LXR linux/drivers/gpu/drm/qxl/qxl

   1/*
   2 * Copyright 2013 Red Hat Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Dave Airlie
  23 *          Alon Levy
  24 */
  25
  26#include "qxl_drv.h"
  27
  28irqreturn_t qxl_irq_handler(int irq, void *arg)
  29{
  30        struct drm_device *dev = (struct drm_device *) arg;
  31        struct qxl_device *qdev = (struct qxl_device *)dev->dev_private;
  32        uint32_t pending;
  33
  34        pending = xchg(&qdev->ram_header->int_pending, 0);
  35
  36        if (!pending)
  37                return IRQ_NONE;
  38
  39        atomic_inc(&qdev->irq_received);
  40
  41        if (pending & QXL_INTERRUPT_DISPLAY) {
  42                atomic_inc(&qdev->irq_received_display);
  43                wake_up_all(&qdev->display_event);
  44                qxl_queue_garbage_collect(qdev, false);
  45        }
  46        if (pending & QXL_INTERRUPT_CURSOR) {
  47                atomic_inc(&qdev->irq_received_cursor);
  48                wake_up_all(&qdev->cursor_event);
  49        }
  50        if (pending & QXL_INTERRUPT_IO_CMD) {
  51                atomic_inc(&qdev->irq_received_io_cmd);
  52                wake_up_all(&qdev->io_cmd_event);
  53        }
  54        if (pending & QXL_INTERRUPT_ERROR) {
  55                /* TODO: log it, reset device (only way to exit this condition)
  56                 * (do it a certain number of times, afterwards admit defeat,
  57                 * to avoid endless loops).
  58                 */
  59                qdev->irq_received_error++;
  60                qxl_io_log(qdev, "%s: driver is in bug mode.\n", __func__);
  61        }
  62        if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
  63                qxl_io_log(qdev, "QXL_INTERRUPT_CLIENT_MONITORS_CONFIG\n");
  64                schedule_work(&qdev->client_monitors_config_work);
  65        }
  66        qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
  67        outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
  68        return IRQ_HANDLED;
  69}
  70
  71static void qxl_client_monitors_config_work_func(struct work_struct *work)
  72{
  73        struct qxl_device *qdev = container_of(work, struct qxl_device,
  74                                               client_monitors_config_work);
  75
  76        qxl_display_read_client_monitors_config(qdev);
  77}
  78
  79int qxl_irq_init(struct qxl_device *qdev)
  80{
  81        int ret;
  82
  83        init_waitqueue_head(&qdev->display_event);
  84        init_waitqueue_head(&qdev->cursor_event);
  85        init_waitqueue_head(&qdev->io_cmd_event);
  86        INIT_WORK(&qdev->client_monitors_config_work,
  87                  qxl_client_monitors_config_work_func);
  88        atomic_set(&qdev->irq_received, 0);
  89        atomic_set(&qdev->irq_received_display, 0);
  90        atomic_set(&qdev->irq_received_cursor, 0);
  91        atomic_set(&qdev->irq_received_io_cmd, 0);
  92        qdev->irq_received_error = 0;
  93        ret = drm_irq_install(qdev->ddev, qdev->ddev->pdev->irq);
  94        qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
  95        if (unlikely(ret != 0)) {
  96                DRM_ERROR("Failed installing irq: %d\n", ret);
  97                return 1;
  98        }
  99        return 0;
 100}
 101