drivers/gpu/drm/nouveau/nouveau_display.c - maze/linux - Git at Google

 /*
  * Copyright (C) 2008 Maarten Maathuis.
  * All Rights Reserved.
  *
  * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
  *
  */

 #include "drmP.h"
 #include "drm_crtc_helper.h"
 #include "nouveau_drv.h"
 #include "nouveau_fb.h"
 #include "nouveau_fbcon.h"
 #include "nouveau_hw.h"
 #include "nouveau_crtc.h"
 #include "nouveau_dma.h"
 #include "nv50_display.h"

 static void
 nouveau_user_framebuffer_destroy(struct drm_framebuffer *drm_fb)
 {
 	struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);

 	if (fb->nvbo)
 		drm_gem_object_unreference_unlocked(fb->nvbo->gem);

 	drm_framebuffer_cleanup(drm_fb);
 	kfree(fb);
 }

 static int
 nouveau_user_framebuffer_create_handle(struct drm_framebuffer *drm_fb,
 				       struct drm_file *file_priv,
 				       unsigned int *handle)
 {
 	struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);

 	return drm_gem_handle_create(file_priv, fb->nvbo->gem, handle);
 }

 static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
 	.destroy = nouveau_user_framebuffer_destroy,
 	.create_handle = nouveau_user_framebuffer_create_handle,
 };

 int
 nouveau_framebuffer_init(struct drm_device *dev,
 			 struct nouveau_framebuffer *nv_fb,
 			 struct drm_mode_fb_cmd *mode_cmd,
 			 struct nouveau_bo *nvbo)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct drm_framebuffer *fb = &nv_fb->base;
 	int ret;

 	ret = drm_framebuffer_init(dev, fb, &nouveau_framebuffer_funcs);
 	if (ret) {
 		return ret;
 	}

 	drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 	nv_fb->nvbo = nvbo;

 	if (dev_priv->card_type >= NV_50) {
 		u32 tile_flags = nouveau_bo_tile_layout(nvbo);
 		if (tile_flags == 0x7a00 ||
 		    tile_flags == 0xfe00)
 			nv_fb->r_dma = NvEvoFB32;
 		else
 		if (tile_flags == 0x7000)
 			nv_fb->r_dma = NvEvoFB16;
 		else
 			nv_fb->r_dma = NvEvoVRAM_LP;

 		switch (fb->depth) {
 		case  8: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_8; break;
 		case 15: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_15; break;
 		case 16: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_16; break;
 		case 24:
 		case 32: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_24; break;
 		case 30: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_30; break;
 		default:
 			 NV_ERROR(dev, "unknown depth %d\n", fb->depth);
 			 return -EINVAL;
 		}

 		if (dev_priv->chipset == 0x50)
 			nv_fb->r_format |= (tile_flags << 8);

 		if (!tile_flags) {
 			if (dev_priv->card_type < NV_D0)
 				nv_fb->r_pitch = 0x00100000 | fb->pitch;
 			else
 				nv_fb->r_pitch = 0x01000000 | fb->pitch;
 		} else {
 			u32 mode = nvbo->tile_mode;
 			if (dev_priv->card_type >= NV_C0)
 				mode >>= 4;
 			nv_fb->r_pitch = ((fb->pitch / 4) << 4) | mode;
 		}
 	}

 	return 0;
 }

 static struct drm_framebuffer *
 nouveau_user_framebuffer_create(struct drm_device *dev,
 				struct drm_file *file_priv,
 				struct drm_mode_fb_cmd *mode_cmd)
 {
 	struct nouveau_framebuffer *nouveau_fb;
 	struct drm_gem_object *gem;
 	int ret;

 	gem = drm_gem_object_lookup(dev, file_priv, mode_cmd->handle);
 	if (!gem)
 		return ERR_PTR(-ENOENT);

 	nouveau_fb = kzalloc(sizeof(struct nouveau_framebuffer), GFP_KERNEL);
 	if (!nouveau_fb)
 		return ERR_PTR(-ENOMEM);

 	ret = nouveau_framebuffer_init(dev, nouveau_fb, mode_cmd, nouveau_gem_object(gem));
 	if (ret) {
 		drm_gem_object_unreference(gem);
 		return ERR_PTR(ret);
 	}

 	return &nouveau_fb->base;
 }

 const struct drm_mode_config_funcs nouveau_mode_config_funcs = {
 	.fb_create = nouveau_user_framebuffer_create,
 	.output_poll_changed = nouveau_fbcon_output_poll_changed,
 };

 int
 nouveau_vblank_enable(struct drm_device *dev, int crtc)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;

 	if (dev_priv->card_type >= NV_50)
 		nv_mask(dev, NV50_PDISPLAY_INTR_EN_1, 0,
 			NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc));
 	else
 		NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0,
 			    NV_PCRTC_INTR_0_VBLANK);

 	return 0;
 }

 void
 nouveau_vblank_disable(struct drm_device *dev, int crtc)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;

 	if (dev_priv->card_type >= NV_50)
 		nv_mask(dev, NV50_PDISPLAY_INTR_EN_1,
 			NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc), 0);
 	else
 		NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0, 0);
 }

 static int
 nouveau_page_flip_reserve(struct nouveau_bo *old_bo,
 			  struct nouveau_bo *new_bo)
 {
 	int ret;

 	ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM);
 	if (ret)
 		return ret;

 	ret = ttm_bo_reserve(&new_bo->bo, false, false, false, 0);
 	if (ret)
 		goto fail;

 	ret = ttm_bo_reserve(&old_bo->bo, false, false, false, 0);
 	if (ret)
 		goto fail_unreserve;

 	return 0;

 fail_unreserve:
 	ttm_bo_unreserve(&new_bo->bo);
 fail:
 	nouveau_bo_unpin(new_bo);
 	return ret;
 }

 static void
 nouveau_page_flip_unreserve(struct nouveau_bo *old_bo,
 			    struct nouveau_bo *new_bo,
 			    struct nouveau_fence *fence)
 {
 	nouveau_bo_fence(new_bo, fence);
 	ttm_bo_unreserve(&new_bo->bo);

 	nouveau_bo_fence(old_bo, fence);
 	ttm_bo_unreserve(&old_bo->bo);

 	nouveau_bo_unpin(old_bo);
 }

 static int
 nouveau_page_flip_emit(struct nouveau_channel *chan,
 		       struct nouveau_bo *old_bo,
 		       struct nouveau_bo *new_bo,
 		       struct nouveau_page_flip_state *s,
 		       struct nouveau_fence **pfence)
 {
 	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
 	struct drm_device *dev = chan->dev;
 	unsigned long flags;
 	int ret;

 	/* Queue it to the pending list */
 	spin_lock_irqsave(&dev->event_lock, flags);
 	list_add_tail(&s->head, &chan->nvsw.flip);
 	spin_unlock_irqrestore(&dev->event_lock, flags);

 	/* Synchronize with the old framebuffer */
 	ret = nouveau_fence_sync(old_bo->bo.sync_obj, chan);
 	if (ret)
 		goto fail;

 	/* Emit the pageflip */
 	ret = RING_SPACE(chan, 2);
 	if (ret)
 		goto fail;

 	if (dev_priv->card_type < NV_C0)
 		BEGIN_RING(chan, NvSubSw, NV_SW_PAGE_FLIP, 1);
 	else
 		BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0500, 1);
 	OUT_RING  (chan, 0);
 	FIRE_RING (chan);

 	ret = nouveau_fence_new(chan, pfence, true);
 	if (ret)
 		goto fail;

 	return 0;
 fail:
 	spin_lock_irqsave(&dev->event_lock, flags);
 	list_del(&s->head);
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 	return ret;
 }

 int
 nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 		       struct drm_pending_vblank_event *event)
 {
 	struct drm_device *dev = crtc->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_bo *old_bo = nouveau_framebuffer(crtc->fb)->nvbo;
 	struct nouveau_bo *new_bo = nouveau_framebuffer(fb)->nvbo;
 	struct nouveau_page_flip_state *s;
 	struct nouveau_channel *chan;
 	struct nouveau_fence *fence;
 	int ret;

 	if (!dev_priv->channel)
 		return -ENODEV;

 	s = kzalloc(sizeof(*s), GFP_KERNEL);
 	if (!s)
 		return -ENOMEM;

 	/* Don't let the buffers go away while we flip */
 	ret = nouveau_page_flip_reserve(old_bo, new_bo);
 	if (ret)
 		goto fail_free;

 	/* Initialize a page flip struct */
 	*s = (struct nouveau_page_flip_state)
 		{ { }, event, nouveau_crtc(crtc)->index,
 		  fb->bits_per_pixel, fb->pitch, crtc->x, crtc->y,
 		  new_bo->bo.offset };

 	/* Choose the channel the flip will be handled in */
 	chan = nouveau_fence_channel(new_bo->bo.sync_obj);
 	if (!chan)
 		chan = nouveau_channel_get_unlocked(dev_priv->channel);
 	mutex_lock(&chan->mutex);

 	/* Emit a page flip */
 	if (dev_priv->card_type >= NV_50) {
 		ret = nv50_display_flip_next(crtc, fb, chan);
 		if (ret) {
 			nouveau_channel_put(&chan);
 			goto fail_unreserve;
 		}
 	}

 	ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
 	nouveau_channel_put(&chan);
 	if (ret)
 		goto fail_unreserve;

 	/* Update the crtc struct and cleanup */
 	crtc->fb = fb;

 	nouveau_page_flip_unreserve(old_bo, new_bo, fence);
 	nouveau_fence_unref(&fence);
 	return 0;

 fail_unreserve:
 	nouveau_page_flip_unreserve(old_bo, new_bo, NULL);
 fail_free:
 	kfree(s);
 	return ret;
 }

 int
 nouveau_finish_page_flip(struct nouveau_channel *chan,
 			 struct nouveau_page_flip_state *ps)
 {
 	struct drm_device *dev = chan->dev;
 	struct nouveau_page_flip_state *s;
 	unsigned long flags;

 	spin_lock_irqsave(&dev->event_lock, flags);

 	if (list_empty(&chan->nvsw.flip)) {
 		NV_ERROR(dev, "Unexpected pageflip in channel %d.\n", chan->id);
 		spin_unlock_irqrestore(&dev->event_lock, flags);
 		return -EINVAL;
 	}

 	s = list_first_entry(&chan->nvsw.flip,
 			     struct nouveau_page_flip_state, head);
 	if (s->event) {
 		struct drm_pending_vblank_event *e = s->event;
 		struct timeval now;

 		do_gettimeofday(&now);
 		e->event.sequence = 0;
 		e->event.tv_sec = now.tv_sec;
 		e->event.tv_usec = now.tv_usec;
 		list_add_tail(&e->base.link, &e->base.file_priv->event_list);
 		wake_up_interruptible(&e->base.file_priv->event_wait);
 	}

 	list_del(&s->head);
 	if (ps)
 		*ps = *s;
 	kfree(s);

 	spin_unlock_irqrestore(&dev->event_lock, flags);
 	return 0;
 }
	/*
	* Copyright (C) 2008 Maarten Maathuis.
	* All Rights Reserved.
	*
	* 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
	*
	*/

	#include "drmP.h"
	#include "drm_crtc_helper.h"
	#include "nouveau_drv.h"
	#include "nouveau_fb.h"
	#include "nouveau_fbcon.h"
	#include "nouveau_hw.h"
	#include "nouveau_crtc.h"
	#include "nouveau_dma.h"
	#include "nv50_display.h"

	static void
	nouveau_user_framebuffer_destroy(struct drm_framebuffer *drm_fb)
	{
	struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);

	if (fb->nvbo)
	drm_gem_object_unreference_unlocked(fb->nvbo->gem);

	drm_framebuffer_cleanup(drm_fb);
	kfree(fb);
	}

	static int
	nouveau_user_framebuffer_create_handle(struct drm_framebuffer *drm_fb,
	struct drm_file *file_priv,
	unsigned int *handle)
	{
	struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);

	return drm_gem_handle_create(file_priv, fb->nvbo->gem, handle);
	}

	static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
	.destroy = nouveau_user_framebuffer_destroy,
	.create_handle = nouveau_user_framebuffer_create_handle,
	};

	int
	nouveau_framebuffer_init(struct drm_device *dev,
	struct nouveau_framebuffer *nv_fb,
	struct drm_mode_fb_cmd *mode_cmd,
	struct nouveau_bo *nvbo)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct drm_framebuffer *fb = &nv_fb->base;
	int ret;

	ret = drm_framebuffer_init(dev, fb, &nouveau_framebuffer_funcs);
	if (ret) {
	return ret;
	}

	drm_helper_mode_fill_fb_struct(fb, mode_cmd);
	nv_fb->nvbo = nvbo;

	if (dev_priv->card_type >= NV_50) {
	u32 tile_flags = nouveau_bo_tile_layout(nvbo);
	if (tile_flags == 0x7a00 \|\|
	tile_flags == 0xfe00)
	nv_fb->r_dma = NvEvoFB32;
	else
	if (tile_flags == 0x7000)
	nv_fb->r_dma = NvEvoFB16;
	else
	nv_fb->r_dma = NvEvoVRAM_LP;

	switch (fb->depth) {
	case 8: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_8; break;
	case 15: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_15; break;
	case 16: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_16; break;
	case 24:
	case 32: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_24; break;
	case 30: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_30; break;
	default:
	NV_ERROR(dev, "unknown depth %d\n", fb->depth);
	return -EINVAL;
	}

	if (dev_priv->chipset == 0x50)
	nv_fb->r_format \|= (tile_flags << 8);

	if (!tile_flags) {
	if (dev_priv->card_type < NV_D0)
	nv_fb->r_pitch = 0x00100000 \| fb->pitch;
	else
	nv_fb->r_pitch = 0x01000000 \| fb->pitch;
	} else {
	u32 mode = nvbo->tile_mode;
	if (dev_priv->card_type >= NV_C0)
	mode >>= 4;
	nv_fb->r_pitch = ((fb->pitch / 4) << 4) \| mode;
	}
	}

	return 0;
	}

	static struct drm_framebuffer *
	nouveau_user_framebuffer_create(struct drm_device *dev,
	struct drm_file *file_priv,
	struct drm_mode_fb_cmd *mode_cmd)
	{
	struct nouveau_framebuffer *nouveau_fb;
	struct drm_gem_object *gem;
	int ret;

	gem = drm_gem_object_lookup(dev, file_priv, mode_cmd->handle);
	if (!gem)
	return ERR_PTR(-ENOENT);

	nouveau_fb = kzalloc(sizeof(struct nouveau_framebuffer), GFP_KERNEL);
	if (!nouveau_fb)
	return ERR_PTR(-ENOMEM);

	ret = nouveau_framebuffer_init(dev, nouveau_fb, mode_cmd, nouveau_gem_object(gem));
	if (ret) {
	drm_gem_object_unreference(gem);
	return ERR_PTR(ret);
	}

	return &nouveau_fb->base;
	}

	const struct drm_mode_config_funcs nouveau_mode_config_funcs = {
	.fb_create = nouveau_user_framebuffer_create,
	.output_poll_changed = nouveau_fbcon_output_poll_changed,
	};

	int
	nouveau_vblank_enable(struct drm_device *dev, int crtc)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	if (dev_priv->card_type >= NV_50)
	nv_mask(dev, NV50_PDISPLAY_INTR_EN_1, 0,
	NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc));
	else
	NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0,
	NV_PCRTC_INTR_0_VBLANK);

	return 0;
	}

	void
	nouveau_vblank_disable(struct drm_device *dev, int crtc)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	if (dev_priv->card_type >= NV_50)
	nv_mask(dev, NV50_PDISPLAY_INTR_EN_1,
	NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc), 0);
	else
	NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0, 0);
	}

	static int
	nouveau_page_flip_reserve(struct nouveau_bo *old_bo,
	struct nouveau_bo *new_bo)
	{
	int ret;

	ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM);
	if (ret)
	return ret;

	ret = ttm_bo_reserve(&new_bo->bo, false, false, false, 0);
	if (ret)
	goto fail;

	ret = ttm_bo_reserve(&old_bo->bo, false, false, false, 0);
	if (ret)
	goto fail_unreserve;

	return 0;

	fail_unreserve:
	ttm_bo_unreserve(&new_bo->bo);
	fail:
	nouveau_bo_unpin(new_bo);
	return ret;
	}

	static void
	nouveau_page_flip_unreserve(struct nouveau_bo *old_bo,
	struct nouveau_bo *new_bo,
	struct nouveau_fence *fence)
	{
	nouveau_bo_fence(new_bo, fence);
	ttm_bo_unreserve(&new_bo->bo);

	nouveau_bo_fence(old_bo, fence);
	ttm_bo_unreserve(&old_bo->bo);

	nouveau_bo_unpin(old_bo);
	}

	static int
	nouveau_page_flip_emit(struct nouveau_channel *chan,
	struct nouveau_bo *old_bo,
	struct nouveau_bo *new_bo,
	struct nouveau_page_flip_state *s,
	struct nouveau_fence **pfence)
	{
	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
	struct drm_device *dev = chan->dev;
	unsigned long flags;
	int ret;

	/* Queue it to the pending list */
	spin_lock_irqsave(&dev->event_lock, flags);
	list_add_tail(&s->head, &chan->nvsw.flip);
	spin_unlock_irqrestore(&dev->event_lock, flags);

	/* Synchronize with the old framebuffer */
	ret = nouveau_fence_sync(old_bo->bo.sync_obj, chan);
	if (ret)
	goto fail;

	/* Emit the pageflip */
	ret = RING_SPACE(chan, 2);
	if (ret)
	goto fail;

	if (dev_priv->card_type < NV_C0)
	BEGIN_RING(chan, NvSubSw, NV_SW_PAGE_FLIP, 1);
	else
	BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0500, 1);
	OUT_RING (chan, 0);
	FIRE_RING (chan);

	ret = nouveau_fence_new(chan, pfence, true);
	if (ret)
	goto fail;

	return 0;
	fail:
	spin_lock_irqsave(&dev->event_lock, flags);
	list_del(&s->head);
	spin_unlock_irqrestore(&dev->event_lock, flags);
	return ret;
	}

	int
	nouveau_crtc_page_flip(struct drm_crtc crtc, struct drm_framebuffer fb,
	struct drm_pending_vblank_event *event)
	{
	struct drm_device *dev = crtc->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_bo *old_bo = nouveau_framebuffer(crtc->fb)->nvbo;
	struct nouveau_bo *new_bo = nouveau_framebuffer(fb)->nvbo;
	struct nouveau_page_flip_state *s;
	struct nouveau_channel *chan;
	struct nouveau_fence *fence;
	int ret;

	if (!dev_priv->channel)
	return -ENODEV;

	s = kzalloc(sizeof(*s), GFP_KERNEL);
	if (!s)
	return -ENOMEM;

	/* Don't let the buffers go away while we flip */
	ret = nouveau_page_flip_reserve(old_bo, new_bo);
	if (ret)
	goto fail_free;

	/* Initialize a page flip struct */
	*s = (struct nouveau_page_flip_state)
	{ { }, event, nouveau_crtc(crtc)->index,
	fb->bits_per_pixel, fb->pitch, crtc->x, crtc->y,
	new_bo->bo.offset };

	/* Choose the channel the flip will be handled in */
	chan = nouveau_fence_channel(new_bo->bo.sync_obj);
	if (!chan)
	chan = nouveau_channel_get_unlocked(dev_priv->channel);
	mutex_lock(&chan->mutex);

	/* Emit a page flip */
	if (dev_priv->card_type >= NV_50) {
	ret = nv50_display_flip_next(crtc, fb, chan);
	if (ret) {
	nouveau_channel_put(&chan);
	goto fail_unreserve;
	}
	}

	ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
	nouveau_channel_put(&chan);
	if (ret)
	goto fail_unreserve;

	/* Update the crtc struct and cleanup */
	crtc->fb = fb;

	nouveau_page_flip_unreserve(old_bo, new_bo, fence);
	nouveau_fence_unref(&fence);
	return 0;

	fail_unreserve:
	nouveau_page_flip_unreserve(old_bo, new_bo, NULL);
	fail_free:
	kfree(s);
	return ret;
	}

	int
	nouveau_finish_page_flip(struct nouveau_channel *chan,
	struct nouveau_page_flip_state *ps)
	{
	struct drm_device *dev = chan->dev;
	struct nouveau_page_flip_state *s;
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);

	if (list_empty(&chan->nvsw.flip)) {
	NV_ERROR(dev, "Unexpected pageflip in channel %d.\n", chan->id);
	spin_unlock_irqrestore(&dev->event_lock, flags);
	return -EINVAL;
	}

	s = list_first_entry(&chan->nvsw.flip,
	struct nouveau_page_flip_state, head);
	if (s->event) {
	struct drm_pending_vblank_event *e = s->event;
	struct timeval now;

	do_gettimeofday(&now);
	e->event.sequence = 0;
	e->event.tv_sec = now.tv_sec;
	e->event.tv_usec = now.tv_usec;
	list_add_tail(&e->base.link, &e->base.file_priv->event_list);
	wake_up_interruptible(&e->base.file_priv->event_wait);
	}

	list_del(&s->head);
	if (ps)
	ps = s;
	kfree(s);

	spin_unlock_irqrestore(&dev->event_lock, flags);
	return 0;
	}