ALSA: mips: Convert to the common vmalloc memalloc

The recent change (*) in the ALSA memalloc core allows us to drop the
special vmalloc-specific allocation and page handling.  This patch
coverts to the common code.
(*) 1fe7f39: ALSA: memalloc: Add vmalloc buffer allocation
                  support
    7e8edae: ALSA: pcm: Handle special page mapping in the
                  default mmap handler

Link: https://lore.kernel.org/r/20191105151856.10785-18-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/mips/sgio2audio.c

@@ -582,14 +582,13 @@ static int snd_sgio2audio_pcm_close(struct snd_pcm_substream *substream)
 static int snd_sgio2audio_pcm_hw_params(struct snd_pcm_substream *substream,
 					struct snd_pcm_hw_params *hw_params)
 {
-	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
-						params_buffer_bytes(hw_params));
+	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 }
 
 /* hw_free callback */
 static int snd_sgio2audio_pcm_hw_free(struct snd_pcm_substream *substream)
 {
-	return snd_pcm_lib_free_vmalloc_buffer(substream);
+	return snd_pcm_lib_free_pages(substream);
 }
 
 /* prepare callback */
@@ -670,7 +669,6 @@ static const struct snd_pcm_ops snd_sgio2audio_playback1_ops = {
 	.prepare =     snd_sgio2audio_pcm_prepare,
 	.trigger =     snd_sgio2audio_pcm_trigger,
 	.pointer =     snd_sgio2audio_pcm_pointer,
-	.page =        snd_pcm_lib_get_vmalloc_page,
 };
 
 static const struct snd_pcm_ops snd_sgio2audio_playback2_ops = {
@@ -682,7 +680,6 @@ static const struct snd_pcm_ops snd_sgio2audio_playback2_ops = {
 	.prepare =     snd_sgio2audio_pcm_prepare,
 	.trigger =     snd_sgio2audio_pcm_trigger,
 	.pointer =     snd_sgio2audio_pcm_pointer,
-	.page =        snd_pcm_lib_get_vmalloc_page,
 };
 
 static const struct snd_pcm_ops snd_sgio2audio_capture_ops = {
@@ -694,7 +691,6 @@ static const struct snd_pcm_ops snd_sgio2audio_capture_ops = {
 	.prepare =     snd_sgio2audio_pcm_prepare,
 	.trigger =     snd_sgio2audio_pcm_trigger,
 	.pointer =     snd_sgio2audio_pcm_pointer,
-	.page =        snd_pcm_lib_get_vmalloc_page,
 };
 
 /*
@@ -720,6 +716,8 @@ static int snd_sgio2audio_new_pcm(struct snd_sgio2audio *chip)
 			&snd_sgio2audio_playback1_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 			&snd_sgio2audio_capture_ops);
+	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_VMALLOC,
+					      NULL, 0, 0);
 
 	/* create second  pcm device with one outputs and no input */
 	err = snd_pcm_new(chip->card, "SGI O2 Audio", 1, 1, 0, &pcm);
@@ -732,6 +730,8 @@ static int snd_sgio2audio_new_pcm(struct snd_sgio2audio *chip)
 	/* set operators */
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 			&snd_sgio2audio_playback2_ops);
+	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_VMALLOC,
+					      NULL, 0, 0);
 
 	return 0;
 }