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