[POWERPC] spufs: Add infrastructure needed for gang scheduling

Add the concept of a gang to spufs as a new type of object.
So far, this has no impact whatsover on scheduling, but makes
it possible to add that later.

A new type of object in spufs is now a spu_gang. It is created
with the spu_create system call with the flags argument set
to SPU_CREATE_GANG (0x2). Inside of a spu_gang, it
is then possible to create spu_context objects, which until
now was only possible at the root of spufs.

There is a new member in struct spu_context pointing to
the spu_gang it belongs to, if any. The spu_gang maintains
a list of spu_context structures that are its children.
This information can then be used in the scheduler in the
future.

There is still a bug that needs to be resolved in this
basic infrastructure regarding the order in which objects
are removed. When the spu_gang file descriptor is closed
before the spu_context descriptors, we leak the dentry
and inode for the gang. Any ideas how to cleanly solve
this are appreciated.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 81 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/gang.c b/arch/powerpc/platforms/cell/spufs/gang.c
new file mode 100644
index 000000000000..212ea78f9051
--- /dev/null
+++ b/arch/powerpc/platforms/cell/spufs/gang.c
@@ -0,0 +1,81 @@
+/*
+ * SPU file system
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ *
+ * Author: Arnd Bergmann <arndb@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/list.h>
+#include <linux/slab.h>
+
+#include "spufs.h"
+
+struct spu_gang *alloc_spu_gang(void)
+{
+        struct spu_gang *gang;
+
+        gang = kzalloc(sizeof *gang, GFP_KERNEL);
+        if (!gang)
+                goto out;
+
+        kref_init(&gang->kref);
+        mutex_init(&gang->mutex);
+        INIT_LIST_HEAD(&gang->list);
+
+out:
+        return gang;
+}
+
+static void destroy_spu_gang(struct kref *kref)
+{
+        struct spu_gang *gang;
+        gang = container_of(kref, struct spu_gang, kref);
+        WARN_ON(gang->contexts || !list_empty(&gang->list));
+        kfree(gang);
+}
+
+struct spu_gang *get_spu_gang(struct spu_gang *gang)
+{
+        kref_get(&gang->kref);
+        return gang;
+}
+
+int put_spu_gang(struct spu_gang *gang)
+{
+        return kref_put(&gang->kref, &destroy_spu_gang);
+}
+
+void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
+{
+        mutex_lock(&gang->mutex);
+        ctx->gang = get_spu_gang(gang);
+        list_add(&ctx->gang_list, &gang->list);
+        gang->contexts++;
+        mutex_unlock(&gang->mutex);
+}
+
+void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
+{
+        mutex_lock(&gang->mutex);
+        WARN_ON(ctx->gang != gang);
+        list_del_init(&ctx->gang_list);
+        gang->contexts--;
+        mutex_unlock(&gang->mutex);
+
+        put_spu_gang(gang);
+}