gpu: nvgpu: add space query in page and buddy allocs

Amount of free space in the buddy allocator is computed from the
complete capacity minus currently used bytes.

The page allocator just queries its underlying allocator.

Bug 1787771
Bug 200233138

Change-Id: I9b6f5ef90119236a13de14e14cd0a3ee72144a11
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1223761
(cherry picked from commit 0b324a60ebdf67e793ade869c252a8ddd56c04f8)
Reviewed-on: http://git-master/r/1235979
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_allocator_buddy.c b/drivers/gpu/nvgpu/gk20a/gk20a_allocator_buddy.c
index f9fb48b5..a8a031be 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_allocator_buddy.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_allocator_buddy.c
@@ -1090,6 +1090,19 @@ static u64 gk20a_buddy_alloc_end(struct gk20a_allocator *a)
         return ba->end;
 }
 
+static u64 gk20a_buddy_alloc_space(struct gk20a_allocator *a)
+{
+        struct gk20a_buddy_allocator *ba = a->priv;
+        u64 space;
+
+        alloc_lock(a);
+        space = ba->end - ba->start -
+                (ba->bytes_alloced_real - ba->bytes_freed);
+        alloc_unlock(a);
+
+        return space;
+}
+
 /*
  * Print the buddy allocator top level stats. If you pass @s as NULL then the
  * stats are printed to the kernel log. This lets this code be used for
@@ -1180,6 +1193,7 @@ static const struct gk20a_allocator_ops buddy_ops = {
         .length         = gk20a_buddy_alloc_length,
         .end            = gk20a_buddy_alloc_end,
         .inited         = gk20a_buddy_alloc_inited,
+        .space          = gk20a_buddy_alloc_space,
 
         .fini           = gk20a_buddy_allocator_destroy,