tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_fb_helper.h>
12#include <drm/drm_format_helper.h>
13#include <drm/drm_fourcc.h>
14#include <drm/drm_framebuffer.h>
15#include <drm/drm_gem_atomic_helper.h>
16#include <drm/drm_gem_framebuffer_helper.h>
17#include <drm/drm_gem_shmem_helper.h>
18#include <drm/drm_probe_helper.h>
19#include <drm/drm_simple_kms_helper.h>
20
21#include "hyperv_drm.h"
22
23static int hyperv_blit_to_vram_rect(struct drm_framebuffer *fb,
24 const struct iosys_map *map,
25 struct drm_rect *rect)
26{
27 struct hyperv_drm_device *hv = to_hv(fb->dev);
28 void __iomem *dst = hv->vram;
29 void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
30 int idx;
31
32 if (!drm_dev_enter(&hv->dev, &idx))
33 return -ENODEV;
34
35 dst += drm_fb_clip_offset(fb->pitches[0], fb->format, rect);
36 drm_fb_memcpy_toio(dst, fb->pitches[0], vmap, fb, rect);
37
38 drm_dev_exit(idx);
39
40 return 0;
41}
42
43static int hyperv_blit_to_vram_fullscreen(struct drm_framebuffer *fb,
44 const struct iosys_map *map)
45{
46 struct drm_rect fullscreen = {
47 .x1 = 0,
48 .x2 = fb->width,
49 .y1 = 0,
50 .y2 = fb->height,
51 };
52 return hyperv_blit_to_vram_rect(fb, map, &fullscreen);
53}
54
55static int hyperv_connector_get_modes(struct drm_connector *connector)
56{
57 struct hyperv_drm_device *hv = to_hv(connector->dev);
58 int count;
59
60 count = drm_add_modes_noedid(connector,
61 connector->dev->mode_config.max_width,
62 connector->dev->mode_config.max_height);
63 drm_set_preferred_mode(connector, hv->preferred_width,
64 hv->preferred_height);
65
66 return count;
67}
68
69static const struct drm_connector_helper_funcs hyperv_connector_helper_funcs = {
70 .get_modes = hyperv_connector_get_modes,
71};
72
73static const struct drm_connector_funcs hyperv_connector_funcs = {
74 .fill_modes = drm_helper_probe_single_connector_modes,
75 .destroy = drm_connector_cleanup,
76 .reset = drm_atomic_helper_connector_reset,
77 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
78 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
79};
80
81static inline int hyperv_conn_init(struct hyperv_drm_device *hv)
82{
83 drm_connector_helper_add(&hv->connector, &hyperv_connector_helper_funcs);
84 return drm_connector_init(&hv->dev, &hv->connector,
85 &hyperv_connector_funcs,
86 DRM_MODE_CONNECTOR_VIRTUAL);
87}
88
89static int hyperv_check_size(struct hyperv_drm_device *hv, int w, int h,
90 struct drm_framebuffer *fb)
91{
92 u32 pitch = w * (hv->screen_depth / 8);
93
94 if (fb)
95 pitch = fb->pitches[0];
96
97 if (pitch * h > hv->fb_size)
98 return -EINVAL;
99
100 return 0;
101}
102
103static void hyperv_pipe_enable(struct drm_simple_display_pipe *pipe,
104 struct drm_crtc_state *crtc_state,
105 struct drm_plane_state *plane_state)
106{
107 struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
108 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
109
110 hyperv_hide_hw_ptr(hv->hdev);
111 hyperv_update_situation(hv->hdev, 1, hv->screen_depth,
112 crtc_state->mode.hdisplay,
113 crtc_state->mode.vdisplay,
114 plane_state->fb->pitches[0]);
115 hyperv_blit_to_vram_fullscreen(plane_state->fb, &shadow_plane_state->data[0]);
116}
117
118static int hyperv_pipe_check(struct drm_simple_display_pipe *pipe,
119 struct drm_plane_state *plane_state,
120 struct drm_crtc_state *crtc_state)
121{
122 struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
123 struct drm_framebuffer *fb = plane_state->fb;
124
125 if (fb->format->format != DRM_FORMAT_XRGB8888)
126 return -EINVAL;
127
128 if (fb->pitches[0] * fb->height > hv->fb_size) {
129 drm_err(&hv->dev, "fb size requested by %s for %dX%d (pitch %d) greater than %ld\n",
130 current->comm, fb->width, fb->height, fb->pitches[0], hv->fb_size);
131 return -EINVAL;
132 }
133
134 return 0;
135}
136
137static void hyperv_pipe_update(struct drm_simple_display_pipe *pipe,
138 struct drm_plane_state *old_state)
139{
140 struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
141 struct drm_plane_state *state = pipe->plane.state;
142 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
143 struct drm_rect rect;
144
145 if (drm_atomic_helper_damage_merged(old_state, state, &rect)) {
146 hyperv_blit_to_vram_rect(state->fb, &shadow_plane_state->data[0], &rect);
147 hyperv_update_dirt(hv->hdev, &rect);
148 }
149}
150
151static const struct drm_simple_display_pipe_funcs hyperv_pipe_funcs = {
152 .enable = hyperv_pipe_enable,
153 .check = hyperv_pipe_check,
154 .update = hyperv_pipe_update,
155 DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
156};
157
158static const uint32_t hyperv_formats[] = {
159 DRM_FORMAT_XRGB8888,
160};
161
162static const uint64_t hyperv_modifiers[] = {
163 DRM_FORMAT_MOD_LINEAR,
164 DRM_FORMAT_MOD_INVALID
165};
166
167static inline int hyperv_pipe_init(struct hyperv_drm_device *hv)
168{
169 int ret;
170
171 ret = drm_simple_display_pipe_init(&hv->dev,
172 &hv->pipe,
173 &hyperv_pipe_funcs,
174 hyperv_formats,
175 ARRAY_SIZE(hyperv_formats),
176 hyperv_modifiers,
177 &hv->connector);
178 if (ret)
179 return ret;
180
181 drm_plane_enable_fb_damage_clips(&hv->pipe.plane);
182
183 return 0;
184}
185
186static enum drm_mode_status
187hyperv_mode_valid(struct drm_device *dev,
188 const struct drm_display_mode *mode)
189{
190 struct hyperv_drm_device *hv = to_hv(dev);
191
192 if (hyperv_check_size(hv, mode->hdisplay, mode->vdisplay, NULL))
193 return MODE_BAD;
194
195 return MODE_OK;
196}
197
198static const struct drm_mode_config_funcs hyperv_mode_config_funcs = {
199 .fb_create = drm_gem_fb_create_with_dirty,
200 .mode_valid = hyperv_mode_valid,
201 .atomic_check = drm_atomic_helper_check,
202 .atomic_commit = drm_atomic_helper_commit,
203};
204
205int hyperv_mode_config_init(struct hyperv_drm_device *hv)
206{
207 struct drm_device *dev = &hv->dev;
208 int ret;
209
210 ret = drmm_mode_config_init(dev);
211 if (ret) {
212 drm_err(dev, "Failed to initialized mode setting.\n");
213 return ret;
214 }
215
216 dev->mode_config.min_width = 0;
217 dev->mode_config.min_height = 0;
218 dev->mode_config.max_width = hv->screen_width_max;
219 dev->mode_config.max_height = hv->screen_height_max;
220
221 dev->mode_config.preferred_depth = hv->screen_depth;
222 dev->mode_config.prefer_shadow = 0;
223
224 dev->mode_config.funcs = &hyperv_mode_config_funcs;
225
226 ret = hyperv_conn_init(hv);
227 if (ret) {
228 drm_err(dev, "Failed to initialized connector.\n");
229 return ret;
230 }
231
232 ret = hyperv_pipe_init(hv);
233 if (ret) {
234 drm_err(dev, "Failed to initialized pipe.\n");
235 return ret;
236 }
237
238 drm_mode_config_reset(dev);
239
240 return 0;
241}