arch/s390/kernel/diag.c - linux - Git at Google

 // 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 <asm/asm.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_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" },
 	[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 0c: Pseudo Timer
  */
 void diag0c(struct hypfs_diag0c_entry *data)
 {
 	diag_stat_inc(DIAG_STAT_X00C);
 	diag_amode31_ops.diag0c(virt_to_phys(data));
 }

 /*
  * Diagnose 14: Input spool file manipulation
  *
  * The subcode parameter determines the type of the first parameter rx.
  * Currently used are the following 3 subcommands:
  * 0x0:   Read the Next Spool File Buffer (Data Record)
  * 0x28:  Position a Spool File to the Designated Record
  * 0xfff: Retrieve Next File Descriptor
  *
  * For subcommands 0x0 and 0xfff, the value of the first parameter is
  * a virtual address of a memory buffer and needs virtual to physical
  * address translation. For other subcommands the rx parameter is not
  * a virtual address.
  */
 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 {
 	diag_stat_inc(DIAG_STAT_X014);
 	switch (subcode) {
 	case 0x0:
 	case 0xfff:
 		rx = virt_to_phys((void *)rx);
 		break;
 	default:
 		/* Do nothing */
 		break;
 	}
 	return diag_amode31_ops.diag14(rx, ry1, subcode);
 }
 EXPORT_SYMBOL(diag14);

 #define DIAG204_BUSY_RC 8

 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 -EINVAL;
 		if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE)))
 			return -EINVAL;
 	}
 	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 == DIAG204_BUSY_RC)
 		return -EBUSY;
 	else if (subcode)
 		return -EOPNOTSUPP;
 	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)
 {
 	unsigned long addr = __pa(ptr);
 	int rc = -EOPNOTSUPP;

 	diag_stat_inc(DIAG_STAT_X224);
 	asm volatile("\n"
 		"	diag	%[type],%[addr],0x224\n"
 		"0:	lhi	%[rc],0\n"
 		"1:\n"
 		EX_TABLE(0b,1b)
 		: [rc] "+d" (rc)
 		, "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr)
 		: [type] "d" (0), [addr] "d" (addr));
 	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(virt_to_phys(req), virt_to_phys(resp), subcode);
 }
 EXPORT_SYMBOL(diag26c);

 int diag49c(unsigned long subcode)
 {
 	int cc;

 	diag_stat_inc(DIAG_STAT_X49C);
 	asm volatile(
 		"	diag	%[subcode],0,0x49c\n"
 		CC_IPM(cc)
 		: CC_OUT(cc, cc)
 		: [subcode] "d" (subcode)
 		: CC_CLOBBER);
 	return CC_TRANSFORM(cc);
 }
 EXPORT_SYMBOL(diag49c);
	// 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 <asm/asm.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_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" },
	[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 0c: Pseudo Timer
	*/
	void diag0c(struct hypfs_diag0c_entry *data)
	{
	diag_stat_inc(DIAG_STAT_X00C);
	diag_amode31_ops.diag0c(virt_to_phys(data));
	}

	/*
	* Diagnose 14: Input spool file manipulation
	*
	* The subcode parameter determines the type of the first parameter rx.
	* Currently used are the following 3 subcommands:
	* 0x0: Read the Next Spool File Buffer (Data Record)
	* 0x28: Position a Spool File to the Designated Record
	* 0xfff: Retrieve Next File Descriptor
	*
	* For subcommands 0x0 and 0xfff, the value of the first parameter is
	* a virtual address of a memory buffer and needs virtual to physical
	* address translation. For other subcommands the rx parameter is not
	* a virtual address.
	*/
	int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
	{
	diag_stat_inc(DIAG_STAT_X014);
	switch (subcode) {
	case 0x0:
	case 0xfff:
	rx = virt_to_phys((void *)rx);
	break;
	default:
	/* Do nothing */
	break;
	}
	return diag_amode31_ops.diag14(rx, ry1, subcode);
	}
	EXPORT_SYMBOL(diag14);

	#define DIAG204_BUSY_RC 8

	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 -EINVAL;
	if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE)))
	return -EINVAL;
	}
	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 == DIAG204_BUSY_RC)
	return -EBUSY;
	else if (subcode)
	return -EOPNOTSUPP;
	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)
	{
	unsigned long addr = __pa(ptr);
	int rc = -EOPNOTSUPP;

	diag_stat_inc(DIAG_STAT_X224);
	asm volatile("\n"
	" diag %[type],%[addr],0x224\n"
	"0: lhi %[rc],0\n"
	"1:\n"
	EX_TABLE(0b,1b)
	: [rc] "+d" (rc)
	, "=m" ((struct { char buf[PAGE_SIZE]; } )ptr)
	: [type] "d" (0), [addr] "d" (addr));
	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(virt_to_phys(req), virt_to_phys(resp), subcode);
	}
	EXPORT_SYMBOL(diag26c);

	int diag49c(unsigned long subcode)
	{
	int cc;

	diag_stat_inc(DIAG_STAT_X49C);
	asm volatile(
	" diag %[subcode],0,0x49c\n"
	CC_IPM(cc)
	: CC_OUT(cc, cc)
	: [subcode] "d" (subcode)
	: CC_CLOBBER);
	return CC_TRANSFORM(cc);
	}
	EXPORT_SYMBOL(diag49c);