drivers/gpu/drm/v3d/v3d_drv.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (C) 2014-2018 Broadcom */
   3
   4 /**
   5  * DOC: Broadcom V3D Graphics Driver
   6  *
   7  * This driver supports the Broadcom V3D 3.3 and 4.1 OpenGL ES GPUs.
   8  * For V3D 2.x support, see the VC4 driver.
   9  *
  10  * Currently only single-core rendering using the binner and renderer,
  11  * along with TFU (texture formatting unit) rendering is supported.
  12  * V3D 4.x's CSD (compute shader dispatch) is not yet supported.
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/device.h>
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_runtime.h>
  22 #include <drm/drm_fb_cma_helper.h>
  23 #include <drm/drm_fb_helper.h>
  24
  25 #include "uapi/drm/v3d_drm.h"
  26 #include "v3d_drv.h"
  27 #include "v3d_regs.h"
  28
  29 #define DRIVER_NAME "v3d"
  30 #define DRIVER_DESC "Broadcom V3D graphics"
  31 #define DRIVER_DATE "20180419"
  32 #define DRIVER_MAJOR 1
  33 #define DRIVER_MINOR 0
  34 #define DRIVER_PATCHLEVEL 0
  35
  36 #ifdef CONFIG_PM
  37 static int v3d_runtime_suspend(struct device *dev)
  38 {
  39         struct drm_device *drm = dev_get_drvdata(dev);
  40         struct v3d_dev *v3d = to_v3d_dev(drm);
  41
  42         v3d_irq_disable(v3d);
  43
  44         clk_disable_unprepare(v3d->clk);
  45
  46         return 0;
  47 }
  48
  49 static int v3d_runtime_resume(struct device *dev)
  50 {
  51         struct drm_device *drm = dev_get_drvdata(dev);
  52         struct v3d_dev *v3d = to_v3d_dev(drm);
  53         int ret;
  54
  55         ret = clk_prepare_enable(v3d->clk);
  56         if (ret != 0)
  57                 return ret;
  58
  59         /* XXX: VPM base */
  60
  61         v3d_mmu_set_page_table(v3d);
  62         v3d_irq_enable(v3d);
  63
  64         return 0;
  65 }
  66 #endif
  67
  68 static const struct dev_pm_ops v3d_v3d_pm_ops = {
  69         SET_RUNTIME_PM_OPS(v3d_runtime_suspend, v3d_runtime_resume, NULL)
  70 };
  71
  72 static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
  73                                struct drm_file *file_priv)
  74 {
  75         struct v3d_dev *v3d = to_v3d_dev(dev);
  76         struct drm_v3d_get_param *args = data;
  77         int ret;
  78         static const u32 reg_map[] = {
  79                 [DRM_V3D_PARAM_V3D_UIFCFG] = V3D_HUB_UIFCFG,
  80                 [DRM_V3D_PARAM_V3D_HUB_IDENT1] = V3D_HUB_IDENT1,
  81                 [DRM_V3D_PARAM_V3D_HUB_IDENT2] = V3D_HUB_IDENT2,
  82                 [DRM_V3D_PARAM_V3D_HUB_IDENT3] = V3D_HUB_IDENT3,
  83                 [DRM_V3D_PARAM_V3D_CORE0_IDENT0] = V3D_CTL_IDENT0,
  84                 [DRM_V3D_PARAM_V3D_CORE0_IDENT1] = V3D_CTL_IDENT1,
  85                 [DRM_V3D_PARAM_V3D_CORE0_IDENT2] = V3D_CTL_IDENT2,
  86         };
  87
  88         if (args->pad != 0)
  89                 return -EINVAL;
  90
  91         /* Note that DRM_V3D_PARAM_V3D_CORE0_IDENT0 is 0, so we need
  92          * to explicitly allow it in the "the register in our
  93          * parameter map" check.
  94          */
  95         if (args->param < ARRAY_SIZE(reg_map) &&
  96             (reg_map[args->param] ||
  97              args->param == DRM_V3D_PARAM_V3D_CORE0_IDENT0)) {
  98                 u32 offset = reg_map[args->param];
  99
 100                 if (args->value != 0)
 101                         return -EINVAL;
 102
 103                 ret = pm_runtime_get_sync(v3d->dev);
 104                 if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 &&
 105                     args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) {
 106                         args->value = V3D_CORE_READ(0, offset);
 107                 } else {
 108                         args->value = V3D_READ(offset);
 109                 }
 110                 pm_runtime_mark_last_busy(v3d->dev);
 111                 pm_runtime_put_autosuspend(v3d->dev);
 112                 return 0;
 113         }
 114
 115
 116         switch (args->param) {
 117         case DRM_V3D_PARAM_SUPPORTS_TFU:
 118                 args->value = 1;
 119                 return 0;
 120         default:
 121                 DRM_DEBUG("Unknown parameter %d\n", args->param);
 122                 return -EINVAL;
 123         }
 124 }
 125
 126 static int
 127 v3d_open(struct drm_device *dev, struct drm_file *file)
 128 {
 129         struct v3d_dev *v3d = to_v3d_dev(dev);
 130         struct v3d_file_priv *v3d_priv;
 131         struct drm_sched_rq *rq;
 132         int i;
 133
 134         v3d_priv = kzalloc(sizeof(*v3d_priv), GFP_KERNEL);
 135         if (!v3d_priv)
 136                 return -ENOMEM;
 137
 138         v3d_priv->v3d = v3d;
 139
 140         for (i = 0; i < V3D_MAX_QUEUES; i++) {
 141                 rq = &v3d->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
 142                 drm_sched_entity_init(&v3d_priv->sched_entity[i], &rq, 1, NULL);
 143         }
 144
 145         file->driver_priv = v3d_priv;
 146
 147         return 0;
 148 }
 149
 150 static void
 151 v3d_postclose(struct drm_device *dev, struct drm_file *file)
 152 {
 153         struct v3d_file_priv *v3d_priv = file->driver_priv;
 154         enum v3d_queue q;
 155
 156         for (q = 0; q < V3D_MAX_QUEUES; q++) {
 157                 drm_sched_entity_destroy(&v3d_priv->sched_entity[q]);
 158         }
 159
 160         kfree(v3d_priv);
 161 }
 162
 163 static const struct file_operations v3d_drm_fops = {
 164         .owner = THIS_MODULE,
 165         .open = drm_open,
 166         .release = drm_release,
 167         .unlocked_ioctl = drm_ioctl,
 168         .mmap = v3d_mmap,
 169         .poll = drm_poll,
 170         .read = drm_read,
 171         .compat_ioctl = drm_compat_ioctl,
 172         .llseek = noop_llseek,
 173 };
 174
 175 /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have GMP
 176  * protection between clients.  Note that render nodes would be be
 177  * able to submit CLs that could access BOs from clients authenticated
 178  * with the master node.  The TFU doesn't use the GMP, so it would
 179  * need to stay DRM_AUTH until we do buffer size/offset validation.
 180  */
 181 static const struct drm_ioctl_desc v3d_drm_ioctls[] = {
 182         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CL, v3d_submit_cl_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 183         DRM_IOCTL_DEF_DRV(V3D_WAIT_BO, v3d_wait_bo_ioctl, DRM_RENDER_ALLOW),
 184         DRM_IOCTL_DEF_DRV(V3D_CREATE_BO, v3d_create_bo_ioctl, DRM_RENDER_ALLOW),
 185         DRM_IOCTL_DEF_DRV(V3D_MMAP_BO, v3d_mmap_bo_ioctl, DRM_RENDER_ALLOW),
 186         DRM_IOCTL_DEF_DRV(V3D_GET_PARAM, v3d_get_param_ioctl, DRM_RENDER_ALLOW),
 187         DRM_IOCTL_DEF_DRV(V3D_GET_BO_OFFSET, v3d_get_bo_offset_ioctl, DRM_RENDER_ALLOW),
 188         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_TFU, v3d_submit_tfu_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 189 };
 190
 191 static const struct vm_operations_struct v3d_vm_ops = {
 192         .fault = v3d_gem_fault,
 193         .open = drm_gem_vm_open,
 194         .close = drm_gem_vm_close,
 195 };
 196
 197 static struct drm_driver v3d_drm_driver = {
 198         .driver_features = (DRIVER_GEM |
 199                             DRIVER_RENDER |
 200                             DRIVER_PRIME |
 201                             DRIVER_SYNCOBJ),
 202
 203         .open = v3d_open,
 204         .postclose = v3d_postclose,
 205
 206 #if defined(CONFIG_DEBUG_FS)
 207         .debugfs_init = v3d_debugfs_init,
 208 #endif
 209
 210         .gem_free_object_unlocked = v3d_free_object,
 211         .gem_vm_ops = &v3d_vm_ops,
 212
 213         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 214         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 215         .gem_prime_import = drm_gem_prime_import,
 216         .gem_prime_export = drm_gem_prime_export,
 217         .gem_prime_get_sg_table = v3d_prime_get_sg_table,
 218         .gem_prime_import_sg_table = v3d_prime_import_sg_table,
 219         .gem_prime_mmap = v3d_prime_mmap,
 220
 221         .ioctls = v3d_drm_ioctls,
 222         .num_ioctls = ARRAY_SIZE(v3d_drm_ioctls),
 223         .fops = &v3d_drm_fops,
 224
 225         .name = DRIVER_NAME,
 226         .desc = DRIVER_DESC,
 227         .date = DRIVER_DATE,
 228         .major = DRIVER_MAJOR,
 229         .minor = DRIVER_MINOR,
 230         .patchlevel = DRIVER_PATCHLEVEL,
 231 };
 232
 233 static const struct of_device_id v3d_of_match[] = {
 234         { .compatible = "brcm,7268-v3d" },
 235         { .compatible = "brcm,7278-v3d" },
 236         {},
 237 };
 238 MODULE_DEVICE_TABLE(of, v3d_of_match);
 239
 240 static int
 241 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 242 {
 243         struct resource *res =
 244                 platform_get_resource_byname(v3d->pdev, IORESOURCE_MEM, name);
 245
 246         *regs = devm_ioremap_resource(v3d->dev, res);
 247         return PTR_ERR_OR_ZERO(*regs);
 248 }
 249
 250 static int v3d_platform_drm_probe(struct platform_device *pdev)
 251 {
 252         struct device *dev = &pdev->dev;
 253         struct drm_device *drm;
 254         struct v3d_dev *v3d;
 255         int ret;
 256         u32 ident1;
 257
 258         dev->coherent_dma_mask = DMA_BIT_MASK(36);
 259
 260         v3d = kzalloc(sizeof(*v3d), GFP_KERNEL);
 261         if (!v3d)
 262                 return -ENOMEM;
 263         v3d->dev = dev;
 264         v3d->pdev = pdev;
 265         drm = &v3d->drm;
 266
 267         ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
 268         if (ret)
 269                 goto dev_free;
 270
 271         ret = map_regs(v3d, &v3d->hub_regs, "hub");
 272         if (ret)
 273                 goto dev_free;
 274
 275         ret = map_regs(v3d, &v3d->core_regs[0], "core0");
 276         if (ret)
 277                 goto dev_free;
 278
 279         ident1 = V3D_READ(V3D_HUB_IDENT1);
 280         v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 +
 281                     V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_REV));
 282         v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
 283         WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
 284
 285         if (v3d->ver < 41) {
 286                 ret = map_regs(v3d, &v3d->gca_regs, "gca");
 287                 if (ret)
 288                         goto dev_free;
 289         }
 290
 291         v3d->mmu_scratch = dma_alloc_wc(dev, 4096, &v3d->mmu_scratch_paddr,
 292                                         GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
 293         if (!v3d->mmu_scratch) {
 294                 dev_err(dev, "Failed to allocate MMU scratch page\n");
 295                 ret = -ENOMEM;
 296                 goto dev_free;
 297         }
 298
 299         pm_runtime_use_autosuspend(dev);
 300         pm_runtime_set_autosuspend_delay(dev, 50);
 301         pm_runtime_enable(dev);
 302
 303         ret = drm_dev_init(&v3d->drm, &v3d_drm_driver, dev);
 304         if (ret)
 305                 goto dma_free;
 306
 307         platform_set_drvdata(pdev, drm);
 308         drm->dev_private = v3d;
 309
 310         ret = v3d_gem_init(drm);
 311         if (ret)
 312                 goto dev_destroy;
 313
 314         v3d_irq_init(v3d);
 315
 316         ret = drm_dev_register(drm, 0);
 317         if (ret)
 318                 goto gem_destroy;
 319
 320         return 0;
 321
 322 gem_destroy:
 323         v3d_gem_destroy(drm);
 324 dev_destroy:
 325         drm_dev_put(drm);
 326 dma_free:
 327         dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 328 dev_free:
 329         kfree(v3d);
 330         return ret;
 331 }
 332
 333 static int v3d_platform_drm_remove(struct platform_device *pdev)
 334 {
 335         struct drm_device *drm = platform_get_drvdata(pdev);
 336         struct v3d_dev *v3d = to_v3d_dev(drm);
 337
 338         drm_dev_unregister(drm);
 339
 340         v3d_gem_destroy(drm);
 341
 342         drm_dev_put(drm);
 343
 344         dma_free_wc(v3d->dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 345
 346         return 0;
 347 }
 348
 349 static struct platform_driver v3d_platform_driver = {
 350         .probe          = v3d_platform_drm_probe,
 351         .remove         = v3d_platform_drm_remove,
 352         .driver         = {
 353                 .name   = "v3d",
 354                 .of_match_table = v3d_of_match,
 355         },
 356 };
 357
 358 static int __init v3d_drm_register(void)
 359 {
 360         return platform_driver_register(&v3d_platform_driver);
 361 }
 362
 363 static void __exit v3d_drm_unregister(void)
 364 {
 365         platform_driver_unregister(&v3d_platform_driver);
 366 }
 367
 368 module_init(v3d_drm_register);
 369 module_exit(v3d_drm_unregister);
 370
 371 MODULE_ALIAS("platform:v3d-drm");
 372 MODULE_DESCRIPTION("Broadcom V3D DRM Driver");
 373 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 374 MODULE_LICENSE("GPL v2");