1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * pSeries firmware setup code.
4 *
5 * Portions from arch/powerpc/platforms/pseries/setup.c:
6 * Copyright (C) 1995 Linus Torvalds
7 * Adapted from 'alpha' version by Gary Thomas
8 * Modified by Cort Dougan (cort@cs.nmt.edu)
9 * Modified by PPC64 Team, IBM Corp
10 *
11 * Portions from arch/powerpc/kernel/firmware.c
12 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
13 * Modifications for ppc64:
14 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
15 * Copyright (C) 2005 Stephen Rothwell, IBM Corporation
16 *
17 * Copyright 2006 IBM Corporation.
18 */
19
20
21 #include <linux/of_fdt.h>
22 #include <asm/firmware.h>
23 #include <asm/prom.h>
24 #include <asm/udbg.h>
25 #include <asm/svm.h>
26
27 #include "pseries.h"
28
29 struct hypertas_fw_feature {
30 unsigned long val;
31 char * name;
32 };
33
34 /*
35 * The names in this table match names in rtas/ibm,hypertas-functions. If the
36 * entry ends in a '*', only upto the '*' is matched. Otherwise the entire
37 * string must match.
38 */
39 static __initdata struct hypertas_fw_feature
40 hypertas_fw_features_table[] = {
41 {FW_FEATURE_PFT, "hcall-pft"},
42 {FW_FEATURE_TCE, "hcall-tce"},
43 {FW_FEATURE_SPRG0, "hcall-sprg0"},
44 {FW_FEATURE_DABR, "hcall-dabr"},
45 {FW_FEATURE_COPY, "hcall-copy"},
46 {FW_FEATURE_ASR, "hcall-asr"},
47 {FW_FEATURE_DEBUG, "hcall-debug"},
48 {FW_FEATURE_PERF, "hcall-perf"},
49 {FW_FEATURE_DUMP, "hcall-dump"},
50 {FW_FEATURE_INTERRUPT, "hcall-interrupt"},
51 {FW_FEATURE_MIGRATE, "hcall-migrate"},
52 {FW_FEATURE_PERFMON, "hcall-perfmon"},
53 {FW_FEATURE_CRQ, "hcall-crq"},
54 {FW_FEATURE_VIO, "hcall-vio"},
55 {FW_FEATURE_RDMA, "hcall-rdma"},
56 {FW_FEATURE_LLAN, "hcall-lLAN"},
57 {FW_FEATURE_BULK_REMOVE, "hcall-bulk"},
58 {FW_FEATURE_XDABR, "hcall-xdabr"},
59 {FW_FEATURE_PUT_TCE_IND | FW_FEATURE_STUFF_TCE,
60 "hcall-multi-tce"},
61 {FW_FEATURE_SPLPAR, "hcall-splpar"},
62 {FW_FEATURE_VPHN, "hcall-vphn"},
63 {FW_FEATURE_SET_MODE, "hcall-set-mode"},
64 {FW_FEATURE_BEST_ENERGY, "hcall-best-energy-1*"},
65 {FW_FEATURE_HPT_RESIZE, "hcall-hpt-resize"},
66 {FW_FEATURE_BLOCK_REMOVE, "hcall-block-remove"},
67 {FW_FEATURE_PAPR_SCM, "hcall-scm"},
68 {FW_FEATURE_RPT_INVALIDATE, "hcall-rpt-invalidate"},
69 {FW_FEATURE_ENERGY_SCALE_INFO, "hcall-energy-scale-info"},
70 {FW_FEATURE_WATCHDOG, "hcall-watchdog"},
71 {FW_FEATURE_PLPKS, "hcall-pks"},
72 };
73
74 /* Build up the firmware features bitmask using the contents of
75 * device-tree/ibm,hypertas-functions. Ultimately this functionality may
76 * be moved into prom.c prom_init().
77 */
fw_hypertas_feature_init(const char * hypertas,unsigned long len)78 static void __init fw_hypertas_feature_init(const char *hypertas,
79 unsigned long len)
80 {
81 const char *s;
82 int i;
83
84 pr_debug(" -> fw_hypertas_feature_init()\n");
85
86 for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
87 for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
88 const char *name = hypertas_fw_features_table[i].name;
89 size_t size;
90
91 /*
92 * If there is a '*' at the end of name, only check
93 * upto there
94 */
95 size = strlen(name);
96 if (size && name[size - 1] == '*') {
97 if (strncmp(name, s, size - 1))
98 continue;
99 } else if (strcmp(name, s))
100 continue;
101
102 /* we have a match */
103 powerpc_firmware_features |=
104 hypertas_fw_features_table[i].val;
105 break;
106 }
107 }
108
109 if (is_secure_guest() &&
110 (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) {
111 powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND;
112 pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n");
113 }
114
115 pr_debug(" <- fw_hypertas_feature_init()\n");
116 }
117
118 struct vec5_fw_feature {
119 unsigned long val;
120 unsigned int feature;
121 };
122
123 static __initdata struct vec5_fw_feature
124 vec5_fw_features_table[] = {
125 {FW_FEATURE_FORM1_AFFINITY, OV5_FORM1_AFFINITY},
126 {FW_FEATURE_PRRN, OV5_PRRN},
127 {FW_FEATURE_DRMEM_V2, OV5_DRMEM_V2},
128 {FW_FEATURE_DRC_INFO, OV5_DRC_INFO},
129 {FW_FEATURE_FORM2_AFFINITY, OV5_FORM2_AFFINITY},
130 };
131
fw_vec5_feature_init(const char * vec5,unsigned long len)132 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
133 {
134 unsigned int index, feat;
135 int i;
136
137 pr_debug(" -> fw_vec5_feature_init()\n");
138
139 for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
140 index = OV5_INDX(vec5_fw_features_table[i].feature);
141 feat = OV5_FEAT(vec5_fw_features_table[i].feature);
142
143 if (index < len && (vec5[index] & feat))
144 powerpc_firmware_features |=
145 vec5_fw_features_table[i].val;
146 }
147
148 pr_debug(" <- fw_vec5_feature_init()\n");
149 }
150
151 /*
152 * Called very early, MMU is off, device-tree isn't unflattened
153 */
probe_fw_features(unsigned long node,const char * uname,int depth,void * data)154 static int __init probe_fw_features(unsigned long node, const char *uname, int
155 depth, void *data)
156 {
157 const char *prop;
158 int len;
159 static int hypertas_found;
160 static int vec5_found;
161
162 if (depth != 1)
163 return 0;
164
165 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
166 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
167 &len);
168 if (prop) {
169 powerpc_firmware_features |= FW_FEATURE_LPAR;
170 fw_hypertas_feature_init(prop, len);
171 }
172
173 hypertas_found = 1;
174 }
175
176 if (!strcmp(uname, "chosen")) {
177 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
178 &len);
179 if (prop)
180 fw_vec5_feature_init(prop, len);
181
182 vec5_found = 1;
183 }
184
185 return hypertas_found && vec5_found;
186 }
187
pseries_probe_fw_features(void)188 void __init pseries_probe_fw_features(void)
189 {
190 of_scan_flat_dt(probe_fw_features, NULL);
191 }
192