drm/hisilicon/hibmc: Add video memory management

Hibmc have 32m video memory which can be accessed through PCIe by host,
we use ttm to manage these memory.
Signed-off-by: Rongrong Zou <zourongrong@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Xinliang Liu <xinliang.liu@linaro.org>
Acked-by: Sean Paul <seanpaul@chromium.org>

drivers/gpu/drm/hisilicon/hibmc/Makefile

 ccflags-y := -Iinclude/drm
-hibmc-drm-y := hibmc_drm_drv.o
+hibmc-drm-y := hibmc_drm_drv.o hibmc_ttm.o
 
 obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -28,6 +28,7 @@ static const struct file_operations hibmc_fops = {
 	.release	= drm_release,
 	.unlocked_ioctl	= drm_ioctl,
 	.compat_ioctl	= drm_compat_ioctl,
+	.mmap		= hibmc_mmap,
 	.poll		= drm_poll,
 	.read		= drm_read,
 	.llseek		= no_llseek,
@@ -43,6 +44,7 @@ static void hibmc_disable_vblank(struct drm_device *dev, unsigned int pipe)
 }
 
 static struct drm_driver hibmc_driver = {
+	.driver_features	= DRIVER_GEM,
 	.fops			= &hibmc_fops,
 	.name			= "hibmc",
 	.date			= "20160828",
@@ -52,6 +54,10 @@ static struct drm_driver hibmc_driver = {
 	.get_vblank_counter	= drm_vblank_no_hw_counter,
 	.enable_vblank		= hibmc_enable_vblank,
 	.disable_vblank		= hibmc_disable_vblank,
+	.gem_free_object_unlocked = hibmc_gem_free_object,
+	.dumb_create            = hibmc_dumb_create,
+	.dumb_map_offset        = hibmc_dumb_mmap_offset,
+	.dumb_destroy           = drm_gem_dumb_destroy,
 };
 
 static int hibmc_pm_suspend(struct device *dev)
@@ -194,6 +200,10 @@ static int hibmc_hw_init(struct hibmc_drm_private *priv)
 
 static int hibmc_unload(struct drm_device *dev)
 {
+	struct hibmc_drm_private *priv = dev->dev_private;
+
+	hibmc_mm_fini(priv);
+	dev->dev_private = NULL;
 	return 0;
 }
 
@@ -214,6 +224,10 @@ static int hibmc_load(struct drm_device *dev)
 	if (ret)
 		goto err;
 
+	ret = hibmc_mm_init(priv);
+	if (ret)
+		goto err;
+
 	return 0;
 
 err:

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h

@@ -20,6 +20,8 @@
 #define HIBMC_DRM_DRV_H
 
 #include <drm/drmP.h>
+#include <drm/drm_gem.h>
+#include <drm/ttm/ttm_bo_driver.h>
 
 struct hibmc_drm_private {
 	/* hw */
@@ -31,11 +33,50 @@ struct hibmc_drm_private {
 	/* drm */
 	struct drm_device  *dev;
 
+	/* ttm */
+	struct drm_global_reference mem_global_ref;
+	struct ttm_bo_global_ref bo_global_ref;
+	struct ttm_bo_device bdev;
+	bool initialized;
+
+	bool mm_inited;
+};
+
+struct hibmc_bo {
+	struct ttm_buffer_object bo;
+	struct ttm_placement placement;
+	struct ttm_bo_kmap_obj kmap;
+	struct drm_gem_object gem;
+	struct ttm_place placements[3];
+	int pin_count;
 };
 
+static inline struct hibmc_bo *hibmc_bo(struct ttm_buffer_object *bo)
+{
+	return container_of(bo, struct hibmc_bo, bo);
+}
+
+static inline struct hibmc_bo *gem_to_hibmc_bo(struct drm_gem_object *gem)
+{
+	return container_of(gem, struct hibmc_bo, gem);
+}
+
 void hibmc_set_power_mode(struct hibmc_drm_private *priv,
 			  unsigned int power_mode);
 void hibmc_set_current_gate(struct hibmc_drm_private *priv,
 			    unsigned int gate);
 
+int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
+		     struct drm_gem_object **obj);
+int hibmc_mm_init(struct hibmc_drm_private *hibmc);
+void hibmc_mm_fini(struct hibmc_drm_private *hibmc);
+int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr);
+int hibmc_bo_unpin(struct hibmc_bo *bo);
+void hibmc_gem_free_object(struct drm_gem_object *obj);
+int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
+		      struct drm_mode_create_dumb *args);
+int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
+			   u32 handle, u64 *offset);
+int hibmc_mmap(struct file *filp, struct vm_area_struct *vma);
+
 #endif