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 }; 71 72 /* Build up the firmware features bitmask using the contents of 73 * device-tree/ibm,hypertas-functions. Ultimately this functionality may 74 * be moved into prom.c prom_init(). 75 */ 76 static void __init fw_hypertas_feature_init(const char *hypertas, 77 unsigned long len) 78 { 79 const char *s; 80 int i; 81 82 pr_debug(" -> fw_hypertas_feature_init()\n"); 83 84 for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) { 85 for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) { 86 const char *name = hypertas_fw_features_table[i].name; 87 size_t size; 88 89 /* 90 * If there is a '*' at the end of name, only check 91 * upto there 92 */ 93 size = strlen(name); 94 if (size && name[size - 1] == '*') { 95 if (strncmp(name, s, size - 1)) 96 continue; 97 } else if (strcmp(name, s)) 98 continue; 99 100 /* we have a match */ 101 powerpc_firmware_features |= 102 hypertas_fw_features_table[i].val; 103 break; 104 } 105 } 106 107 if (is_secure_guest() && 108 (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) { 109 powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND; 110 pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n"); 111 } 112 113 pr_debug(" <- fw_hypertas_feature_init()\n"); 114 } 115 116 struct vec5_fw_feature { 117 unsigned long val; 118 unsigned int feature; 119 }; 120 121 static __initdata struct vec5_fw_feature 122 vec5_fw_features_table[] = { 123 {FW_FEATURE_FORM1_AFFINITY, OV5_FORM1_AFFINITY}, 124 {FW_FEATURE_PRRN, OV5_PRRN}, 125 {FW_FEATURE_DRMEM_V2, OV5_DRMEM_V2}, 126 {FW_FEATURE_DRC_INFO, OV5_DRC_INFO}, 127 {FW_FEATURE_FORM2_AFFINITY, OV5_FORM2_AFFINITY}, 128 }; 129 130 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len) 131 { 132 unsigned int index, feat; 133 int i; 134 135 pr_debug(" -> fw_vec5_feature_init()\n"); 136 137 for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) { 138 index = OV5_INDX(vec5_fw_features_table[i].feature); 139 feat = OV5_FEAT(vec5_fw_features_table[i].feature); 140 141 if (index < len && (vec5[index] & feat)) 142 powerpc_firmware_features |= 143 vec5_fw_features_table[i].val; 144 } 145 146 pr_debug(" <- fw_vec5_feature_init()\n"); 147 } 148 149 /* 150 * Called very early, MMU is off, device-tree isn't unflattened 151 */ 152 static int __init probe_fw_features(unsigned long node, const char *uname, int 153 depth, void *data) 154 { 155 const char *prop; 156 int len; 157 static int hypertas_found; 158 static int vec5_found; 159 160 if (depth != 1) 161 return 0; 162 163 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) { 164 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions", 165 &len); 166 if (prop) { 167 powerpc_firmware_features |= FW_FEATURE_LPAR; 168 fw_hypertas_feature_init(prop, len); 169 } 170 171 hypertas_found = 1; 172 } 173 174 if (!strcmp(uname, "chosen")) { 175 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5", 176 &len); 177 if (prop) 178 fw_vec5_feature_init(prop, len); 179 180 vec5_found = 1; 181 } 182 183 return hypertas_found && vec5_found; 184 } 185 186 void __init pseries_probe_fw_features(void) 187 { 188 of_scan_flat_dt(probe_fw_features, NULL); 189 } 190