[POWERPC] spufs: add a phys-id attribute to each SPU context

For performance analysis, it is often interesting to know
which physical SPE a thread is currently running on, and,
more importantly, if it is running at all.

This patch adds a simple attribute to each SPU directory
with that information.
The attribute is read-only and called 'phys-id'. It contains
an ascii string with the number of the physical SPU (e.g.
"0x5"), or alternatively the string "0xffffffff" (32 bit -1)
when it is not running at all at the time that the file
is read.

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

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 3bc00913fe18..80c02660e617 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -1328,6 +1328,22 @@ static u64 spufs_srr0_get(void *data)
 DEFINE_SIMPLE_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
                         "%llx\n")
 
+static u64 spufs_id_get(void *data)
+{
+        struct spu_context *ctx = data;
+        u64 num;
+
+        spu_acquire(ctx);
+        if (ctx->state == SPU_STATE_RUNNABLE)
+                num = ctx->spu->number;
+        else
+                num = (unsigned int)-1;
+        spu_release(ctx);
+
+        return num;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_id_ops, spufs_id_get, 0, "0x%llx\n")
+
 struct tree_descr spufs_dir_contents[] = {
         { "mem",  &spufs_mem_fops,  0666, },
         { "regs", &spufs_regs_fops,  0666, },
@@ -1351,5 +1367,6 @@ struct tree_descr spufs_dir_contents[] = {
         { "spu_tag_mask", &spufs_spu_tag_mask_ops, 0666, },
         { "event_mask", &spufs_event_mask_ops, 0666, },
         { "srr0", &spufs_srr0_ops, 0666, },
+        { "phys-id", &spufs_id_ops, 0666, },
         {},
 };