1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
243 lines
5.7 KiB
C
243 lines
5.7 KiB
C
/*
|
|
* iSeries hashtable management.
|
|
* Derived from pSeries_htab.c
|
|
*
|
|
* SMP scalability work:
|
|
* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, 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 <asm/machdep.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/iSeries/HvCallHpt.h>
|
|
#include <asm/abs_addr.h>
|
|
#include <linux/spinlock.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 prpn, int secondary,
|
|
unsigned long hpteflags, int bolted, int large)
|
|
{
|
|
long slot;
|
|
HPTE lhpte;
|
|
|
|
/*
|
|
* 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 (secondary)
|
|
return -1;
|
|
|
|
iSeries_hlock(hpte_group);
|
|
|
|
slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
|
|
BUG_ON(lhpte.dw0.dw0.v);
|
|
|
|
if (slot == -1) { /* No available entry found in either group */
|
|
iSeries_hunlock(hpte_group);
|
|
return -1;
|
|
}
|
|
|
|
if (slot < 0) { /* MSB set means secondary group */
|
|
secondary = 1;
|
|
slot &= 0x7fffffffffffffff;
|
|
}
|
|
|
|
lhpte.dw1.dword1 = 0;
|
|
lhpte.dw1.dw1.rpn = physRpn_to_absRpn(prpn);
|
|
lhpte.dw1.flags.flags = hpteflags;
|
|
|
|
lhpte.dw0.dword0 = 0;
|
|
lhpte.dw0.dw0.avpn = va >> 23;
|
|
lhpte.dw0.dw0.h = secondary;
|
|
lhpte.dw0.dw0.bolted = bolted;
|
|
lhpte.dw0.dw0.v = 1;
|
|
|
|
/* 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)
|
|
{
|
|
unsigned long dword0;
|
|
HPTE hpte;
|
|
|
|
HvCallHpt_get(&hpte, slot);
|
|
dword0 = hpte.dw0.dword0;
|
|
|
|
return dword0;
|
|
}
|
|
|
|
static long iSeries_hpte_remove(unsigned long hpte_group)
|
|
{
|
|
unsigned long slot_offset;
|
|
int i;
|
|
HPTE lhpte;
|
|
|
|
/* Pick a random slot to start at */
|
|
slot_offset = mftb() & 0x7;
|
|
|
|
iSeries_hlock(hpte_group);
|
|
|
|
for (i = 0; i < HPTES_PER_GROUP; i++) {
|
|
lhpte.dw0.dword0 =
|
|
iSeries_hpte_getword0(hpte_group + slot_offset);
|
|
|
|
if (!lhpte.dw0.dw0.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 large, int local)
|
|
{
|
|
HPTE hpte;
|
|
unsigned long avpn = va >> 23;
|
|
|
|
iSeries_hlock(slot);
|
|
|
|
HvCallHpt_get(&hpte, slot);
|
|
if ((hpte.dw0.dw0.avpn == avpn) && (hpte.dw0.dw0.v)) {
|
|
/*
|
|
* 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)
|
|
{
|
|
HPTE 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.dw0.dw0.v) {
|
|
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)
|
|
{
|
|
unsigned long vsid,va,vpn;
|
|
long slot;
|
|
|
|
vsid = get_kernel_vsid(ea);
|
|
va = (vsid << 28) | (ea & 0x0fffffff);
|
|
vpn = va >> 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 large, int local)
|
|
{
|
|
HPTE lhpte;
|
|
unsigned long avpn = va >> 23;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
|
|
iSeries_hlock(slot);
|
|
|
|
lhpte.dw0.dword0 = iSeries_hpte_getword0(slot);
|
|
|
|
if ((lhpte.dw0.dw0.avpn == avpn) && lhpte.dw0.dw0.v)
|
|
HvCallHpt_invalidateSetSwBitsGet(slot, 0, 0);
|
|
|
|
iSeries_hunlock(slot);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void 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;
|
|
|
|
htab_finish_init();
|
|
}
|