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Commit 2fe7641c authored by Jordan Crouse's avatar Jordan Crouse
Browse files

msm: ksgl: Add debugfs file to show active GPU events 



Add a debugfs file (/d/kgsl/events) to show the current list of
active groups and events.

Change-Id: Ic0dedbad2d171b1d4b94770f06f55c09cd05cce1
Signed-off-by: default avatarJordan Crouse <jcrouse@codeaurora.org>
parent 63875384

drivers/gpu/msm/kgsl.c

+5 −3
Original line number Diff line number Diff line
@@ -430,6 +430,7 @@ int kgsl_context_init(struct kgsl_device_private *dev_priv, 
{

	int ret = 0, id;

	struct kgsl_device *device = dev_priv->device;

	char name[64];



	idr_preload(GFP_KERNEL);

	write_lock(&device->context_lock);
@@ -468,7 +469,8 @@ int kgsl_context_init(struct kgsl_device_private *dev_priv, 
	if (ret)

		goto fail_free_id;



	kgsl_add_event_group(&context->events, context);

	snprintf(name, sizeof(name), "context-%d", id);

	kgsl_add_event_group(&context->events, context, name);



	return 0;

fail_free_id:
@@ -4229,8 +4231,8 @@ int kgsl_device_platform_probe(struct kgsl_device *device) 


	device->events_wq = create_workqueue("kgsl-events");



	kgsl_add_event_group(&device->global_events, NULL);

	kgsl_add_event_group(&device->iommu_events, NULL);

	kgsl_add_event_group(&device->global_events, NULL, "global");

	kgsl_add_event_group(&device->iommu_events, NULL, "iommu");



	/* Initalize the snapshot engine */

	kgsl_device_snapshot_init(device);

drivers/gpu/msm/kgsl_device.h

+3 −1
Original line number Diff line number Diff line
@@ -206,6 +206,7 @@ struct kgsl_event { 
 * @events: List of active GPU events

 * @group: Node for the master group list

 * @processed: Last processed timestamp

 * @name: String name for the group (for the debugfs file)

 */

struct kgsl_event_group {

	struct kgsl_context *context;
@@ -213,6 +214,7 @@ struct kgsl_event_group { 
	struct list_head events;

	struct list_head group;

	unsigned int processed;

	char name[64];

};



/**
@@ -589,7 +591,7 @@ void kgsl_events_exit(void); 


void kgsl_del_event_group(struct kgsl_event_group *group);

void kgsl_add_event_group(struct kgsl_event_group *group,

		struct kgsl_context *context);

		struct kgsl_context *context, const char *name);



void kgsl_cancel_events_timestamp(struct kgsl_device *device,

		struct kgsl_event_group *group, unsigned int timestamp);

drivers/gpu/msm/kgsl_events.c

+69 −1
Original line number Diff line number Diff line
@@ -14,8 +14,10 @@ 
#include <linux/slab.h>

#include <linux/list.h>

#include <linux/workqueue.h>

#include <linux/debugfs.h>

#include <kgsl_device.h>



#include "kgsl_debugfs.h"

#include "kgsl_trace.h"



/*
@@ -23,6 +25,7 @@ 
 * so frequently

 */

static struct kmem_cache *events_cache;

static struct dentry *events_dentry;



static inline void signal_event(struct kgsl_device *device,

		struct kgsl_event *event, int result)
@@ -266,19 +269,74 @@ EXPORT_SYMBOL(kgsl_del_event_group); 
 * group: Pointer to the new group to add to the list

 */

void kgsl_add_event_group(struct kgsl_event_group *group,

		struct kgsl_context *context)

		struct kgsl_context *context, const char *name)

{

	spin_lock_init(&group->lock);

	INIT_LIST_HEAD(&group->events);



	group->context = context;



	if (name)

		strlcpy(group->name, name, sizeof(group->name));



	write_lock(&group_lock);

	list_add_tail(&group->group, &group_list);

	write_unlock(&group_lock);

}

EXPORT_SYMBOL(kgsl_add_event_group);



static void events_debugfs_print_group(struct seq_file *s,

		struct kgsl_event_group *group)

{

	struct kgsl_event *event;

	unsigned int retired;



	spin_lock(&group->lock);



	seq_printf(s, "%s: last=%d\n", group->name, group->processed);



	list_for_each_entry(event, &group->events, node) {



		kgsl_readtimestamp(event->device, group->context,

			KGSL_TIMESTAMP_RETIRED, &retired);



		seq_printf(s, "\t%d:%d age=%lu func=%ps [retired=%d]\n",

			group->context ? group->context->id : 0,

			event->timestamp, jiffies  - event->created,

			event->func, retired);

	}

	spin_unlock(&group->lock);

}



static int events_debugfs_print(struct seq_file *s, void *unused)

{

	struct kgsl_event_group *group;



	seq_puts(s, "event groups:\n");

	seq_puts(s, "--------------\n");



	read_lock(&group_lock);

	list_for_each_entry(group, &group_list, group) {

		events_debugfs_print_group(s, group);

		seq_puts(s, "\n");

	}

	read_unlock(&group_lock);



	return 0;

}



static int events_debugfs_open(struct inode *inode, struct file *file)

{

	return single_open(file, events_debugfs_print, NULL);

}



static const struct file_operations events_fops = {

	.open = events_debugfs_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



/**

 * kgsl_events_exit() - Destroy the event kmem cache on module exit

 */
@@ -286,6 +344,8 @@ void kgsl_events_exit(void) 
{

	if (events_cache)

		kmem_cache_destroy(events_cache);



	debugfs_remove(events_dentry);

}



/**
@@ -293,5 +353,13 @@ void kgsl_events_exit(void) 
 */

void __init kgsl_events_init(void)

{

	struct dentry *debugfs_dir = kgsl_get_debugfs_dir();

	events_cache = KMEM_CACHE(kgsl_event, 0);



	events_dentry = debugfs_create_file("events", 0444, debugfs_dir, NULL,

		&events_fops);



	/* Failure to create a debugfs entry is non fatal */

	if (IS_ERR(events_dentry))

		events_dentry = NULL;

}