1 files changed, 269 insertions, 0 deletions
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
new file mode 100644
index 0000000000..f9f06cd8fc
--- /dev/null
+++ b/arch/s390/kernel/diag.c
@@ -0,0 +1,269 @@
+// 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 <linux/vmalloc.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_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" },
+	[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_X320] = { .code = 0x320, .name = "Certificate Store" },
+	[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,
+	.diag8c = _diag8c_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 struct diag8c _diag8c_tmp_amode31 __section(".amode31.data");
+static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_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;
+}
+
+/**
+ * diag204() - Issue diagnose 204 call.
+ * @subcode: Subcode of diagnose 204 to be executed.
+ * @size: Size of area in pages which @area points to, if given.
+ * @addr: Vmalloc'ed memory area where the result is written to.
+ *
+ * Execute diagnose 204 with the given subcode and write the result to the
+ * memory area specified with @addr. For subcodes which do not write a
+ * result to memory both @size and @addr must be zero. If @addr is
+ * specified it must be page aligned and must have been allocated with
+ * vmalloc(). Conversion to real / physical addresses will be handled by
+ * this function if required.
+ */
+int diag204(unsigned long subcode, unsigned long size, void *addr)
+{
+	if (addr) {
+		if (WARN_ON_ONCE(!is_vmalloc_addr(addr)))
+			return -1;
+		if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE)))
+			return -1;
+	}
+	if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4)
+		addr = (void *)pfn_to_phys(vmalloc_to_pfn(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);
+
+/*
+ * Diagnose 8C: Access 3270 Display Device Information
+ */
+int diag8c(struct diag8c *addr, struct ccw_dev_id *devno)
+{
+	static DEFINE_SPINLOCK(diag8c_lock);
+	unsigned long flags;
+	int ccode;
+
+	spin_lock_irqsave(&diag8c_lock, flags);
+
+	diag_stat_inc(DIAG_STAT_X08C);
+	ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr));
+
+	*addr = *__diag8c_tmp_amode31;
+	spin_unlock_irqrestore(&diag8c_lock, flags);
+
+	return ccode;
+}
+EXPORT_SYMBOL(diag8c);
+
+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);