1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright (C) 2013-2017 Oracle Corporation
4  * This file is based on ast_main.c
5  * Copyright 2012 Red Hat Inc.
6  * Authors: Dave Airlie <airlied@redhat.com>,
7  *          Michael Thayer <michael.thayer@oracle.com,
8  *          Hans de Goede <hdegoede@redhat.com>
9  */
10 
11 #include <linux/pci.h>
12 #include <linux/vbox_err.h>
13 
14 #include <drm/drm_fb_helper.h>
15 #include <drm/drm_crtc_helper.h>
16 #include <drm/drm_damage_helper.h>
17 
18 #include "vbox_drv.h"
19 #include "vboxvideo_guest.h"
20 #include "vboxvideo_vbe.h"
21 
22 void vbox_report_caps(struct vbox_private *vbox)
23 {
24 	u32 caps = VBVACAPS_DISABLE_CURSOR_INTEGRATION |
25 		   VBVACAPS_IRQ | VBVACAPS_USE_VBVA_ONLY;
26 
27 	/* The host only accepts VIDEO_MODE_HINTS if it is send separately. */
28 	hgsmi_send_caps_info(vbox->guest_pool, caps);
29 	caps |= VBVACAPS_VIDEO_MODE_HINTS;
30 	hgsmi_send_caps_info(vbox->guest_pool, caps);
31 }
32 
33 static int vbox_accel_init(struct vbox_private *vbox)
34 {
35 	struct pci_dev *pdev = to_pci_dev(vbox->ddev.dev);
36 	struct vbva_buffer *vbva;
37 	unsigned int i;
38 
39 	vbox->vbva_info = devm_kcalloc(vbox->ddev.dev, vbox->num_crtcs,
40 				       sizeof(*vbox->vbva_info), GFP_KERNEL);
41 	if (!vbox->vbva_info)
42 		return -ENOMEM;
43 
44 	/* Take a command buffer for each screen from the end of usable VRAM. */
45 	vbox->available_vram_size -= vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE;
46 
47 	vbox->vbva_buffers = pci_iomap_range(pdev, 0,
48 					     vbox->available_vram_size,
49 					     vbox->num_crtcs *
50 					     VBVA_MIN_BUFFER_SIZE);
51 	if (!vbox->vbva_buffers)
52 		return -ENOMEM;
53 
54 	for (i = 0; i < vbox->num_crtcs; ++i) {
55 		vbva_setup_buffer_context(&vbox->vbva_info[i],
56 					  vbox->available_vram_size +
57 					  i * VBVA_MIN_BUFFER_SIZE,
58 					  VBVA_MIN_BUFFER_SIZE);
59 		vbva = (void __force *)vbox->vbva_buffers +
60 			i * VBVA_MIN_BUFFER_SIZE;
61 		if (!vbva_enable(&vbox->vbva_info[i],
62 				 vbox->guest_pool, vbva, i)) {
63 			/* very old host or driver error. */
64 			DRM_ERROR("vboxvideo: vbva_enable failed\n");
65 		}
66 	}
67 
68 	return 0;
69 }
70 
71 static void vbox_accel_fini(struct vbox_private *vbox)
72 {
73 	unsigned int i;
74 
75 	for (i = 0; i < vbox->num_crtcs; ++i)
76 		vbva_disable(&vbox->vbva_info[i], vbox->guest_pool, i);
77 }
78 
79 /* Do we support the 4.3 plus mode hint reporting interface? */
80 static bool have_hgsmi_mode_hints(struct vbox_private *vbox)
81 {
82 	u32 have_hints, have_cursor;
83 	int ret;
84 
85 	ret = hgsmi_query_conf(vbox->guest_pool,
86 			       VBOX_VBVA_CONF32_MODE_HINT_REPORTING,
87 			       &have_hints);
88 	if (ret)
89 		return false;
90 
91 	ret = hgsmi_query_conf(vbox->guest_pool,
92 			       VBOX_VBVA_CONF32_GUEST_CURSOR_REPORTING,
93 			       &have_cursor);
94 	if (ret)
95 		return false;
96 
97 	return have_hints == VINF_SUCCESS && have_cursor == VINF_SUCCESS;
98 }
99 
100 bool vbox_check_supported(u16 id)
101 {
102 	u16 dispi_id;
103 
104 	vbox_write_ioport(VBE_DISPI_INDEX_ID, id);
105 	dispi_id = inw(VBE_DISPI_IOPORT_DATA);
106 
107 	return dispi_id == id;
108 }
109 
110 int vbox_hw_init(struct vbox_private *vbox)
111 {
112 	struct pci_dev *pdev = to_pci_dev(vbox->ddev.dev);
113 	int ret = -ENOMEM;
114 
115 	vbox->full_vram_size = inl(VBE_DISPI_IOPORT_DATA);
116 	vbox->any_pitch = vbox_check_supported(VBE_DISPI_ID_ANYX);
117 
118 	DRM_INFO("VRAM %08x\n", vbox->full_vram_size);
119 
120 	/* Map guest-heap at end of vram */
121 	vbox->guest_heap =
122 	    pci_iomap_range(pdev, 0, GUEST_HEAP_OFFSET(vbox),
123 			    GUEST_HEAP_SIZE);
124 	if (!vbox->guest_heap)
125 		return -ENOMEM;
126 
127 	/* Create guest-heap mem-pool use 2^4 = 16 byte chunks */
128 	vbox->guest_pool = devm_gen_pool_create(vbox->ddev.dev, 4, -1,
129 						"vboxvideo-accel");
130 	if (IS_ERR(vbox->guest_pool))
131 		return PTR_ERR(vbox->guest_pool);
132 
133 	ret = gen_pool_add_virt(vbox->guest_pool,
134 				(unsigned long)vbox->guest_heap,
135 				GUEST_HEAP_OFFSET(vbox),
136 				GUEST_HEAP_USABLE_SIZE, -1);
137 	if (ret)
138 		return ret;
139 
140 	ret = hgsmi_test_query_conf(vbox->guest_pool);
141 	if (ret) {
142 		DRM_ERROR("vboxvideo: hgsmi_test_query_conf failed\n");
143 		return ret;
144 	}
145 
146 	/* Reduce available VRAM size to reflect the guest heap. */
147 	vbox->available_vram_size = GUEST_HEAP_OFFSET(vbox);
148 	/* Linux drm represents monitors as a 32-bit array. */
149 	hgsmi_query_conf(vbox->guest_pool, VBOX_VBVA_CONF32_MONITOR_COUNT,
150 			 &vbox->num_crtcs);
151 	vbox->num_crtcs = clamp_t(u32, vbox->num_crtcs, 1, VBOX_MAX_SCREENS);
152 
153 	if (!have_hgsmi_mode_hints(vbox)) {
154 		ret = -ENOTSUPP;
155 		return ret;
156 	}
157 
158 	vbox->last_mode_hints = devm_kcalloc(vbox->ddev.dev, vbox->num_crtcs,
159 					     sizeof(struct vbva_modehint),
160 					     GFP_KERNEL);
161 	if (!vbox->last_mode_hints)
162 		return -ENOMEM;
163 
164 	ret = vbox_accel_init(vbox);
165 	if (ret)
166 		return ret;
167 
168 	return 0;
169 }
170 
171 void vbox_hw_fini(struct vbox_private *vbox)
172 {
173 	vbox_accel_fini(vbox);
174 }
175