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buffer: extend ability to allocate on specific heap to all functions #10719

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e70041d
buffer: extend ability to allocate on specific heap to all functions
kv2019i Feb 16, 2026
ed502d7
alloc.h: remove rbrealloc() and rbrealloc_align()
kv2019i Feb 16, 2026
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23 changes: 0 additions & 23 deletions posix/include/rtos/alloc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -97,29 +97,6 @@ static inline void *rballoc(uint32_t flags, size_t bytes)
return rballoc_align(flags, bytes, PLATFORM_DCACHE_ALIGN);
}

/**
* Changes size of the memory block allocated.
* @param ptr Address of the block to resize.
* @param flags Flags, see SOF_MEM_FLAG_...
* @param bytes New size in bytes.
* @param old_bytes Old size in bytes.
* @param alignment Alignment in bytes.
* @return Pointer to the resized memory of NULL if failed.
*/
void *rbrealloc_align(void *ptr, uint32_t flags, size_t bytes,
size_t old_bytes, uint32_t alignment);

/**
* Similar to rballoc_align(), returns resized buffer aligned to
* PLATFORM_DCACHE_ALIGN.
*/
static inline void *rbrealloc(void *ptr, uint32_t flags,
size_t bytes, size_t old_bytes)
{
return rbrealloc_align(ptr, flags, bytes, old_bytes,
PLATFORM_DCACHE_ALIGN);
}

/**
* Frees the memory block.
* @param ptr Pointer to the memory block.
Expand Down
63 changes: 26 additions & 37 deletions src/audio/buffers/comp_buffer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -161,7 +161,7 @@ static void comp_buffer_free(struct sof_audio_buffer *audio_buffer)

struct k_heap *heap = buffer->audio_buffer.heap;

rfree(buffer->stream.addr);
sof_heap_free(heap, buffer->stream.addr);
sof_heap_free(heap, buffer);
if (heap) {
struct dp_heap_user *mod_heap_user = container_of(heap, struct dp_heap_user, heap);
Expand Down Expand Up @@ -254,7 +254,7 @@ struct comp_buffer *buffer_alloc(struct k_heap *heap, size_t size, uint32_t flag
return NULL;
}

stream_addr = rballoc_align(flags, size, align);
stream_addr = sof_heap_alloc(heap, flags, size, align);
if (!stream_addr) {
tr_err(&buffer_tr, "could not alloc size = %zu bytes of flags = 0x%x",
size, flags);
Expand All @@ -264,7 +264,7 @@ struct comp_buffer *buffer_alloc(struct k_heap *heap, size_t size, uint32_t flag
buffer = buffer_alloc_struct(heap, stream_addr, size, flags, is_shared);
if (!buffer) {
tr_err(&buffer_tr, "could not alloc buffer structure");
rfree(stream_addr);
sof_heap_free(heap, stream_addr);
}

return buffer;
Expand Down Expand Up @@ -292,7 +292,7 @@ struct comp_buffer *buffer_alloc_range(struct k_heap *heap, size_t preferred_siz
preferred_size += minimum_size - preferred_size % minimum_size;

for (size = preferred_size; size >= minimum_size; size -= minimum_size) {
stream_addr = rballoc_align(flags, size, align);
stream_addr = sof_heap_alloc(heap, flags, size, align);
if (stream_addr)
break;
}
Expand All @@ -308,7 +308,7 @@ struct comp_buffer *buffer_alloc_range(struct k_heap *heap, size_t preferred_siz
buffer = buffer_alloc_struct(heap, stream_addr, size, flags, is_shared);
if (!buffer) {
tr_err(&buffer_tr, "could not alloc buffer structure");
rfree(stream_addr);
sof_heap_free(heap, stream_addr);
}

return buffer;
Expand Down Expand Up @@ -341,14 +341,8 @@ int buffer_set_size(struct comp_buffer *buffer, uint32_t size, uint32_t alignmen
if (size == audio_stream_get_size(&buffer->stream))
return 0;

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In buffer_set_size(), when callers pass alignment==0 (e.g. module_adapter.c and copier_ipcgtw.c do), this now forwards 0 to sof_heap_alloc(). Previously the alignment==0 path used rbrealloc() which implicitly aligned to PLATFORM_DCACHE_ALIGN. To preserve behavior and avoid potentially invalid/insufficient alignment from the underlying heap, map alignment==0 to PLATFORM_DCACHE_ALIGN (or to audio_stream_get_align()/existing stream alignment) before calling sof_heap_alloc().

Suggested change
if (!alignment)
alignment = PLATFORM_DCACHE_ALIGN;

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@kv2019i kv2019i Apr 23, 2026

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The same semantics are now implemented by sof_heap_alloc() so 0 can be passed forward to it.

if (!alignment)
new_ptr = rbrealloc(audio_stream_get_addr(&buffer->stream),
buffer->flags | SOF_MEM_FLAG_NO_COPY,
size, audio_stream_get_size(&buffer->stream));
else
new_ptr = rbrealloc_align(audio_stream_get_addr(&buffer->stream),
buffer->flags | SOF_MEM_FLAG_NO_COPY, size,
audio_stream_get_size(&buffer->stream), alignment);
new_ptr = sof_heap_alloc(buffer->audio_buffer.heap, buffer->flags, size, alignment);

/* we couldn't allocate bigger chunk */
if (!new_ptr && size > audio_stream_get_size(&buffer->stream)) {
buf_err(buffer, "resize can't alloc %u bytes of flags 0x%x",
Expand All @@ -357,8 +351,10 @@ int buffer_set_size(struct comp_buffer *buffer, uint32_t size, uint32_t alignmen
}

/* use bigger chunk, else just use the old chunk but set smaller */
if (new_ptr)
if (new_ptr) {
sof_heap_free(buffer->audio_buffer.heap, audio_stream_get_addr(&buffer->stream));
buffer->stream.addr = new_ptr;
}

buffer_init_stream(buffer, size);

Expand All @@ -368,7 +364,6 @@ int buffer_set_size(struct comp_buffer *buffer, uint32_t size, uint32_t alignmen
int buffer_set_size_range(struct comp_buffer *buffer, size_t preferred_size, size_t minimum_size,
uint32_t alignment)
{
void *ptr = audio_stream_get_addr(&buffer->stream);
const size_t actual_size = audio_stream_get_size(&buffer->stream);
void *new_ptr = NULL;
size_t new_size;
Expand All @@ -389,34 +384,28 @@ int buffer_set_size_range(struct comp_buffer *buffer, size_t preferred_size, siz
if (preferred_size == actual_size)
return 0;

if (!alignment) {
for (new_size = preferred_size; new_size >= minimum_size;
new_size -= minimum_size) {
new_ptr = rbrealloc(ptr, buffer->flags | SOF_MEM_FLAG_NO_COPY,
new_size, actual_size);
if (new_ptr)
break;
}
} else {
for (new_size = preferred_size; new_size >= minimum_size;
new_size -= minimum_size) {
new_ptr = rbrealloc_align(ptr, buffer->flags | SOF_MEM_FLAG_NO_COPY,
new_size, actual_size, alignment);
if (new_ptr)
break;
}
for (new_size = preferred_size; new_size >= minimum_size;
new_size -= minimum_size) {
new_ptr = sof_heap_alloc(buffer->audio_buffer.heap, buffer->flags, new_size, alignment);
if (new_ptr)
Comment on lines +389 to +390
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In buffer_set_size_range(), alignment is forwarded directly to sof_heap_alloc(). When alignment==0, earlier code used rbrealloc() (i.e., PLATFORM_DCACHE_ALIGN via the rbrealloc wrapper). To avoid potentially allocating buffers with weaker-than-expected alignment, consider normalizing alignment==0 to PLATFORM_DCACHE_ALIGN (or the stream’s current alignment) before the allocation loop.

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@kv2019i kv2019i Apr 23, 2026

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sof_heap_alloc() implements these semantics for alignment==0, so no need to add a special case for PLATFORM_DCACHE_ALIGN here.

break;
}
Comment on lines +387 to 392
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buffer_set_size_range(): the resize loop decrements new_size until it drops below minimum_size. If all allocations fail, new_ptr stays NULL and new_size will end up < minimum_size (often 0), but the function later calls buffer_init_stream(buffer, new_size). That can set an invalid size despite the earlier validation. Consider handling the “no allocation succeeded” case explicitly: for grow requests return -ENOMEM without changing the stream; for shrink requests skip allocating a new block and just set the stream size to the chosen target (>= minimum_size).

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@kv2019i kv2019i Apr 23, 2026

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Fixed in V2.


/* we couldn't allocate bigger chunk */
if (!new_ptr && new_size > actual_size) {
buf_err(buffer, "resize can't alloc %zu bytes of flags 0x%x", new_size,
buffer->flags);
return -ENOMEM;
/* If no allocation succeeded, check if old buffer is large enough */
if (!new_ptr) {
if (minimum_size > actual_size) {
buf_err(buffer, "resize can't alloc %zu bytes of flags 0x%x",
minimum_size, buffer->flags);
return -ENOMEM;
}
new_size = minimum_size;
}

/* use bigger chunk, else just use the old chunk but set smaller */
if (new_ptr)
if (new_ptr) {
sof_heap_free(buffer->audio_buffer.heap, audio_stream_get_addr(&buffer->stream));
buffer->stream.addr = new_ptr;
}

buffer_init_stream(buffer, new_size);

Expand Down
12 changes: 0 additions & 12 deletions src/lib/alloc.c
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Expand Up @@ -38,18 +38,6 @@ void rfree(void *ptr)
free(ptr);
}

void *rbrealloc_align(void *ptr, uint32_t flags, size_t bytes,
size_t old_bytes, uint32_t alignment)
{
void *newptr = aligned_alloc(alignment, bytes);

if (!newptr)
return NULL;
memcpy(newptr, ptr, bytes > old_bytes ? old_bytes : bytes);
free(ptr);
return newptr;
}

/* TODO: all mm_pm_...() routines to be implemented for IMR storage */
uint32_t mm_pm_context_size(void)
{
Expand Down
6 changes: 0 additions & 6 deletions src/platform/library/lib/alloc.c
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Expand Up @@ -42,12 +42,6 @@ void *rballoc_align(uint32_t flags, size_t bytes,
return malloc(bytes);
}

void *rbrealloc_align(void *ptr, uint32_t flags, size_t bytes,
size_t old_bytes, uint32_t alignment)
{
return realloc(ptr, bytes);
}

void *sof_heap_alloc(struct k_heap *heap, uint32_t flags, size_t bytes,
size_t alignment)
{
Expand Down
10 changes: 0 additions & 10 deletions test/cmocka/src/common_mocks.c
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Expand Up @@ -59,16 +59,6 @@ void WEAK *rzalloc(uint32_t flags,
return calloc(bytes, 1);
}

void WEAK *rbrealloc_align(void *ptr, uint32_t flags,
size_t bytes, size_t old_bytes, uint32_t alignment)
{
(void)flags;
(void)old_bytes;
(void)alignment;

return realloc(ptr, bytes);
}

void WEAK *rmalloc_align(uint32_t flags, size_t bytes, uint32_t alignment)
{
(void)flags;
Expand Down
23 changes: 0 additions & 23 deletions zephyr/include/rtos/alloc.h
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Expand Up @@ -88,29 +88,6 @@ static inline void *rballoc(uint32_t flags, size_t bytes)
return rballoc_align(flags, bytes, PLATFORM_DCACHE_ALIGN);
}

/**
* Changes size of the memory block allocated.
* @param ptr Address of the block to resize.
* @param flags Flags, see SOF_MEM_FLAG_...
* @param bytes New size in bytes.
* @param old_bytes Old size in bytes.
* @param alignment Alignment in bytes.
* @return Pointer to the resized memory of NULL if failed.
*/
void *rbrealloc_align(void *ptr, uint32_t flags, size_t bytes,
size_t old_bytes, uint32_t alignment);

/**
* Similar to rballoc_align(), returns resized buffer aligned to
* PLATFORM_DCACHE_ALIGN.
*/
static inline void *rbrealloc(void *ptr, uint32_t flags,
size_t bytes, size_t old_bytes)
{
return rbrealloc_align(ptr, flags, bytes, old_bytes,
PLATFORM_DCACHE_ALIGN);
}

/**
* Frees the memory block.
* @param ptr Pointer to the memory block.
Expand Down
30 changes: 0 additions & 30 deletions zephyr/lib/alloc.c
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Expand Up @@ -493,36 +493,6 @@ void *rmalloc(uint32_t flags, size_t bytes)
}
EXPORT_SYMBOL(rmalloc);

void *rbrealloc_align(void *ptr, uint32_t flags, size_t bytes,
size_t old_bytes, uint32_t alignment)
{
void *new_ptr;

if (!ptr) {
return rballoc_align(flags, bytes, alignment);
}

/* Original version returns NULL without freeing this memory */
if (!bytes) {
/* TODO: Should we call rfree(ptr); */
tr_err(&zephyr_tr, "realloc failed for 0 bytes");
return NULL;
}

new_ptr = rballoc_align(flags, bytes, alignment);
if (!new_ptr)
return NULL;

if (!(flags & SOF_MEM_FLAG_NO_COPY))
memcpy_s(new_ptr, bytes, ptr, MIN(bytes, old_bytes));

rfree(ptr);

tr_info(&zephyr_tr, "rbealloc: new ptr %p", new_ptr);

return new_ptr;
}

/**
* Similar to rmalloc(), guarantees that returned block is zeroed.
*/
Expand Down
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