gpu: nvgpu: Add VIDMEM debugging

Add some VIDMEM debugging to help track the background free
thread and allocs/frees.

JIRA NVGPU-30
JIRA NVGPU-138

Change-Id: I88471b29d2a42c104666b111d0d3014110c9d56c
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1576330
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/log.h b/drivers/gpu/nvgpu/include/nvgpu/log.h
index 2afddacb..65f86198 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/log.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/log.h
@@ -78,6 +78,7 @@ enum nvgpu_log_categories {
         gpu_dbg_alloc      = BIT(21),   /* Allocator debugging. */
         gpu_dbg_dma        = BIT(22),   /* DMA allocation prints. */
         gpu_dbg_sgl        = BIT(23),   /* SGL related traces. */
+        gpu_dbg_vidmem     = BIT(24),   /* VIDMEM tracing. */
         gpu_dbg_mem        = BIT(31),   /* memory accesses; very verbose. */
 };
 
diff --git a/drivers/gpu/nvgpu/include/nvgpu/vidmem.h b/drivers/gpu/nvgpu/include/nvgpu/vidmem.h
index 690f8164..62c970d3 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/vidmem.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/vidmem.h
@@ -142,4 +142,10 @@ static inline void nvgpu_vidmem_thread_unpause(struct mm_gk20a *mm)
 
 #endif /* !defined(CONFIG_GK20A_VIDMEM) */
 
+/*
+ * Simple macro for VIDMEM debugging.
+ */
+#define vidmem_dbg(g, fmt, args...)                     \
+        nvgpu_log(g, gpu_dbg_vidmem, fmt, ##args);      \
+
 #endif /* __NVGPU_VIDMEM_H__ */