6/sys/dev/drm/i915_irq.c

   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 <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include "dev/drm/drmP.h"
  33 #include "dev/drm/drm.h"
  34 #include "dev/drm/i915_drm.h"
  35 #include "dev/drm/i915_drv.h"
  36
  37 #define USER_INT_FLAG (1<<1)
  38 #define VSYNC_PIPEB_FLAG (1<<5)
  39 #define VSYNC_PIPEA_FLAG (1<<7)
  40
  41 #define MAX_NOPID ((u32)~0)
  42
  43 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
  44 {
  45         drm_device_t *dev = (drm_device_t *) arg;
  46         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  47         u16 temp;
  48
  49         temp = I915_READ16(I915REG_INT_IDENTITY_R);
  50
  51         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
  52
  53         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
  54
  55         if (temp == 0)
  56                 return IRQ_NONE;
  57
  58         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
  59
  60         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
  61
  62         if (temp & USER_INT_FLAG)
  63                 DRM_WAKEUP(&dev_priv->irq_queue);
  64
  65         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
  66                 atomic_inc(&dev->vbl_received);
  67                 DRM_WAKEUP(&dev->vbl_queue);
  68                 drm_vbl_send_signals(dev);
  69         }
  70
  71         return IRQ_HANDLED;
  72 }
  73
  74 static int i915_emit_irq(drm_device_t * dev)
  75 {
  76
  77         drm_i915_private_t *dev_priv = dev->dev_private;
  78         RING_LOCALS;
  79
  80         i915_kernel_lost_context(dev);
  81
  82         DRM_DEBUG("%s\n", __FUNCTION__);
  83
  84         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
  85
  86         if (dev_priv->counter > 0x7FFFFFFFUL)
  87                  dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
  88
  89         BEGIN_LP_RING(6);
  90         OUT_RING(CMD_STORE_DWORD_IDX);
  91         OUT_RING(20);
  92         OUT_RING(dev_priv->counter);
  93
  94         OUT_RING(0);
  95         OUT_RING(0);
  96         OUT_RING(GFX_OP_USER_INTERRUPT);
  97         ADVANCE_LP_RING();
  98
  99         return dev_priv->counter;
 100
 101
 102 }
 103
 104 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
 105 {
 106         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 107         int ret = 0;
 108
 109         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
 110                   READ_BREADCRUMB(dev_priv));
 111
 112         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 113                 return 0;
 114
 115         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 116
 117         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 118                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 119
 120         if (ret == DRM_ERR(EBUSY)) {
 121                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
 122                           __FUNCTION__,
 123                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 124         }
 125
 126         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 127         return ret;
 128 }
 129
 130 int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 131 {
 132         drm_i915_private_t *dev_priv = dev->dev_private;
 133         unsigned int cur_vblank;
 134         int ret = 0;
 135
 136         if (!dev_priv) {
 137                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 138                 return DRM_ERR(EINVAL);
 139         }
 140
 141         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 142                     (((cur_vblank = atomic_read(&dev->vbl_received))
 143                         - *sequence) <= (1<<23)));
 144
 145         *sequence = cur_vblank;
 146
 147         return ret;
 148 }
 149
 150 /* Needs the lock as it touches the ring.
 151  */
 152 int i915_irq_emit(DRM_IOCTL_ARGS)
 153 {
 154         DRM_DEVICE;
 155         drm_i915_private_t *dev_priv = dev->dev_private;
 156         drm_i915_irq_emit_t emit;
 157         int result;
 158
 159         LOCK_TEST_WITH_RETURN(dev, filp);
 160
 161         if (!dev_priv) {
 162                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 163                 return DRM_ERR(EINVAL);
 164         }
 165
 166         DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
 167                                  sizeof(emit));
 168
 169         result = i915_emit_irq(dev);
 170
 171         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 172                 DRM_ERROR("copy_to_user\n");
 173                 return DRM_ERR(EFAULT);
 174         }
 175
 176         return 0;
 177 }
 178
 179 /* Doesn't need the hardware lock.
 180  */
 181 int i915_irq_wait(DRM_IOCTL_ARGS)
 182 {
 183         DRM_DEVICE;
 184         drm_i915_private_t *dev_priv = dev->dev_private;
 185         drm_i915_irq_wait_t irqwait;
 186
 187         if (!dev_priv) {
 188                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 189                 return DRM_ERR(EINVAL);
 190         }
 191
 192         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
 193                                  sizeof(irqwait));
 194
 195         return i915_wait_irq(dev, irqwait.irq_seq);
 196 }
 197
 198 static int i915_enable_interrupt (drm_device_t *dev)
 199 {
 200         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 201         u16 flag;
 202
 203         flag = 0;
 204         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 205                 flag |= VSYNC_PIPEA_FLAG;
 206         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 207                 flag |= VSYNC_PIPEB_FLAG;
 208         if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 209                 DRM_ERROR("%s called with invalid pipe 0x%x\n",
 210                           __FUNCTION__, dev_priv->vblank_pipe);
 211                 return DRM_ERR(EINVAL);
 212         }
 213         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
 214         return 0;
 215 }
 216
 217 /* Set the vblank monitor pipe
 218  */
 219 int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
 220 {
 221         DRM_DEVICE;
 222         drm_i915_private_t *dev_priv = dev->dev_private;
 223         drm_i915_vblank_pipe_t pipe;
 224
 225         if (!dev_priv) {
 226                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 227                 return DRM_ERR(EINVAL);
 228         }
 229
 230         DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
 231                                  sizeof(pipe));
 232
 233         dev_priv->vblank_pipe = pipe.pipe;
 234         return i915_enable_interrupt (dev);
 235 }
 236
 237 int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
 238 {
 239         DRM_DEVICE;
 240         drm_i915_private_t *dev_priv = dev->dev_private;
 241         drm_i915_vblank_pipe_t pipe;
 242         u16 flag;
 243
 244         if (!dev_priv) {
 245                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 246                 return DRM_ERR(EINVAL);
 247         }
 248
 249         flag = I915_READ(I915REG_INT_ENABLE_R);
 250         pipe.pipe = 0;
 251         if (flag & VSYNC_PIPEA_FLAG)
 252                 pipe.pipe |= DRM_I915_VBLANK_PIPE_A;
 253         if (flag & VSYNC_PIPEB_FLAG)
 254                 pipe.pipe |= DRM_I915_VBLANK_PIPE_B;
 255         DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
 256                                  sizeof(pipe));
 257         return 0;
 258 }
 259
 260 /* drm_dma.h hooks
 261 */
 262 void i915_driver_irq_preinstall(drm_device_t * dev)
 263 {
 264         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 265
 266         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 267         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 268         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 269 }
 270
 271 void i915_driver_irq_postinstall(drm_device_t * dev)
 272 {
 273         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 274
 275         i915_enable_interrupt(dev);
 276         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 277 }
 278
 279 void i915_driver_irq_uninstall(drm_device_t * dev)
 280 {
 281         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 282         u16 temp;
 283         if (!dev_priv)
 284                 return;
 285
 286         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 287         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 288         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 289
 290         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 291         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 292 }