diag.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Implementation of s390 diagnose codes
  4 *
  5 * Copyright IBM Corp. 2007
  6 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
  7 */
  8
  9#include <linux/export.h>
 10#include <linux/init.h>
 11#include <linux/cpu.h>
 12#include <linux/seq_file.h>
 13#include <linux/debugfs.h>
 14#include <linux/vmalloc.h>
 15#include <asm/asm-extable.h>
 16#include <asm/diag.h>
 17#include <asm/trace/diag.h>
 18#include <asm/sections.h>
 19#include <asm/asm.h>
 20#include "../entry.h"
 21
 22struct diag_stat {
 23	unsigned int counter[NR_DIAG_STAT];
 24};
 25
 26static DEFINE_PER_CPU(struct diag_stat, diag_stat);
 27
 28struct diag_desc {
 29	int code;
 30	char *name;
 31};
 32
 33static const struct diag_desc diag_map[NR_DIAG_STAT] = {
 34	[DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
 35	[DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
 36	[DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
 37	[DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
 38	[DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
 39	[DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
 40	[DIAG_STAT_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" },
 41	[DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
 42	[DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
 43	[DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
 44	[DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
 45	[DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
 46	[DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
 47	[DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
 48	[DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
 49	[DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
 50	[DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
 51	[DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
 52	[DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
 53	[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
 54	[DIAG_STAT_X310] = { .code = 0x310, .name = "Memory Topology Information" },
 55	[DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
 56	[DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" },
 57	[DIAG_STAT_X324] = { .code = 0x324, .name = "Power Information Block" },
 58	[DIAG_STAT_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" },
 59	[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
 60};
 61
 62struct diag_ops __amode31_ref diag_amode31_ops = {
 63	.diag210 = _diag210_amode31,
 64	.diag26c = _diag26c_amode31,
 65	.diag14 = _diag14_amode31,
 66	.diag0c = _diag0c_amode31,
 67	.diag8c = _diag8c_amode31,
 68	.diag308_reset = _diag308_reset_amode31
 69};
 70
 71static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
 72struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
 73
 74static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data");
 75static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31;
 76
 77static int show_diag_stat(struct seq_file *m, void *v)
 78{
 79	struct diag_stat *stat;
 80	unsigned long n = (unsigned long) v - 1;
 81	int cpu, prec, tmp;
 82
 83	cpus_read_lock();
 84	if (n == 0) {
 85		seq_puts(m, "         ");
 86
 87		for_each_online_cpu(cpu) {
 88			prec = 10;
 89			for (tmp = 10; cpu >= tmp; tmp *= 10)
 90				prec--;
 91			seq_printf(m, "%*s%d", prec, "CPU", cpu);
 92		}
 93		seq_putc(m, '\n');
 94	} else if (n <= NR_DIAG_STAT) {
 95		seq_printf(m, "diag %03x:", diag_map[n-1].code);
 96		for_each_online_cpu(cpu) {
 97			stat = &per_cpu(diag_stat, cpu);
 98			seq_printf(m, " %10u", stat->counter[n-1]);
 99		}
100		seq_printf(m, "    %s\n", diag_map[n-1].name);
101	}
102	cpus_read_unlock();
103	return 0;
104}
105
106static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
107{
108	return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
109}
110
111static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
112{
113	++*pos;
114	return show_diag_stat_start(m, pos);
115}
116
117static void show_diag_stat_stop(struct seq_file *m, void *v)
118{
119}
120
121static const struct seq_operations show_diag_stat_sops = {
122	.start	= show_diag_stat_start,
123	.next	= show_diag_stat_next,
124	.stop	= show_diag_stat_stop,
125	.show	= show_diag_stat,
126};
127
128DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
129
130static int __init show_diag_stat_init(void)
131{
132	debugfs_create_file("diag_stat", 0400, NULL, NULL,
133			    &show_diag_stat_fops);
134	return 0;
135}
136
137device_initcall(show_diag_stat_init);
138
139void diag_stat_inc(enum diag_stat_enum nr)
140{
141	this_cpu_inc(diag_stat.counter[nr]);
142	trace_s390_diagnose(diag_map[nr].code);
143}
144EXPORT_SYMBOL(diag_stat_inc);
145
146void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
147{
148	this_cpu_inc(diag_stat.counter[nr]);
149	trace_s390_diagnose_norecursion(diag_map[nr].code);
150}
151EXPORT_SYMBOL(diag_stat_inc_norecursion);
152
153/*
154 * Diagnose 0c: Pseudo Timer
155 */
156void diag0c(struct hypfs_diag0c_entry *data)
157{
158	diag_stat_inc(DIAG_STAT_X00C);
159	diag_amode31_ops.diag0c(virt_to_phys(data));
160}
161
162/*
163 * Diagnose 14: Input spool file manipulation
164 *
165 * The subcode parameter determines the type of the first parameter rx.
166 * Currently used are the following 3 subcommands:
167 * 0x0:   Read the Next Spool File Buffer (Data Record)
168 * 0x28:  Position a Spool File to the Designated Record
169 * 0xfff: Retrieve Next File Descriptor
170 *
171 * For subcommands 0x0 and 0xfff, the value of the first parameter is
172 * a virtual address of a memory buffer and needs virtual to physical
173 * address translation. For other subcommands the rx parameter is not
174 * a virtual address.
175 */
176int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
177{
178	diag_stat_inc(DIAG_STAT_X014);
179	switch (subcode) {
180	case 0x0:
181	case 0xfff:
182		rx = virt_to_phys((void *)rx);
183		break;
184	default:
185		/* Do nothing */
186		break;
187	}
188	return diag_amode31_ops.diag14(rx, ry1, subcode);
189}
190EXPORT_SYMBOL(diag14);
191
192#define DIAG204_BUSY_RC 8
193
194static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
195{
196	union register_pair rp = { .even = *subcode, .odd = size };
197
198	asm_inline volatile(
199		"	diag	%[addr],%[rp],0x204\n"
200		"0:	nopr	%%r7\n"
201		EX_TABLE(0b,0b)
202		: [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
203	*subcode = rp.even;
204	return rp.odd;
205}
206
207/**
208 * diag204() - Issue diagnose 204 call.
209 * @subcode: Subcode of diagnose 204 to be executed.
210 * @size: Size of area in pages which @area points to, if given.
211 * @addr: Vmalloc'ed memory area where the result is written to.
212 *
213 * Execute diagnose 204 with the given subcode and write the result to the
214 * memory area specified with @addr. For subcodes which do not write a
215 * result to memory both @size and @addr must be zero. If @addr is
216 * specified it must be page aligned and must have been allocated with
217 * vmalloc(). Conversion to real / physical addresses will be handled by
218 * this function if required.
219 */
220int diag204(unsigned long subcode, unsigned long size, void *addr)
221{
222	if (addr) {
223		if (WARN_ON_ONCE(!is_vmalloc_addr(addr)))
224			return -EINVAL;
225		if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE)))
226			return -EINVAL;
227	}
228	if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4)
229		addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr));
230	diag_stat_inc(DIAG_STAT_X204);
231	size = __diag204(&subcode, size, addr);
232	if (subcode == DIAG204_BUSY_RC)
233		return -EBUSY;
234	else if (subcode)
235		return -EOPNOTSUPP;
236	return size;
237}
238EXPORT_SYMBOL(diag204);
239
240/*
241 * Diagnose 210: Get information about a virtual device
242 */
243int diag210(struct diag210 *addr)
244{
245	static DEFINE_SPINLOCK(diag210_lock);
246	unsigned long flags;
247	int ccode;
248
249	spin_lock_irqsave(&diag210_lock, flags);
250	*__diag210_tmp_amode31 = *addr;
251
252	diag_stat_inc(DIAG_STAT_X210);
253	ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
254
255	*addr = *__diag210_tmp_amode31;
256	spin_unlock_irqrestore(&diag210_lock, flags);
257
258	return ccode;
259}
260EXPORT_SYMBOL(diag210);
261
262/*
263 * Diagnose 8C: Access 3270 Display Device Information
264 */
265int diag8c(struct diag8c *addr, struct ccw_dev_id *devno)
266{
267	static DEFINE_SPINLOCK(diag8c_lock);
268	unsigned long flags;
269	int ccode;
270
271	spin_lock_irqsave(&diag8c_lock, flags);
272
273	diag_stat_inc(DIAG_STAT_X08C);
274	ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr));
275
276	*addr = *__diag8c_tmp_amode31;
277	spin_unlock_irqrestore(&diag8c_lock, flags);
278
279	return ccode;
280}
281EXPORT_SYMBOL(diag8c);
282
283int diag224(void *ptr)
284{
285	unsigned long addr = __pa(ptr);
286	int rc = -EOPNOTSUPP;
287
288	diag_stat_inc(DIAG_STAT_X224);
289	asm_inline volatile("\n"
290		"	diag	%[type],%[addr],0x224\n"
291		"0:	lhi	%[rc],0\n"
292		"1:\n"
293		EX_TABLE(0b,1b)
294		: [rc] "+d" (rc)
295		, "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr)
296		: [type] "d" (0), [addr] "d" (addr));
297	return rc;
298}
299EXPORT_SYMBOL(diag224);
300
301/*
302 * Diagnose 26C: Access Certain System Information
303 */
304int diag26c(void *req, void *resp, enum diag26c_sc subcode)
305{
306	diag_stat_inc(DIAG_STAT_X26C);
307	return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode);
308}
309EXPORT_SYMBOL(diag26c);
310
311int diag49c(unsigned long subcode)
312{
313	int cc;
314
315	diag_stat_inc(DIAG_STAT_X49C);
316	asm volatile(
317		"	diag	%[subcode],0,0x49c\n"
318		CC_IPM(cc)
319		: CC_OUT(cc, cc)
320		: [subcode] "d" (subcode)
321		: CC_CLOBBER);
322	return CC_TRANSFORM(cc);
323}
324EXPORT_SYMBOL(diag49c);