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authorArnd Bergmann <arnd@arndb.de>2006-10-04 19:26:15 +0400
committerPaul Mackerras <paulus@samba.org>2006-10-05 03:21:01 +0400
commit6263203ed6e9ff107129a1ebe613290b342a4465 (patch)
treedc7d68b783fed2b5ffcb8905c62086ebe078368b /include/asm-powerpc/spu.h
parent9add11daeee2f6d69f6b86237f197824332a4a3b (diff)
downloadlinux-6263203ed6e9ff107129a1ebe613290b342a4465.tar.xz
[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>
Diffstat (limited to 'include/asm-powerpc/spu.h')
-rw-r--r--include/asm-powerpc/spu.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-powerpc/spu.h b/include/asm-powerpc/spu.h
index 87cc21e21946..83b6dae48efc 100644
--- a/include/asm-powerpc/spu.h
+++ b/include/asm-powerpc/spu.h
@@ -181,7 +181,10 @@ extern struct spufs_calls {
* Flags for sys_spu_create.
*/
#define SPU_CREATE_EVENTS_ENABLED 0x0001
-#define SPU_CREATE_FLAG_ALL 0x0001 /* mask of all valid flags */
+#define SPU_CREATE_GANG 0x0002
+
+#define SPU_CREATE_FLAG_ALL 0x0003 /* mask of all valid flags */
+
#ifdef CONFIG_SPU_FS_MODULE
int register_spu_syscalls(struct spufs_calls *calls);