summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
blob: ec4695cf3caf315b56c02c37e334457719f262f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Collabora Ltd */

#include <drm/drm_file.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/panfrost_drm.h>
#include <linux/completion.h>
#include <linux/iopoll.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include "panfrost_device.h"
#include "panfrost_features.h"
#include "panfrost_gem.h"
#include "panfrost_issues.h"
#include "panfrost_job.h"
#include "panfrost_mmu.h"
#include "panfrost_perfcnt.h"
#include "panfrost_regs.h"

#define COUNTERS_PER_BLOCK		64
#define BYTES_PER_COUNTER		4
#define BLOCKS_PER_COREGROUP		8
#define V4_SHADERS_PER_COREGROUP	4

struct panfrost_perfcnt {
	struct panfrost_gem_mapping *mapping;
	size_t bosize;
	void *buf;
	struct panfrost_file_priv *user;
	struct mutex lock;
	struct completion dump_comp;
};

void panfrost_perfcnt_clean_cache_done(struct panfrost_device *pfdev)
{
	complete(&pfdev->perfcnt->dump_comp);
}

void panfrost_perfcnt_sample_done(struct panfrost_device *pfdev)
{
	gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_CACHES);
}

static int panfrost_perfcnt_dump_locked(struct panfrost_device *pfdev)
{
	u64 gpuva;
	int ret;

	reinit_completion(&pfdev->perfcnt->dump_comp);
	gpuva = pfdev->perfcnt->mapping->mmnode.start << PAGE_SHIFT;
	gpu_write(pfdev, GPU_PERFCNT_BASE_LO, gpuva);
	gpu_write(pfdev, GPU_PERFCNT_BASE_HI, gpuva >> 32);
	gpu_write(pfdev, GPU_INT_CLEAR,
		  GPU_IRQ_CLEAN_CACHES_COMPLETED |
		  GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);
	gpu_write(pfdev, GPU_CMD, GPU_CMD_PERFCNT_SAMPLE);
	ret = wait_for_completion_interruptible_timeout(&pfdev->perfcnt->dump_comp,
							msecs_to_jiffies(1000));
	if (!ret)
		ret = -ETIMEDOUT;
	else if (ret > 0)
		ret = 0;

	return ret;
}

static int panfrost_perfcnt_enable_locked(struct panfrost_device *pfdev,
					  struct drm_file *file_priv,
					  unsigned int counterset)
{
	struct panfrost_file_priv *user = file_priv->driver_priv;
	struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
	struct drm_gem_shmem_object *bo;
	u32 cfg, as;
	int ret;

	if (user == perfcnt->user)
		return 0;
	else if (perfcnt->user)
		return -EBUSY;

	ret = pm_runtime_get_sync(pfdev->dev);
	if (ret < 0)
		return ret;

	bo = drm_gem_shmem_create(pfdev->ddev, perfcnt->bosize);
	if (IS_ERR(bo))
		return PTR_ERR(bo);

	/* Map the perfcnt buf in the address space attached to file_priv. */
	ret = panfrost_gem_open(&bo->base, file_priv);
	if (ret)
		goto err_put_bo;

	perfcnt->mapping = panfrost_gem_mapping_get(to_panfrost_bo(&bo->base),
						    user);
	if (!perfcnt->mapping) {
		ret = -EINVAL;
		goto err_close_bo;
	}

	perfcnt->buf = drm_gem_shmem_vmap(&bo->base);
	if (IS_ERR(perfcnt->buf)) {
		ret = PTR_ERR(perfcnt->buf);
		goto err_put_mapping;
	}

	/*
	 * Invalidate the cache and clear the counters to start from a fresh
	 * state.
	 */
	reinit_completion(&pfdev->perfcnt->dump_comp);
	gpu_write(pfdev, GPU_INT_CLEAR,
		  GPU_IRQ_CLEAN_CACHES_COMPLETED |
		  GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);
	gpu_write(pfdev, GPU_CMD, GPU_CMD_PERFCNT_CLEAR);
	gpu_write(pfdev, GPU_CMD, GPU_CMD_CLEAN_INV_CACHES);
	ret = wait_for_completion_timeout(&pfdev->perfcnt->dump_comp,
					  msecs_to_jiffies(1000));
	if (!ret) {
		ret = -ETIMEDOUT;
		goto err_vunmap;
	}

	perfcnt->user = user;

	as = panfrost_mmu_as_get(pfdev, perfcnt->mapping->mmu);
	cfg = GPU_PERFCNT_CFG_AS(as) |
	      GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_MANUAL);

	/*
	 * Bifrost GPUs have 2 set of counters, but we're only interested by
	 * the first one for now.
	 */
	if (panfrost_model_is_bifrost(pfdev))
		cfg |= GPU_PERFCNT_CFG_SETSEL(counterset);

	gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0xffffffff);
	gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0xffffffff);
	gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0xffffffff);

	/*
	 * Due to PRLAM-8186 we need to disable the Tiler before we enable HW
	 * counters.
	 */
	if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
		gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
	else
		gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);

	gpu_write(pfdev, GPU_PERFCNT_CFG, cfg);

	if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
		gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);

	/* The BO ref is retained by the mapping. */
	drm_gem_object_put(&bo->base);

	return 0;

err_vunmap:
	drm_gem_shmem_vunmap(&bo->base, perfcnt->buf);
err_put_mapping:
	panfrost_gem_mapping_put(perfcnt->mapping);
err_close_bo:
	panfrost_gem_close(&bo->base, file_priv);
err_put_bo:
	drm_gem_object_put(&bo->base);
	return ret;
}

static int panfrost_perfcnt_disable_locked(struct panfrost_device *pfdev,
					   struct drm_file *file_priv)
{
	struct panfrost_file_priv *user = file_priv->driver_priv;
	struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;

	if (user != perfcnt->user)
		return -EINVAL;

	gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0x0);
	gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0x0);
	gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0x0);
	gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
	gpu_write(pfdev, GPU_PERFCNT_CFG,
		  GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));

	perfcnt->user = NULL;
	drm_gem_shmem_vunmap(&perfcnt->mapping->obj->base.base, perfcnt->buf);
	perfcnt->buf = NULL;
	panfrost_gem_close(&perfcnt->mapping->obj->base.base, file_priv);
	panfrost_mmu_as_put(pfdev, perfcnt->mapping->mmu);
	panfrost_gem_mapping_put(perfcnt->mapping);
	perfcnt->mapping = NULL;
	pm_runtime_mark_last_busy(pfdev->dev);
	pm_runtime_put_autosuspend(pfdev->dev);

	return 0;
}

int panfrost_ioctl_perfcnt_enable(struct drm_device *dev, void *data,
				  struct drm_file *file_priv)
{
	struct panfrost_device *pfdev = dev->dev_private;
	struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
	struct drm_panfrost_perfcnt_enable *req = data;
	int ret;

	ret = panfrost_unstable_ioctl_check();
	if (ret)
		return ret;

	/* Only Bifrost GPUs have 2 set of counters. */
	if (req->counterset > (panfrost_model_is_bifrost(pfdev) ? 1 : 0))
		return -EINVAL;

	mutex_lock(&perfcnt->lock);
	if (req->enable)
		ret = panfrost_perfcnt_enable_locked(pfdev, file_priv,
						     req->counterset);
	else
		ret = panfrost_perfcnt_disable_locked(pfdev, file_priv);
	mutex_unlock(&perfcnt->lock);

	return ret;
}

int panfrost_ioctl_perfcnt_dump(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	struct panfrost_device *pfdev = dev->dev_private;
	struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;
	struct drm_panfrost_perfcnt_dump *req = data;
	void __user *user_ptr = (void __user *)(uintptr_t)req->buf_ptr;
	int ret;

	ret = panfrost_unstable_ioctl_check();
	if (ret)
		return ret;

	mutex_lock(&perfcnt->lock);
	if (perfcnt->user != file_priv->driver_priv) {
		ret = -EINVAL;
		goto out;
	}

	ret = panfrost_perfcnt_dump_locked(pfdev);
	if (ret)
		goto out;

	if (copy_to_user(user_ptr, perfcnt->buf, perfcnt->bosize))
		ret = -EFAULT;

out:
	mutex_unlock(&perfcnt->lock);

	return ret;
}

void panfrost_perfcnt_close(struct drm_file *file_priv)
{
	struct panfrost_file_priv *pfile = file_priv->driver_priv;
	struct panfrost_device *pfdev = pfile->pfdev;
	struct panfrost_perfcnt *perfcnt = pfdev->perfcnt;

	pm_runtime_get_sync(pfdev->dev);
	mutex_lock(&perfcnt->lock);
	if (perfcnt->user == pfile)
		panfrost_perfcnt_disable_locked(pfdev, file_priv);
	mutex_unlock(&perfcnt->lock);
	pm_runtime_mark_last_busy(pfdev->dev);
	pm_runtime_put_autosuspend(pfdev->dev);
}

int panfrost_perfcnt_init(struct panfrost_device *pfdev)
{
	struct panfrost_perfcnt *perfcnt;
	size_t size;

	if (panfrost_has_hw_feature(pfdev, HW_FEATURE_V4)) {
		unsigned int ncoregroups;

		ncoregroups = hweight64(pfdev->features.l2_present);
		size = ncoregroups * BLOCKS_PER_COREGROUP *
		       COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
	} else {
		unsigned int nl2c, ncores;

		/*
		 * TODO: define a macro to extract the number of l2 caches from
		 * mem_features.
		 */
		nl2c = ((pfdev->features.mem_features >> 8) & GENMASK(3, 0)) + 1;

		/*
		 * shader_present might be sparse, but the counters layout
		 * forces to dump unused regions too, hence the fls64() call
		 * instead of hweight64().
		 */
		ncores = fls64(pfdev->features.shader_present);

		/*
		 * There's always one JM and one Tiler block, hence the '+ 2'
		 * here.
		 */
		size = (nl2c + ncores + 2) *
		       COUNTERS_PER_BLOCK * BYTES_PER_COUNTER;
	}

	perfcnt = devm_kzalloc(pfdev->dev, sizeof(*perfcnt), GFP_KERNEL);
	if (!perfcnt)
		return -ENOMEM;

	perfcnt->bosize = size;

	/* Start with everything disabled. */
	gpu_write(pfdev, GPU_PERFCNT_CFG,
		  GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
	gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
	gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
	gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
	gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);

	init_completion(&perfcnt->dump_comp);
	mutex_init(&perfcnt->lock);
	pfdev->perfcnt = perfcnt;

	return 0;
}

void panfrost_perfcnt_fini(struct panfrost_device *pfdev)
{
	/* Disable everything before leaving. */
	gpu_write(pfdev, GPU_PERFCNT_CFG,
		  GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
	gpu_write(pfdev, GPU_PRFCNT_JM_EN, 0);
	gpu_write(pfdev, GPU_PRFCNT_SHADER_EN, 0);
	gpu_write(pfdev, GPU_PRFCNT_MMU_L2_EN, 0);
	gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0);
}