[PATCH v2 15/17] drm/vboxvideo: Convert vboxvideo driver to VRAM MM

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The data structure |struct drm_vram_mm| and its helpers replace vboxvideo's
TTM-based memory manager. It's the same implementation; except for the type
names.

v2:
	* implement vbox_mmap() with drm_vram_mm_mmap()

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
 drivers/gpu/drm/vboxvideo/Kconfig     |   1 +
 drivers/gpu/drm/vboxvideo/vbox_drv.h  |  10 +-
 drivers/gpu/drm/vboxvideo/vbox_main.c |   4 +-
 drivers/gpu/drm/vboxvideo/vbox_ttm.c  | 126 ++------------------------
 4 files changed, 14 insertions(+), 127 deletions(-)

diff --git a/drivers/gpu/drm/vboxvideo/Kconfig b/drivers/gpu/drm/vboxvideo/Kconfig
index 96c794a39c56..485b665a9fa4 100644
--- a/drivers/gpu/drm/vboxvideo/Kconfig
+++ b/drivers/gpu/drm/vboxvideo/Kconfig
@@ -4,6 +4,7 @@ config DRM_VBOXVIDEO
 	select DRM_KMS_HELPER
 	select DRM_TTM
 	select DRM_GEM_VRAM_HELPER
+	select DRM_VRAM_MM_HELPER
 	select GENERIC_ALLOCATOR
 	help
 	  This is a KMS driver for the virtual Graphics Card used in
diff --git a/drivers/gpu/drm/vboxvideo/vbox_drv.h b/drivers/gpu/drm/vboxvideo/vbox_drv.h
index f91564440a8f..e5a160e6bcc7 100644
--- a/drivers/gpu/drm/vboxvideo/vbox_drv.h
+++ b/drivers/gpu/drm/vboxvideo/vbox_drv.h
@@ -20,11 +20,7 @@
 #include <drm/drm_gem.h>
 #include <drm/drm_gem_vram_helper.h>
 
-#include <drm/ttm/ttm_bo_api.h>
-#include <drm/ttm/ttm_bo_driver.h>
-#include <drm/ttm/ttm_placement.h>
-#include <drm/ttm/ttm_memory.h>
-#include <drm/ttm/ttm_module.h>
+#include <drm/drm_vram_mm_helper.h>
 
 #include "vboxvideo_guest.h"
 #include "vboxvideo_vbe.h"
@@ -78,9 +74,7 @@ struct vbox_private {
 
 	int fb_mtrr;
 
-	struct {
-		struct ttm_bo_device bdev;
-	} ttm;
+	struct drm_vram_mm vmm;
 
 	struct mutex hw_mutex; /* protects modeset and accel/vbva accesses */
 	struct work_struct hotplug_work;
diff --git a/drivers/gpu/drm/vboxvideo/vbox_main.c b/drivers/gpu/drm/vboxvideo/vbox_main.c
index 525e9fd63f4d..8726b33abe7f 100644
--- a/drivers/gpu/drm/vboxvideo/vbox_main.c
+++ b/drivers/gpu/drm/vboxvideo/vbox_main.c
@@ -283,7 +283,7 @@ int vbox_gem_create(struct vbox_private *vbox,
 	if (size == 0)
 		return -EINVAL;
 
-	gbo = drm_gem_vram_create(&vbox->ddev, &vbox->ttm.bdev, size, 0, false);
+	gbo = drm_gem_vram_create(&vbox->ddev, &vbox->vmm.bdev, size, 0, false);
 	if (IS_ERR(gbo)) {
 		ret = PTR_ERR(gbo);
 		if (ret != -ERESTARTSYS)
@@ -301,7 +301,7 @@ int vbox_dumb_create(struct drm_file *file,
 {
 	struct vbox_private *vbox = dev->dev_private;
 
-	return drm_gem_vram_fill_create_dumb(file, dev, &vbox->ttm.bdev, 0,
+	return drm_gem_vram_fill_create_dumb(file, dev, &vbox->vmm.bdev, 0,
 					    false, args);
 
 }
diff --git a/drivers/gpu/drm/vboxvideo/vbox_ttm.c b/drivers/gpu/drm/vboxvideo/vbox_ttm.c
index 0989d656eed6..b71a3c404db1 100644
--- a/drivers/gpu/drm/vboxvideo/vbox_ttm.c
+++ b/drivers/gpu/drm/vboxvideo/vbox_ttm.c
@@ -8,131 +8,27 @@
  */
 #include <linux/pci.h>
 #include <drm/drm_file.h>
-#include <drm/ttm/ttm_page_alloc.h>
 #include "vbox_drv.h"
 
-static inline struct vbox_private *vbox_bdev(struct ttm_bo_device *bd)
-{
-	return container_of(bd, struct vbox_private, ttm.bdev);
-}
-
-static int
-vbox_bo_init_mem_type(struct ttm_bo_device *bdev, u32 type,
-		      struct ttm_mem_type_manager *man)
-{
-	switch (type) {
-	case TTM_PL_SYSTEM:
-		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
-		man->available_caching = TTM_PL_MASK_CACHING;
-		man->default_caching = TTM_PL_FLAG_CACHED;
-		break;
-	case TTM_PL_VRAM:
-		man->func = &ttm_bo_manager_func;
-		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
-		man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
-		man->default_caching = TTM_PL_FLAG_WC;
-		break;
-	default:
-		DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int vbox_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
-				   struct ttm_mem_reg *mem)
-{
-	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
-	struct vbox_private *vbox = vbox_bdev(bdev);
-
-	mem->bus.addr = NULL;
-	mem->bus.offset = 0;
-	mem->bus.size = mem->num_pages << PAGE_SHIFT;
-	mem->bus.base = 0;
-	mem->bus.is_iomem = false;
-	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
-		return -EINVAL;
-	switch (mem->mem_type) {
-	case TTM_PL_SYSTEM:
-		/* system memory */
-		return 0;
-	case TTM_PL_VRAM:
-		mem->bus.offset = mem->start << PAGE_SHIFT;
-		mem->bus.base = pci_resource_start(vbox->ddev.pdev, 0);
-		mem->bus.is_iomem = true;
-		break;
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static void vbox_ttm_io_mem_free(struct ttm_bo_device *bdev,
-				 struct ttm_mem_reg *mem)
-{
-}
-
-static void vbox_ttm_backend_destroy(struct ttm_tt *tt)
-{
-	ttm_tt_fini(tt);
-	kfree(tt);
-}
-
-static struct ttm_backend_func vbox_tt_backend_func = {
-	.destroy = &vbox_ttm_backend_destroy,
-};
-
-static struct ttm_tt *vbox_ttm_tt_create(struct ttm_buffer_object *bo,
-					 u32 page_flags)
-{
-	struct ttm_tt *tt;
-
-	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
-	if (!tt)
-		return NULL;
-
-	tt->func = &vbox_tt_backend_func;
-	if (ttm_tt_init(tt, bo, page_flags)) {
-		kfree(tt);
-		return NULL;
-	}
-
-	return tt;
-}
-
-static struct ttm_bo_driver vbox_bo_driver = {
-	.ttm_tt_create = vbox_ttm_tt_create,
-	.init_mem_type = vbox_bo_init_mem_type,
-	.eviction_valuable = ttm_bo_eviction_valuable,
+static const struct drm_vram_mm_funcs vbox_vram_mm_funcs = {
 	.evict_flags = drm_gem_vram_bo_driver_evict_flags,
-	.verify_access = drm_gem_vram_bo_driver_verify_access,
-	.io_mem_reserve = &vbox_ttm_io_mem_reserve,
-	.io_mem_free = &vbox_ttm_io_mem_free,
+	.verify_access = drm_gem_vram_bo_driver_verify_access
 };
 
 int vbox_mm_init(struct vbox_private *vbox)
 {
 	int ret;
 	struct drm_device *dev = &vbox->ddev;
-	struct ttm_bo_device *bdev = &vbox->ttm.bdev;
 
-	ret = ttm_bo_device_init(&vbox->ttm.bdev,
-				 &vbox_bo_driver,
-				 dev->anon_inode->i_mapping,
-				 true);
+	ret = drm_vram_mm_init(&vbox->vmm, dev,
+			       pci_resource_start(dev->pdev, 0),
+			       vbox->available_vram_size,
+			       &vbox_vram_mm_funcs);
 	if (ret) {
-		DRM_ERROR("Error initialising bo driver; %d\n", ret);
+		DRM_ERROR("Error initializing VRAM MM; %d\n", ret);
 		return ret;
 	}
 
-	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
-			     vbox->available_vram_size >> PAGE_SHIFT);
-	if (ret) {
-		DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
-		goto err_device_release;
-	}
-
 #ifdef DRM_MTRR_WC
 	vbox->fb_mtrr = drm_mtrr_add(pci_resource_start(dev->pdev, 0),
 				     pci_resource_len(dev->pdev, 0),
@@ -142,10 +38,6 @@ int vbox_mm_init(struct vbox_private *vbox)
 					 pci_resource_len(dev->pdev, 0));
 #endif
 	return 0;
-
-err_device_release:
-	ttm_bo_device_release(&vbox->ttm.bdev);
-	return ret;
 }
 
 void vbox_mm_fini(struct vbox_private *vbox)
@@ -157,7 +49,7 @@ void vbox_mm_fini(struct vbox_private *vbox)
 #else
 	arch_phys_wc_del(vbox->fb_mtrr);
 #endif
-	ttm_bo_device_release(&vbox->ttm.bdev);
+	drm_vram_mm_cleanup(&vbox->vmm);
 }
 
 int vbox_mmap(struct file *filp, struct vm_area_struct *vma)
@@ -165,5 +57,5 @@ int vbox_mmap(struct file *filp, struct vm_area_struct *vma)
 	struct drm_file *file_priv = filp->private_data;
 	struct vbox_private *vbox = file_priv->minor->dev->dev_private;
 
-	return ttm_bo_mmap(filp, vma, &vbox->ttm.bdev);
+	return drm_vram_mm_mmap(filp, vma, &vbox->vmm);
 }
-- 
2.21.0

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