[mirror_ubuntu-bionic-kernel.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_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%lu\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, "FMB @ %p\n", zdev->fmb);
	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;
	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);
	if (IS_ERR(zdev->debugfs_dev))
		zdev->debugfs_dev = NULL;

	zdev->debugfs_perf = debugfs_create_file("statistics",
				S_IFREG | S_IRUGO | S_IWUSR,
				zdev->debugfs_dev, zdev,
				&debugfs_pci_perf_fops);
	if (IS_ERR(zdev->debugfs_perf))
		zdev->debugfs_perf = NULL;
}

void zpci_debug_exit_device(struct zpci_dev *zdev)
{
	debugfs_remove(zdev->debugfs_perf);
	debugfs_remove(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, 6);

	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
6001018a	51	static char *pci_sw_names[] = {
d0b08853 JG	52	"Allocated pages",
	53	"Mapped pages",
	54	"Unmapped pages",
	55	};
	56
f9dc447e SO	57	static void pci_fmb_show(struct seq_file m, char name[], int length,
	58	u64 *data)
	59	{
	60	int i;
	61
	62	for (i = 0; i < length; i++, data++)
	63	seq_printf(m, "%26s:\t%llu\n", name[i], *data);
	64	}
	65
6001018a SO	66	static void pci_sw_counter_show(struct seq_file *m)
	67	{
	68	struct zpci_dev *zdev = m->private;
	69	atomic64_t *counter = &zdev->allocated_pages;
	70	int i;
	71
	72	for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
126b30c3	73	seq_printf(m, "%26s:\t%lu\n", pci_sw_names[i],
6001018a SO	74	atomic64_read(counter));
	75	}
	76
d0b08853 JG	77	static int pci_perf_show(struct seq_file m, void v)
	78	{
	79	struct zpci_dev *zdev = m->private;
d0b08853 JG	80
	81	if (!zdev)
	82	return 0;
80ed156a SO	83
80ed156a SO	84	mutex_lock(&zdev->lock);
c2f0b61d	85	if (!zdev->fmb) {
80ed156a	86	mutex_unlock(&zdev->lock);
c2f0b61d JP	87	seq_puts(m, "FMB statistics disabled\n");
	88	return 0;
	89	}
d0b08853 JG	90
	91	/* header */
	92	seq_printf(m, "FMB @ %p\n", zdev->fmb);
	93	seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
	94	seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
	95	seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
	96
f9dc447e SO	97	pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
	98	&zdev->fmb->ld_ops);
	99
	100	switch (zdev->fmb->format) {
	101	case 0:
	102	if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
	103	break;
	104	pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
	105	&zdev->fmb->fmt0.dma_rbytes);
	106	break;
	107	case 1:
	108	pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
	109	&zdev->fmb->fmt1.rx_bytes);
	110	break;
	111	case 2:
	112	pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
	113	&zdev->fmb->fmt2.consumed_work_units);
	114	break;
	115	default:
	116	seq_puts(m, "Unknown format\n");
	117	}
d0b08853	118
6001018a	119	pci_sw_counter_show(m);
80ed156a	120	mutex_unlock(&zdev->lock);
d0b08853 JG	121	return 0;
	122	}
	123
	124	static ssize_t pci_perf_seq_write(struct file file, const char __user ubuf,
	125	size_t count, loff_t *off)
	126	{
	127	struct zpci_dev zdev = ((struct seq_file ) file->private_data)->private;
	128	unsigned long val;
	129	int rc;
	130
	131	if (!zdev)
	132	return 0;
	133
	134	rc = kstrtoul_from_user(ubuf, count, 10, &val);
	135	if (rc)
	136	return rc;
	137
80ed156a	138	mutex_lock(&zdev->lock);
d0b08853 JG	139	switch (val) {
	140	case 0:
	141	rc = zpci_fmb_disable_device(zdev);
d0b08853 JG	142	break;
	143	case 1:
	144	rc = zpci_fmb_enable_device(zdev);
d0b08853 JG	145	break;
d0b08853 JG	146	}
80ed156a SO	147	mutex_unlock(&zdev->lock);
80ed156a SO	148	return rc ? rc : count;
d0b08853 JG	149	}
	150
	151	static int pci_perf_seq_open(struct inode inode, struct file filp)
	152	{
	153	return single_open(filp, pci_perf_show,
496ad9aa	154	file_inode(filp)->i_private);
d0b08853 JG	155	}
	156
	157	static const struct file_operations debugfs_pci_perf_fops = {
	158	.open = pci_perf_seq_open,
	159	.read = seq_read,
	160	.write = pci_perf_seq_write,
	161	.llseek = seq_lseek,
	162	.release = single_release,
	163	};
	164
9a99649f	165	void zpci_debug_init_device(struct zpci_dev zdev, const char name)
d0b08853	166	{
9a99649f	167	zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
d0b08853 JG	168	if (IS_ERR(zdev->debugfs_dev))
	169	zdev->debugfs_dev = NULL;
	170
	171	zdev->debugfs_perf = debugfs_create_file("statistics",
	172	S_IFREG \| S_IRUGO \| S_IWUSR,
	173	zdev->debugfs_dev, zdev,
	174	&debugfs_pci_perf_fops);
	175	if (IS_ERR(zdev->debugfs_perf))
	176	zdev->debugfs_perf = NULL;
d0b08853 JG	177	}
	178
	179	void zpci_debug_exit_device(struct zpci_dev *zdev)
	180	{
	181	debugfs_remove(zdev->debugfs_perf);
d0b08853 JG	182	debugfs_remove(zdev->debugfs_dev);
	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);
	199	debug_set_level(pci_debug_err_id, 6);
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	}