1 /* $NetBSD: qxl_irq.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $ */
2
3 /*
4 * Copyright 2013 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Dave Airlie
25 * Alon Levy
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: qxl_irq.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $");
30
31 #include <linux/pci.h>
32
33 #include <drm/drm_irq.h>
34
35 #include "qxl_drv.h"
36
qxl_irq_handler(int irq,void * arg)37 irqreturn_t qxl_irq_handler(int irq, void *arg)
38 {
39 struct drm_device *dev = (struct drm_device *) arg;
40 struct qxl_device *qdev = (struct qxl_device *)dev->dev_private;
41 uint32_t pending;
42
43 pending = xchg(&qdev->ram_header->int_pending, 0);
44
45 if (!pending)
46 return IRQ_NONE;
47
48 atomic_inc(&qdev->irq_received);
49
50 if (pending & QXL_INTERRUPT_DISPLAY) {
51 atomic_inc(&qdev->irq_received_display);
52 wake_up_all(&qdev->display_event);
53 qxl_queue_garbage_collect(qdev, false);
54 }
55 if (pending & QXL_INTERRUPT_CURSOR) {
56 atomic_inc(&qdev->irq_received_cursor);
57 wake_up_all(&qdev->cursor_event);
58 }
59 if (pending & QXL_INTERRUPT_IO_CMD) {
60 atomic_inc(&qdev->irq_received_io_cmd);
61 wake_up_all(&qdev->io_cmd_event);
62 }
63 if (pending & QXL_INTERRUPT_ERROR) {
64 /* TODO: log it, reset device (only way to exit this condition)
65 * (do it a certain number of times, afterwards admit defeat,
66 * to avoid endless loops).
67 */
68 qdev->irq_received_error++;
69 DRM_WARN("driver is in bug mode\n");
70 }
71 if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
72 schedule_work(&qdev->client_monitors_config_work);
73 }
74 qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
75 outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
76 return IRQ_HANDLED;
77 }
78
qxl_client_monitors_config_work_func(struct work_struct * work)79 static void qxl_client_monitors_config_work_func(struct work_struct *work)
80 {
81 struct qxl_device *qdev = container_of(work, struct qxl_device,
82 client_monitors_config_work);
83
84 qxl_display_read_client_monitors_config(qdev);
85 }
86
qxl_irq_init(struct qxl_device * qdev)87 int qxl_irq_init(struct qxl_device *qdev)
88 {
89 int ret;
90
91 init_waitqueue_head(&qdev->display_event);
92 init_waitqueue_head(&qdev->cursor_event);
93 init_waitqueue_head(&qdev->io_cmd_event);
94 INIT_WORK(&qdev->client_monitors_config_work,
95 qxl_client_monitors_config_work_func);
96 atomic_set(&qdev->irq_received, 0);
97 atomic_set(&qdev->irq_received_display, 0);
98 atomic_set(&qdev->irq_received_cursor, 0);
99 atomic_set(&qdev->irq_received_io_cmd, 0);
100 qdev->irq_received_error = 0;
101 #ifdef __NetBSD__
102 ret = drm_irq_install(qdev->ddev);
103 #else
104 ret = drm_irq_install(&qdev->ddev, qdev->ddev.pdev->irq);
105 #endif
106 qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
107 if (unlikely(ret != 0)) {
108 DRM_ERROR("Failed installing irq: %d\n", ret);
109 return 1;
110 }
111 return 0;
112 }
113