1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
2395d31d4SMartin Schwidefsky /*
3395d31d4SMartin Schwidefsky * Copyright IBM Corp. 2008
4395d31d4SMartin Schwidefsky * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
5395d31d4SMartin Schwidefsky */
6395d31d4SMartin Schwidefsky
7395d31d4SMartin Schwidefsky #define KMSG_COMPONENT "cpu"
8395d31d4SMartin Schwidefsky #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9395d31d4SMartin Schwidefsky
104ecf0a43SHeiko Carstens #include <linux/stop_machine.h>
11157467baSHeiko Carstens #include <linux/bitops.h>
12395d31d4SMartin Schwidefsky #include <linux/kernel.h>
13f17a6d5dSHeiko Carstens #include <linux/random.h>
1468e21be2SIngo Molnar #include <linux/sched/mm.h>
15395d31d4SMartin Schwidefsky #include <linux/init.h>
16395d31d4SMartin Schwidefsky #include <linux/seq_file.h>
17589ee628SIngo Molnar #include <linux/mm_types.h>
18395d31d4SMartin Schwidefsky #include <linux/delay.h>
1919726cecSHeiko Carstens #include <linux/cpu.h>
2068e21be2SIngo Molnar
211ec2772eSMartin Schwidefsky #include <asm/diag.h>
22097a116cSHeiko Carstens #include <asm/facility.h>
23395d31d4SMartin Schwidefsky #include <asm/elf.h>
24395d31d4SMartin Schwidefsky #include <asm/lowcore.h>
25395d31d4SMartin Schwidefsky #include <asm/param.h>
26f17a6d5dSHeiko Carstens #include <asm/sclp.h>
274d92f502SHeiko Carstens #include <asm/smp.h>
28395d31d4SMartin Schwidefsky
29f17a6d5dSHeiko Carstens unsigned long __read_mostly elf_hwcap;
30f17a6d5dSHeiko Carstens char elf_platform[ELF_PLATFORM_SIZE];
31f17a6d5dSHeiko Carstens
32097a116cSHeiko Carstens struct cpu_info {
33097a116cSHeiko Carstens unsigned int cpu_mhz_dynamic;
34097a116cSHeiko Carstens unsigned int cpu_mhz_static;
35097a116cSHeiko Carstens struct cpuid cpu_id;
36097a116cSHeiko Carstens };
37097a116cSHeiko Carstens
38097a116cSHeiko Carstens static DEFINE_PER_CPU(struct cpu_info, cpu_info);
3938f2c691SMartin Schwidefsky static DEFINE_PER_CPU(int, cpu_relax_retry);
40097a116cSHeiko Carstens
41097a116cSHeiko Carstens static bool machine_has_cpu_mhz;
42097a116cSHeiko Carstens
cpu_detect_mhz_feature(void)43097a116cSHeiko Carstens void __init cpu_detect_mhz_feature(void)
44097a116cSHeiko Carstens {
45097a116cSHeiko Carstens if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL)
46970ba6acSHeiko Carstens machine_has_cpu_mhz = true;
47097a116cSHeiko Carstens }
48097a116cSHeiko Carstens
update_cpu_mhz(void * arg)49097a116cSHeiko Carstens static void update_cpu_mhz(void *arg)
50097a116cSHeiko Carstens {
51097a116cSHeiko Carstens unsigned long mhz;
52097a116cSHeiko Carstens struct cpu_info *c;
53097a116cSHeiko Carstens
54097a116cSHeiko Carstens mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0);
55097a116cSHeiko Carstens c = this_cpu_ptr(&cpu_info);
56097a116cSHeiko Carstens c->cpu_mhz_dynamic = mhz >> 32;
57097a116cSHeiko Carstens c->cpu_mhz_static = mhz & 0xffffffff;
58097a116cSHeiko Carstens }
59097a116cSHeiko Carstens
s390_update_cpu_mhz(void)60097a116cSHeiko Carstens void s390_update_cpu_mhz(void)
61097a116cSHeiko Carstens {
62097a116cSHeiko Carstens s390_adjust_jiffies();
63097a116cSHeiko Carstens if (machine_has_cpu_mhz)
64097a116cSHeiko Carstens on_each_cpu(update_cpu_mhz, NULL, 0);
65097a116cSHeiko Carstens }
6694038a99SMartin Schwidefsky
stop_machine_yield(const struct cpumask * cpumask)674ecf0a43SHeiko Carstens void notrace stop_machine_yield(const struct cpumask *cpumask)
684d92f502SHeiko Carstens {
6938f2c691SMartin Schwidefsky int cpu, this_cpu;
7038f2c691SMartin Schwidefsky
7138f2c691SMartin Schwidefsky this_cpu = smp_processor_id();
7238f2c691SMartin Schwidefsky if (__this_cpu_inc_return(cpu_relax_retry) >= spin_retry) {
7338f2c691SMartin Schwidefsky __this_cpu_write(cpu_relax_retry, 0);
7438f2c691SMartin Schwidefsky cpu = cpumask_next_wrap(this_cpu, cpumask, this_cpu, false);
7538f2c691SMartin Schwidefsky if (cpu >= nr_cpu_ids)
7638f2c691SMartin Schwidefsky return;
7738f2c691SMartin Schwidefsky if (arch_vcpu_is_preempted(cpu))
7838f2c691SMartin Schwidefsky smp_yield_cpu(cpu);
791ec2772eSMartin Schwidefsky }
804d92f502SHeiko Carstens }
814d92f502SHeiko Carstens
8294038a99SMartin Schwidefsky /*
8394038a99SMartin Schwidefsky * cpu_init - initializes state that is per-CPU.
8494038a99SMartin Schwidefsky */
cpu_init(void)85e2741f17SPaul Gortmaker void cpu_init(void)
8694038a99SMartin Schwidefsky {
87097a116cSHeiko Carstens struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
8894038a99SMartin Schwidefsky
8994038a99SMartin Schwidefsky get_cpu_id(id);
90097a116cSHeiko Carstens if (machine_has_cpu_mhz)
91097a116cSHeiko Carstens update_cpu_mhz(NULL);
92f1f10076SVegard Nossum mmgrab(&init_mm);
9394038a99SMartin Schwidefsky current->active_mm = &init_mm;
9494038a99SMartin Schwidefsky BUG_ON(current->mm);
9594038a99SMartin Schwidefsky enter_lazy_tlb(&init_mm, current);
9694038a99SMartin Schwidefsky }
9794038a99SMartin Schwidefsky
show_facilities(struct seq_file * m)98157467baSHeiko Carstens static void show_facilities(struct seq_file *m)
99157467baSHeiko Carstens {
100157467baSHeiko Carstens unsigned int bit;
101157467baSHeiko Carstens
102157467baSHeiko Carstens seq_puts(m, "facilities :");
10317e89e13SSven Schnelle for_each_set_bit_inv(bit, (long *)&stfle_fac_list, MAX_FACILITY_BIT)
104157467baSHeiko Carstens seq_printf(m, " %d", bit);
105157467baSHeiko Carstens seq_putc(m, '\n');
106157467baSHeiko Carstens }
107157467baSHeiko Carstens
show_cpu_summary(struct seq_file * m,void * v)108219a21b3SHeiko Carstens static void show_cpu_summary(struct seq_file *m, void *v)
109395d31d4SMartin Schwidefsky {
110fbf3c542SHeiko Carstens static const char *hwcap_str[] = {
11195655495SHeiko Carstens [HWCAP_NR_ESAN3] = "esan3",
11295655495SHeiko Carstens [HWCAP_NR_ZARCH] = "zarch",
11395655495SHeiko Carstens [HWCAP_NR_STFLE] = "stfle",
11495655495SHeiko Carstens [HWCAP_NR_MSA] = "msa",
11595655495SHeiko Carstens [HWCAP_NR_LDISP] = "ldisp",
11695655495SHeiko Carstens [HWCAP_NR_EIMM] = "eimm",
11795655495SHeiko Carstens [HWCAP_NR_DFP] = "dfp",
11895655495SHeiko Carstens [HWCAP_NR_HPAGE] = "edat",
11995655495SHeiko Carstens [HWCAP_NR_ETF3EH] = "etf3eh",
12095655495SHeiko Carstens [HWCAP_NR_HIGH_GPRS] = "highgprs",
12195655495SHeiko Carstens [HWCAP_NR_TE] = "te",
12295655495SHeiko Carstens [HWCAP_NR_VXRS] = "vx",
12395655495SHeiko Carstens [HWCAP_NR_VXRS_BCD] = "vxd",
12495655495SHeiko Carstens [HWCAP_NR_VXRS_EXT] = "vxe",
12595655495SHeiko Carstens [HWCAP_NR_GS] = "gs",
12695655495SHeiko Carstens [HWCAP_NR_VXRS_EXT2] = "vxe2",
12795655495SHeiko Carstens [HWCAP_NR_VXRS_PDE] = "vxp",
12895655495SHeiko Carstens [HWCAP_NR_SORT] = "sort",
12995655495SHeiko Carstens [HWCAP_NR_DFLT] = "dflt",
13095655495SHeiko Carstens [HWCAP_NR_VXRS_PDE2] = "vxp2",
13195655495SHeiko Carstens [HWCAP_NR_NNPA] = "nnpa",
13295655495SHeiko Carstens [HWCAP_NR_PCI_MIO] = "pcimio",
1337e82523fSHeiko Carstens [HWCAP_NR_SIE] = "sie",
1347f16d7e7SDavid Hildenbrand };
135219a21b3SHeiko Carstens int i, cpu;
136395d31d4SMartin Schwidefsky
137c68d4632SHeiko Carstens BUILD_BUG_ON(ARRAY_SIZE(hwcap_str) != HWCAP_NR_MAX);
138395d31d4SMartin Schwidefsky seq_printf(m, "vendor_id : IBM/S390\n"
139395d31d4SMartin Schwidefsky "# processors : %i\n"
140395d31d4SMartin Schwidefsky "bogomips per cpu: %lu.%02lu\n",
141395d31d4SMartin Schwidefsky num_online_cpus(), loops_per_jiffy/(500000/HZ),
142395d31d4SMartin Schwidefsky (loops_per_jiffy/(5000/HZ))%100);
14310f4954aSHeiko Carstens seq_printf(m, "max thread id : %d\n", smp_cpu_mtid);
144395d31d4SMartin Schwidefsky seq_puts(m, "features\t: ");
145fbf3c542SHeiko Carstens for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
146395d31d4SMartin Schwidefsky if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
147395d31d4SMartin Schwidefsky seq_printf(m, "%s ", hwcap_str[i]);
148395d31d4SMartin Schwidefsky seq_puts(m, "\n");
149157467baSHeiko Carstens show_facilities(m);
1506668022cSHeiko Carstens show_cacheinfo(m);
151219a21b3SHeiko Carstens for_each_online_cpu(cpu) {
152097a116cSHeiko Carstens struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
153219a21b3SHeiko Carstens
154219a21b3SHeiko Carstens seq_printf(m, "processor %d: "
155395d31d4SMartin Schwidefsky "version = %02X, "
156395d31d4SMartin Schwidefsky "identification = %06X, "
157395d31d4SMartin Schwidefsky "machine = %04X\n",
158219a21b3SHeiko Carstens cpu, id->version, id->ident, id->machine);
159395d31d4SMartin Schwidefsky }
160219a21b3SHeiko Carstens }
161219a21b3SHeiko Carstens
setup_hwcaps(void)162f17a6d5dSHeiko Carstens static int __init setup_hwcaps(void)
163f17a6d5dSHeiko Carstens {
164251527c9SHeiko Carstens /* instructions named N3, "backported" to esa-mode */
165251527c9SHeiko Carstens elf_hwcap |= HWCAP_ESAN3;
166251527c9SHeiko Carstens
167251527c9SHeiko Carstens /* z/Architecture mode active */
168251527c9SHeiko Carstens elf_hwcap |= HWCAP_ZARCH;
169251527c9SHeiko Carstens
170251527c9SHeiko Carstens /* store-facility-list-extended */
171251527c9SHeiko Carstens if (test_facility(7))
172251527c9SHeiko Carstens elf_hwcap |= HWCAP_STFLE;
173251527c9SHeiko Carstens
174251527c9SHeiko Carstens /* message-security assist */
175251527c9SHeiko Carstens if (test_facility(17))
176251527c9SHeiko Carstens elf_hwcap |= HWCAP_MSA;
177251527c9SHeiko Carstens
178251527c9SHeiko Carstens /* long-displacement */
179251527c9SHeiko Carstens if (test_facility(19))
180251527c9SHeiko Carstens elf_hwcap |= HWCAP_LDISP;
181251527c9SHeiko Carstens
182251527c9SHeiko Carstens /* extended-immediate */
183251527c9SHeiko Carstens elf_hwcap |= HWCAP_EIMM;
184f17a6d5dSHeiko Carstens
185449fbd71SHeiko Carstens /* extended-translation facility 3 enhancement */
186f17a6d5dSHeiko Carstens if (test_facility(22) && test_facility(30))
187f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_ETF3EH;
188f17a6d5dSHeiko Carstens
189449fbd71SHeiko Carstens /* decimal floating point & perform floating point operation */
19098ac9169SHeiko Carstens if (test_facility(42) && test_facility(44))
191f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_DFP;
192f17a6d5dSHeiko Carstens
193449fbd71SHeiko Carstens /* huge page support */
194f17a6d5dSHeiko Carstens if (MACHINE_HAS_EDAT1)
195f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_HPAGE;
196f17a6d5dSHeiko Carstens
197449fbd71SHeiko Carstens /* 64-bit register support for 31-bit processes */
198f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_HIGH_GPRS;
199f17a6d5dSHeiko Carstens
200449fbd71SHeiko Carstens /* transactional execution */
201f17a6d5dSHeiko Carstens if (MACHINE_HAS_TE)
202f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_TE;
203f17a6d5dSHeiko Carstens
204f17a6d5dSHeiko Carstens /*
205449fbd71SHeiko Carstens * Vector extension can be disabled with the "novx" parameter.
206449fbd71SHeiko Carstens * Use MACHINE_HAS_VX instead of facility bit 129.
207f17a6d5dSHeiko Carstens */
208f17a6d5dSHeiko Carstens if (MACHINE_HAS_VX) {
209f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_VXRS;
210f17a6d5dSHeiko Carstens if (test_facility(134))
211f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_VXRS_BCD;
212f17a6d5dSHeiko Carstens if (test_facility(135))
213f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_VXRS_EXT;
214f17a6d5dSHeiko Carstens if (test_facility(148))
215f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_VXRS_EXT2;
216f17a6d5dSHeiko Carstens if (test_facility(152))
217f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_VXRS_PDE;
218f17a6d5dSHeiko Carstens if (test_facility(192))
219f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_VXRS_PDE2;
220f17a6d5dSHeiko Carstens }
221449fbd71SHeiko Carstens
222f17a6d5dSHeiko Carstens if (test_facility(150))
223f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_SORT;
224449fbd71SHeiko Carstens
225f17a6d5dSHeiko Carstens if (test_facility(151))
226f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_DFLT;
227449fbd71SHeiko Carstens
228f17a6d5dSHeiko Carstens if (test_facility(165))
229f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_NNPA;
230f17a6d5dSHeiko Carstens
231449fbd71SHeiko Carstens /* guarded storage */
232f17a6d5dSHeiko Carstens if (MACHINE_HAS_GS)
233f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_GS;
234449fbd71SHeiko Carstens
235f17a6d5dSHeiko Carstens if (MACHINE_HAS_PCI_MIO)
236f17a6d5dSHeiko Carstens elf_hwcap |= HWCAP_PCI_MIO;
237f17a6d5dSHeiko Carstens
238449fbd71SHeiko Carstens /* virtualization support */
239873129caSHeiko Carstens if (sclp.has_sief2)
2407e82523fSHeiko Carstens elf_hwcap |= HWCAP_SIE;
241873129caSHeiko Carstens
242873129caSHeiko Carstens return 0;
243873129caSHeiko Carstens }
244873129caSHeiko Carstens arch_initcall(setup_hwcaps);
245873129caSHeiko Carstens
setup_elf_platform(void)246873129caSHeiko Carstens static int __init setup_elf_platform(void)
247873129caSHeiko Carstens {
248873129caSHeiko Carstens struct cpuid cpu_id;
249873129caSHeiko Carstens
250f17a6d5dSHeiko Carstens get_cpu_id(&cpu_id);
251f17a6d5dSHeiko Carstens add_device_randomness(&cpu_id, sizeof(cpu_id));
252f17a6d5dSHeiko Carstens switch (cpu_id.machine) {
2534efd417fSVasily Gorbik default: /* Use "z10" as default. */
254f17a6d5dSHeiko Carstens strcpy(elf_platform, "z10");
255f17a6d5dSHeiko Carstens break;
256f17a6d5dSHeiko Carstens case 0x2817:
257f17a6d5dSHeiko Carstens case 0x2818:
258f17a6d5dSHeiko Carstens strcpy(elf_platform, "z196");
259f17a6d5dSHeiko Carstens break;
260f17a6d5dSHeiko Carstens case 0x2827:
261f17a6d5dSHeiko Carstens case 0x2828:
262f17a6d5dSHeiko Carstens strcpy(elf_platform, "zEC12");
263f17a6d5dSHeiko Carstens break;
264f17a6d5dSHeiko Carstens case 0x2964:
265f17a6d5dSHeiko Carstens case 0x2965:
266f17a6d5dSHeiko Carstens strcpy(elf_platform, "z13");
267f17a6d5dSHeiko Carstens break;
268f17a6d5dSHeiko Carstens case 0x3906:
269f17a6d5dSHeiko Carstens case 0x3907:
270f17a6d5dSHeiko Carstens strcpy(elf_platform, "z14");
271f17a6d5dSHeiko Carstens break;
272f17a6d5dSHeiko Carstens case 0x8561:
273f17a6d5dSHeiko Carstens case 0x8562:
274f17a6d5dSHeiko Carstens strcpy(elf_platform, "z15");
275f17a6d5dSHeiko Carstens break;
276*6203ac30SHeiko Carstens case 0x3931:
277*6203ac30SHeiko Carstens case 0x3932:
278*6203ac30SHeiko Carstens strcpy(elf_platform, "z16");
279*6203ac30SHeiko Carstens break;
280f17a6d5dSHeiko Carstens }
281f17a6d5dSHeiko Carstens return 0;
282f17a6d5dSHeiko Carstens }
283873129caSHeiko Carstens arch_initcall(setup_elf_platform);
284f17a6d5dSHeiko Carstens
show_cpu_topology(struct seq_file * m,unsigned long n)285fb835102SAlexander Gordeev static void show_cpu_topology(struct seq_file *m, unsigned long n)
286fb835102SAlexander Gordeev {
287fb835102SAlexander Gordeev #ifdef CONFIG_SCHED_TOPOLOGY
288fb835102SAlexander Gordeev seq_printf(m, "physical id : %d\n", topology_physical_package_id(n));
289fb835102SAlexander Gordeev seq_printf(m, "core id : %d\n", topology_core_id(n));
290fb835102SAlexander Gordeev seq_printf(m, "book id : %d\n", topology_book_id(n));
291fb835102SAlexander Gordeev seq_printf(m, "drawer id : %d\n", topology_drawer_id(n));
292fb835102SAlexander Gordeev seq_printf(m, "dedicated : %d\n", topology_cpu_dedicated(n));
29342d211a1SAlexander Gordeev seq_printf(m, "address : %d\n", smp_cpu_get_cpu_address(n));
2942db52dc3SAlexander Gordeev seq_printf(m, "siblings : %d\n", cpumask_weight(topology_core_cpumask(n)));
29595968497SAlexander Gordeev seq_printf(m, "cpu cores : %d\n", topology_booted_cores(n));
296fb835102SAlexander Gordeev #endif /* CONFIG_SCHED_TOPOLOGY */
297fb835102SAlexander Gordeev }
298fb835102SAlexander Gordeev
show_cpu_ids(struct seq_file * m,unsigned long n)299fb835102SAlexander Gordeev static void show_cpu_ids(struct seq_file *m, unsigned long n)
300fb835102SAlexander Gordeev {
301fb835102SAlexander Gordeev struct cpuid *id = &per_cpu(cpu_info.cpu_id, n);
302fb835102SAlexander Gordeev
303fb835102SAlexander Gordeev seq_printf(m, "version : %02X\n", id->version);
304fb835102SAlexander Gordeev seq_printf(m, "identification : %06X\n", id->ident);
305fb835102SAlexander Gordeev seq_printf(m, "machine : %04X\n", id->machine);
306fb835102SAlexander Gordeev }
307fb835102SAlexander Gordeev
show_cpu_mhz(struct seq_file * m,unsigned long n)308097a116cSHeiko Carstens static void show_cpu_mhz(struct seq_file *m, unsigned long n)
309097a116cSHeiko Carstens {
310097a116cSHeiko Carstens struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
311097a116cSHeiko Carstens
3121b648dfdSAlexander Gordeev if (!machine_has_cpu_mhz)
3131b648dfdSAlexander Gordeev return;
314097a116cSHeiko Carstens seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
315097a116cSHeiko Carstens seq_printf(m, "cpu MHz static : %d\n", c->cpu_mhz_static);
316097a116cSHeiko Carstens }
317097a116cSHeiko Carstens
318219a21b3SHeiko Carstens /*
319219a21b3SHeiko Carstens * show_cpuinfo - Get information on one CPU for use by procfs.
320219a21b3SHeiko Carstens */
show_cpuinfo(struct seq_file * m,void * v)321219a21b3SHeiko Carstens static int show_cpuinfo(struct seq_file *m, void *v)
322219a21b3SHeiko Carstens {
323219a21b3SHeiko Carstens unsigned long n = (unsigned long) v - 1;
324872f2710SAlexander Gordeev unsigned long first = cpumask_first(cpu_online_mask);
325219a21b3SHeiko Carstens
326872f2710SAlexander Gordeev if (n == first)
327219a21b3SHeiko Carstens show_cpu_summary(m, v);
328109ab954SHeiko Carstens seq_printf(m, "\ncpu number : %ld\n", n);
329fb835102SAlexander Gordeev show_cpu_topology(m, n);
330fb835102SAlexander Gordeev show_cpu_ids(m, n);
331097a116cSHeiko Carstens show_cpu_mhz(m, n);
332395d31d4SMartin Schwidefsky return 0;
333395d31d4SMartin Schwidefsky }
334395d31d4SMartin Schwidefsky
c_update(loff_t * pos)335281eaa8cSHeiko Carstens static inline void *c_update(loff_t *pos)
336281eaa8cSHeiko Carstens {
337281eaa8cSHeiko Carstens if (*pos)
338281eaa8cSHeiko Carstens *pos = cpumask_next(*pos - 1, cpu_online_mask);
339872f2710SAlexander Gordeev else
340872f2710SAlexander Gordeev *pos = cpumask_first(cpu_online_mask);
341281eaa8cSHeiko Carstens return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
342281eaa8cSHeiko Carstens }
343281eaa8cSHeiko Carstens
c_start(struct seq_file * m,loff_t * pos)344395d31d4SMartin Schwidefsky static void *c_start(struct seq_file *m, loff_t *pos)
345395d31d4SMartin Schwidefsky {
346a73de293SSebastian Andrzej Siewior cpus_read_lock();
347281eaa8cSHeiko Carstens return c_update(pos);
348395d31d4SMartin Schwidefsky }
349395d31d4SMartin Schwidefsky
c_next(struct seq_file * m,void * v,loff_t * pos)350395d31d4SMartin Schwidefsky static void *c_next(struct seq_file *m, void *v, loff_t *pos)
351395d31d4SMartin Schwidefsky {
352395d31d4SMartin Schwidefsky ++*pos;
353281eaa8cSHeiko Carstens return c_update(pos);
354395d31d4SMartin Schwidefsky }
355395d31d4SMartin Schwidefsky
c_stop(struct seq_file * m,void * v)356395d31d4SMartin Schwidefsky static void c_stop(struct seq_file *m, void *v)
357395d31d4SMartin Schwidefsky {
358a73de293SSebastian Andrzej Siewior cpus_read_unlock();
359395d31d4SMartin Schwidefsky }
360395d31d4SMartin Schwidefsky
361395d31d4SMartin Schwidefsky const struct seq_operations cpuinfo_op = {
362395d31d4SMartin Schwidefsky .start = c_start,
363395d31d4SMartin Schwidefsky .next = c_next,
364395d31d4SMartin Schwidefsky .stop = c_stop,
365395d31d4SMartin Schwidefsky .show = show_cpuinfo,
366395d31d4SMartin Schwidefsky };
367