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 <drm/drmP.h>
  29 #include "vmwgfx_drv.h"
  30
  31 #define VMW_FENCE_WRAP (1 << 24)
  32
  33 irqreturn_t vmw_irq_handler(int irq, void *arg)
  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
  66         return (vmw_read(dev_priv, SVGA_REG_BUSY) == 0);
  67 }
  68
  69 void vmw_update_seqno(struct vmw_private *dev_priv,
  70                          struct vmw_fifo_state *fifo_state)
  71 {
  72         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
  73         uint32_t seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
  74
  75         if (dev_priv->last_read_seqno != seqno) {
  76                 dev_priv->last_read_seqno = seqno;
  77                 vmw_marker_pull(&fifo_state->marker_queue, seqno);
  78                 vmw_fences_update(dev_priv->fman);
  79         }
  80 }
  81
  82 bool vmw_seqno_passed(struct vmw_private *dev_priv,
  83                          uint32_t seqno)
  84 {
  85         struct vmw_fifo_state *fifo_state;
  86         bool ret;
  87
  88         if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
  89                 return true;
  90
  91         fifo_state = &dev_priv->fifo;
  92         vmw_update_seqno(dev_priv, fifo_state);
  93         if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
  94                 return true;
  95
  96         if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE) &&
  97             vmw_fifo_idle(dev_priv, seqno))
  98                 return true;
  99
 100         /**
 101          * Then check if the seqno is higher than what we've actually
 102          * emitted. Then the fence is stale and signaled.
 103          */
 104
 105         ret = ((atomic_read(&dev_priv->marker_seq) - seqno)
 106                > VMW_FENCE_WRAP);
 107
 108         return ret;
 109 }
 110
 111 int vmw_fallback_wait(struct vmw_private *dev_priv,
 112                       bool lazy,
 113                       bool fifo_idle,
 114                       uint32_t seqno,
 115                       bool interruptible,
 116                       unsigned long timeout)
 117 {
 118         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 119
 120         uint32_t count = 0;
 121         uint32_t signal_seq;
 122         int ret;
 123         unsigned long end_jiffies = jiffies + timeout;
 124         bool (*wait_condition)(struct vmw_private *, uint32_t);
 125         DEFINE_WAIT(__wait);
 126
 127         wait_condition = (fifo_idle) ? &vmw_fifo_idle :
 128                 &vmw_seqno_passed;
 129
 130         /**
 131          * Block command submission while waiting for idle.
 132          */
 133
 134         if (fifo_idle)
 135                 down_read(&fifo_state->rwsem);
 136         signal_seq = atomic_read(&dev_priv->marker_seq);
 137         ret = 0;
 138
 139         for (;;) {
 140                 prepare_to_wait(&dev_priv->fence_queue, &__wait,
 141                                 (interruptible) ?
 142                                 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
 143                 if (wait_condition(dev_priv, seqno))
 144                         break;
 145                 if (time_after_eq(jiffies, end_jiffies)) {
 146                         DRM_ERROR("SVGA device lockup.\n");
 147                         break;
 148                 }
 149                 if (lazy)
 150                         schedule_timeout(1);
 151                 else if ((++count & 0x0F) == 0) {
 152                         /**
 153                          * FIXME: Use schedule_hr_timeout here for
 154                          * newer kernels and lower CPU utilization.
 155                          */
 156
 157                         __set_current_state(TASK_RUNNING);
 158                         schedule();
 159                         __set_current_state((interruptible) ?
 160                                             TASK_INTERRUPTIBLE :
 161                                             TASK_UNINTERRUPTIBLE);
 162                 }
 163                 if (interruptible && signal_pending(current)) {
 164                         ret = -ERESTARTSYS;
 165                         break;
 166                 }
 167         }
 168         finish_wait(&dev_priv->fence_queue, &__wait);
 169         if (ret == 0 && fifo_idle) {
 170                 __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 171                 iowrite32(signal_seq, fifo_mem + SVGA_FIFO_FENCE);
 172         }
 173         wake_up_all(&dev_priv->fence_queue);
 174         if (fifo_idle)
 175                 up_read(&fifo_state->rwsem);
 176
 177         return ret;
 178 }
 179
 180 void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
 181 {
 182         spin_lock(&dev_priv->waiter_lock);
 183         if (dev_priv->fence_queue_waiters++ == 0) {
 184                 unsigned long irq_flags;
 185
 186                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 187                 outl(SVGA_IRQFLAG_ANY_FENCE,
 188                      dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 189                 dev_priv->irq_mask |= SVGA_IRQFLAG_ANY_FENCE;
 190                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 191                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 192         }
 193         spin_unlock(&dev_priv->waiter_lock);
 194 }
 195
 196 void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
 197 {
 198         spin_lock(&dev_priv->waiter_lock);
 199         if (--dev_priv->fence_queue_waiters == 0) {
 200                 unsigned long irq_flags;
 201
 202                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 203                 dev_priv->irq_mask &= ~SVGA_IRQFLAG_ANY_FENCE;
 204                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 205                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 206         }
 207         spin_unlock(&dev_priv->waiter_lock);
 208 }
 209
 210
 211 void vmw_goal_waiter_add(struct vmw_private *dev_priv)
 212 {
 213         spin_lock(&dev_priv->waiter_lock);
 214         if (dev_priv->goal_queue_waiters++ == 0) {
 215                 unsigned long irq_flags;
 216
 217                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 218                 outl(SVGA_IRQFLAG_FENCE_GOAL,
 219                      dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 220                 dev_priv->irq_mask |= SVGA_IRQFLAG_FENCE_GOAL;
 221                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 222                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 223         }
 224         spin_unlock(&dev_priv->waiter_lock);
 225 }
 226
 227 void vmw_goal_waiter_remove(struct vmw_private *dev_priv)
 228 {
 229         spin_lock(&dev_priv->waiter_lock);
 230         if (--dev_priv->goal_queue_waiters == 0) {
 231                 unsigned long irq_flags;
 232
 233                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 234                 dev_priv->irq_mask &= ~SVGA_IRQFLAG_FENCE_GOAL;
 235                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 236                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 237         }
 238         spin_unlock(&dev_priv->waiter_lock);
 239 }
 240
 241 int vmw_wait_seqno(struct vmw_private *dev_priv,
 242                       bool lazy, uint32_t seqno,
 243                       bool interruptible, unsigned long timeout)
 244 {
 245         long ret;
 246         struct vmw_fifo_state *fifo = &dev_priv->fifo;
 247
 248         if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
 249                 return 0;
 250
 251         if (likely(vmw_seqno_passed(dev_priv, seqno)))
 252                 return 0;
 253
 254         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 255
 256         if (!(fifo->capabilities & SVGA_FIFO_CAP_FENCE))
 257                 return vmw_fallback_wait(dev_priv, lazy, true, seqno,
 258                                          interruptible, timeout);
 259
 260         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 261                 return vmw_fallback_wait(dev_priv, lazy, false, seqno,
 262                                          interruptible, timeout);
 263
 264         vmw_seqno_waiter_add(dev_priv);
 265
 266         if (interruptible)
 267                 ret = wait_event_interruptible_timeout
 268                     (dev_priv->fence_queue,
 269                      vmw_seqno_passed(dev_priv, seqno),
 270                      timeout);
 271         else
 272                 ret = wait_event_timeout
 273                     (dev_priv->fence_queue,
 274                      vmw_seqno_passed(dev_priv, seqno),
 275                      timeout);
 276
 277         vmw_seqno_waiter_remove(dev_priv);
 278
 279         if (unlikely(ret == 0))
 280                 ret = -EBUSY;
 281         else if (likely(ret > 0))
 282                 ret = 0;
 283
 284         return ret;
 285 }
 286
 287 void vmw_irq_preinstall(struct drm_device *dev)
 288 {
 289         struct vmw_private *dev_priv = vmw_priv(dev);
 290         uint32_t status;
 291
 292         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 293                 return;
 294
 295         spin_lock_init(&dev_priv->irq_lock);
 296         status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 297         outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 298 }
 299
 300 int vmw_irq_postinstall(struct drm_device *dev)
 301 {
 302         return 0;
 303 }
 304
 305 void vmw_irq_uninstall(struct drm_device *dev)
 306 {
 307         struct vmw_private *dev_priv = vmw_priv(dev);
 308         uint32_t status;
 309
 310         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 311                 return;
 312
 313         vmw_write(dev_priv, SVGA_REG_IRQMASK, 0);
 314
 315         status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 316         outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 317 }