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/*
* Copyright IBM Corp. 2012
*
* 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_perf_names[] = {
/* hardware counters */
"Load operations",
"Store operations",
"Store block operations",
"Refresh operations",
"DMA read bytes",
"DMA write bytes",
};
static char *pci_sw_names[] = {
"Allocated pages",
"Mapped pages",
"Unmapped pages",
};
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;
u64 *stat;
int i;
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);
/* hardware counters */
stat = (u64 *) &zdev->fmb->ld_ops;
for (i = 0; i < 4; i++)
seq_printf(m, "%26s:\t%llu\n",
pci_perf_names[i], *(stat + i));
if (zdev->fmb->dma_valid)
for (i = 4; i < 6; i++)
seq_printf(m, "%26s:\t%llu\n",
pci_perf_names[i], *(stat + i));
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)
{
zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
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);
}
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