1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2021 Microsoft
4 */
5
6#include <linux/hyperv.h>
7
8#include <drm/drm_damage_helper.h>
9#include <drm/drm_drv.h>
10#include <drm/drm_edid.h>
11#include <drm/drm_format_helper.h>
12#include <drm/drm_fourcc.h>
13#include <drm/drm_framebuffer.h>
14#include <drm/drm_gem_atomic_helper.h>
15#include <drm/drm_gem_framebuffer_helper.h>
16#include <drm/drm_gem_shmem_helper.h>
17#include <drm/drm_probe_helper.h>
18#include <drm/drm_simple_kms_helper.h>
19
20#include "hyperv_drm.h"
21
22static int hyperv_blit_to_vram_rect(struct drm_framebuffer *fb,
23				    const struct iosys_map *vmap,
24				    struct drm_rect *rect)
25{
26	struct hyperv_drm_device *hv = to_hv(fb->dev);
27	struct iosys_map dst = IOSYS_MAP_INIT_VADDR_IOMEM(hv->vram);
28	int idx;
29
30	if (!drm_dev_enter(&hv->dev, &idx))
31		return -ENODEV;
32
33	iosys_map_incr(&dst, drm_fb_clip_offset(fb->pitches[0], fb->format, rect));
34	drm_fb_memcpy(&dst, fb->pitches, vmap, fb, rect);
35
36	drm_dev_exit(idx);
37
38	return 0;
39}
40
41static int hyperv_blit_to_vram_fullscreen(struct drm_framebuffer *fb,
42					  const struct iosys_map *map)
43{
44	struct drm_rect fullscreen = {
45		.x1 = 0,
46		.x2 = fb->width,
47		.y1 = 0,
48		.y2 = fb->height,
49	};
50	return hyperv_blit_to_vram_rect(fb, map, &fullscreen);
51}
52
53static int hyperv_connector_get_modes(struct drm_connector *connector)
54{
55	struct hyperv_drm_device *hv = to_hv(connector->dev);
56	int count;
57
58	count = drm_add_modes_noedid(connector,
59				     connector->dev->mode_config.max_width,
60				     connector->dev->mode_config.max_height);
61	drm_set_preferred_mode(connector, hv->preferred_width,
62			       hv->preferred_height);
63
64	return count;
65}
66
67static const struct drm_connector_helper_funcs hyperv_connector_helper_funcs = {
68	.get_modes = hyperv_connector_get_modes,
69};
70
71static const struct drm_connector_funcs hyperv_connector_funcs = {
72	.fill_modes = drm_helper_probe_single_connector_modes,
73	.destroy = drm_connector_cleanup,
74	.reset = drm_atomic_helper_connector_reset,
75	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
76	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
77};
78
79static inline int hyperv_conn_init(struct hyperv_drm_device *hv)
80{
81	drm_connector_helper_add(&hv->connector, &hyperv_connector_helper_funcs);
82	return drm_connector_init(&hv->dev, &hv->connector,
83				  &hyperv_connector_funcs,
84				  DRM_MODE_CONNECTOR_VIRTUAL);
85}
86
87static int hyperv_check_size(struct hyperv_drm_device *hv, int w, int h,
88			     struct drm_framebuffer *fb)
89{
90	u32 pitch = w * (hv->screen_depth / 8);
91
92	if (fb)
93		pitch = fb->pitches[0];
94
95	if (pitch * h > hv->fb_size)
96		return -EINVAL;
97
98	return 0;
99}
100
101static void hyperv_pipe_enable(struct drm_simple_display_pipe *pipe,
102			       struct drm_crtc_state *crtc_state,
103			       struct drm_plane_state *plane_state)
104{
105	struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
106	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
107
108	hyperv_hide_hw_ptr(hv->hdev);
109	hyperv_update_situation(hv->hdev, 1,  hv->screen_depth,
110				crtc_state->mode.hdisplay,
111				crtc_state->mode.vdisplay,
112				plane_state->fb->pitches[0]);
113	hyperv_blit_to_vram_fullscreen(plane_state->fb, &shadow_plane_state->data[0]);
114}
115
116static int hyperv_pipe_check(struct drm_simple_display_pipe *pipe,
117			     struct drm_plane_state *plane_state,
118			     struct drm_crtc_state *crtc_state)
119{
120	struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
121	struct drm_framebuffer *fb = plane_state->fb;
122
123	if (fb->format->format != DRM_FORMAT_XRGB8888)
124		return -EINVAL;
125
126	if (fb->pitches[0] * fb->height > hv->fb_size) {
127		drm_err(&hv->dev, "fb size requested by %s for %dX%d (pitch %d) greater than %ld\n",
128			current->comm, fb->width, fb->height, fb->pitches[0], hv->fb_size);
129		return -EINVAL;
130	}
131
132	return 0;
133}
134
135static void hyperv_pipe_update(struct drm_simple_display_pipe *pipe,
136			       struct drm_plane_state *old_state)
137{
138	struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
139	struct drm_plane_state *state = pipe->plane.state;
140	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
141	struct drm_rect rect;
142
143	if (drm_atomic_helper_damage_merged(old_state, state, &rect)) {
144		hyperv_blit_to_vram_rect(state->fb, &shadow_plane_state->data[0], &rect);
145		hyperv_update_dirt(hv->hdev, &rect);
146	}
147}
148
149static const struct drm_simple_display_pipe_funcs hyperv_pipe_funcs = {
150	.enable	= hyperv_pipe_enable,
151	.check = hyperv_pipe_check,
152	.update	= hyperv_pipe_update,
153	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
154};
155
156static const uint32_t hyperv_formats[] = {
157	DRM_FORMAT_XRGB8888,
158};
159
160static const uint64_t hyperv_modifiers[] = {
161	DRM_FORMAT_MOD_LINEAR,
162	DRM_FORMAT_MOD_INVALID
163};
164
165static inline int hyperv_pipe_init(struct hyperv_drm_device *hv)
166{
167	int ret;
168
169	ret = drm_simple_display_pipe_init(&hv->dev,
170					   &hv->pipe,
171					   &hyperv_pipe_funcs,
172					   hyperv_formats,
173					   ARRAY_SIZE(hyperv_formats),
174					   hyperv_modifiers,
175					   &hv->connector);
176	if (ret)
177		return ret;
178
179	drm_plane_enable_fb_damage_clips(&hv->pipe.plane);
180
181	return 0;
182}
183
184static enum drm_mode_status
185hyperv_mode_valid(struct drm_device *dev,
186		  const struct drm_display_mode *mode)
187{
188	struct hyperv_drm_device *hv = to_hv(dev);
189
190	if (hyperv_check_size(hv, mode->hdisplay, mode->vdisplay, NULL))
191		return MODE_BAD;
192
193	return MODE_OK;
194}
195
196static const struct drm_mode_config_funcs hyperv_mode_config_funcs = {
197	.fb_create = drm_gem_fb_create_with_dirty,
198	.mode_valid = hyperv_mode_valid,
199	.atomic_check = drm_atomic_helper_check,
200	.atomic_commit = drm_atomic_helper_commit,
201};
202
203int hyperv_mode_config_init(struct hyperv_drm_device *hv)
204{
205	struct drm_device *dev = &hv->dev;
206	int ret;
207
208	ret = drmm_mode_config_init(dev);
209	if (ret) {
210		drm_err(dev, "Failed to initialized mode setting.\n");
211		return ret;
212	}
213
214	dev->mode_config.min_width = 0;
215	dev->mode_config.min_height = 0;
216	dev->mode_config.max_width = hv->screen_width_max;
217	dev->mode_config.max_height = hv->screen_height_max;
218
219	dev->mode_config.preferred_depth = hv->screen_depth;
220	dev->mode_config.prefer_shadow = 0;
221
222	dev->mode_config.funcs = &hyperv_mode_config_funcs;
223
224	ret = hyperv_conn_init(hv);
225	if (ret) {
226		drm_err(dev, "Failed to initialized connector.\n");
227		return ret;
228	}
229
230	ret = hyperv_pipe_init(hv);
231	if (ret) {
232		drm_err(dev, "Failed to initialized pipe.\n");
233		return ret;
234	}
235
236	drm_mode_config_reset(dev);
237
238	return 0;
239}
240