gru: collect per-context user statistics

Collect GRU statistics for each user GRU context.  Statistics are kept for
TLB misses & content resource contention.  Add user request for retrieving
the statistics.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/grulib.h b/drivers/misc/sgi-gru/grulib.h
index 87586551d16f..c5865dd19eec 100644
--- a/drivers/misc/sgi-gru/grulib.h
+++ b/drivers/misc/sgi-gru/grulib.h
@@ -50,6 +50,9 @@
 /* For dumpping GRU chiplet state */
 #define GRU_DUMP_CHIPLET_STATE          _IOWR(GRU_IOCTL_NUM, 11, void *)
 
+/* For getting gseg statistics */
+#define GRU_GET_GSEG_STATISTICS         _IOWR(GRU_IOCTL_NUM, 12, void *)
+
 /* For user TLB flushing (primarily for tests) */
 #define GRU_USER_FLUSH_TLB              _IOWR(GRU_IOCTL_NUM, 50, void *)
 
@@ -61,6 +64,21 @@
 
 #define CONTEXT_WINDOW_BYTES(th)        (GRU_GSEG_PAGESIZE * (th))
 #define THREAD_POINTER(p, th)           (p + GRU_GSEG_PAGESIZE * (th))
+#define GSEG_START(cb)                  ((void *)((unsigned long)(cb) & ~(GRU_GSEG_PAGESIZE - 1)))
+
+/*
+ * Statictics kept on a per-GTS basis.
+ */
+struct gts_statistics {
+        unsigned long   fmm_tlbdropin;
+        unsigned long   upm_tlbdropin;
+        unsigned long   context_stolen;
+};
+
+struct gru_get_gseg_statistics_req {
+        unsigned long           gseg;
+        struct gts_statistics   stats;
+};
 
 /*
  * Structure used to pass TLB flush parameters to the driver