Quelle  firmware.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  pSeries firmware setup code.
 *
 *  Portions from arch/powerpc/platforms/pseries/setup.c:
 *   Copyright (C) 1995  Linus Torvalds
 *   Adapted from 'alpha' version by Gary Thomas
 *   Modified by Cort Dougan (cort@cs.nmt.edu)
 *   Modified by PPC64 Team, IBM Corp
 *
 *  Portions from arch/powerpc/kernel/firmware.c
 *   Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
 *   Modifications for ppc64:
 *    Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
 *    Copyright (C) 2005 Stephen Rothwell, IBM Corporation
 *
 *  Copyright 2006 IBM Corporation.
 */


#include <linux/of_fdt.h>
#include <asm/firmware.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/svm.h>

#include "pseries.h"

struct hypertas_fw_feature {
    unsigned long val;
    char * name;
};

/*
 * The names in this table match names in rtas/ibm,hypertas-functions.  If the
 * entry ends in a '*', only upto the '*' is matched.  Otherwise the entire
 * string must match.
 */
static __initdata struct hypertas_fw_feature
hypertas_fw_features_table[] = {
 {FW_FEATURE_PFT,  "hcall-pft"},
 {FW_FEATURE_TCE,  "hcall-tce"},
 {FW_FEATURE_SPRG0,  "hcall-sprg0"},
 {FW_FEATURE_DABR,  "hcall-dabr"},
 {FW_FEATURE_COPY,  "hcall-copy"},
 {FW_FEATURE_ASR,  "hcall-asr"},
 {FW_FEATURE_DEBUG,  "hcall-debug"},
 {FW_FEATURE_PERF,  "hcall-perf"},
 {FW_FEATURE_DUMP,  "hcall-dump"},
 {FW_FEATURE_INTERRUPT,  "hcall-interrupt"},
 {FW_FEATURE_MIGRATE,  "hcall-migrate"},
 {FW_FEATURE_PERFMON,  "hcall-perfmon"},
 {FW_FEATURE_CRQ,  "hcall-crq"},
 {FW_FEATURE_VIO,  "hcall-vio"},
 {FW_FEATURE_RDMA,  "hcall-rdma"},
 {FW_FEATURE_LLAN,  "hcall-lLAN"},
 {FW_FEATURE_BULK_REMOVE, "hcall-bulk"},
 {FW_FEATURE_XDABR,  "hcall-xdabr"},
 {FW_FEATURE_PUT_TCE_IND | FW_FEATURE_STUFF_TCE,
     "hcall-multi-tce"},
 {FW_FEATURE_SPLPAR,  "hcall-splpar"},
 {FW_FEATURE_VPHN,  "hcall-vphn"},
 {FW_FEATURE_SET_MODE,  "hcall-set-mode"},
 {FW_FEATURE_BEST_ENERGY, "hcall-best-energy-1*"},
 {FW_FEATURE_HPT_RESIZE,  "hcall-hpt-resize"},
 {FW_FEATURE_BLOCK_REMOVE, "hcall-block-remove"},
 {FW_FEATURE_PAPR_SCM,  "hcall-scm"},
 {FW_FEATURE_RPT_INVALIDATE, "hcall-rpt-invalidate"},
 {FW_FEATURE_ENERGY_SCALE_INFO, "hcall-energy-scale-info"},
 {FW_FEATURE_WATCHDOG,  "hcall-watchdog"},
 {FW_FEATURE_PLPKS,  "hcall-pks"},
};

/* Build up the firmware features bitmask using the contents of
 * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
 * be moved into prom.c prom_init().
 */
static void __init fw_hypertas_feature_init(const char *hypertas,
         unsigned long len)
{
 const char *s;
 int i;

 pr_debug(" -> fw_hypertas_feature_init()\n");

 for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
  for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
   const char *name = hypertas_fw_features_table[i].name;
   size_t size;

   /*
 * If there is a '*' at the end of name, only check
 * upto there
 */
   size = strlen(name);
   if (size && name[size - 1] == '*') {
    if (strncmp(name, s, size - 1))
     continue;
   } else if (strcmp(name, s))
    continue;

   /* we have a match */
   powerpc_firmware_features |=
    hypertas_fw_features_table[i].val;
   break;
  }
 }

 if (is_secure_guest() &&
     (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) {
  powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND;
  pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n");
 }

 pr_debug(" <- fw_hypertas_feature_init()\n");
}

struct vec5_fw_feature {
 unsigned long val;
 unsigned int feature;
};

static __initdata struct vec5_fw_feature
vec5_fw_features_table[] = {
 {FW_FEATURE_FORM1_AFFINITY, OV5_FORM1_AFFINITY},
 {FW_FEATURE_PRRN,  OV5_PRRN},
 {FW_FEATURE_DRMEM_V2,  OV5_DRMEM_V2},
 {FW_FEATURE_DRC_INFO,  OV5_DRC_INFO},
 {FW_FEATURE_FORM2_AFFINITY, OV5_FORM2_AFFINITY},
};

static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
{
 unsigned int index, feat;
 int i;

 pr_debug(" -> fw_vec5_feature_init()\n");

 for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
  index = OV5_INDX(vec5_fw_features_table[i].feature);
  feat = OV5_FEAT(vec5_fw_features_table[i].feature);

  if (index < len && (vec5[index] & feat))
   powerpc_firmware_features |=
    vec5_fw_features_table[i].val;
 }

 pr_debug(" <- fw_vec5_feature_init()\n");
}

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init probe_fw_features(unsigned long node, const char *uname, int
        depth, void *data)
{
 const char *prop;
 int len;
 static int hypertas_found;
 static int vec5_found;

 if (depth != 1)
  return 0;

 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
  prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
        &len);
  if (prop) {
   powerpc_firmware_features |= FW_FEATURE_LPAR;
   fw_hypertas_feature_init(prop, len);
  }

  hypertas_found = 1;
 }

 if (!strcmp(uname, "chosen")) {
  prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
        &len);
  if (prop)
   fw_vec5_feature_init(prop, len);

  vec5_found = 1;
 }

 return hypertas_found && vec5_found;
}

void __init pseries_probe_fw_features(void)
{
 of_scan_flat_dt(probe_fw_features, NULL);
}