Add aligned malloc function [new kernel required]

vmeta wants to allocate memory with specific alignments.  Rather than
having vmeta request more memory of bmm, and then doing alignment on
the result, provide a proper API to do this task.  This requires an
updated kernel.

1 files changed, 11 insertions, 3 deletions

diff --git a/bmm_lib.c b/bmm_lib.c
index ab33cde..4def40b 100644
--- a/bmm_lib.c
+++ b/bmm_lib.c
@@ -51,7 +51,7 @@ void bmm_exit()
 	bmm_fd = -1;
 }
 
-void *bmm_malloc(unsigned long size, int attr)
+void *bmm_malloc_aligned(unsigned long size, int attr, unsigned align)
 {
 	int ret;
 	void *vaddr;
@@ -63,6 +63,8 @@ void *bmm_malloc(unsigned long size, int attr)
 	if(bmm_init() < 0)
 		return NULL;
 
+	pr_debug("%s(size=%lu,attr=%x,align=%u)\n", __FUNCTION__, size, attr, align);
+
 	/* obsolete, only for back-compatible */
 	if ((attr & BMM_ATTR_NONBUFFERABLE)&&(attr & BMM_ATTR_NONCACHEABLE))
 		attr = BMM_ATTR_NONCACHED;
@@ -70,10 +72,11 @@ void *bmm_malloc(unsigned long size, int attr)
 	if ((!(attr & BMM_ATTR_NONBUFFERABLE))&&(attr & BMM_ATTR_NONCACHEABLE))
 		attr = BMM_ATTR_WRITECOMBINE;
 
-	io.input = size;
+	io.input = align;
+	io.length = size;
 	io.output = 0;
 	io.arg = attr;
-	ret = ioctl(bmm_fd, BMM_MALLOC, &io);
+	ret = ioctl(bmm_fd, BMM_MALLOC_ALIGNED, &io);
 	if(ret < 0 || io.output == 0)
 		return NULL;
 
@@ -83,6 +86,11 @@ void *bmm_malloc(unsigned long size, int attr)
 	return ((int)vaddr == -1) ? NULL : vaddr;
 }
 
+void *bmm_malloc(unsigned long size, int attr)
+{
+	return bmm_malloc_aligned(size, attr, sizeof(int));
+}
+
 void bmm_free(void *vaddr)
 {
 	unsigned long size;