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0b4d414714
The semantic effect of insert_at_head is that it would allow new registered sysctl entries to override existing sysctl entries of the same name. Which is pain for caching and the proc interface never implemented. I have done an audit and discovered that none of the current users of register_sysctl care as (excpet for directories) they do not register duplicate sysctl entries. So this patch simply removes the support for overriding existing entries in the sys_sysctl interface since no one uses it or cares and it makes future enhancments harder. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Andi Kleen <ak@muc.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Corey Minyard <minyard@acm.org> Cc: Neil Brown <neilb@suse.de> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Jan Kara <jack@ucw.cz> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Mark Fasheh <mark.fasheh@oracle.com> Cc: David Chinner <dgc@sgi.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
224 lines
4.5 KiB
C
224 lines
4.5 KiB
C
/* sysctl.c: implementation of /proc/sys files relating to FRV specifically
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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static const char frv_cache_wback[] = "wback";
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static const char frv_cache_wthru[] = "wthru";
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static void frv_change_dcache_mode(unsigned long newmode)
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{
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unsigned long flags, hsr0;
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local_irq_save(flags);
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hsr0 = __get_HSR(0);
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hsr0 &= ~HSR0_DCE;
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__set_HSR(0, hsr0);
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asm volatile(" dcef @(gr0,gr0),#1 \n"
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" membar \n"
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: : : "memory"
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);
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hsr0 = (hsr0 & ~HSR0_CBM) | newmode;
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__set_HSR(0, hsr0);
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hsr0 |= HSR0_DCE;
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__set_HSR(0, hsr0);
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local_irq_restore(flags);
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//printk("HSR0 now %08lx\n", hsr0);
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}
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/*****************************************************************************/
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/*
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* handle requests to dynamically switch the write caching mode delivered by /proc
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*/
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static int procctl_frv_cachemode(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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unsigned long hsr0;
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char buff[8];
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int len;
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len = *lenp;
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if (write) {
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/* potential state change */
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if (len <= 1 || len > sizeof(buff) - 1)
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return -EINVAL;
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if (copy_from_user(buff, buffer, len) != 0)
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return -EFAULT;
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if (buff[len - 1] == '\n')
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buff[len - 1] = '\0';
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else
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buff[len] = '\0';
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if (strcmp(buff, frv_cache_wback) == 0) {
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/* switch dcache into write-back mode */
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frv_change_dcache_mode(HSR0_CBM_COPY_BACK);
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return 0;
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}
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if (strcmp(buff, frv_cache_wthru) == 0) {
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/* switch dcache into write-through mode */
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frv_change_dcache_mode(HSR0_CBM_WRITE_THRU);
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return 0;
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}
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return -EINVAL;
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}
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/* read the state */
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if (filp->f_pos > 0) {
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*lenp = 0;
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return 0;
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}
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hsr0 = __get_HSR(0);
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switch (hsr0 & HSR0_CBM) {
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case HSR0_CBM_WRITE_THRU:
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memcpy(buff, frv_cache_wthru, sizeof(frv_cache_wthru) - 1);
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buff[sizeof(frv_cache_wthru) - 1] = '\n';
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len = sizeof(frv_cache_wthru);
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break;
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default:
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memcpy(buff, frv_cache_wback, sizeof(frv_cache_wback) - 1);
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buff[sizeof(frv_cache_wback) - 1] = '\n';
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len = sizeof(frv_cache_wback);
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break;
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}
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if (len > *lenp)
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len = *lenp;
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if (copy_to_user(buffer, buff, len) != 0)
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return -EFAULT;
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*lenp = len;
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filp->f_pos = len;
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return 0;
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} /* end procctl_frv_cachemode() */
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/*****************************************************************************/
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/*
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* permit the mm_struct the nominated process is using have its MMU context ID pinned
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*/
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#ifdef CONFIG_MMU
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static int procctl_frv_pin_cxnr(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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pid_t pid;
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char buff[16], *p;
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int len;
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len = *lenp;
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if (write) {
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/* potential state change */
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if (len <= 1 || len > sizeof(buff) - 1)
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return -EINVAL;
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if (copy_from_user(buff, buffer, len) != 0)
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return -EFAULT;
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if (buff[len - 1] == '\n')
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buff[len - 1] = '\0';
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else
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buff[len] = '\0';
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pid = simple_strtoul(buff, &p, 10);
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if (*p)
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return -EINVAL;
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return cxn_pin_by_pid(pid);
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}
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/* read the currently pinned CXN */
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if (filp->f_pos > 0) {
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*lenp = 0;
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return 0;
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}
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len = snprintf(buff, sizeof(buff), "%d\n", cxn_pinned);
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if (len > *lenp)
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len = *lenp;
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if (copy_to_user(buffer, buff, len) != 0)
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return -EFAULT;
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*lenp = len;
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filp->f_pos = len;
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return 0;
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} /* end procctl_frv_pin_cxnr() */
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#endif
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/*
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* FR-V specific sysctls
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*/
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static struct ctl_table frv_table[] =
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{
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{
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.ctl_name = 1,
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.procname = "cache-mode",
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.data = NULL,
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.maxlen = 0,
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.mode = 0644,
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.proc_handler = &procctl_frv_cachemode,
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},
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#ifdef CONFIG_MMU
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{
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.ctl_name = 2,
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.procname = "pin-cxnr",
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.data = NULL,
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.maxlen = 0,
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.mode = 0644,
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.proc_handler = &procctl_frv_pin_cxnr
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},
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#endif
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{}
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};
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/*
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* Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
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* when all the PM interfaces exist nicely.
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*/
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static struct ctl_table frv_dir_table[] =
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{
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{
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.ctl_name = CTL_FRV,
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.procname = "frv",
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.mode = 0555,
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.child = frv_table
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},
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{}
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};
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/*
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* Initialize power interface
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*/
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static int __init frv_sysctl_init(void)
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{
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register_sysctl_table(frv_dir_table);
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return 0;
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}
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__initcall(frv_sysctl_init);
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