Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / 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         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
71 static 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
79 int 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 }