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8e0b986c59
There shouldn't be any 31 bit code around anymore that matters. Remove the compat layer support required to run 31 bit code. Reason for removal is code simplification and reduced test effort. Note that this comes without any deprecation warnings added to config options, or kernel messages, since most likely those would be ignored anyway. If it turns out there is still a reason to keep the compat layer this can be reverted at any time in the future. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
121 lines
2.3 KiB
C
121 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IOCTL interface for SCLP
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*
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* Copyright IBM Corp. 2012
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*
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* Author: Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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#include <linux/uaccess.h>
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#include <linux/miscdevice.h>
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/fs.h>
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#include <asm/sclp_ctl.h>
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#include <asm/sclp.h>
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#include "sclp.h"
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/*
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* Supported command words
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*/
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static unsigned int sclp_ctl_sccb_wlist[] = {
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0x00400002,
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0x00410002,
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};
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/*
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* Check if command word is supported
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*/
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static int sclp_ctl_cmdw_supported(unsigned int cmdw)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(sclp_ctl_sccb_wlist); i++) {
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if (cmdw == sclp_ctl_sccb_wlist[i])
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return 1;
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}
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return 0;
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}
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static void __user *u64_to_uptr(u64 value)
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{
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return (void __user *)(unsigned long)value;
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}
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/*
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* Start SCLP request
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*/
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static int sclp_ctl_ioctl_sccb(void __user *user_area)
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{
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struct sclp_ctl_sccb ctl_sccb;
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struct sccb_header *sccb;
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unsigned long copied;
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int rc;
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if (copy_from_user(&ctl_sccb, user_area, sizeof(ctl_sccb)))
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return -EFAULT;
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if (!sclp_ctl_cmdw_supported(ctl_sccb.cmdw))
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return -EOPNOTSUPP;
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sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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copied = PAGE_SIZE -
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copy_from_user(sccb, u64_to_uptr(ctl_sccb.sccb), PAGE_SIZE);
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if (offsetof(struct sccb_header, length) +
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sizeof(sccb->length) > copied || sccb->length > copied) {
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rc = -EFAULT;
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goto out_free;
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}
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if (sccb->length < 8) {
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rc = -EINVAL;
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goto out_free;
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}
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rc = sclp_sync_request(ctl_sccb.cmdw, sccb);
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if (rc)
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goto out_free;
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if (copy_to_user(u64_to_uptr(ctl_sccb.sccb), sccb, sccb->length))
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rc = -EFAULT;
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out_free:
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free_page((unsigned long) sccb);
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return rc;
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}
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/*
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* SCLP SCCB ioctl function
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*/
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static long sclp_ctl_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp;
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argp = (void __user *)arg;
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switch (cmd) {
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case SCLP_CTL_SCCB:
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return sclp_ctl_ioctl_sccb(argp);
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default: /* unknown ioctl number */
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return -ENOTTY;
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}
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}
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/*
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* File operations
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*/
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static const struct file_operations sclp_ctl_fops = {
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.owner = THIS_MODULE,
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.open = nonseekable_open,
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.unlocked_ioctl = sclp_ctl_ioctl,
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};
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/*
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* Misc device definition
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*/
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static struct miscdevice sclp_ctl_device = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "sclp",
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.fops = &sclp_ctl_fops,
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};
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builtin_misc_device(sclp_ctl_device);
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