1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2019 Collabora Ltd */
3
4 #include <linux/completion.h>
5 #include <linux/iopoll.h>
6 #include <linux/iosys-map.h>
7 #include <linux/pm_runtime.h>
8 #include <linux/slab.h>
9 #include <linux/uaccess.h>
10
11 #include <drm/drm_file.h>
12 #include <drm/drm_gem_shmem_helper.h>
13 #include <drm/panfrost_drm.h>
14
15 #include "panfrost_device.h"
16 #include "panfrost_features.h"
17 #include "panfrost_gem.h"
18 #include "panfrost_issues.h"
19 #include "panfrost_job.h"
20 #include "panfrost_mmu.h"
21 #include "panfrost_perfcnt.h"
22 #include "panfrost_regs.h"
23
24 #define COUNTERS_PER_BLOCK 64
25 #define BYTES_PER_COUNTER 4
26 #define BLOCKS_PER_COREGROUP 8
27 #define V4_SHADERS_PER_COREGROUP 4
28
29 struct panfrost_perfcnt {
30 struct panfrost_gem_mapping *mapping;
31 size_t bosize;
32 void *buf;
33 struct panfrost_file_priv *user;
34 struct mutex lock;
35 struct completion dump_comp;
36 };
37
panfrost_perfcnt_clean_cache_done(struct panfrost_device * pfdev)38 void panfrost_perfcnt_clean_cache_done(struct panfrost_device *pfdev)
39 {
40 complete(&pfdev->perfcnt->dump_comp);
41 }
42
panfrost_perfcnt_sample_done(struct panfrost_device * pfdev)43 void panfrost_perfcnt_sample_done(struct panfrost_device *pfdev)
44 {
45 gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_CACHES);
46 }
47
panfrost_perfcnt_dump_locked(struct panfrost_device * pfdev)48 static int panfrost_perfcnt_dump_locked(struct panfrost_device *pfdev)
49 {
50 u64 gpuva;
51 int ret;
52
53 reinit_completion(&pfdev->perfcnt->dump_comp);
54 gpuva = pfdev->perfcnt->mapping->mmnode.start << PAGE_SHIFT;
55 gpu_write(pfdev, GPU_PERFCNT_BASE_LO, lower_32_bits(gpuva));
56 gpu_write(pfdev, GPU_PERFCNT_BASE_HI, upper_32_bits(gpuva));
57 gpu_write(pfdev, GPU_INT_CLEAR,
58 GPU_IRQ_CLEAN_CACHES_COMPLETED |
59 GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);
60 gpu_write(pfdev, GPU_CMD, GPU_CMD_PERFCNT_SAMPLE);
61 ret = wait_for_completion_interruptible_timeout(&pfdev->perfcnt->dump_comp,
62 msecs_to_jiffies(1000));
63 if (!ret)
64 ret = -ETIMEDOUT;
65 else if (ret > 0)
66 ret = 0;
67
68 return ret;
69 }
70
panfrost_perfcnt_enable_locked(struct panfrost_device * pfdev,struct drm_file * file_priv,unsigned int counterset)71 static int panfrost_perfcnt_enable_locked(struct panfrost_device *pfdev,
72 struct drm_file *file_priv,
73 unsigned int counterset)
74 {
75 struct panfrost_file_priv *user = file_priv->driver_priv;
76 struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
77 struct iosys_map map;
78 struct drm_gem_shmem_object *bo;
79 u32 cfg, as;
80 int ret;
81
82 if (user == perfcnt->user)
83 return 0;
84 else if (perfcnt->user)
85 return -EBUSY;
86
87 ret = pm_runtime_get_sync(pfdev->dev);
88 if (ret < 0)
89 goto err_put_pm;
90
91 bo = drm_gem_shmem_create(pfdev->ddev, perfcnt->bosize);
92 if (IS_ERR(bo)) {
93 ret = PTR_ERR(bo);
94 goto err_put_pm;
95 }
96
97 /* Map the perfcnt buf in the address space attached to file_priv. */
98 ret = panfrost_gem_open(&bo->base, file_priv);
99 if (ret)
100 goto err_put_bo;
101
102 perfcnt->mapping = panfrost_gem_mapping_get(to_panfrost_bo(&bo->base),
103 user);
104 if (!perfcnt->mapping) {
105 ret = -EINVAL;
106 goto err_close_bo;
107 }
108
109 ret = drm_gem_shmem_vmap(bo, &map);
110 if (ret)
111 goto err_put_mapping;
112 perfcnt->buf = map.vaddr;
113
114 /*
115 * Invalidate the cache and clear the counters to start from a fresh
116 * state.
117 */
118 reinit_completion(&pfdev->perfcnt->dump_comp);
119 gpu_write(pfdev, GPU_INT_CLEAR,
120 GPU_IRQ_CLEAN_CACHES_COMPLETED |
121 GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);
122 gpu_write(pfdev, GPU_CMD, GPU_CMD_PERFCNT_CLEAR);
123 gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_INV_CACHES);
124 ret = wait_for_completion_timeout(&pfdev->perfcnt->dump_comp,
125 msecs_to_jiffies(1000));
126 if (!ret) {
127 ret = -ETIMEDOUT;
128 goto err_vunmap;
129 }
130
131 perfcnt->user = user;
132
133 as = panfrost_mmu_as_get(pfdev, perfcnt->mapping->mmu);
134 cfg = GPU_PERFCNT_CFG_AS(as) |
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(&bo->base);
164
165 return 0;
166
167 err_vunmap:
168 drm_gem_shmem_vunmap(bo, &map);
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(&bo->base);
175 err_put_pm:
176 pm_runtime_put(pfdev->dev);
177 return ret;
178 }
179
panfrost_perfcnt_disable_locked(struct panfrost_device * pfdev,struct drm_file * file_priv)180 static int panfrost_perfcnt_disable_locked(struct panfrost_device *pfdev,
181 struct drm_file *file_priv)
182 {
183 struct panfrost_file_priv *user = file_priv->driver_priv;
184 struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
185 struct iosys_map map = IOSYS_MAP_INIT_VADDR(perfcnt->buf);
186
187 if (user != perfcnt->user)
188 return -EINVAL;
189
190 gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0x0);
191 gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0x0);
192 gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0x0);
193 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
194 gpu_write(pfdev, GPU_PERFCNT_CFG,
195 GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
196
197 perfcnt->user = NULL;
198 drm_gem_shmem_vunmap(&perfcnt->mapping->obj->base, &map);
199 perfcnt->buf = NULL;
200 panfrost_gem_close(&perfcnt->mapping->obj->base.base, file_priv);
201 panfrost_mmu_as_put(pfdev, perfcnt->mapping->mmu);
202 panfrost_gem_mapping_put(perfcnt->mapping);
203 perfcnt->mapping = NULL;
204 pm_runtime_mark_last_busy(pfdev->dev);
205 pm_runtime_put_autosuspend(pfdev->dev);
206
207 return 0;
208 }
209
panfrost_ioctl_perfcnt_enable(struct drm_device * dev,void * data,struct drm_file * file_priv)210 int panfrost_ioctl_perfcnt_enable(struct drm_device *dev, void *data,
211 struct drm_file *file_priv)
212 {
213 struct panfrost_device *pfdev = dev->dev_private;
214 struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
215 struct drm_panfrost_perfcnt_enable *req = data;
216 int ret;
217
218 ret = panfrost_unstable_ioctl_check();
219 if (ret)
220 return ret;
221
222 /* Only Bifrost GPUs have 2 set of counters. */
223 if (req->counterset > (panfrost_model_is_bifrost(pfdev) ? 1 : 0))
224 return -EINVAL;
225
226 mutex_lock(&perfcnt->lock);
227 if (req->enable)
228 ret = panfrost_perfcnt_enable_locked(pfdev, file_priv,
229 req->counterset);
230 else
231 ret = panfrost_perfcnt_disable_locked(pfdev, file_priv);
232 mutex_unlock(&perfcnt->lock);
233
234 return ret;
235 }
236
panfrost_ioctl_perfcnt_dump(struct drm_device * dev,void * data,struct drm_file * file_priv)237 int panfrost_ioctl_perfcnt_dump(struct drm_device *dev, void *data,
238 struct drm_file *file_priv)
239 {
240 struct panfrost_device *pfdev = dev->dev_private;
241 struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
242 struct drm_panfrost_perfcnt_dump *req = data;
243 void __user *user_ptr = (void __user *)(uintptr_t)req->buf_ptr;
244 int ret;
245
246 ret = panfrost_unstable_ioctl_check();
247 if (ret)
248 return ret;
249
250 mutex_lock(&perfcnt->lock);
251 if (perfcnt->user != file_priv->driver_priv) {
252 ret = -EINVAL;
253 goto out;
254 }
255
256 ret = panfrost_perfcnt_dump_locked(pfdev);
257 if (ret)
258 goto out;
259
260 if (copy_to_user(user_ptr, perfcnt->buf, perfcnt->bosize))
261 ret = -EFAULT;
262
263 out:
264 mutex_unlock(&perfcnt->lock);
265
266 return ret;
267 }
268
panfrost_perfcnt_close(struct drm_file * file_priv)269 void panfrost_perfcnt_close(struct drm_file *file_priv)
270 {
271 struct panfrost_file_priv *pfile = file_priv->driver_priv;
272 struct panfrost_device *pfdev = pfile->pfdev;
273 struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
274
275 pm_runtime_get_sync(pfdev->dev);
276 mutex_lock(&perfcnt->lock);
277 if (perfcnt->user == pfile)
278 panfrost_perfcnt_disable_locked(pfdev, file_priv);
279 mutex_unlock(&perfcnt->lock);
280 pm_runtime_mark_last_busy(pfdev->dev);
281 pm_runtime_put_autosuspend(pfdev->dev);
282 }
283
panfrost_perfcnt_init(struct panfrost_device * pfdev)284 int panfrost_perfcnt_init(struct panfrost_device *pfdev)
285 {
286 struct panfrost_perfcnt *perfcnt;
287 size_t size;
288
289 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_V4)) {
290 unsigned int ncoregroups;
291
292 ncoregroups = hweight64(pfdev->features.l2_present);
293 size = ncoregroups * BLOCKS_PER_COREGROUP *
294 COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
295 } else {
296 unsigned int nl2c, ncores;
297
298 /*
299 * TODO: define a macro to extract the number of l2 caches from
300 * mem_features.
301 */
302 nl2c = ((pfdev->features.mem_features >> 8) & GENMASK(3, 0)) + 1;
303
304 /*
305 * shader_present might be sparse, but the counters layout
306 * forces to dump unused regions too, hence the fls64() call
307 * instead of hweight64().
308 */
309 ncores = fls64(pfdev->features.shader_present);
310
311 /*
312 * There's always one JM and one Tiler block, hence the '+ 2'
313 * here.
314 */
315 size = (nl2c + ncores + 2) *
316 COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
317 }
318
319 perfcnt = devm_kzalloc(pfdev->dev, sizeof(*perfcnt), GFP_KERNEL);
320 if (!perfcnt)
321 return -ENOMEM;
322
323 perfcnt->bosize = size;
324
325 /* Start with everything disabled. */
326 gpu_write(pfdev, GPU_PERFCNT_CFG,
327 GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
328 gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
329 gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
330 gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
331 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
332
333 init_completion(&perfcnt->dump_comp);
334 mutex_init(&perfcnt->lock);
335 pfdev->perfcnt = perfcnt;
336
337 return 0;
338 }
339
panfrost_perfcnt_fini(struct panfrost_device * pfdev)340 void panfrost_perfcnt_fini(struct panfrost_device *pfdev)
341 {
342 /* Disable everything before leaving. */
343 gpu_write(pfdev, GPU_PERFCNT_CFG,
344 GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
345 gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
346 gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
347 gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
348 gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
349 }
350