1 // SPDX-License-Identifier: MIT
2 /* Copyright (C) 2006-2017 Oracle Corporation */
3 
4 #include <linux/vbox_err.h>
5 #include "vbox_drv.h"
6 #include "vboxvideo_guest.h"
7 #include "vboxvideo_vbe.h"
8 #include "hgsmi_channels.h"
9 
10 /**
11  * Set a video mode via an HGSMI request.  The views must have been
12  * initialised first using @a VBoxHGSMISendViewInfo and if the mode is being
13  * set on the first display then it must be set first using registers.
14  * @ctx:           The context containing the heap to use.
15  * @display:       The screen number.
16  * @origin_x:      The horizontal displacement relative to the first scrn.
17  * @origin_y:      The vertical displacement relative to the first screen.
18  * @start_offset:  The offset of the visible area of the framebuffer
19  *                 relative to the framebuffer start.
20  * @pitch:         The offset in bytes between the starts of two adjecent
21  *                 scan lines in video RAM.
22  * @width:         The mode width.
23  * @height:        The mode height.
24  * @bpp:           The colour depth of the mode.
25  * @flags:         Flags.
26  */
27 void hgsmi_process_display_info(struct gen_pool *ctx, u32 display,
28 				s32 origin_x, s32 origin_y, u32 start_offset,
29 				u32 pitch, u32 width, u32 height,
30 				u16 bpp, u16 flags)
31 {
32 	struct vbva_infoscreen *p;
33 
34 	p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA,
35 			       VBVA_INFO_SCREEN);
36 	if (!p)
37 		return;
38 
39 	p->view_index = display;
40 	p->origin_x = origin_x;
41 	p->origin_y = origin_y;
42 	p->start_offset = start_offset;
43 	p->line_size = pitch;
44 	p->width = width;
45 	p->height = height;
46 	p->bits_per_pixel = bpp;
47 	p->flags = flags;
48 
49 	hgsmi_buffer_submit(ctx, p);
50 	hgsmi_buffer_free(ctx, p);
51 }
52 
53 /**
54  * Report the rectangle relative to which absolute pointer events should be
55  * expressed.  This information remains valid until the next VBVA resize event
56  * for any screen, at which time it is reset to the bounding rectangle of all
57  * virtual screens.
58  * Return: 0 or negative errno value.
59  * @ctx:       The context containing the heap to use.
60  * @origin_x:  Upper left X co-ordinate relative to the first screen.
61  * @origin_y:  Upper left Y co-ordinate relative to the first screen.
62  * @width:     Rectangle width.
63  * @height:    Rectangle height.
64  */
65 int hgsmi_update_input_mapping(struct gen_pool *ctx, s32 origin_x, s32 origin_y,
66 			       u32 width, u32 height)
67 {
68 	struct vbva_report_input_mapping *p;
69 
70 	p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA,
71 			       VBVA_REPORT_INPUT_MAPPING);
72 	if (!p)
73 		return -ENOMEM;
74 
75 	p->x = origin_x;
76 	p->y = origin_y;
77 	p->cx = width;
78 	p->cy = height;
79 
80 	hgsmi_buffer_submit(ctx, p);
81 	hgsmi_buffer_free(ctx, p);
82 
83 	return 0;
84 }
85 
86 /**
87  * Get most recent video mode hints.
88  * Return: 0 or negative errno value.
89  * @ctx:      The context containing the heap to use.
90  * @screens:  The number of screens to query hints for, starting at 0.
91  * @hints:    Array of vbva_modehint structures for receiving the hints.
92  */
93 int hgsmi_get_mode_hints(struct gen_pool *ctx, unsigned int screens,
94 			 struct vbva_modehint *hints)
95 {
96 	struct vbva_query_mode_hints *p;
97 	size_t size;
98 
99 	if (WARN_ON(!hints))
100 		return -EINVAL;
101 
102 	size = screens * sizeof(struct vbva_modehint);
103 	p = hgsmi_buffer_alloc(ctx, sizeof(*p) + size, HGSMI_CH_VBVA,
104 			       VBVA_QUERY_MODE_HINTS);
105 	if (!p)
106 		return -ENOMEM;
107 
108 	p->hints_queried_count = screens;
109 	p->hint_structure_guest_size = sizeof(struct vbva_modehint);
110 	p->rc = VERR_NOT_SUPPORTED;
111 
112 	hgsmi_buffer_submit(ctx, p);
113 
114 	if (p->rc < 0) {
115 		hgsmi_buffer_free(ctx, p);
116 		return -EIO;
117 	}
118 
119 	memcpy(hints, ((u8 *)p) + sizeof(struct vbva_query_mode_hints), size);
120 	hgsmi_buffer_free(ctx, p);
121 
122 	return 0;
123 }
124