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_drv.h>
29 
30 #include "qxl_drv.h"
31 
qxl_irq_handler(int irq,void * arg)32 static 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 
qxl_client_monitors_config_work_func(struct work_struct * work)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 
qxl_irq_init(struct qxl_device * qdev)82 int qxl_irq_init(struct qxl_device *qdev)
83 {
84 	struct drm_device *ddev = &qdev->ddev;
85 	struct pci_dev *pdev = to_pci_dev(ddev->dev);
86 	int ret;
87 
88 	init_waitqueue_head(&qdev->display_event);
89 	init_waitqueue_head(&qdev->cursor_event);
90 	init_waitqueue_head(&qdev->io_cmd_event);
91 	init_waitqueue_head(&qdev->release_event);
92 	INIT_WORK(&qdev->client_monitors_config_work,
93 		  qxl_client_monitors_config_work_func);
94 	atomic_set(&qdev->irq_received, 0);
95 	atomic_set(&qdev->irq_received_display, 0);
96 	atomic_set(&qdev->irq_received_cursor, 0);
97 	atomic_set(&qdev->irq_received_io_cmd, 0);
98 	qdev->irq_received_error = 0;
99 	ret = request_irq(pdev->irq, qxl_irq_handler, IRQF_SHARED, ddev->driver->name, ddev);
100 	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
101 	if (unlikely(ret != 0)) {
102 		DRM_ERROR("Failed installing irq: %d\n", ret);
103 		return 1;
104 	}
105 	return 0;
106 }
107