[linux-block.git] / arch / s390 / pci / pci_debug.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright IBM Corp. 2012,2015
 *
 *  Author(s):
 *    Jan Glauber <jang@linux.vnet.ibm.com>
 */

#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/kernel.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/pci.h>
#include <asm/debug.h>

#include <asm/pci_dma.h>

static struct dentry *debugfs_root;
debug_info_t *pci_debug_msg_id;
EXPORT_SYMBOL_GPL(pci_debug_msg_id);
debug_info_t *pci_debug_err_id;
EXPORT_SYMBOL_GPL(pci_debug_err_id);

static char *pci_common_names[] = {
	"Load operations",
	"Store operations",
	"Store block operations",
	"Refresh operations",
};

static char *pci_fmt0_names[] = {
	"DMA read bytes",
	"DMA write bytes",
};

static char *pci_fmt1_names[] = {
	"Received bytes",
	"Received packets",
	"Transmitted bytes",
	"Transmitted packets",
};

static char *pci_fmt2_names[] = {
	"Consumed work units",
	"Maximum work units",
};

static char *pci_fmt3_names[] = {
	"Transmitted bytes",
};

static char *pci_sw_names[] = {
	"Allocated pages",
	"Mapped pages",
	"Unmapped pages",
};

static void pci_fmb_show(struct seq_file *m, char *name[], int length,
			 u64 *data)
{
	int i;

	for (i = 0; i < length; i++, data++)
		seq_printf(m, "%26s:\t%llu\n", name[i], *data);
}

static void pci_sw_counter_show(struct seq_file *m)
{
	struct zpci_dev *zdev = m->private;
	atomic64_t *counter = &zdev->allocated_pages;
	int i;

	for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
		seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
			   atomic64_read(counter));
}

static int pci_perf_show(struct seq_file *m, void *v)
{
	struct zpci_dev *zdev = m->private;

	if (!zdev)
		return 0;

	mutex_lock(&zdev->lock);
	if (!zdev->fmb) {
		mutex_unlock(&zdev->lock);
		seq_puts(m, "FMB statistics disabled\n");
		return 0;
	}

	/* header */
	seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
	seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
	seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);

	pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
		     &zdev->fmb->ld_ops);

	switch (zdev->fmb->format) {
	case 0:
		if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
			break;
		pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
			     &zdev->fmb->fmt0.dma_rbytes);
		break;
	case 1:
		pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
			     &zdev->fmb->fmt1.rx_bytes);
		break;
	case 2:
		pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
			     &zdev->fmb->fmt2.consumed_work_units);
		break;
	case 3:
		pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
			     &zdev->fmb->fmt3.tx_bytes);
		break;
	default:
		seq_puts(m, "Unknown format\n");
	}

	pci_sw_counter_show(m);
	mutex_unlock(&zdev->lock);
	return 0;
}

static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
				  size_t count, loff_t *off)
{
	struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
	unsigned long val;
	int rc;

	if (!zdev)
		return 0;

	rc = kstrtoul_from_user(ubuf, count, 10, &val);
	if (rc)
		return rc;

	mutex_lock(&zdev->lock);
	switch (val) {
	case 0:
		rc = zpci_fmb_disable_device(zdev);
		break;
	case 1:
		rc = zpci_fmb_enable_device(zdev);
		break;
	}
	mutex_unlock(&zdev->lock);
	return rc ? rc : count;
}

static int pci_perf_seq_open(struct inode *inode, struct file *filp)
{
	return single_open(filp, pci_perf_show,
			   file_inode(filp)->i_private);
}

static const struct file_operations debugfs_pci_perf_fops = {
	.open	 = pci_perf_seq_open,
	.read	 = seq_read,
	.write	 = pci_perf_seq_write,
	.llseek  = seq_lseek,
	.release = single_release,
};

void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
{
	zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);

	debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR,
			    zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops);
}

void zpci_debug_exit_device(struct zpci_dev *zdev)
{
	debugfs_remove_recursive(zdev->debugfs_dev);
}

int __init zpci_debug_init(void)
{
	/* event trace buffer */
	pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
	if (!pci_debug_msg_id)
		return -EINVAL;
	debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
	debug_set_level(pci_debug_msg_id, 3);

	/* error log */
	pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
	if (!pci_debug_err_id)
		return -EINVAL;
	debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
	debug_set_level(pci_debug_err_id, 3);

	debugfs_root = debugfs_create_dir("pci", NULL);
	return 0;
}

void zpci_debug_exit(void)
{
	debug_unregister(pci_debug_msg_id);
	debug_unregister(pci_debug_err_id);
	debugfs_remove(debugfs_root);
}
Commit	Line	Data
adbb3901	1	// SPDX-License-Identifier: GPL-2.0
d0b08853	2	/*
f9dc447e	3	* Copyright IBM Corp. 2012,2015
d0b08853 JG	4	*
	5	* Author(s):
	6	* Jan Glauber <jang@linux.vnet.ibm.com>
	7	*/
	8
896cb7e6 GS	9	#define KMSG_COMPONENT "zpci"
896cb7e6 GS	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
d0b08853 JG	11
	12	#include <linux/kernel.h>
	13	#include <linux/seq_file.h>
	14	#include <linux/debugfs.h>
a2ab8333	15	#include <linux/export.h>
d0b08853 JG	16	#include <linux/pci.h>
	17	#include <asm/debug.h>
	18
	19	#include <asm/pci_dma.h>
	20
	21	static struct dentry *debugfs_root;
a2ab8333 SO	22	debug_info_t *pci_debug_msg_id;
	23	EXPORT_SYMBOL_GPL(pci_debug_msg_id);
	24	debug_info_t *pci_debug_err_id;
	25	EXPORT_SYMBOL_GPL(pci_debug_err_id);
d0b08853	26
f9dc447e	27	static char *pci_common_names[] = {
d0b08853 JG	28	"Load operations",
	29	"Store operations",
	30	"Store block operations",
	31	"Refresh operations",
f9dc447e SO	32	};
	33
	34	static char *pci_fmt0_names[] = {
d0b08853 JG	35	"DMA read bytes",
d0b08853 JG	36	"DMA write bytes",
6001018a SO	37	};
6001018a SO	38
f9dc447e SO	39	static char *pci_fmt1_names[] = {
	40	"Received bytes",
	41	"Received packets",
	42	"Transmitted bytes",
	43	"Transmitted packets",
	44	};
	45
	46	static char *pci_fmt2_names[] = {
	47	"Consumed work units",
	48	"Maximum work units",
	49	};
	50
0ac94282 SO	51	static char *pci_fmt3_names[] = {
	52	"Transmitted bytes",
	53	};
	54
6001018a	55	static char *pci_sw_names[] = {
d0b08853 JG	56	"Allocated pages",
	57	"Mapped pages",
	58	"Unmapped pages",
	59	};
	60
f9dc447e SO	61	static void pci_fmb_show(struct seq_file m, char name[], int length,
	62	u64 *data)
	63	{
	64	int i;
	65
	66	for (i = 0; i < length; i++, data++)
	67	seq_printf(m, "%26s:\t%llu\n", name[i], *data);
	68	}
	69
6001018a SO	70	static void pci_sw_counter_show(struct seq_file *m)
	71	{
	72	struct zpci_dev *zdev = m->private;
	73	atomic64_t *counter = &zdev->allocated_pages;
	74	int i;
	75
	76	for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
982164d6	77	seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
6a6a9d5f	78	atomic64_read(counter));
6001018a SO	79	}
6001018a SO	80
d0b08853 JG	81	static int pci_perf_show(struct seq_file m, void v)
	82	{
	83	struct zpci_dev *zdev = m->private;
d0b08853 JG	84
	85	if (!zdev)
	86	return 0;
80ed156a SO	87
80ed156a SO	88	mutex_lock(&zdev->lock);
c2f0b61d	89	if (!zdev->fmb) {
80ed156a	90	mutex_unlock(&zdev->lock);
c2f0b61d JP	91	seq_puts(m, "FMB statistics disabled\n");
	92	return 0;
	93	}
d0b08853 JG	94
d0b08853 JG	95	/* header */
d0b08853 JG	96	seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
	97	seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
	98	seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
	99
f9dc447e SO	100	pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
	101	&zdev->fmb->ld_ops);
	102
	103	switch (zdev->fmb->format) {
	104	case 0:
	105	if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
	106	break;
	107	pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
	108	&zdev->fmb->fmt0.dma_rbytes);
	109	break;
	110	case 1:
	111	pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
	112	&zdev->fmb->fmt1.rx_bytes);
	113	break;
	114	case 2:
	115	pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
	116	&zdev->fmb->fmt2.consumed_work_units);
	117	break;
0ac94282 SO	118	case 3:
	119	pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
	120	&zdev->fmb->fmt3.tx_bytes);
	121	break;
f9dc447e SO	122	default:
	123	seq_puts(m, "Unknown format\n");
	124	}
d0b08853	125
6001018a	126	pci_sw_counter_show(m);
80ed156a	127	mutex_unlock(&zdev->lock);
d0b08853 JG	128	return 0;
	129	}
	130
	131	static ssize_t pci_perf_seq_write(struct file file, const char __user ubuf,
	132	size_t count, loff_t *off)
	133	{
	134	struct zpci_dev zdev = ((struct seq_file ) file->private_data)->private;
	135	unsigned long val;
	136	int rc;
	137
	138	if (!zdev)
	139	return 0;
	140
	141	rc = kstrtoul_from_user(ubuf, count, 10, &val);
	142	if (rc)
	143	return rc;
	144
80ed156a	145	mutex_lock(&zdev->lock);
d0b08853 JG	146	switch (val) {
	147	case 0:
	148	rc = zpci_fmb_disable_device(zdev);
d0b08853 JG	149	break;
	150	case 1:
	151	rc = zpci_fmb_enable_device(zdev);
d0b08853 JG	152	break;
d0b08853 JG	153	}
80ed156a SO	154	mutex_unlock(&zdev->lock);
80ed156a SO	155	return rc ? rc : count;
d0b08853 JG	156	}
	157
	158	static int pci_perf_seq_open(struct inode inode, struct file filp)
	159	{
	160	return single_open(filp, pci_perf_show,
496ad9aa	161	file_inode(filp)->i_private);
d0b08853 JG	162	}
	163
	164	static const struct file_operations debugfs_pci_perf_fops = {
	165	.open = pci_perf_seq_open,
	166	.read = seq_read,
	167	.write = pci_perf_seq_write,
	168	.llseek = seq_lseek,
	169	.release = single_release,
	170	};
	171
9a99649f	172	void zpci_debug_init_device(struct zpci_dev zdev, const char name)
d0b08853	173	{
9a99649f	174	zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
d7f2f7c7 GKH	175
	176	debugfs_create_file("statistics", S_IFREG \| S_IRUGO \| S_IWUSR,
	177	zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops);
d0b08853 JG	178	}
	179
	180	void zpci_debug_exit_device(struct zpci_dev *zdev)
	181	{
d7f2f7c7	182	debugfs_remove_recursive(zdev->debugfs_dev);
d0b08853 JG	183	}
	184
	185	int __init zpci_debug_init(void)
	186	{
	187	/* event trace buffer */
f7e1e65d	188	pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
d0b08853 JG	189	if (!pci_debug_msg_id)
	190	return -EINVAL;
	191	debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
	192	debug_set_level(pci_debug_msg_id, 3);
d0b08853 JG	193
	194	/* error log */
	195	pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
	196	if (!pci_debug_err_id)
	197	return -EINVAL;
	198	debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
52c79e63	199	debug_set_level(pci_debug_err_id, 3);
d0b08853 JG	200
	201	debugfs_root = debugfs_create_dir("pci", NULL);
	202	return 0;
	203	}
	204
	205	void zpci_debug_exit(void)
	206	{
8c080bd0 ME	207	debug_unregister(pci_debug_msg_id);
8c080bd0 ME	208	debug_unregister(pci_debug_err_id);
d0b08853 JG	209	debugfs_remove(debugfs_root);
d0b08853 JG	210	}