gpu: Move DRM buddy allocator one level up (part one)

Move the DRM buddy allocator one level up so that it can be used by GPU
drivers (example, nova-core) that have usecases other than DRM (such as
VFIO vGPU support). Modify the API, structures and Kconfigs to use
"gpu_buddy" terminology. Adapt the drivers and tests to use the new API.

The commit cannot be split due to bisectability, however no functional
change is intended. Verified by running K-UNIT tests and build tested
various configurations.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
[airlied: I've split this into two so git can find copies easier.
I've also just nuked drm_random library, that stuff needs to be done
elsewhere and only the buddy tests seem to be using it].
Signed-off-by: Dave Airlie <airlied@redhat.com>

Documentation/gpu/drm-mm.rst

@@ -526,10 +526,10 @@ DRM GPUVM Function References
 DRM Buddy Allocator
 ===================
 
-DRM Buddy Function References
------------------------------
+Buddy Allocator Function References (GPU buddy)
+-----------------------------------------------
 
-.. kernel-doc:: drivers/gpu/drm/drm_buddy.c
+.. kernel-doc:: drivers/gpu/buddy.c
    :export:
 
 DRM Cache Handling and Fast WC memcpy()

drivers/gpu/Makefile

@@ -2,7 +2,7 @@
 # drm/tegra depends on host1x, so if both drivers are built-in care must be
 # taken to initialize them in the correct order. Link order is the only way
 # to ensure this currently.
-obj-y			+= host1x/ drm/ vga/
+obj-y			+= host1x/ drm/ vga/ tests/
 obj-$(CONFIG_IMX_IPUV3_CORE)	+= ipu-v3/
 obj-$(CONFIG_TRACE_GPU_MEM)		+= trace/
 obj-$(CONFIG_NOVA_CORE)		+= nova-core/

drivers/gpu/buddy.c

@@ -10,7 +10,7 @@
 #include <linux/module.h>
 #include <linux/sizes.h>
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 #include <drm/drm_print.h>
 
 enum drm_buddy_free_tree {

drivers/gpu/drm/Kconfig

@@ -269,10 +269,6 @@ config DRM_SCHED
 config DRM_PANEL_BACKLIGHT_QUIRKS
 	tristate
 
-config DRM_LIB_RANDOM
-	bool
-	default n
-
 config DRM_PRIVACY_SCREEN
 	bool
 	default n

drivers/gpu/drm/Kconfig.debug

@@ -69,7 +69,6 @@ config DRM_KUNIT_TEST
 	select DRM_EXPORT_FOR_TESTS if m
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KUNIT_TEST_HELPERS
-	select DRM_LIB_RANDOM
 	select DRM_SYSFB_HELPER
 	select PRIME_NUMBERS
 	default KUNIT_ALL_TESTS

drivers/gpu/drm/Makefile

@@ -79,7 +79,6 @@ drm-$(CONFIG_DRM_CLIENT) += \
 	drm_client_event.o \
 	drm_client_modeset.o \
 	drm_client_sysrq.o
-drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 drm-$(CONFIG_DRM_PANEL) += drm_panel.o
 drm-$(CONFIG_OF) += drm_of.o
@@ -115,7 +114,7 @@ drm_gpusvm_helper-$(CONFIG_ZONE_DEVICE) += \
 
 obj-$(CONFIG_DRM_GPUSVM) += drm_gpusvm_helper.o
 
-obj-$(CONFIG_DRM_BUDDY) += drm_buddy.o
+obj-$(CONFIG_DRM_BUDDY) += ../buddy.o
 
 drm_dma_helper-y := drm_gem_dma_helper.o
 drm_dma_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fbdev_dma.o

drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.h

@@ -24,7 +24,7 @@
 #ifndef __AMDGPU_VRAM_MGR_H__
 #define __AMDGPU_VRAM_MGR_H__
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 
 struct amdgpu_vram_mgr {
 	struct ttm_resource_manager manager;

drivers/gpu/drm/i915/gem/i915_gem_ttm.c

@@ -5,7 +5,7 @@
 
 #include <linux/shmem_fs.h>
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 #include <drm/drm_print.h>
 #include <drm/ttm/ttm_placement.h>
 #include <drm/ttm/ttm_tt.h>

drivers/gpu/drm/i915/i915_scatterlist.c

@@ -7,7 +7,7 @@
 #include "i915_scatterlist.h"
 #include "i915_ttm_buddy_manager.h"
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 #include <drm/drm_mm.h>
 
 #include <linux/slab.h>

drivers/gpu/drm/i915/i915_ttm_buddy_manager.c

@@ -5,7 +5,7 @@
 
 #include <linux/slab.h>
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 #include <drm/drm_print.h>
 #include <drm/ttm/ttm_placement.h>
 #include <drm/ttm/ttm_bo.h>

drivers/gpu/drm/tests/Makefile

@@ -7,7 +7,6 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
 	drm_atomic_test.o \
 	drm_atomic_state_test.o \
 	drm_bridge_test.o \
-	drm_buddy_test.o \
 	drm_cmdline_parser_test.o \
 	drm_connector_test.o \
 	drm_damage_helper_test.o \

drivers/gpu/drm/tests/drm_exec_test.c

@@ -16,8 +16,6 @@
 #include <drm/drm_gem.h>
 #include <drm/drm_kunit_helpers.h>
 
-#include "../lib/drm_random.h"
-
 struct drm_exec_priv {
 	struct device *dev;
 	struct drm_device *drm;

drivers/gpu/drm/tests/drm_mm_test.c

@@ -16,8 +16,6 @@
 #include <drm/drm_mm.h>
 #include <drm/drm_print.h>
 
-#include "../lib/drm_random.h"
-
 enum {
 	BEST,
 	BOTTOMUP,

drivers/gpu/drm/ttm/tests/ttm_mock_manager.h

@@ -5,7 +5,7 @@
 #ifndef TTM_MOCK_MANAGER_H
 #define TTM_MOCK_MANAGER_H
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 
 struct ttm_mock_manager {
 	struct ttm_resource_manager man;

drivers/gpu/drm/xe/xe_ttm_vram_mgr_types.h

@@ -6,7 +6,7 @@
 #ifndef _XE_TTM_VRAM_MGR_TYPES_H_
 #define _XE_TTM_VRAM_MGR_TYPES_H_
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 #include <drm/ttm/ttm_device.h>
 
 /**

drivers/gpu/tests/Makefile

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+
+gpu_buddy_tests-y = gpu_buddy_test.o gpu_random.o
+obj-$(CONFIG_DRM_KUNIT_TEST) += gpu_buddy_tests.o

drivers/gpu/tests/gpu_buddy_test.c

@@ -10,9 +10,9 @@
 #include <linux/sched/signal.h>
 #include <linux/sizes.h>
 
-#include <drm/drm_buddy.h>
+#include <linux/gpu_buddy.h>
 
-#include "../lib/drm_random.h"
+#include "gpu_random.h"
 
 static unsigned int random_seed;
 

drivers/gpu/tests/gpu_random.c

@@ -6,7 +6,7 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 
-#include "drm_random.h"
+#include "gpu_random.h"
 
 u32 drm_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
 {