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drm/tegra: virt: Expose engine load in debugfs

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Add a debugfs file (in a poor location) that shows the engine load
based on actmon information.

Bug 3973633

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Change-Id: I60e18aa064c89a89e62099a1e468f2e5b2beb265
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2864720
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Mikko Perttunen
2023-02-28 11:14:06 +02:00
committed by Laxman Dewangan
parent 0c4db82587
commit 4af997528e
1 changed files with 69 additions and 0 deletions
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69
drivers/gpu/drm/tegra/virt.c
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@@ -3,6 +3,8 @@
* Copyright (c) 2022, NVIDIA Corporation.
*/
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/host1x-next.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -10,6 +12,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/seq_file.h>
#include <linux/version.h>
#include <soc/tegra/virt/hv-ivc.h>
@@ -39,6 +42,9 @@ struct virt_engine {
int connection_id;
struct tegra_drm_client client;
struct dentry *actmon_debugfs_dir;
struct clk *clk;
};
static DEFINE_MUTEX(ivc_cookie_lock);
@@ -242,6 +248,60 @@ static int virt_engine_resume(struct device *dev)
return virt_engine_transfer(&msg, sizeof(msg));
}
static int actmon_debugfs_usage_show(struct seq_file *s, void *unused)
{
struct virt_engine *virt = s->private;
unsigned long rate;
int count;
rate = clk_get_rate(virt->clk);
if (rate == 0) {
seq_printf(s, "0\n");
return 0;
}
count = host1x_actmon_read_avg_count(&virt->client.base);
if (count < 0)
return count;
/* Based on configuration in NvHost Server */
#define ACTMON_SAMPLE_PERIOD_US 100
/* Rate in MHz cancels out microseconds */
int cycles_per_actmon_sample = (rate / 1000000) * ACTMON_SAMPLE_PERIOD_US;
seq_printf(s, "%d\n", (count * 1000) / cycles_per_actmon_sample);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(actmon_debugfs_usage);
static void virt_engine_setup_actmon_debugfs(struct virt_engine *virt)
{
const char *name;
switch (virt->client.base.class) {
case HOST1X_CLASS_VIC:
name = "vic";
break;
case HOST1X_CLASS_NVENC:
name = "msenc";
break;
case HOST1X_CLASS_NVDEC:
name = "nvdec";
break;
default:
return;
}
virt->actmon_debugfs_dir = debugfs_create_dir(name, NULL);
debugfs_create_file("usage", S_IRUGO, virt->actmon_debugfs_dir, virt, &actmon_debugfs_usage_fops);
}
static void virt_engine_cleanup_actmon_debugfs(struct virt_engine *virt)
{
debugfs_remove_recursive(virt->actmon_debugfs_dir);
}
static const struct of_device_id tegra_virt_engine_of_match[] = {
{ .compatible = "nvidia,tegra234-host1x-virtual-engine" },
{ },
@@ -280,6 +340,12 @@ static int virt_engine_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, virt);
virt->clk = devm_clk_get_optional(&pdev->dev, NULL);
if (IS_ERR(virt->clk)) {
dev_err(dev, "could not get clock: %d\n", PTR_ERR(virt->clk));
return PTR_ERR(virt->clk);
}
INIT_LIST_HEAD(&virt->client.base.list);
virt->client.base.ops = &virt_engine_client_ops;
virt->client.base.dev = dev;
@@ -312,6 +378,8 @@ static int virt_engine_probe(struct platform_device *pdev)
goto cleanup_ivc;
}
virt_engine_setup_actmon_debugfs(virt);
return 0;
cleanup_ivc:
@@ -327,6 +395,7 @@ static int virt_engine_remove(struct platform_device *pdev)
struct virt_engine *virt_engine = platform_get_drvdata(pdev);
int err;
virt_engine_cleanup_actmon_debugfs(virt_engine);
virt_engine_cleanup();
err = host1x_client_unregister(&virt_engine->client.base);