hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Richard Kuo 2011-10-31 18:52:00 -05:00 committed by Linus Torvalds
parent 2d3cbc7804
commit 5df87c1556
3 changed files with 190 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
arch/hexagon/include/asm/tlb.h Normal file
View File

@ -0,0 +1,39 @@
/*
* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#ifndef _ASM_TLB_H
#define _ASM_TLB_H
#include <linux/pagemap.h>
#include <asm/tlbflush.h>
/*
* We don't need any special per-pte or per-vma handling...
*/
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
/*
* .. because we flush the whole mm when it fills up
*/
#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
#include <asm-generic/tlb.h>
#endif

58
arch/hexagon/include/asm/tlbflush.h Normal file
View File

@ -0,0 +1,58 @@
/*
* TLB flush support for Hexagon
*
* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#ifndef _ASM_TLBFLUSH_H
#define _ASM_TLBFLUSH_H
#include <linux/mm.h>
#include <asm/processor.h>
/*
* TLB flushing -- in "SMP", these routines get defined to be the
* ones from smp.c, else they are some local flavors.
*/
/*
* These functions are commonly macros, but in the interests of
* VM vs. native implementation and code size, we simply declare
* the function prototypes here.
*/
extern void tlb_flush_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
extern void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
extern void flush_tlb_one(unsigned long);
/*
* "This is called in munmap when we have freed up some page-table pages.
* We don't need to do anything here..."
*
* The VM kernel doesn't walk page tables, and they are passed to the VMM
* by logical address. There doesn't seem to be any possibility that they
* could be referenced by the VM kernel based on a stale mapping, since
* they would only be located by consulting the mm structure, and they
* will have been purged from that structure by the munmap. Seems like
* a noop on HVM as well.
*/
#define flush_tlb_pgtables(mm, start, end)
#endif

93
arch/hexagon/mm/vm_tlb.c Normal file
View File

@ -0,0 +1,93 @@
/*
* Hexagon Virtual Machine TLB functions
*
* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* The Hexagon Virtual Machine conceals the real workings of
* the TLB, but there are one or two functions that need to
* be instantiated for it, differently from a native build.
*/
#include <linux/mm.h>
#include <asm/page.h>
#include <asm/hexagon_vm.h>
/*
* Initial VM implementation has only one map active at a time, with
* TLB purgings on changes. So either we're nuking the current map,
* or it's a no-op. This operation is messy on true SMPs where other
* processors must be induced to flush the copies in their local TLBs,
* but Hexagon thread-based virtual processors share the same MMU.
*/
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
if (mm->context.ptbase == current->active_mm->context.ptbase)
__vmclrmap((void *)start, end - start);
}
/*
* Flush a page from the kernel virtual map - used by highmem
*/
void flush_tlb_one(unsigned long vaddr)
{
__vmclrmap((void *)vaddr, PAGE_SIZE);
}
/*
* Flush all TLBs across all CPUs, virtual or real.
* A single Hexagon core has 6 thread contexts but
* only one TLB.
*/
void tlb_flush_all(void)
{
/* should probably use that fixaddr end or whateve label */
__vmclrmap(0, 0xffff0000);
}
/*
* Flush TLB entries associated with a given mm_struct mapping.
*/
void flush_tlb_mm(struct mm_struct *mm)
{
/* Current Virtual Machine has only one map active at a time */
if (current->active_mm->context.ptbase == mm->context.ptbase)
tlb_flush_all();
}
/*
* Flush TLB state associated with a page of a vma.
*/
void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
{
struct mm_struct *mm = vma->vm_mm;
if (mm->context.ptbase == current->active_mm->context.ptbase)
__vmclrmap((void *)vaddr, PAGE_SIZE);
}
/*
* Flush TLB entries associated with a kernel address range.
* Like flush range, but without the check on the vma->vm_mm.
*/
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
__vmclrmap((void *)start, end - start);
}