change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/sound/xen/xen_snd_front_alsa.c
..
..
@@ -15,17 +15,24 @@
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 #include <sound/pcm_params.h>
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 #include <xen/xenbus.h>
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+#include <xen/xen-front-pgdir-shbuf.h>
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 #include "xen_snd_front.h"
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 #include "xen_snd_front_alsa.h"
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 #include "xen_snd_front_cfg.h"
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 #include "xen_snd_front_evtchnl.h"
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-#include "xen_snd_front_shbuf.h"
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 struct xen_snd_front_pcm_stream_info {
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 	struct xen_snd_front_info *front_info;
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 	struct xen_snd_front_evtchnl_pair *evt_pair;
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-	struct xen_snd_front_shbuf sh_buf;
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+
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+	/* This is the shared buffer with its backing storage. */
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+	struct xen_front_pgdir_shbuf shbuf;
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+	u8 *buffer;
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+	size_t buffer_sz;
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+	int num_pages;
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+	struct page **pages;
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+
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 	int index;
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 	bool is_open;
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@@ -189,7 +196,7 @@
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 	mask = 0;
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 	for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
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 		if (pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa) & alsa_formats)
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-			mask |= 1 << ALSA_SNDIF_FORMATS[i].sndif;
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+			mask |= BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif);
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 	return mask;
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 }
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@@ -201,7 +208,7 @@
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 	mask = 0;
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 	for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
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-		if (1 << ALSA_SNDIF_FORMATS[i].sndif & sndif_formats)
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+		if (BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif) & sndif_formats)
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 			mask |= pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa);
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 	return mask;
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@@ -214,12 +221,20 @@
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 	stream->out_frames = 0;
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 	atomic_set(&stream->hw_ptr, 0);
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 	xen_snd_front_evtchnl_pair_clear(stream->evt_pair);
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-	xen_snd_front_shbuf_clear(&stream->sh_buf);
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+	memset(&stream->shbuf, 0, sizeof(stream->shbuf));
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+	stream->buffer = NULL;
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+	stream->buffer_sz = 0;
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+	stream->pages = NULL;
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+	stream->num_pages = 0;
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 }
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 static void stream_free(struct xen_snd_front_pcm_stream_info *stream)
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 {
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-	xen_snd_front_shbuf_free(&stream->sh_buf);
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+	xen_front_pgdir_shbuf_unmap(&stream->shbuf);
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+	xen_front_pgdir_shbuf_free(&stream->shbuf);
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+	if (stream->buffer)
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+		free_pages_exact(stream->buffer, stream->buffer_sz);
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+	kfree(stream->pages);
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 	stream_clear(stream);
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 }
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@@ -421,10 +436,34 @@
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 	return 0;
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 }
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+static int shbuf_setup_backstore(struct xen_snd_front_pcm_stream_info *stream,
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+				 size_t buffer_sz)
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+{
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+	int i;
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+
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+	stream->buffer = alloc_pages_exact(buffer_sz, GFP_KERNEL);
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+	if (!stream->buffer)
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+		return -ENOMEM;
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+
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+	stream->buffer_sz = buffer_sz;
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+	stream->num_pages = DIV_ROUND_UP(stream->buffer_sz, PAGE_SIZE);
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+	stream->pages = kcalloc(stream->num_pages, sizeof(struct page *),
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+				GFP_KERNEL);
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+	if (!stream->pages)
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+		return -ENOMEM;
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+
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+	for (i = 0; i < stream->num_pages; i++)
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+		stream->pages[i] = virt_to_page(stream->buffer + i * PAGE_SIZE);
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+
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+	return 0;
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+}
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+
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 static int alsa_hw_params(struct snd_pcm_substream *substream,
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 			  struct snd_pcm_hw_params *params)
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 {
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 	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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+	struct xen_snd_front_info *front_info = stream->front_info;
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+	struct xen_front_pgdir_shbuf_cfg buf_cfg;
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 	int ret;
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 	/*
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@@ -432,19 +471,32 @@
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 	 * so free the previously allocated shared buffer if any.
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 	 */
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 	stream_free(stream);
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+	ret = shbuf_setup_backstore(stream, params_buffer_bytes(params));
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+	if (ret < 0)
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+		goto fail;
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477
 
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-	ret = xen_snd_front_shbuf_alloc(stream->front_info->xb_dev,
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-					&stream->sh_buf,
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-					params_buffer_bytes(params));
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-	if (ret < 0) {
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-		stream_free(stream);
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-		dev_err(&stream->front_info->xb_dev->dev,
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-			"Failed to allocate buffers for stream with index %d\n",
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-			stream->index);
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-		return ret;
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-	}
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+	memset(&buf_cfg, 0, sizeof(buf_cfg));
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+	buf_cfg.xb_dev = front_info->xb_dev;
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+	buf_cfg.pgdir = &stream->shbuf;
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+	buf_cfg.num_pages = stream->num_pages;
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+	buf_cfg.pages = stream->pages;
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+
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+	ret = xen_front_pgdir_shbuf_alloc(&buf_cfg);
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+	if (ret < 0)
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+		goto fail;
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+
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+	ret = xen_front_pgdir_shbuf_map(&stream->shbuf);
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+	if (ret < 0)
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+		goto fail;
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 	return 0;
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+
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+fail:
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+	stream_free(stream);
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+	dev_err(&front_info->xb_dev->dev,
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+		"Failed to allocate buffers for stream with index %d\n",
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+		stream->index);
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+	return ret;
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 }
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 static int alsa_hw_free(struct snd_pcm_substream *substream)
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@@ -476,7 +528,7 @@
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 		sndif_format = ret;
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 		ret = xen_snd_front_stream_prepare(&stream->evt_pair->req,
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-						   &stream->sh_buf,
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+						   &stream->shbuf,
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 						   sndif_format,
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 						   runtime->channels,
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 						   runtime->rate,
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@@ -556,10 +608,10 @@
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 {
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 	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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-	if (unlikely(pos + count > stream->sh_buf.buffer_sz))
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+	if (unlikely(pos + count > stream->buffer_sz))
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 		return -EINVAL;
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-	if (copy_from_user(stream->sh_buf.buffer + pos, src, count))
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+	if (copy_from_user(stream->buffer + pos, src, count))
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 		return -EFAULT;
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 	return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
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@@ -571,10 +623,10 @@
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 {
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 	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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-	if (unlikely(pos + count > stream->sh_buf.buffer_sz))
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+	if (unlikely(pos + count > stream->buffer_sz))
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 		return -EINVAL;
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-	memcpy(stream->sh_buf.buffer + pos, src, count);
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+	memcpy(stream->buffer + pos, src, count);
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 	return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
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 }
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@@ -586,14 +638,14 @@
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 	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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 	int ret;
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-	if (unlikely(pos + count > stream->sh_buf.buffer_sz))
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+	if (unlikely(pos + count > stream->buffer_sz))
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 		return -EINVAL;
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 	ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
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 	if (ret < 0)
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 		return ret;
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-	return copy_to_user(dst, stream->sh_buf.buffer + pos, count) ?
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+	return copy_to_user(dst, stream->buffer + pos, count) ?
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 		-EFAULT : 0;
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 }
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@@ -604,14 +656,14 @@
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 	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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 	int ret;
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-	if (unlikely(pos + count > stream->sh_buf.buffer_sz))
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+	if (unlikely(pos + count > stream->buffer_sz))
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 		return -EINVAL;
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 	ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
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 	if (ret < 0)
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 		return ret;
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-	memcpy(dst, stream->sh_buf.buffer + pos, count);
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+	memcpy(dst, stream->buffer + pos, count);
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 	return 0;
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 }
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@@ -622,10 +674,10 @@
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 {
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 	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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-	if (unlikely(pos + count > stream->sh_buf.buffer_sz))
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+	if (unlikely(pos + count > stream->buffer_sz))
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 		return -EINVAL;
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-	memset(stream->sh_buf.buffer + pos, 0, count);
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+	memset(stream->buffer + pos, 0, count);
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 	return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
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 }
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@@ -637,31 +689,29 @@
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  * to know when the buffer can be transferred to the backend.
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  */
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-static struct snd_pcm_ops snd_drv_alsa_playback_ops = {
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-	.open = alsa_open,
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-	.close = alsa_close,
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-	.ioctl = snd_pcm_lib_ioctl,
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-	.hw_params = alsa_hw_params,
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-	.hw_free = alsa_hw_free,
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-	.prepare = alsa_prepare,
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-	.trigger = alsa_trigger,
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-	.pointer = alsa_pointer,
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-	.copy_user = alsa_pb_copy_user,
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-	.copy_kernel = alsa_pb_copy_kernel,
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-	.fill_silence = alsa_pb_fill_silence,
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+static const struct snd_pcm_ops snd_drv_alsa_playback_ops = {
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+	.open		= alsa_open,
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+	.close		= alsa_close,
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+	.hw_params	= alsa_hw_params,
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+	.hw_free	= alsa_hw_free,
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+	.prepare	= alsa_prepare,
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+	.trigger	= alsa_trigger,
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+	.pointer	= alsa_pointer,
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+	.copy_user	= alsa_pb_copy_user,
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+	.copy_kernel	= alsa_pb_copy_kernel,
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+	.fill_silence	= alsa_pb_fill_silence,
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 };
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-static struct snd_pcm_ops snd_drv_alsa_capture_ops = {
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-	.open = alsa_open,
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-	.close = alsa_close,
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-	.ioctl = snd_pcm_lib_ioctl,
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-	.hw_params = alsa_hw_params,
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-	.hw_free = alsa_hw_free,
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-	.prepare = alsa_prepare,
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-	.trigger = alsa_trigger,
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-	.pointer = alsa_pointer,
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-	.copy_user = alsa_cap_copy_user,
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-	.copy_kernel = alsa_cap_copy_kernel,
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+static const struct snd_pcm_ops snd_drv_alsa_capture_ops = {
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+	.open		= alsa_open,
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+	.close		= alsa_close,
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+	.hw_params	= alsa_hw_params,
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+	.hw_free	= alsa_hw_free,
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+	.prepare	= alsa_prepare,
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+	.trigger	= alsa_trigger,
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+	.pointer	= alsa_pointer,
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+	.copy_user	= alsa_cap_copy_user,
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+	.copy_kernel	= alsa_cap_copy_kernel,
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 };
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 static int new_pcm_instance(struct xen_snd_front_card_info *card_info,