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mips-mt.c

/*
 * General MIPS MT support routines, usable in AP/SP, SMVP, or SMTC kernels
 * Copyright (C) 2005 Mips Technologies, Inc
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/security.h>

#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/atomic.h>
#include <asm/system.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
#include <asm/mipsmtregs.h>
#include <asm/r4kcache.h>
#include <asm/cacheflush.h>

int vpelimit;

static int __init maxvpes(char *str)
{
      get_option(&str, &vpelimit);

      return 1;
}

__setup("maxvpes=", maxvpes);

int tclimit;

static int __init maxtcs(char *str)
{
      get_option(&str, &tclimit);

      return 1;
}

__setup("maxtcs=", maxtcs);

/*
 * Dump new MIPS MT state for the core. Does not leave TCs halted.
 * Takes an argument which taken to be a pre-call MVPControl value.
 */

void mips_mt_regdump(unsigned long mvpctl)
{
      unsigned long flags;
      unsigned long vpflags;
      unsigned long mvpconf0;
      int nvpe;
      int ntc;
      int i;
      int tc;
      unsigned long haltval;
      unsigned long tcstatval;
#ifdef CONFIG_MIPS_MT_SMTC
      void smtc_soft_dump(void);
#endif /* CONFIG_MIPT_MT_SMTC */

      local_irq_save(flags);
      vpflags = dvpe();
      printk("=== MIPS MT State Dump ===\n");
      printk("-- Global State --\n");
      printk("   MVPControl Passed: %08lx\n", mvpctl);
      printk("   MVPControl Read: %08lx\n", vpflags);
      printk("   MVPConf0 : %08lx\n", (mvpconf0 = read_c0_mvpconf0()));
      nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
      ntc = ((mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1;
      printk("-- per-VPE State --\n");
      for (i = 0; i < nvpe; i++) {
            for (tc = 0; tc < ntc; tc++) {
                  settc(tc);
                  if ((read_tc_c0_tcbind() & TCBIND_CURVPE) == i) {
                        printk("  VPE %d\n", i);
                        printk("   VPEControl : %08lx\n",
                               read_vpe_c0_vpecontrol());
                        printk("   VPEConf0 : %08lx\n",
                               read_vpe_c0_vpeconf0());
                        printk("   VPE%d.Status : %08lx\n",
                               i, read_vpe_c0_status());
                        printk("   VPE%d.EPC : %08lx %pS\n",
                               i, read_vpe_c0_epc(),
                               (void *) read_vpe_c0_epc());
                        printk("   VPE%d.Cause : %08lx\n",
                               i, read_vpe_c0_cause());
                        printk("   VPE%d.Config7 : %08lx\n",
                               i, read_vpe_c0_config7());
                        break; /* Next VPE */
                  }
            }
      }
      printk("-- per-TC State --\n");
      for (tc = 0; tc < ntc; tc++) {
            settc(tc);
            if (read_tc_c0_tcbind() == read_c0_tcbind()) {
                  /* Are we dumping ourself?  */
                  haltval = 0; /* Then we're not halted, and mustn't be */
                  tcstatval = flags; /* And pre-dump TCStatus is flags */
                  printk("  TC %d (current TC with VPE EPC above)\n", tc);
            } else {
                  haltval = read_tc_c0_tchalt();
                  write_tc_c0_tchalt(1);
                  tcstatval = read_tc_c0_tcstatus();
                  printk("  TC %d\n", tc);
            }
            printk("   TCStatus : %08lx\n", tcstatval);
            printk("   TCBind : %08lx\n", read_tc_c0_tcbind());
            printk("   TCRestart : %08lx %pS\n",
                   read_tc_c0_tcrestart(), (void *) read_tc_c0_tcrestart());
            printk("   TCHalt : %08lx\n", haltval);
            printk("   TCContext : %08lx\n", read_tc_c0_tccontext());
            if (!haltval)
                  write_tc_c0_tchalt(0);
      }
#ifdef CONFIG_MIPS_MT_SMTC
      smtc_soft_dump();
#endif /* CONFIG_MIPT_MT_SMTC */
      printk("===========================\n");
      evpe(vpflags);
      local_irq_restore(flags);
}

static int mt_opt_norps = 0;
static int mt_opt_rpsctl = -1;
static int mt_opt_nblsu = -1;
static int mt_opt_forceconfig7 = 0;
static int mt_opt_config7 = -1;

static int __init rps_disable(char *s)
{
      mt_opt_norps = 1;
      return 1;
}
__setup("norps", rps_disable);

static int __init rpsctl_set(char *str)
{
      get_option(&str, &mt_opt_rpsctl);
      return 1;
}
__setup("rpsctl=", rpsctl_set);

static int __init nblsu_set(char *str)
{
      get_option(&str, &mt_opt_nblsu);
      return 1;
}
__setup("nblsu=", nblsu_set);

static int __init config7_set(char *str)
{
      get_option(&str, &mt_opt_config7);
      mt_opt_forceconfig7 = 1;
      return 1;
}
__setup("config7=", config7_set);

/* Experimental cache flush control parameters that should go away some day */
int mt_protiflush = 0;
int mt_protdflush = 0;
int mt_n_iflushes = 1;
int mt_n_dflushes = 1;

static int __init set_protiflush(char *s)
{
      mt_protiflush = 1;
      return 1;
}
__setup("protiflush", set_protiflush);

static int __init set_protdflush(char *s)
{
      mt_protdflush = 1;
      return 1;
}
__setup("protdflush", set_protdflush);

static int __init niflush(char *s)
{
      get_option(&s, &mt_n_iflushes);
      return 1;
}
__setup("niflush=", niflush);

static int __init ndflush(char *s)
{
      get_option(&s, &mt_n_dflushes);
      return 1;
}
__setup("ndflush=", ndflush);

static unsigned int itc_base = 0;

static int __init set_itc_base(char *str)
{
      get_option(&str, &itc_base);
      return 1;
}

__setup("itcbase=", set_itc_base);

void mips_mt_set_cpuoptions(void)
{
      unsigned int oconfig7 = read_c0_config7();
      unsigned int nconfig7 = oconfig7;

      if (mt_opt_norps) {
            printk("\"norps\" option deprectated: use \"rpsctl=\"\n");
      }
      if (mt_opt_rpsctl >= 0) {
            printk("34K return prediction stack override set to %d.\n",
                  mt_opt_rpsctl);
            if (mt_opt_rpsctl)
                  nconfig7 |= (1 << 2);
            else
                  nconfig7 &= ~(1 << 2);
      }
      if (mt_opt_nblsu >= 0) {
            printk("34K ALU/LSU sync override set to %d.\n", mt_opt_nblsu);
            if (mt_opt_nblsu)
                  nconfig7 |= (1 << 5);
            else
                  nconfig7 &= ~(1 << 5);
      }
      if (mt_opt_forceconfig7) {
            printk("CP0.Config7 forced to 0x%08x.\n", mt_opt_config7);
            nconfig7 = mt_opt_config7;
      }
      if (oconfig7 != nconfig7) {
            __asm__ __volatile("sync");
            write_c0_config7(nconfig7);
            ehb();
            printk("Config7: 0x%08x\n", read_c0_config7());
      }

      /* Report Cache management debug options */
      if (mt_protiflush)
            printk("I-cache flushes single-threaded\n");
      if (mt_protdflush)
            printk("D-cache flushes single-threaded\n");
      if (mt_n_iflushes != 1)
            printk("I-Cache Flushes Repeated %d times\n", mt_n_iflushes);
      if (mt_n_dflushes != 1)
            printk("D-Cache Flushes Repeated %d times\n", mt_n_dflushes);

      if (itc_base != 0) {
            /*
             * Configure ITC mapping.  This code is very
             * specific to the 34K core family, which uses
             * a special mode bit ("ITC") in the ErrCtl
             * register to enable access to ITC control
             * registers via cache "tag" operations.
             */
            unsigned long ectlval;
            unsigned long itcblkgrn;

            /* ErrCtl register is known as "ecc" to Linux */
            ectlval = read_c0_ecc();
            write_c0_ecc(ectlval | (0x1 << 26));
            ehb();
#define INDEX_0 (0x80000000)
#define INDEX_8 (0x80000008)
            /* Read "cache tag" for Dcache pseudo-index 8 */
            cache_op(Index_Load_Tag_D, INDEX_8);
            ehb();
            itcblkgrn = read_c0_dtaglo();
            itcblkgrn &= 0xfffe0000;
            /* Set for 128 byte pitch of ITC cells */
            itcblkgrn |= 0x00000c00;
            /* Stage in Tag register */
            write_c0_dtaglo(itcblkgrn);
            ehb();
            /* Write out to ITU with CACHE op */
            cache_op(Index_Store_Tag_D, INDEX_8);
            /* Now set base address, and turn ITC on with 0x1 bit */
            write_c0_dtaglo((itc_base & 0xfffffc00) | 0x1 );
            ehb();
            /* Write out to ITU with CACHE op */
            cache_op(Index_Store_Tag_D, INDEX_0);
            write_c0_ecc(ectlval);
            ehb();
            printk("Mapped %ld ITC cells starting at 0x%08x\n",
                  ((itcblkgrn & 0x7fe00000) >> 20), itc_base);
      }
}

/*
 * Function to protect cache flushes from concurrent execution
 * depends on MP software model chosen.
 */

void mt_cflush_lockdown(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
      void smtc_cflush_lockdown(void);

      smtc_cflush_lockdown();
#endif /* CONFIG_MIPS_MT_SMTC */
      /* FILL IN VSMP and AP/SP VERSIONS HERE */
}

void mt_cflush_release(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
      void smtc_cflush_release(void);

      smtc_cflush_release();
#endif /* CONFIG_MIPS_MT_SMTC */
      /* FILL IN VSMP and AP/SP VERSIONS HERE */
}

struct class *mt_class;

static int __init mt_init(void)
{
      struct class *mtc;

      mtc = class_create(THIS_MODULE, "mt");
      if (IS_ERR(mtc))
            return PTR_ERR(mtc);

      mt_class = mtc;

      return 0;
}

subsys_initcall(mt_init);

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