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Subject[PATCH 14/22] spufs: use SPU master control to prevent wild SPU execution
When the user changes the runcontrol register, an SPU might be
running without a process being attached to it and waiting for
events. In order to prevent this, make sure we always disable
the priv1 master control when we're not inside of spu_run.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
---
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/hw_ops.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/hw_ops.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/hw_ops.c
@@ -216,13 +216,26 @@ static void spu_hw_runcntl_write(struct
spin_unlock_irq(&ctx->spu->register_lock);
}

-static void spu_hw_runcntl_stop(struct spu_context *ctx)
+static void spu_hw_master_start(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);
+ struct spu *spu = ctx->spu;
+ u64 sr1;
+
+ spin_lock_irq(&spu->register_lock);
+ sr1 = spu_mfc_sr1_get(spu) | MFC_STATE1_MASTER_RUN_CONTROL_MASK;
+ spu_mfc_sr1_set(spu, sr1);
+ spin_unlock_irq(&spu->register_lock);
+}
+
+static void spu_hw_master_stop(struct spu_context *ctx)
+{
+ struct spu *spu = ctx->spu;
+ u64 sr1;
+
+ spin_lock_irq(&spu->register_lock);
+ sr1 = spu_mfc_sr1_get(spu) & ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
+ spu_mfc_sr1_set(spu, sr1);
+ spin_unlock_irq(&spu->register_lock);
}

static int spu_hw_set_mfc_query(struct spu_context * ctx, u32 mask, u32 mode)
@@ -295,7 +308,8 @@ struct spu_context_ops spu_hw_ops = {
.status_read = spu_hw_status_read,
.get_ls = spu_hw_get_ls,
.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,
.read_mfc_tagstatus = spu_hw_read_mfc_tagstatus,
.get_mfc_free_elements = spu_hw_get_mfc_free_elements,
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/backing_ops.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/backing_ops.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/backing_ops.c
@@ -280,9 +280,26 @@ static void spu_backing_runcntl_write(st
spin_unlock(&ctx->csa.register_lock);
}

-static void spu_backing_runcntl_stop(struct spu_context *ctx)
+static void spu_backing_master_start(struct spu_context *ctx)
{
- spu_backing_runcntl_write(ctx, SPU_RUNCNTL_STOP);
+ struct spu_state *csa = &ctx->csa;
+ u64 sr1;
+
+ spin_lock(&csa->register_lock);
+ sr1 = csa->priv1.mfc_sr1_RW | MFC_STATE1_MASTER_RUN_CONTROL_MASK;
+ csa->priv1.mfc_sr1_RW = sr1;
+ spin_unlock(&csa->register_lock);
+}
+
+static void spu_backing_master_stop(struct spu_context *ctx)
+{
+ struct spu_state *csa = &ctx->csa;
+ u64 sr1;
+
+ spin_lock(&csa->register_lock);
+ sr1 = csa->priv1.mfc_sr1_RW & ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
+ csa->priv1.mfc_sr1_RW = sr1;
+ spin_unlock(&csa->register_lock);
}

static int spu_backing_set_mfc_query(struct spu_context * ctx, u32 mask,
@@ -347,7 +364,8 @@ struct spu_context_ops spu_backing_ops =
.status_read = spu_backing_status_read,
.get_ls = spu_backing_get_ls,
.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,
.read_mfc_tagstatus = spu_backing_read_mfc_tagstatus,
.get_mfc_free_elements = spu_backing_get_mfc_free_elements,
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/spufs.h
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/spufs.h
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -116,7 +116,8 @@ struct spu_context_ops {
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);
+ 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);
u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
u32 (*get_mfc_free_elements)(struct spu_context *ctx);
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/context.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/context.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/context.c
@@ -122,29 +122,29 @@ void spu_unmap_mappings(struct spu_conte

int spu_acquire_exclusive(struct spu_context *ctx)
{
- int ret = 0;
+ int ret = 0;

- down_write(&ctx->state_sema);
- /* ctx is about to be freed, can't acquire any more */
- if (!ctx->owner) {
- ret = -EINVAL;
- goto out;
- }
-
- if (ctx->state == SPU_STATE_SAVED) {
- ret = spu_activate(ctx, 0);
- if (ret)
- goto out;
- ctx->state = SPU_STATE_RUNNABLE;
- } else {
- /* We need to exclude userspace access to the context. */
- spu_unmap_mappings(ctx);
- }
+ down_write(&ctx->state_sema);
+ /* ctx is about to be freed, can't acquire any more */
+ if (!ctx->owner) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (ctx->state == SPU_STATE_SAVED) {
+ ret = spu_activate(ctx, 0);
+ if (ret)
+ goto out;
+ ctx->state = SPU_STATE_RUNNABLE;
+ } else {
+ /* We need to exclude userspace access to the context. */
+ spu_unmap_mappings(ctx);
+ }

out:
- if (ret)
- up_write(&ctx->state_sema);
- return ret;
+ if (ret)
+ up_write(&ctx->state_sema);
+ return ret;
}

int spu_acquire_runnable(struct spu_context *ctx)
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/inode.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/inode.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/inode.c
@@ -248,8 +248,13 @@ static int spu_setup_isolated(struct spu
if (!isolated_loader)
return -ENODEV;

- if ((ret = spu_acquire_exclusive(ctx)) != 0)
- return ret;
+ /* prevent concurrent operation with spu_run */
+ down(&ctx->run_sema);
+ ctx->ops->master_start(ctx);
+
+ ret = spu_acquire_exclusive(ctx);
+ if (ret)
+ goto out;

mfc_cntl = &ctx->spu->priv2->mfc_control_RW;

@@ -315,12 +320,14 @@ out_drop_priv:

out_unlock:
spu_release_exclusive(ctx);
+out:
+ ctx->ops->master_stop(ctx);
+ up(&ctx->run_sema);
return ret;
}

int spu_recycle_isolated(struct spu_context *ctx)
{
- ctx->ops->runcntl_stop(ctx);
return spu_setup_isolated(ctx);
}

@@ -435,6 +442,8 @@ out:
if (ret >= 0 && (flags & SPU_CREATE_ISOLATE)) {
int setup_err = spu_setup_isolated(
SPUFS_I(dentry->d_inode)->i_ctx);
+ /* FIXME: clean up context again on failure to avoid
+ leak. */
if (setup_err)
ret = setup_err;
}
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/run.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/run.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/run.c
@@ -207,6 +207,7 @@ long spufs_run_spu(struct file *file, st
if (down_interruptible(&ctx->run_sema))
return -ERESTARTSYS;

+ ctx->ops->master_start(ctx);
ctx->event_return = 0;
ret = spu_run_init(ctx, npc);
if (ret)
@@ -234,7 +235,7 @@ long spufs_run_spu(struct file *file, st
} while (!ret && !(status & (SPU_STATUS_STOPPED_BY_STOP |
SPU_STATUS_STOPPED_BY_HALT)));

- ctx->ops->runcntl_stop(ctx);
+ ctx->ops->master_stop(ctx);
ret = spu_run_fini(ctx, npc, &status);
spu_yield(ctx);

--

-
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