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   1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
   2  */
   3 /*
   4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  */
  28
  29 #include "drmP.h"
  30 #include "drm.h"
  31 #include "i915_drm.h"
  32 #include "i915_drv.h"
  33
  34 #define USER_INT_FLAG (1<<1)
  35 #define VSYNC_PIPEB_FLAG (1<<5)
  36 #define VSYNC_PIPEA_FLAG (1<<7)
  37
  38 #define MAX_NOPID ((u32)~0)
  39
  40 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
  41 {
  42         drm_device_t *dev = (drm_device_t *) arg;
  43         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  44         u16 temp;
  45
  46         temp = I915_READ16(I915REG_INT_IDENTITY_R);
  47
  48         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
  49
  50         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
  51
  52         if (temp == 0)
  53                 return IRQ_NONE;
  54
  55         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
  56
  57         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
  58
  59         if (temp & USER_INT_FLAG)
  60                 DRM_WAKEUP(&dev_priv->irq_queue);
  61
  62         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
  63                 atomic_inc(&dev->vbl_received);
  64                 DRM_WAKEUP(&dev->vbl_queue);
  65                 drm_vbl_send_signals(dev);
  66         }
  67
  68         return IRQ_HANDLED;
  69 }
  70
  71 static int i915_emit_irq(drm_device_t * dev)
  72 {
  73         drm_i915_private_t *dev_priv = dev->dev_private;
  74         RING_LOCALS;
  75
  76         i915_kernel_lost_context(dev);
  77
  78         DRM_DEBUG("%s\n", __FUNCTION__);
  79
  80         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
  81
  82         if (dev_priv->counter > 0x7FFFFFFFUL)
  83                 dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
  84
  85         BEGIN_LP_RING(6);
  86         OUT_RING(CMD_STORE_DWORD_IDX);
  87         OUT_RING(20);
  88         OUT_RING(dev_priv->counter);
  89         OUT_RING(0);
  90         OUT_RING(0);
  91         OUT_RING(GFX_OP_USER_INTERRUPT);
  92         ADVANCE_LP_RING();
  93
  94         return dev_priv->counter;
  95 }
  96
  97 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
  98 {
  99         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 100         int ret = 0;
 101
 102         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
 103                   READ_BREADCRUMB(dev_priv));
 104
 105         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 106                 return 0;
 107
 108         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 109
 110         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 111                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 112
 113         if (ret == DRM_ERR(EBUSY)) {
 114                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
 115                           __FUNCTION__,
 116                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 117         }
 118
 119         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 120         return ret;
 121 }
 122
 123 int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 124 {
 125         drm_i915_private_t *dev_priv = dev->dev_private;
 126         unsigned int cur_vblank;
 127         int ret = 0;
 128
 129         if (!dev_priv) {
 130                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 131                 return DRM_ERR(EINVAL);
 132         }
 133
 134         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 135                     (((cur_vblank = atomic_read(&dev->vbl_received))
 136                         - *sequence) <= (1<<23)));
 137
 138         *sequence = cur_vblank;
 139
 140         return ret;
 141 }
 142
 143
 144 /* Needs the lock as it touches the ring.
 145  */
 146 int i915_irq_emit(DRM_IOCTL_ARGS)
 147 {
 148         DRM_DEVICE;
 149         drm_i915_private_t *dev_priv = dev->dev_private;
 150         drm_i915_irq_emit_t emit;
 151         int result;
 152
 153         LOCK_TEST_WITH_RETURN(dev, filp);
 154
 155         if (!dev_priv) {
 156                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 157                 return DRM_ERR(EINVAL);
 158         }
 159
 160         DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
 161                                  sizeof(emit));
 162
 163         result = i915_emit_irq(dev);
 164
 165         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 166                 DRM_ERROR("copy_to_user\n");
 167                 return DRM_ERR(EFAULT);
 168         }
 169
 170         return 0;
 171 }
 172
 173 /* Doesn't need the hardware lock.
 174  */
 175 int i915_irq_wait(DRM_IOCTL_ARGS)
 176 {
 177         DRM_DEVICE;
 178         drm_i915_private_t *dev_priv = dev->dev_private;
 179         drm_i915_irq_wait_t irqwait;
 180
 181         if (!dev_priv) {
 182                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 183                 return DRM_ERR(EINVAL);
 184         }
 185
 186         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
 187                                  sizeof(irqwait));
 188
 189         return i915_wait_irq(dev, irqwait.irq_seq);
 190 }
 191
 192 static int i915_enable_interrupt (drm_device_t *dev)
 193 {
 194         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 195         u16 flag;
 196
 197         flag = 0;
 198         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 199                 flag |= VSYNC_PIPEA_FLAG;
 200         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 201                 flag |= VSYNC_PIPEB_FLAG;
 202         if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 203                 DRM_ERROR("%s called with invalid pipe 0x%x\n",
 204                           __FUNCTION__, dev_priv->vblank_pipe);
 205                 return DRM_ERR(EINVAL);
 206         }
 207         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
 208         return 0;
 209 }
 210
 211 /* Set the vblank monitor pipe
 212  */
 213 int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
 214 {
 215         DRM_DEVICE;
 216         drm_i915_private_t *dev_priv = dev->dev_private;
 217         drm_i915_vblank_pipe_t pipe;
 218
 219         if (!dev_priv) {
 220                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 221                 return DRM_ERR(EINVAL);
 222         }
 223
 224         DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
 225                                  sizeof(pipe));
 226
 227         dev_priv->vblank_pipe = pipe.pipe;
 228         return i915_enable_interrupt (dev);
 229 }
 230
 231 int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
 232 {
 233         DRM_DEVICE;
 234         drm_i915_private_t *dev_priv = dev->dev_private;
 235         drm_i915_vblank_pipe_t pipe;
 236         u16 flag;
 237
 238         if (!dev_priv) {
 239                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 240                 return DRM_ERR(EINVAL);
 241         }
 242
 243         flag = I915_READ(I915REG_INT_ENABLE_R);
 244         pipe.pipe = 0;
 245         if (flag & VSYNC_PIPEA_FLAG)
 246                 pipe.pipe |= DRM_I915_VBLANK_PIPE_A;
 247         if (flag & VSYNC_PIPEB_FLAG)
 248                 pipe.pipe |= DRM_I915_VBLANK_PIPE_B;
 249         DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
 250                                  sizeof(pipe));
 251         return 0;
 252 }
 253
 254 /* drm_dma.h hooks
 255 */
 256 void i915_driver_irq_preinstall(drm_device_t * dev)
 257 {
 258         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 259
 260         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 261         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 262         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 263 }
 264
 265 void i915_driver_irq_postinstall(drm_device_t * dev)
 266 {
 267         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 268
 269         i915_enable_interrupt(dev);
 270         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 271 }
 272
 273 void i915_driver_irq_uninstall(drm_device_t * dev)
 274 {
 275         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 276         u16 temp;
 277
 278         if (!dev_priv)
 279                 return;
 280
 281         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 282         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 283         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 284
 285         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 286         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 287 }