drm/msm: Count how many times iova memory is pinned

Add a reference count to track how many times a particular
chunk of iova memory is pinned (mapped) in the iomu and
add msm_gem_unpin_iova to give up references.

It is important to note that msm_gem_unpin_iova replaces
msm_gem_put_iova because the new implicit behavior
that an assigned iova in a given vma is now valid for the
life of the buffer and what we are really focusing on is
the use of that iova.

For now the unmappings are lazy; once the reference counts
go to zero they *COULD* be unmapped dynamically but that
will require an outside force such as a shrinker or
mm_notifiers.  For now, we're just focusing on getting
the counting right and setting ourselves up to be ready
for the future.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
index ec57ddeb8c77..df6308e7ea67 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
@@ -152,7 +152,7 @@ static int a6xx_crashdumper_run(struct msm_gpu *gpu,
 static void a6xx_crashdumper_free(struct msm_gpu *gpu,
 		struct a6xx_crashdumper *dumper)
 {
-	msm_gem_put_iova(dumper->bo, gpu->aspace);
+	msm_gem_unpin_iova(dumper->bo, gpu->aspace);
 	msm_gem_put_vaddr(dumper->bo);
 
 	drm_gem_object_unreference(dumper->bo);