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7b595756ec
linux/drivers/scsi/arcmsr/arcmsr_attr.c
Tejun Heo 7b595756ec sysfs: kill unnecessary attribute->owner 
sysfs is now completely out of driver/module lifetime game.  After
deletion, a sysfs node doesn't access anything outside sysfs proper,
so there's no reason to hold onto the attribute owners.  Note that
often the wrong modules were accounted for as owners leading to
accessing removed modules.

This patch kills now unnecessary attribute->owner.  Note that with
this change, userland holding a sysfs node does not prevent the
backing module from being unloaded.

For more info regarding lifetime rule cleanup, please read the
following message.

  http://article.gmane.org/gmane.linux.kernel/510293

(tweaked by Greg to not delete the field just yet, to make it easier to
merge things properly.)

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-07-11 16:09:06 -07:00

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/*
*******************************************************************************
** O.S : Linux
** FILE NAME : arcmsr_attr.c
** BY : Erich Chen
** Description: attributes exported to sysfs and device host
*******************************************************************************
** Copyright (C) 2002 - 2005, Areca Technology Corporation All rights reserved
**
** Web site: www.areca.com.tw
** E-mail: erich@areca.com.tw
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License version 2 as
** published by the Free Software Foundation.
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
*******************************************************************************
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING,BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION)HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE)ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************
** For history of changes, see Documentation/scsi/ChangeLog.arcmsr
** Firmware Specification, see Documentation/scsi/arcmsr_spec.txt
*******************************************************************************
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include "arcmsr.h"
struct class_device_attribute *arcmsr_host_attrs[];
static ssize_t
arcmsr_sysfs_iop_message_read(struct kobject *kobj, char *buf, loff_t off,
size_t count)
{
struct class_device *cdev = container_of(kobj,struct class_device,kobj);
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
struct MessageUnit __iomem *reg = acb->pmu;
uint8_t *pQbuffer,*ptmpQbuffer;
int32_t allxfer_len = 0;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
/* do message unit read. */
ptmpQbuffer = (uint8_t *)buf;
while ((acb->rqbuf_firstindex != acb->rqbuf_lastindex)
&& (allxfer_len < 1031)) {
pQbuffer = &acb->rqbuffer[acb->rqbuf_firstindex];
memcpy(ptmpQbuffer, pQbuffer, 1);
acb->rqbuf_firstindex++;
acb->rqbuf_firstindex %= ARCMSR_MAX_QBUFFER;
ptmpQbuffer++;
allxfer_len++;
}
if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
struct QBUFFER __iomem * prbuffer = (struct QBUFFER __iomem *)
&reg->message_rbuffer;
uint8_t __iomem * iop_data = (uint8_t __iomem *)prbuffer->data;
int32_t iop_len;
acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
iop_len = readl(&prbuffer->data_len);
while (iop_len > 0) {
acb->rqbuffer[acb->rqbuf_lastindex] = readb(iop_data);
acb->rqbuf_lastindex++;
acb->rqbuf_lastindex %= ARCMSR_MAX_QBUFFER;
iop_data++;
iop_len--;
}
writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK,
&reg->inbound_doorbell);
}
return (allxfer_len);
}
static ssize_t
arcmsr_sysfs_iop_message_write(struct kobject *kobj, char *buf, loff_t off,
size_t count)
{
struct class_device *cdev = container_of(kobj,struct class_device,kobj);
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
int32_t my_empty_len, user_len, wqbuf_firstindex, wqbuf_lastindex;
uint8_t *pQbuffer, *ptmpuserbuffer;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (count > 1032)
return -EINVAL;
/* do message unit write. */
ptmpuserbuffer = (uint8_t *)buf;
user_len = (int32_t)count;
wqbuf_lastindex = acb->wqbuf_lastindex;
wqbuf_firstindex = acb->wqbuf_firstindex;
if (wqbuf_lastindex != wqbuf_firstindex) {
arcmsr_post_Qbuffer(acb);
return 0; /*need retry*/
} else {
my_empty_len = (wqbuf_firstindex-wqbuf_lastindex - 1)
&(ARCMSR_MAX_QBUFFER - 1);
if (my_empty_len >= user_len) {
while (user_len > 0) {
pQbuffer =
&acb->wqbuffer[acb->wqbuf_lastindex];
memcpy(pQbuffer, ptmpuserbuffer, 1);
acb->wqbuf_lastindex++;
acb->wqbuf_lastindex %= ARCMSR_MAX_QBUFFER;
ptmpuserbuffer++;
user_len--;
}
if (acb->acb_flags & ACB_F_MESSAGE_WQBUFFER_CLEARED) {
acb->acb_flags &=
~ACB_F_MESSAGE_WQBUFFER_CLEARED;
arcmsr_post_Qbuffer(acb);
}
return count;
} else {
return 0; /*need retry*/
}
}
}
static ssize_t
arcmsr_sysfs_iop_message_clear(struct kobject *kobj, char *buf, loff_t off,
size_t count)
{
struct class_device *cdev = container_of(kobj,struct class_device,kobj);
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
struct MessageUnit __iomem *reg = acb->pmu;
uint8_t *pQbuffer;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK
, &reg->inbound_doorbell);
}
acb->acb_flags |=
(ACB_F_MESSAGE_WQBUFFER_CLEARED
| ACB_F_MESSAGE_RQBUFFER_CLEARED
| ACB_F_MESSAGE_WQBUFFER_READED);
acb->rqbuf_firstindex = 0;
acb->rqbuf_lastindex = 0;
acb->wqbuf_firstindex = 0;
acb->wqbuf_lastindex = 0;
pQbuffer = acb->rqbuffer;
memset(pQbuffer, 0, sizeof (struct QBUFFER));
pQbuffer = acb->wqbuffer;
memset(pQbuffer, 0, sizeof (struct QBUFFER));
return 1;
}
static struct bin_attribute arcmsr_sysfs_message_read_attr = {
.attr = {
.name = "mu_read",
.mode = S_IRUSR ,
},
.size = 1032,
.read = arcmsr_sysfs_iop_message_read,
};
static struct bin_attribute arcmsr_sysfs_message_write_attr = {
.attr = {
.name = "mu_write",
.mode = S_IWUSR,
},
.size = 1032,
.write = arcmsr_sysfs_iop_message_write,
};
static struct bin_attribute arcmsr_sysfs_message_clear_attr = {
.attr = {
.name = "mu_clear",
.mode = S_IWUSR,
},
.size = 1,
.write = arcmsr_sysfs_iop_message_clear,
};
int arcmsr_alloc_sysfs_attr(struct AdapterControlBlock *acb)
{
struct Scsi_Host *host = acb->host;
int error;
error = sysfs_create_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_read_attr);
if (error) {
printk(KERN_ERR "arcmsr: alloc sysfs mu_read failed\n");
goto error_bin_file_message_read;
}
error = sysfs_create_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_write_attr);
if (error) {
printk(KERN_ERR "arcmsr: alloc sysfs mu_write failed\n");
goto error_bin_file_message_write;
}
error = sysfs_create_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_clear_attr);
if (error) {
printk(KERN_ERR "arcmsr: alloc sysfs mu_clear failed\n");
goto error_bin_file_message_clear;
}
return 0;
error_bin_file_message_clear:
sysfs_remove_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_write_attr);
error_bin_file_message_write:
sysfs_remove_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_read_attr);
error_bin_file_message_read:
return error;
}
void
arcmsr_free_sysfs_attr(struct AdapterControlBlock *acb) {
struct Scsi_Host *host = acb->host;
sysfs_remove_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_clear_attr);
sysfs_remove_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_write_attr);
sysfs_remove_bin_file(&host->shost_classdev.kobj,
&arcmsr_sysfs_message_read_attr);
}
static ssize_t
arcmsr_attr_host_driver_version(struct class_device *cdev, char *buf) {
return snprintf(buf, PAGE_SIZE,
"%s\n",
ARCMSR_DRIVER_VERSION);
}
static ssize_t
arcmsr_attr_host_driver_posted_cmd(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%4d\n",
atomic_read(&acb->ccboutstandingcount));
}
static ssize_t
arcmsr_attr_host_driver_reset(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%4d\n",
acb->num_resets);
}
static ssize_t
arcmsr_attr_host_driver_abort(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%4d\n",
acb->num_aborts);
}
static ssize_t
arcmsr_attr_host_fw_model(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%s\n",
acb->firm_model);
}
static ssize_t
arcmsr_attr_host_fw_version(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%s\n",
acb->firm_version);
}
static ssize_t
arcmsr_attr_host_fw_request_len(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%4d\n",
acb->firm_request_len);
}
static ssize_t
arcmsr_attr_host_fw_numbers_queue(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%4d\n",
acb->firm_numbers_queue);
}
static ssize_t
arcmsr_attr_host_fw_sdram_size(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%4d\n",
acb->firm_sdram_size);
}
static ssize_t
arcmsr_attr_host_fw_hd_channels(struct class_device *cdev, char *buf) {
struct Scsi_Host *host = class_to_shost(cdev);
struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
return snprintf(buf, PAGE_SIZE,
"%4d\n",
acb->firm_hd_channels);
}
static CLASS_DEVICE_ATTR(host_driver_version, S_IRUGO, arcmsr_attr_host_driver_version, NULL);
static CLASS_DEVICE_ATTR(host_driver_posted_cmd, S_IRUGO, arcmsr_attr_host_driver_posted_cmd, NULL);
static CLASS_DEVICE_ATTR(host_driver_reset, S_IRUGO, arcmsr_attr_host_driver_reset, NULL);
static CLASS_DEVICE_ATTR(host_driver_abort, S_IRUGO, arcmsr_attr_host_driver_abort, NULL);
static CLASS_DEVICE_ATTR(host_fw_model, S_IRUGO, arcmsr_attr_host_fw_model, NULL);
static CLASS_DEVICE_ATTR(host_fw_version, S_IRUGO, arcmsr_attr_host_fw_version, NULL);
static CLASS_DEVICE_ATTR(host_fw_request_len, S_IRUGO, arcmsr_attr_host_fw_request_len, NULL);
static CLASS_DEVICE_ATTR(host_fw_numbers_queue, S_IRUGO, arcmsr_attr_host_fw_numbers_queue, NULL);
static CLASS_DEVICE_ATTR(host_fw_sdram_size, S_IRUGO, arcmsr_attr_host_fw_sdram_size, NULL);
static CLASS_DEVICE_ATTR(host_fw_hd_channels, S_IRUGO, arcmsr_attr_host_fw_hd_channels, NULL);
struct class_device_attribute *arcmsr_host_attrs[] = {
&class_device_attr_host_driver_version,
&class_device_attr_host_driver_posted_cmd,
&class_device_attr_host_driver_reset,
&class_device_attr_host_driver_abort,
&class_device_attr_host_fw_model,
&class_device_attr_host_fw_version,
&class_device_attr_host_fw_request_len,
&class_device_attr_host_fw_numbers_queue,
&class_device_attr_host_fw_sdram_size,
&class_device_attr_host_fw_hd_channels,
NULL,
};
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