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lpar.c

/*
 * pSeries_lpar.c
 * Copyright (C) 2001 Todd Inglett, IBM Corporation
 *
 * pSeries LPAR support.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

/* Enables debugging of low-level hash table routines - careful! */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/console.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/abs_addr.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/tlbflush.h>
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/cputable.h>
#include <asm/udbg.h>
#include <asm/smp.h>

#include "plpar_wrappers.h"
#include "pseries.h"


/* in hvCall.S */
EXPORT_SYMBOL(plpar_hcall);
EXPORT_SYMBOL(plpar_hcall9);
EXPORT_SYMBOL(plpar_hcall_norets);

extern void pSeries_find_serial_port(void);


static int vtermno;     /* virtual terminal# for udbg  */

#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
static void udbg_hvsi_putc(char c)
{
      /* packet's seqno isn't used anyways */
      uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
      int rc;

      if (c == '\n')
            udbg_hvsi_putc('\r');

      do {
            rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
      } while (rc == H_BUSY);
}

static long hvsi_udbg_buf_len;
static uint8_t hvsi_udbg_buf[256];

static int udbg_hvsi_getc_poll(void)
{
      unsigned char ch;
      int rc, i;

      if (hvsi_udbg_buf_len == 0) {
            rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
            if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
                  /* bad read or non-data packet */
                  hvsi_udbg_buf_len = 0;
            } else {
                  /* remove the packet header */
                  for (i = 4; i < hvsi_udbg_buf_len; i++)
                        hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
                  hvsi_udbg_buf_len -= 4;
            }
      }

      if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
            /* no data ready */
            hvsi_udbg_buf_len = 0;
            return -1;
      }

      ch = hvsi_udbg_buf[0];
      /* shift remaining data down */
      for (i = 1; i < hvsi_udbg_buf_len; i++) {
            hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
      }
      hvsi_udbg_buf_len--;

      return ch;
}

static int udbg_hvsi_getc(void)
{
      int ch;
      for (;;) {
            ch = udbg_hvsi_getc_poll();
            if (ch == -1) {
                  /* This shouldn't be needed...but... */
                  volatile unsigned long delay;
                  for (delay=0; delay < 2000000; delay++)
                        ;
            } else {
                  return ch;
            }
      }
}

static void udbg_putcLP(char c)
{
      char buf[16];
      unsigned long rc;

      if (c == '\n')
            udbg_putcLP('\r');

      buf[0] = c;
      do {
            rc = plpar_put_term_char(vtermno, 1, buf);
      } while(rc == H_BUSY);
}

/* Buffered chars getc */
static long inbuflen;
static long inbuf[2];   /* must be 2 longs */

static int udbg_getc_pollLP(void)
{
      /* The interface is tricky because it may return up to 16 chars.
       * We save them statically for future calls to udbg_getc().
       */
      char ch, *buf = (char *)inbuf;
      int i;
      long rc;
      if (inbuflen == 0) {
            /* get some more chars. */
            inbuflen = 0;
            rc = plpar_get_term_char(vtermno, &inbuflen, buf);
            if (rc != H_SUCCESS)
                  inbuflen = 0;     /* otherwise inbuflen is garbage */
      }
      if (inbuflen <= 0 || inbuflen > 16) {
            /* Catch error case as well as other oddities (corruption) */
            inbuflen = 0;
            return -1;
      }
      ch = buf[0];
      for (i = 1; i < inbuflen; i++)      /* shuffle them down. */
            buf[i-1] = buf[i];
      inbuflen--;
      return ch;
}

static int udbg_getcLP(void)
{
      int ch;
      for (;;) {
            ch = udbg_getc_pollLP();
            if (ch == -1) {
                  /* This shouldn't be needed...but... */
                  volatile unsigned long delay;
                  for (delay=0; delay < 2000000; delay++)
                        ;
            } else {
                  return ch;
            }
      }
}

/* call this from early_init() for a working debug console on
 * vterm capable LPAR machines
 */
void __init udbg_init_debug_lpar(void)
{
      vtermno = 0;
      udbg_putc = udbg_putcLP;
      udbg_getc = udbg_getcLP;
      udbg_getc_poll = udbg_getc_pollLP;

      register_early_udbg_console();
}

/* returns 0 if couldn't find or use /chosen/stdout as console */
void __init find_udbg_vterm(void)
{
      struct device_node *stdout_node;
      const u32 *termno;
      const char *name;

      /* find the boot console from /chosen/stdout */
      if (!of_chosen)
            return;
      name = of_get_property(of_chosen, "linux,stdout-path", NULL);
      if (name == NULL)
            return;
      stdout_node = of_find_node_by_path(name);
      if (!stdout_node)
            return;
      name = of_get_property(stdout_node, "name", NULL);
      if (!name) {
            printk(KERN_WARNING "stdout node missing 'name' property!\n");
            goto out;
      }

      /* Check if it's a virtual terminal */
      if (strncmp(name, "vty", 3) != 0)
            goto out;
      termno = of_get_property(stdout_node, "reg", NULL);
      if (termno == NULL)
            goto out;
      vtermno = termno[0];

      if (of_device_is_compatible(stdout_node, "hvterm1")) {
            udbg_putc = udbg_putcLP;
            udbg_getc = udbg_getcLP;
            udbg_getc_poll = udbg_getc_pollLP;
            add_preferred_console("hvc", termno[0] & 0xff, NULL);
      } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
            vtermno = termno[0];
            udbg_putc = udbg_hvsi_putc;
            udbg_getc = udbg_hvsi_getc;
            udbg_getc_poll = udbg_hvsi_getc_poll;
            add_preferred_console("hvsi", termno[0] & 0xff, NULL);
      }
out:
      of_node_put(stdout_node);
}

void vpa_init(int cpu)
{
      int hwcpu = get_hard_smp_processor_id(cpu);
      unsigned long addr;
      long ret;

      if (cpu_has_feature(CPU_FTR_ALTIVEC))
            lppaca[cpu].vmxregs_in_use = 1;

      addr = __pa(&lppaca[cpu]);
      ret = register_vpa(hwcpu, addr);

      if (ret) {
            printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
                        "cpu %d (hw %d) of area %lx returns %ld\n",
                        cpu, hwcpu, addr, ret);
            return;
      }
      /*
       * PAPR says this feature is SLB-Buffer but firmware never
       * reports that.  All SPLPAR support SLB shadow buffer.
       */
      addr = __pa(&slb_shadow[cpu]);
      if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
            ret = register_slb_shadow(hwcpu, addr);
            if (ret)
                  printk(KERN_ERR
                         "WARNING: vpa_init: SLB shadow buffer "
                         "registration for cpu %d (hw %d) of area %lx "
                         "returns %ld\n", cpu, hwcpu, addr, ret);
      }
}

static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
                        unsigned long va, unsigned long pa,
                        unsigned long rflags, unsigned long vflags,
                        int psize, int ssize)
{
      unsigned long lpar_rc;
      unsigned long flags;
      unsigned long slot;
      unsigned long hpte_v, hpte_r;

      if (!(vflags & HPTE_V_BOLTED))
            pr_debug("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
                   "rflags=%lx, vflags=%lx, psize=%d)\n",
                   hpte_group, va, pa, rflags, vflags, psize);

      hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID;
      hpte_r = hpte_encode_r(pa, psize) | rflags;

      if (!(vflags & HPTE_V_BOLTED))
            pr_debug(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);

      /* Now fill in the actual HPTE */
      /* Set CEC cookie to 0         */
      /* Zero page = 0               */
      /* I-cache Invalidate = 0      */
      /* I-cache synchronize = 0     */
      /* Exact = 0                   */
      flags = 0;

      /* Make pHyp happy */
      if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
            hpte_r &= ~_PAGE_COHERENT;

      lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
      if (unlikely(lpar_rc == H_PTEG_FULL)) {
            if (!(vflags & HPTE_V_BOLTED))
                  pr_debug(" full\n");
            return -1;
      }

      /*
       * Since we try and ioremap PHBs we don't own, the pte insert
       * will fail. However we must catch the failure in hash_page
       * or we will loop forever, so return -2 in this case.
       */
      if (unlikely(lpar_rc != H_SUCCESS)) {
            if (!(vflags & HPTE_V_BOLTED))
                  pr_debug(" lpar err %lu\n", lpar_rc);
            return -2;
      }
      if (!(vflags & HPTE_V_BOLTED))
            pr_debug(" -> slot: %lu\n", slot & 7);

      /* Because of iSeries, we have to pass down the secondary
       * bucket bit here as well
       */
      return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
}

static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);

static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
{
      unsigned long slot_offset;
      unsigned long lpar_rc;
      int i;
      unsigned long dummy1, dummy2;

      /* pick a random slot to start at */
      slot_offset = mftb() & 0x7;

      for (i = 0; i < HPTES_PER_GROUP; i++) {

            /* don't remove a bolted entry */
            lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
                                 (0x1UL << 4), &dummy1, &dummy2);
            if (lpar_rc == H_SUCCESS)
                  return i;
            BUG_ON(lpar_rc != H_NOT_FOUND);

            slot_offset++;
            slot_offset &= 0x7;
      }

      return -1;
}

static void pSeries_lpar_hptab_clear(void)
{
      unsigned long size_bytes = 1UL << ppc64_pft_size;
      unsigned long hpte_count = size_bytes >> 4;
      unsigned long dummy1, dummy2, dword0;
      long lpar_rc;
      int i;

      /* TODO: Use bulk call */
      for (i = 0; i < hpte_count; i++) {
            /* dont remove HPTEs with VRMA mappings */
            lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG,
                                    &dummy1, &dummy2);
            if (lpar_rc == H_NOT_FOUND) {
                  lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1);
                  if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK)
                        != HPTE_V_VRMA_MASK))
                        /* Can be hpte for 1TB Seg. So remove it */
                        plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2);
            }
      }
}

/*
 * This computes the AVPN and B fields of the first dword of a HPTE,
 * for use when we want to match an existing PTE.  The bottom 7 bits
 * of the returned value are zero.
 */
static inline unsigned long hpte_encode_avpn(unsigned long va, int psize,
                                   int ssize)
{
      unsigned long v;

      v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
      v <<= HPTE_V_AVPN_SHIFT;
      v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
      return v;
}

/*
 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 * the low 3 bits of flags happen to line up.  So no transform is needed.
 * We can probably optimize here and assume the high bits of newpp are
 * already zero.  For now I am paranoid.
 */
static long pSeries_lpar_hpte_updatepp(unsigned long slot,
                               unsigned long newpp,
                               unsigned long va,
                               int psize, int ssize, int local)
{
      unsigned long lpar_rc;
      unsigned long flags = (newpp & 7) | H_AVPN;
      unsigned long want_v;

      want_v = hpte_encode_avpn(va, psize, ssize);

      pr_debug("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
             want_v, slot, flags, psize);

      lpar_rc = plpar_pte_protect(flags, slot, want_v);

      if (lpar_rc == H_NOT_FOUND) {
            pr_debug("not found !\n");
            return -1;
      }

      pr_debug("ok\n");

      BUG_ON(lpar_rc != H_SUCCESS);

      return 0;
}

static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
{
      unsigned long dword0;
      unsigned long lpar_rc;
      unsigned long dummy_word1;
      unsigned long flags;

      /* Read 1 pte at a time                        */
      /* Do not need RPN to logical page translation */
      /* No cross CEC PFT access                     */
      flags = 0;

      lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);

      BUG_ON(lpar_rc != H_SUCCESS);

      return dword0;
}

static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize)
{
      unsigned long hash;
      unsigned long i;
      long slot;
      unsigned long want_v, hpte_v;

      hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize);
      want_v = hpte_encode_avpn(va, psize, ssize);

      /* Bolted entries are always in the primary group */
      slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
      for (i = 0; i < HPTES_PER_GROUP; i++) {
            hpte_v = pSeries_lpar_hpte_getword0(slot);

            if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
                  /* HPTE matches */
                  return slot;
            ++slot;
      }

      return -1;
} 

static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
                                   unsigned long ea,
                                   int psize, int ssize)
{
      unsigned long lpar_rc, slot, vsid, va, flags;

      vsid = get_kernel_vsid(ea, ssize);
      va = hpt_va(ea, vsid, ssize);

      slot = pSeries_lpar_hpte_find(va, psize, ssize);
      BUG_ON(slot == -1);

      flags = newpp & 7;
      lpar_rc = plpar_pte_protect(flags, slot, 0);

      BUG_ON(lpar_rc != H_SUCCESS);
}

static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
                               int psize, int ssize, int local)
{
      unsigned long want_v;
      unsigned long lpar_rc;
      unsigned long dummy1, dummy2;

      pr_debug("    inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
             slot, va, psize, local);

      want_v = hpte_encode_avpn(va, psize, ssize);
      lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
      if (lpar_rc == H_NOT_FOUND)
            return;

      BUG_ON(lpar_rc != H_SUCCESS);
}

static void pSeries_lpar_hpte_removebolted(unsigned long ea,
                                 int psize, int ssize)
{
      unsigned long slot, vsid, va;

      vsid = get_kernel_vsid(ea, ssize);
      va = hpt_va(ea, vsid, ssize);

      slot = pSeries_lpar_hpte_find(va, psize, ssize);
      BUG_ON(slot == -1);

      pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0);
}

/* Flag bits for H_BULK_REMOVE */
#define HBR_REQUEST     0x4000000000000000UL
#define HBR_RESPONSE    0x8000000000000000UL
#define HBR_END         0xc000000000000000UL
#define HBR_AVPN  0x0200000000000000UL
#define HBR_ANDCOND     0x0100000000000000UL

/*
 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 * lock.
 */
static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
{
      unsigned long i, pix, rc;
      unsigned long flags = 0;
      struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
      int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
      unsigned long param[9];
      unsigned long va;
      unsigned long hash, index, shift, hidx, slot;
      real_pte_t pte;
      int psize, ssize;

      if (lock_tlbie)
            spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);

      psize = batch->psize;
      ssize = batch->ssize;
      pix = 0;
      for (i = 0; i < number; i++) {
            va = batch->vaddr[i];
            pte = batch->pte[i];
            pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
                  hash = hpt_hash(va, shift, ssize);
                  hidx = __rpte_to_hidx(pte, index);
                  if (hidx & _PTEIDX_SECONDARY)
                        hash = ~hash;
                  slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
                  slot += hidx & _PTEIDX_GROUP_IX;
                  if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
                        pSeries_lpar_hpte_invalidate(slot, va, psize,
                                               ssize, local);
                  } else {
                        param[pix] = HBR_REQUEST | HBR_AVPN | slot;
                        param[pix+1] = hpte_encode_avpn(va, psize,
                                                ssize);
                        pix += 2;
                        if (pix == 8) {
                              rc = plpar_hcall9(H_BULK_REMOVE, param,
                                    param[0], param[1], param[2],
                                    param[3], param[4], param[5],
                                    param[6], param[7]);
                              BUG_ON(rc != H_SUCCESS);
                              pix = 0;
                        }
                  }
            } pte_iterate_hashed_end();
      }
      if (pix) {
            param[pix] = HBR_END;
            rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
                          param[2], param[3], param[4], param[5],
                          param[6], param[7]);
            BUG_ON(rc != H_SUCCESS);
      }

      if (lock_tlbie)
            spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
}

void __init hpte_init_lpar(void)
{
      ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
      ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
      ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
      ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
      ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
      ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
      ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
      ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
}

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