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;
  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         /*
 130          * Always use address space 0 for now.
 131          * FIXME: this needs to be updated when we start using different
 132          * address space.
 133          */
 134         cfg = GPU_PERFCNT_CFG_AS(0) |
 135               GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_MANUAL);
 136
 137         /*
 138          * Bifrost GPUs have 2 set of counters, but we're only interested by
 139          * the first one for now.
 140          */
 141         if (panfrost_model_is_bifrost(pfdev))
 142                 cfg |= GPU_PERFCNT_CFG_SETSEL(counterset);
 143
 144         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0xffffffff);
 145         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0xffffffff);
 146         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0xffffffff);
 147
 148         /*
 149          * Due to PRLAM-8186 we need to disable the Tiler before we enable HW
 150          * counters.
 151          */
 152         if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
 153                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 154         else
 155                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);
 156
 157         gpu_write(pfdev, GPU_PERFCNT_CFG, cfg);
 158
 159         if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
 160                 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);
 161
 162         /* The BO ref is retained by the mapping. */
 163         drm_gem_object_put_unlocked(&bo->base);
 164
 165         return 0;
 166
 167 err_vunmap:
 168         drm_gem_shmem_vunmap(&bo->base, perfcnt->buf);
 169 err_put_mapping:
 170         panfrost_gem_mapping_put(perfcnt->mapping);
 171 err_close_bo:
 172         panfrost_gem_close(&bo->base, file_priv);
 173 err_put_bo:
 174         drm_gem_object_put_unlocked(&bo->base);
 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_gem_mapping_put(perfcnt->mapping);
 199         perfcnt->mapping = NULL;
 200         pm_runtime_mark_last_busy(pfdev->dev);
 201         pm_runtime_put_autosuspend(pfdev->dev);
 202
 203         return 0;
 204 }
 205
 206 int panfrost_ioctl_perfcnt_enable(struct drm_device *dev, void *data,
 207                                   struct drm_file *file_priv)
 208 {
 209         struct panfrost_device *pfdev = dev->dev_private;
 210         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 211         struct drm_panfrost_perfcnt_enable *req = data;
 212         int ret;
 213
 214         ret = panfrost_unstable_ioctl_check();
 215         if (ret)
 216                 return ret;
 217
 218         /* Only Bifrost GPUs have 2 set of counters. */
 219         if (req->counterset > (panfrost_model_is_bifrost(pfdev) ? 1 : 0))
 220                 return -EINVAL;
 221
 222         mutex_lock(&perfcnt->lock);
 223         if (req->enable)
 224                 ret = panfrost_perfcnt_enable_locked(pfdev, file_priv,
 225                                                      req->counterset);
 226         else
 227                 ret = panfrost_perfcnt_disable_locked(pfdev, file_priv);
 228         mutex_unlock(&perfcnt->lock);
 229
 230         return ret;
 231 }
 232
 233 int panfrost_ioctl_perfcnt_dump(struct drm_device *dev, void *data,
 234                                 struct drm_file *file_priv)
 235 {
 236         struct panfrost_device *pfdev = dev->dev_private;
 237         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 238         struct drm_panfrost_perfcnt_dump *req = data;
 239         void __user *user_ptr = (void __user *)(uintptr_t)req->buf_ptr;
 240         int ret;
 241
 242         ret = panfrost_unstable_ioctl_check();
 243         if (ret)
 244                 return ret;
 245
 246         mutex_lock(&perfcnt->lock);
 247         if (perfcnt->user != file_priv->driver_priv) {
 248                 ret = -EINVAL;
 249                 goto out;
 250         }
 251
 252         ret = panfrost_perfcnt_dump_locked(pfdev);
 253         if (ret)
 254                 goto out;
 255
 256         if (copy_to_user(user_ptr, perfcnt->buf, perfcnt->bosize))
 257                 ret = -EFAULT;
 258
 259 out:
 260         mutex_unlock(&perfcnt->lock);
 261
 262         return ret;
 263 }
 264
 265 void panfrost_perfcnt_close(struct drm_file *file_priv)
 266 {
 267         struct panfrost_file_priv *pfile = file_priv->driver_priv;
 268         struct panfrost_device *pfdev = pfile->pfdev;
 269         struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
 270
 271         pm_runtime_get_sync(pfdev->dev);
 272         mutex_lock(&perfcnt->lock);
 273         if (perfcnt->user == pfile)
 274                 panfrost_perfcnt_disable_locked(pfdev, file_priv);
 275         mutex_unlock(&perfcnt->lock);
 276         pm_runtime_mark_last_busy(pfdev->dev);
 277         pm_runtime_put_autosuspend(pfdev->dev);
 278 }
 279
 280 int panfrost_perfcnt_init(struct panfrost_device *pfdev)
 281 {
 282         struct panfrost_perfcnt *perfcnt;
 283         size_t size;
 284
 285         if (panfrost_has_hw_feature(pfdev, HW_FEATURE_V4)) {
 286                 unsigned int ncoregroups;
 287
 288                 ncoregroups = hweight64(pfdev->features.l2_present);
 289                 size = ncoregroups * BLOCKS_PER_COREGROUP *
 290                        COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
 291         } else {
 292                 unsigned int nl2c, ncores;
 293
 294                 /*
 295                  * TODO: define a macro to extract the number of l2 caches from
 296                  * mem_features.
 297                  */
 298                 nl2c = ((pfdev->features.mem_features >> 8) & GENMASK(3, 0)) + 1;
 299
 300                 /*
 301                  * shader_present might be sparse, but the counters layout
 302                  * forces to dump unused regions too, hence the fls64() call
 303                  * instead of hweight64().
 304                  */
 305                 ncores = fls64(pfdev->features.shader_present);
 306
 307                 /*
 308                  * There's always one JM and one Tiler block, hence the '+ 2'
 309                  * here.
 310                  */
 311                 size = (nl2c + ncores + 2) *
 312                        COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
 313         }
 314
 315         perfcnt = devm_kzalloc(pfdev->dev, sizeof(*perfcnt), GFP_KERNEL);
 316         if (!perfcnt)
 317                 return -ENOMEM;
 318
 319         perfcnt->bosize = size;
 320
 321         /* Start with everything disabled. */
 322         gpu_write(pfdev, GPU_PERFCNT_CFG,
 323                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 324         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
 325         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
 326         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
 327         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 328
 329         init_completion(&perfcnt->dump_comp);
 330         mutex_init(&perfcnt->lock);
 331         pfdev->perfcnt = perfcnt;
 332
 333         return 0;
 334 }
 335
 336 void panfrost_perfcnt_fini(struct panfrost_device *pfdev)
 337 {
 338         /* Disable everything before leaving. */
 339         gpu_write(pfdev, GPU_PERFCNT_CFG,
 340                   GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
 341         gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
 342         gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
 343         gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
 344         gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
 345 }