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 Dänzer <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         struct drm_device *dev = (struct drm_device *) 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                                                   RADEON_CRTC2_VBLANK_STAT));
  78         if (!stat)
  79                 return IRQ_NONE;
  80
  81         stat &= dev_priv->irq_enable_reg;
  82
  83         /* SW interrupt */
  84         if (stat & RADEON_SW_INT_TEST) {
  85                 DRM_WAKEUP(&dev_priv->swi_queue);
  86         }
  87
  88         /* VBLANK interrupt */
  89         if (stat & (RADEON_CRTC_VBLANK_STAT|RADEON_CRTC2_VBLANK_STAT)) {
  90                 int vblank_crtc = dev_priv->vblank_crtc;
  91
  92                 if ((vblank_crtc &
  93                      (DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) ==
  94                     (DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) {
  95                         if (stat & RADEON_CRTC_VBLANK_STAT)
  96                                 atomic_inc(&dev->vbl_received);
  97                         if (stat & RADEON_CRTC2_VBLANK_STAT)
  98                                 atomic_inc(&dev->vbl_received2);
  99                 } else if (((stat & RADEON_CRTC_VBLANK_STAT) &&
 100                            (vblank_crtc & DRM_RADEON_VBLANK_CRTC1)) ||
 101                            ((stat & RADEON_CRTC2_VBLANK_STAT) &&
 102                             (vblank_crtc & DRM_RADEON_VBLANK_CRTC2)))
 103                         atomic_inc(&dev->vbl_received);
 104
 105                 DRM_WAKEUP(&dev->vbl_queue);
 106                 drm_vbl_send_signals(dev);
 107         }
 108
 109         return IRQ_HANDLED;
 110 }
 111
 112 static int radeon_emit_irq(struct drm_device * dev)
 113 {
 114         drm_radeon_private_t *dev_priv = dev->dev_private;
 115         unsigned int ret;
 116         RING_LOCALS;
 117
 118         atomic_inc(&dev_priv->swi_emitted);
 119         ret = atomic_read(&dev_priv->swi_emitted);
 120
 121         BEGIN_RING(4);
 122         OUT_RING_REG(RADEON_LAST_SWI_REG, ret);
 123         OUT_RING_REG(RADEON_GEN_INT_STATUS, RADEON_SW_INT_FIRE);
 124         ADVANCE_RING();
 125         COMMIT_RING();
 126
 127         return ret;
 128 }
 129
 130 static int radeon_wait_irq(struct drm_device * dev, int swi_nr)
 131 {
 132         drm_radeon_private_t *dev_priv =
 133             (drm_radeon_private_t *) dev->dev_private;
 134         int ret = 0;
 135
 136         if (RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr)
 137                 return 0;
 138
 139         dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
 140
 141         DRM_WAIT_ON(ret, dev_priv->swi_queue, 3 * DRM_HZ,
 142                     RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr);
 143
 144         return ret;
 145 }
 146
 147 static int radeon_driver_vblank_do_wait(struct drm_device * dev,
 148                                         unsigned int *sequence, int crtc)
 149 {
 150         drm_radeon_private_t *dev_priv =
 151             (drm_radeon_private_t *) dev->dev_private;
 152         unsigned int cur_vblank;
 153         int ret = 0;
 154         int ack = 0;
 155         atomic_t *counter;
 156         if (!dev_priv) {
 157                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 158                 return -EINVAL;
 159         }
 160
 161         if (crtc == DRM_RADEON_VBLANK_CRTC1) {
 162                 counter = &dev->vbl_received;
 163                 ack |= RADEON_CRTC_VBLANK_STAT;
 164         } else if (crtc == DRM_RADEON_VBLANK_CRTC2) {
 165                 counter = &dev->vbl_received2;
 166                 ack |= RADEON_CRTC2_VBLANK_STAT;
 167         } else
 168                 return -EINVAL;
 169
 170         radeon_acknowledge_irqs(dev_priv, ack);
 171
 172         dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
 173
 174         /* Assume that the user has missed the current sequence number
 175          * by about a day rather than she wants to wait for years
 176          * using vertical blanks...
 177          */
 178         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 179                     (((cur_vblank = atomic_read(counter))
 180                       - *sequence) <= (1 << 23)));
 181
 182         *sequence = cur_vblank;
 183
 184         return ret;
 185 }
 186
 187 int radeon_driver_vblank_wait(struct drm_device *dev, unsigned int *sequence)
 188 {
 189         return radeon_driver_vblank_do_wait(dev, sequence, DRM_RADEON_VBLANK_CRTC1);
 190 }
 191
 192 int radeon_driver_vblank_wait2(struct drm_device *dev, unsigned int *sequence)
 193 {
 194         return radeon_driver_vblank_do_wait(dev, sequence, DRM_RADEON_VBLANK_CRTC2);
 195 }
 196
 197 /* Needs the lock as it touches the ring.
 198  */
 199 int radeon_irq_emit(struct drm_device *dev, void *data, struct drm_file *file_priv)
 200 {
 201         drm_radeon_private_t *dev_priv = dev->dev_private;
 202         drm_radeon_irq_emit_t *emit = data;
 203         int result;
 204
 205         LOCK_TEST_WITH_RETURN(dev, file_priv);
 206
 207         if (!dev_priv) {
 208                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 209                 return -EINVAL;
 210         }
 211
 212         result = radeon_emit_irq(dev);
 213
 214         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 215                 DRM_ERROR("copy_to_user\n");
 216                 return -EFAULT;
 217         }
 218
 219         return 0;
 220 }
 221
 222 /* Doesn't need the hardware lock.
 223  */
 224 int radeon_irq_wait(struct drm_device *dev, void *data, struct drm_file *file_priv)
 225 {
 226         drm_radeon_private_t *dev_priv = dev->dev_private;
 227         drm_radeon_irq_wait_t *irqwait = data;
 228
 229         if (!dev_priv) {
 230                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 231                 return -EINVAL;
 232         }
 233
 234         return radeon_wait_irq(dev, irqwait->irq_seq);
 235 }
 236
 237 static void radeon_enable_interrupt(struct drm_device *dev)
 238 {
 239         drm_radeon_private_t *dev_priv = (drm_radeon_private_t *) dev->dev_private;
 240
 241         dev_priv->irq_enable_reg = RADEON_SW_INT_ENABLE;
 242         if (dev_priv->vblank_crtc & DRM_RADEON_VBLANK_CRTC1)
 243                 dev_priv->irq_enable_reg |= RADEON_CRTC_VBLANK_MASK;
 244
 245         if (dev_priv->vblank_crtc & DRM_RADEON_VBLANK_CRTC2)
 246                 dev_priv->irq_enable_reg |= RADEON_CRTC2_VBLANK_MASK;
 247
 248         RADEON_WRITE(RADEON_GEN_INT_CNTL, dev_priv->irq_enable_reg);
 249         dev_priv->irq_enabled = 1;
 250 }
 251
 252 /* drm_dma.h hooks
 253 */
 254 void radeon_driver_irq_preinstall(struct drm_device * dev)
 255 {
 256         drm_radeon_private_t *dev_priv =
 257             (drm_radeon_private_t *) dev->dev_private;
 258
 259         /* Disable *all* interrupts */
 260         RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 261
 262         /* Clear bits if they're already high */
 263         radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK |
 264                                            RADEON_CRTC_VBLANK_STAT |
 265                                            RADEON_CRTC2_VBLANK_STAT));
 266 }
 267
 268 void radeon_driver_irq_postinstall(struct drm_device * dev)
 269 {
 270         drm_radeon_private_t *dev_priv =
 271             (drm_radeon_private_t *) dev->dev_private;
 272
 273         atomic_set(&dev_priv->swi_emitted, 0);
 274         DRM_INIT_WAITQUEUE(&dev_priv->swi_queue);
 275
 276         radeon_enable_interrupt(dev);
 277 }
 278
 279 void radeon_driver_irq_uninstall(struct drm_device * dev)
 280 {
 281         drm_radeon_private_t *dev_priv =
 282             (drm_radeon_private_t *) dev->dev_private;
 283         if (!dev_priv)
 284                 return;
 285
 286         dev_priv->irq_enabled = 0;
 287
 288         /* Disable *all* interrupts */
 289         RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 290 }
 291
 292
 293 int radeon_vblank_crtc_get(struct drm_device *dev)
 294 {
 295         drm_radeon_private_t *dev_priv = (drm_radeon_private_t *) dev->dev_private;
 296         u32 flag;
 297         u32 value;
 298
 299         flag = RADEON_READ(RADEON_GEN_INT_CNTL);
 300         value = 0;
 301
 302         if (flag & RADEON_CRTC_VBLANK_MASK)
 303                 value |= DRM_RADEON_VBLANK_CRTC1;
 304
 305         if (flag & RADEON_CRTC2_VBLANK_MASK)
 306                 value |= DRM_RADEON_VBLANK_CRTC2;
 307         return value;
 308 }
 309
 310 int radeon_vblank_crtc_set(struct drm_device *dev, int64_t value)
 311 {
 312         drm_radeon_private_t *dev_priv = (drm_radeon_private_t *) dev->dev_private;
 313         if (value & ~(DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) {
 314                 DRM_ERROR("called with invalid crtc 0x%x\n", (unsigned int)value);
 315                 return -EINVAL;
 316         }
 317         dev_priv->vblank_crtc = (unsigned int)value;
 318         radeon_enable_interrupt(dev);
 319         return 0;
 320 }