[PATCH] spufs: switchable spu contexts
Add some infrastructure for saving and restoring the context of an
SPE. This patch creates a new structure that can hold the whole
state of a physical SPE in memory. It also contains code that
avoids races during the context switch and the binary code that
is loaded to the SPU in order to access its registers.
The actual PPE- and SPE-side context switch code are two separate
patches.
Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h
index b37fe79..67aff57 100644
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -28,6 +28,7 @@
#include <linux/fs.h>
#include <asm/spu.h>
+#include <asm/spu_csa.h>
/* The magic number for our file system */
enum {
@@ -36,6 +37,7 @@
struct spu_context {
struct spu *spu; /* pointer to a physical SPU */
+ struct spu_state csa; /* SPU context save area. */
struct rw_semaphore backing_sema; /* protects the above */
spinlock_t mmio_lock; /* protects mmio access */