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	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
68static 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
76int 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);
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}