ALSA: hda - Move snd page allocation to ops

Break out the allocation of pages for DMA and PCM buffers to ops in
the chip structure.  This is done to allow for architecture specific
work-arounds to be added.  Currently mark_pages_wc is used by
hda_intel.  This avoids needing to move that x86-specific code to a
common area shared with hda platform drivers.
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_intel.c

@@ -297,7 +297,10 @@ static char *driver_short_names[] = {
 };
 
 /* for pcm support */
-#define get_azx_dev(substream) (substream->runtime->private_data)
+static inline struct azx_dev *get_azx_dev(struct snd_pcm_substream *substream)
+{
+	return substream->runtime->private_data;
+}
 
 #ifdef CONFIG_X86
 static void __mark_pages_wc(struct azx *chip, struct snd_dma_buffer *dmab, bool on)
@@ -366,15 +369,11 @@ static int azx_alloc_cmd_io(struct azx *chip)
 	int err;
 
 	/* single page (at least 4096 bytes) must suffice for both ringbuffes */
-	err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
-				  chip->card->dev,
+	err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV,
 					 PAGE_SIZE, &chip->rb);
-	if (err < 0) {
+	if (err < 0)
 		dev_err(chip->card->dev, "cannot allocate CORB/RIRB\n");
 	return err;
-	}
-	mark_pages_wc(chip, &chip->rb, true);
-	return 0;
 }
 
 static void azx_init_cmd_io(struct azx *chip)
@@ -1716,26 +1715,18 @@ static int azx_pcm_hw_params(struct snd_pcm_substream *substream,
 {
 	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
 	struct azx *chip = apcm->chip;
-	struct azx_dev *azx_dev = get_azx_dev(substream);
 	int ret;
 
-	dsp_lock(azx_dev);
-	if (dsp_is_locked(azx_dev)) {
+	dsp_lock(get_azx_dev(substream));
+	if (dsp_is_locked(get_azx_dev(substream))) {
 		ret = -EBUSY;
 		goto unlock;
 	}
 
-	mark_runtime_wc(chip, azx_dev, substream, false);
-	azx_dev->bufsize = 0;
-	azx_dev->period_bytes = 0;
-	azx_dev->format_val = 0;
-	ret = snd_pcm_lib_malloc_pages(substream,
+	ret = chip->ops->substream_alloc_pages(chip, substream,
 					       params_buffer_bytes(hw_params));
-	if (ret < 0)
-		goto unlock;
-	mark_runtime_wc(chip, azx_dev, substream, true);
- unlock:
-	dsp_unlock(azx_dev);
+unlock:
+	dsp_unlock(get_azx_dev(substream));
 	return ret;
 }
 
@@ -1745,6 +1736,7 @@ static int azx_pcm_hw_free(struct snd_pcm_substream *substream)
 	struct azx_dev *azx_dev = get_azx_dev(substream);
 	struct azx *chip = apcm->chip;
 	struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
+	int err;
 
 	/* reset BDL address */
 	dsp_lock(azx_dev);
@@ -1759,10 +1751,10 @@ static int azx_pcm_hw_free(struct snd_pcm_substream *substream)
 
 	snd_hda_codec_cleanup(apcm->codec, hinfo, substream);
 
-	mark_runtime_wc(chip, azx_dev, substream, false);
+	err = chip->ops->substream_free_pages(chip, substream);
 	azx_dev->prepared = 0;
 	dsp_unlock(azx_dev);
-	return snd_pcm_lib_free_pages(substream);
+	return err;
 }
 
 static int azx_pcm_prepare(struct snd_pcm_substream *substream)
@@ -2398,13 +2390,11 @@ static int azx_load_dsp_prepare(struct hda_bus *bus, unsigned int format,
 	azx_dev->locked = 1;
 	spin_unlock_irq(&chip->reg_lock);
 
-	err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG,
-				  chip->card->dev,
+	err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV_SG,
 					 byte_size, bufp);
 	if (err < 0)
 		goto err_alloc;
 
-	mark_pages_wc(chip, bufp, true);
 	azx_dev->bufsize = byte_size;
 	azx_dev->period_bytes = byte_size;
 	azx_dev->format_val = format;
@@ -2426,8 +2416,7 @@ static int azx_load_dsp_prepare(struct hda_bus *bus, unsigned int format,
 	return azx_dev->stream_tag;
 
  error:
-	mark_pages_wc(chip, bufp, false);
-	snd_dma_free_pages(bufp);
+	chip->ops->dma_free_pages(chip, bufp);
  err_alloc:
 	spin_lock_irq(&chip->reg_lock);
 	if (azx_dev->opened)
@@ -2469,8 +2458,7 @@ static void azx_load_dsp_cleanup(struct hda_bus *bus,
 	azx_dev->period_bytes = 0;
 	azx_dev->format_val = 0;
 
-	mark_pages_wc(chip, dmab, false);
-	snd_dma_free_pages(dmab);
+	chip->ops->dma_free_pages(chip, dmab);
 	dmab->area = NULL;
 
 	spin_lock_irq(&chip->reg_lock);
@@ -2879,19 +2867,14 @@ static int azx_free(struct azx *chip)
 
 	if (chip->azx_dev) {
 		for (i = 0; i < chip->num_streams; i++)
-			if (chip->azx_dev[i].bdl.area) {
-				mark_pages_wc(chip, &chip->azx_dev[i].bdl, false);
-				snd_dma_free_pages(&chip->azx_dev[i].bdl);
-			}
-	}
-	if (chip->rb.area) {
-		mark_pages_wc(chip, &chip->rb, false);
-		snd_dma_free_pages(&chip->rb);
-	}
-	if (chip->posbuf.area) {
-		mark_pages_wc(chip, &chip->posbuf, false);
-		snd_dma_free_pages(&chip->posbuf);
-	}
+			if (chip->azx_dev[i].bdl.area)
+				chip->ops->dma_free_pages(
+					chip, &chip->azx_dev[i].bdl);
+	}
+	if (chip->rb.area)
+		chip->ops->dma_free_pages(chip, &chip->rb);
+	if (chip->posbuf.area)
+		chip->ops->dma_free_pages(chip, &chip->posbuf);
 	if (chip->region_requested)
 		pci_release_regions(chip->pci);
 	pci_disable_device(chip->pci);
@@ -3343,24 +3326,21 @@ static int azx_first_init(struct azx *chip)
 	for (i = 0; i < chip->num_streams; i++) {
 		dsp_lock_init(&chip->azx_dev[i]);
 		/* allocate memory for the BDL for each stream */
-		err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
-					  chip->card->dev,
-					  BDL_SIZE, &chip->azx_dev[i].bdl);
+		err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV,
+						 BDL_SIZE,
+						 &chip->azx_dev[i].bdl);
 		if (err < 0) {
 			dev_err(card->dev, "cannot allocate BDL\n");
 			return -ENOMEM;
 		}
-		mark_pages_wc(chip, &chip->azx_dev[i].bdl, true);
 	}
 	/* allocate memory for the position buffer */
-	err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
-				  chip->card->dev,
+	err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV,
 					 chip->num_streams * 8, &chip->posbuf);
 	if (err < 0) {
 		dev_err(card->dev, "cannot allocate posbuf\n");
 		return -ENOMEM;
 	}
-	mark_pages_wc(chip, &chip->posbuf, true);
 	/* allocate CORB/RIRB */
 	err = azx_alloc_cmd_io(chip);
 	if (err < 0)
@@ -3479,6 +3459,55 @@ static int disable_msi_reset_irq(struct azx *chip)
 	return 0;
 }
 
+/* DMA page allocation helpers.  */
+static int dma_alloc_pages(struct azx *chip,
+			   int type,
+			   size_t size,
+			   struct snd_dma_buffer *buf)
+{
+	int err;
+
+	err = snd_dma_alloc_pages(type,
+				  chip->card->dev,
+				  size, buf);
+	if (err < 0)
+		return err;
+	mark_pages_wc(chip, buf, true);
+	return 0;
+}
+
+static void dma_free_pages(struct azx *chip, struct snd_dma_buffer *buf)
+{
+	mark_pages_wc(chip, buf, false);
+	snd_dma_free_pages(buf);
+}
+
+static int substream_alloc_pages(struct azx *chip,
+				 struct snd_pcm_substream *substream,
+				 size_t size)
+{
+	struct azx_dev *azx_dev = get_azx_dev(substream);
+	int ret;
+
+	mark_runtime_wc(chip, azx_dev, substream, false);
+	azx_dev->bufsize = 0;
+	azx_dev->period_bytes = 0;
+	azx_dev->format_val = 0;
+	ret = snd_pcm_lib_malloc_pages(substream, size);
+	if (ret < 0)
+		return ret;
+	mark_runtime_wc(chip, azx_dev, substream, true);
+	return 0;
+}
+
+static int substream_free_pages(struct azx *chip,
+				struct snd_pcm_substream *substream)
+{
+	struct azx_dev *azx_dev = get_azx_dev(substream);
+	mark_runtime_wc(chip, azx_dev, substream, false);
+	return snd_pcm_lib_free_pages(substream);
+}
+
 static const struct hda_controller_ops pci_hda_ops = {
 	.writel = pci_azx_writel,
 	.readl = pci_azx_readl,
@@ -3487,6 +3516,10 @@ static const struct hda_controller_ops pci_hda_ops = {
 	.writeb = pci_azx_writeb,
 	.readb = pci_azx_readb,
 	.disable_msi_reset_irq = disable_msi_reset_irq,
+	.dma_alloc_pages = dma_alloc_pages,
+	.dma_free_pages = dma_free_pages,
+	.substream_alloc_pages = substream_alloc_pages,
+	.substream_free_pages = substream_free_pages,
 };
 
 static int azx_probe(struct pci_dev *pci,

sound/pci/hda/hda_priv.h

@@ -298,6 +298,17 @@ struct hda_controller_ops {
 	u8 (*readb)(u8 *addr);
 	/* Disable msi if supported, PCI only */
 	int (*disable_msi_reset_irq)(struct azx *);
+	/* Allocation ops */
+	int (*dma_alloc_pages)(struct azx *chip,
+			       int type,
+			       size_t size,
+			       struct snd_dma_buffer *buf);
+	void (*dma_free_pages)(struct azx *chip, struct snd_dma_buffer *buf);
+	int (*substream_alloc_pages)(struct azx *chip,
+				     struct snd_pcm_substream *substream,
+				     size_t size);
+	int (*substream_free_pages)(struct azx *chip,
+				    struct snd_pcm_substream *substream);
 };
 
 struct azx_pcm {