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 <linux/pci.h>
27
28#include <drm/drm_irq.h>
29
30#include "qxl_drv.h"
31
32irqreturn_t qxl_irq_handler(int irq, void *arg)
33{
34	struct drm_device *dev = (struct drm_device *) arg;
35	struct qxl_device *qdev = to_qxl(dev);
36	uint32_t pending;
37
38	pending = xchg(&qdev->ram_header->int_pending, 0);
39
40	if (!pending)
41		return IRQ_NONE;
42
43	atomic_inc(&qdev->irq_received);
44
45	if (pending & QXL_INTERRUPT_DISPLAY) {
46		atomic_inc(&qdev->irq_received_display);
47		wake_up_all(&qdev->display_event);
48		qxl_queue_garbage_collect(qdev, false);
49	}
50	if (pending & QXL_INTERRUPT_CURSOR) {
51		atomic_inc(&qdev->irq_received_cursor);
52		wake_up_all(&qdev->cursor_event);
53	}
54	if (pending & QXL_INTERRUPT_IO_CMD) {
55		atomic_inc(&qdev->irq_received_io_cmd);
56		wake_up_all(&qdev->io_cmd_event);
57	}
58	if (pending & QXL_INTERRUPT_ERROR) {
59		/* TODO: log it, reset device (only way to exit this condition)
60		 * (do it a certain number of times, afterwards admit defeat,
61		 * to avoid endless loops).
62		 */
63		qdev->irq_received_error++;
64		DRM_WARN("driver is in bug mode\n");
65	}
66	if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
67		schedule_work(&qdev->client_monitors_config_work);
68	}
69	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
70	outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
71	return IRQ_HANDLED;
72}
73
74static void qxl_client_monitors_config_work_func(struct work_struct *work)
75{
76	struct qxl_device *qdev = container_of(work, struct qxl_device,
77					       client_monitors_config_work);
78
79	qxl_display_read_client_monitors_config(qdev);
80}
81
82int qxl_irq_init(struct qxl_device *qdev)
83{
84	int ret;
85
86	init_waitqueue_head(&qdev->display_event);
87	init_waitqueue_head(&qdev->cursor_event);
88	init_waitqueue_head(&qdev->io_cmd_event);
89	INIT_WORK(&qdev->client_monitors_config_work,
90		  qxl_client_monitors_config_work_func);
91	atomic_set(&qdev->irq_received, 0);
92	atomic_set(&qdev->irq_received_display, 0);
93	atomic_set(&qdev->irq_received_cursor, 0);
94	atomic_set(&qdev->irq_received_io_cmd, 0);
95	qdev->irq_received_error = 0;
96	ret = drm_irq_install(&qdev->ddev, qdev->ddev.pdev->irq);
97	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
98	if (unlikely(ret != 0)) {
99		DRM_ERROR("Failed installing irq: %d\n", ret);
100		return 1;
101	}
102	return 0;
103}
104