index : renesas/drm.git	android live master
	libdrm, cloned from git://anongit.freedesktop.org/mesa/drm	Laurent Pinchart

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path: root/bsd-core/mach64_drv.c

Age	Commit message (Collapse)	Author
2009-03-08	FreeBSD use kdev for kernel device name	vehemens
	Signed-off-by: Robert Noland <rnoland@2hip.net>
2009-02-27	Move vblank_init to driver load time.	Robert Noland
2008-10-10	[FreeBSD] Rework all of the memory allocations	Robert Noland
	Allocate memory from different pools. This allows the OS to track memory allocations for us, much like the linux memory debugging. This will ease tracking down memory leaks since the OS can track the number of allocations from each pool and help to point us in the right direction. Also replace drm_alloc and friends with static __inline__ versions while we are here.
2008-10-03	[FreeBSD] Don't explicitly bzero driver softc.	Robert Noland
	This is already handled for us. Suggested by John Baldwin
2008-10-03	[FreeBSD] Use M_WAITOK when allocating driver memory.	Robert Noland
	We don't explicitly check for error here and M_WAITOK will just put the process to sleep waiting on resources to become available. Suggested by John Baldwin
2008-09-10	Remove incomplete and obsolete free/net/open code.	vehemens
	Signed-off-by: Robert Noland <rnoland@2hip.net>
2008-09-08	[FreeBSD] We need to call drm_detach before we free dev->driver.	Robert Noland
	The driver is in control of the show, so when you try and unload a module the driver detach routine is called first. It is what drives the whole unload process and so lots of panics occur if dev->driver is already free.
2008-09-05	Need M_NOWAIT for malloc.	vehemens
	Signed-off-by: Robert Noland <rnoland@2hip.net>
2008-08-29	[FreeBSD] Use driver features macros and flags	vehemens
	Signed-off-by: Robert Noland <rnoland@2hip.net>
2008-08-29	[FreeBSD] Convert drm_driver to a pointer like linux.	vehemens
	Signed-off-by: Robert Noland <rnoland@2hip.net>
2008-05-27	[FreeBSD] Add vblank-rework support and get drivers building.	Robert Noland
	The i915 driver now works again.
2008-05-27	[FreeBSD] Convert from drm_device_t to struct drm_device for consistency.	Eric Anholt
2005-12-30	Merge patch from jhb to catch up with FreeBSD-current vgapci master device	Eric Anholt
	changes.
2005-11-11	Fix breakage from the move of driver ioctl externs to header files.	Eric Anholt
2005-08-05	Rename the driver hooks in the DRM to something a little more	Eric Anholt
	understandable: preinit -> load postinit -> (removed) presetup -> firstopen postsetup -> (removed) open_helper -> open prerelease -> preclose free_filp_priv -> postclose pretakedown -> lastclose postcleanup -> unload release -> reclaim_buffers_locked version -> (removed) postinit and version were replaced with generic code in the Linux DRM (drivers now set their version numbers and description in the driver structure, like on BSD). postsetup wasn't used at all. Fixes the savage hooks for initializing and tearing down mappings at the right times. Testing involved at least starting X, running glxgears, killing glxgears, exiting X, and repeating. Tested on: FreeBSD (g200, g400, r200, r128) Linux (r200, savage4)
2005-04-16	Use /*- to begin license blocks in BSD code to reduce diffs against FreeBSD	Eric Anholt
	CVS.
2004-11-06	Convert more drivers for bsd-core, moving the ioctl definitions to shared	Eric Anholt
	code. Remove the "drv" from sisdrv, as it's unnecessary. Use the drm_pci functions in i915 instead of per-os implementations of the same. Avoid whitespace within fields in drm_pciids.txt (one of the r300 definitions), since it breaks the bsd pciids script. Tested on sis, mga, r128. i915 needs more work.
2004-05-09	Add mach64 DRM module for BSD (untested, but compiles).	Eric Anholt

generated by cgit v1.2.3 (git 2.25.1) at 2025-12-06 21:58:40 +0000

/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
 */
/*
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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.h"
#include "i915_drm.h"
#include "i915_drv.h"

#define USER_INT_FLAG (1<<1)
#define VSYNC_PIPEB_FLAG (1<<5)
#define VSYNC_PIPEA_FLAG (1<<7)

#define MAX_NOPID ((u32)~0)

/**
 * i915_get_pipe - return the the pipe associated with a given plane
 * @dev: DRM device
 * @plane: plane to look for
 *
 * The Intel Mesa & 2D drivers call the vblank routines with a plane number
 * rather than a pipe number, since they may not always be equal.  This routine
 * maps the given @plane back to a pipe number.
 */
static int
i915_get_pipe(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u32 dspcntr;

	dspcntr = plane ? I915_READ(DSPBCNTR) : I915_READ(DSPACNTR);

	return dspcntr & DISPPLANE_SEL_PIPE_MASK ? 1 : 0;
}

/**
 * i915_get_plane - return the the plane associated with a given pipe
 * @dev: DRM device
 * @pipe: pipe to look for
 *
 * The Intel Mesa & 2D drivers call the vblank routines with a plane number
 * rather than a plane number, since they may not always be equal.  This routine
 * maps the given @pipe back to a plane number.
 */
static int
i915_get_plane(struct drm_device *dev, int pipe)
{
	if (i915_get_pipe(dev, 0) == pipe)
		return 0;
	return 1;
}

/**
 * i915_pipe_enabled - check if a pipe is enabled
 * @dev: DRM device
 * @pipe: pipe to check
 *
 * Reading certain registers when the pipe is disabled can hang the chip.
 * Use this routine to make sure the PLL is running and the pipe is active
 * before reading such registers if unsure.
 */
static int
i915_pipe_enabled(struct drm_device *dev, int pipe)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;

	if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
		return 1;

	return 0;
}

/**
 * Emit a synchronous flip.
 *
 * This function must be called with the drawable spinlock held.
 */
static void
i915_dispatch_vsync_flip(struct drm_device *dev, struct drm_drawable_info *drw,
			 int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
	u16 x1, y1, x2, y2;
	int pf_planes = 1 << plane;

	DRM_SPINLOCK_ASSERT(&dev->drw_lock);

	/* If the window is visible on the other plane, we have to flip on that
	 * plane as well.
	 */
	if (plane == 1) {
		x1 = sarea_priv->planeA_x;
		y1 = sarea_priv->planeA_y;
		x2 = x1 + sarea_priv->planeA_w;
		y2 = y1 + sarea_priv->planeA_h;
	} else {
		x1 = sarea_priv->planeB_x;
		y1 = sarea_priv->planeB_y;
		x2 = x1 + sarea_priv->planeB_w;
		y2 = y1 + sarea_priv->planeB_h;
	}

	if (x2 > 0 && y2 > 0) {
		int i, num_rects = drw->num_rects;
		struct drm_clip_rect *rect = drw->rects;

		for (i = 0; i < num_rects; i++)
			if (!(rect[i].x1 >= x2 || rect[i].y1 >= y2 ||
			      rect[i].x2 <= x1 || rect[i].y2 <= y1)) {
				pf_planes = 0x3;

				break;
			}
	}

	i915_dispatch_flip(dev, pf_planes, 1);
}

/**
 * Emit blits for scheduled buffer swaps.
 *
 * This function will be called with the HW lock held.
 */
static void i915_vblank_tasklet(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	struct list_head *list, *tmp, hits, *hit;
	int nhits, nrects, slice[2], upper[2], lower[2], i, num_pages;
	unsigned counter[2];
	struct drm_drawable_info *drw;
	drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
	u32 cpp = dev_priv->cpp,  offsets[3];
	u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
				XY_SRC_COPY_BLT_WRITE_ALPHA |
				XY_SRC_COPY_BLT_WRITE_RGB)
			     : XY_SRC_COPY_BLT_CMD;
	u32 pitchropcpp = (sarea_priv->pitch * cpp) | (0xcc << 16) |
			  (cpp << 23) | (1 << 24);
	RING_LOCALS;

	counter[0] = drm_vblank_count(dev, 0);
	counter[1] = drm_vblank_count(dev, 1);

	DRM_DEBUG("\n");

	INIT_LIST_HEAD(&hits);

	nhits = nrects = 0;

	/* No irqsave/restore necessary.  This tasklet may be run in an
	 * interrupt context or normal context, but we don't have to worry
	 * about getting interrupted by something acquiring the lock, because
	 * we are the interrupt context thing that acquires the lock.
	 */
	DRM_SPINLOCK(&dev_priv->swaps_lock);

	/* Find buffer swaps scheduled for this vertical blank */
	list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
		drm_i915_vbl_swap_t *vbl_swap =
			list_entry(list, drm_i915_vbl_swap_t, head);
		int pipe = i915_get_pipe(dev, vbl_swap->plane);

		if ((counter[pipe] - vbl_swap->sequence) > (1<<23))
			continue;

		list_del(list);
		dev_priv->swaps_pending--;
		drm_vblank_put(dev, pipe);

		DRM_SPINUNLOCK(&dev_priv->swaps_lock);
		DRM_SPINLOCK(&dev->drw_lock);

		drw = drm_get_drawable_info(dev, vbl_swap->drw_id);

		if (!drw) {
			DRM_SPINUNLOCK(&dev->drw_lock);
			drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
			DRM_SPINLOCK(&dev_priv->swaps_lock);
			continue;
		}

		list_for_each(hit, &hits) {
			drm_i915_vbl_swap_t *swap_cmp =
				list_entry(hit, drm_i915_vbl_swap_t, head);
			struct drm_drawable_info *drw_cmp =
				drm_get_drawable_info(dev, swap_cmp->drw_id);

			if (drw_cmp &&
			    drw_cmp->rects[0].y1 > drw->rects[0].y1) {
				list_add_tail(list, hit);
				break;
			}
		}

		DRM_SPINUNLOCK(&dev->drw_lock);

		/* List of hits was empty, or we reached the end of it */
		if (hit == &hits)
			list_add_tail(list, hits.prev);

		nhits++;

		DRM_SPINLOCK(&dev_priv->swaps_lock);
	}

	DRM_SPINUNLOCK(&dev_priv->swaps_lock);

	if (nhits == 0) {
		return;
	}

	i915_kernel_lost_context(dev);

	upper[0] = upper[1] = 0;
	slice[0] = max(sarea_priv->planeA_h / nhits, 1);
	slice[1] = max(sarea_priv->planeB_h / nhits, 1);
	lower[0] = sarea_priv->planeA_y + slice[0];
	lower[1] = sarea_priv->planeB_y + slice[0];

	offsets[0] = sarea_priv->front_offset;
	offsets[1] = sarea_priv->back_offset;
	offsets[2] = sarea_priv->third_offset;
	num_pages = sarea_priv->third_handle ? 3 : 2;

	DRM_SPINLOCK(&dev->drw_lock);

	/* Emit blits for buffer swaps, partitioning both outputs into as many
	 * slices as there are buffer swaps scheduled in order to avoid tearing
	 * (based on the assumption that a single buffer swap would always
	 * complete before scanout starts).
	 */
	for (i = 0; i++ < nhits;
	     upper[0] = lower[0], lower[0] += slice[0],
	     upper[1] = lower[1], lower[1] += slice[1]) {
		int init_drawrect = 1;

		if (i == nhits)
			lower[0] = lower[1] = sarea_priv->height;

		list_for_each(hit, &hits) {
			drm_i915_vbl_swap_t *swap_hit =
				list_entry(hit, drm_i915_vbl_swap_t, head);
			struct drm_clip_rect *rect;
			int num_rects, plane, front, back;
			unsigned short top, bottom;

			drw = drm_get_drawable_info(dev, swap_hit->drw_id);

			if (!drw)
				continue;

			plane = swap_hit->plane;

			if (swap_hit->flip) {
				i915_dispatch_vsync_flip(dev, drw, plane);
				continue;
			}

			if (init_drawrect) {
				BEGIN_LP_RING(6);

				OUT_RING(GFX_OP_DRAWRECT_INFO);
				OUT_RING(0);
				OUT_RING(0);
				OUT_RING(sarea_priv->width | sarea_priv->height << 16);
				OUT_RING(sarea_priv->width | sarea_priv->height << 16);
				OUT_RING(0);

				ADVANCE_LP_RING();

				sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;

				init_drawrect = 0;
			}

			rect = drw->rects;
			top = upper[plane];
			bottom = lower[plane];

			front = (dev_priv->sarea_priv->pf_current_page >>
				 (2 * plane)) & 0x3;
			back = (front + 1) % num_pages;

			for (num_rects = drw->num_rects; num_rects--; rect++) {
				int y1 = max(rect->y1, top);
				int y2 = min(rect->y2, bottom);

				if (y1 >= y2)
					continue;

				BEGIN_LP_RING(8);

				OUT_RING(cmd);
				OUT_RING(pitchropcpp);
				OUT_RING((y1 << 16) | rect->x1);
				OUT_RING((y2 << 16) | rect->x2);
				OUT_RING(offsets[front]);
				OUT_RING((y1 << 16) | rect->x1);
				OUT_RING(pitchropcpp & 0xffff);
				OUT_RING(offsets[back]);

				ADVANCE_LP_RING();
			}
		}
	}

	DRM_SPINUNLOCK(&dev->drw_lock);

	list_for_each_safe(hit, tmp, &hits) {
		drm_i915_vbl_swap_t *swap_hit =
			list_entry(hit, drm_i915_vbl_swap_t, head);

		list_del(hit);

		drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
	}
}
#if 0
static int i915_in_vblank(struct drm_device *dev, int pipe)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	unsigned long pipedsl, vblank, vtotal;
	unsigned long vbl_start, vbl_end, cur_line;

	pipedsl = pipe ? PIPEBDSL : PIPEADSL;
	vblank = pipe ? VBLANK_B : VBLANK_A;
	vtotal = pipe ? VTOTAL_B : VTOTAL_A;

	vbl_start = I915_READ(vblank) & VBLANK_START_MASK;
	vbl_end = (I915_READ(vblank) >> VBLANK_END_SHIFT) & VBLANK_END_MASK;

	cur_line = I915_READ(pipedsl);

	if (cur_line >= vbl_start)
		return 1;

	return 0;
}
#endif
u32 i915_get_vblank_counter(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	unsigned long high_frame;
	unsigned long low_frame;
	u32 high1, high2, low, count;
	int pipe;

	pipe = i915_get_pipe(dev, plane);
	high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
	low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;

	if (!i915_pipe_enabled(dev, pipe)) {
	    printk(KERN_ERR "trying to get vblank count for disabled "
		   "pipe %d\n", pipe);
	    return 0;
	}

	/*
	 * High & low register fields aren't synchronized, so make sure
	 * we get a low value that's stable across two reads of the high
	 * register.
	 */
	do {
		high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
			 PIPE_FRAME_HIGH_SHIFT);
		low =  ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
			PIPE_FRAME_LOW_SHIFT);
		high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
			 PIPE_FRAME_HIGH_SHIFT);
	} while (high1 != high2);

	count = (high1 << 8) | low;

	/*
	 * If we're in the middle of the vblank period, the
	 * above regs won't have been updated yet, so return
	 * an incremented count to stay accurate
	 */
#if 0
	if (i915_in_vblank(dev, pipe))
		count++;
#endif
	return count;
}

irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
{
	struct drm_device *dev = (struct drm_device *) arg;
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u16 temp;
	u32 pipea_stats, pipeb_stats;

	pipea_stats = I915_READ(I915REG_PIPEASTAT);
	pipeb_stats = I915_READ(I915REG_PIPEBSTAT);

	temp = I915_READ16(I915REG_INT_IDENTITY_R);

#if 0
	DRM_DEBUG("flag=%08x\n", temp);
#endif
	if (temp == 0)
		return IRQ_NONE;

	/*
	 * Clear the PIPE(A|B)STAT regs before the IIR otherwise
	 * we may get extra interrupts.
	 */
	if (temp & VSYNC_PIPEA_FLAG) {
		drm_handle_vblank(dev, i915_get_plane(dev, 0));
		I915_WRITE(I915REG_PIPEASTAT,
			   pipea_stats | I915_VBLANK_INTERRUPT_ENABLE |
			   I915_VBLANK_CLEAR);
	}
	if (temp & VSYNC_PIPEB_FLAG) {
		drm_handle_vblank(dev, i915_get_plane(dev, 1));
		I915_WRITE(I915REG_PIPEBSTAT,
			   pipeb_stats | I915_VBLANK_INTERRUPT_ENABLE |
			   I915_VBLANK_CLEAR);
	}

	I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
	(void) I915_READ16(I915REG_INT_IDENTITY_R); /* Flush posted write */

	temp &= (dev_priv->irq_enable_reg | USER_INT_FLAG | VSYNC_PIPEA_FLAG |
		 VSYNC_PIPEB_FLAG);

	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);

	if (temp & USER_INT_FLAG) {
		DRM_WAKEUP(&dev_priv->irq_queue);
#ifdef I915_HAVE_FENCE
		i915_fence_handler(dev);
#endif
	}

	if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
		if (dev_priv->swaps_pending > 0)
			drm_locked_tasklet(dev, i915_vblank_tasklet);
	}

	return IRQ_HANDLED;
}

int i915_emit_irq(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	RING_LOCALS;

	i915_kernel_lost_context(dev);

	DRM_DEBUG("\n");

	i915_emit_breadcrumb(dev);

	BEGIN_LP_RING(2);
	OUT_RING(0);
	OUT_RING(GFX_OP_USER_INTERRUPT);
	ADVANCE_LP_RING();

	return dev_priv->counter;
}

void i915_user_irq_on(drm_i915_private_t *dev_priv)
{
	DRM_SPINLOCK(&dev_priv->user_irq_lock);
	if (dev_priv->irq_enabled && (++dev_priv->user_irq_refcount == 1)){
		dev_priv->irq_enable_reg |= USER_INT_FLAG;
		I915_WRITE16(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
	}
	DRM_SPINUNLOCK(&dev_priv->user_irq_lock);

}

void i915_user_irq_off(drm_i915_private_t *dev_priv)
{
	DRM_SPINLOCK(&dev_priv->user_irq_lock);
	if (dev_priv->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
		//		dev_priv->irq_enable_reg &= ~USER_INT_FLAG;
		//		I915_WRITE16(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
	}
	DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
}


static int i915_wait_irq(struct drm_device * dev, int irq_nr)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int ret = 0;

	DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
		  READ_BREADCRUMB(dev_priv));

	if (READ_BREADCRUMB(dev_priv) >= irq_nr)
		return 0;

	i915_user_irq_on(dev_priv);
	DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
		    READ_BREADCRUMB(dev_priv) >= irq_nr);
	i915_user_irq_off(dev_priv);

	if (ret == -EBUSY) {
		DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
			  READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
	}

	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
	return ret;
}

/* Needs the lock as it touches the ring.
 */
int i915_irq_emit(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_irq_emit_t *emit = data;
	int result;

	LOCK_TEST_WITH_RETURN(dev, file_priv);

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	result = i915_emit_irq(dev);

	if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
		DRM_ERROR("copy_to_user\n");
		return -EFAULT;
	}

	return 0;
}

/* Doesn't need the hardware lock.
 */
int i915_irq_wait(struct drm_device *dev, void *data,
		  struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_irq_wait_t *irqwait = data;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	return i915_wait_irq(dev, irqwait->irq_seq);
}

int i915_enable_vblank(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int pipe = i915_get_pipe(dev, plane);

	switch (pipe) {
	case 0:
		dev_priv->irq_enable_reg |= VSYNC_PIPEA_FLAG;
		break;
	case 1:
		dev_priv->irq_enable_reg |= VSYNC_PIPEB_FLAG;
		break;
	default:
		DRM_ERROR("tried to enable vblank on non-existent pipe %d\n",
			  pipe);
		break;
	}

	I915_WRITE16(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);

	return 0;
}

void i915_disable_vblank(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int pipe = i915_get_pipe(dev, plane);

	switch (pipe) {
	case 0:
		dev_priv->irq_enable_reg &= ~VSYNC_PIPEA_FLAG;
		break;
	case 1:
		dev_priv->irq_enable_reg &= ~VSYNC_PIPEB_FLAG;
		break;
	default:
		DRM_ERROR("tried to disable vblank on non-existent pipe %d\n",
			  pipe);
		break;
	}

	I915_WRITE16(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
}

static void i915_enable_interrupt (struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	
	dev_priv->irq_enable_reg |= USER_INT_FLAG;

	I915_WRITE16(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
	dev_priv->irq_enabled = 1;
}

/* Set the vblank monitor pipe
 */
int i915_vblank_pipe_set(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_pipe_t *pipe = data;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
		DRM_ERROR("called with invalid pipe 0x%x\n", pipe->pipe);
		return -EINVAL;
	}

	dev_priv->vblank_pipe = pipe->pipe;

	return 0;
}

int i915_vblank_pipe_get(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_pipe_t *pipe = data;
	u16 flag;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	flag = I915_READ(I915REG_INT_ENABLE_R);
	pipe->pipe = 0;
	if (flag & VSYNC_PIPEA_FLAG)
		pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
	if (flag & VSYNC_PIPEB_FLAG)
		pipe->pipe |= DRM_I915_VBLANK_PIPE_B;

	return 0;
}

/**
 * Schedule buffer swap at given vertical blank.
 */
int i915_vblank_swap(struct drm_device *dev, void *data,
		     struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_swap_t *swap = data;
	drm_i915_vbl_swap_t *vbl_swap;
	unsigned int pipe, seqtype, curseq, plane;
	unsigned long irqflags;
	struct list_head *list;
	int ret;

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __func__);
		return -EINVAL;
	}

	if (dev_priv->sarea_priv->rotation) {
		DRM_DEBUG("Rotation not supported\n");
		return -EINVAL;
	}

	if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
			     _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS |
			     _DRM_VBLANK_FLIP)) {
		DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
		return -EINVAL;
	}

	plane = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
	pipe = i915_get_pipe(dev, plane);

	seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);

	if (!(dev_priv->vblank_pipe & (1 << pipe))) {
		DRM_ERROR("Invalid pipe %d\n", pipe);
		return -EINVAL;
	}

	DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags);

	/* It makes no sense to schedule a swap for a drawable that doesn't have
	 * valid information at this point. E.g. this could mean that the X
	 * server is too old to push drawable information to the DRM, in which