LXR linux/drivers/gpu/drm/drm

   1/*
   2 * drm_irq.c IRQ and vblank support
   3 *
   4 * \author Rickard E. (Rik) Faith <faith@valinux.com>
   5 * \author Gareth Hughes <gareth@valinux.com>
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a
   8 * copy of this software and associated documentation files (the "Software"),
   9 * to deal in the Software without restriction, including without limitation
  10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11 * and/or sell copies of the Software, and to permit persons to whom the
  12 * Software is furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice (including the next
  15 * paragraph) shall be included in all copies or substantial portions of the
  16 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  21 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24 * OTHER DEALINGS IN THE SOFTWARE.
  25 */
  26
  27/*
  28 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
  29 *
  30 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  31 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  32 * All Rights Reserved.
  33 *
  34 * Permission is hereby granted, free of charge, to any person obtaining a
  35 * copy of this software and associated documentation files (the "Software"),
  36 * to deal in the Software without restriction, including without limitation
  37 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  38 * and/or sell copies of the Software, and to permit persons to whom the
  39 * Software is furnished to do so, subject to the following conditions:
  40 *
  41 * The above copyright notice and this permission notice (including the next
  42 * paragraph) shall be included in all copies or substantial portions of the
  43 * Software.
  44 *
  45 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  46 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  47 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  48 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  49 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  50 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  51 * OTHER DEALINGS IN THE SOFTWARE.
  52 */
  53
  54
  55#include <linux/export.h>
  56#include <linux/interrupt.h>    /* For task queue support */
  57#include <linux/pci.h>
  58#include <linux/vgaarb.h>
  59
  60#include <drm/drm.h>
  61#include <drm/drm_device.h>
  62#include <drm/drm_drv.h>
  63#include <drm/drm_legacy.h>
  64#include <drm/drm_print.h>
  65#include <drm/drm_vblank.h>
  66
  67#include "drm_internal.h"
  68
  69static int drm_legacy_irq_install(struct drm_device *dev, int irq)
  70{
  71        int ret;
  72        unsigned long sh_flags = 0;
  73
  74        if (irq == 0)
  75                return -EINVAL;
  76
  77        if (dev->irq_enabled)
  78                return -EBUSY;
  79        dev->irq_enabled = true;
  80
  81        DRM_DEBUG("irq=%d\n", irq);
  82
  83        /* Before installing handler */
  84        if (dev->driver->irq_preinstall)
  85                dev->driver->irq_preinstall(dev);
  86
  87        /* PCI devices require shared interrupts. */
  88        if (dev_is_pci(dev->dev))
  89                sh_flags = IRQF_SHARED;
  90
  91        ret = request_irq(irq, dev->driver->irq_handler,
  92                          sh_flags, dev->driver->name, dev);
  93
  94        if (ret < 0) {
  95                dev->irq_enabled = false;
  96                return ret;
  97        }
  98
  99        /* After installing handler */
 100        if (dev->driver->irq_postinstall)
 101                ret = dev->driver->irq_postinstall(dev);
 102
 103        if (ret < 0) {
 104                dev->irq_enabled = false;
 105                if (drm_core_check_feature(dev, DRIVER_LEGACY))
 106                        vga_client_unregister(to_pci_dev(dev->dev));
 107                free_irq(irq, dev);
 108        } else {
 109                dev->irq = irq;
 110        }
 111
 112        return ret;
 113}
 114
 115int drm_legacy_irq_uninstall(struct drm_device *dev)
 116{
 117        unsigned long irqflags;
 118        bool irq_enabled;
 119        int i;
 120
 121        irq_enabled = dev->irq_enabled;
 122        dev->irq_enabled = false;
 123
 124        /*
 125         * Wake up any waiters so they don't hang. This is just to paper over
 126         * issues for UMS drivers which aren't in full control of their
 127         * vblank/irq handling. KMS drivers must ensure that vblanks are all
 128         * disabled when uninstalling the irq handler.
 129         */
 130        if (drm_dev_has_vblank(dev)) {
 131                spin_lock_irqsave(&dev->vbl_lock, irqflags);
 132                for (i = 0; i < dev->num_crtcs; i++) {
 133                        struct drm_vblank_crtc *vblank = &dev->vblank[i];
 134
 135                        if (!vblank->enabled)
 136                                continue;
 137
 138                        WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
 139
 140                        drm_vblank_disable_and_save(dev, i);
 141                        wake_up(&vblank->queue);
 142                }
 143                spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 144        }
 145
 146        if (!irq_enabled)
 147                return -EINVAL;
 148
 149        DRM_DEBUG("irq=%d\n", dev->irq);
 150
 151        if (drm_core_check_feature(dev, DRIVER_LEGACY))
 152                vga_client_unregister(to_pci_dev(dev->dev));
 153
 154        if (dev->driver->irq_uninstall)
 155                dev->driver->irq_uninstall(dev);
 156
 157        free_irq(dev->irq, dev);
 158
 159        return 0;
 160}
 161EXPORT_SYMBOL(drm_legacy_irq_uninstall);
 162
 163int drm_legacy_irq_control(struct drm_device *dev, void *data,
 164                           struct drm_file *file_priv)
 165{
 166        struct drm_control *ctl = data;
 167        int ret = 0, irq;
 168        struct pci_dev *pdev;
 169
 170        /* if we haven't irq we fallback for compatibility reasons -
 171         * this used to be a separate function in drm_dma.h
 172         */
 173
 174        if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 175                return 0;
 176        if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 177                return 0;
 178        /* UMS was only ever supported on pci devices. */
 179        if (WARN_ON(!dev_is_pci(dev->dev)))
 180                return -EINVAL;
 181
 182        switch (ctl->func) {
 183        case DRM_INST_HANDLER:
 184                pdev = to_pci_dev(dev->dev);
 185                irq = pdev->irq;
 186
 187                if (dev->if_version < DRM_IF_VERSION(1, 2) &&
 188                    ctl->irq != irq)
 189                        return -EINVAL;
 190                mutex_lock(&dev->struct_mutex);
 191                ret = drm_legacy_irq_install(dev, irq);
 192                mutex_unlock(&dev->struct_mutex);
 193
 194                return ret;
 195        case DRM_UNINST_HANDLER:
 196                mutex_lock(&dev->struct_mutex);
 197                ret = drm_legacy_irq_uninstall(dev);
 198                mutex_unlock(&dev->struct_mutex);
 199
 200                return ret;
 201        default:
 202                return -EINVAL;
 203        }
 204}
 205