drivers/gpu/drm/vmwgfx/vmwgfx_irq.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2009 VMware, Inc., Palo Alto, CA., 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 above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "drmP.h"
  29 #include "vmwgfx_drv.h"
  30
  31 #define VMW_FENCE_WRAP (1 << 24)
  32
  33 irqreturn_t vmw_irq_handler(DRM_IRQ_ARGS)
  34 {
  35         struct drm_device *dev = (struct drm_device *)arg;
  36         struct vmw_private *dev_priv = vmw_priv(dev);
  37         uint32_t status, masked_status;
  38
  39         spin_lock(&dev_priv->irq_lock);
  40         status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
  41         masked_status = status & dev_priv->irq_mask;
  42         spin_unlock(&dev_priv->irq_lock);
  43
  44         if (likely(status))
  45                 outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
  46
  47         if (!masked_status)
  48                 return IRQ_NONE;
  49
  50         if (masked_status & (SVGA_IRQFLAG_ANY_FENCE |
  51                              SVGA_IRQFLAG_FENCE_GOAL)) {
  52                 vmw_fences_update(dev_priv->fman);
  53                 wake_up_all(&dev_priv->fence_queue);
  54         }
  55
  56         if (masked_status & SVGA_IRQFLAG_FIFO_PROGRESS)
  57                 wake_up_all(&dev_priv->fifo_queue);
  58
  59
  60         return IRQ_HANDLED;
  61 }
  62
  63 static bool vmw_fifo_idle(struct vmw_private *dev_priv, uint32_t seqno)
  64 {
  65         uint32_t busy;
  66
  67         mutex_lock(&dev_priv->hw_mutex);
  68         busy = vmw_read(dev_priv, SVGA_REG_BUSY);
  69         mutex_unlock(&dev_priv->hw_mutex);
  70
  71         return (busy == 0);
  72 }
  73
  74 void vmw_update_seqno(struct vmw_private *dev_priv,
  75                          struct vmw_fifo_state *fifo_state)
  76 {
  77         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
  78         uint32_t seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
  79
  80         if (dev_priv->last_read_seqno != seqno) {
  81                 dev_priv->last_read_seqno = seqno;
  82                 vmw_marker_pull(&fifo_state->marker_queue, seqno);
  83                 vmw_fences_update(dev_priv->fman);
  84         }
  85 }
  86
  87 bool vmw_seqno_passed(struct vmw_private *dev_priv,
  88                          uint32_t seqno)
  89 {
  90         struct vmw_fifo_state *fifo_state;
  91         bool ret;
  92
  93         if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
  94                 return true;
  95
  96         fifo_state = &dev_priv->fifo;
  97         vmw_update_seqno(dev_priv, fifo_state);
  98         if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
  99                 return true;
 100
 101         if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE) &&
 102             vmw_fifo_idle(dev_priv, seqno))
 103                 return true;
 104
 105         /**
 106          * Then check if the seqno is higher than what we've actually
 107          * emitted. Then the fence is stale and signaled.
 108          */
 109
 110         ret = ((atomic_read(&dev_priv->marker_seq) - seqno)
 111                > VMW_FENCE_WRAP);
 112
 113         return ret;
 114 }
 115
 116 int vmw_fallback_wait(struct vmw_private *dev_priv,
 117                       bool lazy,
 118                       bool fifo_idle,
 119                       uint32_t seqno,
 120                       bool interruptible,
 121                       unsigned long timeout)
 122 {
 123         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 124
 125         uint32_t count = 0;
 126         uint32_t signal_seq;
 127         int ret;
 128         unsigned long end_jiffies = jiffies + timeout;
 129         bool (*wait_condition)(struct vmw_private *, uint32_t);
 130         DEFINE_WAIT(__wait);
 131
 132         wait_condition = (fifo_idle) ? &vmw_fifo_idle :
 133                 &vmw_seqno_passed;
 134
 135         /**
 136          * Block command submission while waiting for idle.
 137          */
 138
 139         if (fifo_idle)
 140                 down_read(&fifo_state->rwsem);
 141         signal_seq = atomic_read(&dev_priv->marker_seq);
 142         ret = 0;
 143
 144         for (;;) {
 145                 prepare_to_wait(&dev_priv->fence_queue, &__wait,
 146                                 (interruptible) ?
 147                                 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
 148                 if (wait_condition(dev_priv, seqno))
 149                         break;
 150                 if (time_after_eq(jiffies, end_jiffies)) {
 151                         DRM_ERROR("SVGA device lockup.\n");
 152                         break;
 153                 }
 154                 if (lazy)
 155                         schedule_timeout(1);
 156                 else if ((++count & 0x0F) == 0) {
 157                         /**
 158                          * FIXME: Use schedule_hr_timeout here for
 159                          * newer kernels and lower CPU utilization.
 160                          */
 161
 162                         __set_current_state(TASK_RUNNING);
 163                         schedule();
 164                         __set_current_state((interruptible) ?
 165                                             TASK_INTERRUPTIBLE :
 166                                             TASK_UNINTERRUPTIBLE);
 167                 }
 168                 if (interruptible && signal_pending(current)) {
 169                         ret = -ERESTARTSYS;
 170                         break;
 171                 }
 172         }
 173         finish_wait(&dev_priv->fence_queue, &__wait);
 174         if (ret == 0 && fifo_idle) {
 175                 __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 176                 iowrite32(signal_seq, fifo_mem + SVGA_FIFO_FENCE);
 177         }
 178         wake_up_all(&dev_priv->fence_queue);
 179         if (fifo_idle)
 180                 up_read(&fifo_state->rwsem);
 181
 182         return ret;
 183 }
 184
 185 void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
 186 {
 187         mutex_lock(&dev_priv->hw_mutex);
 188         if (dev_priv->fence_queue_waiters++ == 0) {
 189                 unsigned long irq_flags;
 190
 191                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 192                 outl(SVGA_IRQFLAG_ANY_FENCE,
 193                      dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 194                 dev_priv->irq_mask |= SVGA_IRQFLAG_ANY_FENCE;
 195                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 196                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 197         }
 198         mutex_unlock(&dev_priv->hw_mutex);
 199 }
 200
 201 void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
 202 {
 203         mutex_lock(&dev_priv->hw_mutex);
 204         if (--dev_priv->fence_queue_waiters == 0) {
 205                 unsigned long irq_flags;
 206
 207                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 208                 dev_priv->irq_mask &= ~SVGA_IRQFLAG_ANY_FENCE;
 209                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 210                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 211         }
 212         mutex_unlock(&dev_priv->hw_mutex);
 213 }
 214
 215
 216 void vmw_goal_waiter_add(struct vmw_private *dev_priv)
 217 {
 218         mutex_lock(&dev_priv->hw_mutex);
 219         if (dev_priv->goal_queue_waiters++ == 0) {
 220                 unsigned long irq_flags;
 221
 222                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 223                 outl(SVGA_IRQFLAG_FENCE_GOAL,
 224                      dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 225                 dev_priv->irq_mask |= SVGA_IRQFLAG_FENCE_GOAL;
 226                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 227                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 228         }
 229         mutex_unlock(&dev_priv->hw_mutex);
 230 }
 231
 232 void vmw_goal_waiter_remove(struct vmw_private *dev_priv)
 233 {
 234         mutex_lock(&dev_priv->hw_mutex);
 235         if (--dev_priv->goal_queue_waiters == 0) {
 236                 unsigned long irq_flags;
 237
 238                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 239                 dev_priv->irq_mask &= ~SVGA_IRQFLAG_FENCE_GOAL;
 240                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 241                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 242         }
 243         mutex_unlock(&dev_priv->hw_mutex);
 244 }
 245
 246 int vmw_wait_seqno(struct vmw_private *dev_priv,
 247                       bool lazy, uint32_t seqno,
 248                       bool interruptible, unsigned long timeout)
 249 {
 250         long ret;
 251         struct vmw_fifo_state *fifo = &dev_priv->fifo;
 252
 253         if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
 254                 return 0;
 255
 256         if (likely(vmw_seqno_passed(dev_priv, seqno)))
 257                 return 0;
 258
 259         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 260
 261         if (!(fifo->capabilities & SVGA_FIFO_CAP_FENCE))
 262                 return vmw_fallback_wait(dev_priv, lazy, true, seqno,
 263                                          interruptible, timeout);
 264
 265         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 266                 return vmw_fallback_wait(dev_priv, lazy, false, seqno,
 267                                          interruptible, timeout);
 268
 269         vmw_seqno_waiter_add(dev_priv);
 270
 271         if (interruptible)
 272                 ret = wait_event_interruptible_timeout
 273                     (dev_priv->fence_queue,
 274                      vmw_seqno_passed(dev_priv, seqno),
 275                      timeout);
 276         else
 277                 ret = wait_event_timeout
 278                     (dev_priv->fence_queue,
 279                      vmw_seqno_passed(dev_priv, seqno),
 280                      timeout);
 281
 282         vmw_seqno_waiter_remove(dev_priv);
 283
 284         if (unlikely(ret == 0))
 285                 ret = -EBUSY;
 286         else if (likely(ret > 0))
 287                 ret = 0;
 288
 289         return ret;
 290 }
 291
 292 void vmw_irq_preinstall(struct drm_device *dev)
 293 {
 294         struct vmw_private *dev_priv = vmw_priv(dev);
 295         uint32_t status;
 296
 297         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 298                 return;
 299
 300         spin_lock_init(&dev_priv->irq_lock);
 301         status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 302         outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 303 }
 304
 305 int vmw_irq_postinstall(struct drm_device *dev)
 306 {
 307         return 0;
 308 }
 309
 310 void vmw_irq_uninstall(struct drm_device *dev)
 311 {
 312         struct vmw_private *dev_priv = vmw_priv(dev);
 313         uint32_t status;
 314
 315         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 316                 return;
 317
 318         mutex_lock(&dev_priv->hw_mutex);
 319         vmw_write(dev_priv, SVGA_REG_IRQMASK, 0);
 320         mutex_unlock(&dev_priv->hw_mutex);
 321
 322         status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 323         outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 324 }