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}