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