drivers/char/drm/radeon_irq.c

   1 /* radeon_irq.c -- IRQ handling for radeon -*- linux-c -*-
   2  *
   3  * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
   4  *
   5  * The Weather Channel (TM) funded Tungsten Graphics to develop the
   6  * initial release of the Radeon 8500 driver under the XFree86 license.
   7  * This notice must be preserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  26  * DEALINGS IN THE SOFTWARE.
  27  *
  28  * Authors:
  29  *    Keith Whitwell <keith@tungstengraphics.com>
  30  *    Michel D�zer <michel@daenzer.net>
  31  */
  32
  33 #include "drmP.h"
  34 #include "drm.h"
  35 #include "radeon_drm.h"
  36 #include "radeon_drv.h"
  37
  38 static __inline__ u32 radeon_acknowledge_irqs(drm_radeon_private_t *dev_priv, u32 mask)
  39 {
  40         u32 irqs = RADEON_READ(RADEON_GEN_INT_STATUS) & mask;
  41         if (irqs)
  42                 RADEON_WRITE(RADEON_GEN_INT_STATUS, irqs);
  43         return irqs;
  44 }
  45
  46 /* Interrupts - Used for device synchronization and flushing in the
  47  * following circumstances:
  48  *
  49  * - Exclusive FB access with hw idle:
  50  *    - Wait for GUI Idle (?) interrupt, then do normal flush.
  51  *
  52  * - Frame throttling, NV_fence:
  53  *    - Drop marker irq's into command stream ahead of time.
  54  *    - Wait on irq's with lock *not held*
  55  *    - Check each for termination condition
  56  *
  57  * - Internally in cp_getbuffer, etc:
  58  *    - as above, but wait with lock held???
  59  *
  60  * NOTE: These functions are misleadingly named -- the irq's aren't
  61  * tied to dma at all, this is just a hangover from dri prehistory.
  62  */
  63
  64 irqreturn_t radeon_driver_irq_handler( DRM_IRQ_ARGS )
  65 {
  66         drm_device_t *dev = (drm_device_t *) arg;
  67         drm_radeon_private_t *dev_priv =
  68            (drm_radeon_private_t *)dev->dev_private;
  69         u32 stat;
  70
  71         /* Only consider the bits we're interested in - others could be used
  72          * outside the DRM
  73          */
  74         stat = radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK |
  75                                                   RADEON_CRTC_VBLANK_STAT));
  76         if (!stat)
  77                 return IRQ_NONE;
  78
  79         /* SW interrupt */
  80         if (stat & RADEON_SW_INT_TEST) {
  81                 DRM_WAKEUP( &dev_priv->swi_queue );
  82         }
  83
  84         /* VBLANK interrupt */
  85         if (stat & RADEON_CRTC_VBLANK_STAT) {
  86                 atomic_inc(&dev->vbl_received);
  87                 DRM_WAKEUP(&dev->vbl_queue);
  88                 drm_vbl_send_signals( dev );
  89         }
  90
  91         return IRQ_HANDLED;
  92 }
  93
  94 static int radeon_emit_irq(drm_device_t *dev)
  95 {
  96         drm_radeon_private_t *dev_priv = dev->dev_private;
  97         unsigned int ret;
  98         RING_LOCALS;
  99
 100         atomic_inc(&dev_priv->swi_emitted);
 101         ret = atomic_read(&dev_priv->swi_emitted);
 102
 103         BEGIN_RING( 4 );
 104         OUT_RING_REG( RADEON_LAST_SWI_REG, ret );
 105         OUT_RING_REG( RADEON_GEN_INT_STATUS, RADEON_SW_INT_FIRE );
 106         ADVANCE_RING();
 107         COMMIT_RING();
 108
 109         return ret;
 110 }
 111
 112
 113 static int radeon_wait_irq(drm_device_t *dev, int swi_nr)
 114 {
 115         drm_radeon_private_t *dev_priv =
 116            (drm_radeon_private_t *)dev->dev_private;
 117         int ret = 0;
 118
 119         if (RADEON_READ( RADEON_LAST_SWI_REG ) >= swi_nr)
 120                 return 0;
 121
 122         dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
 123
 124         DRM_WAIT_ON( ret, dev_priv->swi_queue, 3 * DRM_HZ,
 125                      RADEON_READ( RADEON_LAST_SWI_REG ) >= swi_nr );
 126
 127         return ret;
 128 }
 129
 130 int radeon_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 131 {
 132         drm_radeon_private_t *dev_priv =
 133            (drm_radeon_private_t *)dev->dev_private;
 134         unsigned int cur_vblank;
 135         int ret = 0;
 136
 137         if ( !dev_priv ) {
 138                 DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
 139                 return DRM_ERR(EINVAL);
 140         }
 141
 142         radeon_acknowledge_irqs(dev_priv, RADEON_CRTC_VBLANK_STAT);
 143
 144         dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
 145
 146         /* Assume that the user has missed the current sequence number
 147          * by about a day rather than she wants to wait for years
 148          * using vertical blanks...
 149          */
 150         DRM_WAIT_ON( ret, dev->vbl_queue, 3*DRM_HZ,
 151                      ( ( ( cur_vblank = atomic_read(&dev->vbl_received ) )
 152                          - *sequence ) <= (1<<23) ) );
 153
 154         *sequence = cur_vblank;
 155
 156         return ret;
 157 }
 158
 159
 160 /* Needs the lock as it touches the ring.
 161  */
 162 int radeon_irq_emit( DRM_IOCTL_ARGS )
 163 {
 164         DRM_DEVICE;
 165         drm_radeon_private_t *dev_priv = dev->dev_private;
 166         drm_radeon_irq_emit_t emit;
 167         int result;
 168
 169         LOCK_TEST_WITH_RETURN( dev, filp );
 170
 171         if ( !dev_priv ) {
 172                 DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
 173                 return DRM_ERR(EINVAL);
 174         }
 175
 176         DRM_COPY_FROM_USER_IOCTL( emit, (drm_radeon_irq_emit_t __user *)data,
 177                                   sizeof(emit) );
 178
 179         result = radeon_emit_irq( dev );
 180
 181         if ( DRM_COPY_TO_USER( emit.irq_seq, &result, sizeof(int) ) ) {
 182                 DRM_ERROR( "copy_to_user\n" );
 183                 return DRM_ERR(EFAULT);
 184         }
 185
 186         return 0;
 187 }
 188
 189
 190 /* Doesn't need the hardware lock.
 191  */
 192 int radeon_irq_wait( DRM_IOCTL_ARGS )
 193 {
 194         DRM_DEVICE;
 195         drm_radeon_private_t *dev_priv = dev->dev_private;
 196         drm_radeon_irq_wait_t irqwait;
 197
 198         if ( !dev_priv ) {
 199                 DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
 200                 return DRM_ERR(EINVAL);
 201         }
 202
 203         DRM_COPY_FROM_USER_IOCTL( irqwait, (drm_radeon_irq_wait_t __user*)data,
 204                                   sizeof(irqwait) );
 205
 206         return radeon_wait_irq( dev, irqwait.irq_seq );
 207 }
 208
 209
 210 /* drm_dma.h hooks
 211 */
 212 void radeon_driver_irq_preinstall( drm_device_t *dev ) {
 213         drm_radeon_private_t *dev_priv =
 214                 (drm_radeon_private_t *)dev->dev_private;
 215
 216         /* Disable *all* interrupts */
 217         RADEON_WRITE( RADEON_GEN_INT_CNTL, 0 );
 218
 219         /* Clear bits if they're already high */
 220         radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK |
 221                                            RADEON_CRTC_VBLANK_STAT));
 222 }
 223
 224 void radeon_driver_irq_postinstall( drm_device_t *dev ) {
 225         drm_radeon_private_t *dev_priv =
 226                 (drm_radeon_private_t *)dev->dev_private;
 227
 228         atomic_set(&dev_priv->swi_emitted, 0);
 229         DRM_INIT_WAITQUEUE( &dev_priv->swi_queue );
 230
 231         /* Turn on SW and VBL ints */
 232         RADEON_WRITE( RADEON_GEN_INT_CNTL,
 233                       RADEON_CRTC_VBLANK_MASK |
 234                       RADEON_SW_INT_ENABLE );
 235 }
 236
 237 void radeon_driver_irq_uninstall( drm_device_t *dev ) {
 238         drm_radeon_private_t *dev_priv =
 239                 (drm_radeon_private_t *)dev->dev_private;
 240         if (!dev_priv)
 241                 return;
 242
 243         /* Disable *all* interrupts */
 244         RADEON_WRITE( RADEON_GEN_INT_CNTL, 0 );
 245 }