254 lines
6.0 KiB
C
254 lines
6.0 KiB
C
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/*
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* iSeries hashtable management.
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* Derived from pSeries_htab.c
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*
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* SMP scalability work:
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* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/machdep.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/mmu_context.h>
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#include <asm/abs_addr.h>
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#include <linux/spinlock.h>
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#include "call_hpt.h"
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static spinlock_t iSeries_hlocks[64] __cacheline_aligned_in_smp =
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{ [0 ... 63] = SPIN_LOCK_UNLOCKED};
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/*
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* Very primitive algorithm for picking up a lock
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*/
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static inline void iSeries_hlock(unsigned long slot)
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{
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if (slot & 0x8)
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slot = ~slot;
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spin_lock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
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}
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static inline void iSeries_hunlock(unsigned long slot)
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{
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if (slot & 0x8)
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slot = ~slot;
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spin_unlock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
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}
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static long iSeries_hpte_insert(unsigned long hpte_group, unsigned long va,
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unsigned long pa, unsigned long rflags,
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unsigned long vflags, int psize, int ssize)
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{
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long slot;
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struct hash_pte lhpte;
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int secondary = 0;
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BUG_ON(psize != MMU_PAGE_4K);
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/*
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* The hypervisor tries both primary and secondary.
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* If we are being called to insert in the secondary,
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* it means we have already tried both primary and secondary,
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* so we return failure immediately.
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*/
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if (vflags & HPTE_V_SECONDARY)
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return -1;
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iSeries_hlock(hpte_group);
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slot = HvCallHpt_findValid(&lhpte, va >> HW_PAGE_SHIFT);
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if (unlikely(lhpte.v & HPTE_V_VALID)) {
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if (vflags & HPTE_V_BOLTED) {
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HvCallHpt_setSwBits(slot, 0x10, 0);
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HvCallHpt_setPp(slot, PP_RWXX);
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iSeries_hunlock(hpte_group);
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if (slot < 0)
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return 0x8 | (slot & 7);
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else
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return slot & 7;
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}
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BUG();
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}
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if (slot == -1) { /* No available entry found in either group */
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iSeries_hunlock(hpte_group);
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return -1;
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}
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if (slot < 0) { /* MSB set means secondary group */
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vflags |= HPTE_V_SECONDARY;
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secondary = 1;
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slot &= 0x7fffffffffffffff;
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}
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lhpte.v = hpte_encode_v(va, MMU_PAGE_4K, MMU_SEGSIZE_256M) |
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vflags | HPTE_V_VALID;
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lhpte.r = hpte_encode_r(phys_to_abs(pa), MMU_PAGE_4K) | rflags;
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/* Now fill in the actual HPTE */
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HvCallHpt_addValidate(slot, secondary, &lhpte);
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iSeries_hunlock(hpte_group);
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return (secondary << 3) | (slot & 7);
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}
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static unsigned long iSeries_hpte_getword0(unsigned long slot)
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{
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struct hash_pte hpte;
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HvCallHpt_get(&hpte, slot);
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return hpte.v;
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}
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static long iSeries_hpte_remove(unsigned long hpte_group)
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{
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unsigned long slot_offset;
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int i;
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unsigned long hpte_v;
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/* Pick a random slot to start at */
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slot_offset = mftb() & 0x7;
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iSeries_hlock(hpte_group);
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for (i = 0; i < HPTES_PER_GROUP; i++) {
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hpte_v = iSeries_hpte_getword0(hpte_group + slot_offset);
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if (! (hpte_v & HPTE_V_BOLTED)) {
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HvCallHpt_invalidateSetSwBitsGet(hpte_group +
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slot_offset, 0, 0);
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iSeries_hunlock(hpte_group);
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return i;
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}
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slot_offset++;
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slot_offset &= 0x7;
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}
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iSeries_hunlock(hpte_group);
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return -1;
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}
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/*
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* The HyperVisor expects the "flags" argument in this form:
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* bits 0..59 : reserved
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* bit 60 : N
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* bits 61..63 : PP2,PP1,PP0
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*/
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static long iSeries_hpte_updatepp(unsigned long slot, unsigned long newpp,
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unsigned long va, int psize, int ssize, int local)
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{
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struct hash_pte hpte;
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unsigned long want_v;
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iSeries_hlock(slot);
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HvCallHpt_get(&hpte, slot);
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want_v = hpte_encode_v(va, MMU_PAGE_4K, MMU_SEGSIZE_256M);
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if (HPTE_V_COMPARE(hpte.v, want_v) && (hpte.v & HPTE_V_VALID)) {
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/*
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* Hypervisor expects bits as NPPP, which is
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* different from how they are mapped in our PP.
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*/
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HvCallHpt_setPp(slot, (newpp & 0x3) | ((newpp & 0x4) << 1));
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iSeries_hunlock(slot);
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return 0;
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}
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iSeries_hunlock(slot);
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return -1;
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}
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/*
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* Functions used to find the PTE for a particular virtual address.
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* Only used during boot when bolting pages.
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*
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* Input : vpn : virtual page number
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* Output: PTE index within the page table of the entry
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* -1 on failure
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*/
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static long iSeries_hpte_find(unsigned long vpn)
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{
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struct hash_pte hpte;
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long slot;
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/*
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* The HvCallHpt_findValid interface is as follows:
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* 0xffffffffffffffff : No entry found.
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* 0x00000000xxxxxxxx : Entry found in primary group, slot x
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* 0x80000000xxxxxxxx : Entry found in secondary group, slot x
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*/
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slot = HvCallHpt_findValid(&hpte, vpn);
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if (hpte.v & HPTE_V_VALID) {
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if (slot < 0) {
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slot &= 0x7fffffffffffffff;
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slot = -slot;
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}
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} else
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slot = -1;
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return slot;
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}
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/*
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* Update the page protection bits. Intended to be used to create
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* guard pages for kernel data structures on pages which are bolted
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* in the HPT. Assumes pages being operated on will not be stolen.
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* Does not work on large pages.
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*
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* No need to lock here because we should be the only user.
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*/
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static void iSeries_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
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int psize, int ssize)
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{
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unsigned long vsid,va,vpn;
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long slot;
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BUG_ON(psize != MMU_PAGE_4K);
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vsid = get_kernel_vsid(ea, MMU_SEGSIZE_256M);
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va = (vsid << 28) | (ea & 0x0fffffff);
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vpn = va >> HW_PAGE_SHIFT;
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slot = iSeries_hpte_find(vpn);
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if (slot == -1)
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panic("updateboltedpp: Could not find page to bolt\n");
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HvCallHpt_setPp(slot, newpp);
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}
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static void iSeries_hpte_invalidate(unsigned long slot, unsigned long va,
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int psize, int ssize, int local)
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{
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unsigned long hpte_v;
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unsigned long avpn = va >> 23;
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unsigned long flags;
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local_irq_save(flags);
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iSeries_hlock(slot);
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hpte_v = iSeries_hpte_getword0(slot);
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if ((HPTE_V_AVPN_VAL(hpte_v) == avpn) && (hpte_v & HPTE_V_VALID))
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HvCallHpt_invalidateSetSwBitsGet(slot, 0, 0);
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iSeries_hunlock(slot);
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local_irq_restore(flags);
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}
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void __init hpte_init_iSeries(void)
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{
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ppc_md.hpte_invalidate = iSeries_hpte_invalidate;
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ppc_md.hpte_updatepp = iSeries_hpte_updatepp;
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ppc_md.hpte_updateboltedpp = iSeries_hpte_updateboltedpp;
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ppc_md.hpte_insert = iSeries_hpte_insert;
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ppc_md.hpte_remove = iSeries_hpte_remove;
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}
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