[mirror_ubuntu-zesty-kernel.git] / arch / s390 / pci / pci_debug.c

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