/* drmstat.c -- DRM device status and testing program * Created: Tue Jan 5 08:19:24 1999 by faith@precisioninsight.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * 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 * PRECISION INSIGHT 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. * * Authors: Rickard E. (Rik) Faith * */ #include #include #include #include #include #include #include #include #include #include #include #include "xf86drm.h" int sigio_fd; static double usec(struct timeval *end, struct timeval *start) { double e = end->tv_sec * 1000000 + end->tv_usec; double s = start->tv_sec * 1000000 + start->tv_usec; return e - s; } static void getversion(int fd) { drmVersionPtr version; version = drmGetVersion(fd); if (version) { printf( "Name: %s\n", version->name ? version->name : "?" ); printf( " Version: %d.%d.%d\n", version->version_major, version->version_minor, version->version_patchlevel ); printf( " Date: %s\n", version->date ? version->date : "?" ); printf( " Desc: %s\n", version->desc ? version->desc : "?" ); drmFreeVersion(version); } else { printf( "No driver available\n" ); } } void handler(int fd, void *oldctx, void *newctx) { printf("Got fd %d\n", fd); } void process_sigio(char *device) { int fd; if ((fd = open(device, 0)) < 0) { drmError(-errno, __FUNCTION__); exit(1); } sigio_fd = fd; drmInstallSIGIOHandler(fd, handler); for (;;) sleep(60); } int main(int argc, char **argv) { int c; int r = 0; int fd = -1; drmHandle handle; void *address; char *pt; unsigned long count; unsigned long offset; unsigned long size; drmContext context; int loops; char buf[1024]; int i; drmBufInfoPtr info; drmBufMapPtr bufs; drmLockPtr lock; int secs; while ((c = getopt(argc, argv, "lc:vo:O:f:s:w:W:b:r:R:P:L:C:XS:B:F:")) != EOF) switch (c) { case 'F': count = strtoul(optarg, NULL, 0); if (!fork()) { dup(fd); sleep(count); } close(fd); break; case 'v': getversion(fd); break; case 'X': if ((r = drmCreateContext(fd, &context))) { drmError(r, argv[0]); return 1; } printf( "Got %d\n", context); break; case 'S': process_sigio(optarg); break; case 'C': if ((r = drmSwitchToContext(fd, strtoul(optarg, NULL, 0)))) { drmError(r, argv[0]); return 1; } break; case 'c': if ((r = drmSetBusid(fd,optarg))) { drmError(r, argv[0]); return 1; } break; case 'o': if ((fd = drmOpen(optarg, NULL)) < 0) { drmError(fd, argv[0]); return 1; } break; case 'O': if ((fd = drmOpen(NULL, optarg)) < 0) { drmError(fd, argv[0]); return 1; } break; case 'B': /* Test buffer allocation */ count = strtoul(optarg, &pt, 0); size = strtoul(pt+1, &pt, 0); secs = strtoul(pt+1, NULL, 0); { drmDMAReq dma; int *indices, *sizes; indices = alloca(sizeof(*indices) * count); sizes = alloca(sizeof(*sizes) * count); dma.context = context; dma.send_count = 0; dma.request_count = count; dma.request_size = size; dma.request_list = indices; dma.request_sizes = sizes; dma.flags = DRM_DMA_WAIT; if ((r = drmDMA(fd, &dma))) { drmError(r, argv[0]); return 1; } for (i = 0; i < dma.granted_count; i++) { printf("%5d: index = %d, size = %d\n", i, dma.request_list[i], dma.request_sizes[i]); } sleep(secs); drmFreeBufs(fd, dma.granted_count, indices); } break; case 'b': count = strtoul(optarg, &pt, 0); size = strtoul(pt+1, NULL, 0); if ((r = drmAddBufs(fd, count, size, 0, 65536)) < 0) { drmError(r, argv[0]); return 1; } if (!(info = drmGetBufInfo(fd))) { drmError(0, argv[0]); return 1; } for (i = 0; i < info->count; i++) { printf("%5d buffers of size %6d (low = %d, high = %d)\n", info->list[i].count, info->list[i].size, info->list[i].low_mark, info->list[i].high_mark); } if ((r = drmMarkBufs(fd, 0.50, 0.80))) { drmError(r, argv[0]); return 1; } if (!(info = drmGetBufInfo(fd))) { drmError(0, argv[0]); return 1; } for (i = 0; i < info->count; i++) { printf("%5d buffers of size %6d (low = %d, high = %d)\n", info->list[i].count, info->list[i].size, info->list[i].low_mark, info->list[i].high_mark); } printf("===== /proc/dri/0/mem =====\n"); sprintf(buf, "cat /proc/dri/0/mem"); system(buf); #if 1 if (!(bufs = drmMapBufs(fd))) { drmError(0, argv[0]); return 1; } printf("===============================\n"); printf( "%d bufs\n", bufs->count); for (i = 0; i < bufs->count; i++) { printf( " %4d: %8d bytes at %p\n", i, bufs->list[i].total, bufs->list[i].address); } printf("===== /proc/dri/0/vma =====\n"); sprintf(buf, "cat /proc/dri/0/vma"); system(buf); #endif break; case 'f': offset = strtoul(optarg, &pt, 0); size = strtoul(pt+1, NULL, 0); handle = 0; if ((r = drmAddMap(fd, offset, size, DRM_FRAME_BUFFER, 0, &handle))) { drmError(r, argv[0]); return 1; } printf("0x%08lx:0x%04lx added\n", offset, size); printf("===== /proc/dri/0/mem =====\n"); sprintf(buf, "cat /proc/dri/0/mem"); system(buf); break; case 'r': case 'R': offset = strtoul(optarg, &pt, 0); size = strtoul(pt+1, NULL, 0); handle = 0; if ((r = drmAddMap(fd, offset, size, DRM_REGISTERS, c == 'R' ? DRM_READ_ONLY : 0, &handle))) { drmError(r, argv[0]); return 1; } printf("0x%08lx:0x%04lx added\n", offset, size); printf("===== /proc/dri/0/mem =====\n"); sprintf(buf, "cat /proc/dri/0/mem"); system(buf); break; case 's': size = strtoul(optarg, &pt, 0); handle = 0; if ((r = drmAddMap(fd, 0, size, DRM_SHM, DRM_CONTAINS_LOCK, &handle))) { drmError(r, argv[0]); return 1; } printf("0x%04lx byte shm added at 0x%08lx\n", size, handle); sprintf(buf, "cat /proc/dri/0/vm"); system(buf); break; case 'P': offset = strtoul(optarg, &pt, 0); size = strtoul(pt+1, NULL, 0); address = NULL; if ((r = drmMap(fd, offset, size, &address))) { drmError(r, argv[0]); return 1; } printf("0x%08lx:0x%04lx mapped at %p for pid %d\n", offset, size, address, getpid()); printf("===== /proc/dri/0/vma =====\n"); sprintf(buf, "cat /proc/dri/0/vma"); system(buf); mprotect((void *)offset, size, PROT_READ); printf("===== /proc/dri/0/vma =====\n"); sprintf(buf, "cat /proc/dri/0/vma"); system(buf); break; case 'w': case 'W': offset = strtoul(optarg, &pt, 0); size = strtoul(pt+1, NULL, 0); address = NULL; if ((r = drmMap(fd, offset, size, &address))) { drmError(r, argv[0]); return 1; } printf("0x%08lx:0x%04lx mapped at %p for pid %d\n", offset, size, address, getpid()); printf("===== /proc/%d/maps =====\n", getpid()); sprintf(buf, "cat /proc/%d/maps", getpid()); system(buf); printf("===== /proc/dri/0/mem =====\n"); sprintf(buf, "cat /proc/dri/0/mem"); system(buf); printf("===== /proc/dri/0/vma =====\n"); sprintf(buf, "cat /proc/dri/0/vma"); system(buf); printf("===== READING =====\n"); for (i = 0; i < 0x10; i++) printf("%02x ", (unsigned int)((unsigned char *)address)[i]); printf("\n"); if (c == 'w') { printf("===== WRITING =====\n"); for (i = 0; i < size; i+=2) { ((char *)address)[i] = i & 0xff; ((char *)address)[i+1] = i & 0xff; } } printf("===== READING =====\n"); for (i = 0; i < 0x10; i++) printf("%02x ", (unsigned int)((unsigned char *)address)[i]); printf("\n"); printf("===== /proc/dri/0/vma =====\n"); sprintf(buf, "cat /proc/dri/0/vma"); system(buf); break; case 'L': context = strtoul(optarg, &pt, 0); offset = strtoul(pt+1, &pt, 0); size = strtoul(pt+1, &pt, 0); loops = strtoul(pt+1, NULL, 0); address = NULL; if ((r = drmMap(fd, offset, size, &address))) { drmError(r, argv[0]); return 1; } lock = address; #if 1 { int counter = 0; struct timeval loop_start, loop_end; struct timeval lock_start, lock_end; double wt; #define HISTOSIZE 9 int histo[HISTOSIZE]; int output = 0; int fast = 0; if (loops < 0) { loops = -loops; ++output; } for (i = 0; i < HISTOSIZE; i++) histo[i] = 0; gettimeofday(&loop_start, NULL); for (i = 0; i < loops; i++) { gettimeofday(&lock_start, NULL); DRM_LIGHT_LOCK_COUNT(fd,lock,context,fast); gettimeofday(&lock_end, NULL); DRM_UNLOCK(fd,lock,context); ++counter; wt = usec(&lock_end, &lock_start); if (wt <= 2.5) ++histo[8]; if (wt < 5.0) ++histo[0]; else if (wt < 50.0) ++histo[1]; else if (wt < 500.0) ++histo[2]; else if (wt < 5000.0) ++histo[3]; else if (wt < 50000.0) ++histo[4]; else if (wt < 500000.0) ++histo[5]; else if (wt < 5000000.0) ++histo[6]; else ++histo[7]; if (output) printf( "%.2f uSec, %d fast\n", wt, fast); } gettimeofday(&loop_end, NULL); printf( "Average wait time = %.2f usec, %d fast\n", usec(&loop_end, &loop_start) / counter, fast); printf( "%9d <= 2.5 uS\n", histo[8]); printf( "%9d < 5 uS\n", histo[0]); printf( "%9d < 50 uS\n", histo[1]); printf( "%9d < 500 uS\n", histo[2]); printf( "%9d < 5000 uS\n", histo[3]); printf( "%9d < 50000 uS\n", histo[4]); printf( "%9d < 500000 uS\n", histo[5]); printf( "%9d < 5000000 uS\n", histo[6]); printf( "%9d >= 5000000 uS\n", histo[7]); } #else printf( "before lock: 0x%08x\n", lock->lock); printf( "lock: 0x%08x\n", lock->lock); sleep(5); printf( "unlock: 0x%08x\n", lock->lock); #endif break; default: fprintf( stderr, "Usage: drmstat [options]\n" ); return 1; } return r; } void xf86VDrvMsgVerb(int scrnIndex, int type, int verb, const char *format, va_list args) { vfprintf(stderr, format, args); } int xf86ConfigDRI[10]; 75'>275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 
/* via_irq.c
 *
 * Copyright 2004 BEAM Ltd.
 * Copyright 2002 Tungsten Graphics, Inc.
 * Copyright 2005 Thomas Hellstrom.
 * 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
 * BEAM LTD, 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.
 *
 * Authors:
 *    Terry Barnaby <terry1@beam.ltd.uk>
 *    Keith Whitwell <keith@tungstengraphics.com>
 *    Thomas Hellstrom <unichrome@shipmail.org>
 *
 * This code provides standard DRM access to the Via Unichrome / Pro Vertical blank
 * interrupt, as well as an infrastructure to handle other interrupts of the chip.
 * The refresh rate is also calculated for video playback sync purposes.
 */

#include "via.h"
#include "drmP.h"
#include "drm.h"
#include "via_drm.h"
#include "via_drv.h"

#define VIA_REG_INTERRUPT       0x200

/* VIA_REG_INTERRUPT */
#define VIA_IRQ_GLOBAL          (1 << 31)
#define VIA_IRQ_VBLANK_ENABLE   (1 << 19)
#define VIA_IRQ_VBLANK_PENDING  (1 << 3)
#define VIA_IRQ_HQV0_ENABLE     (1 << 11)
#define VIA_IRQ_HQV1_ENABLE     (1 << 25)
#define VIA_IRQ_HQV0_PENDING    (1 << 9)
#define VIA_IRQ_HQV1_PENDING    (1 << 10)

/*
 * Device-specific IRQs go here. This type might need to be extended with
 * the register if there are multiple IRQ control registers.
 * Currently we activate the HQV interrupts of  Unichrome Pro group A. 
 */

static maskarray_t via_pro_group_a_irqs[] = {
	{VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010, 0x00000000 },
	{VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010, 0x00000000 }};
static int via_num_pro_group_a = sizeof(via_pro_group_a_irqs)/sizeof(maskarray_t);

static maskarray_t via_unichrome_irqs[] = {};
static int via_num_unichrome = sizeof(via_unichrome_irqs)/sizeof(maskarray_t);


static unsigned time_diff(struct timeval *now,struct timeval *then) 
{
    return (now->tv_usec >= then->tv_usec) ?
        now->tv_usec - then->tv_usec :
        1000000 - (then->tv_usec - now->tv_usec);
}

irqreturn_t via_driver_irq_handler(DRM_IRQ_ARGS)
{
	drm_device_t *dev = (drm_device_t *) arg;
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	u32 status;
	int handled = 0;
	struct timeval cur_vblank;
	drm_via_irq_t *cur_irq = dev_priv->via_irqs;
	int i;

	status = VIA_READ(VIA_REG_INTERRUPT);
	if (status & VIA_IRQ_VBLANK_PENDING) {
		atomic_inc(&dev->vbl_received);
                if (!(atomic_read(&dev->vbl_received) & 0x0F)) {
			do_gettimeofday(&cur_vblank);
                        if (dev_priv->last_vblank_valid) {
				dev_priv->usec_per_vblank = 
					time_diff( &cur_vblank,&dev_priv->last_vblank) >> 4;
			}
			dev_priv->last_vblank = cur_vblank;
			dev_priv->last_vblank_valid = 1;
                }
                if (!(atomic_read(&dev->vbl_received) & 0xFF)) {
			DRM_DEBUG("US per vblank is: %u\n",
				dev_priv->usec_per_vblank);
		}
		DRM_WAKEUP(&dev->vbl_queue);
		DRM(vbl_send_signals)( dev );
		handled = 1;
	}
	

	for (i=0; i<dev_priv->num_irqs; ++i) {
		if (status & cur_irq->pending_mask) {
			atomic_inc( &cur_irq->irq_received );
			DRM_WAKEUP( &cur_irq->irq_queue );
			handled = 1;
		}
		cur_irq++;
	}
	
	/* Acknowlege interrupts */
	VIA_WRITE(VIA_REG_INTERRUPT, status);


	if (handled)
		return IRQ_HANDLED;
	else
		return IRQ_NONE;
}

static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t * dev_priv)
{
	u32 status;

	if (dev_priv) {
		/* Acknowlege interrupts */
		status = VIA_READ(VIA_REG_INTERRUPT);
		VIA_WRITE(VIA_REG_INTERRUPT, status | 
			  dev_priv->irq_pending_mask);
	}
}

int via_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
{
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	unsigned int cur_vblank;
	int ret = 0;

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

	viadrv_acknowledge_irqs(dev_priv);

	/* Assume that the user has missed the current sequence number
	 * by about a day rather than she wants to wait for years
	 * using vertical blanks...
	 */

	DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
		    (((cur_vblank = atomic_read(&dev->vbl_received)) -
		      *sequence) <= (1 << 23)));
	
	*sequence = cur_vblank;
	return ret;
}

static int 
via_driver_irq_wait(drm_device_t * dev, unsigned int irq, int force_sequence,
		    unsigned int *sequence)
{
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	unsigned int cur_irq_sequence;
	drm_via_irq_t *cur_irq = dev_priv->via_irqs;
	int ret = 0;
	maskarray_t *masks = dev_priv->irq_masks;

	DRM_DEBUG("%s\n", __FUNCTION__);

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

	if (irq >= dev_priv->num_irqs ) {
		DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__, irq);
		return DRM_ERR(EINVAL);
	}
		
	cur_irq += irq;

	if (masks[irq][2] && !force_sequence) {
		DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
			    ((VIA_READ(masks[irq][2]) & masks[irq][3]) == masks[irq][4]));
		cur_irq_sequence = atomic_read(&cur_irq->irq_received);
	} else {
		DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
			    (((cur_irq_sequence = atomic_read(&cur_irq->irq_received)) -
			      *sequence) <= (1 << 23)));		
	}
	*sequence = cur_irq_sequence;
	return ret;
}


/*
 * drm_dma.h hooks
 */

void via_driver_irq_preinstall(drm_device_t * dev)
{
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	u32 status;
	drm_via_irq_t *cur_irq = dev_priv->via_irqs;
	int i;

	DRM_DEBUG("driver_irq_preinstall: dev_priv: %p\n", dev_priv);
	if (dev_priv) {

		dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
		dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;

		dev_priv->irq_masks = (dev_priv->pro_group_a) ?
			via_pro_group_a_irqs : via_unichrome_irqs;
		dev_priv->num_irqs = (dev_priv->pro_group_a) ?
			via_num_pro_group_a : via_num_unichrome;
		
		for(i=0; i < dev_priv->num_irqs; ++i) {
			atomic_set(&cur_irq->irq_received, 0);
			cur_irq->enable_mask = dev_priv->irq_masks[i][0]; 
			cur_irq->pending_mask = dev_priv->irq_masks[i][1];
			DRM_INIT_WAITQUEUE( &cur_irq->irq_queue );
			dev_priv->irq_enable_mask |= cur_irq->enable_mask;
			dev_priv->irq_pending_mask |= cur_irq->pending_mask;
			cur_irq++;
			
			DRM_DEBUG("Initializing IRQ %d\n", i);
		}
			
	        dev_priv->last_vblank_valid = 0;

		// Clear VSync interrupt regs
		status = VIA_READ(VIA_REG_INTERRUPT);
		VIA_WRITE(VIA_REG_INTERRUPT, status & 
			  ~(dev_priv->irq_enable_mask));
		
		/* Clear bits if they're already high */
		viadrv_acknowledge_irqs(dev_priv);
	}
}

void via_driver_irq_postinstall(drm_device_t * dev)
{
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	u32 status;

	DRM_DEBUG("via_driver_irq_postinstall\n");
	if (dev_priv) {
		status = VIA_READ(VIA_REG_INTERRUPT);
		VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
			  | dev_priv->irq_enable_mask);

		/* Some magic, oh for some data sheets ! */

		VIA_WRITE8(0x83d4, 0x11);
		VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
		
	}
}

void via_driver_irq_uninstall(drm_device_t * dev)
{
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	u32 status;

	DRM_DEBUG("driver_irq_uninstall)\n");
	if (dev_priv) {

		/* Some more magic, oh for some data sheets ! */

		VIA_WRITE8(0x83d4, 0x11);
		VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);

		status = VIA_READ(VIA_REG_INTERRUPT);
		VIA_WRITE(VIA_REG_INTERRUPT, status & 
			  ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
	}
}

int via_wait_irq(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;

	drm_via_irqwait_t __user *argp = (void __user *)data;
	drm_via_irqwait_t irqwait;
	struct timeval now;
	int ret = 0;
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	drm_via_irq_t *cur_irq = dev_priv->via_irqs;
	int force_sequence;

	if (!dev->irq)
		return DRM_ERR(EINVAL);

	DRM_COPY_FROM_USER_IOCTL(irqwait, argp, sizeof(irqwait));
	if (irqwait.request.irq >= dev_priv->num_irqs) {
		DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__, 
			  irqwait.request.irq);
		return DRM_ERR(EINVAL);
	}

	cur_irq += irqwait.request.irq;

	switch (irqwait.request.type & ~VIA_IRQ_FLAGS_MASK) {
	case VIA_IRQ_RELATIVE:
		irqwait.request.sequence += atomic_read(&cur_irq->irq_received);
		irqwait.request.type &= ~_DRM_VBLANK_RELATIVE;
	case VIA_IRQ_ABSOLUTE:
		break;
	default:
		return DRM_ERR(EINVAL);
	}

	if (irqwait.request.type & VIA_IRQ_SIGNAL) {
		DRM_ERROR("%s Signals on Via IRQs not implemented yet.\n", 
			  __FUNCTION__);
		return DRM_ERR(EINVAL);
	}

	force_sequence = (irqwait.request.type & VIA_IRQ_FORCE_SEQUENCE);

	ret = via_driver_irq_wait(dev, irqwait.request.irq, force_sequence,
				  &irqwait.request.sequence);
	do_gettimeofday(&now);
	irqwait.reply.tval_sec = now.tv_sec;
	irqwait.reply.tval_usec = now.tv_usec;

	DRM_COPY_TO_USER_IOCTL(argp, irqwait, sizeof(irqwait));

	return ret;
}
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