gpu: nvgpu: cleanup allocator debugging

Remove debugging features that did not really get used and make
the debugging code use the nvgpu_log() functionality. This ties
the allocator debugging into the larger nvgpu debug framework.

Also modify many of the places CONFIG_DEBUG_FS was used to
conditionally compile allocator debug code to use __KERNEL__
instead. This is because that debug code can still be called even
when debugfs is not present in Linux.

Change-Id: I112ebe1cae22d6f8db96d023993498093e18d74a
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1544439
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/linux/debug_allocator.c

@@ -20,12 +20,6 @@
 
 #include <nvgpu/allocator.h>
 
-void nvgpu_alloc_print_stats(struct nvgpu_allocator *__a,
-			     struct seq_file *s, int lock)
-{
-	__a->ops->print_stats(__a, s, lock);
-}
-
 static int __alloc_show(struct seq_file *s, void *unused)
 {
 	struct nvgpu_allocator *a = s->private;

drivers/gpu/nvgpu/common/mm/bitmap_allocator.c

@@ -311,7 +311,7 @@ static void nvgpu_bitmap_alloc_destroy(struct nvgpu_allocator *__a)
 	nvgpu_kfree(nvgpu_alloc_to_gpu(__a), a);
 }
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 static void nvgpu_bitmap_print_stats(struct nvgpu_allocator *__a,
 				     struct seq_file *s, int lock)
 {
@@ -347,7 +347,7 @@ static const struct nvgpu_allocator_ops bitmap_ops = {
 
 	.fini		= nvgpu_bitmap_alloc_destroy,
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 	.print_stats	= nvgpu_bitmap_print_stats,
 #endif
 };

drivers/gpu/nvgpu/common/mm/buddy_allocator.c

@@ -1076,7 +1076,7 @@ static u64 nvgpu_buddy_alloc_space(struct nvgpu_allocator *a)
 	return space;
 }
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 /*
  * 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
@@ -1174,7 +1174,7 @@ static const struct nvgpu_allocator_ops buddy_ops = {
 
 	.fini		= nvgpu_buddy_allocator_destroy,
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 	.print_stats	= nvgpu_buddy_print_stats,
 #endif
 };

drivers/gpu/nvgpu/common/mm/lockless_allocator.c

@@ -116,7 +116,7 @@ static void nvgpu_lockless_alloc_destroy(struct nvgpu_allocator *a)
 	nvgpu_kfree(nvgpu_alloc_to_gpu(a), pa);
 }
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 static void nvgpu_lockless_print_stats(struct nvgpu_allocator *a,
 				   struct seq_file *s, int lock)
 {
@@ -146,7 +146,7 @@ static const struct nvgpu_allocator_ops pool_ops = {
 
 	.fini		= nvgpu_lockless_alloc_destroy,
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 	.print_stats	= nvgpu_lockless_print_stats,
 #endif
 };

drivers/gpu/nvgpu/common/mm/nvgpu_allocator.c

@@ -114,6 +114,14 @@ void nvgpu_alloc_destroy(struct nvgpu_allocator *a)
 	memset(a, 0, sizeof(*a));
 }
 
+#ifdef __KERNEL__
+void nvgpu_alloc_print_stats(struct nvgpu_allocator *__a,
+			     struct seq_file *s, int lock)
+{
+	__a->ops->print_stats(__a, s, lock);
+}
+#endif
+
 /*
  * Handle the common init stuff for a nvgpu_allocator.
  */

drivers/gpu/nvgpu/common/mm/page_allocator.c

@@ -756,7 +756,7 @@ static void nvgpu_page_allocator_destroy(struct nvgpu_allocator *__a)
 	alloc_unlock(__a);
 }
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 static void nvgpu_page_print_stats(struct nvgpu_allocator *__a,
 				   struct seq_file *s, int lock)
 {
@@ -833,7 +833,7 @@ static const struct nvgpu_allocator_ops page_ops = {
 
 	.fini		= nvgpu_page_allocator_destroy,
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 	.print_stats	= nvgpu_page_print_stats,
 #endif
 };

drivers/gpu/nvgpu/include/nvgpu/allocator.h

@@ -17,8 +17,16 @@
 #ifndef __NVGPU_ALLOCATOR_H__
 #define __NVGPU_ALLOCATOR_H__
 
+#ifdef __KERNEL__
+/*
+ * The Linux kernel has this notion of seq_files for printing info to userspace.
+ * One of the allocator function pointers takes advantage of this and allows the
+ * debug output to be directed either to nvgpu_log() or a seq_file.
+ */
 #include <linux/seq_file.h>
+#endif
 
+#include <nvgpu/log.h>
 #include <nvgpu/lock.h>
 #include <nvgpu/list.h>
 
@@ -72,7 +80,7 @@ struct nvgpu_allocator_ops {
 	/* Destructor. */
 	void (*fini)(struct nvgpu_allocator *allocator);
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 	/* Debugging. */
 	void (*print_stats)(struct nvgpu_allocator *allocator,
 			    struct seq_file *s, int lock);
@@ -246,7 +254,7 @@ u64  nvgpu_alloc_space(struct nvgpu_allocator *a);
 
 void nvgpu_alloc_destroy(struct nvgpu_allocator *allocator);
 
-#ifdef CONFIG_DEBUG_FS
+#ifdef __KERNEL__
 void nvgpu_alloc_print_stats(struct nvgpu_allocator *a,
 			     struct seq_file *s, int lock);
 #endif
@@ -281,35 +289,36 @@ static inline void nvgpu_alloc_disable_dbg(struct nvgpu_allocator *a)
 /*
  * Debug stuff.
  */
+#ifdef __KERNEL__
 #define __alloc_pstat(seq, allocator, fmt, arg...)		\
 	do {							\
-		if (s)						\
+		if (seq)					\
 			seq_printf(seq, fmt, ##arg);		\
 		else						\
 			alloc_dbg(allocator, fmt, ##arg);	\
 	} while (0)
+#endif
 
 #define __alloc_dbg(a, fmt, arg...)				\
-	pr_info("%-25s %25s() " fmt, (a)->name, __func__, ##arg)
+	nvgpu_log((a)->g, gpu_dbg_alloc, "%25s " fmt, (a)->name, ##arg)
 
+/*
+ * This gives finer control over debugging messages. By defining the
+ * ALLOCATOR_DEBUG macro prints for an allocator will only get made if
+ * that allocator's debug flag is set.
+ *
+ * Otherwise debugging is as normal: debug statements for all allocators
+ * if the GPU debugging mask bit is set. Note: even when ALLOCATOR_DEBUG
+ * is set gpu_dbg_alloc must still also be set to true.
+ */
 #if defined(ALLOCATOR_DEBUG)
-/*
- * Always print the debug messages...
- */
-#define alloc_dbg(a, fmt, arg...) __alloc_dbg(a, fmt, ##arg)
-#else
-/*
- * Only print debug messages if debug is enabled for a given allocator.
- */
 #define alloc_dbg(a, fmt, arg...)				\
 	do {							\
 		if ((a)->debug)					\
 			__alloc_dbg((a), fmt, ##arg);		\
 	} while (0)
-
+#else
+#define alloc_dbg(a, fmt, arg...) __alloc_dbg(a, fmt, ##arg)
 #endif
-#define balloc_pr(alloctor, format, arg...)		\
-	pr_info("%-25s %25s() " format,			\
-		alloctor->name, __func__, ##arg)
 
 #endif /* NVGPU_ALLOCATOR_H */

drivers/gpu/nvgpu/include/nvgpu/log.h

@@ -69,6 +69,7 @@ enum nvgpu_log_categories {
 	gpu_dbg_shutdown   = BIT(18),	/* GPU shutdown tracing. */
 	gpu_dbg_kmem       = BIT(19),	/* Kmem tracking debugging. */
 	gpu_dbg_pd_cache   = BIT(20),	/* PD cache traces. */
+	gpu_dbg_alloc      = BIT(21),	/* Allocator debugging. */
 	gpu_dbg_mem        = BIT(31),	/* memory accesses; very verbose. */
 };