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-rw-r--r--arch/s390/kernel/diag.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
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index 000000000..a778714e4
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+++ b/arch/s390/kernel/diag.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Implementation of s390 diagnose codes
+ *
+ * Copyright IBM Corp. 2007
+ * Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
+#include <asm/asm-extable.h>
+#include <asm/diag.h>
+#include <asm/trace/diag.h>
+#include <asm/sections.h>
+#include "entry.h"
+
+struct diag_stat {
+ unsigned int counter[NR_DIAG_STAT];
+};
+
+static DEFINE_PER_CPU(struct diag_stat, diag_stat);
+
+struct diag_desc {
+ int code;
+ char *name;
+};
+
+static const struct diag_desc diag_map[NR_DIAG_STAT] = {
+ [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
+ [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
+ [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
+ [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
+ [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
+ [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
+ [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
+ [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
+ [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
+ [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
+ [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
+ [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
+ [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
+ [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
+ [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
+ [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
+ [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
+ [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
+ [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
+ [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
+ [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
+};
+
+struct diag_ops __amode31_ref diag_amode31_ops = {
+ .diag210 = _diag210_amode31,
+ .diag26c = _diag26c_amode31,
+ .diag14 = _diag14_amode31,
+ .diag0c = _diag0c_amode31,
+ .diag308_reset = _diag308_reset_amode31
+};
+
+static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
+struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
+
+static int show_diag_stat(struct seq_file *m, void *v)
+{
+ struct diag_stat *stat;
+ unsigned long n = (unsigned long) v - 1;
+ int cpu, prec, tmp;
+
+ cpus_read_lock();
+ if (n == 0) {
+ seq_puts(m, " ");
+
+ for_each_online_cpu(cpu) {
+ prec = 10;
+ for (tmp = 10; cpu >= tmp; tmp *= 10)
+ prec--;
+ seq_printf(m, "%*s%d", prec, "CPU", cpu);
+ }
+ seq_putc(m, '\n');
+ } else if (n <= NR_DIAG_STAT) {
+ seq_printf(m, "diag %03x:", diag_map[n-1].code);
+ for_each_online_cpu(cpu) {
+ stat = &per_cpu(diag_stat, cpu);
+ seq_printf(m, " %10u", stat->counter[n-1]);
+ }
+ seq_printf(m, " %s\n", diag_map[n-1].name);
+ }
+ cpus_read_unlock();
+ return 0;
+}
+
+static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
+}
+
+static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return show_diag_stat_start(m, pos);
+}
+
+static void show_diag_stat_stop(struct seq_file *m, void *v)
+{
+}
+
+static const struct seq_operations show_diag_stat_sops = {
+ .start = show_diag_stat_start,
+ .next = show_diag_stat_next,
+ .stop = show_diag_stat_stop,
+ .show = show_diag_stat,
+};
+
+DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
+
+static int __init show_diag_stat_init(void)
+{
+ debugfs_create_file("diag_stat", 0400, NULL, NULL,
+ &show_diag_stat_fops);
+ return 0;
+}
+
+device_initcall(show_diag_stat_init);
+
+void diag_stat_inc(enum diag_stat_enum nr)
+{
+ this_cpu_inc(diag_stat.counter[nr]);
+ trace_s390_diagnose(diag_map[nr].code);
+}
+EXPORT_SYMBOL(diag_stat_inc);
+
+void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
+{
+ this_cpu_inc(diag_stat.counter[nr]);
+ trace_s390_diagnose_norecursion(diag_map[nr].code);
+}
+EXPORT_SYMBOL(diag_stat_inc_norecursion);
+
+/*
+ * Diagnose 14: Input spool file manipulation
+ */
+int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
+{
+ diag_stat_inc(DIAG_STAT_X014);
+ return diag_amode31_ops.diag14(rx, ry1, subcode);
+}
+EXPORT_SYMBOL(diag14);
+
+static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
+{
+ union register_pair rp = { .even = *subcode, .odd = size };
+
+ asm volatile(
+ " diag %[addr],%[rp],0x204\n"
+ "0: nopr %%r7\n"
+ EX_TABLE(0b,0b)
+ : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
+ *subcode = rp.even;
+ return rp.odd;
+}
+
+int diag204(unsigned long subcode, unsigned long size, void *addr)
+{
+ diag_stat_inc(DIAG_STAT_X204);
+ size = __diag204(&subcode, size, addr);
+ if (subcode)
+ return -1;
+ return size;
+}
+EXPORT_SYMBOL(diag204);
+
+/*
+ * Diagnose 210: Get information about a virtual device
+ */
+int diag210(struct diag210 *addr)
+{
+ static DEFINE_SPINLOCK(diag210_lock);
+ unsigned long flags;
+ int ccode;
+
+ spin_lock_irqsave(&diag210_lock, flags);
+ *__diag210_tmp_amode31 = *addr;
+
+ diag_stat_inc(DIAG_STAT_X210);
+ ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
+
+ *addr = *__diag210_tmp_amode31;
+ spin_unlock_irqrestore(&diag210_lock, flags);
+
+ return ccode;
+}
+EXPORT_SYMBOL(diag210);
+
+int diag224(void *ptr)
+{
+ int rc = -EOPNOTSUPP;
+
+ diag_stat_inc(DIAG_STAT_X224);
+ asm volatile(
+ " diag %1,%2,0x224\n"
+ "0: lhi %0,0x0\n"
+ "1:\n"
+ EX_TABLE(0b,1b)
+ : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
+ return rc;
+}
+EXPORT_SYMBOL(diag224);
+
+/*
+ * Diagnose 26C: Access Certain System Information
+ */
+int diag26c(void *req, void *resp, enum diag26c_sc subcode)
+{
+ diag_stat_inc(DIAG_STAT_X26C);
+ return diag_amode31_ops.diag26c(req, resp, subcode);
+}
+EXPORT_SYMBOL(diag26c);