mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 11:51:27 +00:00
abe3265a6d
We had been doing an automatic full eviction of the L1 I$ everywhere whenever we did a kernel-space TLB flush. It turns out this isn't necessary, since all the callers already handle doing a flush if necessary. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*
|
|
* Copyright 2010 Tilera Corporation. 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
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* 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, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/cpumask.h>
|
|
#include <linux/module.h>
|
|
#include <linux/hugetlb.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/homecache.h>
|
|
#include <hv/hypervisor.h>
|
|
|
|
/* From tlbflush.h */
|
|
DEFINE_PER_CPU(int, current_asid);
|
|
int min_asid, max_asid;
|
|
|
|
/*
|
|
* Note that we flush the L1I (for VM_EXEC pages) as well as the TLB
|
|
* so that when we are unmapping an executable page, we also flush it.
|
|
* Combined with flushing the L1I at context switch time, this means
|
|
* we don't have to do any other icache flushes.
|
|
*/
|
|
|
|
void flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
HV_Remote_ASID asids[NR_CPUS];
|
|
int i = 0, cpu;
|
|
for_each_cpu(cpu, mm_cpumask(mm)) {
|
|
HV_Remote_ASID *asid = &asids[i++];
|
|
asid->y = cpu / smp_topology.width;
|
|
asid->x = cpu % smp_topology.width;
|
|
asid->asid = per_cpu(current_asid, cpu);
|
|
}
|
|
flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(mm),
|
|
0, 0, 0, NULL, asids, i);
|
|
}
|
|
|
|
void flush_tlb_current_task(void)
|
|
{
|
|
flush_tlb_mm(current->mm);
|
|
}
|
|
|
|
void flush_tlb_page_mm(struct vm_area_struct *vma, struct mm_struct *mm,
|
|
unsigned long va)
|
|
{
|
|
unsigned long size = vma_kernel_pagesize(vma);
|
|
int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
|
|
flush_remote(0, cache, mm_cpumask(mm),
|
|
va, size, size, mm_cpumask(mm), NULL, 0);
|
|
}
|
|
|
|
void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
|
|
{
|
|
flush_tlb_page_mm(vma, vma->vm_mm, va);
|
|
}
|
|
EXPORT_SYMBOL(flush_tlb_page);
|
|
|
|
void flush_tlb_range(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long size = vma_kernel_pagesize(vma);
|
|
struct mm_struct *mm = vma->vm_mm;
|
|
int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
|
|
flush_remote(0, cache, mm_cpumask(mm), start, end - start, size,
|
|
mm_cpumask(mm), NULL, 0);
|
|
}
|
|
|
|
void flush_tlb_all(void)
|
|
{
|
|
int i;
|
|
for (i = 0; ; ++i) {
|
|
HV_VirtAddrRange r = hv_inquire_virtual(i);
|
|
if (r.size == 0)
|
|
break;
|
|
flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
|
|
r.start, r.size, PAGE_SIZE, cpu_online_mask,
|
|
NULL, 0);
|
|
flush_remote(0, 0, NULL,
|
|
r.start, r.size, HPAGE_SIZE, cpu_online_mask,
|
|
NULL, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Callers need to flush the L1I themselves if necessary, e.g. for
|
|
* kernel module unload. Otherwise we assume callers are not using
|
|
* executable pgprot_t's. Using EVICT_L1I means that dataplane cpus
|
|
* will get an unnecessary interrupt otherwise.
|
|
*/
|
|
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
|
{
|
|
flush_remote(0, 0, NULL,
|
|
start, end - start, PAGE_SIZE, cpu_online_mask, NULL, 0);
|
|
}
|