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