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