Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 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; |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | #define SAMPLE_TIME (HZ/4) |
| 47 | |
| 48 | /* wait for next sample time: */ |
| 49 | static int wait_sample(struct msm_perf_state *perf) |
| 50 | { |
| 51 | unsigned long start_jiffies = jiffies; |
| 52 | |
| 53 | if (time_after(perf->next_jiffies, start_jiffies)) { |
| 54 | unsigned long remaining_jiffies = |
| 55 | perf->next_jiffies - start_jiffies; |
| 56 | int ret = schedule_timeout_interruptible(remaining_jiffies); |
| 57 | if (ret > 0) { |
| 58 | /* interrupted */ |
| 59 | return -ERESTARTSYS; |
| 60 | } |
| 61 | } |
| 62 | perf->next_jiffies += SAMPLE_TIME; |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int refill_buf(struct msm_perf_state *perf) |
| 67 | { |
| 68 | struct msm_drm_private *priv = perf->dev->dev_private; |
| 69 | struct msm_gpu *gpu = priv->gpu; |
| 70 | char *ptr = perf->buf; |
| 71 | int rem = sizeof(perf->buf); |
| 72 | int i, n; |
| 73 | |
| 74 | if ((perf->cnt++ % 32) == 0) { |
| 75 | /* Header line: */ |
| 76 | n = snprintf(ptr, rem, "%%BUSY"); |
| 77 | ptr += n; |
| 78 | rem -= n; |
| 79 | |
| 80 | for (i = 0; i < gpu->num_perfcntrs; i++) { |
| 81 | const struct msm_gpu_perfcntr *perfcntr = &gpu->perfcntrs[i]; |
| 82 | n = snprintf(ptr, rem, "\t%s", perfcntr->name); |
| 83 | ptr += n; |
| 84 | rem -= n; |
| 85 | } |
| 86 | } else { |
| 87 | /* Sample line: */ |
| 88 | uint32_t activetime = 0, totaltime = 0; |
| 89 | uint32_t cntrs[5]; |
| 90 | uint32_t val; |
| 91 | int ret; |
| 92 | |
| 93 | /* sleep until next sample time: */ |
| 94 | ret = wait_sample(perf); |
| 95 | if (ret) |
| 96 | return ret; |
| 97 | |
| 98 | ret = msm_gpu_perfcntr_sample(gpu, &activetime, &totaltime, |
| 99 | ARRAY_SIZE(cntrs), cntrs); |
| 100 | if (ret < 0) |
| 101 | return ret; |
| 102 | |
| 103 | val = totaltime ? 1000 * activetime / totaltime : 0; |
| 104 | n = snprintf(ptr, rem, "%3d.%d%%", val / 10, val % 10); |
| 105 | ptr += n; |
| 106 | rem -= n; |
| 107 | |
| 108 | for (i = 0; i < ret; i++) { |
| 109 | /* cycle counters (I think).. convert to MHz.. */ |
| 110 | val = cntrs[i] / 10000; |
| 111 | n = snprintf(ptr, rem, "\t%5d.%02d", |
| 112 | val / 100, val % 100); |
| 113 | ptr += n; |
| 114 | rem -= n; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | n = snprintf(ptr, rem, "\n"); |
| 119 | ptr += n; |
| 120 | rem -= n; |
| 121 | |
| 122 | perf->bufpos = 0; |
| 123 | perf->buftot = ptr - perf->buf; |
| 124 | |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | static ssize_t perf_read(struct file *file, char __user *buf, |
| 129 | size_t sz, loff_t *ppos) |
| 130 | { |
| 131 | struct msm_perf_state *perf = file->private_data; |
Dan Carpenter | 5745d21 | 2016-07-13 13:35:29 +0300 | [diff] [blame] | 132 | int n = 0, ret = 0; |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 133 | |
| 134 | mutex_lock(&perf->read_lock); |
| 135 | |
| 136 | if (perf->bufpos >= perf->buftot) { |
| 137 | ret = refill_buf(perf); |
| 138 | if (ret) |
| 139 | goto out; |
| 140 | } |
| 141 | |
| 142 | n = min((int)sz, perf->buftot - perf->bufpos); |
Dan Carpenter | 5745d21 | 2016-07-13 13:35:29 +0300 | [diff] [blame] | 143 | if (copy_to_user(buf, &perf->buf[perf->bufpos], n)) { |
| 144 | ret = -EFAULT; |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 145 | goto out; |
Dan Carpenter | 5745d21 | 2016-07-13 13:35:29 +0300 | [diff] [blame] | 146 | } |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 147 | |
| 148 | perf->bufpos += n; |
| 149 | *ppos += n; |
| 150 | |
| 151 | out: |
| 152 | mutex_unlock(&perf->read_lock); |
| 153 | if (ret) |
| 154 | return ret; |
| 155 | return n; |
| 156 | } |
| 157 | |
| 158 | static int perf_open(struct inode *inode, struct file *file) |
| 159 | { |
| 160 | struct msm_perf_state *perf = inode->i_private; |
| 161 | struct drm_device *dev = perf->dev; |
| 162 | struct msm_drm_private *priv = dev->dev_private; |
| 163 | struct msm_gpu *gpu = priv->gpu; |
| 164 | int ret = 0; |
| 165 | |
| 166 | mutex_lock(&dev->struct_mutex); |
| 167 | |
| 168 | if (perf->open || !gpu) { |
| 169 | ret = -EBUSY; |
| 170 | goto out; |
| 171 | } |
| 172 | |
| 173 | file->private_data = perf; |
| 174 | perf->open = true; |
| 175 | perf->cnt = 0; |
| 176 | perf->buftot = 0; |
| 177 | perf->bufpos = 0; |
| 178 | msm_gpu_perfcntr_start(gpu); |
| 179 | perf->next_jiffies = jiffies + SAMPLE_TIME; |
| 180 | |
| 181 | out: |
| 182 | mutex_unlock(&dev->struct_mutex); |
| 183 | return ret; |
| 184 | } |
| 185 | |
| 186 | static int perf_release(struct inode *inode, struct file *file) |
| 187 | { |
| 188 | struct msm_perf_state *perf = inode->i_private; |
| 189 | struct msm_drm_private *priv = perf->dev->dev_private; |
| 190 | msm_gpu_perfcntr_stop(priv->gpu); |
| 191 | perf->open = false; |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | |
| 196 | static const struct file_operations perf_debugfs_fops = { |
| 197 | .owner = THIS_MODULE, |
| 198 | .open = perf_open, |
| 199 | .read = perf_read, |
| 200 | .llseek = no_llseek, |
| 201 | .release = perf_release, |
| 202 | }; |
| 203 | |
| 204 | int msm_perf_debugfs_init(struct drm_minor *minor) |
| 205 | { |
| 206 | struct msm_drm_private *priv = minor->dev->dev_private; |
| 207 | struct msm_perf_state *perf; |
Noralf Trønnes | 81895b5 | 2017-01-26 23:56:11 +0100 | [diff] [blame] | 208 | struct dentry *ent; |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 209 | |
| 210 | /* only create on first minor: */ |
| 211 | if (priv->perf) |
| 212 | return 0; |
| 213 | |
| 214 | perf = kzalloc(sizeof(*perf), GFP_KERNEL); |
| 215 | if (!perf) |
| 216 | return -ENOMEM; |
| 217 | |
| 218 | perf->dev = minor->dev; |
| 219 | |
| 220 | mutex_init(&perf->read_lock); |
| 221 | priv->perf = perf; |
| 222 | |
Noralf Trønnes | 81895b5 | 2017-01-26 23:56:11 +0100 | [diff] [blame] | 223 | ent = debugfs_create_file("perf", S_IFREG | S_IRUGO, |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 224 | minor->debugfs_root, perf, &perf_debugfs_fops); |
Noralf Trønnes | 81895b5 | 2017-01-26 23:56:11 +0100 | [diff] [blame] | 225 | if (!ent) { |
Al Viro | bcd599e | 2016-08-07 12:22:20 -0400 | [diff] [blame] | 226 | DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/perf\n", |
| 227 | minor->debugfs_root); |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 228 | goto fail; |
| 229 | } |
| 230 | |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 231 | return 0; |
| 232 | |
| 233 | fail: |
Noralf Trønnes | 85eac47 | 2017-03-07 21:49:22 +0100 | [diff] [blame] | 234 | msm_perf_debugfs_cleanup(priv); |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 235 | return -1; |
| 236 | } |
| 237 | |
Noralf Trønnes | 85eac47 | 2017-03-07 21:49:22 +0100 | [diff] [blame] | 238 | void msm_perf_debugfs_cleanup(struct msm_drm_private *priv) |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 239 | { |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 240 | struct msm_perf_state *perf = priv->perf; |
| 241 | |
| 242 | if (!perf) |
| 243 | return; |
| 244 | |
| 245 | priv->perf = NULL; |
| 246 | |
Rob Clark | 70c70f0 | 2014-05-30 14:49:43 -0400 | [diff] [blame] | 247 | mutex_destroy(&perf->read_lock); |
| 248 | |
| 249 | kfree(perf); |
| 250 | } |
| 251 | |
| 252 | #endif |