sgi-gru: support multiple pagesizes in GRU

Add multiple pagesize support to the GRU driver.

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, 15 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 15507d31e62b..ab118558552e 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -360,6 +360,13 @@ static int gru_try_dropin(struct gru_thread_state *gts,
         if (ret == -2)
                 goto failupm;
 
+        if (!(gts->ts_sizeavail & GRU_SIZEAVAIL(pageshift))) {
+                gts->ts_sizeavail |= GRU_SIZEAVAIL(pageshift);
+                if (atomic || !gru_update_cch(gts, 0)) {
+                        gts->ts_force_cch_reload = 1;
+                        goto failupm;
+                }
+        }
         gru_cb_set_istatus_active(cb);
         tfh_write_restart(tfh, gpa, GAA_RAM, vaddr, asid, write,
                           GRU_PAGESIZE(pageshift));
@@ -535,6 +542,14 @@ int gru_handle_user_call_os(unsigned long cb)
                 gts->ts_force_unload = 1;
         }
 
+        /*
+         * CCH may contain stale data if ts_force_cch_reload is set.
+         */
+        if (gts->ts_gru && gts->ts_force_cch_reload) {
+                gru_update_cch(gts, 0);
+                gts->ts_force_cch_reload = 0;
+        }
+
         ret = -EAGAIN;
         cbrnum = thread_cbr_number(gts, ucbnum);
         if (gts->ts_force_unload) {