psb-kernel-source-4.41.1/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 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(I915REG_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 void i915_fence_flush(struct drm_device *dev,
  56                              uint32_t fence_class)
  57 {
  58         struct drm_i915_private *dev_priv =
  59                 (struct drm_i915_private *) dev->dev_private;
  60         struct drm_fence_manager *fm = &dev->fm;
  61         struct drm_fence_class_manager *fc = &fm->fence_class[0];
  62         unsigned long irq_flags;
  63
  64         if (unlikely(!dev_priv))
  65                 return;
  66
  67         write_lock_irqsave(&fm->lock, irq_flags);
  68         i915_initiate_rwflush(dev_priv, fc);
  69         write_unlock_irqrestore(&fm->lock, irq_flags);
  70 }
  71
  72 static void i915_fence_poll(struct drm_device *dev, uint32_t fence_class,
  73                             uint32_t waiting_types)
  74 {
  75         struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
  76         struct drm_fence_manager *fm = &dev->fm;
  77         struct drm_fence_class_manager *fc = &fm->fence_class[0];
  78         uint32_t flush_flags = 0;
  79         uint32_t flush_sequence = 0;
  80         uint32_t i_status;
  81         uint32_t sequence;
  82
  83         if (unlikely(!dev_priv))
  84                 return;
  85
  86         /*
  87          * First, report any executed sync flush:
  88          */
  89
  90         if (dev_priv->flush_pending) {
  91                 i_status = READ_HWSP(dev_priv, 0);
  92                 if ((i_status & (1 << 12)) !=
  93                     (dev_priv->saved_flush_status & (1 << 12))) {
  94                         flush_flags = dev_priv->flush_flags;
  95                         flush_sequence = dev_priv->flush_sequence;
  96                         dev_priv->flush_pending = 0;
  97                         drm_fence_handler(dev, 0, flush_sequence, flush_flags, 0);
  98                 }
  99         }
 100
 101         /*
 102          * Report A new breadcrumb, and adjust IRQs.
 103          */
 104
 105         if (waiting_types & DRM_FENCE_TYPE_EXE) {
 106                 sequence = READ_BREADCRUMB(dev_priv);
 107
 108                 if (sequence != dev_priv->reported_sequence ||
 109                     !dev_priv->reported_sequence_valid) {
 110                         drm_fence_handler(dev, 0, sequence,
 111                                           DRM_FENCE_TYPE_EXE, 0);
 112                         dev_priv->reported_sequence = sequence;
 113                         dev_priv->reported_sequence_valid = 1;
 114                 }
 115
 116                 if (dev_priv->fence_irq_on && !(waiting_types & DRM_FENCE_TYPE_EXE)) {
 117                         i915_user_irq_off(dev_priv);
 118                         dev_priv->fence_irq_on = 0;
 119                 } else if (!dev_priv->fence_irq_on && (waiting_types & DRM_FENCE_TYPE_EXE)) {
 120                         i915_user_irq_on(dev_priv);
 121                         dev_priv->fence_irq_on = 1;
 122                 }
 123         }
 124
 125         /*
 126          * There may be new RW flushes pending. Start them.
 127          */
 128
 129         i915_initiate_rwflush(dev_priv, fc);
 130
 131         /*
 132          * And possibly, but unlikely, they finish immediately.
 133          */
 134
 135         if (dev_priv->flush_pending) {
 136                 i_status = READ_HWSP(dev_priv, 0);
 137                 if (unlikely((i_status & (1 << 12)) !=
 138                     (dev_priv->saved_flush_status & (1 << 12)))) {
 139                         flush_flags = dev_priv->flush_flags;
 140                         flush_sequence = dev_priv->flush_sequence;
 141                         dev_priv->flush_pending = 0;
 142                         drm_fence_handler(dev, 0, flush_sequence, flush_flags, 0);
 143                 }
 144         }
 145 }
 146
 147 static int i915_fence_emit_sequence(struct drm_device *dev, uint32_t class,
 148                              uint32_t flags, uint32_t *sequence,
 149                              uint32_t *native_type)
 150 {
 151         struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
 152         if (unlikely(!dev_priv))
 153                 return -EINVAL;
 154
 155         i915_emit_irq(dev);
 156         *sequence = (uint32_t) dev_priv->counter;
 157         *native_type = DRM_FENCE_TYPE_EXE;
 158         if (flags & DRM_I915_FENCE_FLAG_FLUSHED)
 159                 *native_type |= DRM_I915_FENCE_TYPE_RW;
 160
 161         return 0;
 162 }
 163
 164 void i915_fence_handler(struct drm_device *dev)
 165 {
 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         i915_fence_poll(dev, 0, fc->waiting_types);
 171         write_unlock(&fm->lock);
 172 }
 173
 174 /*
 175  * We need a separate wait function since we need to poll for
 176  * sync flushes.
 177  */
 178
 179 static int i915_fence_wait(struct drm_fence_object *fence,
 180                            int lazy, int interruptible, uint32_t mask)
 181 {
 182         struct drm_device *dev = fence->dev;
 183         struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
 184         struct drm_fence_manager *fm = &dev->fm;
 185         struct drm_fence_class_manager *fc = &fm->fence_class[0];
 186         int ret;
 187         unsigned long  _end = jiffies + 3 * DRM_HZ;
 188
 189         drm_fence_object_flush(fence, mask);
 190         if (likely(interruptible))
 191                 ret = wait_event_interruptible_timeout
 192                         (fc->fence_queue, drm_fence_object_signaled(fence, DRM_FENCE_TYPE_EXE),
 193                          3 * DRM_HZ);
 194         else
 195                 ret = wait_event_timeout
 196                         (fc->fence_queue, drm_fence_object_signaled(fence, DRM_FENCE_TYPE_EXE),
 197                          3 * DRM_HZ);
 198
 199         if (unlikely(ret == -ERESTARTSYS))
 200                 return -EAGAIN;
 201
 202         if (unlikely(ret == 0))
 203                 return -EBUSY;
 204
 205         if (likely(mask == DRM_FENCE_TYPE_EXE ||
 206                    drm_fence_object_signaled(fence, mask)))
 207                 return 0;
 208
 209         /*
 210          * Remove this code snippet when fixed. HWSTAM doesn't let
 211          * flush info through...
 212          */
 213
 214         if (unlikely(dev_priv && !dev_priv->irq_enabled)) {
 215                 unsigned long irq_flags;
 216
 217                 DRM_ERROR("X server disabled IRQs before releasing frame buffer.\n");
 218                 msleep(100);
 219                 dev_priv->flush_pending = 0;
 220                 write_lock_irqsave(&fm->lock, irq_flags);
 221                 drm_fence_handler(dev, fence->fence_class,
 222                                   fence->sequence, fence->type, 0);
 223                 write_unlock_irqrestore(&fm->lock, irq_flags);
 224         }
 225
 226         /*
 227          * Poll for sync flush completion.
 228          */
 229
 230         return drm_fence_wait_polling(fence, lazy, interruptible, mask, _end);
 231 }
 232
 233 static uint32_t i915_fence_needed_flush(struct drm_fence_object *fence)
 234 {
 235         uint32_t flush_flags = fence->waiting_types &
 236                 ~(DRM_FENCE_TYPE_EXE | fence->signaled_types);
 237
 238         if (likely(flush_flags == 0 ||
 239                    ((flush_flags & ~fence->native_types) == 0) ||
 240                    (fence->signaled_types != DRM_FENCE_TYPE_EXE)))
 241                 return 0;
 242         else {
 243                 struct drm_device *dev = fence->dev;
 244                 struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
 245                 struct drm_fence_driver *driver = dev->driver->fence_driver;
 246
 247                 if (unlikely(!dev_priv))
 248                         return 0;
 249
 250                 if (dev_priv->flush_pending) {
 251                         uint32_t diff = (dev_priv->flush_sequence - fence->sequence) &
 252                                 driver->sequence_mask;
 253
 254                         if (diff < driver->wrap_diff)
 255                                 return 0;
 256                 }
 257         }
 258         return flush_flags;
 259 }
 260
 261 /*
 262  * In the very unlikely event that "poll" is not really called very often
 263  * we need the following function to handle sequence wraparounds.
 264  */
 265
 266 void i915_invalidate_reported_sequence(struct drm_device *dev)
 267 {
 268         struct drm_i915_private *dev_priv = (struct drm_i915_private *)
 269                 dev->dev_private;
 270         struct drm_fence_manager *fm = &dev->fm;
 271         unsigned long irq_flags;
 272
 273         if (unlikely(!dev_priv))
 274                 return;
 275
 276         write_lock_irqsave(&fm->lock, irq_flags);
 277         dev_priv->reported_sequence_valid = 0;
 278         write_unlock_irqrestore(&fm->lock, irq_flags);
 279 }
 280
 281
 282 struct drm_fence_driver i915_fence_driver = {
 283         .num_classes = 1,
 284         .wrap_diff = (1U << (BREADCRUMB_BITS - 1)),
 285         .flush_diff = (1U << (BREADCRUMB_BITS - 2)),
 286         .sequence_mask = BREADCRUMB_MASK,
 287         .has_irq = NULL,
 288         .emit = i915_fence_emit_sequence,
 289         .flush = i915_fence_flush,
 290         .poll = i915_fence_poll,
 291         .needed_flush = i915_fence_needed_flush,
 292         .wait = i915_fence_wait,
 293 };