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