		goto trace_release;
 	}
 
-	sdev->dtrace_state = SOF_DTRACE_ENABLED;
+	priv->dtrace_state = SOF_DTRACE_ENABLED;
 
 	return 0;
 
@@ -443,18 +468,30 @@ static int ipc3_dtrace_enable(struct snd_sof_dev *sdev)
 
 static int ipc3_dtrace_init(struct snd_sof_dev *sdev)
 {
+	struct sof_dtrace_priv *priv;
 	int ret;
 
 	/* dtrace is only supported with SOF_IPC */
 	if (sdev->pdata->ipc_type != SOF_IPC)
 		return -EOPNOTSUPP;
 
+	if (sdev->fw_trace_data) {
+		dev_err(sdev->dev, "fw_trace_data has been already allocated\n");
+		return -EBUSY;
+	}
+
+	priv = devm_kzalloc(sdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	sdev->fw_trace_data = priv;
+
 	/* set false before start initialization */
-	sdev->dtrace_state = SOF_DTRACE_DISABLED;
+	priv->dtrace_state = SOF_DTRACE_DISABLED;
 
 	/* allocate trace page table buffer */
 	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, sdev->dev,
-				  PAGE_SIZE, &sdev->dmatp);
+				  PAGE_SIZE, &priv->dmatp);
 	if (ret < 0) {
 		dev_err(sdev->dev, "can't alloc page table for trace %d\n", ret);
 		return ret;
@@ -463,53 +500,55 @@ static int ipc3_dtrace_init(struct snd_sof_dev *sdev)
 	/* allocate trace data buffer */
 	ret = snd_dma_alloc_dir_pages(SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
 				      DMA_FROM_DEVICE, DMA_BUF_SIZE_FOR_TRACE,
-				      &sdev->dmatb);
+				      &priv->dmatb);
 	if (ret < 0) {
 		dev_err(sdev->dev, "can't alloc buffer for trace %d\n", ret);
 		goto page_err;
 	}
 
 	/* create compressed page table for audio firmware */
-	ret = snd_sof_create_page_table(sdev->dev, &sdev->dmatb,
-					sdev->dmatp.area, sdev->dmatb.bytes);
+	ret = snd_sof_create_page_table(sdev->dev, &priv->dmatb,
+					priv->dmatp.area, priv->dmatb.bytes);
 	if (ret < 0)
 		goto table_err;
 
-	sdev->dma_trace_pages = ret;
+	priv->dma_trace_pages = ret;
 	dev_dbg(sdev->dev, "%s: dma_trace_pages: %d\n", __func__,
-		sdev->dma_trace_pages);
+		priv->dma_trace_pages);
 
 	if (sdev->first_boot) {
 		ret = debugfs_create_dtrace(sdev);
 		if (ret < 0)
 			goto table_err;
 	}
 
-	init_waitqueue_head(&sdev->trace_sleep);
+	init_waitqueue_head(&priv->trace_sleep);
 
 	ret = ipc3_dtrace_enable(sdev);
 	if (ret < 0)
 		goto table_err;
 
 	return 0;
 table_err:
-	sdev->dma_trace_pages = 0;
-	snd_dma_free_pages(&sdev->dmatb);
+	priv->dma_trace_pages = 0;
+	snd_dma_free_pages(&priv->dmatb);
 page_err:
-	snd_dma_free_pages(&sdev->dmatp);
+	snd_dma_free_pages(&priv->dmatp);
 	return ret;
 }
 
 int ipc3_dtrace_posn_update(struct snd_sof_dev *sdev,
 			    struct sof_ipc_dma_trace_posn *posn)
 {
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
+
 	if (!sdev->fw_trace_is_supported)
 		return 0;
 
-	if (sdev->dtrace_state == SOF_DTRACE_ENABLED &&
-	    sdev->host_offset != posn->host_offset) {
-		sdev->host_offset = posn->host_offset;
-		wake_up(&sdev->trace_sleep);
+	if (priv->dtrace_state == SOF_DTRACE_ENABLED &&
+	    priv->host_offset != posn->host_offset) {
+		priv->host_offset = posn->host_offset;
+		wake_up(&priv->trace_sleep);
 	}
 
 	if (posn->overflow != 0)
@@ -523,27 +562,30 @@ int ipc3_dtrace_posn_update(struct snd_sof_dev *sdev,
 /* an error has occurred within the DSP that prevents further trace */
 static void ipc3_dtrace_fw_crashed(struct snd_sof_dev *sdev)
 {
-	if (sdev->dtrace_state == SOF_DTRACE_ENABLED) {
-		sdev->dtrace_error = true;
-		wake_up(&sdev->trace_sleep);
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
+
+	if (priv->dtrace_state == SOF_DTRACE_ENABLED) {
+		priv->dtrace_error = true;
+		wake_up(&priv->trace_sleep);
 	}
 }
 
 static void ipc3_dtrace_release(struct snd_sof_dev *sdev, bool only_stop)
 {
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
 	struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
 	struct sof_ipc_fw_version *v = &ready->version;
 	struct sof_ipc_cmd_hdr hdr;
 	struct sof_ipc_reply ipc_reply;
 	int ret;
 
-	if (!sdev->fw_trace_is_supported || sdev->dtrace_state == SOF_DTRACE_DISABLED)
+	if (!sdev->fw_trace_is_supported || priv->dtrace_state == SOF_DTRACE_DISABLED)
 		return;
 
 	ret = sof_dtrace_host_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
 	if (ret < 0)
 		dev_err(sdev->dev, "Host dtrace trigger stop failed: %d\n", ret);
-	sdev->dtrace_state = SOF_DTRACE_STOPPED;
+	priv->dtrace_state = SOF_DTRACE_STOPPED;
 
 	/*
 	 * stop and free trace DMA in the DSP. TRACE_DMA_FREE is only supported from
@@ -566,11 +608,11 @@ static void ipc3_dtrace_release(struct snd_sof_dev *sdev, bool only_stop)
 	if (ret < 0)
 		dev_err(sdev->dev, "Host dtrace release failed %d\n", ret);
 
-	sdev->dtrace_state = SOF_DTRACE_DISABLED;
+	priv->dtrace_state = SOF_DTRACE_DISABLED;
 
 out:
-	sdev->dtrace_draining = true;
-	wake_up(&sdev->trace_sleep);
+	priv->dtrace_draining = true;
+	wake_up(&priv->trace_sleep);
 }
 
 static void ipc3_dtrace_suspend(struct snd_sof_dev *sdev, pm_message_t pm_state)
@@ -585,13 +627,15 @@ static int ipc3_dtrace_resume(struct snd_sof_dev *sdev)
 
 static void ipc3_dtrace_free(struct snd_sof_dev *sdev)
 {
+	struct sof_dtrace_priv *priv = sdev->fw_trace_data;
+
 	/* release trace */
 	ipc3_dtrace_release(sdev, false);
 
-	if (sdev->dma_trace_pages) {
-		snd_dma_free_pages(&sdev->dmatb);
-		snd_dma_free_pages(&sdev->dmatp);
-		sdev->dma_trace_pages = 0;
+	if (priv->dma_trace_pages) {
+		snd_dma_free_pages(&priv->dmatb);
+		snd_dma_free_pages(&priv->dmatp);
+		priv->dma_trace_pages = 0;
 	}
 }