linux-core/i915_fence.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  30  */
  31
  32 #include "drmP.h"
  33 #include "drm.h"
  34 #include "i915_drm.h"
  35 #include "i915_drv.h"
  36
  37 /*
  38  * Initiate a sync flush if it's not already pending.
  39  */
  40
  41 static inline void i915_initiate_rwflush(struct drm_i915_private *dev_priv,
  42                                          struct drm_fence_class_manager *fc)
  43 {
  44         if ((fc->pending_flush & DRM_I915_FENCE_TYPE_RW) &&
  45             !dev_priv->flush_pending) {
  46                 dev_priv->flush_sequence = (uint32_t) READ_BREADCRUMB(dev_priv);
  47                 dev_priv->flush_flags = fc->pending_flush;
  48                 dev_priv->saved_flush_status = READ_HWSP(dev_priv, 0);
  49                 I915_WRITE(INSTPM, (1 << 5) | (1 << 21));
  50                 dev_priv->flush_pending = 1;
  51                 fc->pending_flush &= ~DRM_I915_FENCE_TYPE_RW;
  52         }
  53 }
  54
  55 static inline void i915_report_rwflush(struct drm_device *dev,
  56                                        struct drm_i915_private *dev_priv)
  57 {
  58         if (unlikely(dev_priv->flush_pending)) {
  59
  60                 uint32_t flush_flags;
  61                 uint32_t i_status;
  62                 uint32_t flush_sequence;
  63
  64                 i_status = READ_HWSP(dev_priv, 0);
  65                 if ((i_status & (1 << 12)) !=
  66                     (dev_priv->saved_flush_status & (1 << 12))) {
  67                         flush_flags = dev_priv->flush_flags;
  68                         flush_sequence = dev_priv->flush_sequence;
  69                         dev_priv->flush_pending = 0;
  70                         drm_fence_handler(dev, 0, flush_sequence,
  71                                           flush_flags, 0);
  72                 }
  73         }
  74 }
  75
  76 static void i915_fence_flush(struct drm_device *dev,
  77                              uint32_t fence_class)
  78 {
  79         struct drm_i915_private *dev_priv =
  80                 (struct drm_i915_private *) dev->dev_private;
  81         struct drm_fence_manager *fm = &dev->fm;
  82         struct drm_fence_class_manager *fc = &fm->fence_class[0];
  83         unsigned long irq_flags;
  84
  85         if (unlikely(!dev_priv))
  86                 return;
  87
  88         write_lock_irqsave(&fm->lock, irq_flags);
  89         i915_initiate_rwflush(dev_priv, fc);
  90         write_unlock_irqrestore(&fm->lock, irq_flags);
  91 }
  92
  93
  94 static void i915_fence_poll(struct drm_device *dev, uint32_t fence_class,
  95                             uint32_t waiting_types)
  96 {
  97         struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
  98         struct drm_fence_manager *fm = &dev->fm;
  99         struct drm_fence_class_manager *fc = &fm->fence_class[0];
 100         uint32_t sequence;
 101
 102         if (unlikely(!dev_priv))
 103                 return;
 104
 105         /*
 106          * First, report any executed sync flush:
 107          */
 108
 109         i915_report_rwflush(dev, dev_priv);
 110
 111         /*
 112          * Report A new breadcrumb, and adjust IRQs.
 113          */
 114
 115         if (waiting_types & DRM_FENCE_TYPE_EXE) {
 116
 117                 sequence = READ_BREADCRUMB(dev_priv);
 118                 drm_fence_handler(dev, 0, sequence,
 119                                   DRM_FENCE_TYPE_EXE, 0);
 120
 121                 if (dev_priv->fence_irq_on &&
 122                     !(fc->waiting_types & DRM_FENCE_TYPE_EXE)) {
 123                         i915_user_irq_off(dev);
 124                         dev_priv->fence_irq_on = 0;
 125                 } else if (!dev_priv->fence_irq_on &&
 126                            (fc->waiting_types & DRM_FENCE_TYPE_EXE)) {
 127                         i915_user_irq_on(dev);
 128                         dev_priv->fence_irq_on = 1;
 129                 }
 130         }
 131
 132         /*
 133          * There may be new RW flushes pending. Start them.
 134          */
 135
 136         i915_initiate_rwflush(dev_priv, fc);
 137
 138         /*
 139          * And possibly, but unlikely, they finish immediately.
 140          */
 141
 142         i915_report_rwflush(dev, dev_priv);
 143
 144 }
 145
 146 static int i915_fence_emit_sequence(struct drm_device *dev, uint32_t class,
 147                              uint32_t flags, uint32_t *sequence,
 148                              uint32_t *native_type)
 149 {
 150         struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
 151         if (unlikely(!dev_priv))
 152                 return -EINVAL;
 153
 154         i915_emit_irq(dev);
 155         *sequence = (uint32_t) dev_priv->counter;
 156         *native_type = DRM_FENCE_TYPE_EXE;
 157         if (flags & DRM_I915_FENCE_FLAG_FLUSHED)
 158                 *native_type |= DRM_I915_FENCE_TYPE_RW;
 159
 160         return 0;
 161 }
 162
 163 void i915_fence_handler(struct drm_device *dev)
 164 {
 165         struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
 166         struct drm_fence_manager *fm = &dev->fm;
 167         struct drm_fence_class_manager *fc = &fm->fence_class[0];
 168
 169         write_lock(&fm->lock);
 170         if (likely(dev_priv->fence_irq_on))
 171                 i915_fence_poll(dev, 0, fc->waiting_types);
 172         write_unlock(&fm->lock);
 173 }
 174
 175 /*
 176  * We need a separate wait function since we need to poll for
 177  * sync flushes.
 178  */
 179
 180 static int i915_fence_wait(struct drm_fence_object *fence,
 181                            int lazy, int interruptible, uint32_t mask)
 182 {
 183         struct drm_device *dev = fence->dev;
 184         struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
 185         struct drm_fence_manager *fm = &dev->fm;
 186         struct drm_fence_class_manager *fc = &fm->fence_class[0];
 187         int ret;
 188         unsigned long  _end = jiffies + 3 * DRM_HZ;
 189
 190         drm_fence_object_flush(fence, mask);
 191         if (likely(interruptible))
 192                 ret = wait_event_interruptible_timeout
 193                         (fc->fence_queue, drm_fence_object_signaled(fence, DRM_FENCE_TYPE_EXE),
 194                          3 * DRM_HZ);
 195         else
 196                 ret = wait_event_timeout
 197                         (fc->fence_queue, drm_fence_object_signaled(fence, DRM_FENCE_TYPE_EXE),
 198                          3 * DRM_HZ);
 199
 200         if (unlikely(ret == -ERESTARTSYS))
 201                 return -EAGAIN;
 202
 203         if (unlikely(ret == 0))
 204                 return -EBUSY;
 205
 206         if (likely(mask == DRM_FENCE_TYPE_EXE ||
 207                    drm_fence_object_signaled(fence, mask)))
 208                 return 0;
 209
 210         /*
 211          * Remove this code snippet when fixed. HWSTAM doesn't let
 212          * flush info through...
 213          */
 214
 215         if (unlikely(dev_priv && !dev_priv->irq_enabled)) {
 216                 unsigned long irq_flags;
 217
 218                 DRM_ERROR("X server disabled IRQs before releasing frame buffer.\n");
 219                 msleep(100);
 220                 dev_priv->flush_pending = 0;
 221                 write_lock_irqsave(&fm->lock, irq_flags);
 222                 drm_fence_handler(dev, fence->fence_class,
 223                                   fence->sequence, fence->type, 0);
 224                 write_unlock_irqrestore(&fm->lock, irq_flags);
 225         }
 226
 227         /*
 228          * Poll for sync flush completion.
 229          */
 230
 231         return drm_fence_wait_polling(fence, lazy, interruptible, mask, _end);
 232 }
 233
 234 static uint32_t i915_fence_needed_flush(struct drm_fence_object *fence)
 235 {
 236         uint32_t flush_flags = fence->waiting_types &
 237                 ~(DRM_FENCE_TYPE_EXE | fence->signaled_types);
 238
 239         if (likely(flush_flags == 0 ||
 240                    ((flush_flags & ~fence->native_types) == 0) ||
 241                    (fence->signaled_types != DRM_FENCE_TYPE_EXE)))
 242                 return 0;
 243         else {
 244                 struct drm_device *dev = fence->dev;
 245                 struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
 246                 struct drm_fence_driver *driver = dev->driver->fence_driver;
 247
 248                 if (unlikely(!dev_priv))
 249                         return 0;
 250
 251                 if (dev_priv->flush_pending) {
 252                         uint32_t diff = (dev_priv->flush_sequence - fence->sequence) &
 253                                 driver->sequence_mask;
 254
 255                         if (diff < driver->wrap_diff)
 256                                 return 0;
 257                 }
 258         }
 259         return flush_flags;
 260 }
 261
 262 struct drm_fence_driver i915_fence_driver = {
 263         .num_classes = 1,
 264         .wrap_diff = (1U << (BREADCRUMB_BITS - 1)),
 265         .flush_diff = (1U << (BREADCRUMB_BITS - 2)),
 266         .sequence_mask = BREADCRUMB_MASK,
 267         .has_irq = NULL,
 268         .emit = i915_fence_emit_sequence,
 269         .flush = i915_fence_flush,
 270         .poll = i915_fence_poll,
 271         .needed_flush = i915_fence_needed_flush,
 272         .wait = i915_fence_wait,
 273 };