Subject: Enable SPU switch notification to detect currently active SPU tasks.
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. It also exports
spu_switch_event_register and spu_switch_event_unregister.
Signed-off-by: Maynard Johnson <[email protected]>
Index: linux-2.6.19-rc6-arnd1+patches/arch/powerpc/platforms/cell/spufs/sched.c
===================================================================
--- linux-2.6.19-rc6-arnd1+patches.orig/arch/powerpc/platforms/cell/spufs/sched.c 2006-12-04 10:56:04.730698720 -0600
+++ linux-2.6.19-rc6-arnd1+patches/arch/powerpc/platforms/cell/spufs/sched.c 2007-01-11 09:45:37.918333128 -0600
@@ -46,6 +46,8 @@
#define SPU_MIN_TIMESLICE (100 * HZ / 1000)
+int notify_active[MAX_NUMNODES];
+
#define SPU_BITMAP_SIZE (((MAX_PRIO+BITS_PER_LONG)/BITS_PER_LONG)+1)
struct spu_prio_array {
unsigned long bitmap[SPU_BITMAP_SIZE];
@@ -81,18 +83,45 @@
static void spu_switch_notify(struct spu *spu, struct spu_context *ctx)
{
blocking_notifier_call_chain(&spu_switch_notifier,
- ctx ? ctx->object_id : 0, spu);
+ ctx ? ctx->object_id : 0, spu);
+}
+
+static void notify_spus_active(void)
+{
+ int node;
+ /* Wake up the active spu_contexts. When the awakened processes
+ * sees their notify_active flag is set, they will call
+ * spu_notify_already_active().
+ */
+ for (node = 0; node < MAX_NUMNODES; 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;
+ wake_up_all(&ctx->stop_wq);
+ notify_active[ctx->spu->number] = 1;
+ smp_mb();
+ }
+ mutex_unlock(&spu_prio->active_mutex[node]);
+ }
+ yield();
}
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);
static inline void bind_context(struct spu *spu, struct spu_context *ctx)
@@ -250,6 +279,14 @@
return spu_get_idle(ctx, flags);
}
+void spu_notify_already_active(struct spu_context *ctx)
+{
+ struct spu *spu = ctx->spu;
+ if (!spu)
+ return;
+ spu_switch_notify(spu, ctx);
+}
+
/* The three externally callable interfaces
* for the scheduler begin here.
*
Index: linux-2.6.19-rc6-arnd1+patches/arch/powerpc/platforms/cell/spufs/spufs.h
===================================================================
--- linux-2.6.19-rc6-arnd1+patches.orig/arch/powerpc/platforms/cell/spufs/spufs.h 2007-01-08 18:18:40.093354608 -0600
+++ linux-2.6.19-rc6-arnd1+patches/arch/powerpc/platforms/cell/spufs/spufs.h 2007-01-08 18:31:03.610345792 -0600
@@ -183,6 +183,7 @@
void spu_yield(struct spu_context *ctx);
int __init spu_sched_init(void);
void __exit spu_sched_exit(void);
+void spu_notify_already_active(struct spu_context *ctx);
extern char *isolated_loader;
Index: linux-2.6.19-rc6-arnd1+patches/arch/powerpc/platforms/cell/spufs/run.c
===================================================================
--- linux-2.6.19-rc6-arnd1+patches.orig/arch/powerpc/platforms/cell/spufs/run.c 2007-01-08 18:33:51.979311680 -0600
+++ linux-2.6.19-rc6-arnd1+patches/arch/powerpc/platforms/cell/spufs/run.c 2007-01-11 10:17:20.777344984 -0600
@@ -10,6 +10,8 @@
#include "spufs.h"
+extern int notify_active[MAX_NUMNODES];
+
/* interrupt-level stop callback function. */
void spufs_stop_callback(struct spu *spu)
{
@@ -45,7 +47,9 @@
u64 pte_fault;
*stat = ctx->ops->status_read(ctx);
- if (ctx->state != SPU_STATE_RUNNABLE)
+ smp_mb();
+
+ if (ctx->state != SPU_STATE_RUNNABLE || notify_active[ctx->spu->number])
return 1;
spu = ctx->spu;
pte_fault = spu->dsisr &
@@ -319,6 +323,11 @@
ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, &status));
if (unlikely(ret))
break;
+ if (unlikely(notify_active[ctx->spu->number])) {
+ notify_active[ctx->spu->number] = 0;
+ if (!(status & SPU_STATUS_STOPPED_BY_STOP))
+ spu_notify_already_active(ctx);
+ }
if ((status & SPU_STATUS_STOPPED_BY_STOP) &&
(status >> SPU_STOP_STATUS_SHIFT == 0x2104)) {
ret = spu_process_callback(ctx);
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