drivers/gpu/drm/qxl/qxl_irq.c

   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
  28 irqreturn_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         atomic_inc(&qdev->irq_received);
  37
  38         if (pending & QXL_INTERRUPT_DISPLAY) {
  39                 atomic_inc(&qdev->irq_received_display);
  40                 wake_up_all(&qdev->display_event);
  41                 qxl_queue_garbage_collect(qdev, false);
  42         }
  43         if (pending & QXL_INTERRUPT_CURSOR) {
  44                 atomic_inc(&qdev->irq_received_cursor);
  45                 wake_up_all(&qdev->cursor_event);
  46         }
  47         if (pending & QXL_INTERRUPT_IO_CMD) {
  48                 atomic_inc(&qdev->irq_received_io_cmd);
  49                 wake_up_all(&qdev->io_cmd_event);
  50         }
  51         if (pending & QXL_INTERRUPT_ERROR) {
  52                 /* TODO: log it, reset device (only way to exit this condition)
  53                  * (do it a certain number of times, afterwards admit defeat,
  54                  * to avoid endless loops).
  55                  */
  56                 qdev->irq_received_error++;
  57                 qxl_io_log(qdev, "%s: driver is in bug mode.\n", __func__);
  58         }
  59         if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
  60                 qxl_io_log(qdev, "QXL_INTERRUPT_CLIENT_MONITORS_CONFIG\n");
  61                 schedule_work(&qdev->client_monitors_config_work);
  62         }
  63         qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
  64         outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
  65         return IRQ_HANDLED;
  66 }
  67
  68 static void qxl_client_monitors_config_work_func(struct work_struct *work)
  69 {
  70         struct qxl_device *qdev = container_of(work, struct qxl_device,
  71                                                client_monitors_config_work);
  72
  73         qxl_display_read_client_monitors_config(qdev);
  74 }
  75
  76 int qxl_irq_init(struct qxl_device *qdev)
  77 {
  78         int ret;
  79
  80         init_waitqueue_head(&qdev->display_event);
  81         init_waitqueue_head(&qdev->cursor_event);
  82         init_waitqueue_head(&qdev->io_cmd_event);
  83         INIT_WORK(&qdev->client_monitors_config_work,
  84                   qxl_client_monitors_config_work_func);
  85         atomic_set(&qdev->irq_received, 0);
  86         atomic_set(&qdev->irq_received_display, 0);
  87         atomic_set(&qdev->irq_received_cursor, 0);
  88         atomic_set(&qdev->irq_received_io_cmd, 0);
  89         qdev->irq_received_error = 0;
  90         ret = drm_irq_install(qdev->ddev, qdev->ddev->pdev->irq);
  91         qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
  92         if (unlikely(ret != 0)) {
  93                 DRM_ERROR("Failed installing irq: %d\n", ret);
  94                 return 1;
  95         }
  96         return 0;
  97 }