drm/i915: move i915_buddy slab to direct module init/exit

With the global kmem_cache shrink infrastructure gone there's nothing
special and we can convert them over.

I'm doing this split up into each patch because there's quite a bit of
noise with removing the static global.slab_blocks to just a
slab_blocks.

v2: Make slab static (Jason, 0day)

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210727121037.2041102-3-daniel.vetter@ffwll.ch

drivers/gpu/drm/i915/i915_buddy.c

@@ -8,13 +8,9 @@
 #include "i915_buddy.h"
 
 #include "i915_gem.h"
-#include "i915_globals.h"
 #include "i915_utils.h"
 
-static struct i915_global_buddy {
-	struct i915_global base;
-	struct kmem_cache *slab_blocks;
-} global;
+static struct kmem_cache *slab_blocks;
 
 static struct i915_buddy_block *i915_block_alloc(struct i915_buddy_mm *mm,
 						 struct i915_buddy_block *parent,
@@ -25,7 +21,7 @@ static struct i915_buddy_block *i915_block_alloc(struct i915_buddy_mm *mm,
 
 	GEM_BUG_ON(order > I915_BUDDY_MAX_ORDER);
 
-	block = kmem_cache_zalloc(global.slab_blocks, GFP_KERNEL);
+	block = kmem_cache_zalloc(slab_blocks, GFP_KERNEL);
 	if (!block)
 		return NULL;
 
@@ -40,7 +36,7 @@ static struct i915_buddy_block *i915_block_alloc(struct i915_buddy_mm *mm,
 static void i915_block_free(struct i915_buddy_mm *mm,
 			    struct i915_buddy_block *block)
 {
-	kmem_cache_free(global.slab_blocks, block);
+	kmem_cache_free(slab_blocks, block);
 }
 
 static void mark_allocated(struct i915_buddy_block *block)
@@ -410,21 +406,16 @@ err_free:
 #include "selftests/i915_buddy.c"
 #endif
 
-static void i915_global_buddy_exit(void)
+void i915_buddy_module_exit(void)
 {
-	kmem_cache_destroy(global.slab_blocks);
+	kmem_cache_destroy(slab_blocks);
 }
 
-static struct i915_global_buddy global = { {
-	.exit = i915_global_buddy_exit,
-} };
-
-int __init i915_global_buddy_init(void)
+int __init i915_buddy_module_init(void)
 {
-	global.slab_blocks = KMEM_CACHE(i915_buddy_block, 0);
-	if (!global.slab_blocks)
+	slab_blocks = KMEM_CACHE(i915_buddy_block, 0);
+	if (!slab_blocks)
 		return -ENOMEM;
 
-	i915_global_register(&global.base);
 	return 0;
 }

drivers/gpu/drm/i915/i915_buddy.h

@@ -129,6 +129,7 @@ void i915_buddy_free(struct i915_buddy_mm *mm, struct i915_buddy_block *block);
 
 void i915_buddy_free_list(struct i915_buddy_mm *mm, struct list_head *objects);
 
-int i915_global_buddy_init(void);
+void i915_buddy_module_exit(void);
+int i915_buddy_module_init(void);
 
 #endif

drivers/gpu/drm/i915/i915_globals.c

@@ -7,7 +7,6 @@
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 
-#include "i915_buddy.h"
 #include "gem/i915_gem_context.h"
 #include "gem/i915_gem_object.h"
 #include "i915_globals.h"
@@ -33,7 +32,6 @@ static void __i915_globals_cleanup(void)
 }
 
 static __initconst int (* const initfn[])(void) = {
-	i915_global_buddy_init,
 	i915_global_context_init,
 	i915_global_gem_context_init,
 	i915_global_objects_init,

drivers/gpu/drm/i915/i915_pci.c

@@ -31,6 +31,7 @@
 #include "display/intel_fbdev.h"
 
 #include "i915_active.h"
+#include "i915_buddy.h"
 #include "i915_drv.h"
 #include "i915_perf.h"
 #include "i915_globals.h"
@@ -1261,6 +1262,7 @@ static const struct {
 } init_funcs[] = {
 	{ i915_check_nomodeset, NULL },
 	{ i915_active_module_init, i915_active_module_exit },
+	{ i915_buddy_module_init, i915_buddy_module_exit },
 	{ i915_globals_init, i915_globals_exit },
 	{ i915_mock_selftests, NULL },
 	{ i915_pmu_init, i915_pmu_exit },