1 files changed, 171 insertions, 75 deletions

diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index b3f5344f60b..54debc07f5c 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -1,6 +1,6 @@
 /*
  *  Digital Audio (PCM) abstract layer
- *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  *
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -19,11 +19,13 @@
  *
  */
 
-#include <sound/driver.h>
 #include <asm/io.h>
 #include <linux/time.h>
 #include <linux/init.h>
+#include <linux/slab.h>
 #include <linux/moduleparam.h>
+#include <linux/vmalloc.h>
+#include <linux/export.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/info.h>
@@ -46,22 +48,12 @@ static const size_t snd_minimum_buffer = 16384;
  *
  * the minimum size is snd_minimum_buffer.  it should be power of 2.
  */
-static int preallocate_pcm_pages(snd_pcm_substream_t *substream, size_t size)
+static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size)
 {
 	struct snd_dma_buffer *dmab = &substream->dma_buffer;
+	size_t orig_size = size;
 	int err;
 
-	snd_assert(size > 0, return -EINVAL);
-
-	/* already reserved? */
-	if (snd_dma_get_reserved_buf(dmab, substream->dma_buf_id) > 0) {
-		if (dmab->bytes >= size)
-			return 0; /* yes */
-		/* no, free the reserved block */
-		snd_dma_free_pages(dmab);
-		dmab->bytes = 0;
-	}
-
 	do {
 		if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev,
 					       size, dmab)) < 0) {
@@ -72,20 +64,21 @@ static int preallocate_pcm_pages(snd_pcm_substream_t *substream, size_t size)
 		size >>= 1;
 	} while (size >= snd_minimum_buffer);
 	dmab->bytes = 0; /* tell error */
+	pr_warn("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n",
+		substream->pcm->card->number, substream->pcm->device,
+		substream->stream ? 'c' : 'p', substream->number,
+		substream->pcm->name, orig_size);
 	return 0;
 }
 
 /*
  * release the preallocated buffer if not yet done.
  */
-static void snd_pcm_lib_preallocate_dma_free(snd_pcm_substream_t *substream)
+static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream)
 {
 	if (substream->dma_buffer.area == NULL)
 		return;
-	if (substream->dma_buf_id)
-		snd_dma_reserve_buf(&substream->dma_buffer, substream->dma_buf_id);
-	else
-		snd_dma_free_pages(&substream->dma_buffer);
+	snd_dma_free_pages(&substream->dma_buffer);
 	substream->dma_buffer.area = NULL;
 }
 
@@ -95,15 +88,17 @@ static void snd_pcm_lib_preallocate_dma_free(snd_pcm_substream_t *substream)
  *
  * Releases the pre-allocated buffer of the given substream.
  *
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
  */
-int snd_pcm_lib_preallocate_free(snd_pcm_substream_t *substream)
+int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
 {
 	snd_pcm_lib_preallocate_dma_free(substream);
-	if (substream->proc_prealloc_entry) {
-		snd_info_unregister(substream->proc_prealloc_entry);
-		substream->proc_prealloc_entry = NULL;
-	}
+#ifdef CONFIG_SND_VERBOSE_PROCFS
+	snd_info_free_entry(substream->proc_prealloc_max_entry);
+	substream->proc_prealloc_max_entry = NULL;
+	snd_info_free_entry(substream->proc_prealloc_entry);
+	substream->proc_prealloc_entry = NULL;
+#endif
 	return 0;
 }
 
@@ -113,11 +108,11 @@ int snd_pcm_lib_preallocate_free(snd_pcm_substream_t *substream)
  *
  * Releases all the pre-allocated buffers on the given pcm.
  *
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
  */
-int snd_pcm_lib_preallocate_free_for_all(snd_pcm_t *pcm)
+int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)
 {
-	snd_pcm_substream_t *substream;
+	struct snd_pcm_substream *substream;
 	int stream;
 
 	for (stream = 0; stream < 2; stream++)
@@ -126,27 +121,42 @@ int snd_pcm_lib_preallocate_free_for_all(snd_pcm_t *pcm)
 	return 0;
 }
 
+EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
+
+#ifdef CONFIG_SND_VERBOSE_PROCFS
 /*
  * read callback for prealloc proc file
  *
  * prints the current allocated size in kB.
  */
-static void snd_pcm_lib_preallocate_proc_read(snd_info_entry_t *entry,
-					      snd_info_buffer_t *buffer)
+static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry,
+					      struct snd_info_buffer *buffer)
 {
-	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
+	struct snd_pcm_substream *substream = entry->private_data;
 	snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024);
 }
 
 /*
+ * read callback for prealloc_max proc file
+ *
+ * prints the maximum allowed size in kB.
+ */
+static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry,
+						  struct snd_info_buffer *buffer)
+{
+	struct snd_pcm_substream *substream = entry->private_data;
+	snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024);
+}
+
+/*
  * write callback for prealloc proc file
  *
  * accepts the preallocation size in kB.
  */
-static void snd_pcm_lib_preallocate_proc_write(snd_info_entry_t *entry,
-					       snd_info_buffer_t *buffer)
+static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
+					       struct snd_info_buffer *buffer)
 {
-	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
+	struct snd_pcm_substream *substream = entry->private_data;
 	char line[64], str[64];
 	size_t size;
 	struct snd_dma_buffer new_dmab;
@@ -185,24 +195,12 @@ static void snd_pcm_lib_preallocate_proc_write(snd_info_entry_t *entry,
 	}
 }
 
-/*
- * pre-allocate the buffer and create a proc file for the substream
- */
-static int snd_pcm_lib_preallocate_pages1(snd_pcm_substream_t *substream,
-					  size_t size, size_t max)
+static inline void preallocate_info_init(struct snd_pcm_substream *substream)
 {
-	snd_info_entry_t *entry;
-
-	if (size > 0 && preallocate_dma && substream->number < maximum_substreams)
-		preallocate_pcm_pages(substream, size);
+	struct snd_info_entry *entry;
 
-	if (substream->dma_buffer.bytes > 0)
-		substream->buffer_bytes_max = substream->dma_buffer.bytes;
-	substream->dma_max = max;
 	if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
-		entry->c.text.read_size = 64;
 		entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
-		entry->c.text.write_size = 64;
 		entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
 		entry->mode |= S_IWUSR;
 		entry->private_data = substream;
@@ -212,6 +210,35 @@ static int snd_pcm_lib_preallocate_pages1(snd_pcm_substream_t *substream,
 		}
 	}
 	substream->proc_prealloc_entry = entry;
+	if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) {
+		entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read;
+		entry->private_data = substream;
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	substream->proc_prealloc_max_entry = entry;
+}
+
+#else /* !CONFIG_SND_VERBOSE_PROCFS */
+#define preallocate_info_init(s)
+#endif /* CONFIG_SND_VERBOSE_PROCFS */
+
+/*
+ * pre-allocate the buffer and create a proc file for the substream
+ */
+static int snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream,
+					  size_t size, size_t max)
+{
+
+	if (size > 0 && preallocate_dma && substream->number < maximum_substreams)
+		preallocate_pcm_pages(substream, size);
+
+	if (substream->dma_buffer.bytes > 0)
+		substream->buffer_bytes_max = substream->dma_buffer.bytes;
+	substream->dma_max = max;
+	preallocate_info_init(substream);
 	return 0;
 }
 
@@ -220,20 +247,15 @@ static int snd_pcm_lib_preallocate_pages1(snd_pcm_substream_t *substream,
  * snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type
  * @substream: the pcm substream instance
  * @type: DMA type (SNDRV_DMA_TYPE_*)
- * @data: DMA type dependant data
+ * @data: DMA type dependent data
  * @size: the requested pre-allocation size in bytes
  * @max: the max. allowed pre-allocation size
  *
  * Do pre-allocation for the given DMA buffer type.
  *
- * When substream->dma_buf_id is set, the function tries to look for
- * the reserved buffer, and the buffer is not freed but reserved at
- * destruction time.  The dma_buf_id must be unique for all systems
- * (in the same DMA buffer type) e.g. using snd_dma_pci_buf_id().
- *
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
  */
-int snd_pcm_lib_preallocate_pages(snd_pcm_substream_t *substream,
+int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 				  int type, struct device *data,
 				  size_t size, size_t max)
 {
@@ -242,24 +264,26 @@ int snd_pcm_lib_preallocate_pages(snd_pcm_substream_t *substream,
 	return snd_pcm_lib_preallocate_pages1(substream, size, max);
 }
 
+EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
+
 /**
- * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continous memory type (all substreams)
+ * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continuous memory type (all substreams)
  * @pcm: the pcm instance
  * @type: DMA type (SNDRV_DMA_TYPE_*)
- * @data: DMA type dependant data
+ * @data: DMA type dependent data
  * @size: the requested pre-allocation size in bytes
  * @max: the max. allowed pre-allocation size
  *
  * Do pre-allocation to all substreams of the given pcm for the
  * specified DMA type.
  *
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
  */
-int snd_pcm_lib_preallocate_pages_for_all(snd_pcm_t *pcm,
+int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 					  int type, void *data,
 					  size_t size, size_t max)
 {
-	snd_pcm_substream_t *substream;
+	struct snd_pcm_substream *substream;
 	int stream, err;
 
 	for (stream = 0; stream < 2; stream++)
@@ -269,15 +293,19 @@ int snd_pcm_lib_preallocate_pages_for_all(snd_pcm_t *pcm,
 	return 0;
 }
 
+EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
+
+#ifdef CONFIG_SND_DMA_SGBUF
 /**
  * snd_pcm_sgbuf_ops_page - get the page struct at the given offset
  * @substream: the pcm substream instance
  * @offset: the buffer offset
  *
- * Returns the page struct at the given buffer offset.
  * Used as the page callback of PCM ops.
+ *
+ * Return: The page struct at the given buffer offset. %NULL on failure.
  */
-struct page *snd_pcm_sgbuf_ops_page(snd_pcm_substream_t *substream, unsigned long offset)
+struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset)
 {
 	struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
 
@@ -287,6 +315,9 @@ struct page *snd_pcm_sgbuf_ops_page(snd_pcm_substream_t *substream, unsigned lon
 	return sgbuf->page_table[idx];
 }
 
+EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
+#endif /* CONFIG_SND_DMA_SGBUF */
+
 /**
  * snd_pcm_lib_malloc_pages - allocate the DMA buffer
  * @substream: the substream to allocate the DMA buffer to
@@ -295,18 +326,20 @@ struct page *snd_pcm_sgbuf_ops_page(snd_pcm_substream_t *substream, unsigned lon
  * Allocates the DMA buffer on the BUS type given earlier to
  * snd_pcm_lib_preallocate_xxx_pages().
  *
- * Returns 1 if the buffer is changed, 0 if not changed, or a negative
+ * Return: 1 if the buffer is changed, 0 if not changed, or a negative
  * code on failure.
  */
-int snd_pcm_lib_malloc_pages(snd_pcm_substream_t *substream, size_t size)
+int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
 {
-	snd_pcm_runtime_t *runtime;
+	struct snd_pcm_runtime *runtime;
 	struct snd_dma_buffer *dmab = NULL;
 
-	snd_assert(substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_UNKNOWN, return -EINVAL);
-	snd_assert(substream != NULL, return -EINVAL);
+	if (PCM_RUNTIME_CHECK(substream))
+		return -EINVAL;
+	if (snd_BUG_ON(substream->dma_buffer.dev.type ==
+		       SNDRV_DMA_TYPE_UNKNOWN))
+		return -EINVAL;
 	runtime = substream->runtime;
-	snd_assert(runtime != NULL, return -EINVAL);
 
 	if (runtime->dma_buffer_p) {
 		/* perphaps, we might free the large DMA memory region
@@ -318,7 +351,8 @@ int snd_pcm_lib_malloc_pages(snd_pcm_substream_t *substream, size_t size)
 		}
 		snd_pcm_lib_free_pages(substream);
 	}
-	if (substream->dma_buffer.area != NULL && substream->dma_buffer.bytes >= size) {
+	if (substream->dma_buffer.area != NULL &&
+	    substream->dma_buffer.bytes >= size) {
 		dmab = &substream->dma_buffer; /* use the pre-allocated buffer */
 	} else {
 		dmab = kzalloc(sizeof(*dmab), GFP_KERNEL);
@@ -337,21 +371,23 @@ int snd_pcm_lib_malloc_pages(snd_pcm_substream_t *substream, size_t size)
 	return 1;			/* area was changed */
 }
 
+EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
+
 /**
  * snd_pcm_lib_free_pages - release the allocated DMA buffer.
  * @substream: the substream to release the DMA buffer
  *
  * Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages().
  *
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
  */
-int snd_pcm_lib_free_pages(snd_pcm_substream_t *substream)
+int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
 {
-	snd_pcm_runtime_t *runtime;
+	struct snd_pcm_runtime *runtime;
 
-	snd_assert(substream != NULL, return -EINVAL);
+	if (PCM_RUNTIME_CHECK(substream))
+		return -EINVAL;
 	runtime = substream->runtime;
-	snd_assert(runtime != NULL, return -EINVAL);
 	if (runtime->dma_area == NULL)
 		return 0;
 	if (runtime->dma_buffer_p != &substream->dma_buffer) {
@@ -362,3 +398,63 @@ int snd_pcm_lib_free_pages(snd_pcm_substream_t *substream)
 	snd_pcm_set_runtime_buffer(substream, NULL);
 	return 0;
 }
+
+EXPORT_SYMBOL(snd_pcm_lib_free_pages);
+
+int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
+				      size_t size, gfp_t gfp_flags)
+{
+	struct snd_pcm_runtime *runtime;
+
+	if (PCM_RUNTIME_CHECK(substream))
+		return -EINVAL;
+	runtime = substream->runtime;
+	if (runtime->dma_area) {
+		if (runtime->dma_bytes >= size)
+			return 0; /* already large enough */
+		vfree(runtime->dma_area);
+	}
+	runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL);
+	if (!runtime->dma_area)
+		return -ENOMEM;
+	runtime->dma_bytes = size;
+	return 1;
+}
+EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer);
+
+/**
+ * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer
+ * @substream: the substream with a buffer allocated by
+ *	snd_pcm_lib_alloc_vmalloc_buffer()
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ */
+int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime;
+
+	if (PCM_RUNTIME_CHECK(substream))
+		return -EINVAL;
+	runtime = substream->runtime;
+	vfree(runtime->dma_area);
+	runtime->dma_area = NULL;
+	return 0;
+}
+EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer);
+
+/**
+ * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct
+ * @substream: the substream with a buffer allocated by
+ *	snd_pcm_lib_alloc_vmalloc_buffer()
+ * @offset: offset in the buffer
+ *
+ * This function is to be used as the page callback in the PCM ops.
+ *
+ * Return: The page struct, or %NULL on failure.
+ */
+struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
+					  unsigned long offset)
+{
+	return vmalloc_to_page(substream->runtime->dma_area + offset);
+}
+EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page);