[POWERPC] spusched: Switch from workqueues to kthread + timer tick

Get rid of the scheduler workqueues that complicated things a lot to
a dedicated spu scheduler thread that gets woken by a traditional
scheduler tick.  By default this scheduler tick runs a HZ * 10, aka
one spu scheduler tick for every 10 cpu ticks.

Currently the tick is not disabled when we have less context than
available spus, but I will implement this later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 1 insertions, 5 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/run.c b/arch/powerpc/platforms/cell/spufs/run.c
index 3ba30cea764a..89b02b6bfc55 100644
--- a/arch/powerpc/platforms/cell/spufs/run.c
+++ b/arch/powerpc/platforms/cell/spufs/run.c
@@ -144,7 +144,6 @@ static int spu_run_init(struct spu_context *ctx, u32 * npc)
                 ctx->ops->runcntl_write(ctx, runcntl);
         } else {
                 unsigned long mode = SPU_PRIVCNTL_MODE_NORMAL;
-                spu_start_tick(ctx);
                 ctx->ops->npc_write(ctx, *npc);
                 if (test_thread_flag(TIF_SINGLESTEP))
                         mode = SPU_PRIVCNTL_MODE_SINGLE_STEP;
@@ -160,7 +159,6 @@ static int spu_run_fini(struct spu_context *ctx, u32 * npc,
 {
         int ret = 0;
 
-        spu_stop_tick(ctx);
         *status = ctx->ops->status_read(ctx);
         *npc = ctx->ops->npc_read(ctx);
         spu_release(ctx);
@@ -330,10 +328,8 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx,
 
                 if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) {
                         ret = spu_reacquire_runnable(ctx, npc, &status);
-                        if (ret) {
-                                spu_stop_tick(ctx);
+                        if (ret)
                                 goto out2;
-                        }
                         continue;
                 }
                 ret = spu_process_events(ctx);