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// SPDX-License-Identifier: GPL-2.0-only
/*
* PS3 pagetable management routines.
*
* Copyright (C) 2006 Sony Computer Entertainment Inc.
* Copyright 2006, 2007 Sony Corporation
*/
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/lv1call.h>
#include <asm/ps3fb.h>
#define PS3_VERBOSE_RESULT
#include "platform.h"
/**
* enum lpar_vas_id - id of LPAR virtual address space.
* @lpar_vas_id_current: Current selected virtual address space
*
* Identify the target LPAR address space.
*/
enum ps3_lpar_vas_id {
PS3_LPAR_VAS_ID_CURRENT = 0,
};
static DEFINE_SPINLOCK(ps3_htab_lock);
static long ps3_hpte_insert(unsigned long hpte_group, unsigned long vpn,
unsigned long pa, unsigned long rflags, unsigned long vflags,
int psize, int apsize, int ssize)
{
int result;
u64 hpte_v, hpte_r;
u64 inserted_index;
u64 evicted_v, evicted_r;
u64 hpte_v_array[4], hpte_rs;
unsigned long flags;
long ret = -1;
/*
* lv1_insert_htab_entry() will search for victim
* entry in both primary and secondary pte group
*/
vflags &= ~HPTE_V_SECONDARY;
hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
hpte_r = hpte_encode_r(ps3_mm_phys_to_lpar(pa), psize, apsize) | rflags;
spin_lock_irqsave(&ps3_htab_lock, flags);
/* talk hvc to replace entries BOLTED == 0 */
result = lv1_insert_htab_entry(PS3_LPAR_VAS_ID_CURRENT, hpte_group,
hpte_v, hpte_r,
HPTE_V_BOLTED, 0,
&inserted_index,
&evicted_v, &evicted_r);
if (result) {
/* all entries bolted !*/
pr_info("%s:result=%s vpn=%lx pa=%lx ix=%lx v=%llx r=%llx\n",
__func__, ps3_result(result), vpn, pa, hpte_group,
hpte_v, hpte_r);
BUG();
}
/*
* see if the entry is inserted into secondary pteg
*/
result = lv1_read_htab_entries(PS3_LPAR_VAS_ID_CURRENT,
inserted_index & ~0x3UL,
&hpte_v_array[0], &hpte_v_array[1],
&hpte_v_array[2], &hpte_v_array[3],
&hpte_rs);
BUG_ON(result);
if (hpte_v_array[inserted_index % 4] & HPTE_V_SECONDARY)
ret = (inserted_index & 7) | (1 << 3);
else
ret = inserted_index & 7;
spin_unlock_irqrestore(&ps3_htab_lock, flags);
return ret;
}
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 vpn, int psize, int apsize,
int ssize, unsigned long inv_flags)
{
int result;
u64 hpte_v, want_v, hpte_rs;
u64 hpte_v_array[4];
unsigned long flags;
long ret;
want_v = hpte_encode_avpn(vpn, psize, ssize);
spin_lock_irqsave(&ps3_htab_lock, flags);
result = lv1_read_htab_entries(PS3_LPAR_VAS_ID_CURRENT, slot & ~0x3UL,
&hpte_v_array[0], &hpte_v_array[1],
&hpte_v_array[2], &hpte_v_array[3],
&hpte_rs);
if (result) {
pr_info("%s: result=%s read vpn=%lx slot=%lx psize=%d\n",
__func__, ps3_result(result), vpn, slot, psize);
BUG();
}
hpte_v = hpte_v_array[slot % 4];
/*
* As lv1_read_htab_entries() does not give us the RPN, we can
* not synthesize the new hpte_r value here, and therefore can
* not update the hpte with lv1_insert_htab_entry(), so we
* instead invalidate it and ask the caller to update it via
* ps3_hpte_insert() by returning a -1 value.
*/
if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) {
/* not found */
ret = -1;
} else {
/* entry found, just invalidate it */
result = lv1_write_htab_entry(PS3_LPAR_VAS_ID_CURRENT,
slot, 0, 0);
ret = -1;
}
spin_unlock_irqrestore(&ps3_htab_lock, flags);
return ret;
}
static void ps3_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
int psize, int ssize)
{
panic("ps3_hpte_updateboltedpp() not implemented");
}
static void ps3_hpte_invalidate(unsigned long slot, unsigned long vpn,
int psize, int apsize, int ssize, int local)
{
unsigned long flags;
int result;
spin_lock_irqsave(&ps3_htab_lock, flags);
result = lv1_write_htab_entry(PS3_LPAR_VAS_ID_CURRENT, slot, 0, 0);
if (result) {
pr_info("%s: result=%s vpn=%lx slot=%lx psize=%d\n",
__func__, ps3_result(result), vpn, slot, psize);
BUG();
}
spin_unlock_irqrestore(&ps3_htab_lock, flags);
}
/* Called during kexec sequence with MMU off */
static notrace void ps3_hpte_clear(void)
{
unsigned long hpte_count = (1UL << ppc64_pft_size) >> 4;
u64 i;
for (i = 0; i < hpte_count; i++)
lv1_write_htab_entry(PS3_LPAR_VAS_ID_CURRENT, i, 0, 0);
ps3_mm_shutdown();
ps3_mm_vas_destroy();
}
void __init ps3_hpte_init(unsigned long htab_size)
{
mmu_hash_ops.hpte_invalidate = ps3_hpte_invalidate;
mmu_hash_ops.hpte_updatepp = ps3_hpte_updatepp;
mmu_hash_ops.hpte_updateboltedpp = ps3_hpte_updateboltedpp;
mmu_hash_ops.hpte_insert = ps3_hpte_insert;
mmu_hash_ops.hpte_remove = ps3_hpte_remove;
mmu_hash_ops.hpte_clear_all = ps3_hpte_clear;
ppc64_pft_size = __ilog2(htab_size);
}
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