330 lines
8.2 KiB
C
330 lines
8.2 KiB
C
/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
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*/
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/*
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* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "drmP.h"
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#include "drm.h"
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#include "i915_drm.h"
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#include "i915_drv.h"
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#define USER_INT_FLAG (1<<1)
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#define VSYNC_PIPEB_FLAG (1<<5)
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#define VSYNC_PIPEA_FLAG (1<<7)
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#define MAX_NOPID ((u32)~0)
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irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
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{
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drm_device_t *dev = (drm_device_t *) arg;
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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u16 temp;
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temp = I915_READ16(I915REG_INT_IDENTITY_R);
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temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
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DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
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if (temp == 0)
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return IRQ_NONE;
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I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
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dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
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if (temp & USER_INT_FLAG) {
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DRM_WAKEUP(&dev_priv->irq_queue);
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#ifdef I915_HAVE_FENCE
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i915_fence_handler(dev);
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#endif
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}
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if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
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atomic_inc(&dev->vbl_received);
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DRM_WAKEUP(&dev->vbl_queue);
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drm_vbl_send_signals(dev);
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}
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return IRQ_HANDLED;
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}
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int i915_emit_irq(drm_device_t * dev)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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RING_LOCALS;
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i915_kernel_lost_context(dev);
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DRM_DEBUG("%s\n", __FUNCTION__);
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dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
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if (dev_priv->counter > 0x7FFFFFFFUL)
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dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
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BEGIN_LP_RING(6);
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OUT_RING(CMD_STORE_DWORD_IDX);
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OUT_RING(20);
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OUT_RING(dev_priv->counter);
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OUT_RING(0);
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OUT_RING(0);
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OUT_RING(GFX_OP_USER_INTERRUPT);
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ADVANCE_LP_RING();
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return dev_priv->counter;
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}
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void i915_user_irq_on(drm_i915_private_t *dev_priv)
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{
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spin_lock(&dev_priv->user_irq_lock);
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if (dev_priv->irq_enabled && (++dev_priv->user_irq_refcount > 0)){
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dev_priv->irq_enable_reg |= USER_INT_FLAG;
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I915_WRITE16(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
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}
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spin_unlock(&dev_priv->user_irq_lock);
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}
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void i915_user_irq_off(drm_i915_private_t *dev_priv)
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{
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spin_lock(&dev_priv->user_irq_lock);
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if (dev_priv->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
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dev_priv->irq_enable_reg &= ~USER_INT_FLAG;
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I915_WRITE16(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
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}
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spin_unlock(&dev_priv->user_irq_lock);
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}
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static int i915_wait_irq(drm_device_t * dev, int irq_nr)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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int ret = 0;
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DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
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READ_BREADCRUMB(dev_priv));
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if (READ_BREADCRUMB(dev_priv) >= irq_nr)
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return 0;
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dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
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i915_user_irq_on(dev_priv);
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DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
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READ_BREADCRUMB(dev_priv) >= irq_nr);
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i915_user_irq_off(dev_priv);
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if (ret == DRM_ERR(EBUSY)) {
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DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
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__FUNCTION__,
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READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
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}
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dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
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return ret;
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}
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int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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unsigned int cur_vblank;
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int ret = 0;
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if (!dev_priv) {
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DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
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return DRM_ERR(EINVAL);
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}
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DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
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(((cur_vblank = atomic_read(&dev->vbl_received))
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- *sequence) <= (1<<23)));
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*sequence = cur_vblank;
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return ret;
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}
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/* Needs the lock as it touches the ring.
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*/
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int i915_irq_emit(DRM_IOCTL_ARGS)
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{
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DRM_DEVICE;
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drm_i915_private_t *dev_priv = dev->dev_private;
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drm_i915_irq_emit_t emit;
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int result;
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LOCK_TEST_WITH_RETURN(dev, filp);
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if (!dev_priv) {
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DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
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return DRM_ERR(EINVAL);
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}
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DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
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sizeof(emit));
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result = i915_emit_irq(dev);
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if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
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DRM_ERROR("copy_to_user\n");
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return DRM_ERR(EFAULT);
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}
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return 0;
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}
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/* Doesn't need the hardware lock.
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*/
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int i915_irq_wait(DRM_IOCTL_ARGS)
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{
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DRM_DEVICE;
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drm_i915_private_t *dev_priv = dev->dev_private;
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drm_i915_irq_wait_t irqwait;
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if (!dev_priv) {
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DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
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return DRM_ERR(EINVAL);
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}
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DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
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sizeof(irqwait));
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return i915_wait_irq(dev, irqwait.irq_seq);
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}
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static int i915_enable_interrupt (drm_device_t *dev)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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u16 flag;
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flag = 0;
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if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
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flag |= VSYNC_PIPEA_FLAG;
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if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
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flag |= VSYNC_PIPEB_FLAG;
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if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
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DRM_ERROR("%s called with invalid pipe 0x%x\n",
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__FUNCTION__, dev_priv->vblank_pipe);
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return DRM_ERR(EINVAL);
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}
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dev_priv->user_irq_lock = SPIN_LOCK_UNLOCKED;
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dev_priv->user_irq_refcount = 0;
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dev_priv->irq_enable_reg = flag;
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I915_WRITE16(I915REG_INT_ENABLE_R, flag);
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dev_priv->irq_enabled = 1;
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return 0;
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}
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/* Set the vblank monitor pipe
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*/
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int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
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{
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DRM_DEVICE;
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drm_i915_private_t *dev_priv = dev->dev_private;
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drm_i915_vblank_pipe_t pipe;
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if (!dev_priv) {
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DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
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return DRM_ERR(EINVAL);
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}
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DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
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sizeof(pipe));
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dev_priv->vblank_pipe = pipe.pipe;
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return i915_enable_interrupt (dev);
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}
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int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
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{
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DRM_DEVICE;
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drm_i915_private_t *dev_priv = dev->dev_private;
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drm_i915_vblank_pipe_t pipe;
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u16 flag;
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if (!dev_priv) {
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DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
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return DRM_ERR(EINVAL);
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}
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flag = I915_READ(I915REG_INT_ENABLE_R);
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pipe.pipe = 0;
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if (flag & VSYNC_PIPEA_FLAG)
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pipe.pipe |= DRM_I915_VBLANK_PIPE_A;
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if (flag & VSYNC_PIPEB_FLAG)
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pipe.pipe |= DRM_I915_VBLANK_PIPE_B;
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DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
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sizeof(pipe));
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return 0;
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}
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/* drm_dma.h hooks
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*/
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void i915_driver_irq_preinstall(drm_device_t * dev)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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I915_WRITE16(I915REG_HWSTAM, 0xeffe);
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I915_WRITE16(I915REG_INT_MASK_R, 0x0);
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I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
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}
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void i915_driver_irq_postinstall(drm_device_t * dev)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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i915_enable_interrupt(dev);
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DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
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/*
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* Initialize the hardware status page IRQ location.
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*/
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I915_WRITE(I915REG_INSTPM, ( 1 << 5) | ( 1 << 21));
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}
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void i915_driver_irq_uninstall(drm_device_t * dev)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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u16 temp;
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if (!dev_priv)
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return;
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dev_priv->irq_enabled = 0;
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I915_WRITE16(I915REG_HWSTAM, 0xffff);
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I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
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I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
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temp = I915_READ16(I915REG_INT_IDENTITY_R);
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I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
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}
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