drivers/gpu/drm/i915/intel_ringbuffer.h - arm/linux-arm64-legacy - Git at Google

 #ifndef _INTEL_RINGBUFFER_H_
 #define _INTEL_RINGBUFFER_H_

 /*
  * Gen2 BSpec "1. Programming Environment" / 1.4.4.6 "Ring Buffer Use"
  * Gen3 BSpec "vol1c Memory Interface Functions" / 2.3.4.5 "Ring Buffer Use"
  * Gen4+ BSpec "vol1c Memory Interface and Command Stream" / 5.3.4.5 "Ring Buffer Use"
  *
  * "If the Ring Buffer Head Pointer and the Tail Pointer are on the same
  * cacheline, the Head Pointer must not be greater than the Tail
  * Pointer."
  */
 #define I915_RING_FREE_SPACE 64

 struct  intel_hw_status_page {
 	u32		*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))

 enum intel_ring_hangcheck_action { wait, active, kick, hung };

 struct intel_ring_hangcheck {
 	bool deadlock;
 	u32 seqno;
 	u32 acthd;
 	int score;
 	enum intel_ring_hangcheck_action action;
 };

 struct  intel_ring_buffer {
 	const char	*name;
 	enum intel_ring_id {
 		RCS = 0x0,
 		VCS,
 		BCS,
 		VECS,
 	} id;
 #define I915_NUM_RINGS 4
 	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;

 	/** We track the position of the requests in the ring buffer, and
 	 * when each is retired we increment last_retired_head as the GPU
 	 * must have finished processing the request and so we know we
 	 * can advance the ringbuffer up to that position.
 	 *
 	 * last_retired_head is set to -1 after the value is consumed so
 	 * we can detect new retirements.
 	 */
 	u32		last_retired_head;

 	struct {
 		u32	gt; /*  protected by dev_priv->irq_lock */
 		u32	pm; /*  protected by dev_priv->rps.lock (sucks) */
 	} irq_refcount;
 	u32		irq_enable_mask;	/* bitmask to enable ring interrupt */
 	u32		trace_irq_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);
 	/* Some chipsets are not quite as coherent as advertised and need
 	 * an expensive kick to force a true read of the up-to-date seqno.
 	 * However, the up-to-date seqno is not always required and the last
 	 * seen value is good enough. Note that the seqno will always be
 	 * monotonic, even if not coherent.
 	 */
 	u32		(*get_seqno)(struct intel_ring_buffer *ring,
 				     bool lazy_coherency);
 	void		(*set_seqno)(struct intel_ring_buffer *ring,
 				     u32 seqno);
 	int		(*dispatch_execbuffer)(struct intel_ring_buffer *ring,
 					       u32 offset, u32 length,
 					       unsigned flags);
 #define I915_DISPATCH_SECURE 0x1
 #define I915_DISPATCH_PINNED 0x2
 	void		(*cleanup)(struct intel_ring_buffer *ring);
 	int		(*sync_to)(struct intel_ring_buffer *ring,
 				   struct intel_ring_buffer *to,
 				   u32 seqno);

 	/* our mbox written by others */
 	u32		semaphore_register[I915_NUM_RINGS];
 	/* mboxes this ring signals to */
 	u32		signal_mbox[I915_NUM_RINGS];

 	/**
 	 * 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;

 	/**
 	 * Do we have some not yet emitted requests outstanding?
 	 */
 	u32 outstanding_lazy_request;
 	bool gpu_caches_dirty;
 	bool fbc_dirty;

 	wait_queue_head_t irq_queue;

 	/**
 	 * Do an explicit TLB flush before MI_SET_CONTEXT
 	 */
 	bool itlb_before_ctx_switch;
 	struct i915_hw_context *default_context;
 	struct i915_hw_context *last_context;

 	struct intel_ring_hangcheck hangcheck;

 	void *private;
 };

 static inline bool
 intel_ring_initialized(struct intel_ring_buffer *ring)
 {
 	return ring->obj != NULL;
 }

 static inline unsigned
 intel_ring_flag(struct intel_ring_buffer *ring)
 {
 	return 1 << ring->id;
 }

 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)
 {
 	/* Ensure that the compiler doesn't optimize away the load. */
 	barrier();
 	return ring->status_page.page_addr[reg];
 }

 static inline void
 intel_write_status_page(struct intel_ring_buffer *ring,
 			int reg, u32 value)
 {
 	ring->status_page.page_addr[reg] = value;
 }

 /**
  * 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 I915_GEM_HWS_INDEX		0x20
 #define I915_GEM_HWS_SCRATCH_INDEX	0x30
 #define I915_GEM_HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH_INDEX << MI_STORE_DWORD_INDEX_SHIFT)

 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);

 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);
 int __must_check intel_ring_idle(struct intel_ring_buffer *ring);
 void intel_ring_init_seqno(struct intel_ring_buffer *ring, u32 seqno);
 int intel_ring_flush_all_caches(struct intel_ring_buffer *ring);
 int intel_ring_invalidate_all_caches(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);
 int intel_init_vebox_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 u32 intel_ring_get_tail(struct intel_ring_buffer *ring)
 {
 	return ring->tail;
 }

 static inline u32 intel_ring_get_seqno(struct intel_ring_buffer *ring)
 {
 	BUG_ON(ring->outstanding_lazy_request == 0);
 	return ring->outstanding_lazy_request;
 }

 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_ */
	#ifndef _INTEL_RINGBUFFER_H_
	#define _INTEL_RINGBUFFER_H_

	/*
	* Gen2 BSpec "1. Programming Environment" / 1.4.4.6 "Ring Buffer Use"
	* Gen3 BSpec "vol1c Memory Interface Functions" / 2.3.4.5 "Ring Buffer Use"
	* Gen4+ BSpec "vol1c Memory Interface and Command Stream" / 5.3.4.5 "Ring Buffer Use"
	*
	* "If the Ring Buffer Head Pointer and the Tail Pointer are on the same
	* cacheline, the Head Pointer must not be greater than the Tail
	* Pointer."
	*/
	#define I915_RING_FREE_SPACE 64

	struct intel_hw_status_page {
	u32 *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))

	enum intel_ring_hangcheck_action { wait, active, kick, hung };

	struct intel_ring_hangcheck {
	bool deadlock;
	u32 seqno;
	u32 acthd;
	int score;
	enum intel_ring_hangcheck_action action;
	};

	struct intel_ring_buffer {
	const char *name;
	enum intel_ring_id {
	RCS = 0x0,
	VCS,
	BCS,
	VECS,
	} id;
	#define I915_NUM_RINGS 4
	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;

	/** We track the position of the requests in the ring buffer, and
	* when each is retired we increment last_retired_head as the GPU
	* must have finished processing the request and so we know we
	* can advance the ringbuffer up to that position.
	*
	* last_retired_head is set to -1 after the value is consumed so
	* we can detect new retirements.
	*/
	u32 last_retired_head;

	struct {
	u32 gt; /* protected by dev_priv->irq_lock */
	u32 pm; /* protected by dev_priv->rps.lock (sucks) */
	} irq_refcount;
	u32 irq_enable_mask; /* bitmask to enable ring interrupt */
	u32 trace_irq_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);
	/* Some chipsets are not quite as coherent as advertised and need
	* an expensive kick to force a true read of the up-to-date seqno.
	* However, the up-to-date seqno is not always required and the last
	* seen value is good enough. Note that the seqno will always be
	* monotonic, even if not coherent.
	*/
	u32 (get_seqno)(struct intel_ring_buffer ring,
	bool lazy_coherency);
	void (set_seqno)(struct intel_ring_buffer ring,
	u32 seqno);
	int (dispatch_execbuffer)(struct intel_ring_buffer ring,
	u32 offset, u32 length,
	unsigned flags);
	#define I915_DISPATCH_SECURE 0x1
	#define I915_DISPATCH_PINNED 0x2
	void (cleanup)(struct intel_ring_buffer ring);
	int (sync_to)(struct intel_ring_buffer ring,
	struct intel_ring_buffer *to,
	u32 seqno);

	/* our mbox written by others */
	u32 semaphore_register[I915_NUM_RINGS];
	/* mboxes this ring signals to */
	u32 signal_mbox[I915_NUM_RINGS];

	/**
	* 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;

	/**
	* Do we have some not yet emitted requests outstanding?
	*/
	u32 outstanding_lazy_request;
	bool gpu_caches_dirty;
	bool fbc_dirty;

	wait_queue_head_t irq_queue;

	/**
	* Do an explicit TLB flush before MI_SET_CONTEXT
	*/
	bool itlb_before_ctx_switch;
	struct i915_hw_context *default_context;
	struct i915_hw_context *last_context;

	struct intel_ring_hangcheck hangcheck;

	void *private;
	};

	static inline bool
	intel_ring_initialized(struct intel_ring_buffer *ring)
	{
	return ring->obj != NULL;
	}

	static inline unsigned
	intel_ring_flag(struct intel_ring_buffer *ring)
	{
	return 1 << ring->id;
	}

	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)
	{
	/* Ensure that the compiler doesn't optimize away the load. */
	barrier();
	return ring->status_page.page_addr[reg];
	}

	static inline void
	intel_write_status_page(struct intel_ring_buffer *ring,
	int reg, u32 value)
	{
	ring->status_page.page_addr[reg] = value;
	}

	/**
	* 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 I915_GEM_HWS_INDEX 0x20
	#define I915_GEM_HWS_SCRATCH_INDEX 0x30
	#define I915_GEM_HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH_INDEX << MI_STORE_DWORD_INDEX_SHIFT)

	void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);

	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);
	int __must_check intel_ring_idle(struct intel_ring_buffer *ring);
	void intel_ring_init_seqno(struct intel_ring_buffer *ring, u32 seqno);
	int intel_ring_flush_all_caches(struct intel_ring_buffer *ring);
	int intel_ring_invalidate_all_caches(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);
	int intel_init_vebox_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 u32 intel_ring_get_tail(struct intel_ring_buffer *ring)
	{
	return ring->tail;
	}

	static inline u32 intel_ring_get_seqno(struct intel_ring_buffer *ring)
	{
	BUG_ON(ring->outstanding_lazy_request == 0);
	return ring->outstanding_lazy_request;
	}

	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_ */