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,
  39                                               u32 mask)
  40 {
  41         u32 irqs = RADEON_READ(RADEON_GEN_INT_STATUS) & mask;
  42         if (irqs)
  43                 RADEON_WRITE(RADEON_GEN_INT_STATUS, irqs);
  44         return irqs;
  45 }
  46
  47 /* Interrupts - Used for device synchronization and flushing in the
  48  * following circumstances:
  49  *
  50  * - Exclusive FB access with hw idle:
  51  *    - Wait for GUI Idle (?) interrupt, then do normal flush.
  52  *
  53  * - Frame throttling, NV_fence:
  54  *    - Drop marker irq's into command stream ahead of time.
  55  *    - Wait on irq's with lock *not held*
  56  *    - Check each for termination condition
  57  *
  58  * - Internally in cp_getbuffer, etc:
  59  *    - as above, but wait with lock held???
  60  *
  61  * NOTE: These functions are misleadingly named -- the irq's aren't
  62  * tied to dma at all, this is just a hangover from dri prehistory.
  63  */
  64
  65 irqreturn_t radeon_driver_irq_handler(DRM_IRQ_ARGS)
  66 {
  67         drm_device_t *dev = (drm_device_t *) arg;
  68         drm_radeon_private_t *dev_priv =
  69             (drm_radeon_private_t *) dev->dev_private;
  70         u32 stat;
  71
  72         /* Only consider the bits we're interested in - others could be used
  73          * outside the DRM
  74          */
  75         stat = radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK |
  76                                                   RADEON_CRTC_VBLANK_STAT));
  77         if (!stat)
  78                 return IRQ_NONE;
  79
  80         /* SW interrupt */
  81         if (stat & RADEON_SW_INT_TEST) {
  82                 DRM_WAKEUP(&dev_priv->swi_queue);
  83         }
  84
  85         /* VBLANK interrupt */
  86         if (stat & RADEON_CRTC_VBLANK_STAT) {
  87                 atomic_inc(&dev->vbl_received);
  88                 DRM_WAKEUP(&dev->vbl_queue);
  89                 drm_vbl_send_signals(dev);
  90         }
  91
  92         return IRQ_HANDLED;
  93 }
  94
  95 static int radeon_emit_irq(drm_device_t * dev)
  96 {
  97         drm_radeon_private_t *dev_priv = dev->dev_private;
  98         unsigned int ret;
  99         RING_LOCALS;
 100
 101         atomic_inc(&dev_priv->swi_emitted);
 102         ret = atomic_read(&dev_priv->swi_emitted);
 103
 104         BEGIN_RING(4);
 105         OUT_RING_REG(RADEON_LAST_SWI_REG, ret);
 106         OUT_RING_REG(RADEON_GEN_INT_STATUS, RADEON_SW_INT_FIRE);
 107         ADVANCE_RING();
 108         COMMIT_RING();
 109
 110         return ret;
 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 /* Needs the lock as it touches the ring.
 160  */
 161 int radeon_irq_emit(DRM_IOCTL_ARGS)
 162 {
 163         DRM_DEVICE;
 164         drm_radeon_private_t *dev_priv = dev->dev_private;
 165         drm_radeon_irq_emit_t emit;
 166         int result;
 167
 168         LOCK_TEST_WITH_RETURN(dev, filp);
 169
 170         if (!dev_priv) {
 171                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 172                 return DRM_ERR(EINVAL);
 173         }
 174
 175         DRM_COPY_FROM_USER_IOCTL(emit, (drm_radeon_irq_emit_t __user *) data,
 176                                  sizeof(emit));
 177
 178         result = radeon_emit_irq(dev);
 179
 180         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 181                 DRM_ERROR("copy_to_user\n");
 182                 return DRM_ERR(EFAULT);
 183         }
 184
 185         return 0;
 186 }
 187
 188 /* Doesn't need the hardware lock.
 189  */
 190 int radeon_irq_wait(DRM_IOCTL_ARGS)
 191 {
 192         DRM_DEVICE;
 193         drm_radeon_private_t *dev_priv = dev->dev_private;
 194         drm_radeon_irq_wait_t irqwait;
 195
 196         if (!dev_priv) {
 197                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 198                 return DRM_ERR(EINVAL);
 199         }
 200
 201         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_radeon_irq_wait_t __user *) data,
 202                                  sizeof(irqwait));
 203
 204         return radeon_wait_irq(dev, irqwait.irq_seq);
 205 }
 206
 207 /* drm_dma.h hooks
 208 */
 209 void radeon_driver_irq_preinstall(drm_device_t * dev)
 210 {
 211         drm_radeon_private_t *dev_priv =
 212             (drm_radeon_private_t *) dev->dev_private;
 213
 214         /* Disable *all* interrupts */
 215         RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 216
 217         /* Clear bits if they're already high */
 218         radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK |
 219                                            RADEON_CRTC_VBLANK_STAT));
 220 }
 221
 222 void radeon_driver_irq_postinstall(drm_device_t * dev)
 223 {
 224         drm_radeon_private_t *dev_priv =
 225             (drm_radeon_private_t *) dev->dev_private;
 226
 227         atomic_set(&dev_priv->swi_emitted, 0);
 228         DRM_INIT_WAITQUEUE(&dev_priv->swi_queue);
 229
 230         /* Turn on SW and VBL ints */
 231         RADEON_WRITE(RADEON_GEN_INT_CNTL,
 232                      RADEON_CRTC_VBLANK_MASK | RADEON_SW_INT_ENABLE);
 233 }
 234
 235 void radeon_driver_irq_uninstall(drm_device_t * dev)
 236 {
 237         drm_radeon_private_t *dev_priv =
 238             (drm_radeon_private_t *) dev->dev_private;
 239         if (!dev_priv)
 240                 return;
 241
 242         /* Disable *all* interrupts */
 243         RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 244 }