linux_dsm_epyc7002/arch/s390/pci/pci_debug.c

211 lines
4.7 KiB
C
Raw Normal View History

// 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++)
locking/atomic, s390/pci: Prepare for atomic64_read() conversion The return type of atomic64_read() varies by architecture. It may return long (e.g. powerpc), long long (e.g. arm), or s64 (e.g. x86_64). This is somewhat painful, and mandates the use of explicit casts in some cases (e.g. when printing the return value). To ameliorate matters, subsequent patches will make the atomic64 API consistently use s64. As a preparatory step, this patch updates the s390 pci debug code to treat the return value of atomic64_read() as s64, using an explicit cast. This cast will be removed once the s64 conversion is complete. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: aou@eecs.berkeley.edu Cc: arnd@arndb.de Cc: bp@alien8.de Cc: catalin.marinas@arm.com Cc: davem@davemloft.net Cc: fenghua.yu@intel.com Cc: herbert@gondor.apana.org.au Cc: ink@jurassic.park.msu.ru Cc: jhogan@kernel.org Cc: linux@armlinux.org.uk Cc: mattst88@gmail.com Cc: mpe@ellerman.id.au Cc: palmer@sifive.com Cc: paul.burton@mips.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: rth@twiddle.net Cc: tony.luck@intel.com Cc: vgupta@synopsys.com Link: https://lkml.kernel.org/r/20190522132250.26499-3-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-05-22 20:22:34 +07:00
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, 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);
}