arch/powerpc/platforms/pseries/firmware.c

   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 };
  70
  71 /* Build up the firmware features bitmask using the contents of
  72  * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
  73  * be moved into prom.c prom_init().
  74  */
  75 static void __init fw_hypertas_feature_init(const char *hypertas,
  76                                             unsigned long len)
  77 {
  78         const char *s;
  79         int i;
  80
  81         pr_debug(" -> fw_hypertas_feature_init()\n");
  82
  83         for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
  84                 for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
  85                         const char *name = hypertas_fw_features_table[i].name;
  86                         size_t size;
  87
  88                         /*
  89                          * If there is a '*' at the end of name, only check
  90                          * upto there
  91                          */
  92                         size = strlen(name);
  93                         if (size && name[size - 1] == '*') {
  94                                 if (strncmp(name, s, size - 1))
  95                                         continue;
  96                         } else if (strcmp(name, s))
  97                                 continue;
  98
  99                         /* we have a match */
 100                         powerpc_firmware_features |=
 101                                 hypertas_fw_features_table[i].val;
 102                         break;
 103                 }
 104         }
 105
 106         if (is_secure_guest() &&
 107             (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) {
 108                 powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND;
 109                 pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n");
 110         }
 111
 112         pr_debug(" <- fw_hypertas_feature_init()\n");
 113 }
 114
 115 struct vec5_fw_feature {
 116         unsigned long   val;
 117         unsigned int    feature;
 118 };
 119
 120 static __initdata struct vec5_fw_feature
 121 vec5_fw_features_table[] = {
 122         {FW_FEATURE_TYPE1_AFFINITY,     OV5_TYPE1_AFFINITY},
 123         {FW_FEATURE_PRRN,               OV5_PRRN},
 124         {FW_FEATURE_DRMEM_V2,           OV5_DRMEM_V2},
 125         {FW_FEATURE_DRC_INFO,           OV5_DRC_INFO},
 126 };
 127
 128 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
 129 {
 130         unsigned int index, feat;
 131         int i;
 132
 133         pr_debug(" -> fw_vec5_feature_init()\n");
 134
 135         for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
 136                 index = OV5_INDX(vec5_fw_features_table[i].feature);
 137                 feat = OV5_FEAT(vec5_fw_features_table[i].feature);
 138
 139                 if (index < len && (vec5[index] & feat))
 140                         powerpc_firmware_features |=
 141                                 vec5_fw_features_table[i].val;
 142         }
 143
 144         pr_debug(" <- fw_vec5_feature_init()\n");
 145 }
 146
 147 /*
 148  * Called very early, MMU is off, device-tree isn't unflattened
 149  */
 150 static int __init probe_fw_features(unsigned long node, const char *uname, int
 151                                     depth, void *data)
 152 {
 153         const char *prop;
 154         int len;
 155         static int hypertas_found;
 156         static int vec5_found;
 157
 158         if (depth != 1)
 159                 return 0;
 160
 161         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
 162                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
 163                                            &len);
 164                 if (prop) {
 165                         powerpc_firmware_features |= FW_FEATURE_LPAR;
 166                         fw_hypertas_feature_init(prop, len);
 167                 }
 168
 169                 hypertas_found = 1;
 170         }
 171
 172         if (!strcmp(uname, "chosen")) {
 173                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
 174                                            &len);
 175                 if (prop)
 176                         fw_vec5_feature_init(prop, len);
 177
 178                 vec5_found = 1;
 179         }
 180
 181         return hypertas_found && vec5_found;
 182 }
 183
 184 void __init pseries_probe_fw_features(void)
 185 {
 186         of_scan_flat_dt(probe_fw_features, NULL);
 187 }