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/*
* MMU context allocation for 64-bit kernels.
*
* Copyright (C) 2004 Anton Blanchard, IBM Corp. <anton@samba.org>
*
* 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 <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/idr.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#include "icswx.h"
static DEFINE_SPINLOCK(mmu_context_lock);
static DEFINE_IDA(mmu_context_ida);
static int alloc_context_id(int min_id, int max_id)
{
int index, err;
again:
if (!ida_pre_get(&mmu_context_ida, GFP_KERNEL))
return -ENOMEM;
spin_lock(&mmu_context_lock);
err = ida_get_new_above(&mmu_context_ida, min_id, &index);
spin_unlock(&mmu_context_lock);
if (err == -EAGAIN)
goto again;
else if (err)
return err;
if (index > max_id) {
spin_lock(&mmu_context_lock);
ida_remove(&mmu_context_ida, index);
spin_unlock(&mmu_context_lock);
return -ENOMEM;
}
return index;
}
void hash__reserve_context_id(int id)
{
int rc, result = 0;
do {
if (!ida_pre_get(&mmu_context_ida, GFP_KERNEL))
break;
spin_lock(&mmu_context_lock);
rc = ida_get_new_above(&mmu_context_ida, id, &result);
spin_unlock(&mmu_context_lock);
} while (rc == -EAGAIN);
WARN(result != id, "mmu: Failed to reserve context id %d (rc %d)\n", id, result);
}
int hash__alloc_context_id(void)
{
unsigned long max;
if (mmu_has_feature(MMU_FTR_68_BIT_VA))
max = MAX_USER_CONTEXT;
else
max = MAX_USER_CONTEXT_65BIT_VA;
return alloc_context_id(MIN_USER_CONTEXT, max);
}
EXPORT_SYMBOL_GPL(hash__alloc_context_id);
static int hash__init_new_context(struct mm_struct *mm)
{
int index;
index = hash__alloc_context_id();
if (index < 0)
return index;
/*
* We do switch_slb() early in fork, even before we setup the
* mm->context.addr_limit. Default to max task size so that we copy the
* default values to paca which will help us to handle slb miss early.
*/
mm->context.addr_limit = DEFAULT_MAP_WINDOW_USER64;
/*
* The old code would re-promote on fork, we don't do that when using
* slices as it could cause problem promoting slices that have been
* forced down to 4K.
*
* For book3s we have MMU_NO_CONTEXT set to be ~0. Hence check
* explicitly against context.id == 0. This ensures that we properly
* initialize context slice details for newly allocated mm's (which will
* have id == 0) and don't alter context slice inherited via fork (which
* will have id != 0).
*
* We should not be calling init_new_context() on init_mm. Hence a
* check against 0 is OK.
*/
if (mm->context.id == 0)
slice_set_user_psize(mm, mmu_virtual_psize);
subpage_prot_init_new_context(mm);
return index;
}
static int radix__init_new_context(struct mm_struct *mm)
{
unsigned long rts_field;
int index;
index = alloc_context_id(1, PRTB_ENTRIES - 1);
if (index < 0)
return index;
/*
* set the process table entry,
*/
rts_field = radix__get_tree_size();
process_tb[index].prtb0 = cpu_to_be64(rts_field | __pa(mm->pgd) | RADIX_PGD_INDEX_SIZE);
mm->context.npu_context = NULL;
return index;
}
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
int index;
if (radix_enabled())
index = radix__init_new_context(mm);
else
index = hash__init_new_context(mm);
if (index < 0)
return index;
mm->context.id = index;
#ifdef CONFIG_PPC_ICSWX
mm->context.cop_lockp = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
if (!mm->context.cop_lockp) {
__destroy_context(index);
subpage_prot_free(mm);
mm->context.id = MMU_NO_CONTEXT;
return -ENOMEM;
}
spin_lock_init(mm->context.cop_lockp);
#endif /* CONFIG_PPC_ICSWX */
#ifdef CONFIG_PPC_64K_PAGES
mm->context.pte_frag = NULL;
#endif
#ifdef CONFIG_SPAPR_TCE_IOMMU
mm_iommu_init(mm);
#endif
return 0;
}
void __destroy_context(int context_id)
{
spin_lock(&mmu_context_lock);
ida_remove(&mmu_context_ida, context_id);
spin_unlock(&mmu_context_lock);
}
EXPORT_SYMBOL_GPL(__destroy_context);
#ifdef CONFIG_PPC_64K_PAGES
static void destroy_pagetable_page(struct mm_struct *mm)
{
int count;
void *pte_frag;
struct page *page;
pte_frag = mm->context.pte_frag;
if (!pte_frag)
return;
page = virt_to_page(pte_frag);
/* drop all the pending references */
count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
/* We allow PTE_FRAG_NR fragments from a PTE page */
if (page_ref_sub_and_test(page, PTE_FRAG_NR - count)) {
pgtable_page_dtor(page);
free_hot_cold_page(page, 0);
}
}
#else
static inline void destroy_pagetable_page(struct mm_struct *mm)
{
return;
}
#endif
void destroy_context(struct mm_struct *mm)
{
#ifdef CONFIG_SPAPR_TCE_IOMMU
WARN_ON_ONCE(!list_empty(&mm->context.iommu_group_mem_list));
#endif
#ifdef CONFIG_PPC_ICSWX
drop_cop(mm->context.acop, mm);
kfree(mm->context.cop_lockp);
mm->context.cop_lockp = NULL;
#endif /* CONFIG_PPC_ICSWX */
if (radix_enabled())
process_tb[mm->context.id].prtb1 = 0;
else
subpage_prot_free(mm);
destroy_pagetable_page(mm);
__destroy_context(mm->context.id);
mm->context.id = MMU_NO_CONTEXT;
}
#ifdef CONFIG_PPC_RADIX_MMU
void radix__switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
{
asm volatile("isync": : :"memory");
mtspr(SPRN_PID, next->context.id);
asm volatile("isync \n"
PPC_SLBIA(0x7)
: : :"memory");
}
#endif
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