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236 lines
4.6 KiB
236 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2013 Red Hat |
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* Author: Rob Clark <[email protected]> |
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*/ |
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/* For profiling, userspace can: |
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* |
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* tail -f /sys/kernel/debug/dri/<minor>/gpu |
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* |
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* This will enable performance counters/profiling to track the busy time |
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* and any gpu specific performance counters that are supported. |
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*/ |
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#ifdef CONFIG_DEBUG_FS |
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#include <linux/debugfs.h> |
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#include <linux/uaccess.h> |
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#include <drm/drm_file.h> |
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#include "msm_drv.h" |
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#include "msm_gpu.h" |
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struct msm_perf_state { |
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struct drm_device *dev; |
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bool open; |
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int cnt; |
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struct mutex read_lock; |
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char buf[256]; |
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int buftot, bufpos; |
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unsigned long next_jiffies; |
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}; |
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#define SAMPLE_TIME (HZ/4) |
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/* wait for next sample time: */ |
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static int wait_sample(struct msm_perf_state *perf) |
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{ |
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unsigned long start_jiffies = jiffies; |
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if (time_after(perf->next_jiffies, start_jiffies)) { |
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unsigned long remaining_jiffies = |
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perf->next_jiffies - start_jiffies; |
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int ret = schedule_timeout_interruptible(remaining_jiffies); |
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if (ret > 0) { |
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/* interrupted */ |
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return -ERESTARTSYS; |
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} |
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} |
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perf->next_jiffies += SAMPLE_TIME; |
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return 0; |
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} |
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static int refill_buf(struct msm_perf_state *perf) |
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{ |
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struct msm_drm_private *priv = perf->dev->dev_private; |
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struct msm_gpu *gpu = priv->gpu; |
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char *ptr = perf->buf; |
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int rem = sizeof(perf->buf); |
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int i, n; |
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if ((perf->cnt++ % 32) == 0) { |
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/* Header line: */ |
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n = snprintf(ptr, rem, "%%BUSY"); |
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ptr += n; |
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rem -= n; |
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for (i = 0; i < gpu->num_perfcntrs; i++) { |
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const struct msm_gpu_perfcntr *perfcntr = &gpu->perfcntrs[i]; |
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n = snprintf(ptr, rem, "\t%s", perfcntr->name); |
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ptr += n; |
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rem -= n; |
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} |
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} else { |
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/* Sample line: */ |
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uint32_t activetime = 0, totaltime = 0; |
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uint32_t cntrs[5]; |
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uint32_t val; |
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int ret; |
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/* sleep until next sample time: */ |
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ret = wait_sample(perf); |
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if (ret) |
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return ret; |
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ret = msm_gpu_perfcntr_sample(gpu, &activetime, &totaltime, |
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ARRAY_SIZE(cntrs), cntrs); |
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if (ret < 0) |
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return ret; |
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val = totaltime ? 1000 * activetime / totaltime : 0; |
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n = snprintf(ptr, rem, "%3d.%d%%", val / 10, val % 10); |
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ptr += n; |
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rem -= n; |
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for (i = 0; i < ret; i++) { |
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/* cycle counters (I think).. convert to MHz.. */ |
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val = cntrs[i] / 10000; |
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n = snprintf(ptr, rem, "\t%5d.%02d", |
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val / 100, val % 100); |
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ptr += n; |
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rem -= n; |
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} |
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} |
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n = snprintf(ptr, rem, "\n"); |
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ptr += n; |
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rem -= n; |
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perf->bufpos = 0; |
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perf->buftot = ptr - perf->buf; |
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return 0; |
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} |
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static ssize_t perf_read(struct file *file, char __user *buf, |
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size_t sz, loff_t *ppos) |
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{ |
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struct msm_perf_state *perf = file->private_data; |
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int n = 0, ret = 0; |
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mutex_lock(&perf->read_lock); |
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if (perf->bufpos >= perf->buftot) { |
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ret = refill_buf(perf); |
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if (ret) |
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goto out; |
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} |
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n = min((int)sz, perf->buftot - perf->bufpos); |
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if (copy_to_user(buf, &perf->buf[perf->bufpos], n)) { |
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ret = -EFAULT; |
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goto out; |
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} |
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perf->bufpos += n; |
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*ppos += n; |
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out: |
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mutex_unlock(&perf->read_lock); |
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if (ret) |
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return ret; |
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return n; |
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} |
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static int perf_open(struct inode *inode, struct file *file) |
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{ |
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struct msm_perf_state *perf = inode->i_private; |
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struct drm_device *dev = perf->dev; |
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struct msm_drm_private *priv = dev->dev_private; |
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struct msm_gpu *gpu = priv->gpu; |
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int ret = 0; |
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if (!gpu) |
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return -ENODEV; |
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mutex_lock(&gpu->lock); |
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if (perf->open) { |
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ret = -EBUSY; |
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goto out; |
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} |
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file->private_data = perf; |
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perf->open = true; |
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perf->cnt = 0; |
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perf->buftot = 0; |
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perf->bufpos = 0; |
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msm_gpu_perfcntr_start(gpu); |
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perf->next_jiffies = jiffies + SAMPLE_TIME; |
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out: |
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mutex_unlock(&gpu->lock); |
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return ret; |
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} |
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static int perf_release(struct inode *inode, struct file *file) |
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{ |
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struct msm_perf_state *perf = inode->i_private; |
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struct msm_drm_private *priv = perf->dev->dev_private; |
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msm_gpu_perfcntr_stop(priv->gpu); |
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perf->open = false; |
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return 0; |
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} |
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static const struct file_operations perf_debugfs_fops = { |
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.owner = THIS_MODULE, |
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.open = perf_open, |
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.read = perf_read, |
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.llseek = no_llseek, |
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.release = perf_release, |
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}; |
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int msm_perf_debugfs_init(struct drm_minor *minor) |
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{ |
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struct msm_drm_private *priv = minor->dev->dev_private; |
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struct msm_perf_state *perf; |
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/* only create on first minor: */ |
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if (priv->perf) |
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return 0; |
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perf = kzalloc(sizeof(*perf), GFP_KERNEL); |
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if (!perf) |
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return -ENOMEM; |
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perf->dev = minor->dev; |
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mutex_init(&perf->read_lock); |
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priv->perf = perf; |
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debugfs_create_file("perf", S_IFREG | S_IRUGO, minor->debugfs_root, |
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perf, &perf_debugfs_fops); |
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return 0; |
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} |
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void msm_perf_debugfs_cleanup(struct msm_drm_private *priv) |
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{ |
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struct msm_perf_state *perf = priv->perf; |
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if (!perf) |
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return; |
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priv->perf = NULL; |
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mutex_destroy(&perf->read_lock); |
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kfree(perf); |
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} |
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#endif
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