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linux-pinenote/arch/powerpc/platforms/cell/beat_htab.c
Aneesh Kumar K.V db3d853490 powerpc/mm: handle hugepage size correctly when invalidating hpte entries 
If a hash bucket gets full, we "evict" a more/less random entry from it.
When we do that we don't invalidate the TLB (hpte_remove) because we assume
the old translation is still technically "valid". This implies that when
we are invalidating or updating pte, even if HPTE entry is not valid
we should do a tlb invalidate. With hugepages, we need to pass the correct
actual page size value for tlb invalidation.

This change update the patch 0608d69246
"powerpc/mm: Always invalidate tlb on hpte invalidate and update" to handle
transparent hugepages correctly.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-06-21 16:01:52 +10:00

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/*
* "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_RAW_SPINLOCK(beat_htab_lock);
static inline unsigned int beat_read_mask(unsigned hpte_group)
{
unsigned long rmask = 0;
u64 hpte_v[5];
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 vpn, unsigned long pa,
unsigned long rflags, unsigned long vflags,
int psize, int apsize, int ssize)
{
unsigned long lpar_rc;
u64 hpte_v, hpte_r, slot;
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(vpn, psize, apsize, MMU_SEGSIZE_256M) |
vflags | HPTE_V_VALID;
hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
if (rflags & _PAGE_NO_CACHE)
hpte_r &= ~_PAGE_COHERENT;
raw_spin_lock(&beat_htab_lock);
lpar_rc = beat_read_mask(hpte_group);
if (lpar_rc == 0) {
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW(" full\n");
raw_spin_unlock(&beat_htab_lock);
return -1;
}
lpar_rc = beat_insert_htab_entry(0, hpte_group, lpar_rc << 48,
hpte_v, hpte_r, &slot);
raw_spin_unlock(&beat_htab_lock);
/*
* 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;
unsigned long lpar_rc;
u64 dword[5];
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;
u64 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 vpn,
int psize, int apsize,
int ssize, int local)
{
unsigned long lpar_rc;
u64 dummy0, dummy1;
unsigned long want_v;
want_v = hpte_encode_avpn(vpn, psize, MMU_SEGSIZE_256M);
DBG_LOW(" update: "
"avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
want_v & HPTE_V_AVPN, slot, psize, newpp);
raw_spin_lock(&beat_htab_lock);
dummy0 = beat_lpar_hpte_getword0(slot);
if ((dummy0 & ~0x7FUL) != (want_v & ~0x7FUL)) {
DBG_LOW("not found !\n");
raw_spin_unlock(&beat_htab_lock);
return -1;
}
lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7, &dummy0,
&dummy1);
raw_spin_unlock(&beat_htab_lock);
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 vpn, int psize)
{
unsigned long hash;
unsigned long i, j;
long slot;
unsigned long want_v, hpte_v;
hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, MMU_SEGSIZE_256M);
want_v = hpte_encode_avpn(vpn, psize, MMU_SEGSIZE_256M);
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, int ssize)
{
unsigned long vpn;
unsigned long lpar_rc, slot, vsid;
u64 dummy0, dummy1;
vsid = get_kernel_vsid(ea, MMU_SEGSIZE_256M);
vpn = hpt_vpn(ea, vsid, MMU_SEGSIZE_256M);
raw_spin_lock(&beat_htab_lock);
slot = beat_lpar_hpte_find(vpn, psize);
BUG_ON(slot == -1);
lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7,
&dummy0, &dummy1);
raw_spin_unlock(&beat_htab_lock);
BUG_ON(lpar_rc != 0);
}
static void beat_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
int psize, int apsize,
int ssize, int local)
{
unsigned long want_v;
unsigned long lpar_rc;
u64 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_avpn(vpn, psize, MMU_SEGSIZE_256M);
raw_spin_lock_irqsave(&beat_htab_lock, flags);
dummy1 = beat_lpar_hpte_getword0(slot);
if ((dummy1 & ~0x7FUL) != (want_v & ~0x7FUL)) {
DBG_LOW("not found !\n");
raw_spin_unlock_irqrestore(&beat_htab_lock, flags);
return;
}
lpar_rc = beat_write_htab_entry(0, slot, 0, 0, HPTE_V_VALID, 0,
&dummy1, &dummy2);
raw_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;
}
static long beat_lpar_hpte_insert_v3(unsigned long hpte_group,
unsigned long vpn, unsigned long pa,
unsigned long rflags, unsigned long vflags,
int psize, int apsize, int ssize)
{
unsigned long lpar_rc;
u64 hpte_v, hpte_r, slot;
if (vflags & HPTE_V_SECONDARY)
return -1;
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW("hpte_insert(group=%lx, vpn=%016lx, pa=%016lx, "
"rflags=%lx, vflags=%lx, psize=%d)\n",
hpte_group, vpn, pa, rflags, vflags, psize);
hpte_v = hpte_encode_v(vpn, psize, apsize, MMU_SEGSIZE_256M) |
vflags | HPTE_V_VALID;
hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
if (rflags & _PAGE_NO_CACHE)
hpte_r &= ~_PAGE_COHERENT;
/* insert into not-volted entry */
lpar_rc = beat_insert_htab_entry3(0, hpte_group, hpte_v, hpte_r,
HPTE_V_BOLTED, 0, &slot);
/*
* 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;
}
/*
* 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_v3(unsigned long slot,
unsigned long newpp,
unsigned long vpn,
int psize, int apsize,
int ssize, int local)
{
unsigned long lpar_rc;
unsigned long want_v;
unsigned long pss;
want_v = hpte_encode_avpn(vpn, psize, MMU_SEGSIZE_256M);
pss = (psize == MMU_PAGE_4K) ? -1UL : mmu_psize_defs[psize].penc[psize];
DBG_LOW(" update: "
"avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
want_v & HPTE_V_AVPN, slot, psize, newpp);
lpar_rc = beat_update_htab_permission3(0, slot, want_v, pss, 7, newpp);
if (lpar_rc == 0xfffffff7) {
DBG_LOW("not found !\n");
return -1;
}
DBG_LOW("ok\n");
BUG_ON(lpar_rc != 0);
return 0;
}
static void beat_lpar_hpte_invalidate_v3(unsigned long slot, unsigned long vpn,
int psize, int apsize,
int ssize, int local)
{
unsigned long want_v;
unsigned long lpar_rc;
unsigned long pss;
DBG_LOW(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
slot, vpn, psize, local);
want_v = hpte_encode_avpn(vpn, psize, MMU_SEGSIZE_256M);
pss = (psize == MMU_PAGE_4K) ? -1UL : mmu_psize_defs[psize].penc[psize];
lpar_rc = beat_invalidate_htab_entry3(0, slot, want_v, pss);
/* E_busy can be valid output: page may be already replaced */
BUG_ON(lpar_rc != 0 && lpar_rc != 0xfffffff7);
}
static int64_t _beat_lpar_hptab_clear_v3(void)
{
return beat_clear_htab3(0);
}
static void beat_lpar_hptab_clear_v3(void)
{
_beat_lpar_hptab_clear_v3();
}
void __init hpte_init_beat_v3(void)
{
if (_beat_lpar_hptab_clear_v3() == 0) {
ppc_md.hpte_invalidate = beat_lpar_hpte_invalidate_v3;
ppc_md.hpte_updatepp = beat_lpar_hpte_updatepp_v3;
ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
ppc_md.hpte_insert = beat_lpar_hpte_insert_v3;
ppc_md.hpte_remove = beat_lpar_hpte_remove;
ppc_md.hpte_clear_all = beat_lpar_hptab_clear_v3;
} else {
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;
}
}
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