tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Hexagon: Implement basic TLB management routines for Hexagon.
Mostly all stubs, as the TLB is managed by the hypervisor.
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
authored by
Richard Kuo
and committed by
Linus Torvalds
5df87c15
2d3cbc78
+190
+39
arch/hexagon/include/asm/tlb.h
+39
arch/hexagon/include/asm/tlb.h
···
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/*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_TLB_H
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#define _ASM_TLB_H
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#include <linux/pagemap.h>
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#include <asm/tlbflush.h>
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/*
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* We don't need any special per-pte or per-vma handling...
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*/
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#define tlb_start_vma(tlb, vma) do { } while (0)
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#define tlb_end_vma(tlb, vma) do { } while (0)
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#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
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/*
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* .. because we flush the whole mm when it fills up
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*/
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#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
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#include <asm-generic/tlb.h>
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#endif
+58
arch/hexagon/include/asm/tlbflush.h
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arch/hexagon/include/asm/tlbflush.h
···
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/*
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* TLB flush support for Hexagon
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*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_TLBFLUSH_H
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#define _ASM_TLBFLUSH_H
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#include <linux/mm.h>
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#include <asm/processor.h>
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/*
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* TLB flushing -- in "SMP", these routines get defined to be the
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* ones from smp.c, else they are some local flavors.
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*/
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/*
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* These functions are commonly macros, but in the interests of
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* VM vs. native implementation and code size, we simply declare
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* the function prototypes here.
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*/
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extern void tlb_flush_all(void);
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extern void flush_tlb_mm(struct mm_struct *mm);
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extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
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extern void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
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extern void flush_tlb_one(unsigned long);
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/*
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* "This is called in munmap when we have freed up some page-table pages.
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* We don't need to do anything here..."
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*
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* The VM kernel doesn't walk page tables, and they are passed to the VMM
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* by logical address. There doesn't seem to be any possibility that they
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* could be referenced by the VM kernel based on a stale mapping, since
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* they would only be located by consulting the mm structure, and they
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* will have been purged from that structure by the munmap. Seems like
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* a noop on HVM as well.
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*/
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#define flush_tlb_pgtables(mm, start, end)
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#endif
+93
arch/hexagon/mm/vm_tlb.c
+93
arch/hexagon/mm/vm_tlb.c
···
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/*
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* Hexagon Virtual Machine TLB functions
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*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/*
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* The Hexagon Virtual Machine conceals the real workings of
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* the TLB, but there are one or two functions that need to
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* be instantiated for it, differently from a native build.
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*/
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#include <linux/mm.h>
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#include <asm/page.h>
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#include <asm/hexagon_vm.h>
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/*
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* Initial VM implementation has only one map active at a time, with
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* TLB purgings on changes. So either we're nuking the current map,
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* or it's a no-op. This operation is messy on true SMPs where other
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* processors must be induced to flush the copies in their local TLBs,
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* but Hexagon thread-based virtual processors share the same MMU.
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*/
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void 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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if (mm->context.ptbase == current->active_mm->context.ptbase)
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__vmclrmap((void *)start, end - start);
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}
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/*
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* Flush a page from the kernel virtual map - used by highmem
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*/
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void flush_tlb_one(unsigned long vaddr)
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{
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__vmclrmap((void *)vaddr, PAGE_SIZE);
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}
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/*
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* Flush all TLBs across all CPUs, virtual or real.
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* A single Hexagon core has 6 thread contexts but
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* only one TLB.
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*/
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void tlb_flush_all(void)
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{
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/* should probably use that fixaddr end or whateve label */
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__vmclrmap(0, 0xffff0000);
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}
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/*
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* Flush TLB entries associated with a given mm_struct mapping.
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*/
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void flush_tlb_mm(struct mm_struct *mm)
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{
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/* Current Virtual Machine has only one map active at a time */
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if (current->active_mm->context.ptbase == mm->context.ptbase)
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tlb_flush_all();
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}
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/*
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* Flush TLB state associated with a page of a vma.
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*/
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
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{
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struct mm_struct *mm = vma->vm_mm;
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if (mm->context.ptbase == current->active_mm->context.ptbase)
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__vmclrmap((void *)vaddr, PAGE_SIZE);
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}
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/*
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* Flush TLB entries associated with a kernel address range.
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* Like flush range, but without the check on the vma->vm_mm.
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*/
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void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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__vmclrmap((void *)start, end - start);
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}