Merge remote-tracking branch 'spi/for-5.12' into spi-linus
[linux-2.6-microblaze.git] / 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 <linux/pci.h>
27
28 #include <drm/drm_irq.h>
29
30 #include "qxl_drv.h"
31
32 irqreturn_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
74 static 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
82 int qxl_irq_init(struct qxl_device *qdev)
83 {
84         struct pci_dev *pdev = to_pci_dev(qdev->ddev.dev);
85         int ret;
86
87         init_waitqueue_head(&qdev->display_event);
88         init_waitqueue_head(&qdev->cursor_event);
89         init_waitqueue_head(&qdev->io_cmd_event);
90         init_waitqueue_head(&qdev->release_event);
91         INIT_WORK(&qdev->client_monitors_config_work,
92                   qxl_client_monitors_config_work_func);
93         atomic_set(&qdev->irq_received, 0);
94         atomic_set(&qdev->irq_received_display, 0);
95         atomic_set(&qdev->irq_received_cursor, 0);
96         atomic_set(&qdev->irq_received_io_cmd, 0);
97         qdev->irq_received_error = 0;
98         ret = drm_irq_install(&qdev->ddev, pdev->irq);
99         qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
100         if (unlikely(ret != 0)) {
101                 DRM_ERROR("Failed installing irq: %d\n", ret);
102                 return 1;
103         }
104         return 0;
105 }