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  * The V3D GPU includes a tiled render (composed of a bin and render
  11  * pipelines), the TFU (texture formatting unit), and the CSD (compute
  12  * shader dispatch).
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/io.h>
  19 #include <linux/module.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/reset.h>
  24
  25 #include <drm/drm_drv.h>
  26 #include <drm/drm_fb_cma_helper.h>
  27 #include <drm/drm_fb_helper.h>
  28 #include <drm/drm_managed.h>
  29 #include <uapi/drm/v3d_drm.h>
  30
  31 #include "v3d_drv.h"
  32 #include "v3d_regs.h"
  33
  34 #define DRIVER_NAME "v3d"
  35 #define DRIVER_DESC "Broadcom V3D graphics"
  36 #define DRIVER_DATE "20180419"
  37 #define DRIVER_MAJOR 1
  38 #define DRIVER_MINOR 0
  39 #define DRIVER_PATCHLEVEL 0
  40
  41 static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
  42                                struct drm_file *file_priv)
  43 {
  44         struct v3d_dev *v3d = to_v3d_dev(dev);
  45         struct drm_v3d_get_param *args = data;
  46         int ret;
  47         static const u32 reg_map[] = {
  48                 [DRM_V3D_PARAM_V3D_UIFCFG] = V3D_HUB_UIFCFG,
  49                 [DRM_V3D_PARAM_V3D_HUB_IDENT1] = V3D_HUB_IDENT1,
  50                 [DRM_V3D_PARAM_V3D_HUB_IDENT2] = V3D_HUB_IDENT2,
  51                 [DRM_V3D_PARAM_V3D_HUB_IDENT3] = V3D_HUB_IDENT3,
  52                 [DRM_V3D_PARAM_V3D_CORE0_IDENT0] = V3D_CTL_IDENT0,
  53                 [DRM_V3D_PARAM_V3D_CORE0_IDENT1] = V3D_CTL_IDENT1,
  54                 [DRM_V3D_PARAM_V3D_CORE0_IDENT2] = V3D_CTL_IDENT2,
  55         };
  56
  57         if (args->pad != 0)
  58                 return -EINVAL;
  59
  60         /* Note that DRM_V3D_PARAM_V3D_CORE0_IDENT0 is 0, so we need
  61          * to explicitly allow it in the "the register in our
  62          * parameter map" check.
  63          */
  64         if (args->param < ARRAY_SIZE(reg_map) &&
  65             (reg_map[args->param] ||
  66              args->param == DRM_V3D_PARAM_V3D_CORE0_IDENT0)) {
  67                 u32 offset = reg_map[args->param];
  68
  69                 if (args->value != 0)
  70                         return -EINVAL;
  71
  72                 ret = pm_runtime_get_sync(v3d->drm.dev);
  73                 if (ret < 0)
  74                         return ret;
  75                 if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 &&
  76                     args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) {
  77                         args->value = V3D_CORE_READ(0, offset);
  78                 } else {
  79                         args->value = V3D_READ(offset);
  80                 }
  81                 pm_runtime_mark_last_busy(v3d->drm.dev);
  82                 pm_runtime_put_autosuspend(v3d->drm.dev);
  83                 return 0;
  84         }
  85
  86         switch (args->param) {
  87         case DRM_V3D_PARAM_SUPPORTS_TFU:
  88                 args->value = 1;
  89                 return 0;
  90         case DRM_V3D_PARAM_SUPPORTS_CSD:
  91                 args->value = v3d_has_csd(v3d);
  92                 return 0;
  93         case DRM_V3D_PARAM_SUPPORTS_CACHE_FLUSH:
  94                 args->value = 1;
  95                 return 0;
  96         case DRM_V3D_PARAM_SUPPORTS_PERFMON:
  97                 args->value = (v3d->ver >= 40);
  98                 return 0;
  99         case DRM_V3D_PARAM_SUPPORTS_MULTISYNC_EXT:
 100                 args->value = 1;
 101                 return 0;
 102         default:
 103                 DRM_DEBUG("Unknown parameter %d\n", args->param);
 104                 return -EINVAL;
 105         }
 106 }
 107
 108 static int
 109 v3d_open(struct drm_device *dev, struct drm_file *file)
 110 {
 111         struct v3d_dev *v3d = to_v3d_dev(dev);
 112         struct v3d_file_priv *v3d_priv;
 113         struct drm_gpu_scheduler *sched;
 114         int i;
 115
 116         v3d_priv = kzalloc(sizeof(*v3d_priv), GFP_KERNEL);
 117         if (!v3d_priv)
 118                 return -ENOMEM;
 119
 120         v3d_priv->v3d = v3d;
 121
 122         for (i = 0; i < V3D_MAX_QUEUES; i++) {
 123                 sched = &v3d->queue[i].sched;
 124                 drm_sched_entity_init(&v3d_priv->sched_entity[i],
 125                                       DRM_SCHED_PRIORITY_NORMAL, &sched,
 126                                       1, NULL);
 127         }
 128
 129         v3d_perfmon_open_file(v3d_priv);
 130         file->driver_priv = v3d_priv;
 131
 132         return 0;
 133 }
 134
 135 static void
 136 v3d_postclose(struct drm_device *dev, struct drm_file *file)
 137 {
 138         struct v3d_file_priv *v3d_priv = file->driver_priv;
 139         enum v3d_queue q;
 140
 141         for (q = 0; q < V3D_MAX_QUEUES; q++)
 142                 drm_sched_entity_destroy(&v3d_priv->sched_entity[q]);
 143
 144         v3d_perfmon_close_file(v3d_priv);
 145         kfree(v3d_priv);
 146 }
 147
 148 DEFINE_DRM_GEM_FOPS(v3d_drm_fops);
 149
 150 /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have GMP
 151  * protection between clients.  Note that render nodes would be
 152  * able to submit CLs that could access BOs from clients authenticated
 153  * with the master node.  The TFU doesn't use the GMP, so it would
 154  * need to stay DRM_AUTH until we do buffer size/offset validation.
 155  */
 156 static const struct drm_ioctl_desc v3d_drm_ioctls[] = {
 157         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CL, v3d_submit_cl_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 158         DRM_IOCTL_DEF_DRV(V3D_WAIT_BO, v3d_wait_bo_ioctl, DRM_RENDER_ALLOW),
 159         DRM_IOCTL_DEF_DRV(V3D_CREATE_BO, v3d_create_bo_ioctl, DRM_RENDER_ALLOW),
 160         DRM_IOCTL_DEF_DRV(V3D_MMAP_BO, v3d_mmap_bo_ioctl, DRM_RENDER_ALLOW),
 161         DRM_IOCTL_DEF_DRV(V3D_GET_PARAM, v3d_get_param_ioctl, DRM_RENDER_ALLOW),
 162         DRM_IOCTL_DEF_DRV(V3D_GET_BO_OFFSET, v3d_get_bo_offset_ioctl, DRM_RENDER_ALLOW),
 163         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_TFU, v3d_submit_tfu_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 164         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CSD, v3d_submit_csd_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 165         DRM_IOCTL_DEF_DRV(V3D_PERFMON_CREATE, v3d_perfmon_create_ioctl, DRM_RENDER_ALLOW),
 166         DRM_IOCTL_DEF_DRV(V3D_PERFMON_DESTROY, v3d_perfmon_destroy_ioctl, DRM_RENDER_ALLOW),
 167         DRM_IOCTL_DEF_DRV(V3D_PERFMON_GET_VALUES, v3d_perfmon_get_values_ioctl, DRM_RENDER_ALLOW),
 168 };
 169
 170 static const struct drm_driver v3d_drm_driver = {
 171         .driver_features = (DRIVER_GEM |
 172                             DRIVER_RENDER |
 173                             DRIVER_SYNCOBJ),
 174
 175         .open = v3d_open,
 176         .postclose = v3d_postclose,
 177
 178 #if defined(CONFIG_DEBUG_FS)
 179         .debugfs_init = v3d_debugfs_init,
 180 #endif
 181
 182         .gem_create_object = v3d_create_object,
 183         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 184         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 185         .gem_prime_import_sg_table = v3d_prime_import_sg_table,
 186         .gem_prime_mmap = drm_gem_prime_mmap,
 187
 188         .ioctls = v3d_drm_ioctls,
 189         .num_ioctls = ARRAY_SIZE(v3d_drm_ioctls),
 190         .fops = &v3d_drm_fops,
 191
 192         .name = DRIVER_NAME,
 193         .desc = DRIVER_DESC,
 194         .date = DRIVER_DATE,
 195         .major = DRIVER_MAJOR,
 196         .minor = DRIVER_MINOR,
 197         .patchlevel = DRIVER_PATCHLEVEL,
 198 };
 199
 200 static const struct of_device_id v3d_of_match[] = {
 201         { .compatible = "brcm,7268-v3d" },
 202         { .compatible = "brcm,7278-v3d" },
 203         {},
 204 };
 205 MODULE_DEVICE_TABLE(of, v3d_of_match);
 206
 207 static int
 208 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 209 {
 210         *regs = devm_platform_ioremap_resource_byname(v3d_to_pdev(v3d), name);
 211         return PTR_ERR_OR_ZERO(*regs);
 212 }
 213
 214 static int v3d_platform_drm_probe(struct platform_device *pdev)
 215 {
 216         struct device *dev = &pdev->dev;
 217         struct drm_device *drm;
 218         struct v3d_dev *v3d;
 219         int ret;
 220         u32 mmu_debug;
 221         u32 ident1;
 222
 223         v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev, drm);
 224         if (IS_ERR(v3d))
 225                 return PTR_ERR(v3d);
 226
 227         drm = &v3d->drm;
 228
 229         platform_set_drvdata(pdev, drm);
 230
 231         ret = map_regs(v3d, &v3d->hub_regs, "hub");
 232         if (ret)
 233                 return ret;
 234
 235         ret = map_regs(v3d, &v3d->core_regs[0], "core0");
 236         if (ret)
 237                 return ret;
 238
 239         mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO);
 240         dma_set_mask_and_coherent(dev,
 241                 DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH)));
 242         v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH);
 243
 244         ident1 = V3D_READ(V3D_HUB_IDENT1);
 245         v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 +
 246                     V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_REV));
 247         v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
 248         WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
 249
 250         v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
 251         if (IS_ERR(v3d->reset)) {
 252                 ret = PTR_ERR(v3d->reset);
 253
 254                 if (ret == -EPROBE_DEFER)
 255                         return ret;
 256
 257                 v3d->reset = NULL;
 258                 ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
 259                 if (ret) {
 260                         dev_err(dev,
 261                                 "Failed to get reset control or bridge regs\n");
 262                         return ret;
 263                 }
 264         }
 265
 266         if (v3d->ver < 41) {
 267                 ret = map_regs(v3d, &v3d->gca_regs, "gca");
 268                 if (ret)
 269                         return ret;
 270         }
 271
 272         v3d->mmu_scratch = dma_alloc_wc(dev, 4096, &v3d->mmu_scratch_paddr,
 273                                         GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
 274         if (!v3d->mmu_scratch) {
 275                 dev_err(dev, "Failed to allocate MMU scratch page\n");
 276                 return -ENOMEM;
 277         }
 278
 279         pm_runtime_use_autosuspend(dev);
 280         pm_runtime_set_autosuspend_delay(dev, 50);
 281         pm_runtime_enable(dev);
 282
 283         ret = v3d_gem_init(drm);
 284         if (ret)
 285                 goto dma_free;
 286
 287         ret = v3d_irq_init(v3d);
 288         if (ret)
 289                 goto gem_destroy;
 290
 291         ret = drm_dev_register(drm, 0);
 292         if (ret)
 293                 goto irq_disable;
 294
 295         return 0;
 296
 297 irq_disable:
 298         v3d_irq_disable(v3d);
 299 gem_destroy:
 300         v3d_gem_destroy(drm);
 301 dma_free:
 302         dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 303         return ret;
 304 }
 305
 306 static int v3d_platform_drm_remove(struct platform_device *pdev)
 307 {
 308         struct drm_device *drm = platform_get_drvdata(pdev);
 309         struct v3d_dev *v3d = to_v3d_dev(drm);
 310
 311         drm_dev_unregister(drm);
 312
 313         v3d_gem_destroy(drm);
 314
 315         dma_free_wc(v3d->drm.dev, 4096, v3d->mmu_scratch,
 316                     v3d->mmu_scratch_paddr);
 317
 318         return 0;
 319 }
 320
 321 static struct platform_driver v3d_platform_driver = {
 322         .probe          = v3d_platform_drm_probe,
 323         .remove         = v3d_platform_drm_remove,
 324         .driver         = {
 325                 .name   = "v3d",
 326                 .of_match_table = v3d_of_match,
 327         },
 328 };
 329
 330 module_platform_driver(v3d_platform_driver);
 331
 332 MODULE_ALIAS("platform:v3d-drm");
 333 MODULE_DESCRIPTION("Broadcom V3D DRM Driver");
 334 MODULE_AUTHOR("Eric Anholt <[email protected]>");
 335 MODULE_LICENSE("GPL v2");