drivers/gpu/drm/panfrost/panfrost_perfcnt.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright 2019 Collabora Ltd */
   3
   4 #include <drm/drm_file.h>
   5 #include <drm/drm_gem_shmem_helper.h>
   6 #include <drm/panfrost_drm.h>
   7 #include <linux/completion.h>
   8 #include <linux/iopoll.h>
   9 #include <linux/pm_runtime.h>
  10 #include <linux/slab.h>
  11 #include <linux/uaccess.h>
  12
  13 #include "panfrost_device.h"
  14 #include "panfrost_features.h"
  15 #include "panfrost_gem.h"
  16 #include "panfrost_issues.h"
  17 #include "panfrost_job.h"
  18 #include "panfrost_mmu.h"
  19 #include "panfrost_perfcnt.h"
  20 #include "panfrost_regs.h"
  21
  22 #define COUNTERS_PER_BLOCK              64
  23 #define BYTES_PER_COUNTER               4
  24 #define BLOCKS_PER_COREGROUP            8
  25 #define V4_SHADERS_PER_COREGROUP        4
  26
  27 struct panfrost_perfcnt {
  28         struct panfrost_gem_mapping *mapping;
  29         size_t bosize;
  30         void *buf;
  31         struct panfrost_file_priv *user;
  32         struct mutex lock;
  33         struct completion dump_comp;
  34 };
  35
  36 void panfrost_perfcnt_clean_cache_done(struct panfrost_device *pfdev)
  37 {
  38         complete(&pfdev->perfcnt->dump_comp);
  39 }
  40
  41 void panfrost_perfcnt_sample_done(struct panfrost_device *pfdev)
  42 {
  43         gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_CACHES);
  44 }
  45
  46 static int panfrost_perfcnt_dump_locked(struct panfrost_device *pfdev)
  47 {
  48         u64 gpuva;
  49         int ret;
  50
  51         reinit_completion(&pfdev->perfcnt->dump_comp);
  52         gpuva = pfdev->perfcnt->mapping->mmnode.start << PAGE_SHIFT;
  53         gpu_write(pfdev, GPU_PERFCNT_BASE_LO, gpuva);
  54         gpu_write(pfdev, GPU_PERFCNT_BASE_HI, gpuva >> 32);
  55         gpu_write(pfdev, GPU_INT_CLEAR,
  56                   GPU_IRQ_CLEAN_CACHES_COMPLETED |
  57                   GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);
  58         gpu_write(pfdev, GPU_CMD, GPU_CMD_PERFCNT_SAMPLE);
  59         ret = wait_for_completion_interruptible_timeout(&pfdev->perfcnt->dump_comp,
  60                                                         msecs_to_jiffies(1000));
  61         if (!ret)
  62                 ret = -ETIMEDOUT;
  63         else if (ret > 0)
  64                 ret = 0;
  65
  66         return ret;
  67 }
  68
  69 static int panfrost_perfcnt_enable_locked(struct panfrost_device *pfdev,
  70                                           struct drm_file *file_priv,
  71                                           unsigned int counterset)
  72 {
  73         struct panfrost_file_priv *user = file_priv->driver_priv;
  74         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
  75         struct drm_gem_shmem_object *bo;
  76         u32 cfg, as;
  77         int ret;
  78
  79         if (user == perfcnt->user)
  80                 return 0;
  81         else if (perfcnt->user)
  82                 return -EBUSY;
  83
  84         ret = pm_runtime_get_sync(pfdev->dev);
  85         if (ret < 0)
  86                 return ret;
  87
  88         bo = drm_gem_shmem_create(pfdev->ddev, perfcnt->bosize);
  89         if (IS_ERR(bo))
  90                 return PTR_ERR(bo);
  91
  92         /* Map the perfcnt buf in the address space attached to file_priv. */
  93         ret = panfrost_gem_open(&bo->base, file_priv);
  94         if (ret)
  95                 goto err_put_bo;
  96
  97         perfcnt->mapping = panfrost_gem_mapping_get(to_panfrost_bo(&bo->base),
  98                                                     user);
  99         if (!perfcnt->mapping) {
 100                 ret = -EINVAL;
 101                 goto err_close_bo;
 102         }
 103
 104         perfcnt->buf = drm_gem_shmem_vmap(&bo->base);
 105         if (IS_ERR(perfcnt->buf)) {
 106                 ret = PTR_ERR(perfcnt->buf);
 107                 goto err_put_mapping;
 108         }
 109
 110         /*
 111          * Invalidate the cache and clear the counters to start from a fresh
 112          * state.
 113          */
 114         reinit_completion(&pfdev->perfcnt->dump_comp);
 115         gpu_write(pfdev, GPU_INT_CLEAR,
 116                   GPU_IRQ_CLEAN_CACHES_COMPLETED |
 117                   GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);
 118         gpu_write(pfdev, GPU_CMD, GPU_CMD_PERFCNT_CLEAR);
 119         gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_INV_CACHES);
 120         ret = wait_for_completion_timeout(&pfdev->perfcnt->dump_comp,
 121                                           msecs_to_jiffies(1000));
 122         if (!ret) {
 123                 ret = -ETIMEDOUT;
 124                 goto err_vunmap;
 125         }
 126
 127         perfcnt->user = user;
 128
 129         as = panfrost_mmu_as_get(pfdev, perfcnt->mapping->mmu);
 130         cfg = GPU_PERFCNT_CFG_AS(as) |
 131               GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_MANUAL);
 132
 133         /*
 134          * Bifrost GPUs have 2 set of counters, but we're only interested by
 135          * the first one for now.
 136          */
 137         if (panfrost_model_is_bifrost(pfdev))
 138                 cfg |= GPU_PERFCNT_CFG_SETSEL(counterset);
 139
 140         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0xffffffff);
 141         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0xffffffff);
 142         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0xffffffff);
 143
 144         /*
 145          * Due to PRLAM-8186 we need to disable the Tiler before we enable HW
 146          * counters.
 147          */
 148         if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
 149                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 150         else
 151                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);
 152
 153         gpu_write(pfdev, GPU_PERFCNT_CFG, cfg);
 154
 155         if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
 156                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);
 157
 158         /* The BO ref is retained by the mapping. */
 159         drm_gem_object_put_unlocked(&bo->base);
 160
 161         return 0;
 162
 163 err_vunmap:
 164         drm_gem_shmem_vunmap(&bo->base, perfcnt->buf);
 165 err_put_mapping:
 166         panfrost_gem_mapping_put(perfcnt->mapping);
 167 err_close_bo:
 168         panfrost_gem_close(&bo->base, file_priv);
 169 err_put_bo:
 170         drm_gem_object_put_unlocked(&bo->base);
 171         return ret;
 172 }
 173
 174 static int panfrost_perfcnt_disable_locked(struct panfrost_device *pfdev,
 175                                            struct drm_file *file_priv)
 176 {
 177         struct panfrost_file_priv *user = file_priv->driver_priv;
 178         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 179
 180         if (user != perfcnt->user)
 181                 return -EINVAL;
 182
 183         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0x0);
 184         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0x0);
 185         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0x0);
 186         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 187         gpu_write(pfdev, GPU_PERFCNT_CFG,
 188                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 189
 190         perfcnt->user = NULL;
 191         drm_gem_shmem_vunmap(&perfcnt->mapping->obj->base.base, perfcnt->buf);
 192         perfcnt->buf = NULL;
 193         panfrost_gem_close(&perfcnt->mapping->obj->base.base, file_priv);
 194         panfrost_mmu_as_put(pfdev, perfcnt->mapping->mmu);
 195         panfrost_gem_mapping_put(perfcnt->mapping);
 196         perfcnt->mapping = NULL;
 197         pm_runtime_mark_last_busy(pfdev->dev);
 198         pm_runtime_put_autosuspend(pfdev->dev);
 199
 200         return 0;
 201 }
 202
 203 int panfrost_ioctl_perfcnt_enable(struct drm_device *dev, void *data,
 204                                   struct drm_file *file_priv)
 205 {
 206         struct panfrost_device *pfdev = dev->dev_private;
 207         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 208         struct drm_panfrost_perfcnt_enable *req = data;
 209         int ret;
 210
 211         ret = panfrost_unstable_ioctl_check();
 212         if (ret)
 213                 return ret;
 214
 215         /* Only Bifrost GPUs have 2 set of counters. */
 216         if (req->counterset > (panfrost_model_is_bifrost(pfdev) ? 1 : 0))
 217                 return -EINVAL;
 218
 219         mutex_lock(&perfcnt->lock);
 220         if (req->enable)
 221                 ret = panfrost_perfcnt_enable_locked(pfdev, file_priv,
 222                                                      req->counterset);
 223         else
 224                 ret = panfrost_perfcnt_disable_locked(pfdev, file_priv);
 225         mutex_unlock(&perfcnt->lock);
 226
 227         return ret;
 228 }
 229
 230 int panfrost_ioctl_perfcnt_dump(struct drm_device *dev, void *data,
 231                                 struct drm_file *file_priv)
 232 {
 233         struct panfrost_device *pfdev = dev->dev_private;
 234         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 235         struct drm_panfrost_perfcnt_dump *req = data;
 236         void __user *user_ptr = (void __user *)(uintptr_t)req->buf_ptr;
 237         int ret;
 238
 239         ret = panfrost_unstable_ioctl_check();
 240         if (ret)
 241                 return ret;
 242
 243         mutex_lock(&perfcnt->lock);
 244         if (perfcnt->user != file_priv->driver_priv) {
 245                 ret = -EINVAL;
 246                 goto out;
 247         }
 248
 249         ret = panfrost_perfcnt_dump_locked(pfdev);
 250         if (ret)
 251                 goto out;
 252
 253         if (copy_to_user(user_ptr, perfcnt->buf, perfcnt->bosize))
 254                 ret = -EFAULT;
 255
 256 out:
 257         mutex_unlock(&perfcnt->lock);
 258
 259         return ret;
 260 }
 261
 262 void panfrost_perfcnt_close(struct drm_file *file_priv)
 263 {
 264         struct panfrost_file_priv *pfile = file_priv->driver_priv;
 265         struct panfrost_device *pfdev = pfile->pfdev;
 266         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 267
 268         pm_runtime_get_sync(pfdev->dev);
 269         mutex_lock(&perfcnt->lock);
 270         if (perfcnt->user == pfile)
 271                 panfrost_perfcnt_disable_locked(pfdev, file_priv);
 272         mutex_unlock(&perfcnt->lock);
 273         pm_runtime_mark_last_busy(pfdev->dev);
 274         pm_runtime_put_autosuspend(pfdev->dev);
 275 }
 276
 277 int panfrost_perfcnt_init(struct panfrost_device *pfdev)
 278 {
 279         struct panfrost_perfcnt *perfcnt;
 280         size_t size;
 281
 282         if (panfrost_has_hw_feature(pfdev, HW_FEATURE_V4)) {
 283                 unsigned int ncoregroups;
 284
 285                 ncoregroups = hweight64(pfdev->features.l2_present);
 286                 size = ncoregroups * BLOCKS_PER_COREGROUP *
 287                        COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
 288         } else {
 289                 unsigned int nl2c, ncores;
 290
 291                 /*
 292                  * TODO: define a macro to extract the number of l2 caches from
 293                  * mem_features.
 294                  */
 295                 nl2c = ((pfdev->features.mem_features >> 8) & GENMASK(3, 0)) + 1;
 296
 297                 /*
 298                  * shader_present might be sparse, but the counters layout
 299                  * forces to dump unused regions too, hence the fls64() call
 300                  * instead of hweight64().
 301                  */
 302                 ncores = fls64(pfdev->features.shader_present);
 303
 304                 /*
 305                  * There's always one JM and one Tiler block, hence the '+ 2'
 306                  * here.
 307                  */
 308                 size = (nl2c + ncores + 2) *
 309                        COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
 310         }
 311
 312         perfcnt = devm_kzalloc(pfdev->dev, sizeof(*perfcnt), GFP_KERNEL);
 313         if (!perfcnt)
 314                 return -ENOMEM;
 315
 316         perfcnt->bosize = size;
 317
 318         /* Start with everything disabled. */
 319         gpu_write(pfdev, GPU_PERFCNT_CFG,
 320                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 321         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
 322         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
 323         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
 324         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 325
 326         init_completion(&perfcnt->dump_comp);
 327         mutex_init(&perfcnt->lock);
 328         pfdev->perfcnt = perfcnt;
 329
 330         return 0;
 331 }
 332
 333 void panfrost_perfcnt_fini(struct panfrost_device *pfdev)
 334 {
 335         /* Disable everything before leaving. */
 336         gpu_write(pfdev, GPU_PERFCNT_CFG,
 337                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 338         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
 339         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
 340         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
 341         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 342 }