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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: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Anup Patel 2017-08-22 15:27:04 +05:30 committed by Vinod Koul
parent b99c238669
commit 8529a927e2
1 changed files with 78 additions and 0 deletions
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78
drivers/dma/bcm-sba-raid.c
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@ -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++)