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#ifndef _INTEL_RINGBUFFER_H_

#define _INTEL_RINGBUFFER_H_

enum {

    RCS = 0x0,

    VCS,

    BCS,

    I915_NUM_RINGS,

};

struct  intel_hw_status_page {

	u32	__iomem	*page_addr;

	unsigned int	gfx_addr;

	struct		drm_i915_gem_object *obj;

};

#define I915_READ_TAIL(ring) I915_READ(RING_TAIL((ring)->mmio_base))

#define I915_WRITE_TAIL(ring, val) I915_WRITE(RING_TAIL((ring)->mmio_base), val)

#define I915_READ_START(ring) I915_READ(RING_START((ring)->mmio_base))

#define I915_WRITE_START(ring, val) I915_WRITE(RING_START((ring)->mmio_base), val)

#define I915_READ_HEAD(ring)  I915_READ(RING_HEAD((ring)->mmio_base))

#define I915_WRITE_HEAD(ring, val) I915_WRITE(RING_HEAD((ring)->mmio_base), val)

#define I915_READ_CTL(ring) I915_READ(RING_CTL((ring)->mmio_base))

#define I915_WRITE_CTL(ring, val) I915_WRITE(RING_CTL((ring)->mmio_base), val)

#define I915_READ_IMR(ring) I915_READ(RING_IMR((ring)->mmio_base))

#define I915_WRITE_IMR(ring, val) I915_WRITE(RING_IMR((ring)->mmio_base), val)

#define I915_READ_NOPID(ring) I915_READ(RING_NOPID((ring)->mmio_base))

#define I915_READ_SYNC_0(ring) I915_READ(RING_SYNC_0((ring)->mmio_base))

#define I915_READ_SYNC_1(ring) I915_READ(RING_SYNC_1((ring)->mmio_base))

struct  intel_ring_buffer {

	const char	*name;

	enum intel_ring_id {

		RING_RENDER = 0x1,

		RING_BSD = 0x2,

		RING_BLT = 0x4,

	} id;

	u32		mmio_base;

	void		__iomem *virtual_start;

	struct		drm_device *dev;

	struct		drm_i915_gem_object *obj;

	u32		head;

	u32		tail;

	int		space;

	int		size;

	int		effective_size;

	struct intel_hw_status_page status_page;

	spinlock_t	irq_lock;

	u32		irq_refcount;

	u32		irq_mask;

	u32		irq_seqno;		/* last seq seem at irq time */

	u32		trace_irq_seqno;

	u32		waiting_seqno;

	u32		sync_seqno[I915_NUM_RINGS-1];

	bool __must_check (*irq_get)(struct intel_ring_buffer *ring);

	void		(*irq_put)(struct intel_ring_buffer *ring);

	int		(*init)(struct intel_ring_buffer *ring);

	void		(*write_tail)(struct intel_ring_buffer *ring,

				      u32 value);

	int __must_check (*flush)(struct intel_ring_buffer *ring,

				  u32	invalidate_domains,

				  u32	flush_domains);

	int		(*add_request)(struct intel_ring_buffer *ring,

				       u32 *seqno);

	u32		(*get_seqno)(struct intel_ring_buffer *ring);

	int		(*dispatch_execbuffer)(struct intel_ring_buffer *ring,

					       u32 offset, u32 length);

	void		(*cleanup)(struct intel_ring_buffer *ring);

	int		(*sync_to)(struct intel_ring_buffer *ring,

				   struct intel_ring_buffer *to,

				   u32 seqno);

	u32		semaphore_register[3]; /*our mbox written by others */

	u32		signal_mbox[2]; /* mboxes this ring signals to */

	/**

	 * List of objects currently involved in rendering from the

	 * ringbuffer.

	 *

	 * Includes buffers having the contents of their GPU caches

	 * flushed, not necessarily primitives.  last_rendering_seqno

	 * represents when the rendering involved will be completed.

	 *

	 * A reference is held on the buffer while on this list.

	 */

	struct list_head active_list;

	/**

	 * List of breadcrumbs associated with GPU requests currently

	 * outstanding.

	 */

	struct list_head request_list;

	/**

	 * List of objects currently pending a GPU write flush.

	 *

	 * All elements on this list will belong to either the

	 * active_list or flushing_list, last_rendering_seqno can

	 * be used to differentiate between the two elements.

	 */

	struct list_head gpu_write_list;

	/**

	 * Do we have some not yet emitted requests outstanding?

	 */

	u32 outstanding_lazy_request;

//   wait_queue_head_t irq_queue;

    drm_local_map_t map;

	void *private;

};

static inline u32

intel_ring_sync_index(struct intel_ring_buffer *ring,

		      struct intel_ring_buffer *other)

{

	int idx;

	/*

	 * cs -> 0 = vcs, 1 = bcs

	 * vcs -> 0 = bcs, 1 = cs,

	 * bcs -> 0 = cs, 1 = vcs.

	 */

	idx = (other - ring) - 1;

	if (idx < 0)

		idx += I915_NUM_RINGS;

	return idx;

}

static inline u32

intel_read_status_page(struct intel_ring_buffer *ring,

		       int reg)

{

	return ioread32(ring->status_page.page_addr + reg);

}

/**

 * Reads a dword out of the status page, which is written to from the command

 * queue by automatic updates, MI_REPORT_HEAD, MI_STORE_DATA_INDEX, or

 * MI_STORE_DATA_IMM.

 *

 * The following dwords have a reserved meaning:

 * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes.

 * 0x04: ring 0 head pointer

 * 0x05: ring 1 head pointer (915-class)

 * 0x06: ring 2 head pointer (915-class)

 * 0x10-0x1b: Context status DWords (GM45)

 * 0x1f: Last written status offset. (GM45)

 *

 * The area from dword 0x20 to 0x3ff is available for driver usage.

 */

#define READ_HWSP(dev_priv, reg) intel_read_status_page(LP_RING(dev_priv), reg)

#define READ_BREADCRUMB(dev_priv) READ_HWSP(dev_priv, I915_BREADCRUMB_INDEX)

#define I915_GEM_HWS_INDEX		0x20

#define I915_BREADCRUMB_INDEX		0x21

void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);

int __must_check intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n);

static inline int intel_wait_ring_idle(struct intel_ring_buffer *ring)

{

	return intel_wait_ring_buffer(ring, ring->size - 8);

}

int __must_check intel_ring_begin(struct intel_ring_buffer *ring, int n);

static inline void intel_ring_emit(struct intel_ring_buffer *ring,

				   u32 data)

{

	iowrite32(data, ring->virtual_start + ring->tail);

	ring->tail += 4;

}

void intel_ring_advance(struct intel_ring_buffer *ring);

u32 intel_ring_get_seqno(struct intel_ring_buffer *ring);

int intel_init_render_ring_buffer(struct drm_device *dev);

int intel_init_bsd_ring_buffer(struct drm_device *dev);

int intel_init_blt_ring_buffer(struct drm_device *dev);

u32 intel_ring_get_active_head(struct intel_ring_buffer *ring);

void intel_ring_setup_status_page(struct intel_ring_buffer *ring);

static inline void i915_trace_irq_get(struct intel_ring_buffer *ring, u32 seqno)

{

	if (ring->trace_irq_seqno == 0 && ring->irq_get(ring))

		ring->trace_irq_seqno = seqno;

}

/* DRI warts */

int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size);

#endif /* _INTEL_RINGBUFFER_H_ */