MIPS: DMA: Add cma support
Adds cma support to the MIPS architecture.
cma uses memblock. However, mips uses bootmem.
bootmem is informed about any regions reserved by memblock
dma api is modified to use cma reserved memory regions when available
Tested using cma_test. cma_test is a simple driver that assigns blocks
of memory from cma reserved sections.
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: catalin.marinas@arm.com
Cc: will.deacon@arm.com
Cc: tglx@linutronix.de
Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: arnd@arndb.de
Cc: gregkh@linuxfoundation.org
Cc: m.szyprowski@samsung.com
Cc: x86@kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-arch@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7360/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 7c1fe2b..b3b8f0d 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -24,6 +24,8 @@
#include <linux/debugfs.h>
#include <linux/kexec.h>
#include <linux/sizes.h>
+#include <linux/device.h>
+#include <linux/dma-contiguous.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
@@ -476,6 +478,7 @@
* o bootmem_init()
* o sparse_init()
* o paging_init()
+ * o dma_continguous_reserve()
*
* At this stage the bootmem allocator is ready to use.
*
@@ -609,6 +612,7 @@
static void __init arch_mem_init(char **cmdline_p)
{
+ struct memblock_region *reg;
extern void plat_mem_setup(void);
/* call board setup routine */
@@ -675,6 +679,11 @@
sparse_init();
plat_swiotlb_setup();
paging_init();
+
+ dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
+ /* Tell bootmem about cma reserved memblock section */
+ for_each_memblock(reserved, reg)
+ reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
}
static void __init resource_init(void)