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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+
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/*
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* Interface for Dynamic Logical Partitioning of I/O Slots on
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* RPA-compliant PPC64 platform.
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*
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* John Rose <johnrose@austin.ibm.com>
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* October 2003
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*
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* Copyright (C) 2003 IBM.
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*/
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include "rpaphp.h"
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#include "rpadlpar.h"
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#include "../pci.h"
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#define DLPAR_KOBJ_NAME "control"
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/* Those two have no quotes because they are passed to __ATTR() which
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* stringifies the argument (yuck !)
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*/
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#define ADD_SLOT_ATTR_NAME add_slot
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#define REMOVE_SLOT_ATTR_NAME remove_slot
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static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t nbytes)
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{
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char drc_name[MAX_DRC_NAME_LEN];
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char *end;
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int rc;
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if (nbytes >= MAX_DRC_NAME_LEN)
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return 0;
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strscpy(drc_name, buf, nbytes + 1);
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end = strchr(drc_name, '\n');
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if (end)
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*end = '\0';
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rc = dlpar_add_slot(drc_name);
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if (rc)
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return rc;
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return nbytes;
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}
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static ssize_t add_slot_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sysfs_emit(buf, "0\n");
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}
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static ssize_t remove_slot_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t nbytes)
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{
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char drc_name[MAX_DRC_NAME_LEN];
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int rc;
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char *end;
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if (nbytes >= MAX_DRC_NAME_LEN)
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return 0;
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strscpy(drc_name, buf, nbytes + 1);
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end = strchr(drc_name, '\n');
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if (end)
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*end = '\0';
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rc = dlpar_remove_slot(drc_name);
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if (rc)
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return rc;
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return nbytes;
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}
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static ssize_t remove_slot_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sysfs_emit(buf, "0\n");
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}
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static struct kobj_attribute add_slot_attr =
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__ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
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static struct kobj_attribute remove_slot_attr =
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__ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
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static struct attribute *default_attrs[] = {
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&add_slot_attr.attr,
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&remove_slot_attr.attr,
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NULL,
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};
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static const struct attribute_group dlpar_attr_group = {
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.attrs = default_attrs,
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};
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static struct kobject *dlpar_kobj;
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int dlpar_sysfs_init(void)
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{
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int error;
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dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
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&pci_slots_kset->kobj);
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if (!dlpar_kobj)
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return -EINVAL;
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error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
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if (error)
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kobject_put(dlpar_kobj);
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return error;
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}
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void dlpar_sysfs_exit(void)
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{
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sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
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kobject_put(dlpar_kobj);
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}
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