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 #include <drm/clients/drm_client_setup.h> 17 18 #include "disp/msm_disp_snapshot.h" 19 #include "msm_drv.h" 20 #include "msm_gem.h" 21 #include "msm_kms.h" 22 #include "msm_mmu.h" 23 24 static const struct drm_mode_config_funcs mode_config_funcs = { 25 .fb_create = msm_framebuffer_create, 26 .atomic_check = msm_atomic_check, 27 .atomic_commit = drm_atomic_helper_commit, 28 }; 29 30 static const struct drm_mode_config_helper_funcs mode_config_helper_funcs = { 31 .atomic_commit_tail = msm_atomic_commit_tail, 32 }; 33 34 static irqreturn_t msm_irq(int irq, void *arg) 35 { 36 struct drm_device *dev = arg; 37 struct msm_drm_private *priv = dev->dev_private; 38 struct msm_kms *kms = priv->kms; 39 40 BUG_ON(!kms); 41 42 return kms->funcs->irq(kms); 43 } 44 45 static void msm_irq_preinstall(struct drm_device *dev) 46 { 47 struct msm_drm_private *priv = dev->dev_private; 48 struct msm_kms *kms = priv->kms; 49 50 BUG_ON(!kms); 51 52 kms->funcs->irq_preinstall(kms); 53 } 54 55 static int msm_irq_postinstall(struct drm_device *dev) 56 { 57 struct msm_drm_private *priv = dev->dev_private; 58 struct msm_kms *kms = priv->kms; 59 60 BUG_ON(!kms); 61 62 if (kms->funcs->irq_postinstall) 63 return kms->funcs->irq_postinstall(kms); 64 65 return 0; 66 } 67 68 static int msm_irq_install(struct drm_device *dev, unsigned int irq) 69 { 70 struct msm_drm_private *priv = dev->dev_private; 71 struct msm_kms *kms = priv->kms; 72 int ret; 73 74 if (irq == IRQ_NOTCONNECTED) 75 return -ENOTCONN; 76 77 msm_irq_preinstall(dev); 78 79 ret = request_irq(irq, msm_irq, 0, dev->driver->name, dev); 80 if (ret) 81 return ret; 82 83 kms->irq_requested = true; 84 85 ret = msm_irq_postinstall(dev); 86 if (ret) { 87 free_irq(irq, dev); 88 return ret; 89 } 90 91 return 0; 92 } 93 94 static void msm_irq_uninstall(struct drm_device *dev) 95 { 96 struct msm_drm_private *priv = dev->dev_private; 97 struct msm_kms *kms = priv->kms; 98 99 kms->funcs->irq_uninstall(kms); 100 if (kms->irq_requested) 101 free_irq(kms->irq, dev); 102 } 103 104 struct msm_vblank_work { 105 struct work_struct work; 106 struct drm_crtc *crtc; 107 bool enable; 108 struct msm_drm_private *priv; 109 }; 110 111 static void vblank_ctrl_worker(struct work_struct *work) 112 { 113 struct msm_vblank_work *vbl_work = container_of(work, 114 struct msm_vblank_work, work); 115 struct msm_drm_private *priv = vbl_work->priv; 116 struct msm_kms *kms = priv->kms; 117 118 if (vbl_work->enable) 119 kms->funcs->enable_vblank(kms, vbl_work->crtc); 120 else 121 kms->funcs->disable_vblank(kms, vbl_work->crtc); 122 123 kfree(vbl_work); 124 } 125 126 static int vblank_ctrl_queue_work(struct msm_drm_private *priv, 127 struct drm_crtc *crtc, bool enable) 128 { 129 struct msm_vblank_work *vbl_work; 130 131 vbl_work = kzalloc(sizeof(*vbl_work), GFP_ATOMIC); 132 if (!vbl_work) 133 return -ENOMEM; 134 135 INIT_WORK(&vbl_work->work, vblank_ctrl_worker); 136 137 vbl_work->crtc = crtc; 138 vbl_work->enable = enable; 139 vbl_work->priv = priv; 140 141 queue_work(priv->kms->wq, &vbl_work->work); 142 143 return 0; 144 } 145 146 int msm_crtc_enable_vblank(struct drm_crtc *crtc) 147 { 148 struct drm_device *dev = crtc->dev; 149 struct msm_drm_private *priv = dev->dev_private; 150 struct msm_kms *kms = priv->kms; 151 if (!kms) 152 return -ENXIO; 153 drm_dbg_vbl(dev, "crtc=%u\n", crtc->base.id); 154 return vblank_ctrl_queue_work(priv, crtc, true); 155 } 156 157 void msm_crtc_disable_vblank(struct drm_crtc *crtc) 158 { 159 struct drm_device *dev = crtc->dev; 160 struct msm_drm_private *priv = dev->dev_private; 161 struct msm_kms *kms = priv->kms; 162 if (!kms) 163 return; 164 drm_dbg_vbl(dev, "crtc=%u\n", crtc->base.id); 165 vblank_ctrl_queue_work(priv, crtc, false); 166 } 167 168 static int msm_kms_fault_handler(void *arg, unsigned long iova, int flags, void *data) 169 { 170 struct msm_kms *kms = arg; 171 172 if (atomic_read(&kms->fault_snapshot_capture) == 0) { 173 msm_disp_snapshot_state(kms->dev); 174 atomic_inc(&kms->fault_snapshot_capture); 175 } 176 177 return -ENOSYS; 178 } 179 180 struct drm_gpuvm *msm_kms_init_vm(struct drm_device *dev) 181 { 182 struct drm_gpuvm *vm; 183 struct msm_mmu *mmu; 184 struct device *mdp_dev = dev->dev; 185 struct device *mdss_dev = mdp_dev->parent; 186 struct msm_drm_private *priv = dev->dev_private; 187 struct msm_kms *kms = priv->kms; 188 struct device *iommu_dev; 189 190 /* 191 * IOMMUs can be a part of MDSS device tree binding, or the 192 * MDP/DPU device. 193 */ 194 if (device_iommu_mapped(mdp_dev)) 195 iommu_dev = mdp_dev; 196 else 197 iommu_dev = mdss_dev; 198 199 mmu = msm_iommu_disp_new(iommu_dev, 0); 200 if (IS_ERR(mmu)) 201 return ERR_CAST(mmu); 202 203 if (!mmu) { 204 drm_info(dev, "no IOMMU, fallback to phys contig buffers for scanout\n"); 205 return NULL; 206 } 207 208 vm = msm_gem_vm_create(dev, mmu, "mdp_kms", 209 0x1000, 0x100000000 - 0x1000, true); 210 if (IS_ERR(vm)) { 211 dev_err(mdp_dev, "vm create, error %pe\n", vm); 212 mmu->funcs->destroy(mmu); 213 return vm; 214 } 215 216 msm_mmu_set_fault_handler(to_msm_vm(vm)->mmu, kms, msm_kms_fault_handler); 217 218 return vm; 219 } 220 221 void msm_drm_kms_unregister(struct device *dev) 222 { 223 struct platform_device *pdev = to_platform_device(dev); 224 struct msm_drm_private *priv = platform_get_drvdata(pdev); 225 struct drm_device *ddev = priv->dev; 226 227 drm_atomic_helper_shutdown(ddev); 228 } 229 230 void msm_drm_kms_uninit(struct device *dev) 231 { 232 struct platform_device *pdev = to_platform_device(dev); 233 struct msm_drm_private *priv = platform_get_drvdata(pdev); 234 struct drm_device *ddev = priv->dev; 235 struct msm_kms *kms = priv->kms; 236 int i; 237 238 BUG_ON(!kms); 239 240 /* We must cancel and cleanup any pending vblank enable/disable 241 * work before msm_irq_uninstall() to avoid work re-enabling an 242 * irq after uninstall has disabled it. 243 */ 244 245 flush_workqueue(kms->wq); 246 247 /* clean up event worker threads */ 248 for (i = 0; i < MAX_CRTCS; i++) { 249 if (kms->event_thread[i].worker) 250 kthread_destroy_worker(kms->event_thread[i].worker); 251 } 252 253 drm_kms_helper_poll_fini(ddev); 254 255 msm_disp_snapshot_destroy(ddev); 256 257 pm_runtime_get_sync(dev); 258 msm_irq_uninstall(ddev); 259 pm_runtime_put_sync(dev); 260 261 if (kms && kms->funcs) 262 kms->funcs->destroy(kms); 263 } 264 265 int msm_drm_kms_init(struct device *dev, const struct drm_driver *drv) 266 { 267 struct msm_drm_private *priv = dev_get_drvdata(dev); 268 struct drm_device *ddev = priv->dev; 269 struct msm_kms *kms = priv->kms; 270 struct drm_crtc *crtc; 271 int ret; 272 273 /* the fw fb could be anywhere in memory */ 274 ret = aperture_remove_all_conflicting_devices(drv->name); 275 if (ret) 276 return ret; 277 278 ret = priv->kms_init(ddev); 279 if (ret) { 280 DRM_DEV_ERROR(dev, "failed to load kms\n"); 281 goto err_msm_uninit; 282 } 283 284 /* Enable normalization of plane zpos */ 285 ddev->mode_config.normalize_zpos = true; 286 287 ddev->mode_config.funcs = &mode_config_funcs; 288 ddev->mode_config.helper_private = &mode_config_helper_funcs; 289 290 kms->dev = ddev; 291 ret = kms->funcs->hw_init(kms); 292 if (ret) { 293 DRM_DEV_ERROR(dev, "kms hw init failed: %d\n", ret); 294 goto err_msm_uninit; 295 } 296 297 drm_helper_move_panel_connectors_to_head(ddev); 298 299 drm_for_each_crtc(crtc, ddev) { 300 struct msm_drm_thread *ev_thread; 301 302 /* initialize event thread */ 303 ev_thread = &kms->event_thread[drm_crtc_index(crtc)]; 304 ev_thread->dev = ddev; 305 ev_thread->worker = kthread_run_worker(0, "crtc_event:%d", crtc->base.id); 306 if (IS_ERR(ev_thread->worker)) { 307 ret = PTR_ERR(ev_thread->worker); 308 DRM_DEV_ERROR(dev, "failed to create crtc_event kthread\n"); 309 ev_thread->worker = NULL; 310 goto err_msm_uninit; 311 } 312 313 sched_set_fifo(ev_thread->worker->task); 314 } 315 316 ret = drm_vblank_init(ddev, ddev->mode_config.num_crtc); 317 if (ret < 0) { 318 DRM_DEV_ERROR(dev, "failed to initialize vblank\n"); 319 goto err_msm_uninit; 320 } 321 322 pm_runtime_get_sync(dev); 323 ret = msm_irq_install(ddev, kms->irq); 324 pm_runtime_put_sync(dev); 325 if (ret < 0) { 326 DRM_DEV_ERROR(dev, "failed to install IRQ handler\n"); 327 goto err_msm_uninit; 328 } 329 330 ret = msm_disp_snapshot_init(ddev); 331 if (ret) 332 DRM_DEV_ERROR(dev, "msm_disp_snapshot_init failed ret = %d\n", ret); 333 334 drm_mode_config_reset(ddev); 335 336 return 0; 337 338 err_msm_uninit: 339 return ret; 340 } 341 342 int msm_kms_pm_prepare(struct device *dev) 343 { 344 struct msm_drm_private *priv = dev_get_drvdata(dev); 345 struct drm_device *ddev = priv ? priv->dev : NULL; 346 347 if (!priv || !priv->kms) 348 return 0; 349 350 return drm_mode_config_helper_suspend(ddev); 351 } 352 353 void msm_kms_pm_complete(struct device *dev) 354 { 355 struct msm_drm_private *priv = dev_get_drvdata(dev); 356 struct drm_device *ddev = priv ? priv->dev : NULL; 357 358 if (!priv || !priv->kms) 359 return; 360 361 drm_mode_config_helper_resume(ddev); 362 } 363 364 void msm_kms_shutdown(struct platform_device *pdev) 365 { 366 struct msm_drm_private *priv = platform_get_drvdata(pdev); 367 struct drm_device *drm = priv ? priv->dev : NULL; 368 369 /* 370 * Shutdown the hw if we're far enough along where things might be on. 371 * If we run this too early, we'll end up panicking in any variety of 372 * places. Since we don't register the drm device until late in 373 * msm_drm_init, drm_dev->registered is used as an indicator that the 374 * shutdown will be successful. 375 */ 376 if (drm && drm->registered && priv->kms) 377 drm_atomic_helper_shutdown(drm); 378 } 379 380 void msm_drm_kms_post_init(struct device *dev) 381 { 382 struct platform_device *pdev = to_platform_device(dev); 383 struct msm_drm_private *priv = platform_get_drvdata(pdev); 384 struct drm_device *ddev = priv->dev; 385 386 drm_kms_helper_poll_init(ddev); 387 drm_client_setup(ddev, NULL); 388 } 389