6 files changed, 99 insertions, 6 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 0de8e114e6b6..8ca330671ad1 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -1531,3 +1531,25 @@ struct tree_descr spufs_dir_contents[] = {
         { "object-id", &spufs_object_id_ops, 0666, },
         {},
 };
+
+struct tree_descr spufs_dir_nosched_contents[] = {
+        { "mem",  &spufs_mem_fops,  0666, },
+        { "mbox", &spufs_mbox_fops, 0444, },
+        { "ibox", &spufs_ibox_fops, 0444, },
+        { "wbox", &spufs_wbox_fops, 0222, },
+        { "mbox_stat", &spufs_mbox_stat_fops, 0444, },
+        { "ibox_stat", &spufs_ibox_stat_fops, 0444, },
+        { "wbox_stat", &spufs_wbox_stat_fops, 0444, },
+        { "signal1", &spufs_signal1_fops, 0666, },
+        { "signal2", &spufs_signal2_fops, 0666, },
+        { "signal1_type", &spufs_signal1_type, 0666, },
+        { "signal2_type", &spufs_signal2_type, 0666, },
+        { "mss", &spufs_mss_fops, 0666, },
+        { "mfc", &spufs_mfc_fops, 0666, },
+        { "cntl", &spufs_cntl_fops,  0666, },
+        { "npc", &spufs_npc_ops, 0666, },
+        { "psmap", &spufs_psmap_fops, 0666, },
+        { "phys-id", &spufs_id_ops, 0666, },
+        { "object-id", &spufs_object_id_ops, 0666, },
+        {},
+};
diff --git a/arch/powerpc/platforms/cell/spufs/hw_ops.c b/arch/powerpc/platforms/cell/spufs/hw_ops.c
index efc452e71ab0..2ad534a04be8 100644
--- a/arch/powerpc/platforms/cell/spufs/hw_ops.c
+++ b/arch/powerpc/platforms/cell/spufs/hw_ops.c
@@ -219,8 +219,11 @@ static char *spu_hw_get_ls(struct spu_context *ctx)
 
 static void spu_hw_runcntl_write(struct spu_context *ctx, u32 val)
 {
-        eieio();
+        spin_lock_irq(&ctx->spu->register_lock);
+        if (val & SPU_RUNCNTL_ISOLATE)
+                out_be64(&ctx->spu->priv2->spu_privcntl_RW, 4LL);
         out_be32(&ctx->spu->problem->spu_runcntl_RW, val);
+        spin_unlock_irq(&ctx->spu->register_lock);
 }
 
 static void spu_hw_runcntl_stop(struct spu_context *ctx)
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 427d00a4f6a0..787ae71a6859 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -258,7 +258,12 @@ spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 
         inode->i_op = &spufs_dir_inode_operations;
         inode->i_fop = &simple_dir_operations;
-        ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
+        if (flags & SPU_CREATE_NOSCHED)
+                ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
+                                         mode, ctx);
+        else
+                ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
+
         if (ret)
                 goto out_free_ctx;
 
@@ -307,6 +312,16 @@ static int spufs_create_context(struct inode *inode,
 {
         int ret;
 
+        ret = -EPERM;
+        if ((flags & SPU_CREATE_NOSCHED) &&
+            !capable(CAP_SYS_NICE))
+                goto out_unlock;
+
+        ret = -EINVAL;
+        if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
+            == SPU_CREATE_ISOLATE)
+                goto out_unlock;
+
         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
         if (ret)
                 goto out_unlock;
diff --git a/arch/powerpc/platforms/cell/spufs/run.c b/arch/powerpc/platforms/cell/spufs/run.c
index 63df8cf4ba16..0c03a04b6a30 100644
--- a/arch/powerpc/platforms/cell/spufs/run.c
+++ b/arch/powerpc/platforms/cell/spufs/run.c
@@ -51,11 +51,17 @@ static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
 static inline int spu_run_init(struct spu_context *ctx, u32 * npc)
 {
         int ret;
+        unsigned long runcntl = SPU_RUNCNTL_RUNNABLE;
 
         if ((ret = spu_acquire_runnable(ctx)) != 0)
                 return ret;
-        ctx->ops->npc_write(ctx, *npc);
-        ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
+
+        if (ctx->flags & SPU_CREATE_ISOLATE)
+                runcntl |= SPU_RUNCNTL_ISOLATE;
+        else
+                ctx->ops->npc_write(ctx, *npc);
+
+        ctx->ops->runcntl_write(ctx, runcntl);
         return 0;
 }
 
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h
index a0f55ca2d488..b17b809ecd77 100644
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -135,6 +135,7 @@ struct spufs_inode_info {
         container_of(inode, struct spufs_inode_info, vfs_inode)
 
 extern struct tree_descr spufs_dir_contents[];
+extern struct tree_descr spufs_dir_nosched_contents[];
 
 /* system call implementation */
 long spufs_run_spu(struct file *file,
diff --git a/arch/powerpc/platforms/cell/spufs/switch.c b/arch/powerpc/platforms/cell/spufs/switch.c
index b85347ff6b22..b47fb50ac2c1 100644
--- a/arch/powerpc/platforms/cell/spufs/switch.c
+++ b/arch/powerpc/platforms/cell/spufs/switch.c
@@ -1916,6 +1916,51 @@ static void save_lscsa(struct spu_state *prev, struct spu *spu)
         wait_spu_stopped(prev, spu);    /* Step 57. */
 }
 
+static void force_spu_isolate_exit(struct spu *spu)
+{
+        struct spu_problem __iomem *prob = spu->problem;
+        struct spu_priv2 __iomem *priv2 = spu->priv2;
+
+        /* Stop SPE execution and wait for completion. */
+        out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
+        iobarrier_rw();
+        POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING);
+
+        /* Restart SPE master runcntl. */
+        spu_mfc_sr1_set(spu, MFC_STATE1_MASTER_RUN_CONTROL_MASK);
+        iobarrier_w();
+
+        /* Initiate isolate exit request and wait for completion. */
+        out_be64(&priv2->spu_privcntl_RW, 4LL);
+        iobarrier_w();
+        out_be32(&prob->spu_runcntl_RW, 2);
+        iobarrier_rw();
+        POLL_WHILE_FALSE((in_be32(&prob->spu_status_R)
+                                & SPU_STATUS_STOPPED_BY_STOP));
+
+        /* Reset load request to normal. */
+        out_be64(&priv2->spu_privcntl_RW, SPU_PRIVCNT_LOAD_REQUEST_NORMAL);
+        iobarrier_w();
+}
+
+/**
+ * stop_spu_isolate
+ *      Check SPU run-control state and force isolated
+ *      exit function as necessary.
+ */
+static void stop_spu_isolate(struct spu *spu)
+{
+        struct spu_problem __iomem *prob = spu->problem;
+
+        if (in_be32(&prob->spu_status_R) & SPU_STATUS_ISOLATED_STATE) {
+                /* The SPU is in isolated state; the only way
+                 * to get it out is to perform an isolated
+                 * exit (clean) operation.
+                 */
+                force_spu_isolate_exit(spu);
+        }
+}
+
 static void harvest(struct spu_state *prev, struct spu *spu)
 {
         /*
@@ -1928,6 +1973,7 @@ static void harvest(struct spu_state *prev, struct spu *spu)
         inhibit_user_access(prev, spu);         /* Step 3.  */
         terminate_spu_app(prev, spu);           /* Step 4.  */
         set_switch_pending(prev, spu);          /* Step 5.  */
+        stop_spu_isolate(spu);                  /* NEW.     */
         remove_other_spu_access(prev, spu);     /* Step 6.  */
         suspend_mfc(prev, spu);                 /* Step 7.  */
         wait_suspend_mfc_complete(prev, spu);   /* Step 8.  */
@@ -2096,11 +2142,11 @@ int spu_save(struct spu_state *prev, struct spu *spu)
         acquire_spu_lock(spu);          /* Step 1.     */
         rc = __do_spu_save(prev, spu);  /* Steps 2-53. */
         release_spu_lock(spu);
-        if (rc) {
+        if (rc != 0 && rc != 2 && rc != 6) {
                 panic("%s failed on SPU[%d], rc=%d.\n",
                       __func__, spu->number, rc);
         }
-        return rc;
+        return 0;
 }
 EXPORT_SYMBOL_GPL(spu_save);