| /* |
| * "Cell Reference Set" HTAB support. |
| * |
| * (C) Copyright 2006-2007 TOSHIBA CORPORATION |
| * |
| * This code is based on arch/powerpc/platforms/pseries/lpar.c: |
| * Copyright (C) 2001 Todd Inglett, IBM Corporation |
| * |
| * 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., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| #undef DEBUG_LOW |
| |
| #include <linux/kernel.h> |
| #include <linux/spinlock.h> |
| |
| #include <asm/mmu.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/machdep.h> |
| #include <asm/udbg.h> |
| |
| #include "beat_wrapper.h" |
| |
| #ifdef DEBUG_LOW |
| #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0) |
| #else |
| #define DBG_LOW(fmt...) do { } while(0) |
| #endif |
| |
| static DEFINE_SPINLOCK(beat_htab_lock); |
| |
| static inline unsigned int beat_read_mask(unsigned hpte_group) |
| { |
| unsigned long hpte_v[5]; |
| unsigned long rmask = 0; |
| |
| beat_read_htab_entries(0, hpte_group + 0, hpte_v); |
| if (!(hpte_v[0] & HPTE_V_BOLTED)) |
| rmask |= 0x8000; |
| if (!(hpte_v[1] & HPTE_V_BOLTED)) |
| rmask |= 0x4000; |
| if (!(hpte_v[2] & HPTE_V_BOLTED)) |
| rmask |= 0x2000; |
| if (!(hpte_v[3] & HPTE_V_BOLTED)) |
| rmask |= 0x1000; |
| beat_read_htab_entries(0, hpte_group + 4, hpte_v); |
| if (!(hpte_v[0] & HPTE_V_BOLTED)) |
| rmask |= 0x0800; |
| if (!(hpte_v[1] & HPTE_V_BOLTED)) |
| rmask |= 0x0400; |
| if (!(hpte_v[2] & HPTE_V_BOLTED)) |
| rmask |= 0x0200; |
| if (!(hpte_v[3] & HPTE_V_BOLTED)) |
| rmask |= 0x0100; |
| hpte_group = ~hpte_group & (htab_hash_mask * HPTES_PER_GROUP); |
| beat_read_htab_entries(0, hpte_group + 0, hpte_v); |
| if (!(hpte_v[0] & HPTE_V_BOLTED)) |
| rmask |= 0x80; |
| if (!(hpte_v[1] & HPTE_V_BOLTED)) |
| rmask |= 0x40; |
| if (!(hpte_v[2] & HPTE_V_BOLTED)) |
| rmask |= 0x20; |
| if (!(hpte_v[3] & HPTE_V_BOLTED)) |
| rmask |= 0x10; |
| beat_read_htab_entries(0, hpte_group + 4, hpte_v); |
| if (!(hpte_v[0] & HPTE_V_BOLTED)) |
| rmask |= 0x08; |
| if (!(hpte_v[1] & HPTE_V_BOLTED)) |
| rmask |= 0x04; |
| if (!(hpte_v[2] & HPTE_V_BOLTED)) |
| rmask |= 0x02; |
| if (!(hpte_v[3] & HPTE_V_BOLTED)) |
| rmask |= 0x01; |
| return rmask; |
| } |
| |
| static long beat_lpar_hpte_insert(unsigned long hpte_group, |
| unsigned long va, unsigned long pa, |
| unsigned long rflags, unsigned long vflags, |
| int psize) |
| { |
| unsigned long lpar_rc; |
| unsigned long slot; |
| unsigned long hpte_v, hpte_r; |
| unsigned long flags; |
| |
| /* same as iseries */ |
| if (vflags & HPTE_V_SECONDARY) |
| return -1; |
| |
| if (!(vflags & HPTE_V_BOLTED)) |
| DBG_LOW("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) | vflags | HPTE_V_VALID; |
| hpte_r = hpte_encode_r(pa, psize) | rflags; |
| |
| if (!(vflags & HPTE_V_BOLTED)) |
| DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); |
| |
| if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE)) |
| hpte_r &= ~_PAGE_COHERENT; |
| |
| spin_lock_irqsave(&beat_htab_lock, flags); |
| if ((lpar_rc = beat_read_mask(hpte_group)) == 0) { |
| if (!(vflags & HPTE_V_BOLTED)) |
| DBG_LOW(" full\n"); |
| spin_unlock_irqrestore(&beat_htab_lock, flags); |
| return -1; |
| } |
| |
| lpar_rc = beat_insert_htab_entry(0, hpte_group, lpar_rc << 48, |
| hpte_v, hpte_r, &slot); |
| spin_unlock_irqrestore(&beat_htab_lock, flags); |
| |
| /* |
| * 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 != 0)) { |
| if (!(vflags & HPTE_V_BOLTED)) |
| DBG_LOW(" lpar err %lx\n", lpar_rc); |
| return -2; |
| } |
| if (!(vflags & HPTE_V_BOLTED)) |
| DBG_LOW(" -> slot: %lx\n", slot); |
| |
| /* We have to pass down the secondary bucket bit here as well */ |
| return (slot ^ hpte_group) & 15; |
| } |
| |
| static long beat_lpar_hpte_remove(unsigned long hpte_group) |
| { |
| DBG_LOW("hpte_remove(group=%lx)\n", hpte_group); |
| return -1; |
| } |
| |
| static unsigned long beat_lpar_hpte_getword0(unsigned long slot) |
| { |
| unsigned long dword0, dword[5]; |
| unsigned long lpar_rc; |
| |
| lpar_rc = beat_read_htab_entries(0, slot & ~3UL, dword); |
| |
| dword0 = dword[slot&3]; |
| |
| BUG_ON(lpar_rc != 0); |
| |
| return dword0; |
| } |
| |
| static void beat_lpar_hptab_clear(void) |
| { |
| unsigned long size_bytes = 1UL << ppc64_pft_size; |
| unsigned long hpte_count = size_bytes >> 4; |
| int i; |
| unsigned long dummy0, dummy1; |
| |
| /* TODO: Use bulk call */ |
| for (i = 0; i < hpte_count; i++) |
| beat_write_htab_entry(0, i, 0, 0, -1UL, -1UL, &dummy0, &dummy1); |
| } |
| |
| /* |
| * 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 beat_lpar_hpte_updatepp(unsigned long slot, |
| unsigned long newpp, |
| unsigned long va, |
| int psize, int local) |
| { |
| unsigned long lpar_rc; |
| unsigned long dummy0, dummy1, want_v; |
| unsigned long flags; |
| |
| want_v = hpte_encode_v(va, psize); |
| |
| DBG_LOW(" update: " |
| "avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ", |
| want_v & HPTE_V_AVPN, slot, psize, newpp); |
| |
| spin_lock_irqsave(&beat_htab_lock, flags); |
| dummy0 = beat_lpar_hpte_getword0(slot); |
| if ((dummy0 & ~0x7FUL) != (want_v & ~0x7FUL)) { |
| DBG_LOW("not found !\n"); |
| spin_unlock_irqrestore(&beat_htab_lock, flags); |
| return -1; |
| } |
| |
| lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7, &dummy0, |
| &dummy1); |
| spin_unlock_irqrestore(&beat_htab_lock, flags); |
| if (lpar_rc != 0 || dummy0 == 0) { |
| DBG_LOW("not found !\n"); |
| return -1; |
| } |
| |
| DBG_LOW("ok %lx %lx\n", dummy0, dummy1); |
| |
| BUG_ON(lpar_rc != 0); |
| |
| return 0; |
| } |
| |
| static long beat_lpar_hpte_find(unsigned long va, int psize) |
| { |
| unsigned long hash; |
| unsigned long i, j; |
| long slot; |
| unsigned long want_v, hpte_v; |
| |
| hash = hpt_hash(va, mmu_psize_defs[psize].shift); |
| want_v = hpte_encode_v(va, psize); |
| |
| for (j = 0; j < 2; j++) { |
| slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
| for (i = 0; i < HPTES_PER_GROUP; i++) { |
| hpte_v = beat_lpar_hpte_getword0(slot); |
| |
| if (HPTE_V_COMPARE(hpte_v, want_v) |
| && (hpte_v & HPTE_V_VALID) |
| && (!!(hpte_v & HPTE_V_SECONDARY) == j)) { |
| /* HPTE matches */ |
| if (j) |
| slot = -slot; |
| return slot; |
| } |
| ++slot; |
| } |
| hash = ~hash; |
| } |
| |
| return -1; |
| } |
| |
| static void beat_lpar_hpte_updateboltedpp(unsigned long newpp, |
| unsigned long ea, |
| int psize) |
| { |
| unsigned long lpar_rc, slot, vsid, va, dummy0, dummy1; |
| unsigned long flags; |
| |
| vsid = get_kernel_vsid(ea); |
| va = (vsid << 28) | (ea & 0x0fffffff); |
| |
| spin_lock_irqsave(&beat_htab_lock, flags); |
| slot = beat_lpar_hpte_find(va, psize); |
| BUG_ON(slot == -1); |
| |
| lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7, |
| &dummy0, &dummy1); |
| spin_unlock_irqrestore(&beat_htab_lock, flags); |
| |
| BUG_ON(lpar_rc != 0); |
| } |
| |
| static void beat_lpar_hpte_invalidate(unsigned long slot, unsigned long va, |
| int psize, int local) |
| { |
| unsigned long want_v; |
| unsigned long lpar_rc; |
| unsigned long dummy1, dummy2; |
| unsigned long flags; |
| |
| DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n", |
| slot, va, psize, local); |
| want_v = hpte_encode_v(va, psize); |
| |
| spin_lock_irqsave(&beat_htab_lock, flags); |
| dummy1 = beat_lpar_hpte_getword0(slot); |
| |
| if ((dummy1 & ~0x7FUL) != (want_v & ~0x7FUL)) { |
| DBG_LOW("not found !\n"); |
| spin_unlock_irqrestore(&beat_htab_lock, flags); |
| return; |
| } |
| |
| lpar_rc = beat_write_htab_entry(0, slot, 0, 0, HPTE_V_VALID, 0, |
| &dummy1, &dummy2); |
| spin_unlock_irqrestore(&beat_htab_lock, flags); |
| |
| BUG_ON(lpar_rc != 0); |
| } |
| |
| void __init hpte_init_beat(void) |
| { |
| ppc_md.hpte_invalidate = beat_lpar_hpte_invalidate; |
| ppc_md.hpte_updatepp = beat_lpar_hpte_updatepp; |
| ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp; |
| ppc_md.hpte_insert = beat_lpar_hpte_insert; |
| ppc_md.hpte_remove = beat_lpar_hpte_remove; |
| ppc_md.hpte_clear_all = beat_lpar_hptab_clear; |
| } |