mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
f8cf6e513e
The sysfs_emit() and sysfs_emit_at() functions were introduced to make
it less ambiguous which function is preferred when writing to the output
buffer in a device attribute's "show" callback [1].
Convert the PCI sysfs object "show" functions from sprintf(), snprintf()
and scnprintf() to sysfs_emit() and sysfs_emit_at() accordingly, as the
latter is aware of the PAGE_SIZE buffer and correctly returns the number
of bytes written into the buffer.
No functional change intended.
[1] Documentation/filesystems/sysfs.rst
Related commit: ad025f8e46 ("PCI/sysfs: Use sysfs_emit() and
sysfs_emit_at() in "show" functions").
Link: https://lore.kernel.org/r/20210603000112.703037-2-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
124 lines
2.5 KiB
C
124 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Interface for Dynamic Logical Partitioning of I/O Slots on
|
|
* RPA-compliant PPC64 platform.
|
|
*
|
|
* John Rose <johnrose@austin.ibm.com>
|
|
* October 2003
|
|
*
|
|
* Copyright (C) 2003 IBM.
|
|
*/
|
|
#include <linux/kobject.h>
|
|
#include <linux/string.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci_hotplug.h>
|
|
#include "rpaphp.h"
|
|
#include "rpadlpar.h"
|
|
#include "../pci.h"
|
|
|
|
#define DLPAR_KOBJ_NAME "control"
|
|
|
|
/* Those two have no quotes because they are passed to __ATTR() which
|
|
* stringifies the argument (yuck !)
|
|
*/
|
|
#define ADD_SLOT_ATTR_NAME add_slot
|
|
#define REMOVE_SLOT_ATTR_NAME remove_slot
|
|
|
|
static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t nbytes)
|
|
{
|
|
char drc_name[MAX_DRC_NAME_LEN];
|
|
char *end;
|
|
int rc;
|
|
|
|
if (nbytes >= MAX_DRC_NAME_LEN)
|
|
return 0;
|
|
|
|
strscpy(drc_name, buf, nbytes + 1);
|
|
|
|
end = strchr(drc_name, '\n');
|
|
if (end)
|
|
*end = '\0';
|
|
|
|
rc = dlpar_add_slot(drc_name);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static ssize_t add_slot_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sysfs_emit(buf, "0\n");
|
|
}
|
|
|
|
static ssize_t remove_slot_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t nbytes)
|
|
{
|
|
char drc_name[MAX_DRC_NAME_LEN];
|
|
int rc;
|
|
char *end;
|
|
|
|
if (nbytes >= MAX_DRC_NAME_LEN)
|
|
return 0;
|
|
|
|
strscpy(drc_name, buf, nbytes + 1);
|
|
|
|
end = strchr(drc_name, '\n');
|
|
if (end)
|
|
*end = '\0';
|
|
|
|
rc = dlpar_remove_slot(drc_name);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static ssize_t remove_slot_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sysfs_emit(buf, "0\n");
|
|
}
|
|
|
|
static struct kobj_attribute add_slot_attr =
|
|
__ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
|
|
|
|
static struct kobj_attribute remove_slot_attr =
|
|
__ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
|
|
|
|
static struct attribute *default_attrs[] = {
|
|
&add_slot_attr.attr,
|
|
&remove_slot_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group dlpar_attr_group = {
|
|
.attrs = default_attrs,
|
|
};
|
|
|
|
static struct kobject *dlpar_kobj;
|
|
|
|
int dlpar_sysfs_init(void)
|
|
{
|
|
int error;
|
|
|
|
dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
|
|
&pci_slots_kset->kobj);
|
|
if (!dlpar_kobj)
|
|
return -EINVAL;
|
|
|
|
error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
|
|
if (error)
|
|
kobject_put(dlpar_kobj);
|
|
return error;
|
|
}
|
|
|
|
void dlpar_sysfs_exit(void)
|
|
{
|
|
sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
|
|
kobject_put(dlpar_kobj);
|
|
}
|