/*
* PS3 pagetable management routines.
*
* Copyright (C) 2006 Sony Computer Entertainment Inc.
* Copyright 2006 Sony Corp.
*
* 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; version 2 of the License.
*
* 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
*/
#include <linux/kernel.h>
#include <asm/machdep.h>
#include <asm/lmb.h>
#include <asm/udbg.h>
#include <asm/ps3.h>
#include <asm/lv1call.h>
#include "platform.h"
#if defined(DEBUG)
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...) do{if(0)printk(fmt);}while(0)
#endif
static hpte_t *htab;
static unsigned long htab_addr;
static unsigned char *bolttab;
static unsigned char *inusetab;
static spinlock_t ps3_bolttab_lock = SPIN_LOCK_UNLOCKED;
#define debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g) \
_debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g, __func__, __LINE__)
static void _debug_dump_hpte(unsigned long pa, unsigned long va,
unsigned long group, unsigned long bitmap, hpte_t lhpte, int psize,
unsigned long slot, const char* func, int line)
{
DBG("%s:%d: pa = %lxh\n", func, line, pa);
DBG("%s:%d: lpar = %lxh\n", func, line,
ps3_mm_phys_to_lpar(pa));
DBG("%s:%d: va = %lxh\n", func, line, va);
DBG("%s:%d: group = %lxh\n", func, line, group);
DBG("%s:%d: bitmap = %lxh\n", func, line, bitmap);
DBG("%s:%d: hpte.v = %lxh\n", func, line, lhpte.v);
DBG("%s:%d: hpte.r = %lxh\n", func, line, lhpte.r);
DBG("%s:%d: psize = %xh\n", func, line, psize);
DBG("%s:%d: slot = %lxh\n", func, line, slot);
}
static long ps3_hpte_insert(unsigned long hpte_group, unsigned long va,
unsigned long pa, unsigned long rflags, unsigned long vflags, int psize)
{
unsigned long slot;
hpte_t lhpte;
int secondary = 0;
unsigned long result;
unsigned long bitmap;
unsigned long flags;
unsigned long p_pteg, s_pteg, b_index, b_mask, cb, ci;
vflags &= ~HPTE_V_SECONDARY; /* this bit is ignored */
lhpte.v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
lhpte.r = hpte_encode_r(ps3_mm_phys_to_lpar(pa), psize) | rflags;
p_pteg = hpte_group / HPTES_PER_GROUP;
s_pteg = ~p_pteg & htab_hash_mask;
spin_lock_irqsave(&ps3_bolttab_lock, flags);
BUG_ON(bolttab[p_pteg] == 0xff && bolttab[s_pteg] == 0xff);
bitmap = (inusetab[p_pteg] << 8) | inusetab[s_pteg];
if (bitmap == 0xffff) {
/*
* PTEG is full. Search for victim.
*/
bitmap &= ~((bolttab[p_pteg] << 8) | bolttab[s_pteg]);
do {
ci = mftb() & 15;
cb = 0x8000UL >> ci;
} while ((cb & bitmap) == 0);
} else {
/*
* search free slot in hardware order
* [primary] 0, 2, 4, 6, 1, 3, 5, 7
* [secondary] 0, 2, 4, 6, 1, 3, 5, 7
*/
for (ci = 0; ci < HPTES_PER_GROUP; ci += 2) {
cb = 0x8000UL >> ci;
if ((cb & bitmap) == 0)
goto found;
}
for (ci = 1; ci < HPTES_PER_GROUP; ci += 2) {
cb = 0x8000UL >> ci;
if ((cb & bitmap) == 0)
goto found;
}
for (ci = HPTES_PER_GROUP; ci < HPTES_PER_GROUP*2; ci += 2) {
cb = 0x8000UL >> ci;
if ((cb & bitmap) == 0)
goto found;
}
for (ci = HPTES_PER_GROUP+1; ci < HPTES_PER_GROUP*2; ci += 2) {
cb = 0x8000UL >> ci;
if ((cb & bitmap) == 0)
goto found;
}
}
found:
if (ci < HPTES_PER_GROUP) {
slot = p_pteg * HPTES_PER_GROUP + ci;
} else {
slot = s_pteg * HPTES_PER_GROUP + (ci & 7);
/* lhpte.dw0.dw0.h = 1; */
vflags |= HPTE_V_SECONDARY;
lhpte.v |= HPTE_V_SECONDARY;
}
result = lv1_write_htab_entry(0, slot, lhpte.v, lhpte.r);
if (result) {
debug_dump_hpte(pa, va, hpte_group, bitmap, lhpte, psize, slot);
BUG();
}
/*
* If used slot is not in primary HPTE group,
* the slot should be in secondary HPTE group.
*/
if ((hpte_group ^ slot) & ~(HPTES_PER_GROUP - 1)) {
secondary = 1;
b_index = s_pteg;
} else {
secondary = 0;
b_index = p_pteg;
}
b_mask = (lhpte.v & HPTE_V_BOLTED) ? 1 << 7 : 0 << 7;
bolttab[b_index] |= b_mask >> (slot & 7);
b_mask = 1 << 7;
inusetab[b_index] |= b_mask >> (slot & 7);
spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
return (slot & 7) | (secondary << 3);
}
static long ps3_hpte_remove(unsigned long hpte_group)
{
panic("ps3_hpte_remove() not implemented");
return 0;
}
static long ps3_hpte_updatepp(unsigned long slot, unsigned long newpp,
unsigned long va, int psize, int local)
{
unsigned long flags;
unsigned long result;
unsigned long pteg, bit;
unsigned long hpte_v, want_v;
want_v = hpte_encode_v(va, psize);
spin_lock_irqsave(&ps3_bolttab_lock, flags);
hpte_v = htab[slot].v;
if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) {
spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
/* ps3_hpte_insert() will be used to update PTE */
return -1;
}
result = lv1_write_htab_entry(0, slot, 0, 0);
if (result) {
DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
__func__, va, slot, psize, result, result);
BUG();
}
pteg = slot / HPTES_PER_GROUP;
bit = slot % HPTES_PER_GROUP;
inusetab[pteg] &= ~(0x80 >> bit);
spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
/* ps3_hpte_insert() will be used to update PTE */
return -1;
}
static void ps3_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
int psize)
{
panic("ps3_hpte_updateboltedpp() not implemented");
}
static void ps3_hpte_invalidate(unsigned long slot, unsigned long va,
int psize, int local)
{
unsigned long flags;
unsigned long result;
unsigned long pteg, bit;
spin_lock_irqsave(&ps3_bolttab_lock, flags);
result = lv1_write_htab_entry(0, slot, 0, 0);
if (result) {
DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
__func__, va, slot, psize, result, result);
BUG();
}
pteg = slot / HPTES_PER_GROUP;
bit = slot % HPTES_PER_GROUP;
inusetab[pteg] &= ~(0x80 >> bit);
spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
}
static void ps3_hpte_clear(void)
{
lv1_unmap_htab(htab_addr);
}
void __init ps3_hpte_init(unsigned long htab_size)
{
long bitmap_size;
DBG(" -> %s:%d\n", __func__, __LINE__);
ppc_md.hpte_invalidate = ps3_hpte_invalidate;
ppc_md.hpte_updatepp = ps3_hpte_updatepp;
ppc_md.hpte_updateboltedpp = ps3_hpte_updateboltedpp;
ppc_md.hpte_insert = ps3_hpte_insert;
ppc_md.hpte_remove = ps3_hpte_remove;
ppc_md.hpte_clear_all = ps3_hpte_clear;
ppc64_pft_size = __ilog2(htab_size);
bitmap_size = htab_size / sizeof(hpte_t) / 8;
bolttab = __va(lmb_alloc(bitmap_size, 1));
inusetab = __va(lmb_alloc(bitmap_size, 1));
memset(bolttab, 0, bitmap_size);
memset(inusetab, 0, bitmap_size);
DBG(" <- %s:%d\n", __func__, __LINE__);
}
void __init ps3_map_htab(void)
{
long result;
unsigned long htab_size = (1UL << ppc64_pft_size);
result = lv1_map_htab(0, &htab_addr);
htab = (hpte_t *)__ioremap(htab_addr, htab_size, PAGE_READONLY_X);
DBG("%s:%d: lpar %016lxh, virt %016lxh\n", __func__, __LINE__,
htab_addr, (unsigned long)htab);
}
