tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SCLP early driver
4 *
5 * Copyright IBM Corp. 2013
6 */
7
8#define KMSG_COMPONENT "sclp_early"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/errno.h>
12#include <linux/memblock.h>
13#include <asm/ctl_reg.h>
14#include <asm/sclp.h>
15#include <asm/ipl.h>
16#include <asm/setup.h>
17#include <asm/facility.h>
18#include "sclp_sdias.h"
19#include "sclp.h"
20
21static struct sclp_ipl_info sclp_ipl_info;
22
23struct sclp_info sclp;
24EXPORT_SYMBOL(sclp);
25
26static void __init sclp_early_facilities_detect(void)
27{
28 struct sclp_core_entry *cpue;
29 struct read_info_sccb *sccb;
30 u16 boot_cpu_address, cpu;
31
32 sccb = sclp_early_get_info();
33 if (!sccb)
34 return;
35
36 sclp.facilities = sccb->facilities;
37 sclp.has_sprp = !!(sccb->fac84 & 0x02);
38 sclp.has_core_type = !!(sccb->fac84 & 0x01);
39 sclp.has_gsls = !!(sccb->fac85 & 0x80);
40 sclp.has_64bscao = !!(sccb->fac116 & 0x80);
41 sclp.has_cmma = !!(sccb->fac116 & 0x40);
42 sclp.has_esca = !!(sccb->fac116 & 0x08);
43 sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
44 sclp.has_ibs = !!(sccb->fac117 & 0x20);
45 sclp.has_gisaf = !!(sccb->fac118 & 0x08);
46 sclp.has_hvs = !!(sccb->fac119 & 0x80);
47 sclp.has_kss = !!(sccb->fac98 & 0x01);
48 sclp.has_aisii = !!(sccb->fac118 & 0x40);
49 sclp.has_aeni = !!(sccb->fac118 & 0x20);
50 sclp.has_aisi = !!(sccb->fac118 & 0x10);
51 sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01);
52 if (sccb->fac85 & 0x02)
53 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
54 if (sccb->fac91 & 0x40)
55 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
56 if (sccb->cpuoff > 134) {
57 sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
58 sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
59 }
60 if (sccb->cpuoff > 137) {
61 sclp.has_sipl = !!(sccb->cbl & 0x4000);
62 sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000);
63 }
64 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
65 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
66 sclp.rzm <<= 20;
67 sclp.ibc = sccb->ibc;
68
69 if (sccb->hamaxpow && sccb->hamaxpow < 64)
70 sclp.hamax = (1UL << sccb->hamaxpow) - 1;
71 else
72 sclp.hamax = U64_MAX;
73
74 if (!sccb->hcpua) {
75 if (MACHINE_IS_VM)
76 sclp.max_cores = 64;
77 else
78 sclp.max_cores = sccb->ncpurl;
79 } else {
80 sclp.max_cores = sccb->hcpua + 1;
81 }
82
83 boot_cpu_address = stap();
84 cpue = (void *)sccb + sccb->cpuoff;
85 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
86 if (boot_cpu_address != cpue->core_id)
87 continue;
88 sclp.has_siif = cpue->siif;
89 sclp.has_sigpif = cpue->sigpif;
90 sclp.has_sief2 = cpue->sief2;
91 sclp.has_gpere = cpue->gpere;
92 sclp.has_ib = cpue->ib;
93 sclp.has_cei = cpue->cei;
94 sclp.has_skey = cpue->skey;
95 break;
96 }
97
98 /* Save IPL information */
99 sclp_ipl_info.is_valid = 1;
100 if (sccb->fac91 & 0x2)
101 sclp_ipl_info.has_dump = 1;
102 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
103
104 if (sccb->hsa_size)
105 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
106 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
107 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
108 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
109
110 sclp.hmfai = sccb->hmfai;
111 sclp.has_dirq = !!(sccb->cpudirq & 0x80);
112}
113
114/*
115 * This function will be called after sclp_early_facilities_detect(), which gets
116 * called from early.c code. The sclp_early_facilities_detect() function retrieves
117 * and saves the IPL information.
118 */
119void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
120{
121 *info = sclp_ipl_info;
122}
123
124int __init sclp_early_get_core_info(struct sclp_core_info *info)
125{
126 struct read_cpu_info_sccb *sccb;
127 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
128 int rc = 0;
129
130 if (!SCLP_HAS_CPU_INFO)
131 return -EOPNOTSUPP;
132
133 sccb = memblock_alloc_low(length, PAGE_SIZE);
134 if (!sccb)
135 return -ENOMEM;
136
137 memset(sccb, 0, length);
138 sccb->header.length = length;
139 sccb->header.control_mask[2] = 0x80;
140 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) {
141 rc = -EIO;
142 goto out;
143 }
144 if (sccb->header.response_code != 0x0010) {
145 rc = -EIO;
146 goto out;
147 }
148 sclp_fill_core_info(info, sccb);
149out:
150 memblock_free(sccb, length);
151 return rc;
152}
153
154static void __init sclp_early_console_detect(struct init_sccb *sccb)
155{
156 if (sccb->header.response_code != 0x20)
157 return;
158
159 if (sclp_early_con_check_vt220(sccb))
160 sclp.has_vt220 = 1;
161
162 if (sclp_early_con_check_linemode(sccb))
163 sclp.has_linemode = 1;
164}
165
166void __init __no_sanitize_address sclp_early_adjust_va(void)
167{
168 sclp_early_sccb = __va((unsigned long)sclp_early_sccb);
169}
170
171void __init sclp_early_detect(void)
172{
173 void *sccb = sclp_early_sccb;
174
175 sclp_early_facilities_detect();
176
177 /*
178 * Turn off SCLP event notifications. Also save remote masks in the
179 * sccb. These are sufficient to detect sclp console capabilities.
180 */
181 sclp_early_set_event_mask(sccb, 0, 0);
182 sclp_early_console_detect(sccb);
183}