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 | |
22 | static 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(dev: &hv->dev, idx: &idx)) |
31 | return -ENODEV; |
32 | |
33 | iosys_map_incr(map: &dst, incr: drm_fb_clip_offset(pitch: fb->pitches[0], format: fb->format, clip: rect)); |
34 | drm_fb_memcpy(dst: &dst, dst_pitch: fb->pitches, src: vmap, fb, clip: rect); |
35 | |
36 | drm_dev_exit(idx); |
37 | |
38 | return 0; |
39 | } |
40 | |
41 | static 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, vmap: map, rect: &fullscreen); |
51 | } |
52 | |
53 | static 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 | hdisplay: connector->dev->mode_config.max_width, |
60 | vdisplay: connector->dev->mode_config.max_height); |
61 | drm_set_preferred_mode(connector, hpref: hv->preferred_width, |
62 | vpref: hv->preferred_height); |
63 | |
64 | return count; |
65 | } |
66 | |
67 | static const struct drm_connector_helper_funcs hyperv_connector_helper_funcs = { |
68 | .get_modes = hyperv_connector_get_modes, |
69 | }; |
70 | |
71 | static 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 | |
79 | static inline int hyperv_conn_init(struct hyperv_drm_device *hv) |
80 | { |
81 | drm_connector_helper_add(connector: &hv->connector, funcs: &hyperv_connector_helper_funcs); |
82 | return drm_connector_init(dev: &hv->dev, connector: &hv->connector, |
83 | funcs: &hyperv_connector_funcs, |
84 | DRM_MODE_CONNECTOR_VIRTUAL); |
85 | } |
86 | |
87 | static 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 | |
101 | static 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(state: plane_state); |
107 | |
108 | hyperv_hide_hw_ptr(hdev: hv->hdev); |
109 | hyperv_update_situation(hdev: hv->hdev, active: 1, bpp: hv->screen_depth, |
110 | w: crtc_state->mode.hdisplay, |
111 | h: crtc_state->mode.vdisplay, |
112 | pitch: plane_state->fb->pitches[0]); |
113 | hyperv_blit_to_vram_fullscreen(fb: plane_state->fb, map: &shadow_plane_state->data[0]); |
114 | } |
115 | |
116 | static 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 | |
135 | static 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: &rect)) { |
144 | hyperv_blit_to_vram_rect(fb: state->fb, vmap: &shadow_plane_state->data[0], rect: &rect); |
145 | hyperv_update_dirt(hdev: hv->hdev, rect: &rect); |
146 | } |
147 | } |
148 | |
149 | static 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 | |
156 | static const uint32_t hyperv_formats[] = { |
157 | DRM_FORMAT_XRGB8888, |
158 | }; |
159 | |
160 | static const uint64_t hyperv_modifiers[] = { |
161 | DRM_FORMAT_MOD_LINEAR, |
162 | DRM_FORMAT_MOD_INVALID |
163 | }; |
164 | |
165 | static inline int hyperv_pipe_init(struct hyperv_drm_device *hv) |
166 | { |
167 | int ret; |
168 | |
169 | ret = drm_simple_display_pipe_init(dev: &hv->dev, |
170 | pipe: &hv->pipe, |
171 | funcs: &hyperv_pipe_funcs, |
172 | formats: hyperv_formats, |
173 | ARRAY_SIZE(hyperv_formats), |
174 | format_modifiers: hyperv_modifiers, |
175 | connector: &hv->connector); |
176 | if (ret) |
177 | return ret; |
178 | |
179 | drm_plane_enable_fb_damage_clips(plane: &hv->pipe.plane); |
180 | |
181 | return 0; |
182 | } |
183 | |
184 | static enum drm_mode_status |
185 | hyperv_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, w: mode->hdisplay, h: mode->vdisplay, NULL)) |
191 | return MODE_BAD; |
192 | |
193 | return MODE_OK; |
194 | } |
195 | |
196 | static 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 | |
203 | int 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 | |