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![Paul Gortmaker](/assets/img/avatar_default.png)
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0
("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/score uses of the __cpuinit macros from
all C files. Currently score does not have any __CPUINIT used in
assembly files.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
251 lines
5.3 KiB
C
251 lines
5.3 KiB
C
/*
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* arch/score/mm/tlb-score.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Lennox Wu <lennox.wu@sunplusct.com>
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* Chen Liqin <liqin.chen@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <asm/irq.h>
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#include <asm/mmu_context.h>
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#include <asm/tlb.h>
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#define TLBSIZE 32
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unsigned long asid_cache = ASID_FIRST_VERSION;
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EXPORT_SYMBOL(asid_cache);
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void local_flush_tlb_all(void)
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{
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unsigned long flags;
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unsigned long old_ASID;
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int entry;
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local_irq_save(flags);
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old_ASID = pevn_get() & ASID_MASK;
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pectx_set(0); /* invalid */
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entry = tlblock_get(); /* skip locked entries*/
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for (; entry < TLBSIZE; entry++) {
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tlbpt_set(entry);
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pevn_set(KSEG1);
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barrier();
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tlb_write_indexed();
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}
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pevn_set(old_ASID);
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local_irq_restore(flags);
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}
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/*
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* If mm is currently active_mm, we can't really drop it. Instead,
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* we will get a new one for it.
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*/
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static inline void
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drop_mmu_context(struct mm_struct *mm)
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{
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unsigned long flags;
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local_irq_save(flags);
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get_new_mmu_context(mm);
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pevn_set(mm->context & ASID_MASK);
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local_irq_restore(flags);
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}
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void local_flush_tlb_mm(struct mm_struct *mm)
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{
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if (mm->context != 0)
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drop_mmu_context(mm);
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}
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void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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struct mm_struct *mm = vma->vm_mm;
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unsigned long vma_mm_context = mm->context;
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if (mm->context != 0) {
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unsigned long flags;
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int size;
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local_irq_save(flags);
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size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
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if (size <= TLBSIZE) {
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int oldpid = pevn_get() & ASID_MASK;
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int newpid = vma_mm_context & ASID_MASK;
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start &= PAGE_MASK;
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end += (PAGE_SIZE - 1);
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end &= PAGE_MASK;
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while (start < end) {
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int idx;
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pevn_set(start | newpid);
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start += PAGE_SIZE;
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barrier();
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tlb_probe();
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idx = tlbpt_get();
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pectx_set(0);
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pevn_set(KSEG1);
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if (idx < 0)
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continue;
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tlb_write_indexed();
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}
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pevn_set(oldpid);
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} else {
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/* Bigger than TLBSIZE, get new ASID directly */
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get_new_mmu_context(mm);
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if (mm == current->active_mm)
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pevn_set(vma_mm_context & ASID_MASK);
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}
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local_irq_restore(flags);
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}
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}
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void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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unsigned long flags;
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int size;
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local_irq_save(flags);
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size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
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if (size <= TLBSIZE) {
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int pid = pevn_get();
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start &= PAGE_MASK;
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end += PAGE_SIZE - 1;
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end &= PAGE_MASK;
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while (start < end) {
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long idx;
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pevn_set(start);
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start += PAGE_SIZE;
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tlb_probe();
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idx = tlbpt_get();
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if (idx < 0)
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continue;
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pectx_set(0);
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pevn_set(KSEG1);
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barrier();
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tlb_write_indexed();
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}
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pevn_set(pid);
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} else {
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local_flush_tlb_all();
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}
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local_irq_restore(flags);
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}
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void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
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{
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if (vma && vma->vm_mm->context != 0) {
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unsigned long flags;
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int oldpid, newpid, idx;
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unsigned long vma_ASID = vma->vm_mm->context;
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newpid = vma_ASID & ASID_MASK;
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page &= PAGE_MASK;
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local_irq_save(flags);
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oldpid = pevn_get() & ASID_MASK;
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pevn_set(page | newpid);
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barrier();
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tlb_probe();
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idx = tlbpt_get();
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pectx_set(0);
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pevn_set(KSEG1);
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if (idx < 0) /* p_bit(31) - 1: miss, 0: hit*/
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goto finish;
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barrier();
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tlb_write_indexed();
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finish:
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pevn_set(oldpid);
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local_irq_restore(flags);
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}
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}
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/*
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* This one is only used for pages with the global bit set so we don't care
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* much about the ASID.
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*/
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void local_flush_tlb_one(unsigned long page)
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{
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unsigned long flags;
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int oldpid, idx;
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local_irq_save(flags);
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oldpid = pevn_get();
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page &= (PAGE_MASK << 1);
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pevn_set(page);
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barrier();
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tlb_probe();
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idx = tlbpt_get();
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pectx_set(0);
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if (idx >= 0) {
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/* Make sure all entries differ. */
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pevn_set(KSEG1);
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barrier();
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tlb_write_indexed();
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}
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pevn_set(oldpid);
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local_irq_restore(flags);
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}
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void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
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{
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unsigned long flags;
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int idx, pid;
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/*
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* Handle debugger faulting in for debugee.
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*/
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if (current->active_mm != vma->vm_mm)
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return;
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pid = pevn_get() & ASID_MASK;
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local_irq_save(flags);
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address &= PAGE_MASK;
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pevn_set(address | pid);
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barrier();
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tlb_probe();
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idx = tlbpt_get();
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pectx_set(pte_val(pte));
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pevn_set(address | pid);
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if (idx < 0)
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tlb_write_random();
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else
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tlb_write_indexed();
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pevn_set(pid);
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local_irq_restore(flags);
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}
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void tlb_init(void)
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{
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tlblock_set(0);
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local_flush_tlb_all();
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memcpy((void *)(EXCEPTION_VECTOR_BASE_ADDR + 0x100),
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&score7_FTLB_refill_Handler, 0xFC);
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flush_icache_range(EXCEPTION_VECTOR_BASE_ADDR + 0x100,
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EXCEPTION_VECTOR_BASE_ADDR + 0x1FC);
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}
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