gpu: nvgpu: support free space query in allocators

Add gk20a_alloc_space() to query the amount of free memory in bytes in
gk20a_allocator.

Bug 1787771
Bug 200233138

Change-Id: Ia381cafd5d2dbf394072d07be96991974f9289ae
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1223760
(cherry picked from commit 0c7fd96acc3e3d581bd25ccbe40b0821a310760f)
Reviewed-on: http://git-master/r/1235978
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
index f8e55788..15d5b732 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
@@ -59,6 +59,14 @@ u64 gk20a_alloc_end(struct gk20a_allocator *a)
         return 0;
 }
 
+u64 gk20a_alloc_space(struct gk20a_allocator *a)
+{
+        if (a->ops->space)
+                return a->ops->space(a);
+
+        return 0;
+}
+
 u64 gk20a_alloc(struct gk20a_allocator *a, u64 len)
 {
         return a->ops->alloc(a, len);