drivers/pci/hotplug/rpadlpar_sysfs.c

Source file repositories/reference/linux-study-clean/drivers/pci/hotplug/rpadlpar_sysfs.c

File Facts

System
Linux kernel
Corpus path
drivers/pci/hotplug/rpadlpar_sysfs.c
Extension
.c
Size
2553 bytes
Lines
124
Domain
Representative Device Path
Bucket
PCIe NVMe Storage Path
Inferred role
Representative Device Path: implementation source
Status
source implementation candidate

Why This File Exists

Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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);

Annotation

Implementation Notes