xref: /openbmc/linux/drivers/gpu/drm/qxl/qxl_irq.c (revision d2999e1b)
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 	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 
68 static 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 
76 int 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, qdev->ddev->pdev->irq);
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 }
98