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 }; 72 73 /* Build up the firmware features bitmask using the contents of 74 * device-tree/ibm,hypertas-functions. Ultimately this functionality may 75 * be moved into prom.c prom_init(). 76 */ 77 static void __init fw_hypertas_feature_init(const char *hypertas, 78 unsigned long len) 79 { 80 const char *s; 81 int i; 82 83 pr_debug(" -> fw_hypertas_feature_init()\n"); 84 85 for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) { 86 for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) { 87 const char *name = hypertas_fw_features_table[i].name; 88 size_t size; 89 90 /* 91 * If there is a '*' at the end of name, only check 92 * upto there 93 */ 94 size = strlen(name); 95 if (size && name[size - 1] == '*') { 96 if (strncmp(name, s, size - 1)) 97 continue; 98 } else if (strcmp(name, s)) 99 continue; 100 101 /* we have a match */ 102 powerpc_firmware_features |= 103 hypertas_fw_features_table[i].val; 104 break; 105 } 106 } 107 108 if (is_secure_guest() && 109 (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) { 110 powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND; 111 pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n"); 112 } 113 114 pr_debug(" <- fw_hypertas_feature_init()\n"); 115 } 116 117 struct vec5_fw_feature { 118 unsigned long val; 119 unsigned int feature; 120 }; 121 122 static __initdata struct vec5_fw_feature 123 vec5_fw_features_table[] = { 124 {FW_FEATURE_FORM1_AFFINITY, OV5_FORM1_AFFINITY}, 125 {FW_FEATURE_PRRN, OV5_PRRN}, 126 {FW_FEATURE_DRMEM_V2, OV5_DRMEM_V2}, 127 {FW_FEATURE_DRC_INFO, OV5_DRC_INFO}, 128 {FW_FEATURE_FORM2_AFFINITY, OV5_FORM2_AFFINITY}, 129 }; 130 131 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len) 132 { 133 unsigned int index, feat; 134 int i; 135 136 pr_debug(" -> fw_vec5_feature_init()\n"); 137 138 for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) { 139 index = OV5_INDX(vec5_fw_features_table[i].feature); 140 feat = OV5_FEAT(vec5_fw_features_table[i].feature); 141 142 if (index < len && (vec5[index] & feat)) 143 powerpc_firmware_features |= 144 vec5_fw_features_table[i].val; 145 } 146 147 pr_debug(" <- fw_vec5_feature_init()\n"); 148 } 149 150 /* 151 * Called very early, MMU is off, device-tree isn't unflattened 152 */ 153 static int __init probe_fw_features(unsigned long node, const char *uname, int 154 depth, void *data) 155 { 156 const char *prop; 157 int len; 158 static int hypertas_found; 159 static int vec5_found; 160 161 if (depth != 1) 162 return 0; 163 164 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) { 165 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions", 166 &len); 167 if (prop) { 168 powerpc_firmware_features |= FW_FEATURE_LPAR; 169 fw_hypertas_feature_init(prop, len); 170 } 171 172 hypertas_found = 1; 173 } 174 175 if (!strcmp(uname, "chosen")) { 176 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5", 177 &len); 178 if (prop) 179 fw_vec5_feature_init(prop, len); 180 181 vec5_found = 1; 182 } 183 184 return hypertas_found && vec5_found; 185 } 186 187 void __init pseries_probe_fw_features(void) 188 { 189 of_scan_flat_dt(probe_fw_features, NULL); 190 } 191