gpu: nvgpu: add @file syntax in mm header files

Add @file syntax in the following mm header files,
1) page_allocator.h
2) kmem.h
3) gmmu.h
4) pd_cache.h
5) pd_cache_priv.h

JIRA NVGPU-4105

Change-Id: Ifa8b9ef5f0d11608a5d6f165ba64566a32596972
Signed-off-by: Lakshmanan M <lm@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2223012
Reviewed-by: Rajesh Devaraj <rdevaraj@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/mm/gmmu/pd_cache_priv.h

@@ -23,18 +23,11 @@
 #ifndef NVGPU_GMMU_PD_CACHE_PRIV_H
 #define NVGPU_GMMU_PD_CACHE_PRIV_H
 
-#include <nvgpu/bug.h>
-#include <nvgpu/log.h>
-#include <nvgpu/gmmu.h>
-#include <nvgpu/nvgpu_mem.h>
-#include <nvgpu/list.h>
-#include <nvgpu/rbtree.h>
-#include <nvgpu/lock.h>
-
-#define pd_dbg(g, fmt, args...) nvgpu_log(g, gpu_dbg_pd_cache, fmt, ##args)
-
 /**
- * DOC: PD cache
+ * @file
+ *
+ * Page directory cache private interface
+ * --------------------------------------
  *
  * To save memory when using sub-page sized PD levels in Pascal and beyond a way
  * of packing PD tables together is necessary. If a PD table only requires 1024
@@ -73,6 +66,16 @@
  * allocated by nvgpu_pd_alloc().
  */
 
+#include <nvgpu/bug.h>
+#include <nvgpu/log.h>
+#include <nvgpu/gmmu.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/list.h>
+#include <nvgpu/rbtree.h>
+#include <nvgpu/lock.h>
+
+#define pd_dbg(g, fmt, args...) nvgpu_log(g, gpu_dbg_pd_cache, fmt, ##args)
+
 /**
  * Minimum size of a cache. The number of different caches in the nvgpu_pd_cache
  * structure is of course depending on this.

drivers/gpu/nvgpu/include/nvgpu/gmmu.h

@@ -23,6 +23,12 @@
 #ifndef NVGPU_GMMU_H
 #define NVGPU_GMMU_H
 
+/**
+ * @file
+ *
+ * GMMU interface.
+ */
+
 #include <nvgpu/types.h>
 #include <nvgpu/nvgpu_mem.h>
 #include <nvgpu/list.h>

drivers/gpu/nvgpu/include/nvgpu/kmem.h

@@ -26,7 +26,17 @@
 /**
  * @file
  *
- * Abstract interface for interacting with general Process memory.
+ * Kmem cache support
+ * ------------------
+ *
+ * In Linux there is support for the notion of a kmem_cache. It gives better
+ * memory usage characteristics for lots of allocations of the same size. Think
+ * structs that get allocated over and over. Normal kmalloc() type routines
+ * typically round to the next power-of-2 since that's easy.
+ *
+ * But if we know the size ahead of time the packing for the allocations can be
+ * much better. This is the benefit of a slab allocator. This type hides the
+ * underlying kmem_cache (or absense thereof).
  */
 
 #include <nvgpu/types.h>
@@ -44,21 +54,6 @@ struct gk20a;
 #include <nvgpu/posix/kmem.h>
 #endif
 
-/**
- * @file
- *
- * Kmem cache support
- * ------------------
- *
- * In Linux there is support for the notion of a kmem_cache. It gives better
- * memory usage characteristics for lots of allocations of the same size. Think
- * structs that get allocated over and over. Normal kmalloc() type routines
- * typically round to the next power-of-2 since that's easy.
- *
- * But if we know the size ahead of time the packing for the allocations can be
- * much better. This is the benefit of a slab allocator. This type hides the
- * underlying kmem_cache (or absense thereof).
- */
 struct nvgpu_kmem_cache;
 
 #ifdef CONFIG_NVGPU_TRACK_MEM_USAGE

drivers/gpu/nvgpu/include/nvgpu/page_allocator.h

@@ -23,18 +23,12 @@
 #ifndef PAGE_ALLOCATOR_PRIV_H
 #define PAGE_ALLOCATOR_PRIV_H
 
-#ifdef CONFIG_NVGPU_DGPU
-
-#include <nvgpu/allocator.h>
-#include <nvgpu/nvgpu_mem.h>
-#include <nvgpu/nvgpu_sgt.h>
-#include <nvgpu/kmem.h>
-#include <nvgpu/list.h>
-#include <nvgpu/rbtree.h>
-
-struct nvgpu_allocator;
-
 /**
+ * @file
+ *
+ * Page allocator interface
+ * ------------------------
+ *
  * This allocator implements the ability to do SLAB style allocation since the
  * GPU has two page sizes available - 4k and 64k/128k. When the default
  * granularity is the large page size (64k/128k) small allocations become very
@@ -54,6 +48,17 @@ struct nvgpu_allocator;
  * assumed to be 64k) the allocation is satisfied by one of the buckets.
  */
 
+#ifdef CONFIG_NVGPU_DGPU
+
+#include <nvgpu/allocator.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/nvgpu_sgt.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/list.h>
+#include <nvgpu/rbtree.h>
+
+struct nvgpu_allocator;
+
 /**
  * Structure to identify slab allocations.
  */

drivers/gpu/nvgpu/include/nvgpu/pd_cache.h

@@ -23,6 +23,13 @@
 #ifndef NVGPU_PD_CACHE_H
 #define NVGPU_PD_CACHE_H
 
+/**
+ * @file
+ *
+ * Page directory cache interface.
+ */
+
+
 #include <nvgpu/types.h>
 
 struct gk20a;