1/*	$NetBSD: vbox_main.c,v 1.2 2021/12/18 23:45:44 riastradh Exp $	*/
2
3// SPDX-License-Identifier: MIT
4/*
5 * Copyright (C) 2013-2017 Oracle Corporation
6 * This file is based on ast_main.c
7 * Copyright 2012 Red Hat Inc.
8 * Authors: Dave Airlie <airlied@redhat.com>,
9 *          Michael Thayer <michael.thayer@oracle.com,
10 *          Hans de Goede <hdegoede@redhat.com>
11 */
12
13#include <sys/cdefs.h>
14__KERNEL_RCSID(0, "$NetBSD: vbox_main.c,v 1.2 2021/12/18 23:45:44 riastradh Exp $");
15
16#include <linux/vbox_err.h>
17#include <drm/drm_fb_helper.h>
18#include <drm/drm_crtc_helper.h>
19#include <drm/drm_damage_helper.h>
20
21#include "vbox_drv.h"
22#include "vboxvideo_guest.h"
23#include "vboxvideo_vbe.h"
24
25void vbox_report_caps(struct vbox_private *vbox)
26{
27	u32 caps = VBVACAPS_DISABLE_CURSOR_INTEGRATION |
28		   VBVACAPS_IRQ | VBVACAPS_USE_VBVA_ONLY;
29
30	/* The host only accepts VIDEO_MODE_HINTS if it is send separately. */
31	hgsmi_send_caps_info(vbox->guest_pool, caps);
32	caps |= VBVACAPS_VIDEO_MODE_HINTS;
33	hgsmi_send_caps_info(vbox->guest_pool, caps);
34}
35
36static int vbox_accel_init(struct vbox_private *vbox)
37{
38	struct vbva_buffer *vbva;
39	unsigned int i;
40
41	vbox->vbva_info = devm_kcalloc(vbox->ddev.dev, vbox->num_crtcs,
42				       sizeof(*vbox->vbva_info), GFP_KERNEL);
43	if (!vbox->vbva_info)
44		return -ENOMEM;
45
46	/* Take a command buffer for each screen from the end of usable VRAM. */
47	vbox->available_vram_size -= vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE;
48
49	vbox->vbva_buffers = pci_iomap_range(vbox->ddev.pdev, 0,
50					     vbox->available_vram_size,
51					     vbox->num_crtcs *
52					     VBVA_MIN_BUFFER_SIZE);
53	if (!vbox->vbva_buffers)
54		return -ENOMEM;
55
56	for (i = 0; i < vbox->num_crtcs; ++i) {
57		vbva_setup_buffer_context(&vbox->vbva_info[i],
58					  vbox->available_vram_size +
59					  i * VBVA_MIN_BUFFER_SIZE,
60					  VBVA_MIN_BUFFER_SIZE);
61		vbva = (void __force *)vbox->vbva_buffers +
62			i * VBVA_MIN_BUFFER_SIZE;
63		if (!vbva_enable(&vbox->vbva_info[i],
64				 vbox->guest_pool, vbva, i)) {
65			/* very old host or driver error. */
66			DRM_ERROR("vboxvideo: vbva_enable failed\n");
67		}
68	}
69
70	return 0;
71}
72
73static void vbox_accel_fini(struct vbox_private *vbox)
74{
75	unsigned int i;
76
77	for (i = 0; i < vbox->num_crtcs; ++i)
78		vbva_disable(&vbox->vbva_info[i], vbox->guest_pool, i);
79
80	pci_iounmap(vbox->ddev.pdev, vbox->vbva_buffers);
81}
82
83/* Do we support the 4.3 plus mode hint reporting interface? */
84static bool have_hgsmi_mode_hints(struct vbox_private *vbox)
85{
86	u32 have_hints, have_cursor;
87	int ret;
88
89	ret = hgsmi_query_conf(vbox->guest_pool,
90			       VBOX_VBVA_CONF32_MODE_HINT_REPORTING,
91			       &have_hints);
92	if (ret)
93		return false;
94
95	ret = hgsmi_query_conf(vbox->guest_pool,
96			       VBOX_VBVA_CONF32_GUEST_CURSOR_REPORTING,
97			       &have_cursor);
98	if (ret)
99		return false;
100
101	return have_hints == VINF_SUCCESS && have_cursor == VINF_SUCCESS;
102}
103
104bool vbox_check_supported(u16 id)
105{
106	u16 dispi_id;
107
108	vbox_write_ioport(VBE_DISPI_INDEX_ID, id);
109	dispi_id = inw(VBE_DISPI_IOPORT_DATA);
110
111	return dispi_id == id;
112}
113
114int vbox_hw_init(struct vbox_private *vbox)
115{
116	int ret = -ENOMEM;
117
118	vbox->full_vram_size = inl(VBE_DISPI_IOPORT_DATA);
119	vbox->any_pitch = vbox_check_supported(VBE_DISPI_ID_ANYX);
120
121	DRM_INFO("VRAM %08x\n", vbox->full_vram_size);
122
123	/* Map guest-heap at end of vram */
124	vbox->guest_heap =
125	    pci_iomap_range(vbox->ddev.pdev, 0, GUEST_HEAP_OFFSET(vbox),
126			    GUEST_HEAP_SIZE);
127	if (!vbox->guest_heap)
128		return -ENOMEM;
129
130	/* Create guest-heap mem-pool use 2^4 = 16 byte chunks */
131	vbox->guest_pool = gen_pool_create(4, -1);
132	if (!vbox->guest_pool)
133		goto err_unmap_guest_heap;
134
135	ret = gen_pool_add_virt(vbox->guest_pool,
136				(unsigned long)vbox->guest_heap,
137				GUEST_HEAP_OFFSET(vbox),
138				GUEST_HEAP_USABLE_SIZE, -1);
139	if (ret)
140		goto err_destroy_guest_pool;
141
142	ret = hgsmi_test_query_conf(vbox->guest_pool);
143	if (ret) {
144		DRM_ERROR("vboxvideo: hgsmi_test_query_conf failed\n");
145		goto err_destroy_guest_pool;
146	}
147
148	/* Reduce available VRAM size to reflect the guest heap. */
149	vbox->available_vram_size = GUEST_HEAP_OFFSET(vbox);
150	/* Linux drm represents monitors as a 32-bit array. */
151	hgsmi_query_conf(vbox->guest_pool, VBOX_VBVA_CONF32_MONITOR_COUNT,
152			 &vbox->num_crtcs);
153	vbox->num_crtcs = clamp_t(u32, vbox->num_crtcs, 1, VBOX_MAX_SCREENS);
154
155	if (!have_hgsmi_mode_hints(vbox)) {
156		ret = -ENOTSUPP;
157		goto err_destroy_guest_pool;
158	}
159
160	vbox->last_mode_hints = devm_kcalloc(vbox->ddev.dev, vbox->num_crtcs,
161					     sizeof(struct vbva_modehint),
162					     GFP_KERNEL);
163	if (!vbox->last_mode_hints) {
164		ret = -ENOMEM;
165		goto err_destroy_guest_pool;
166	}
167
168	ret = vbox_accel_init(vbox);
169	if (ret)
170		goto err_destroy_guest_pool;
171
172	return 0;
173
174err_destroy_guest_pool:
175	gen_pool_destroy(vbox->guest_pool);
176err_unmap_guest_heap:
177	pci_iounmap(vbox->ddev.pdev, vbox->guest_heap);
178	return ret;
179}
180
181void vbox_hw_fini(struct vbox_private *vbox)
182{
183	vbox_accel_fini(vbox);
184	gen_pool_destroy(vbox->guest_pool);
185	pci_iounmap(vbox->ddev.pdev, vbox->guest_heap);
186}
187