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https://github.com/torvalds/linux
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b378a98261
Include linux/io.h instead of asm/io.h everywhere. linux/io.h includes asm/io.h, so this shouldn't cause any problems. Instead this might help for some randconfig build errors which were reported due to some undefined io related functions. Also move the changed include so it stays grouped together with other includes from the same directory. For ctcm_mpc.c also remove not needed comments (actually questions). Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S390 version
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* Copyright IBM Corp. 1999, 2007
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Christian Borntraeger (cborntra@de.ibm.com),
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*/
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#define KMSG_COMPONENT "cpcmd"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/io.h>
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#include <asm/diag.h>
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#include <asm/ebcdic.h>
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#include <asm/cpcmd.h>
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static DEFINE_SPINLOCK(cpcmd_lock);
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static char cpcmd_buf[241];
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static int diag8_noresponse(int cmdlen)
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{
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asm volatile(
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" diag %[rx],%[ry],0x8\n"
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: [ry] "+&d" (cmdlen)
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: [rx] "d" (__pa(cpcmd_buf))
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: "cc");
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return cmdlen;
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}
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static int diag8_response(int cmdlen, char *response, int *rlen)
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{
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union register_pair rx, ry;
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int cc;
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rx.even = __pa(cpcmd_buf);
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rx.odd = __pa(response);
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ry.even = cmdlen | 0x40000000L;
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ry.odd = *rlen;
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asm volatile(
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" diag %[rx],%[ry],0x8\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=&d" (cc), [ry] "+&d" (ry.pair)
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: [rx] "d" (rx.pair)
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: "cc");
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if (cc)
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*rlen += ry.odd;
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else
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*rlen = ry.odd;
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return ry.even;
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}
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/*
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* __cpcmd has some restrictions over cpcmd
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* - __cpcmd is unlocked and therefore not SMP-safe
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*/
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int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
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{
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int cmdlen;
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int rc;
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int response_len;
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cmdlen = strlen(cmd);
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BUG_ON(cmdlen > 240);
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memcpy(cpcmd_buf, cmd, cmdlen);
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ASCEBC(cpcmd_buf, cmdlen);
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diag_stat_inc(DIAG_STAT_X008);
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if (response) {
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memset(response, 0, rlen);
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response_len = rlen;
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rc = diag8_response(cmdlen, response, &rlen);
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EBCASC(response, response_len);
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} else {
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rc = diag8_noresponse(cmdlen);
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}
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if (response_code)
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*response_code = rc;
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return rlen;
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}
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EXPORT_SYMBOL(__cpcmd);
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int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
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{
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unsigned long flags;
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char *lowbuf;
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int len;
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if (is_vmalloc_or_module_addr(response)) {
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lowbuf = kmalloc(rlen, GFP_KERNEL);
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if (!lowbuf) {
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pr_warn("The cpcmd kernel function failed to allocate a response buffer\n");
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return -ENOMEM;
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}
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spin_lock_irqsave(&cpcmd_lock, flags);
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len = __cpcmd(cmd, lowbuf, rlen, response_code);
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spin_unlock_irqrestore(&cpcmd_lock, flags);
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memcpy(response, lowbuf, rlen);
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kfree(lowbuf);
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} else {
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spin_lock_irqsave(&cpcmd_lock, flags);
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len = __cpcmd(cmd, response, rlen, response_code);
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spin_unlock_irqrestore(&cpcmd_lock, flags);
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}
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return len;
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}
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EXPORT_SYMBOL(cpcmd);
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