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