mm/gran: add gran_alloc_align API

for arm-v7a, possible region with 4K and need align with 16K.

Signed-off-by: buxiasen <buxiasen@xiaomi.com>

include/nuttx/mm/gran.h

@@ -200,6 +200,29 @@ FAR void *gran_reserve(GRAN_HANDLE handle, uintptr_t start, size_t size);
 
 FAR void *gran_alloc(GRAN_HANDLE handle, size_t size);
 
+/****************************************************************************
+ * Name: gran_alloc_align
+ *
+ * Description:
+ *   Allocate memory from the granule heap.
+ *
+ *   NOTE: The current implementation also restricts the maximum allocation
+ *   size to 32 granules.  That restriction could be eliminated with some
+ *   additional coding effort.
+ *
+ * Input Parameters:
+ *   handle - The handle previously returned by gran_initialize
+ *   size   - The size of the memory region to allocate.
+ *   align  - The size of the memory region to align.
+ *
+ * Returned Value:
+ *   On success, a non-NULL pointer to the allocated memory is returned;
+ *   NULL is returned on failure.
+ *
+ ****************************************************************************/
+
+FAR void *gran_alloc_align(GRAN_HANDLE handle, size_t size, size_t align);
+
 /****************************************************************************
  * Name: gran_free
  *

include/nuttx/pgalloc.h

@@ -166,6 +166,25 @@ void mm_pgreserve(uintptr_t start, size_t size);
 
 uintptr_t mm_pgalloc(unsigned int npages);
 
+/****************************************************************************
+ * Name: mm_pgalloc_align
+ *
+ * Description:
+ *   Allocate page memory from the page memory pool.
+ *
+ * Input Parameters:
+ *   npages - The number of pages to allocate, each of size CONFIG_MM_PGSIZE.
+ *   align  - The number of pages to align, each of size CONFIG_MM_PGSIZE.
+ *
+ * Returned Value:
+ *   On success, a non-zero, physical address of the allocated page memory
+ *   is returned.  Zero is returned on failure.  NOTE:  This is an unmapped
+ *   physical address and cannot be used until it is appropriately mapped.
+ *
+ ****************************************************************************/
+
+uintptr_t mm_pgalloc_align(unsigned int npages, unsigned int align);
+
 /****************************************************************************
  * Name: mm_pgfree
  *

mm/mm_gran/mm_granalloc.c

@@ -81,4 +81,51 @@ FAR void *gran_alloc(GRAN_HANDLE handle, size_t size)
   return (FAR void *)retp;
 }
 
+FAR void *gran_alloc_align(GRAN_HANDLE handle, size_t size, size_t align)
+{
+  FAR gran_t *gran = (FAR gran_t *)handle;
+  uintptr_t retp;
+  size_t nalign;
+  size_t ngran;
+  size_t naligned_up;
+  int posi;
+  int ret;
+
+  DEBUGASSERT(gran);
+  nalign = NGRANULE(gran, align);
+  ngran = NGRANULE(gran, size);
+
+  naligned_up = ngran + (nalign - 1);
+  if (!naligned_up || naligned_up > gran->ngranules)
+    {
+      return NULL;
+    }
+
+  ret = gran_enter_critical(gran);
+  if (ret < 0)
+    {
+      return NULL;
+    }
+
+  posi = gran_search(gran, naligned_up);
+  if (posi >= 0)
+    {
+      posi = (posi + nalign - 1) & ~(nalign - 1);
+      gran_set(gran, posi, ngran);
+    }
+
+  gran_leave_critical(gran);
+  if (posi < 0)
+    {
+      return NULL;
+    }
+
+  retp = gran->heapstart + (posi << gran->log2gran);
+  graninfo("heap=%"PRIxPTR" posi=%d retp=%"PRIxPTR" size=%zu n=%zu\n",
+           gran->heapstart, posi, retp, size, ngran);
+  DEBUGASSERT(retp >= gran->heapstart);
+  DEBUGASSERT(retp < gran->heapstart + GRANBYTE(gran));
+  return (FAR void *)retp;
+}
+
 #endif /* CONFIG_GRAN */

mm/mm_gran/mm_pgalloc.c

@@ -150,6 +150,30 @@ uintptr_t mm_pgalloc(unsigned int npages)
   return (uintptr_t)gran_alloc(g_pgalloc, (size_t)npages << MM_PGSHIFT);
 }
 
+/****************************************************************************
+ * Name: mm_pgalloc_align
+ *
+ * Description:
+ *   Allocate page memory from the page memory pool.
+ *
+ * Input Parameters:
+ *   npages - The number of pages to allocate, each of size CONFIG_MM_PGSIZE.
+ *   align  - The number of pages to align, each of size CONFIG_MM_PGSIZE.
+ *
+ * Returned Value:
+ *   On success, a non-zero, physical address of the allocated page memory
+ *   is returned.  Zero is returned on failure.  NOTE:  This is an unmapped
+ *   physical address and cannot be used until it is appropriately mapped.
+ *
+ ****************************************************************************/
+
+uintptr_t mm_pgalloc_align(unsigned int npages, unsigned int align)
+{
+  size_t alloc_size = (size_t)npages << MM_PGSHIFT;
+  size_t align_size = (size_t)align << MM_PGSHIFT;
+  return (uintptr_t)gran_alloc_align(g_pgalloc, alloc_size, align_size);
+}
+
 /****************************************************************************
  * Name: mm_pgfree
  *