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(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
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, vmap: map, rect: &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 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
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(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
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(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
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: &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
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(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
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, w: mode->hdisplay, h: 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

source code of linux/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c