[deliverable/linux.git] / drivers / gpu / drm / msm / msm_perf.c

/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/* For profiling, userspace can:
 *
 *   tail -f /sys/kernel/debug/dri/<minor>/gpu
 *
 * This will enable performance counters/profiling to track the busy time
 * and any gpu specific performance counters that are supported.
 */

#ifdef CONFIG_DEBUG_FS

#include <linux/debugfs.h>

#include "msm_drv.h"
#include "msm_gpu.h"

struct msm_perf_state {
	struct drm_device *dev;

	bool open;
	int cnt;
	struct mutex read_lock;

	char buf[256];
	int buftot, bufpos;

	unsigned long next_jiffies;

	struct dentry *ent;
	struct drm_info_node *node;
};

#define SAMPLE_TIME (HZ/4)

/* wait for next sample time: */
static int wait_sample(struct msm_perf_state *perf)
{
	unsigned long start_jiffies = jiffies;

	if (time_after(perf->next_jiffies, start_jiffies)) {
		unsigned long remaining_jiffies =
			perf->next_jiffies - start_jiffies;
		int ret = schedule_timeout_interruptible(remaining_jiffies);
		if (ret > 0) {
			/* interrupted */
			return -ERESTARTSYS;
		}
	}
	perf->next_jiffies += SAMPLE_TIME;
	return 0;
}

static int refill_buf(struct msm_perf_state *perf)
{
	struct msm_drm_private *priv = perf->dev->dev_private;
	struct msm_gpu *gpu = priv->gpu;
	char *ptr = perf->buf;
	int rem = sizeof(perf->buf);
	int i, n;

	if ((perf->cnt++ % 32) == 0) {
		/* Header line: */
		n = snprintf(ptr, rem, "%%BUSY");
		ptr += n;
		rem -= n;

		for (i = 0; i < gpu->num_perfcntrs; i++) {
			const struct msm_gpu_perfcntr *perfcntr = &gpu->perfcntrs[i];
			n = snprintf(ptr, rem, "\t%s", perfcntr->name);
			ptr += n;
			rem -= n;
		}
	} else {
		/* Sample line: */
		uint32_t activetime = 0, totaltime = 0;
		uint32_t cntrs[5];
		uint32_t val;
		int ret;

		/* sleep until next sample time: */
		ret = wait_sample(perf);
		if (ret)
			return ret;

		ret = msm_gpu_perfcntr_sample(gpu, &activetime, &totaltime,
				ARRAY_SIZE(cntrs), cntrs);
		if (ret < 0)
			return ret;

		val = totaltime ? 1000 * activetime / totaltime : 0;
		n = snprintf(ptr, rem, "%3d.%d%%", val / 10, val % 10);
		ptr += n;
		rem -= n;

		for (i = 0; i < ret; i++) {
			/* cycle counters (I think).. convert to MHz.. */
			val = cntrs[i] / 10000;
			n = snprintf(ptr, rem, "\t%5d.%02d",
					val / 100, val % 100);
			ptr += n;
			rem -= n;
		}
	}

	n = snprintf(ptr, rem, "\n");
	ptr += n;
	rem -= n;

	perf->bufpos = 0;
	perf->buftot = ptr - perf->buf;

	return 0;
}

static ssize_t perf_read(struct file *file, char __user *buf,
		size_t sz, loff_t *ppos)
{
	struct msm_perf_state *perf = file->private_data;
	int n = 0, ret = 0;

	mutex_lock(&perf->read_lock);

	if (perf->bufpos >= perf->buftot) {
		ret = refill_buf(perf);
		if (ret)
			goto out;
	}

	n = min((int)sz, perf->buftot - perf->bufpos);
	if (copy_to_user(buf, &perf->buf[perf->bufpos], n)) {
		ret = -EFAULT;
		goto out;
	}

	perf->bufpos += n;
	*ppos += n;

out:
	mutex_unlock(&perf->read_lock);
	if (ret)
		return ret;
	return n;
}

static int perf_open(struct inode *inode, struct file *file)
{
	struct msm_perf_state *perf = inode->i_private;
	struct drm_device *dev = perf->dev;
	struct msm_drm_private *priv = dev->dev_private;
	struct msm_gpu *gpu = priv->gpu;
	int ret = 0;

	mutex_lock(&dev->struct_mutex);

	if (perf->open || !gpu) {
		ret = -EBUSY;
		goto out;
	}

	file->private_data = perf;
	perf->open = true;
	perf->cnt = 0;
	perf->buftot = 0;
	perf->bufpos = 0;
	msm_gpu_perfcntr_start(gpu);
	perf->next_jiffies = jiffies + SAMPLE_TIME;

out:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

static int perf_release(struct inode *inode, struct file *file)
{
	struct msm_perf_state *perf = inode->i_private;
	struct msm_drm_private *priv = perf->dev->dev_private;
	msm_gpu_perfcntr_stop(priv->gpu);
	perf->open = false;
	return 0;
}


static const struct file_operations perf_debugfs_fops = {
	.owner = THIS_MODULE,
	.open = perf_open,
	.read = perf_read,
	.llseek = no_llseek,
	.release = perf_release,
};

int msm_perf_debugfs_init(struct drm_minor *minor)
{
	struct msm_drm_private *priv = minor->dev->dev_private;
	struct msm_perf_state *perf;

	/* only create on first minor: */
	if (priv->perf)
		return 0;

	perf = kzalloc(sizeof(*perf), GFP_KERNEL);
	if (!perf)
		return -ENOMEM;

	perf->dev = minor->dev;

	mutex_init(&perf->read_lock);
	priv->perf = perf;

	perf->node = kzalloc(sizeof(*perf->node), GFP_KERNEL);
	if (!perf->node)
		goto fail;

	perf->ent = debugfs_create_file("perf", S_IFREG | S_IRUGO,
			minor->debugfs_root, perf, &perf_debugfs_fops);
	if (!perf->ent) {
		DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/perf\n",
				minor->debugfs_root->d_name.name);
		goto fail;
	}

	perf->node->minor = minor;
	perf->node->dent  = perf->ent;
	perf->node->info_ent = NULL;

	mutex_lock(&minor->debugfs_lock);
	list_add(&perf->node->list, &minor->debugfs_list);
	mutex_unlock(&minor->debugfs_lock);

	return 0;

fail:
	msm_perf_debugfs_cleanup(minor);
	return -1;
}

void msm_perf_debugfs_cleanup(struct drm_minor *minor)
{
	struct msm_drm_private *priv = minor->dev->dev_private;
	struct msm_perf_state *perf = priv->perf;

	if (!perf)
		return;

	priv->perf = NULL;

	debugfs_remove(perf->ent);

	if (perf->node) {
		mutex_lock(&minor->debugfs_lock);
		list_del(&perf->node->list);
		mutex_unlock(&minor->debugfs_lock);
		kfree(perf->node);
	}

	mutex_destroy(&perf->read_lock);

	kfree(perf);
}

#endif
Commit	Line	Data
70c70f09 RC	1	/*
	2	* Copyright (C) 2013 Red Hat
	3	* Author: Rob Clark <robdclark@gmail.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 as published by
	7	* the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	/* For profiling, userspace can:
	19	*
	20	* tail -f /sys/kernel/debug/dri/<minor>/gpu
	21	*
	22	* This will enable performance counters/profiling to track the busy time
	23	* and any gpu specific performance counters that are supported.
	24	*/
	25
	26	#ifdef CONFIG_DEBUG_FS
	27
	28	#include <linux/debugfs.h>
	29
	30	#include "msm_drv.h"
	31	#include "msm_gpu.h"
	32
	33	struct msm_perf_state {
	34	struct drm_device *dev;
	35
	36	bool open;
	37	int cnt;
	38	struct mutex read_lock;
	39
	40	char buf[256];
	41	int buftot, bufpos;
	42
	43	unsigned long next_jiffies;
	44
	45	struct dentry *ent;
	46	struct drm_info_node *node;
	47	};
	48
	49	#define SAMPLE_TIME (HZ/4)
	50
	51	/* wait for next sample time: */
	52	static int wait_sample(struct msm_perf_state *perf)
	53	{
	54	unsigned long start_jiffies = jiffies;
	55
	56	if (time_after(perf->next_jiffies, start_jiffies)) {
	57	unsigned long remaining_jiffies =
	58	perf->next_jiffies - start_jiffies;
	59	int ret = schedule_timeout_interruptible(remaining_jiffies);
	60	if (ret > 0) {
	61	/* interrupted */
	62	return -ERESTARTSYS;
	63	}
	64	}
65	perf->next_jiffies += SAMPLE_TIME;
66	return 0;
67	}
68
69	static int refill_buf(struct msm_perf_state *perf)
70	{
71	struct msm_drm_private *priv = perf->dev->dev_private;
72	struct msm_gpu *gpu = priv->gpu;
73	char *ptr = perf->buf;
74	int rem = sizeof(perf->buf);
75	int i, n;
76
77	if ((perf->cnt++ % 32) == 0) {
78	/* Header line: */
79	n = snprintf(ptr, rem, "%%BUSY");
80	ptr += n;
81	rem -= n;
82
83	for (i = 0; i < gpu->num_perfcntrs; i++) {
84	const struct msm_gpu_perfcntr *perfcntr = &gpu->perfcntrs[i];
85	n = snprintf(ptr, rem, "\t%s", perfcntr->name);
86	ptr += n;
87	rem -= n;
88	}
89	} else {
90	/* Sample line: */
91	uint32_t activetime = 0, totaltime = 0;
92	uint32_t cntrs[5];
93	uint32_t val;
94	int ret;
95
96	/* sleep until next sample time: */
97	ret = wait_sample(perf);
98	if (ret)
99	return ret;
100
101	ret = msm_gpu_perfcntr_sample(gpu, &activetime, &totaltime,
102	ARRAY_SIZE(cntrs), cntrs);
103	if (ret < 0)
104	return ret;
105
106	val = totaltime ? 1000 * activetime / totaltime : 0;
107	n = snprintf(ptr, rem, "%3d.%d%%", val / 10, val % 10);
108	ptr += n;
109	rem -= n;
110
111	for (i = 0; i < ret; i++) {
112	/* cycle counters (I think).. convert to MHz.. */
113	val = cntrs[i] / 10000;
114	n = snprintf(ptr, rem, "\t%5d.%02d",
115	val / 100, val % 100);
116	ptr += n;
117	rem -= n;
118	}
119	}
120
121	n = snprintf(ptr, rem, "\n");
122	ptr += n;
123	rem -= n;
124
125	perf->bufpos = 0;
126	perf->buftot = ptr - perf->buf;
127
128	return 0;
129	}
130
131	static ssize_t perf_read(struct file file, char __user buf,
132	size_t sz, loff_t *ppos)
133	{
134	struct msm_perf_state *perf = file->private_data;
5745d21f	135	int n = 0, ret = 0;
70c70f09 RC	136
	137	mutex_lock(&perf->read_lock);
	138
	139	if (perf->bufpos >= perf->buftot) {
	140	ret = refill_buf(perf);
	141	if (ret)
	142	goto out;
	143	}
	144
	145	n = min((int)sz, perf->buftot - perf->bufpos);
5745d21f DC	146	if (copy_to_user(buf, &perf->buf[perf->bufpos], n)) {
5745d21f DC	147	ret = -EFAULT;
70c70f09	148	goto out;
5745d21f	149	}
70c70f09 RC	150
	151	perf->bufpos += n;
	152	*ppos += n;
	153
	154	out:
	155	mutex_unlock(&perf->read_lock);
	156	if (ret)
	157	return ret;
	158	return n;
	159	}
	160
	161	static int perf_open(struct inode inode, struct file file)
	162	{
	163	struct msm_perf_state *perf = inode->i_private;
	164	struct drm_device *dev = perf->dev;
	165	struct msm_drm_private *priv = dev->dev_private;
	166	struct msm_gpu *gpu = priv->gpu;
	167	int ret = 0;
	168
	169	mutex_lock(&dev->struct_mutex);
	170
	171	if (perf->open \|\| !gpu) {
	172	ret = -EBUSY;
	173	goto out;
	174	}
	175
	176	file->private_data = perf;
	177	perf->open = true;
	178	perf->cnt = 0;
	179	perf->buftot = 0;
	180	perf->bufpos = 0;
	181	msm_gpu_perfcntr_start(gpu);
	182	perf->next_jiffies = jiffies + SAMPLE_TIME;
	183
	184	out:
	185	mutex_unlock(&dev->struct_mutex);
	186	return ret;
	187	}
	188
	189	static int perf_release(struct inode inode, struct file file)
	190	{
	191	struct msm_perf_state *perf = inode->i_private;
	192	struct msm_drm_private *priv = perf->dev->dev_private;
	193	msm_gpu_perfcntr_stop(priv->gpu);
	194	perf->open = false;
	195	return 0;
	196	}
	197
	198
	199	static const struct file_operations perf_debugfs_fops = {
	200	.owner = THIS_MODULE,
	201	.open = perf_open,
	202	.read = perf_read,
	203	.llseek = no_llseek,
	204	.release = perf_release,
	205	};
	206
	207	int msm_perf_debugfs_init(struct drm_minor *minor)
	208	{
	209	struct msm_drm_private *priv = minor->dev->dev_private;
	210	struct msm_perf_state *perf;
	211
	212	/* only create on first minor: */
	213	if (priv->perf)
214	return 0;
215
216	perf = kzalloc(sizeof(*perf), GFP_KERNEL);
217	if (!perf)
218	return -ENOMEM;
219
220	perf->dev = minor->dev;
221
222	mutex_init(&perf->read_lock);
223	priv->perf = perf;
224
225	perf->node = kzalloc(sizeof(*perf->node), GFP_KERNEL);
226	if (!perf->node)
227	goto fail;
228
229	perf->ent = debugfs_create_file("perf", S_IFREG \| S_IRUGO,
230	minor->debugfs_root, perf, &perf_debugfs_fops);
231	if (!perf->ent) {
232	DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/perf\n",
233	minor->debugfs_root->d_name.name);
234	goto fail;
235	}
236
237	perf->node->minor = minor;
238	perf->node->dent = perf->ent;
239	perf->node->info_ent = NULL;
240
241	mutex_lock(&minor->debugfs_lock);
242	list_add(&perf->node->list, &minor->debugfs_list);
243	mutex_unlock(&minor->debugfs_lock);
244
245	return 0;
246
247	fail:
248	msm_perf_debugfs_cleanup(minor);
249	return -1;
250	}
251
252	void msm_perf_debugfs_cleanup(struct drm_minor *minor)
253	{
254	struct msm_drm_private *priv = minor->dev->dev_private;
255	struct msm_perf_state *perf = priv->perf;
256
257	if (!perf)
258	return;
259
260	priv->perf = NULL;
261
262	debugfs_remove(perf->ent);
263
264	if (perf->node) {
265	mutex_lock(&minor->debugfs_lock);
266	list_del(&perf->node->list);
267	mutex_unlock(&minor->debugfs_lock);
268	kfree(perf->node);
269	}
270
271	mutex_destroy(&perf->read_lock);
272
273	kfree(perf);
274	}
275
276	#endif