xref: /linux/drivers/gpu/drm/vboxvideo/vbox_main.c (revision 815e260a18a3af4dab59025ee99a7156c0e8b5e0)
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 #include <drm/drm_print.h>
16 
17 #include "vbox_drv.h"
18 #include "vboxvideo_guest.h"
19 #include "vboxvideo_vbe.h"
20 
21 void vbox_report_caps(struct vbox_private *vbox)
22 {
23 	u32 caps = VBVACAPS_DISABLE_CURSOR_INTEGRATION |
24 		   VBVACAPS_IRQ | VBVACAPS_USE_VBVA_ONLY;
25 
26 	/* The host only accepts VIDEO_MODE_HINTS if it is send separately. */
27 	hgsmi_send_caps_info(vbox->guest_pool, caps);
28 	caps |= VBVACAPS_VIDEO_MODE_HINTS;
29 	hgsmi_send_caps_info(vbox->guest_pool, caps);
30 }
31 
32 static int vbox_accel_init(struct vbox_private *vbox)
33 {
34 	struct pci_dev *pdev = to_pci_dev(vbox->ddev.dev);
35 	struct vbva_buffer *vbva;
36 	unsigned int i;
37 
38 	vbox->vbva_info = devm_kcalloc(vbox->ddev.dev, vbox->num_crtcs,
39 				       sizeof(*vbox->vbva_info), GFP_KERNEL);
40 	if (!vbox->vbva_info)
41 		return -ENOMEM;
42 
43 	/* Take a command buffer for each screen from the end of usable VRAM. */
44 	vbox->available_vram_size -= vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE;
45 
46 	vbox->vbva_buffers = pcim_iomap_range(
47 			pdev, 0, vbox->available_vram_size,
48 			vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE);
49 	if (IS_ERR(vbox->vbva_buffers))
50 		return PTR_ERR(vbox->vbva_buffers);
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 	ret = pcim_request_region(pdev, 0, "vboxvideo");
119 	if (ret)
120 		return ret;
121 
122 	/* Map guest-heap at end of vram */
123 	vbox->guest_heap = pcim_iomap_range(pdev, 0,
124 			GUEST_HEAP_OFFSET(vbox), GUEST_HEAP_SIZE);
125 	if (IS_ERR(vbox->guest_heap))
126 		return PTR_ERR(vbox->guest_heap);
127 
128 	/* Create guest-heap mem-pool use 2^4 = 16 byte chunks */
129 	vbox->guest_pool = devm_gen_pool_create(vbox->ddev.dev, 4, -1,
130 						"vboxvideo-accel");
131 	if (IS_ERR(vbox->guest_pool))
132 		return PTR_ERR(vbox->guest_pool);
133 
134 	ret = gen_pool_add_virt(vbox->guest_pool,
135 				(unsigned long)vbox->guest_heap,
136 				GUEST_HEAP_OFFSET(vbox),
137 				GUEST_HEAP_USABLE_SIZE, -1);
138 	if (ret)
139 		return ret;
140 
141 	ret = hgsmi_test_query_conf(vbox->guest_pool);
142 	if (ret) {
143 		DRM_ERROR("vboxvideo: hgsmi_test_query_conf failed\n");
144 		return ret;
145 	}
146 
147 	/* Reduce available VRAM size to reflect the guest heap. */
148 	vbox->available_vram_size = GUEST_HEAP_OFFSET(vbox);
149 	/* Linux drm represents monitors as a 32-bit array. */
150 	hgsmi_query_conf(vbox->guest_pool, VBOX_VBVA_CONF32_MONITOR_COUNT,
151 			 &vbox->num_crtcs);
152 	vbox->num_crtcs = clamp_t(u32, vbox->num_crtcs, 1, VBOX_MAX_SCREENS);
153 
154 	if (!have_hgsmi_mode_hints(vbox)) {
155 		ret = -ENOTSUPP;
156 		return ret;
157 	}
158 
159 	vbox->last_mode_hints = devm_kcalloc(vbox->ddev.dev, vbox->num_crtcs,
160 					     sizeof(struct vbva_modehint),
161 					     GFP_KERNEL);
162 	if (!vbox->last_mode_hints)
163 		return -ENOMEM;
164 
165 	ret = vbox_accel_init(vbox);
166 	if (ret)
167 		return ret;
168 
169 	return 0;
170 }
171 
172 void vbox_hw_fini(struct vbox_private *vbox)
173 {
174 	vbox_accel_fini(vbox);
175 }
176