Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/iosys-map.h>
4
5#include <drm/drm_atomic.h>
6#include <drm/drm_edid.h>
7#include <drm/drm_fourcc.h>
8#include <drm/drm_writeback.h>
9#include <drm/drm_print.h>
10#include <drm/drm_probe_helper.h>
11#include <drm/drm_atomic_helper.h>
12#include <drm/drm_gem_framebuffer_helper.h>
13#include <drm/drm_gem_shmem_helper.h>
14
15#include "vkms_drv.h"
16#include "vkms_formats.h"
17
18static const u32 vkms_wb_formats[] = {
19 DRM_FORMAT_ARGB8888,
20 DRM_FORMAT_XRGB8888,
21 DRM_FORMAT_ABGR8888,
22 DRM_FORMAT_XRGB16161616,
23 DRM_FORMAT_ARGB16161616,
24 DRM_FORMAT_RGB565
25};
26
27static const struct drm_connector_funcs vkms_wb_connector_funcs = {
28 .fill_modes = drm_helper_probe_single_connector_modes,
29 .reset = drm_atomic_helper_connector_reset,
30 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
31 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
32};
33
34static int vkms_wb_atomic_check(struct drm_connector *connector,
35 struct drm_atomic_state *state)
36{
37 struct drm_connector_state *conn_state =
38 drm_atomic_get_new_connector_state(state, connector);
39 struct drm_crtc_state *crtc_state;
40 struct drm_framebuffer *fb;
41 const struct drm_display_mode *mode;
42 int ret;
43
44 if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
45 return 0;
46
47 if (!conn_state->crtc)
48 return 0;
49
50 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
51 mode = &crtc_state->mode;
52
53 fb = conn_state->writeback_job->fb;
54 if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
55 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
56 fb->width, fb->height);
57 return -EINVAL;
58 }
59
60 ret = drm_atomic_helper_check_wb_connector_state(connector, state);
61 if (ret < 0)
62 return ret;
63
64 return 0;
65}
66
67static int vkms_wb_connector_get_modes(struct drm_connector *connector)
68{
69 struct drm_device *dev = connector->dev;
70
71 return drm_add_modes_noedid(connector, dev->mode_config.max_width,
72 dev->mode_config.max_height);
73}
74
75static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
76 struct drm_writeback_job *job)
77{
78 struct vkms_writeback_job *vkmsjob;
79 int ret;
80
81 if (!job->fb)
82 return 0;
83
84 vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL);
85 if (!vkmsjob)
86 return -ENOMEM;
87
88 ret = drm_gem_fb_vmap(job->fb, vkmsjob->wb_frame_info.map, vkmsjob->data);
89 if (ret) {
90 DRM_ERROR("vmap failed: %d\n", ret);
91 goto err_kfree;
92 }
93
94 vkmsjob->wb_frame_info.fb = job->fb;
95 drm_framebuffer_get(vkmsjob->wb_frame_info.fb);
96
97 job->priv = vkmsjob;
98
99 return 0;
100
101err_kfree:
102 kfree(vkmsjob);
103 return ret;
104}
105
106static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
107 struct drm_writeback_job *job)
108{
109 struct vkms_writeback_job *vkmsjob = job->priv;
110 struct vkms_output *vkms_output = container_of(connector,
111 struct vkms_output,
112 wb_connector);
113
114 if (!job->fb)
115 return;
116
117 drm_gem_fb_vunmap(job->fb, vkmsjob->wb_frame_info.map);
118
119 drm_framebuffer_put(vkmsjob->wb_frame_info.fb);
120
121 vkms_set_composer(vkms_output, false);
122 kfree(vkmsjob);
123}
124
125static void vkms_wb_atomic_commit(struct drm_connector *conn,
126 struct drm_atomic_state *state)
127{
128 struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
129 conn);
130 struct vkms_output *output = drm_crtc_to_vkms_output(connector_state->crtc);
131 struct drm_writeback_connector *wb_conn = &output->wb_connector;
132 struct drm_connector_state *conn_state = wb_conn->base.state;
133 struct vkms_crtc_state *crtc_state = output->composer_state;
134 struct drm_framebuffer *fb = connector_state->writeback_job->fb;
135 u16 crtc_height = crtc_state->base.mode.vdisplay;
136 u16 crtc_width = crtc_state->base.mode.hdisplay;
137 struct vkms_writeback_job *active_wb;
138 struct vkms_frame_info *wb_frame_info;
139 u32 wb_format = fb->format->format;
140
141 if (!conn_state)
142 return;
143
144 vkms_set_composer(output, true);
145
146 active_wb = conn_state->writeback_job->priv;
147 wb_frame_info = &active_wb->wb_frame_info;
148
149 spin_lock_irq(&output->composer_lock);
150 crtc_state->active_writeback = active_wb;
151 crtc_state->wb_pending = true;
152 spin_unlock_irq(&output->composer_lock);
153 drm_writeback_queue_job(wb_conn, connector_state);
154 active_wb->pixel_write = get_pixel_write_function(wb_format);
155 drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height);
156 drm_rect_init(&wb_frame_info->dst, 0, 0, crtc_width, crtc_height);
157}
158
159static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
160 .get_modes = vkms_wb_connector_get_modes,
161 .prepare_writeback_job = vkms_wb_prepare_job,
162 .cleanup_writeback_job = vkms_wb_cleanup_job,
163 .atomic_commit = vkms_wb_atomic_commit,
164 .atomic_check = vkms_wb_atomic_check,
165};
166
167int vkms_enable_writeback_connector(struct vkms_device *vkmsdev,
168 struct vkms_output *vkms_output)
169{
170 struct drm_writeback_connector *wb = &vkms_output->wb_connector;
171 int ret;
172
173 ret = drmm_encoder_init(&vkmsdev->drm, &vkms_output->wb_encoder,
174 NULL, DRM_MODE_ENCODER_VIRTUAL, NULL);
175 if (ret)
176 return ret;
177 vkms_output->wb_encoder.possible_crtcs |= drm_crtc_mask(&vkms_output->crtc);
178 vkms_output->wb_encoder.possible_clones |=
179 drm_encoder_mask(&vkms_output->wb_encoder);
180
181 drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
182
183 return drmm_writeback_connector_init(&vkmsdev->drm, wb,
184 &vkms_wb_connector_funcs,
185 &vkms_output->wb_encoder,
186 vkms_wb_formats,
187 ARRAY_SIZE(vkms_wb_formats));
188}