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/*

 * Copyright © 2008-2010 Intel Corporation

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 *

 * Authors:

 *    Eric Anholt 

 *    Zou Nan hai 

 *    Xiang Hai hao

 *

 */

#define iowrite32(v, addr)      writel((v), (addr))

#define ioread32(addr)          readl(addr)

#include "drmP.h"

#include "drm.h"

#include "i915_drv.h"

#include "i915_drm.h"

#include "i915_trace.h"

#include "intel_drv.h"

/*

 * 965+ support PIPE_CONTROL commands, which provide finer grained control

 * over cache flushing.

 */

struct pipe_control {

	struct drm_i915_gem_object *obj;

	volatile u32 *cpu_page;

	u32 gtt_offset;

};

static inline int ring_space(struct intel_ring_buffer *ring)

{

	int space = (ring->head & HEAD_ADDR) - (ring->tail + 8);

	if (space < 0)

		space += ring->size;

	return space;

}

static u32 i915_gem_get_seqno(struct drm_device *dev)

{

	drm_i915_private_t *dev_priv = dev->dev_private;

	u32 seqno;

	seqno = dev_priv->next_seqno;

	/* reserve 0 for non-seqno */

	if (++dev_priv->next_seqno == 0)

		dev_priv->next_seqno = 1;

	return seqno;

}

static int

render_ring_flush(struct intel_ring_buffer *ring,

		  u32	invalidate_domains,

		  u32	flush_domains)

{

	struct drm_device *dev = ring->dev;

	u32 cmd;

	int ret;

	/*

	 * read/write caches:

	 *

	 * I915_GEM_DOMAIN_RENDER is always invalidated, but is

	 * only flushed if MI_NO_WRITE_FLUSH is unset.  On 965, it is

	 * also flushed at 2d versus 3d pipeline switches.

	 *

	 * read-only caches:

	 *

	 * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if

	 * MI_READ_FLUSH is set, and is always flushed on 965.

	 *

	 * I915_GEM_DOMAIN_COMMAND may not exist?

	 *

	 * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is

	 * invalidated when MI_EXE_FLUSH is set.

	 *

	 * I915_GEM_DOMAIN_VERTEX, which exists on 965, is

	 * invalidated with every MI_FLUSH.

	 *

	 * TLBs:

	 *

	 * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND

	 * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and

	 * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER

	 * are flushed at any MI_FLUSH.

	 */

	cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;

	if ((invalidate_domains|flush_domains) &

	    I915_GEM_DOMAIN_RENDER)

		cmd &= ~MI_NO_WRITE_FLUSH;

	if (INTEL_INFO(dev)->gen < 4) {

		/*

		 * On the 965, the sampler cache always gets flushed

		 * and this bit is reserved.

		 */

		if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER)

			cmd |= MI_READ_FLUSH;

	}

	if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION)

		cmd |= MI_EXE_FLUSH;

	if (invalidate_domains & I915_GEM_DOMAIN_COMMAND &&

	    (IS_G4X(dev) || IS_GEN5(dev)))

		cmd |= MI_INVALIDATE_ISP;

	ret = intel_ring_begin(ring, 2);

	if (ret)

		return ret;

	intel_ring_emit(ring, cmd);

	intel_ring_emit(ring, MI_NOOP);

	intel_ring_advance(ring);

	return 0;

}

/**

 * Emits a PIPE_CONTROL with a non-zero post-sync operation, for

 * implementing two workarounds on gen6.  From section 1.4.7.1

 * "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1:

 *

 * [DevSNB-C+{W/A}] Before any depth stall flush (including those

 * produced by non-pipelined state commands), software needs to first

 * send a PIPE_CONTROL with no bits set except Post-Sync Operation !=

 * 0.

 *

 * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable

 * =1, a PIPE_CONTROL with any non-zero post-sync-op is required.

 *

 * And the workaround for these two requires this workaround first:

 *

 * [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent

 * BEFORE the pipe-control with a post-sync op and no write-cache

 * flushes.

 *

 * And this last workaround is tricky because of the requirements on

 * that bit.  From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM

 * volume 2 part 1:

 *

 *     "1 of the following must also be set:

 *      - Render Target Cache Flush Enable ([12] of DW1)

 *      - Depth Cache Flush Enable ([0] of DW1)

 *      - Stall at Pixel Scoreboard ([1] of DW1)

 *      - Depth Stall ([13] of DW1)

 *      - Post-Sync Operation ([13] of DW1)

 *      - Notify Enable ([8] of DW1)"

 *

 * The cache flushes require the workaround flush that triggered this

 * one, so we can't use it.  Depth stall would trigger the same.

 * Post-sync nonzero is what triggered this second workaround, so we

 * can't use that one either.  Notify enable is IRQs, which aren't

 * really our business.  That leaves only stall at scoreboard.

 */

static int

intel_emit_post_sync_nonzero_flush(struct intel_ring_buffer *ring)

{

	struct pipe_control *pc = ring->private;

	u32 scratch_addr = pc->gtt_offset + 128;

	int ret;

	ret = intel_ring_begin(ring, 6);

	if (ret)

		return ret;

	intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));

	intel_ring_emit(ring, PIPE_CONTROL_CS_STALL |

			PIPE_CONTROL_STALL_AT_SCOREBOARD);

	intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */

	intel_ring_emit(ring, 0); /* low dword */

	intel_ring_emit(ring, 0); /* high dword */

	intel_ring_emit(ring, MI_NOOP);

	intel_ring_advance(ring);

	ret = intel_ring_begin(ring, 6);

	if (ret)

		return ret;

	intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));

	intel_ring_emit(ring, PIPE_CONTROL_QW_WRITE);

	intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */

	intel_ring_emit(ring, 0);

	intel_ring_emit(ring, 0);

	intel_ring_emit(ring, MI_NOOP);

	intel_ring_advance(ring);

	return 0;

}

static int

gen6_render_ring_flush(struct intel_ring_buffer *ring,

                         u32 invalidate_domains, u32 flush_domains)

{

	u32 flags = 0;

	struct pipe_control *pc = ring->private;

	u32 scratch_addr = pc->gtt_offset + 128;

	int ret;

	/* Force SNB workarounds for PIPE_CONTROL flushes */

	intel_emit_post_sync_nonzero_flush(ring);

	/* Just flush everything.  Experiments have shown that reducing the

	 * number of bits based on the write domains has little performance

	 * impact.

	 */

	flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;

	flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;

	flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;

	flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;

	flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;

	flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;

	flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;

	ret = intel_ring_begin(ring, 6);

	if (ret)

		return ret;

	intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));

	intel_ring_emit(ring, flags);

	intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT);

	intel_ring_emit(ring, 0); /* lower dword */

	intel_ring_emit(ring, 0); /* uppwer dword */

	intel_ring_emit(ring, MI_NOOP);

	intel_ring_advance(ring);

	return 0;

}

static void ring_write_tail(struct intel_ring_buffer *ring,

			    u32 value)

{

	drm_i915_private_t *dev_priv = ring->dev->dev_private;

	I915_WRITE_TAIL(ring, value);

}

u32 intel_ring_get_active_head(struct intel_ring_buffer *ring)

{

	drm_i915_private_t *dev_priv = ring->dev->dev_private;

	u32 acthd_reg = INTEL_INFO(ring->dev)->gen >= 4 ?

			RING_ACTHD(ring->mmio_base) : ACTHD;

	return I915_READ(acthd_reg);

}

static int init_ring_common(struct intel_ring_buffer *ring)

{

	drm_i915_private_t *dev_priv = ring->dev->dev_private;

	struct drm_i915_gem_object *obj = ring->obj;

	u32 head;

	/* Stop the ring if it's running. */

	I915_WRITE_CTL(ring, 0);

	I915_WRITE_HEAD(ring, 0);

	ring->write_tail(ring, 0);

	/* Initialize the ring. */

	I915_WRITE_START(ring, obj->gtt_offset);

	head = I915_READ_HEAD(ring) & HEAD_ADDR;

	/* G45 ring initialization fails to reset head to zero */

	if (head != 0) {

		DRM_DEBUG_KMS("%s head not reset to zero "

			      "ctl %08x head %08x tail %08x start %08x\n",

			      ring->name,

			      I915_READ_CTL(ring),

			      I915_READ_HEAD(ring),

			      I915_READ_TAIL(ring),

			      I915_READ_START(ring));

		I915_WRITE_HEAD(ring, 0);

		if (I915_READ_HEAD(ring) & HEAD_ADDR) {

			DRM_ERROR("failed to set %s head to zero "

				  "ctl %08x head %08x tail %08x start %08x\n",

				  ring->name,

				  I915_READ_CTL(ring),

				  I915_READ_HEAD(ring),

				  I915_READ_TAIL(ring),

				  I915_READ_START(ring));

		}

	}

	I915_WRITE_CTL(ring,

			((ring->size - PAGE_SIZE) & RING_NR_PAGES)

			| RING_REPORT_64K | RING_VALID);

	/* If the head is still not zero, the ring is dead */

	if ((I915_READ_CTL(ring) & RING_VALID) == 0 ||

	    I915_READ_START(ring) != obj->gtt_offset ||

	    (I915_READ_HEAD(ring) & HEAD_ADDR) != 0) {

		DRM_ERROR("%s initialization failed "

				"ctl %08x head %08x tail %08x start %08x\n",

				ring->name,

				I915_READ_CTL(ring),

				I915_READ_HEAD(ring),

				I915_READ_TAIL(ring),

				I915_READ_START(ring));

		return -EIO;

	}

    ring->head = I915_READ_HEAD(ring);

    ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;

    ring->space = ring_space(ring);

	return 0;

}

static int

init_pipe_control(struct intel_ring_buffer *ring)

{

	struct pipe_control *pc;

	struct drm_i915_gem_object *obj;

	int ret;

	if (ring->private)

		return 0;

	pc = kmalloc(sizeof(*pc), GFP_KERNEL);

	if (!pc)

		return -ENOMEM;

	obj = i915_gem_alloc_object(ring->dev, 4096);

	if (obj == NULL) {

		DRM_ERROR("Failed to allocate seqno page\n");

		ret = -ENOMEM;

		goto err;

	}

//   i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

	ret = i915_gem_object_pin(obj, 4096, true);

	if (ret)

		goto err_unref;

	pc->gtt_offset = obj->gtt_offset;

    pc->cpu_page =  (void*)MapIoMem(obj->pages[0], 4096, PG_SW);

	if (pc->cpu_page == NULL)

		goto err_unpin;

	pc->obj = obj;

	ring->private = pc;

	return 0;

err_unpin:

	i915_gem_object_unpin(obj);

err_unref:

	drm_gem_object_unreference(&obj->base);

err:

	kfree(pc);

	return ret;

}

static void

cleanup_pipe_control(struct intel_ring_buffer *ring)

{

	struct pipe_control *pc = ring->private;

	struct drm_i915_gem_object *obj;

	if (!ring->private)

		return;

	obj = pc->obj;

//	kunmap(obj->pages[0]);

	i915_gem_object_unpin(obj);

	drm_gem_object_unreference(&obj->base);

	kfree(pc);

	ring->private = NULL;

}

static int init_render_ring(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	int ret = init_ring_common(ring);

	if (INTEL_INFO(dev)->gen > 3) {

		int mode = VS_TIMER_DISPATCH << 16 | VS_TIMER_DISPATCH;

		if (IS_GEN6(dev) || IS_GEN7(dev))

			mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;

		I915_WRITE(MI_MODE, mode);

		if (IS_GEN7(dev))

			I915_WRITE(GFX_MODE_GEN7,

				   GFX_MODE_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) |

				   GFX_MODE_ENABLE(GFX_REPLAY_MODE));

	}

	if (INTEL_INFO(dev)->gen >= 5) {

		ret = init_pipe_control(ring);

		if (ret)

			return ret;

	}

	if (INTEL_INFO(dev)->gen >= 6) {

		I915_WRITE(INSTPM,

			   INSTPM_FORCE_ORDERING << 16 | INSTPM_FORCE_ORDERING);

	}

	return ret;

}

static void render_ring_cleanup(struct intel_ring_buffer *ring)

{

	if (!ring->private)

		return;

	cleanup_pipe_control(ring);

}

static void

update_mboxes(struct intel_ring_buffer *ring,

	    u32 seqno,

	    u32 mmio_offset)

{

	intel_ring_emit(ring, MI_SEMAPHORE_MBOX |

			      MI_SEMAPHORE_GLOBAL_GTT |

			MI_SEMAPHORE_REGISTER |

			MI_SEMAPHORE_UPDATE);

	intel_ring_emit(ring, seqno);

	intel_ring_emit(ring, mmio_offset);

}

/**

 * gen6_add_request - Update the semaphore mailbox registers

 *

 * @ring - ring that is adding a request

 * @seqno - return seqno stuck into the ring

 *

 * Update the mailbox registers in the *other* rings with the current seqno.

 * This acts like a signal in the canonical semaphore.

 */

static int

gen6_add_request(struct intel_ring_buffer *ring,

		 u32 *seqno)

{

	u32 mbox1_reg;

	u32 mbox2_reg;

	int ret;

	ret = intel_ring_begin(ring, 10);

	if (ret)

		return ret;

	mbox1_reg = ring->signal_mbox[0];

	mbox2_reg = ring->signal_mbox[1];

	*seqno = i915_gem_get_seqno(ring->dev);

	update_mboxes(ring, *seqno, mbox1_reg);

	update_mboxes(ring, *seqno, mbox2_reg);

	intel_ring_emit(ring, MI_STORE_DWORD_INDEX);

	intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);

	intel_ring_emit(ring, *seqno);

	intel_ring_emit(ring, MI_USER_INTERRUPT);

	intel_ring_advance(ring);

	return 0;

}

/**

 * intel_ring_sync - sync the waiter to the signaller on seqno

 *

 * @waiter - ring that is waiting

 * @signaller - ring which has, or will signal

 * @seqno - seqno which the waiter will block on

 */

static int

intel_ring_sync(struct intel_ring_buffer *waiter,

		struct intel_ring_buffer *signaller,

		int ring,

		u32 seqno)

{

	int ret;

	u32 dw1 = MI_SEMAPHORE_MBOX |

		  MI_SEMAPHORE_COMPARE |

		  MI_SEMAPHORE_REGISTER;

	ret = intel_ring_begin(waiter, 4);

	if (ret)

		return ret;

	intel_ring_emit(waiter, dw1 | signaller->semaphore_register[ring]);

	intel_ring_emit(waiter, seqno);

	intel_ring_emit(waiter, 0);

	intel_ring_emit(waiter, MI_NOOP);

	intel_ring_advance(waiter);

	return 0;

}

/* VCS->RCS (RVSYNC) or BCS->RCS (RBSYNC) */

int

render_ring_sync_to(struct intel_ring_buffer *waiter,

		    struct intel_ring_buffer *signaller,

		    u32 seqno)

{

//   WARN_ON(signaller->semaphore_register[RCS] == MI_SEMAPHORE_SYNC_INVALID);

	return intel_ring_sync(waiter,

			       signaller,

			       RCS,

			       seqno);

}

/* RCS->VCS (VRSYNC) or BCS->VCS (VBSYNC) */

int

gen6_bsd_ring_sync_to(struct intel_ring_buffer *waiter,

		      struct intel_ring_buffer *signaller,

		      u32 seqno)

{

//   WARN_ON(signaller->semaphore_register[VCS] == MI_SEMAPHORE_SYNC_INVALID);

	return intel_ring_sync(waiter,

			       signaller,

			       VCS,

			       seqno);

}

/* RCS->BCS (BRSYNC) or VCS->BCS (BVSYNC) */

int

gen6_blt_ring_sync_to(struct intel_ring_buffer *waiter,

		      struct intel_ring_buffer *signaller,

		      u32 seqno)

{

//   WARN_ON(signaller->semaphore_register[BCS] == MI_SEMAPHORE_SYNC_INVALID);

	return intel_ring_sync(waiter,

			       signaller,

			       BCS,

			       seqno);

}

#define PIPE_CONTROL_FLUSH(ring__, addr__)					\

do {									\

	intel_ring_emit(ring__, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |		\

		 PIPE_CONTROL_DEPTH_STALL);				\

	intel_ring_emit(ring__, (addr__) | PIPE_CONTROL_GLOBAL_GTT);			\

	intel_ring_emit(ring__, 0);							\

	intel_ring_emit(ring__, 0);							\

} while (0)

static int

pc_render_add_request(struct intel_ring_buffer *ring,

		      u32 *result)

{

	struct drm_device *dev = ring->dev;

	u32 seqno = i915_gem_get_seqno(dev);

	struct pipe_control *pc = ring->private;

	u32 scratch_addr = pc->gtt_offset + 128;

	int ret;

	/* For Ironlake, MI_USER_INTERRUPT was deprecated and apparently

	 * incoherent with writes to memory, i.e. completely fubar,

	 * so we need to use PIPE_NOTIFY instead.

	 *

	 * However, we also need to workaround the qword write

	 * incoherence by flushing the 6 PIPE_NOTIFY buffers out to

	 * memory before requesting an interrupt.

	 */

	ret = intel_ring_begin(ring, 32);

	if (ret)

		return ret;

	intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |

			PIPE_CONTROL_WRITE_FLUSH |

			PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE);

	intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);

	intel_ring_emit(ring, seqno);

	intel_ring_emit(ring, 0);

	PIPE_CONTROL_FLUSH(ring, scratch_addr);

	scratch_addr += 128; /* write to separate cachelines */

	PIPE_CONTROL_FLUSH(ring, scratch_addr);

	scratch_addr += 128;

	PIPE_CONTROL_FLUSH(ring, scratch_addr);

	scratch_addr += 128;

	PIPE_CONTROL_FLUSH(ring, scratch_addr);

	scratch_addr += 128;

	PIPE_CONTROL_FLUSH(ring, scratch_addr);

	scratch_addr += 128;

	PIPE_CONTROL_FLUSH(ring, scratch_addr);

	intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |

			PIPE_CONTROL_WRITE_FLUSH |

			PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE |

			PIPE_CONTROL_NOTIFY);

	intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);

	intel_ring_emit(ring, seqno);

	intel_ring_emit(ring, 0);

	intel_ring_advance(ring);

	*result = seqno;

	return 0;

}

static int

render_ring_add_request(struct intel_ring_buffer *ring,

			u32 *result)

{

	struct drm_device *dev = ring->dev;

	u32 seqno = i915_gem_get_seqno(dev);

	int ret;

	ret = intel_ring_begin(ring, 4);

	if (ret)

		return ret;

	intel_ring_emit(ring, MI_STORE_DWORD_INDEX);

	intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);

	intel_ring_emit(ring, seqno);

	intel_ring_emit(ring, MI_USER_INTERRUPT);

	intel_ring_advance(ring);

	*result = seqno;

	return 0;

}

static u32

gen6_ring_get_seqno(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	/* Workaround to force correct ordering between irq and seqno writes on

	 * ivb (and maybe also on snb) by reading from a CS register (like

	 * ACTHD) before reading the status page. */

	if (IS_GEN7(dev))

		intel_ring_get_active_head(ring);

	return intel_read_status_page(ring, I915_GEM_HWS_INDEX);

}

static u32

ring_get_seqno(struct intel_ring_buffer *ring)

{

	return intel_read_status_page(ring, I915_GEM_HWS_INDEX);

}

static u32

pc_render_get_seqno(struct intel_ring_buffer *ring)

{

	struct pipe_control *pc = ring->private;

	return pc->cpu_page[0];

}

static void

ironlake_enable_irq(drm_i915_private_t *dev_priv, u32 mask)

{

	dev_priv->gt_irq_mask &= ~mask;

	I915_WRITE(GTIMR, dev_priv->gt_irq_mask);

	POSTING_READ(GTIMR);

}

static void

ironlake_disable_irq(drm_i915_private_t *dev_priv, u32 mask)

{

	dev_priv->gt_irq_mask |= mask;

	I915_WRITE(GTIMR, dev_priv->gt_irq_mask);

	POSTING_READ(GTIMR);

}

static void

i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)

{

	dev_priv->irq_mask &= ~mask;

	I915_WRITE(IMR, dev_priv->irq_mask);

	POSTING_READ(IMR);

}

static void

i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)

{

	dev_priv->irq_mask |= mask;

	I915_WRITE(IMR, dev_priv->irq_mask);

	POSTING_READ(IMR);

}

static bool

render_ring_get_irq(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	if (!dev->irq_enabled)

		return false;

	spin_lock(&ring->irq_lock);

	if (ring->irq_refcount++ == 0) {

		if (HAS_PCH_SPLIT(dev))

			ironlake_enable_irq(dev_priv,

					    GT_PIPE_NOTIFY | GT_USER_INTERRUPT);

		else

			i915_enable_irq(dev_priv, I915_USER_INTERRUPT);

	}

	spin_unlock(&ring->irq_lock);

	return true;

}

static void

render_ring_put_irq(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	spin_lock(&ring->irq_lock);

	if (--ring->irq_refcount == 0) {

		if (HAS_PCH_SPLIT(dev))

			ironlake_disable_irq(dev_priv,

					     GT_USER_INTERRUPT |

					     GT_PIPE_NOTIFY);

		else

			i915_disable_irq(dev_priv, I915_USER_INTERRUPT);

	}

	spin_unlock(&ring->irq_lock);

}

void intel_ring_setup_status_page(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = ring->dev->dev_private;

	u32 mmio = 0;

	/* The ring status page addresses are no longer next to the rest of

	 * the ring registers as of gen7.

	 */

	if (IS_GEN7(dev)) {

		switch (ring->id) {

		case RING_RENDER:

			mmio = RENDER_HWS_PGA_GEN7;

			break;

		case RING_BLT:

			mmio = BLT_HWS_PGA_GEN7;

			break;

		case RING_BSD:

			mmio = BSD_HWS_PGA_GEN7;

			break;

		}

	} else if (IS_GEN6(ring->dev)) {

		mmio = RING_HWS_PGA_GEN6(ring->mmio_base);

	} else {

		mmio = RING_HWS_PGA(ring->mmio_base);

	}

	I915_WRITE(mmio, (u32)ring->status_page.gfx_addr);

	POSTING_READ(mmio);

}

static int

bsd_ring_flush(struct intel_ring_buffer *ring,

	       u32     invalidate_domains,

	       u32     flush_domains)

{

	int ret;

	ret = intel_ring_begin(ring, 2);

	if (ret)

		return ret;

	intel_ring_emit(ring, MI_FLUSH);

	intel_ring_emit(ring, MI_NOOP);

	intel_ring_advance(ring);

	return 0;

}

static int

ring_add_request(struct intel_ring_buffer *ring,

		 u32 *result)

{

	u32 seqno;

	int ret;

	ret = intel_ring_begin(ring, 4);

	if (ret)

		return ret;

	seqno = i915_gem_get_seqno(ring->dev);

	intel_ring_emit(ring, MI_STORE_DWORD_INDEX);

	intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);

	intel_ring_emit(ring, seqno);

	intel_ring_emit(ring, MI_USER_INTERRUPT);

	intel_ring_advance(ring);

	*result = seqno;

	return 0;

}

static bool

gen6_ring_get_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	if (!dev->irq_enabled)

	       return false;

	/* It looks like we need to prevent the gt from suspending while waiting

	 * for an notifiy irq, otherwise irqs seem to get lost on at least the

	 * blt/bsd rings on ivb. */

	if (IS_GEN7(dev))

		gen6_gt_force_wake_get(dev_priv);

	spin_lock(&ring->irq_lock);

	if (ring->irq_refcount++ == 0) {

		ring->irq_mask &= ~rflag;

		I915_WRITE_IMR(ring, ring->irq_mask);

		ironlake_enable_irq(dev_priv, gflag);

	}

	spin_unlock(&ring->irq_lock);

    return true;

}

static void

gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	spin_lock(&ring->irq_lock);

	if (--ring->irq_refcount == 0) {

		ring->irq_mask |= rflag;

		I915_WRITE_IMR(ring, ring->irq_mask);

		ironlake_disable_irq(dev_priv, gflag);

	}

	spin_unlock(&ring->irq_lock);

	if (IS_GEN7(dev))

		gen6_gt_force_wake_put(dev_priv);

}

static bool

bsd_ring_get_irq(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	if (!dev->irq_enabled)

		return false;

	spin_lock(&ring->irq_lock);

	if (ring->irq_refcount++ == 0) {

		if (IS_G4X(dev))

			i915_enable_irq(dev_priv, I915_BSD_USER_INTERRUPT);

		else

			ironlake_enable_irq(dev_priv, GT_BSD_USER_INTERRUPT);

	}

	spin_unlock(&ring->irq_lock);

	return true;

}

static void

bsd_ring_put_irq(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	spin_lock(&ring->irq_lock);

	if (--ring->irq_refcount == 0) {

		if (IS_G4X(dev))

			i915_disable_irq(dev_priv, I915_BSD_USER_INTERRUPT);

		else

			ironlake_disable_irq(dev_priv, GT_BSD_USER_INTERRUPT);

	}

	spin_unlock(&ring->irq_lock);

}

static int

ring_dispatch_execbuffer(struct intel_ring_buffer *ring, u32 offset, u32 length)

{

	int ret;

	ret = intel_ring_begin(ring, 2);

	if (ret)

		return ret;

	intel_ring_emit(ring,

			MI_BATCH_BUFFER_START | (2 << 6) |

			MI_BATCH_NON_SECURE_I965);

	intel_ring_emit(ring, offset);

	intel_ring_advance(ring);

	return 0;

}

static int

render_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,

				u32 offset, u32 len)

{

	struct drm_device *dev = ring->dev;

	int ret;

	if (IS_I830(dev) || IS_845G(dev)) {

		ret = intel_ring_begin(ring, 4);

		if (ret)

			return ret;

		intel_ring_emit(ring, MI_BATCH_BUFFER);

		intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);

		intel_ring_emit(ring, offset + len - 8);

		intel_ring_emit(ring, 0);

	} else {

		ret = intel_ring_begin(ring, 2);

		if (ret)

			return ret;

		if (INTEL_INFO(dev)->gen >= 4) {

			intel_ring_emit(ring,

					MI_BATCH_BUFFER_START | (2 << 6) |

					MI_BATCH_NON_SECURE_I965);

			intel_ring_emit(ring, offset);

		} else {

			intel_ring_emit(ring,

					MI_BATCH_BUFFER_START | (2 << 6));

			intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);

		}

	}

	intel_ring_advance(ring);

	return 0;

}

static void cleanup_status_page(struct intel_ring_buffer *ring)

{

	drm_i915_private_t *dev_priv = ring->dev->dev_private;

	struct drm_i915_gem_object *obj;

	obj = ring->status_page.obj;

	if (obj == NULL)

		return;

	kunmap(obj->pages[0]);

    i915_gem_object_unpin(obj);

	drm_gem_object_unreference(&obj->base);

	ring->status_page.obj = NULL;

	memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));

}

static int init_status_page(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	struct drm_i915_gem_object *obj;

	int ret;

	obj = i915_gem_alloc_object(dev, 4096);

	if (obj == NULL) {

		DRM_ERROR("Failed to allocate status page\n");

		ret = -ENOMEM;

		goto err;

	}

//    i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

	ret = i915_gem_object_pin(obj, 4096, true);

	if (ret != 0) {

		goto err_unref;

	}

	ring->status_page.gfx_addr = obj->gtt_offset;

    ring->status_page.page_addr = MapIoMem(obj->pages[0], 4096, PG_SW);

	if (ring->status_page.page_addr == NULL) {

		memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));

		goto err_unpin;

	}

	ring->status_page.obj = obj;

	memset(ring->status_page.page_addr, 0, PAGE_SIZE);

	intel_ring_setup_status_page(ring);

	DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",

			ring->name, ring->status_page.gfx_addr);

	return 0;

err_unpin:

	i915_gem_object_unpin(obj);

err_unref:

	drm_gem_object_unreference(&obj->base);

err:

	return ret;

}

int intel_init_ring_buffer(struct drm_device *dev,

			   struct intel_ring_buffer *ring)

{

	struct drm_i915_gem_object *obj;

	int ret;

	ring->dev = dev;

	INIT_LIST_HEAD(&ring->active_list);

	INIT_LIST_HEAD(&ring->request_list);

	INIT_LIST_HEAD(&ring->gpu_write_list);

//   init_waitqueue_head(&ring->irq_queue);

    spin_lock_init(&ring->irq_lock);

    ring->irq_mask = ~0;

	if (I915_NEED_GFX_HWS(dev)) {

       ret = init_status_page(ring);

       if (ret)

           return ret;

	}

    obj = i915_gem_alloc_object(dev, ring->size);

	if (obj == NULL) {

		DRM_ERROR("Failed to allocate ringbuffer\n");

		ret = -ENOMEM;

		goto err_hws;

	}

	ring->obj = obj;

    ret = i915_gem_object_pin(obj, PAGE_SIZE, true);

	if (ret)

		goto err_unref;

	ring->map.size = ring->size;

    ring->map.offset = get_bus_addr() + obj->gtt_offset;

	ring->map.type = 0;

	ring->map.flags = 0;

	ring->map.mtrr = 0;

//   drm_core_ioremap_wc(&ring->map, dev);

    ring->map.handle = ioremap(ring->map.offset, ring->map.size);

	if (ring->map.handle == NULL) {

		DRM_ERROR("Failed to map ringbuffer.\n");

		ret = -EINVAL;

		goto err_unpin;

	}

	ring->virtual_start = ring->map.handle;

	ret = ring->init(ring);

	if (ret)

		goto err_unmap;

	/* Workaround an erratum on the i830 which causes a hang if

	 * the TAIL pointer points to within the last 2 cachelines

	 * of the buffer.

	 */

	ring->effective_size = ring->size;

	if (IS_I830(ring->dev))

		ring->effective_size -= 128;

	return 0;

err_unmap:

    FreeKernelSpace(ring->virtual_start);

err_unpin:

	i915_gem_object_unpin(obj);

err_unref:

	drm_gem_object_unreference(&obj->base);

	ring->obj = NULL;

err_hws:

//   cleanup_status_page(ring);

	return ret;

}

void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring)

{

	struct drm_i915_private *dev_priv;

	int ret;

	if (ring->obj == NULL)

		return;

	/* Disable the ring buffer. The ring must be idle at this point */

	dev_priv = ring->dev->dev_private;

	ret = intel_wait_ring_idle(ring);

	if (ret)

		DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",

			  ring->name, ret);

	I915_WRITE_CTL(ring, 0);

//   drm_core_ioremapfree(&ring->map, ring->dev);

    i915_gem_object_unpin(ring->obj);

	drm_gem_object_unreference(&ring->obj->base);

	ring->obj = NULL;

	if (ring->cleanup)

		ring->cleanup(ring);

//   cleanup_status_page(ring);

}

static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring)

{

	unsigned int *virt;

	int rem = ring->size - ring->tail;

    ENTER();

	if (ring->space < rem) {