1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2016-2018, 2020-2021 The Linux Foundation. All rights reserved.
4 * Copyright (C) 2013 Red Hat
5 * Author: Rob Clark <robdclark@gmail.com>
6 */
7
8 #include <linux/aperture.h>
9 #include <linux/kthread.h>
10 #include <linux/sched/mm.h>
11 #include <uapi/linux/sched/types.h>
12
13 #include <drm/drm_drv.h>
14 #include <drm/drm_mode_config.h>
15 #include <drm/drm_vblank.h>
16
17 #include "disp/msm_disp_snapshot.h"
18 #include "msm_drv.h"
19 #include "msm_gem.h"
20 #include "msm_kms.h"
21 #include "msm_mmu.h"
22
23 static const struct drm_mode_config_funcs mode_config_funcs = {
24 .fb_create = msm_framebuffer_create,
25 .atomic_check = msm_atomic_check,
26 .atomic_commit = drm_atomic_helper_commit,
27 };
28
29 static const struct drm_mode_config_helper_funcs mode_config_helper_funcs = {
30 .atomic_commit_tail = msm_atomic_commit_tail,
31 };
32
msm_irq(int irq,void * arg)33 static irqreturn_t msm_irq(int irq, void *arg)
34 {
35 struct drm_device *dev = arg;
36 struct msm_drm_private *priv = dev->dev_private;
37 struct msm_kms *kms = priv->kms;
38
39 BUG_ON(!kms);
40
41 return kms->funcs->irq(kms);
42 }
43
msm_irq_preinstall(struct drm_device * dev)44 static void msm_irq_preinstall(struct drm_device *dev)
45 {
46 struct msm_drm_private *priv = dev->dev_private;
47 struct msm_kms *kms = priv->kms;
48
49 BUG_ON(!kms);
50
51 kms->funcs->irq_preinstall(kms);
52 }
53
msm_irq_postinstall(struct drm_device * dev)54 static int msm_irq_postinstall(struct drm_device *dev)
55 {
56 struct msm_drm_private *priv = dev->dev_private;
57 struct msm_kms *kms = priv->kms;
58
59 BUG_ON(!kms);
60
61 if (kms->funcs->irq_postinstall)
62 return kms->funcs->irq_postinstall(kms);
63
64 return 0;
65 }
66
msm_irq_install(struct drm_device * dev,unsigned int irq)67 static int msm_irq_install(struct drm_device *dev, unsigned int irq)
68 {
69 struct msm_drm_private *priv = dev->dev_private;
70 struct msm_kms *kms = priv->kms;
71 int ret;
72
73 if (irq == IRQ_NOTCONNECTED)
74 return -ENOTCONN;
75
76 msm_irq_preinstall(dev);
77
78 ret = request_irq(irq, msm_irq, 0, dev->driver->name, dev);
79 if (ret)
80 return ret;
81
82 kms->irq_requested = true;
83
84 ret = msm_irq_postinstall(dev);
85 if (ret) {
86 free_irq(irq, dev);
87 return ret;
88 }
89
90 return 0;
91 }
92
msm_irq_uninstall(struct drm_device * dev)93 static void msm_irq_uninstall(struct drm_device *dev)
94 {
95 struct msm_drm_private *priv = dev->dev_private;
96 struct msm_kms *kms = priv->kms;
97
98 kms->funcs->irq_uninstall(kms);
99 if (kms->irq_requested)
100 free_irq(kms->irq, dev);
101 }
102
103 struct msm_vblank_work {
104 struct work_struct work;
105 struct drm_crtc *crtc;
106 bool enable;
107 struct msm_drm_private *priv;
108 };
109
vblank_ctrl_worker(struct work_struct * work)110 static void vblank_ctrl_worker(struct work_struct *work)
111 {
112 struct msm_vblank_work *vbl_work = container_of(work,
113 struct msm_vblank_work, work);
114 struct msm_drm_private *priv = vbl_work->priv;
115 struct msm_kms *kms = priv->kms;
116
117 if (vbl_work->enable)
118 kms->funcs->enable_vblank(kms, vbl_work->crtc);
119 else
120 kms->funcs->disable_vblank(kms, vbl_work->crtc);
121
122 kfree(vbl_work);
123 }
124
vblank_ctrl_queue_work(struct msm_drm_private * priv,struct drm_crtc * crtc,bool enable)125 static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
126 struct drm_crtc *crtc, bool enable)
127 {
128 struct msm_vblank_work *vbl_work;
129
130 vbl_work = kzalloc(sizeof(*vbl_work), GFP_ATOMIC);
131 if (!vbl_work)
132 return -ENOMEM;
133
134 INIT_WORK(&vbl_work->work, vblank_ctrl_worker);
135
136 vbl_work->crtc = crtc;
137 vbl_work->enable = enable;
138 vbl_work->priv = priv;
139
140 queue_work(priv->wq, &vbl_work->work);
141
142 return 0;
143 }
144
msm_crtc_enable_vblank(struct drm_crtc * crtc)145 int msm_crtc_enable_vblank(struct drm_crtc *crtc)
146 {
147 struct drm_device *dev = crtc->dev;
148 struct msm_drm_private *priv = dev->dev_private;
149 struct msm_kms *kms = priv->kms;
150 if (!kms)
151 return -ENXIO;
152 drm_dbg_vbl(dev, "crtc=%u\n", crtc->base.id);
153 return vblank_ctrl_queue_work(priv, crtc, true);
154 }
155
msm_crtc_disable_vblank(struct drm_crtc * crtc)156 void msm_crtc_disable_vblank(struct drm_crtc *crtc)
157 {
158 struct drm_device *dev = crtc->dev;
159 struct msm_drm_private *priv = dev->dev_private;
160 struct msm_kms *kms = priv->kms;
161 if (!kms)
162 return;
163 drm_dbg_vbl(dev, "crtc=%u\n", crtc->base.id);
164 vblank_ctrl_queue_work(priv, crtc, false);
165 }
166
msm_kms_fault_handler(void * arg,unsigned long iova,int flags,void * data)167 static int msm_kms_fault_handler(void *arg, unsigned long iova, int flags, void *data)
168 {
169 struct msm_kms *kms = arg;
170
171 if (atomic_read(&kms->fault_snapshot_capture) == 0) {
172 msm_disp_snapshot_state(kms->dev);
173 atomic_inc(&kms->fault_snapshot_capture);
174 }
175
176 return -ENOSYS;
177 }
178
msm_kms_init_aspace(struct drm_device * dev)179 struct msm_gem_address_space *msm_kms_init_aspace(struct drm_device *dev)
180 {
181 struct msm_gem_address_space *aspace;
182 struct msm_mmu *mmu;
183 struct device *mdp_dev = dev->dev;
184 struct device *mdss_dev = mdp_dev->parent;
185 struct msm_drm_private *priv = dev->dev_private;
186 struct msm_kms *kms = priv->kms;
187 struct device *iommu_dev;
188
189 /*
190 * IOMMUs can be a part of MDSS device tree binding, or the
191 * MDP/DPU device.
192 */
193 if (device_iommu_mapped(mdp_dev))
194 iommu_dev = mdp_dev;
195 else
196 iommu_dev = mdss_dev;
197
198 mmu = msm_iommu_disp_new(iommu_dev, 0);
199 if (IS_ERR(mmu))
200 return ERR_CAST(mmu);
201
202 if (!mmu) {
203 drm_info(dev, "no IOMMU, fallback to phys contig buffers for scanout\n");
204 return NULL;
205 }
206
207 aspace = msm_gem_address_space_create(mmu, "mdp_kms",
208 0x1000, 0x100000000 - 0x1000);
209 if (IS_ERR(aspace)) {
210 dev_err(mdp_dev, "aspace create, error %pe\n", aspace);
211 mmu->funcs->destroy(mmu);
212 return aspace;
213 }
214
215 msm_mmu_set_fault_handler(aspace->mmu, kms, msm_kms_fault_handler);
216
217 return aspace;
218 }
219
msm_drm_kms_uninit(struct device * dev)220 void msm_drm_kms_uninit(struct device *dev)
221 {
222 struct platform_device *pdev = to_platform_device(dev);
223 struct msm_drm_private *priv = platform_get_drvdata(pdev);
224 struct drm_device *ddev = priv->dev;
225 struct msm_kms *kms = priv->kms;
226 int i;
227
228 BUG_ON(!kms);
229
230 /* clean up event worker threads */
231 for (i = 0; i < priv->num_crtcs; i++) {
232 if (priv->event_thread[i].worker)
233 kthread_destroy_worker(priv->event_thread[i].worker);
234 }
235
236 drm_kms_helper_poll_fini(ddev);
237
238 msm_disp_snapshot_destroy(ddev);
239
240 pm_runtime_get_sync(dev);
241 msm_irq_uninstall(ddev);
242 pm_runtime_put_sync(dev);
243
244 if (kms && kms->funcs)
245 kms->funcs->destroy(kms);
246 }
247
msm_drm_kms_init(struct device * dev,const struct drm_driver * drv)248 int msm_drm_kms_init(struct device *dev, const struct drm_driver *drv)
249 {
250 struct msm_drm_private *priv = dev_get_drvdata(dev);
251 struct drm_device *ddev = priv->dev;
252 struct msm_kms *kms = priv->kms;
253 struct drm_crtc *crtc;
254 int ret;
255
256 /* the fw fb could be anywhere in memory */
257 ret = aperture_remove_all_conflicting_devices(drv->name);
258 if (ret)
259 return ret;
260
261 ret = priv->kms_init(ddev);
262 if (ret) {
263 DRM_DEV_ERROR(dev, "failed to load kms\n");
264 return ret;
265 }
266
267 /* Enable normalization of plane zpos */
268 ddev->mode_config.normalize_zpos = true;
269
270 ddev->mode_config.funcs = &mode_config_funcs;
271 ddev->mode_config.helper_private = &mode_config_helper_funcs;
272
273 kms->dev = ddev;
274 ret = kms->funcs->hw_init(kms);
275 if (ret) {
276 DRM_DEV_ERROR(dev, "kms hw init failed: %d\n", ret);
277 goto err_msm_uninit;
278 }
279
280 drm_helper_move_panel_connectors_to_head(ddev);
281
282 drm_for_each_crtc(crtc, ddev) {
283 struct msm_drm_thread *ev_thread;
284
285 /* initialize event thread */
286 ev_thread = &priv->event_thread[drm_crtc_index(crtc)];
287 ev_thread->dev = ddev;
288 ev_thread->worker = kthread_run_worker(0, "crtc_event:%d", crtc->base.id);
289 if (IS_ERR(ev_thread->worker)) {
290 ret = PTR_ERR(ev_thread->worker);
291 DRM_DEV_ERROR(dev, "failed to create crtc_event kthread\n");
292 ev_thread->worker = NULL;
293 goto err_msm_uninit;
294 }
295
296 sched_set_fifo(ev_thread->worker->task);
297 }
298
299 ret = drm_vblank_init(ddev, priv->num_crtcs);
300 if (ret < 0) {
301 DRM_DEV_ERROR(dev, "failed to initialize vblank\n");
302 goto err_msm_uninit;
303 }
304
305 pm_runtime_get_sync(dev);
306 ret = msm_irq_install(ddev, kms->irq);
307 pm_runtime_put_sync(dev);
308 if (ret < 0) {
309 DRM_DEV_ERROR(dev, "failed to install IRQ handler\n");
310 goto err_msm_uninit;
311 }
312
313 ret = msm_disp_snapshot_init(ddev);
314 if (ret)
315 DRM_DEV_ERROR(dev, "msm_disp_snapshot_init failed ret = %d\n", ret);
316
317 drm_mode_config_reset(ddev);
318
319 return 0;
320
321 err_msm_uninit:
322 return ret;
323 }
324
msm_kms_pm_prepare(struct device * dev)325 int msm_kms_pm_prepare(struct device *dev)
326 {
327 struct msm_drm_private *priv = dev_get_drvdata(dev);
328 struct drm_device *ddev = priv ? priv->dev : NULL;
329
330 if (!priv || !priv->kms)
331 return 0;
332
333 return drm_mode_config_helper_suspend(ddev);
334 }
335
msm_kms_pm_complete(struct device * dev)336 void msm_kms_pm_complete(struct device *dev)
337 {
338 struct msm_drm_private *priv = dev_get_drvdata(dev);
339 struct drm_device *ddev = priv ? priv->dev : NULL;
340
341 if (!priv || !priv->kms)
342 return;
343
344 drm_mode_config_helper_resume(ddev);
345 }
346
msm_kms_shutdown(struct platform_device * pdev)347 void msm_kms_shutdown(struct platform_device *pdev)
348 {
349 struct msm_drm_private *priv = platform_get_drvdata(pdev);
350 struct drm_device *drm = priv ? priv->dev : NULL;
351
352 /*
353 * Shutdown the hw if we're far enough along where things might be on.
354 * If we run this too early, we'll end up panicking in any variety of
355 * places. Since we don't register the drm device until late in
356 * msm_drm_init, drm_dev->registered is used as an indicator that the
357 * shutdown will be successful.
358 */
359 if (drm && drm->registered && priv->kms)
360 drm_atomic_helper_shutdown(drm);
361 }
362