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                 goto err_put_pm;
  87
  88         bo = drm_gem_shmem_create(pfdev->ddev, perfcnt->bosize);
  89         if (IS_ERR(bo)) {
  90                 ret = PTR_ERR(bo);
  91                 goto err_put_pm;
  92         }
  93
  94         /* Map the perfcnt buf in the address space attached to file_priv. */
  95         ret = panfrost_gem_open(&bo->base, file_priv);
  96         if (ret)
  97                 goto err_put_bo;
  98
  99         perfcnt->mapping = panfrost_gem_mapping_get(to_panfrost_bo(&bo->base),
 100                                                     user);
 101         if (!perfcnt->mapping) {
 102                 ret = -EINVAL;
 103                 goto err_close_bo;
 104         }
 105
 106         perfcnt->buf = drm_gem_shmem_vmap(&bo->base);
 107         if (IS_ERR(perfcnt->buf)) {
 108                 ret = PTR_ERR(perfcnt->buf);
 109                 goto err_put_mapping;
 110         }
 111
 112         /*
 113          * Invalidate the cache and clear the counters to start from a fresh
 114          * state.
 115          */
 116         reinit_completion(&pfdev->perfcnt->dump_comp);
 117         gpu_write(pfdev, GPU_INT_CLEAR,
 118                   GPU_IRQ_CLEAN_CACHES_COMPLETED |
 119                   GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);
 120         gpu_write(pfdev, GPU_CMD, GPU_CMD_PERFCNT_CLEAR);
 121         gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_INV_CACHES);
 122         ret = wait_for_completion_timeout(&pfdev->perfcnt->dump_comp,
 123                                           msecs_to_jiffies(1000));
 124         if (!ret) {
 125                 ret = -ETIMEDOUT;
 126                 goto err_vunmap;
 127         }
 128
 129         perfcnt->user = user;
 130
 131         as = panfrost_mmu_as_get(pfdev, perfcnt->mapping->mmu);
 132         cfg = GPU_PERFCNT_CFG_AS(as) |
 133               GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_MANUAL);
 134
 135         /*
 136          * Bifrost GPUs have 2 set of counters, but we're only interested by
 137          * the first one for now.
 138          */
 139         if (panfrost_model_is_bifrost(pfdev))
 140                 cfg |= GPU_PERFCNT_CFG_SETSEL(counterset);
 141
 142         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0xffffffff);
 143         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0xffffffff);
 144         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0xffffffff);
 145
 146         /*
 147          * Due to PRLAM-8186 we need to disable the Tiler before we enable HW
 148          * counters.
 149          */
 150         if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
 151                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 152         else
 153                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);
 154
 155         gpu_write(pfdev, GPU_PERFCNT_CFG, cfg);
 156
 157         if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
 158                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);
 159
 160         /* The BO ref is retained by the mapping. */
 161         drm_gem_object_put(&bo->base);
 162
 163         return 0;
 164
 165 err_vunmap:
 166         drm_gem_shmem_vunmap(&bo->base, perfcnt->buf);
 167 err_put_mapping:
 168         panfrost_gem_mapping_put(perfcnt->mapping);
 169 err_close_bo:
 170         panfrost_gem_close(&bo->base, file_priv);
 171 err_put_bo:
 172         drm_gem_object_put(&bo->base);
 173 err_put_pm:
 174         pm_runtime_put(pfdev->dev);
 175         return ret;
 176 }
 177
 178 static int panfrost_perfcnt_disable_locked(struct panfrost_device *pfdev,
 179                                            struct drm_file *file_priv)
 180 {
 181         struct panfrost_file_priv *user = file_priv->driver_priv;
 182         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 183
 184         if (user != perfcnt->user)
 185                 return -EINVAL;
 186
 187         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0x0);
 188         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0x0);
 189         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0x0);
 190         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 191         gpu_write(pfdev, GPU_PERFCNT_CFG,
 192                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 193
 194         perfcnt->user = NULL;
 195         drm_gem_shmem_vunmap(&perfcnt->mapping->obj->base.base, perfcnt->buf);
 196         perfcnt->buf = NULL;
 197         panfrost_gem_close(&perfcnt->mapping->obj->base.base, file_priv);
 198         panfrost_mmu_as_put(pfdev, perfcnt->mapping->mmu);
 199         panfrost_gem_mapping_put(perfcnt->mapping);
 200         perfcnt->mapping = NULL;
 201         pm_runtime_mark_last_busy(pfdev->dev);
 202         pm_runtime_put_autosuspend(pfdev->dev);
 203
 204         return 0;
 205 }
 206
 207 int panfrost_ioctl_perfcnt_enable(struct drm_device *dev, void *data,
 208                                   struct drm_file *file_priv)
 209 {
 210         struct panfrost_device *pfdev = dev->dev_private;
 211         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 212         struct drm_panfrost_perfcnt_enable *req = data;
 213         int ret;
 214
 215         ret = panfrost_unstable_ioctl_check();
 216         if (ret)
 217                 return ret;
 218
 219         /* Only Bifrost GPUs have 2 set of counters. */
 220         if (req->counterset > (panfrost_model_is_bifrost(pfdev) ? 1 : 0))
 221                 return -EINVAL;
 222
 223         mutex_lock(&perfcnt->lock);
 224         if (req->enable)
 225                 ret = panfrost_perfcnt_enable_locked(pfdev, file_priv,
 226                                                      req->counterset);
 227         else
 228                 ret = panfrost_perfcnt_disable_locked(pfdev, file_priv);
 229         mutex_unlock(&perfcnt->lock);
 230
 231         return ret;
 232 }
 233
 234 int panfrost_ioctl_perfcnt_dump(struct drm_device *dev, void *data,
 235                                 struct drm_file *file_priv)
 236 {
 237         struct panfrost_device *pfdev = dev->dev_private;
 238         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 239         struct drm_panfrost_perfcnt_dump *req = data;
 240         void __user *user_ptr = (void __user *)(uintptr_t)req->buf_ptr;
 241         int ret;
 242
 243         ret = panfrost_unstable_ioctl_check();
 244         if (ret)
 245                 return ret;
 246
 247         mutex_lock(&perfcnt->lock);
 248         if (perfcnt->user != file_priv->driver_priv) {
 249                 ret = -EINVAL;
 250                 goto out;
 251         }
 252
 253         ret = panfrost_perfcnt_dump_locked(pfdev);
 254         if (ret)
 255                 goto out;
 256
 257         if (copy_to_user(user_ptr, perfcnt->buf, perfcnt->bosize))
 258                 ret = -EFAULT;
 259
 260 out:
 261         mutex_unlock(&perfcnt->lock);
 262
 263         return ret;
 264 }
 265
 266 void panfrost_perfcnt_close(struct drm_file *file_priv)
 267 {
 268         struct panfrost_file_priv *pfile = file_priv->driver_priv;
 269         struct panfrost_device *pfdev = pfile->pfdev;
 270         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 271
 272         pm_runtime_get_sync(pfdev->dev);
 273         mutex_lock(&perfcnt->lock);
 274         if (perfcnt->user == pfile)
 275                 panfrost_perfcnt_disable_locked(pfdev, file_priv);
 276         mutex_unlock(&perfcnt->lock);
 277         pm_runtime_mark_last_busy(pfdev->dev);
 278         pm_runtime_put_autosuspend(pfdev->dev);
 279 }
 280
 281 int panfrost_perfcnt_init(struct panfrost_device *pfdev)
 282 {
 283         struct panfrost_perfcnt *perfcnt;
 284         size_t size;
 285
 286         if (panfrost_has_hw_feature(pfdev, HW_FEATURE_V4)) {
 287                 unsigned int ncoregroups;
 288
 289                 ncoregroups = hweight64(pfdev->features.l2_present);
 290                 size = ncoregroups * BLOCKS_PER_COREGROUP *
 291                        COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
 292         } else {
 293                 unsigned int nl2c, ncores;
 294
 295                 /*
 296                  * TODO: define a macro to extract the number of l2 caches from
 297                  * mem_features.
 298                  */
 299                 nl2c = ((pfdev->features.mem_features >> 8) & GENMASK(3, 0)) + 1;
 300
 301                 /*
 302                  * shader_present might be sparse, but the counters layout
 303                  * forces to dump unused regions too, hence the fls64() call
 304                  * instead of hweight64().
 305                  */
 306                 ncores = fls64(pfdev->features.shader_present);
 307
 308                 /*
 309                  * There's always one JM and one Tiler block, hence the '+ 2'
 310                  * here.
 311                  */
 312                 size = (nl2c + ncores + 2) *
 313                        COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
 314         }
 315
 316         perfcnt = devm_kzalloc(pfdev->dev, sizeof(*perfcnt), GFP_KERNEL);
 317         if (!perfcnt)
 318                 return -ENOMEM;
 319
 320         perfcnt->bosize = size;
 321
 322         /* Start with everything disabled. */
 323         gpu_write(pfdev, GPU_PERFCNT_CFG,
 324                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 325         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
 326         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
 327         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
 328         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 329
 330         init_completion(&perfcnt->dump_comp);
 331         mutex_init(&perfcnt->lock);
 332         pfdev->perfcnt = perfcnt;
 333
 334         return 0;
 335 }
 336
 337 void panfrost_perfcnt_fini(struct panfrost_device *pfdev)
 338 {
 339         /* Disable everything before leaving. */
 340         gpu_write(pfdev, GPU_PERFCNT_CFG,
 341                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 342         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
 343         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
 344         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
 345         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 346 }