/* SPDX-License-Identifier: MIT */
/*
 * Copyright (C) 2013-2017 Oracle Corporation
 * This file is based on ast_drv.h
 * Copyright 2012 Red Hat Inc.
 * Authors: Dave Airlie <airlied@redhat.com>
 *          Michael Thayer <michael.thayer@oracle.com,
 *          Hans de Goede <hdegoede@redhat.com>
 */
#ifndef __VBOX_DRV_H__
#define __VBOX_DRV_H__

#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/irqreturn.h>
#include <linux/string.h>
#include <linux/version.h>

#include <drm/drm_encoder.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem.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 "vboxvideo_guest.h"
#include "vboxvideo_vbe.h"
#include "hgsmi_ch_setup.h"

#define DRIVER_NAME         "vboxvideo"
#define DRIVER_DESC         "Oracle VM VirtualBox Graphics Card"
#define DRIVER_DATE         "20130823"

#define DRIVER_MAJOR        1
#define DRIVER_MINOR        0
#define DRIVER_PATCHLEVEL   0

#define VBOX_MAX_CURSOR_WIDTH  64
#define VBOX_MAX_CURSOR_HEIGHT 64
#define CURSOR_PIXEL_COUNT (VBOX_MAX_CURSOR_WIDTH * VBOX_MAX_CURSOR_HEIGHT)
#define CURSOR_DATA_SIZE (CURSOR_PIXEL_COUNT * 4 + CURSOR_PIXEL_COUNT / 8)

#define VBOX_MAX_SCREENS  32

#define GUEST_HEAP_OFFSET(vbox) ((vbox)->full_vram_size - \
				 VBVA_ADAPTER_INFORMATION_SIZE)
#define GUEST_HEAP_SIZE   VBVA_ADAPTER_INFORMATION_SIZE
#define GUEST_HEAP_USABLE_SIZE (VBVA_ADAPTER_INFORMATION_SIZE - \
				sizeof(struct hgsmi_host_flags))
#define HOST_FLAGS_OFFSET GUEST_HEAP_USABLE_SIZE

struct vbox_framebuffer {
	struct drm_framebuffer base;
	struct drm_gem_object *obj;
};

struct vbox_private {
	/* Must be first; or we must define our own release callback */
	struct drm_device ddev;
	struct drm_fb_helper fb_helper;
	struct vbox_framebuffer afb;

	u8 __iomem *guest_heap;
	u8 __iomem *vbva_buffers;
	struct gen_pool *guest_pool;
	struct vbva_buf_ctx *vbva_info;
	bool any_pitch;
	u32 num_crtcs;
	/* Amount of available VRAM, including space used for buffers. */
	u32 full_vram_size;
	/* Amount of available VRAM, not including space used for buffers. */
	u32 available_vram_size;
	/* Array of structures for receiving mode hints. */
	struct vbva_modehint *last_mode_hints;

	int fb_mtrr;

	struct {
		struct ttm_bo_device bdev;
	} ttm;

	struct mutex hw_mutex; /* protects modeset and accel/vbva accesses */
	/*
	 * We decide whether or not user-space supports display hot-plug
	 * depending on whether they react to a hot-plug event after the initial
	 * mode query.
	 */
	bool initial_mode_queried;
	struct work_struct hotplug_work;
	u32 input_mapping_width;
	u32 input_mapping_height;
	/*
	 * Is user-space using an X.Org-style layout of one large frame-buffer
	 * encompassing all screen ones or is the fbdev console active?
	 */
	bool single_framebuffer;
	u8 cursor_data[CURSOR_DATA_SIZE];
};

#undef CURSOR_PIXEL_COUNT
#undef CURSOR_DATA_SIZE

struct vbox_gem_object;

struct vbox_connector {
	struct drm_connector base;
	char name[32];
	struct vbox_crtc *vbox_crtc;
	struct {
		u32 width;
		u32 height;
		bool disconnected;
	} mode_hint;
};

struct vbox_crtc {
	struct drm_crtc base;
	bool disconnected;
	unsigned int crtc_id;
	u32 fb_offset;
	bool cursor_enabled;
	u32 x_hint;
	u32 y_hint;
	/*
	 * When setting a mode we not only pass the mode to the hypervisor,
	 * but also information on how to map / translate input coordinates
	 * for the emulated USB tablet.  This input-mapping may change when
	 * the mode on *another* crtc changes.
	 *
	 * This means that sometimes we must do a modeset on other crtc-s then
	 * the one being changed to update the input-mapping. Including crtc-s
	 * which may be disabled inside the guest (shown as a black window
	 * on the host unless closed by the user).
	 *
	 * With atomic modesetting the mode-info of disabled crtcs gets zeroed
	 * yet we need it when updating the input-map to avoid resizing the
	 * window as a side effect of a mode_set on another crtc. Therefor we
	 * cache the info of the last mode below.
	 */
	u32 width;
	u32 height;
	u32 x;
	u32 y;
};

struct vbox_encoder {
	struct drm_encoder base;
};

#define to_vbox_crtc(x) container_of(x, struct vbox_crtc, base)
#define to_vbox_connector(x) container_of(x, struct vbox_connector, base)
#define to_vbox_encoder(x) container_of(x, struct vbox_encoder, base)
#define to_vbox_framebuffer(x) container_of(x, struct vbox_framebuffer, base)

bool vbox_check_supported(u16 id);
int vbox_hw_init(struct vbox_private *vbox);
void vbox_hw_fini(struct vbox_private *vbox);

int vbox_mode_init(struct vbox_private *vbox);
void vbox_mode_fini(struct vbox_private *vbox);

void vbox_report_caps(struct vbox_private *vbox);

void vbox_framebuffer_dirty_rectangles(struct drm_framebuffer *fb,
				       struct drm_clip_rect *rects,
				       unsigned int num_rects);

int vbox_framebuffer_init(struct vbox_private *vbox,
			  struct vbox_framebuffer *vbox_fb,
			  const struct drm_mode_fb_cmd2 *mode_cmd,
			  struct drm_gem_object *obj);

int vboxfb_create(struct drm_fb_helper *helper,
		  struct drm_fb_helper_surface_size *sizes);
void vbox_fbdev_fini(struct vbox_private *vbox);

struct vbox_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;
};

#define gem_to_vbox_bo(gobj) container_of((gobj), struct vbox_bo, gem)

static inline struct vbox_bo *vbox_bo(struct ttm_buffer_object *bo)
{
	return container_of(bo, struct vbox_bo, bo);
}

#define to_vbox_obj(x) container_of(x, struct vbox_gem_object, base)

static inline u64 vbox_bo_gpu_offset(struct vbox_bo *bo)
{
	return bo->bo.offset;
}

int vbox_dumb_create(struct drm_file *file,
		     struct drm_device *dev,
		     struct drm_mode_create_dumb *args);

void vbox_gem_free_object(struct drm_gem_object *obj);
int vbox_dumb_mmap_offset(struct drm_file *file,
			  struct drm_device *dev,
			  u32 handle, u64 *offset);

#define DRM_FILE_PAGE_OFFSET (0x10000000ULL >> PAGE_SHIFT)

int vbox_mm_init(struct vbox_private *vbox);
void vbox_mm_fini(struct vbox_private *vbox);

int vbox_bo_create(struct vbox_private *vbox, int size, int align,
		   u32 flags, struct vbox_bo **pvboxbo);

int vbox_gem_create(struct vbox_private *vbox,
		    u32 size, bool iskernel, struct drm_gem_object **obj);

int vbox_bo_pin(struct vbox_bo *bo, u32 pl_flag);
int vbox_bo_unpin(struct vbox_bo *bo);

static inline int vbox_bo_reserve(struct vbox_bo *bo, bool no_wait)
{
	int ret;

	ret = ttm_bo_reserve(&bo->bo, true, no_wait, NULL);
	if (ret) {
		if (ret != -ERESTARTSYS && ret != -EBUSY)
			DRM_ERROR("reserve failed %p\n", bo);
		return ret;
	}
	return 0;
}

static inline void vbox_bo_unreserve(struct vbox_bo *bo)
{
	ttm_bo_unreserve(&bo->bo);
}

void vbox_ttm_placement(struct vbox_bo *bo, int domain);
int vbox_bo_push_sysram(struct vbox_bo *bo);
int vbox_mmap(struct file *filp, struct vm_area_struct *vma);
void *vbox_bo_kmap(struct vbox_bo *bo);
void vbox_bo_kunmap(struct vbox_bo *bo);

/* vbox_prime.c */
int vbox_gem_prime_pin(struct drm_gem_object *obj);
void vbox_gem_prime_unpin(struct drm_gem_object *obj);
struct sg_table *vbox_gem_prime_get_sg_table(struct drm_gem_object *obj);
struct drm_gem_object *vbox_gem_prime_import_sg_table(
	struct drm_device *dev, struct dma_buf_attachment *attach,
	struct sg_table *table);
void *vbox_gem_prime_vmap(struct drm_gem_object *obj);
void vbox_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
int vbox_gem_prime_mmap(struct drm_gem_object *obj,
			struct vm_area_struct *area);

/* vbox_irq.c */
int vbox_irq_init(struct vbox_private *vbox);
void vbox_irq_fini(struct vbox_private *vbox);
void vbox_report_hotplug(struct vbox_private *vbox);
irqreturn_t vbox_irq_handler(int irq, void *arg);

/* vbox_hgsmi.c */
void *hgsmi_buffer_alloc(struct gen_pool *guest_pool, size_t size,
			 u8 channel, u16 channel_info);
void hgsmi_buffer_free(struct gen_pool *guest_pool, void *buf);
int hgsmi_buffer_submit(struct gen_pool *guest_pool, void *buf);

static inline void vbox_write_ioport(u16 index, u16 data)
{
	outw(index, VBE_DISPI_IOPORT_INDEX);
	outw(data, VBE_DISPI_IOPORT_DATA);
}

#endif