From: Maynard Johnson <[EMAIL PROTECTED]>
This patch adds to the capability of spu_switch_event_register so that
the caller is also notified of currently active SPU tasks.
Exports spu_switch_event_register and spu_switch_event_unregister so
that OProfile can get access to the notifications provided.
Signed-off-by: Maynard Johnson <[EMAIL PROTECTED]>
Signed-off-by: Carl Love <[EMAIL PROTECTED]>
Signed-off-by: Bob Nelson <[EMAIL PROTECTED]>
Acked-by: Arnd Bergmann <[EMAIL PROTECTED]>
Acked-by: Paul Mackerras <[EMAIL PROTECTED]>
---
We would like this patch included in -mm and 2.6.23
Changed "for (node = 0; node < MAX_NUMNODES; node++)" loop to
for_each_online_node(node).
Added comment to memory barrier.
Better info in changelog.
Index: powerpc.git/arch/powerpc/platforms/cell/spufs/sched.c
===================================================================
--- powerpc.git.orig/arch/powerpc/platforms/cell/spufs/sched.c
+++ powerpc.git/arch/powerpc/platforms/cell/spufs/sched.c
@@ -204,21 +204,51 @@ static void spu_remove_from_active_list(
static BLOCKING_NOTIFIER_HEAD(spu_switch_notifier);
-static void spu_switch_notify(struct spu *spu, struct spu_context *ctx)
+void spu_switch_notify(struct spu *spu, struct spu_context *ctx)
{
blocking_notifier_call_chain(&spu_switch_notifier,
ctx ? ctx->object_id : 0, spu);
}
+static void notify_spus_active(void)
+{
+ int node;
+
+ /*
+ * Wake up the active spu_contexts.
+ *
+ * When the awakened processes see their "notify_active" flag is set,
+ * they will call spu_switch_notify();
+ */
+ for_each_online_node(node) {
+ struct spu *spu;
+ mutex_lock(&spu_prio->active_mutex[node]);
+ list_for_each_entry(spu, &spu_prio->active_list[node], list) {
+ struct spu_context *ctx = spu->ctx;
+ set_bit(SPU_SCHED_NOTIFY_ACTIVE, &ctx->sched_flags);
+ mb(); /* make sure any tasks woken up below */
+ /* can see the bit(s) set above */
+ wake_up_all(&ctx->stop_wq);
+ }
+ mutex_unlock(&spu_prio->active_mutex[node]);
+ }
+}
+
int spu_switch_event_register(struct notifier_block * n)
{
- return blocking_notifier_chain_register(&spu_switch_notifier, n);
+ int ret;
+ ret = blocking_notifier_chain_register(&spu_switch_notifier, n);
+ if (!ret)
+ notify_spus_active();
+ return ret;
}
+EXPORT_SYMBOL_GPL(spu_switch_event_register);
int spu_switch_event_unregister(struct notifier_block * n)
{
return blocking_notifier_chain_unregister(&spu_switch_notifier, n);
}
+EXPORT_SYMBOL_GPL(spu_switch_event_unregister);
/**
* spu_bind_context - bind spu context to physical spu
Index: powerpc.git/arch/powerpc/platforms/cell/spufs/spufs.h
===================================================================
--- powerpc.git.orig/arch/powerpc/platforms/cell/spufs/spufs.h
+++ powerpc.git/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -53,6 +53,11 @@ enum spuctx_execution_state {
SPUCTX_UTIL_MAX
};
+/* ctx->sched_flags */
+enum {
+ SPU_SCHED_NOTIFY_ACTIVE,
+};
+
struct spu_context {
struct spu *spu; /* pointer to a physical SPU */
struct spu_state csa; /* SPU context save area. */
@@ -231,6 +236,7 @@ void spu_acquire_saved(struct spu_contex
int spu_activate(struct spu_context *ctx, unsigned long flags);
void spu_deactivate(struct spu_context *ctx);
void spu_yield(struct spu_context *ctx);
+void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
void spu_set_timeslice(struct spu_context *ctx);
void spu_update_sched_info(struct spu_context *ctx);
void __spu_update_sched_info(struct spu_context *ctx);
Index: powerpc.git/arch/powerpc/platforms/cell/spufs/run.c
===================================================================
--- powerpc.git.orig/arch/powerpc/platforms/cell/spufs/run.c
+++ powerpc.git/arch/powerpc/platforms/cell/spufs/run.c
@@ -18,15 +18,17 @@ void spufs_stop_callback(struct spu *spu
wake_up_all(&ctx->stop_wq);
}
-static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
+static inline int spu_stopped(struct spu_context *ctx, u32 *stat)
{
struct spu *spu;
u64 pte_fault;
*stat = ctx->ops->status_read(ctx);
- if (ctx->state != SPU_STATE_RUNNABLE)
- return 1;
+
spu = ctx->spu;
+ if (ctx->state != SPU_STATE_RUNNABLE ||
+ test_bit(SPU_SCHED_NOTIFY_ACTIVE, &ctx->sched_flags))
+ return 1;
pte_fault = spu->dsisr &
(MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED);
return (!(*stat & SPU_STATUS_RUNNING) || pte_fault ||
spu->class_0_pending) ?
@@ -124,7 +126,7 @@ out:
return ret;
}
-static int spu_run_init(struct spu_context *ctx, u32 * npc)
+static int spu_run_init(struct spu_context *ctx, u32 *npc)
{
if (ctx->flags & SPU_CREATE_ISOLATE) {
unsigned long runcntl;
@@ -154,8 +156,8 @@ static int spu_run_init(struct spu_conte
return 0;
}
-static int spu_run_fini(struct spu_context *ctx, u32 * npc,
- u32 * status)
+static int spu_run_fini(struct spu_context *ctx, u32 *npc,
+ u32 *status)
{
int ret = 0;
@@ -293,6 +295,7 @@ long spufs_run_spu(struct file *file, st
u32 *npc, u32 *event)
{
int ret;
+ struct spu *spu;
u32 status;
if (mutex_lock_interruptible(&ctx->run_mutex))
@@ -326,8 +329,16 @@ long spufs_run_spu(struct file *file, st
do {
ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, &status));
+ spu = ctx->spu;
if (unlikely(ret))
break;
+ if (unlikely(test_and_clear_bit(SPU_SCHED_NOTIFY_ACTIVE,
+ &ctx->sched_flags))) {
+ if (!(status & SPU_STATUS_STOPPED_BY_STOP)) {
+ spu_switch_notify(spu, ctx);
+ continue;
+ }
+ }
if ((status & SPU_STATUS_STOPPED_BY_STOP) &&
(status >> SPU_STOP_STATUS_SHIFT == 0x2104)) {
ret = spu_process_callback(ctx);
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