ASoC: Intel: Skylake: Use SG allocation for SKL-based firmware load

Resign from ->alloc_dma_buf() and use snd_dma_alloc_pages() directly.
For data i.e.: base firmware binary transfer, make use of SG allocation
to better adapt to memory-limited environment. For BDL descriptor, given
its small size this is not required.
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Tested-by: Lukasz Majczak <lma@semihlaf.com>
Link: https://lore.kernel.org/r/20221205085330.857665-7-cezary.rojewski@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl-sst-cldma.c

@@ -11,6 +11,7 @@
 #include <linux/io.h>
 #include <linux/mm.h>
 #include <linux/delay.h>
+#include <sound/hda_register.h>
 #include "../common/sst-dsp.h"
 #include "../common/sst-dsp-priv.h"
 
@@ -79,21 +80,25 @@ static void skl_cldma_setup_bdle(struct sst_dsp *ctx,
 		__le32 **bdlp, int size, int with_ioc)
 {
 	__le32 *bdl = *bdlp;
+	int remaining = ctx->cl_dev.bufsize;
+	int offset = 0;
 
 	ctx->cl_dev.frags = 0;
-	while (size > 0) {
-		phys_addr_t addr = virt_to_phys(dmab_data->area +
-				(ctx->cl_dev.frags * ctx->cl_dev.bufsize));
+	while (remaining > 0) {
+		phys_addr_t addr;
+		int chunk;
 
+		addr = snd_sgbuf_get_addr(dmab_data, offset);
 		bdl[0] = cpu_to_le32(lower_32_bits(addr));
 		bdl[1] = cpu_to_le32(upper_32_bits(addr));
+		chunk = snd_sgbuf_get_chunk_size(dmab_data, offset, size);
+		bdl[2] = cpu_to_le32(chunk);
 
-		bdl[2] = cpu_to_le32(ctx->cl_dev.bufsize);
-
-		size -= ctx->cl_dev.bufsize;
-		bdl[3] = (size || !with_ioc) ? 0 : cpu_to_le32(0x01);
+		remaining -= chunk;
+		bdl[3] = (remaining > 0) ? 0 : cpu_to_le32(0x01);
 
 		bdl += 4;
+		offset += chunk;
 		ctx->cl_dev.frags++;
 	}
 }
@@ -338,15 +343,15 @@ int skl_cldma_prepare(struct sst_dsp *ctx)
 	ctx->cl_dev.ops.cl_stop_dma = skl_cldma_stop;
 
 	/* Allocate buffer*/
-	ret = ctx->dsp_ops.alloc_dma_buf(ctx->dev,
-			&ctx->cl_dev.dmab_data, ctx->cl_dev.bufsize);
+	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, ctx->dev, ctx->cl_dev.bufsize,
+				  &ctx->cl_dev.dmab_data);
 	if (ret < 0) {
 		dev_err(ctx->dev, "Alloc buffer for base fw failed: %x\n", ret);
 		return ret;
 	}
+
 	/* Setup Code loader BDL */
-	ret = ctx->dsp_ops.alloc_dma_buf(ctx->dev,
-			&ctx->cl_dev.dmab_bdl, PAGE_SIZE);
+	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, ctx->dev, BDL_SIZE, &ctx->cl_dev.dmab_bdl);
 	if (ret < 0) {
 		dev_err(ctx->dev, "Alloc buffer for blde failed: %x\n", ret);
 		ctx->dsp_ops.free_dma_buf(ctx->dev, &ctx->cl_dev.dmab_data);