257 lines
6.3 KiB
C
257 lines
6.3 KiB
C
/*
|
|
* linux/arch/arm/kernel/smp_tlb.c
|
|
*
|
|
* Copyright (C) 2002 ARM Limited, 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 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/preempt.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/mmu_context.h>
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* TLB operations
|
|
*/
|
|
struct tlb_args {
|
|
struct vm_area_struct *ta_vma;
|
|
unsigned long ta_start;
|
|
unsigned long ta_end;
|
|
};
|
|
|
|
static inline void ipi_flush_tlb_all(void *ignored)
|
|
{
|
|
local_flush_tlb_all();
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_mm(void *arg)
|
|
{
|
|
struct mm_struct *mm = (struct mm_struct *)arg;
|
|
|
|
local_flush_tlb_mm(mm);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_page(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
unsigned int __ua_flags = uaccess_save_and_enable();
|
|
|
|
local_flush_tlb_page(ta->ta_vma, ta->ta_start);
|
|
|
|
uaccess_restore(__ua_flags);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_kernel_page(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
|
|
local_flush_tlb_kernel_page(ta->ta_start);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_range(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
unsigned int __ua_flags = uaccess_save_and_enable();
|
|
|
|
local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
|
|
|
|
uaccess_restore(__ua_flags);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_kernel_range(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
|
|
local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
|
|
}
|
|
|
|
static inline void ipi_flush_bp_all(void *ignored)
|
|
{
|
|
local_flush_bp_all();
|
|
}
|
|
|
|
#ifdef CONFIG_ARM_ERRATA_798181
|
|
bool (*erratum_a15_798181_handler)(void);
|
|
|
|
static bool erratum_a15_798181_partial(void)
|
|
{
|
|
asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
|
|
dsb(ish);
|
|
return false;
|
|
}
|
|
|
|
static bool erratum_a15_798181_broadcast(void)
|
|
{
|
|
asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
|
|
dsb(ish);
|
|
return true;
|
|
}
|
|
|
|
void erratum_a15_798181_init(void)
|
|
{
|
|
unsigned int midr = read_cpuid_id();
|
|
unsigned int revidr = read_cpuid(CPUID_REVIDR);
|
|
|
|
/* Brahma-B15 r0p0..r0p2 affected
|
|
* Cortex-A15 r0p0..r3p3 w/o ECO fix affected
|
|
* Fixes applied to A15 with respect to the revision and revidr are:
|
|
*
|
|
* r0p0-r2p1: No fixes applied
|
|
* r2p2,r2p3:
|
|
* REVIDR[4]: 798181 Moving a virtual page that is being accessed
|
|
* by an active process can lead to unexpected behavior
|
|
* REVIDR[9]: Not defined
|
|
* r2p4,r3p0,r3p1,r3p2:
|
|
* REVIDR[4]: 798181 Moving a virtual page that is being accessed
|
|
* by an active process can lead to unexpected behavior
|
|
* REVIDR[9]: 798181 Moving a virtual page that is being accessed
|
|
* by an active process can lead to unexpected behavior
|
|
* - This is an update to a previously released ECO.
|
|
* r3p3:
|
|
* REVIDR[4]: Reserved
|
|
* REVIDR[9]: 798181 Moving a virtual page that is being accessed
|
|
* by an active process can lead to unexpected behavior
|
|
* - This is an update to a previously released ECO.
|
|
*
|
|
* Handling:
|
|
* REVIDR[9] set -> No WA
|
|
* REVIDR[4] set, REVIDR[9] cleared -> Partial WA
|
|
* Both cleared -> Full WA
|
|
*/
|
|
if ((midr & 0xff0ffff0) == 0x420f00f0 && midr <= 0x420f00f2) {
|
|
erratum_a15_798181_handler = erratum_a15_798181_broadcast;
|
|
} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f2) {
|
|
erratum_a15_798181_handler = erratum_a15_798181_broadcast;
|
|
} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f4) {
|
|
if (revidr & 0x10)
|
|
erratum_a15_798181_handler =
|
|
erratum_a15_798181_partial;
|
|
else
|
|
erratum_a15_798181_handler =
|
|
erratum_a15_798181_broadcast;
|
|
} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x413fc0f3) {
|
|
if ((revidr & 0x210) == 0)
|
|
erratum_a15_798181_handler =
|
|
erratum_a15_798181_broadcast;
|
|
else if (revidr & 0x10)
|
|
erratum_a15_798181_handler =
|
|
erratum_a15_798181_partial;
|
|
} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x414fc0f0) {
|
|
if ((revidr & 0x200) == 0)
|
|
erratum_a15_798181_handler =
|
|
erratum_a15_798181_partial;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void ipi_flush_tlb_a15_erratum(void *arg)
|
|
{
|
|
dmb();
|
|
}
|
|
|
|
static void broadcast_tlb_a15_erratum(void)
|
|
{
|
|
if (!erratum_a15_798181())
|
|
return;
|
|
|
|
smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1);
|
|
}
|
|
|
|
static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
|
|
{
|
|
int this_cpu;
|
|
cpumask_t mask = { CPU_BITS_NONE };
|
|
|
|
if (!erratum_a15_798181())
|
|
return;
|
|
|
|
this_cpu = get_cpu();
|
|
a15_erratum_get_cpumask(this_cpu, mm, &mask);
|
|
smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1);
|
|
put_cpu();
|
|
}
|
|
|
|
void flush_tlb_all(void)
|
|
{
|
|
if (tlb_ops_need_broadcast())
|
|
on_each_cpu(ipi_flush_tlb_all, NULL, 1);
|
|
else
|
|
__flush_tlb_all();
|
|
broadcast_tlb_a15_erratum();
|
|
}
|
|
|
|
void flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
if (tlb_ops_need_broadcast())
|
|
on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1);
|
|
else
|
|
__flush_tlb_mm(mm);
|
|
broadcast_tlb_mm_a15_erratum(mm);
|
|
}
|
|
|
|
void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
struct tlb_args ta;
|
|
ta.ta_vma = vma;
|
|
ta.ta_start = uaddr;
|
|
on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page,
|
|
&ta, 1);
|
|
} else
|
|
__flush_tlb_page(vma, uaddr);
|
|
broadcast_tlb_mm_a15_erratum(vma->vm_mm);
|
|
}
|
|
|
|
void flush_tlb_kernel_page(unsigned long kaddr)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
struct tlb_args ta;
|
|
ta.ta_start = kaddr;
|
|
on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
|
|
} else
|
|
__flush_tlb_kernel_page(kaddr);
|
|
broadcast_tlb_a15_erratum();
|
|
}
|
|
|
|
void flush_tlb_range(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
struct tlb_args ta;
|
|
ta.ta_vma = vma;
|
|
ta.ta_start = start;
|
|
ta.ta_end = end;
|
|
on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range,
|
|
&ta, 1);
|
|
} else
|
|
local_flush_tlb_range(vma, start, end);
|
|
broadcast_tlb_mm_a15_erratum(vma->vm_mm);
|
|
}
|
|
|
|
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
struct tlb_args ta;
|
|
ta.ta_start = start;
|
|
ta.ta_end = end;
|
|
on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
|
|
} else
|
|
local_flush_tlb_kernel_range(start, end);
|
|
broadcast_tlb_a15_erratum();
|
|
}
|
|
|
|
void flush_bp_all(void)
|
|
{
|
|
if (tlb_ops_need_broadcast())
|
|
on_each_cpu(ipi_flush_bp_all, NULL, 1);
|
|
else
|
|
__flush_bp_all();
|
|
}
|