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 ([email protected])
   9  *   Modified by PPC64 Team, IBM Corp
  10  *
  11  *  Portions from arch/powerpc/kernel/firmware.c
  12  *   Copyright (C) 2001 Ben. Herrenschmidt ([email protected])
  13  *   Modifications for ppc64:
  14  *    Copyright (C) 2003 Dave Engebretsen <[email protected]>
  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 }