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Commit 8529a927 authored by Anup Patel's avatar Anup Patel Committed by Vinod Koul
Browse files

dmaengine: bcm-sba-raid: Add debugfs support 



This patch adds debugfs support to report stats via debugfs
which in-turn will help debug hang or error situations.

Signed-off-by: default avatarAnup Patel <anup.patel@broadcom.com>
Reviewed-by: default avatarRay Jui <ray.jui@broadcom.com>
Reviewed-by: default avatarScott Branden <scott.branden@broadcom.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent b99c2386

drivers/dma/bcm-sba-raid.c

+78 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 
 */



#include <linux/bitops.h>

#include <linux/debugfs.h>

#include <linux/dma-mapping.h>

#include <linux/dmaengine.h>

#include <linux/list.h>
@@ -162,6 +163,9 @@ struct sba_device { 
	struct list_head reqs_completed_list;

	struct list_head reqs_aborted_list;

	struct list_head reqs_free_list;

	/* DebugFS directory entries */

	struct dentry *root;

	struct dentry *stats;

};



/* ====== Command helper routines ===== */
@@ -486,6 +490,45 @@ static void sba_process_received_request(struct sba_device *sba, 
	}

}



static void sba_write_stats_in_seqfile(struct sba_device *sba,

				       struct seq_file *file)

{

	unsigned long flags;

	struct sba_request *req;

	u32 free_count = 0, alloced_count = 0, pending_count = 0;

	u32 active_count = 0, aborted_count = 0, completed_count = 0;



	spin_lock_irqsave(&sba->reqs_lock, flags);



	list_for_each_entry(req, &sba->reqs_free_list, node)

		free_count++;



	list_for_each_entry(req, &sba->reqs_alloc_list, node)

		alloced_count++;



	list_for_each_entry(req, &sba->reqs_pending_list, node)

		pending_count++;



	list_for_each_entry(req, &sba->reqs_active_list, node)

		active_count++;



	list_for_each_entry(req, &sba->reqs_aborted_list, node)

		aborted_count++;



	list_for_each_entry(req, &sba->reqs_completed_list, node)

		completed_count++;



	spin_unlock_irqrestore(&sba->reqs_lock, flags);



	seq_printf(file, "maximum requests   = %d\n", sba->max_req);

	seq_printf(file, "free requests      = %d\n", free_count);

	seq_printf(file, "alloced requests   = %d\n", alloced_count);

	seq_printf(file, "pending requests   = %d\n", pending_count);

	seq_printf(file, "active requests    = %d\n", active_count);

	seq_printf(file, "aborted requests   = %d\n", aborted_count);

	seq_printf(file, "completed requests = %d\n", completed_count);

}



/* ====== DMAENGINE callbacks ===== */



static void sba_free_chan_resources(struct dma_chan *dchan)
@@ -1451,6 +1494,19 @@ static void sba_receive_message(struct mbox_client *cl, void *msg) 
	sba_process_received_request(sba, req);

}



/* ====== Debugfs callbacks ====== */



static int sba_debugfs_stats_show(struct seq_file *file, void *offset)

{

	struct platform_device *pdev = to_platform_device(file->private);

	struct sba_device *sba = platform_get_drvdata(pdev);



	/* Write stats in file */

	sba_write_stats_in_seqfile(sba, file);



	return 0;

}



/* ====== Platform driver routines ===== */



static int sba_prealloc_channel_resources(struct sba_device *sba)
@@ -1721,6 +1777,25 @@ static int sba_probe(struct platform_device *pdev) 
	if (ret)

		goto fail_free_mchans;



	/* Check availability of debugfs */

	if (!debugfs_initialized())

		goto skip_debugfs;



	/* Create debugfs root entry */

	sba->root = debugfs_create_dir(dev_name(sba->dev), NULL);

	if (IS_ERR_OR_NULL(sba->root)) {

		dev_err(sba->dev, "failed to create debugfs root entry\n");

		sba->root = NULL;

		goto skip_debugfs;

	}



	/* Create debugfs stats entry */

	sba->stats = debugfs_create_devm_seqfile(sba->dev, "stats", sba->root,

						 sba_debugfs_stats_show);

	if (IS_ERR_OR_NULL(sba->stats))

		dev_err(sba->dev, "failed to create debugfs stats file\n");

skip_debugfs:



	/* Register DMA device with Linux async framework */

	ret = sba_async_register(sba);

	if (ret)
@@ -1734,6 +1809,7 @@ static int sba_probe(struct platform_device *pdev) 
	return 0;



fail_free_resources:

	debugfs_remove_recursive(sba->root);

	sba_freeup_channel_resources(sba);

fail_free_mchans:

	for (i = 0; i < sba->mchans_count; i++)
@@ -1748,6 +1824,8 @@ static int sba_remove(struct platform_device *pdev) 


	dma_async_device_unregister(&sba->dma_dev);



	debugfs_remove_recursive(sba->root);



	sba_freeup_channel_resources(sba);



	for (i = 0; i < sba->mchans_count; i++)