Subject: [patch 2/2] Cell: Wrap master run control bit

From: Geoff Levand <[email-masked]>
Date: Tue, 04 Sep 2007 04:54:43 -0700

From: Masato Noguchi <[email-masked]>

Add platform specific SPU run control routines.

The current spufs_run_spu() implementation uses the SPU master
run control bit (MFC_SR1[S]) to control SPE execution, but the
PS3 hypervisor does not support the use of this feature.  This
change adds run control wrapper routines.  The  bare metal
routines use the master run control bit, and the PS3 specific
routines use the priv2 run control register.

Signed-off-by: Masato Noguchi <[email-masked]>
Signed-off-by: Geoff Levand <[email-masked]>
---

Arnd, please consider for 2.6.24.

 arch/powerpc/platforms/cell/spu_manage.c        |   15 +++++++++++++++
 arch/powerpc/platforms/cell/spufs/backing_ops.c |    6 ++++++
 arch/powerpc/platforms/cell/spufs/hw_ops.c      |   10 ++++++++++
 arch/powerpc/platforms/cell/spufs/run.c         |    4 ++--
 arch/powerpc/platforms/cell/spufs/spufs.h       |    1 +
 arch/powerpc/platforms/ps3/spu.c                |   14 ++++++++++++++
 include/asm-powerpc/spu_priv1.h                 |   15 +++++++++++++++
 7 files changed, 63 insertions(+), 2 deletions(-)

--- a/arch/powerpc/platforms/cell/spu_manage.c
+++ b/arch/powerpc/platforms/cell/spu_manage.c
@@ -35,6 +35,7 @@
 #include <asm/firmware.h>
 #include <asm/prom.h>
 
+#include "spufs/spufs.h"
 #include "interrupt.h"
 
 struct device_node *spu_devnode(struct spu *spu)
@@ -369,6 +370,18 @@ static int of_destroy_spu(struct spu *sp
 	return 0;
 }
 
+static int enable_spu_by_master_run(struct spu_context *ctx)
+{
+	ctx->ops->master_start(ctx);
+	return 0;
+}
+
+static int disable_spu_by_master_run(struct spu_context *ctx)
+{
+	ctx->ops->master_stop(ctx);
+	return 0;
+}
+
 /* Hardcoded affinity idxs for qs20 */
 #define QS20_SPES_PER_BE 8
 static int qs20_reg_idxs[QS20_SPES_PER_BE] =   { 0, 2, 4, 6, 7, 5, 3, 1 };
@@ -535,5 +548,7 @@ const struct spu_management_ops spu_mana
 	.enumerate_spus = of_enumerate_spus,
 	.create_spu = of_create_spu,
 	.destroy_spu = of_destroy_spu,
+	.enable_spu = enable_spu_by_master_run,
+	.disable_spu = disable_spu_by_master_run,
 	.init_affinity = init_affinity,
 };
--- a/arch/powerpc/platforms/cell/spufs/backing_ops.c
+++ b/arch/powerpc/platforms/cell/spufs/backing_ops.c
@@ -285,6 +285,11 @@ static void spu_backing_runcntl_write(st
 	spin_unlock(&ctx->csa.register_lock);
 }
 
+static void spu_backing_runcntl_stop(struct spu_context *ctx)
+{
+	spu_backing_runcntl_write(ctx, SPU_RUNCNTL_STOP);
+}
+
 static void spu_backing_master_start(struct spu_context *ctx)
 {
 	struct spu_state *csa = &ctx->csa;
@@ -381,6 +386,7 @@ struct spu_context_ops spu_backing_ops =
 	.get_ls = spu_backing_get_ls,
 	.runcntl_read = spu_backing_runcntl_read,
 	.runcntl_write = spu_backing_runcntl_write,
+	.runcntl_stop = spu_backing_runcntl_stop,
 	.master_start = spu_backing_master_start,
 	.master_stop = spu_backing_master_stop,
 	.set_mfc_query = spu_backing_set_mfc_query,
--- a/arch/powerpc/platforms/cell/spufs/hw_ops.c
+++ b/arch/powerpc/platforms/cell/spufs/hw_ops.c
@@ -220,6 +220,15 @@ static void spu_hw_runcntl_write(struct 
 	spin_unlock_irq(&ctx->spu->register_lock);
 }
 
+static void spu_hw_runcntl_stop(struct spu_context *ctx)
+{
+	spin_lock_irq(&ctx->spu->register_lock);
+	out_be32(&ctx->spu->problem->spu_runcntl_RW, SPU_RUNCNTL_STOP);
+	while(in_be32(&ctx->spu->problem->spu_status_R) & SPU_STATUS_RUNNING)
+		cpu_relax();
+	spin_unlock_irq(&ctx->spu->register_lock);
+}
+
 static void spu_hw_master_start(struct spu_context *ctx)
 {
 	struct spu *spu = ctx->spu;
@@ -321,6 +330,7 @@ struct spu_context_ops spu_hw_ops = {
 	.get_ls = spu_hw_get_ls,
 	.runcntl_read = spu_hw_runcntl_read,
 	.runcntl_write = spu_hw_runcntl_write,
+	.runcntl_stop = spu_hw_runcntl_stop,
 	.master_start = spu_hw_master_start,
 	.master_stop = spu_hw_master_stop,
 	.set_mfc_query = spu_hw_set_mfc_query,
--- a/arch/powerpc/platforms/cell/spufs/run.c
+++ b/arch/powerpc/platforms/cell/spufs/run.c
@@ -302,7 +302,7 @@ long spufs_run_spu(struct spu_context *c
 	if (mutex_lock_interruptible(&ctx->run_mutex))
 		return -ERESTARTSYS;
 
-	ctx->ops->master_start(ctx);
+	spu_enable_spu(ctx);
 	ctx->event_return = 0;
 
 	spu_acquire(ctx);
@@ -376,7 +376,7 @@ long spufs_run_spu(struct spu_context *c
 		ctx->stats.libassist++;

-	ctx->ops->master_stop(ctx);
+	spu_disable_spu(ctx);
 	ret = spu_run_fini(ctx, npc, &status);
 	spu_yield(ctx);
 
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -170,6 +170,7 @@ struct spu_context_ops {
 	char*(*get_ls) (struct spu_context * ctx);
 	 u32 (*runcntl_read) (struct spu_context * ctx);
 	void (*runcntl_write) (struct spu_context * ctx, u32 data);
+	void (*runcntl_stop) (struct spu_context * ctx);
 	void (*master_start) (struct spu_context * ctx);
 	void (*master_stop) (struct spu_context * ctx);
 	int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
--- a/arch/powerpc/platforms/ps3/spu.c
+++ b/arch/powerpc/platforms/ps3/spu.c
@@ -28,6 +28,7 @@
 #include <asm/spu_priv1.h>
 #include <asm/lv1call.h>
 
+#include "../cell/spufs/spufs.h"
 #include "platform.h"
 
 /* spu_management_ops */
@@ -419,10 +420,23 @@ static int ps3_init_affinity(void)
 	return 0;
 }
 
+static int ps3_enable_spu(struct spu_context *ctx)
+{
+	return -ENOSYS;
+}
+
+static int ps3_disable_spu(struct spu_context *ctx)
+{
+	ctx->ops->runcntl_stop(ctx);
+	return -ENOSYS;
+}
+
 const struct spu_management_ops spu_management_ps3_ops = {
 	.enumerate_spus = ps3_enumerate_spus,
 	.create_spu = ps3_create_spu,
 	.destroy_spu = ps3_destroy_spu,
+	.enable_spu = ps3_enable_spu,
+	.disable_spu = ps3_disable_spu,
 	.init_affinity = ps3_init_affinity,
 };
 
--- a/include/asm-powerpc/spu_priv1.h
+++ b/include/asm-powerpc/spu_priv1.h
@@ -24,6 +24,7 @@
 #include <linux/types.h>
 
 struct spu;
+struct spu_context;
 
 /* access to priv1 registers */
 
@@ -178,6 +179,8 @@ struct spu_management_ops {
 	int (*enumerate_spus)(int (*fn)(void *data));
 	int (*create_spu)(struct spu *spu, void *data);
 	int (*destroy_spu)(struct spu *spu);
+	int (*enable_spu)(struct spu_context *ctx);
+	int (*disable_spu)(struct spu_context *ctx);
 	int (*init_affinity)(void);
 };
 
@@ -207,6 +210,18 @@ spu_init_affinity (void)
 	return spu_management_ops->init_affinity();
 }
 
+static inline int
+spu_enable_spu (struct spu_context *ctx)
+{
+	return spu_management_ops->enable_spu(ctx);
+}
+
+static inline int
+spu_disable_spu (struct spu_context *ctx)
+{
+	return spu_management_ops->disable_spu(ctx);
+}
+
 /*
  * The declarations folowing are put here for convenience
  * and only intended to be used by the platform setup code.