root/arch/powerpc/platforms/pseries/firmware.c

DEFINITIONS

1. fw_hypertas_feature_init
2. fw_vec5_feature_init
3. probe_fw_features
4. pseries_probe_fw_features

   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 
  26 #include "pseries.h"
  27 
  28 struct hypertas_fw_feature {
  29     unsigned long val;
  30     char * name;
  31 };
  32 
  33 /*
  34  * The names in this table match names in rtas/ibm,hypertas-functions.  If the
  35  * entry ends in a '*', only upto the '*' is matched.  Otherwise the entire
  36  * string must match.
  37  */
  38 static __initdata struct hypertas_fw_feature
  39 hypertas_fw_features_table[] = {
  40         {FW_FEATURE_PFT,                "hcall-pft"},
  41         {FW_FEATURE_TCE,                "hcall-tce"},
  42         {FW_FEATURE_SPRG0,              "hcall-sprg0"},
  43         {FW_FEATURE_DABR,               "hcall-dabr"},
  44         {FW_FEATURE_COPY,               "hcall-copy"},
  45         {FW_FEATURE_ASR,                "hcall-asr"},
  46         {FW_FEATURE_DEBUG,              "hcall-debug"},
  47         {FW_FEATURE_PERF,               "hcall-perf"},
  48         {FW_FEATURE_DUMP,               "hcall-dump"},
  49         {FW_FEATURE_INTERRUPT,          "hcall-interrupt"},
  50         {FW_FEATURE_MIGRATE,            "hcall-migrate"},
  51         {FW_FEATURE_PERFMON,            "hcall-perfmon"},
  52         {FW_FEATURE_CRQ,                "hcall-crq"},
  53         {FW_FEATURE_VIO,                "hcall-vio"},
  54         {FW_FEATURE_RDMA,               "hcall-rdma"},
  55         {FW_FEATURE_LLAN,               "hcall-lLAN"},
  56         {FW_FEATURE_BULK_REMOVE,        "hcall-bulk"},
  57         {FW_FEATURE_XDABR,              "hcall-xdabr"},
  58         {FW_FEATURE_MULTITCE,           "hcall-multi-tce"},
  59         {FW_FEATURE_SPLPAR,             "hcall-splpar"},
  60         {FW_FEATURE_VPHN,               "hcall-vphn"},
  61         {FW_FEATURE_SET_MODE,           "hcall-set-mode"},
  62         {FW_FEATURE_BEST_ENERGY,        "hcall-best-energy-1*"},
  63         {FW_FEATURE_HPT_RESIZE,         "hcall-hpt-resize"},
  64         {FW_FEATURE_BLOCK_REMOVE,       "hcall-block-remove"},
  65         {FW_FEATURE_PAPR_SCM,           "hcall-scm"},
  66 };
  67 
  68 /* Build up the firmware features bitmask using the contents of
  69  * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
  70  * be moved into prom.c prom_init().
  71  */
  72 static void __init fw_hypertas_feature_init(const char *hypertas,
  73                                             unsigned long len)
  74 {
  75         const char *s;
  76         int i;
  77 
  78         pr_debug(" -> fw_hypertas_feature_init()\n");
  79 
  80         for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
  81                 for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
  82                         const char *name = hypertas_fw_features_table[i].name;
  83                         size_t size;
  84 
  85                         /*
  86                          * If there is a '*' at the end of name, only check
  87                          * upto there
  88                          */
  89                         size = strlen(name);
  90                         if (size && name[size - 1] == '*') {
  91                                 if (strncmp(name, s, size - 1))
  92                                         continue;
  93                         } else if (strcmp(name, s))
  94                                 continue;
  95 
  96                         /* we have a match */
  97                         powerpc_firmware_features |=
  98                                 hypertas_fw_features_table[i].val;
  99                         break;
 100                 }
 101         }
 102 
 103         pr_debug(" <- fw_hypertas_feature_init()\n");
 104 }
 105 
 106 struct vec5_fw_feature {
 107         unsigned long   val;
 108         unsigned int    feature;
 109 };
 110 
 111 static __initdata struct vec5_fw_feature
 112 vec5_fw_features_table[] = {
 113         {FW_FEATURE_TYPE1_AFFINITY,     OV5_TYPE1_AFFINITY},
 114         {FW_FEATURE_PRRN,               OV5_PRRN},
 115         {FW_FEATURE_DRMEM_V2,           OV5_DRMEM_V2},
 116         {FW_FEATURE_DRC_INFO,           OV5_DRC_INFO},
 117 };
 118 
 119 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
 120 {
 121         unsigned int index, feat;
 122         int i;
 123 
 124         pr_debug(" -> fw_vec5_feature_init()\n");
 125 
 126         for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
 127                 index = OV5_INDX(vec5_fw_features_table[i].feature);
 128                 feat = OV5_FEAT(vec5_fw_features_table[i].feature);
 129 
 130                 if (index < len && (vec5[index] & feat))
 131                         powerpc_firmware_features |=
 132                                 vec5_fw_features_table[i].val;
 133         }
 134 
 135         pr_debug(" <- fw_vec5_feature_init()\n");
 136 }
 137 
 138 /*
 139  * Called very early, MMU is off, device-tree isn't unflattened
 140  */
 141 static int __init probe_fw_features(unsigned long node, const char *uname, int
 142                                     depth, void *data)
 143 {
 144         const char *prop;
 145         int len;
 146         static int hypertas_found;
 147         static int vec5_found;
 148 
 149         if (depth != 1)
 150                 return 0;
 151 
 152         if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
 153                 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
 154                                            &len);
 155                 if (prop) {
 156                         powerpc_firmware_features |= FW_FEATURE_LPAR;
 157                         fw_hypertas_feature_init(prop, len);
 158                 }
 159 
 160                 hypertas_found = 1;
 161         }
 162 
 163         if (!strcmp(uname, "chosen")) {
 164                 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
 165                                            &len);
 166                 if (prop)
 167                         fw_vec5_feature_init(prop, len);
 168 
 169                 vec5_found = 1;
 170         }
 171 
 172         return hypertas_found && vec5_found;
 173 }
 174 
 175 void __init pseries_probe_fw_features(void)
 176 {
 177         of_scan_flat_dt(probe_fw_features, NULL);
 178 }