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
  87         switch (args->param) {
  88         case DRM_V3D_PARAM_SUPPORTS_TFU:
  89                 args->value = 1;
  90                 return 0;
  91         case DRM_V3D_PARAM_SUPPORTS_CSD:
  92                 args->value = v3d_has_csd(v3d);
  93                 return 0;
  94         case DRM_V3D_PARAM_SUPPORTS_CACHE_FLUSH:
  95                 args->value = 1;
  96                 return 0;
  97         case DRM_V3D_PARAM_SUPPORTS_PERFMON:
  98                 args->value = (v3d->ver >= 40);
  99                 return 0;
 100         default:
 101                 DRM_DEBUG("Unknown parameter %d\n", args->param);
 102                 return -EINVAL;
 103         }
 104 }
 105
 106 static int
 107 v3d_open(struct drm_device *dev, struct drm_file *file)
 108 {
 109         struct v3d_dev *v3d = to_v3d_dev(dev);
 110         struct v3d_file_priv *v3d_priv;
 111         struct drm_gpu_scheduler *sched;
 112         int i;
 113
 114         v3d_priv = kzalloc(sizeof(*v3d_priv), GFP_KERNEL);
 115         if (!v3d_priv)
 116                 return -ENOMEM;
 117
 118         v3d_priv->v3d = v3d;
 119
 120         for (i = 0; i < V3D_MAX_QUEUES; i++) {
 121                 sched = &v3d->queue[i].sched;
 122                 drm_sched_entity_init(&v3d_priv->sched_entity[i],
 123                                       DRM_SCHED_PRIORITY_NORMAL, &sched,
 124                                       1, NULL);
 125         }
 126
 127         v3d_perfmon_open_file(v3d_priv);
 128         file->driver_priv = v3d_priv;
 129
 130         return 0;
 131 }
 132
 133 static void
 134 v3d_postclose(struct drm_device *dev, struct drm_file *file)
 135 {
 136         struct v3d_file_priv *v3d_priv = file->driver_priv;
 137         enum v3d_queue q;
 138
 139         for (q = 0; q < V3D_MAX_QUEUES; q++) {
 140                 drm_sched_entity_destroy(&v3d_priv->sched_entity[q]);
 141         }
 142
 143         v3d_perfmon_close_file(v3d_priv);
 144         kfree(v3d_priv);
 145 }
 146
 147 DEFINE_DRM_GEM_FOPS(v3d_drm_fops);
 148
 149 /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have GMP
 150  * protection between clients.  Note that render nodes would be be
 151  * able to submit CLs that could access BOs from clients authenticated
 152  * with the master node.  The TFU doesn't use the GMP, so it would
 153  * need to stay DRM_AUTH until we do buffer size/offset validation.
 154  */
 155 static const struct drm_ioctl_desc v3d_drm_ioctls[] = {
 156         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CL, v3d_submit_cl_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 157         DRM_IOCTL_DEF_DRV(V3D_WAIT_BO, v3d_wait_bo_ioctl, DRM_RENDER_ALLOW),
 158         DRM_IOCTL_DEF_DRV(V3D_CREATE_BO, v3d_create_bo_ioctl, DRM_RENDER_ALLOW),
 159         DRM_IOCTL_DEF_DRV(V3D_MMAP_BO, v3d_mmap_bo_ioctl, DRM_RENDER_ALLOW),
 160         DRM_IOCTL_DEF_DRV(V3D_GET_PARAM, v3d_get_param_ioctl, DRM_RENDER_ALLOW),
 161         DRM_IOCTL_DEF_DRV(V3D_GET_BO_OFFSET, v3d_get_bo_offset_ioctl, DRM_RENDER_ALLOW),
 162         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_TFU, v3d_submit_tfu_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 163         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CSD, v3d_submit_csd_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 164         DRM_IOCTL_DEF_DRV(V3D_PERFMON_CREATE, v3d_perfmon_create_ioctl, DRM_RENDER_ALLOW),
 165         DRM_IOCTL_DEF_DRV(V3D_PERFMON_DESTROY, v3d_perfmon_destroy_ioctl, DRM_RENDER_ALLOW),
 166         DRM_IOCTL_DEF_DRV(V3D_PERFMON_GET_VALUES, v3d_perfmon_get_values_ioctl, DRM_RENDER_ALLOW),
 167 };
 168
 169 static const struct drm_driver v3d_drm_driver = {
 170         .driver_features = (DRIVER_GEM |
 171                             DRIVER_RENDER |
 172                             DRIVER_SYNCOBJ),
 173
 174         .open = v3d_open,
 175         .postclose = v3d_postclose,
 176
 177 #if defined(CONFIG_DEBUG_FS)
 178         .debugfs_init = v3d_debugfs_init,
 179 #endif
 180
 181         .gem_create_object = v3d_create_object,
 182         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 183         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 184         .gem_prime_import_sg_table = v3d_prime_import_sg_table,
 185         .gem_prime_mmap = drm_gem_prime_mmap,
 186
 187         .ioctls = v3d_drm_ioctls,
 188         .num_ioctls = ARRAY_SIZE(v3d_drm_ioctls),
 189         .fops = &v3d_drm_fops,
 190
 191         .name = DRIVER_NAME,
 192         .desc = DRIVER_DESC,
 193         .date = DRIVER_DATE,
 194         .major = DRIVER_MAJOR,
 195         .minor = DRIVER_MINOR,
 196         .patchlevel = DRIVER_PATCHLEVEL,
 197 };
 198
 199 static const struct of_device_id v3d_of_match[] = {
 200         { .compatible = "brcm,7268-v3d" },
 201         { .compatible = "brcm,7278-v3d" },
 202         {},
 203 };
 204 MODULE_DEVICE_TABLE(of, v3d_of_match);
 205
 206 static int
 207 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 208 {
 209         struct resource *res =
 210                 platform_get_resource_byname(v3d_to_pdev(v3d), IORESOURCE_MEM, name);
 211
 212         *regs = devm_ioremap_resource(v3d->drm.dev, res);
 213         return PTR_ERR_OR_ZERO(*regs);
 214 }
 215
 216 static int v3d_platform_drm_probe(struct platform_device *pdev)
 217 {
 218         struct device *dev = &pdev->dev;
 219         struct drm_device *drm;
 220         struct v3d_dev *v3d;
 221         int ret;
 222         u32 mmu_debug;
 223         u32 ident1;
 224
 225
 226         v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev, drm);
 227         if (IS_ERR(v3d))
 228                 return PTR_ERR(v3d);
 229
 230         drm = &v3d->drm;
 231
 232         platform_set_drvdata(pdev, drm);
 233
 234         ret = map_regs(v3d, &v3d->hub_regs, "hub");
 235         if (ret)
 236                 return ret;
 237
 238         ret = map_regs(v3d, &v3d->core_regs[0], "core0");
 239         if (ret)
 240                 return ret;
 241
 242         mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO);
 243         dma_set_mask_and_coherent(dev,
 244                 DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH)));
 245         v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH);
 246
 247         ident1 = V3D_READ(V3D_HUB_IDENT1);
 248         v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 +
 249                     V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_REV));
 250         v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
 251         WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
 252
 253         v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
 254         if (IS_ERR(v3d->reset)) {
 255                 ret = PTR_ERR(v3d->reset);
 256
 257                 if (ret == -EPROBE_DEFER)
 258                         return ret;
 259
 260                 v3d->reset = NULL;
 261                 ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
 262                 if (ret) {
 263                         dev_err(dev,
 264                                 "Failed to get reset control or bridge regs\n");
 265                         return ret;
 266                 }
 267         }
 268
 269         if (v3d->ver < 41) {
 270                 ret = map_regs(v3d, &v3d->gca_regs, "gca");
 271                 if (ret)
 272                         return ret;
 273         }
 274
 275         v3d->mmu_scratch = dma_alloc_wc(dev, 4096, &v3d->mmu_scratch_paddr,
 276                                         GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
 277         if (!v3d->mmu_scratch) {
 278                 dev_err(dev, "Failed to allocate MMU scratch page\n");
 279                 return -ENOMEM;
 280         }
 281
 282         pm_runtime_use_autosuspend(dev);
 283         pm_runtime_set_autosuspend_delay(dev, 50);
 284         pm_runtime_enable(dev);
 285
 286         ret = v3d_gem_init(drm);
 287         if (ret)
 288                 goto dma_free;
 289
 290         ret = v3d_irq_init(v3d);
 291         if (ret)
 292                 goto gem_destroy;
 293
 294         ret = drm_dev_register(drm, 0);
 295         if (ret)
 296                 goto irq_disable;
 297
 298         return 0;
 299
 300 irq_disable:
 301         v3d_irq_disable(v3d);
 302 gem_destroy:
 303         v3d_gem_destroy(drm);
 304 dma_free:
 305         dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 306         return ret;
 307 }
 308
 309 static int v3d_platform_drm_remove(struct platform_device *pdev)
 310 {
 311         struct drm_device *drm = platform_get_drvdata(pdev);
 312         struct v3d_dev *v3d = to_v3d_dev(drm);
 313
 314         drm_dev_unregister(drm);
 315
 316         v3d_gem_destroy(drm);
 317
 318         dma_free_wc(v3d->drm.dev, 4096, v3d->mmu_scratch,
 319                     v3d->mmu_scratch_paddr);
 320
 321         return 0;
 322 }
 323
 324 static struct platform_driver v3d_platform_driver = {
 325         .probe          = v3d_platform_drm_probe,
 326         .remove         = v3d_platform_drm_remove,
 327         .driver         = {
 328                 .name   = "v3d",
 329                 .of_match_table = v3d_of_match,
 330         },
 331 };
 332
 333 module_platform_driver(v3d_platform_driver);
 334
 335 MODULE_ALIAS("platform:v3d-drm");
 336 MODULE_DESCRIPTION("Broadcom V3D DRM Driver");
 337 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 338 MODULE_LICENSE("GPL v2");