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diag14() is currently only used by the vmur device driver. The third parameter, called subcommand, determines the type of the first parameter. For some subcommands the value of the first parameter is an address to a memory buffer and needs virtual to physical address conversion. Other subcommands interpret the first parameter is an integer. This doesn't fix a bug since virtual and physical addresses are currently the same. Suggested-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
300 lines
8.3 KiB
C
300 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Implementation of s390 diagnose codes
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*
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* Copyright IBM Corp. 2007
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* Author(s): Michael Holzheu <holzheu@de.ibm.com>
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*/
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/vmalloc.h>
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#include <asm/asm-extable.h>
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#include <asm/diag.h>
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#include <asm/trace/diag.h>
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#include <asm/sections.h>
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#include "entry.h"
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struct diag_stat {
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unsigned int counter[NR_DIAG_STAT];
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};
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static DEFINE_PER_CPU(struct diag_stat, diag_stat);
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struct diag_desc {
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int code;
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char *name;
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};
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static const struct diag_desc diag_map[NR_DIAG_STAT] = {
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[DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
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[DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
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[DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
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[DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
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[DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
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[DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
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[DIAG_STAT_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" },
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[DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
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[DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
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[DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
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[DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
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[DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
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[DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
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[DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
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[DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
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[DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
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[DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
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[DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
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[DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
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[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
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[DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
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[DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" },
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[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
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};
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struct diag_ops __amode31_ref diag_amode31_ops = {
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.diag210 = _diag210_amode31,
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.diag26c = _diag26c_amode31,
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.diag14 = _diag14_amode31,
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.diag0c = _diag0c_amode31,
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.diag8c = _diag8c_amode31,
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.diag308_reset = _diag308_reset_amode31
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};
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static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
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struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
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static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data");
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static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31;
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static int show_diag_stat(struct seq_file *m, void *v)
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{
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struct diag_stat *stat;
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unsigned long n = (unsigned long) v - 1;
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int cpu, prec, tmp;
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cpus_read_lock();
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if (n == 0) {
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seq_puts(m, " ");
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for_each_online_cpu(cpu) {
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prec = 10;
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for (tmp = 10; cpu >= tmp; tmp *= 10)
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prec--;
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seq_printf(m, "%*s%d", prec, "CPU", cpu);
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}
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seq_putc(m, '\n');
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} else if (n <= NR_DIAG_STAT) {
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seq_printf(m, "diag %03x:", diag_map[n-1].code);
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for_each_online_cpu(cpu) {
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stat = &per_cpu(diag_stat, cpu);
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seq_printf(m, " %10u", stat->counter[n-1]);
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}
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seq_printf(m, " %s\n", diag_map[n-1].name);
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}
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cpus_read_unlock();
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return 0;
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}
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static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
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{
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return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
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}
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static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return show_diag_stat_start(m, pos);
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}
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static void show_diag_stat_stop(struct seq_file *m, void *v)
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{
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}
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static const struct seq_operations show_diag_stat_sops = {
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.start = show_diag_stat_start,
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.next = show_diag_stat_next,
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.stop = show_diag_stat_stop,
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.show = show_diag_stat,
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};
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DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
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static int __init show_diag_stat_init(void)
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{
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debugfs_create_file("diag_stat", 0400, NULL, NULL,
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&show_diag_stat_fops);
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return 0;
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}
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device_initcall(show_diag_stat_init);
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void diag_stat_inc(enum diag_stat_enum nr)
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{
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this_cpu_inc(diag_stat.counter[nr]);
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trace_s390_diagnose(diag_map[nr].code);
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}
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EXPORT_SYMBOL(diag_stat_inc);
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void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
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{
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this_cpu_inc(diag_stat.counter[nr]);
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trace_s390_diagnose_norecursion(diag_map[nr].code);
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}
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EXPORT_SYMBOL(diag_stat_inc_norecursion);
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/*
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* Diagnose 0c: Pseudo Timer
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*/
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void diag0c(struct hypfs_diag0c_entry *data)
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{
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diag_stat_inc(DIAG_STAT_X00C);
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diag_amode31_ops.diag0c(virt_to_phys(data));
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}
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/*
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* Diagnose 14: Input spool file manipulation
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*
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* The subcode parameter determines the type of the first parameter rx.
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* Currently used are the following 3 subcommands:
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* 0x0: Read the Next Spool File Buffer (Data Record)
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* 0x28: Position a Spool File to the Designated Record
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* 0xfff: Retrieve Next File Descriptor
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*
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* For subcommands 0x0 and 0xfff, the value of the first parameter is
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* a virtual address of a memory buffer and needs virtual to physical
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* address translation. For other subcommands the rx parameter is not
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* a virtual address.
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*/
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int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
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{
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diag_stat_inc(DIAG_STAT_X014);
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switch (subcode) {
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case 0x0:
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case 0xfff:
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rx = virt_to_phys((void *)rx);
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break;
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default:
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/* Do nothing */
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break;
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}
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return diag_amode31_ops.diag14(rx, ry1, subcode);
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}
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EXPORT_SYMBOL(diag14);
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static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
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{
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union register_pair rp = { .even = *subcode, .odd = size };
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asm volatile(
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" diag %[addr],%[rp],0x204\n"
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"0: nopr %%r7\n"
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EX_TABLE(0b,0b)
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: [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
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*subcode = rp.even;
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return rp.odd;
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}
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/**
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* diag204() - Issue diagnose 204 call.
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* @subcode: Subcode of diagnose 204 to be executed.
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* @size: Size of area in pages which @area points to, if given.
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* @addr: Vmalloc'ed memory area where the result is written to.
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*
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* Execute diagnose 204 with the given subcode and write the result to the
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* memory area specified with @addr. For subcodes which do not write a
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* result to memory both @size and @addr must be zero. If @addr is
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* specified it must be page aligned and must have been allocated with
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* vmalloc(). Conversion to real / physical addresses will be handled by
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* this function if required.
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*/
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int diag204(unsigned long subcode, unsigned long size, void *addr)
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{
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if (addr) {
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if (WARN_ON_ONCE(!is_vmalloc_addr(addr)))
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return -1;
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if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE)))
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return -1;
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}
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if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4)
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addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr));
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diag_stat_inc(DIAG_STAT_X204);
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size = __diag204(&subcode, size, addr);
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if (subcode)
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return -1;
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return size;
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}
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EXPORT_SYMBOL(diag204);
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/*
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* Diagnose 210: Get information about a virtual device
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*/
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int diag210(struct diag210 *addr)
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{
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static DEFINE_SPINLOCK(diag210_lock);
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unsigned long flags;
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int ccode;
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spin_lock_irqsave(&diag210_lock, flags);
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*__diag210_tmp_amode31 = *addr;
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diag_stat_inc(DIAG_STAT_X210);
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ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
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*addr = *__diag210_tmp_amode31;
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spin_unlock_irqrestore(&diag210_lock, flags);
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return ccode;
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}
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EXPORT_SYMBOL(diag210);
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/*
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* Diagnose 8C: Access 3270 Display Device Information
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*/
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int diag8c(struct diag8c *addr, struct ccw_dev_id *devno)
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{
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static DEFINE_SPINLOCK(diag8c_lock);
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unsigned long flags;
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int ccode;
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spin_lock_irqsave(&diag8c_lock, flags);
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diag_stat_inc(DIAG_STAT_X08C);
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ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr));
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*addr = *__diag8c_tmp_amode31;
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spin_unlock_irqrestore(&diag8c_lock, flags);
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return ccode;
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}
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EXPORT_SYMBOL(diag8c);
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int diag224(void *ptr)
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{
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unsigned long addr = __pa(ptr);
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int rc = -EOPNOTSUPP;
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diag_stat_inc(DIAG_STAT_X224);
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asm volatile(
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" diag %1,%2,0x224\n"
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"0: lhi %0,0x0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (rc) :"d" (0), "d" (addr) : "memory");
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return rc;
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}
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EXPORT_SYMBOL(diag224);
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/*
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* Diagnose 26C: Access Certain System Information
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*/
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int diag26c(void *req, void *resp, enum diag26c_sc subcode)
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{
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diag_stat_inc(DIAG_STAT_X26C);
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return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode);
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}
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EXPORT_SYMBOL(diag26c);
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