gpu: nvgpu: Record size of page table level

Record size of each page table level. The size of level 0 depends
on size of the address space, and we generally do not support the
whole address space.

Change-Id: Iab47505af1a641e193d9e98a2246e522813f221a
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/729730
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-on: http://git-master/r/737531
Reviewed-by: Alexander Van Brunt <avanbrunt@nvidia.com>
Tested-by: Alexander Van Brunt <avanbrunt@nvidia.com>

2 files changed, 6 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index bde8afae..4c0a773c 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -1984,9 +1984,10 @@ static int update_gmmu_level_locked(struct vm_gk20a *vm,
                                 pte->entries =
                                         kzalloc(sizeof(struct gk20a_mm_entry) *
                                                 num_entries, GFP_KERNEL);
-                                pte->pgsz = pgsz_idx;
                                 if (!pte->entries)
                                         return -ENOMEM;
+                                pte->pgsz = pgsz_idx;
+                                pte->num_entries = num_entries;
                         }
                         next_pte = pte->entries + pde_i;
 
@@ -2153,17 +2154,16 @@ static void gk20a_vm_free_entries(struct vm_gk20a *vm,
                                   struct gk20a_mm_entry *parent,
                                   int level)
 {
-        const struct gk20a_mmu_level *l = &vm->mmu_levels[level];
-        int num_entries = 1 << (l->hi_bit[parent->pgsz] - l->lo_bit[parent->pgsz]);
         int i;
 
         if (parent->entries)
-                for (i = 0; i < num_entries; i++)
+                for (i = 0; i < parent->num_entries; i++)
                         gk20a_vm_free_entries(vm, &parent->entries[i], level+1);
 
         if (parent->size)
                 free_gmmu_pages(vm, parent);
         kfree(parent->entries);
+        parent->entries = NULL;
 }
 
 static void gk20a_vm_remove_support_nofree(struct vm_gk20a *vm)
@@ -2288,6 +2288,7 @@ int gk20a_init_vm(struct mm_gk20a *mm,
                                    &pde_lo, &pde_hi);
         vm->pdb.entries = kzalloc(sizeof(struct gk20a_mm_entry) *
                         (pde_hi + 1), GFP_KERNEL);
+        vm->pdb.num_entries = pde_hi + 1;
 
         if (!vm->pdb.entries)
                 return -ENOMEM;
diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index df9ebec3..f6806309 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -150,6 +150,7 @@ struct gk20a_mm_entry {
         size_t size;
         int pgsz;
         struct gk20a_mm_entry *entries;
+        int num_entries;
 };
 
 struct priv_cmd_queue {