[PATCH] spufs: Improved SPU preemptability.
This patch makes it easier to preempt an SPU context by
having the scheduler hold ctx->state_sema for much shorter
periods of time.
As part of this restructuring, the control logic for the "run"
operation is moved from arch/ppc64/kernel/spu_base.c to
fs/spufs/file.c. Of course the base retains "bottom half"
handlers for class{0,1} irqs. The new run loop will re-acquire
an SPU if preempted.
From: Mark Nutter <mnutter@us.ibm.com>
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 93c6a05..20f4e51 100644
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -51,6 +51,7 @@
struct kref kref;
wait_queue_head_t ibox_wq;
wait_queue_head_t wbox_wq;
+ wait_queue_head_t stop_wq;
struct fasync_struct *ibox_fasync;
struct fasync_struct *wbox_fasync;
struct spu_context_ops *ops;
@@ -74,6 +75,8 @@
void (*npc_write) (struct spu_context * ctx, u32 data);
u32(*status_read) (struct spu_context * ctx);
char*(*get_ls) (struct spu_context * ctx);
+ void (*runcntl_write) (struct spu_context * ctx, u32 data);
+ void (*runcntl_stop) (struct spu_context * ctx);
};
extern struct spu_context_ops spu_hw_ops;
@@ -99,6 +102,7 @@
void destroy_spu_context(struct kref *kref);
struct spu_context * get_spu_context(struct spu_context *ctx);
int put_spu_context(struct spu_context *ctx);
+void spu_unmap_mappings(struct spu_context *ctx);
void spu_forget(struct spu_context *ctx);
void spu_acquire(struct spu_context *ctx);
@@ -118,5 +122,6 @@
/* irq callback funcs. */
void spufs_ibox_callback(struct spu *spu);
void spufs_wbox_callback(struct spu *spu);
+void spufs_stop_callback(struct spu *spu);
#endif