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, 11 insertions, 6 deletions

diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c
index 5fc7b5ecde66..ec3f7a17d221 100644
--- a/drivers/misc/sgi-gru/grumain.c
+++ b/drivers/misc/sgi-gru/grumain.c
@@ -326,6 +326,7 @@ static struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
         gts->ts_vma = vma;
         gts->ts_tlb_int_select = -1;
         gts->ts_gms = gru_register_mmu_notifier();
+        gts->ts_sizeavail = GRU_SIZEAVAIL(PAGE_SHIFT);
         if (!gts->ts_gms)
                 goto err;
 
@@ -552,7 +553,8 @@ static void gru_load_context(struct gru_thread_state *gts)
                 cch->tlb_int_select = gts->ts_tlb_int_select;
         }
         cch->tfm_done_bit_enable = 0;
-        err = cch_allocate(cch, asid, gts->ts_cbr_map, gts->ts_dsr_map);
+        err = cch_allocate(cch, asid, gts->ts_sizeavail, gts->ts_cbr_map,
+                                gts->ts_dsr_map);
         if (err) {
                 gru_dbg(grudev,
                         "err %d: cch %p, gts %p, cbr 0x%lx, dsr 0x%lx\n",
@@ -573,11 +575,12 @@ static void gru_load_context(struct gru_thread_state *gts)
 /*
  * Update fields in an active CCH:
  *      - retarget interrupts on local blade
+ *      - update sizeavail mask
  *      - force a delayed context unload by clearing the CCH asids. This
  *        forces TLB misses for new GRU instructions. The context is unloaded
  *        when the next TLB miss occurs.
  */
-static int gru_update_cch(struct gru_thread_state *gts, int int_select)
+int gru_update_cch(struct gru_thread_state *gts, int force_unload)
 {
         struct gru_context_configuration_handle *cch;
         struct gru_state *gru = gts->ts_gru;
@@ -591,9 +594,11 @@ static int gru_update_cch(struct gru_thread_state *gts, int int_select)
                         goto exit;
                 if (cch_interrupt(cch))
                         BUG();
-                if (int_select >= 0) {
-                        gts->ts_tlb_int_select = int_select;
-                        cch->tlb_int_select = int_select;
+                if (!force_unload) {
+                        for (i = 0; i < 8; i++)
+                                cch->sizeavail[i] = gts->ts_sizeavail;
+                        gts->ts_tlb_int_select = gru_cpu_fault_map_id();
+                        cch->tlb_int_select = gru_cpu_fault_map_id();
                 } else {
                         for (i = 0; i < 8; i++)
                                 cch->asid[i] = 0;
@@ -625,7 +630,7 @@ static int gru_retarget_intr(struct gru_thread_state *gts)
 
         gru_dbg(grudev, "retarget from %d to %d\n", gts->ts_tlb_int_select,
                 gru_cpu_fault_map_id());
-        return gru_update_cch(gts, gru_cpu_fault_map_id());
+        return gru_update_cch(gts, 0);
 }