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Commit 172546bf authored by Thiemo Seufer's avatar Thiemo Seufer Committed by Ralf Baechle
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Fix race conditions for read_c0_entryhi. Remove broken ASID masks in 

tlb-sb1.c. Make tlb-r4k.c and tlb-sb1.c more similiar and more efficient.
Signed-off-by: default avatarThiemo Seufer <ths@networkno.de>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 202d0388
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Showing with 63 additions and 45 deletions
arch/mips/mm/tlb-r4k.c
View file @ 172546bf
......@@ -21,6 +21,12 @@
extern void build_tlb_refill_handler(void);
/*
* Make sure all entries differ. If they're not different
* MIPS32 will take revenge ...
*/
#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
/* CP0 hazard avoidance. */
#define BARRIER __asm__ __volatile__(".set noreorder\n\t" \
"nop; nop; nop; nop; nop; nop;\n\t" \
......@@ -42,11 +48,8 @@ void local_flush_tlb_all(void)
/* Blast 'em all away. */
while (entry < current_cpu_data.tlbsize) {
/*
* Make sure all entries differ. If they're not different
* MIPS32 will take revenge ...
*/
write_c0_entryhi(CKSEG0 + (entry << (PAGE_SHIFT + 1)));
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
write_c0_index(entry);
mtc0_tlbw_hazard();
tlb_write_indexed();
......@@ -57,12 +60,21 @@ void local_flush_tlb_all(void)
local_irq_restore(flags);
}
/* All entries common to a mm share an asid. To effectively flush
these entries, we just bump the asid. */
void local_flush_tlb_mm(struct mm_struct *mm)
{
int cpu = smp_processor_id();
int cpu;
preempt_disable();
if (cpu_context(cpu, mm) != 0)
drop_mmu_context(mm,cpu);
cpu = smp_processor_id();
if (cpu_context(cpu, mm) != 0) {
drop_mmu_context(mm, cpu);
}
preempt_enable();
}
void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
......@@ -75,9 +87,9 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long flags;
int size;
local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
size = (size + 1) >> 1;
local_irq_save(flags);
if (size <= current_cpu_data.tlbsize/2) {
int oldpid = read_c0_entryhi();
int newpid = cpu_asid(cpu, mm);
......@@ -99,8 +111,7 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
if (idx < 0)
continue;
/* Make sure all entries differ. */
write_c0_entryhi(CKSEG0 +
(idx << (PAGE_SHIFT + 1)));
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
mtc0_tlbw_hazard();
tlb_write_indexed();
}
......@@ -118,9 +129,9 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
unsigned long flags;
int size;
local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
size = (size + 1) >> 1;
local_irq_save(flags);
if (size <= current_cpu_data.tlbsize / 2) {
int pid = read_c0_entryhi();
......@@ -142,7 +153,7 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
if (idx < 0)
continue;
/* Make sure all entries differ. */
write_c0_entryhi(CKSEG0 + (idx << (PAGE_SHIFT + 1)));
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
mtc0_tlbw_hazard();
tlb_write_indexed();
}
......@@ -176,7 +187,7 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
if (idx < 0)
goto finish;
/* Make sure all entries differ. */
write_c0_entryhi(CKSEG0 + (idx << (PAGE_SHIFT + 1)));
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
mtc0_tlbw_hazard();
tlb_write_indexed();
tlbw_use_hazard();
......@@ -197,8 +208,8 @@ void local_flush_tlb_one(unsigned long page)
int oldpid, idx;
local_irq_save(flags);
page &= (PAGE_MASK << 1);
oldpid = read_c0_entryhi();
page &= (PAGE_MASK << 1);
write_c0_entryhi(page);
mtc0_tlbw_hazard();
tlb_probe();
......@@ -208,7 +219,7 @@ void local_flush_tlb_one(unsigned long page)
write_c0_entrylo1(0);
if (idx >= 0) {
/* Make sure all entries differ. */
write_c0_entryhi(CKSEG0 + (idx << (PAGE_SHIFT + 1)));
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
mtc0_tlbw_hazard();
tlb_write_indexed();
tlbw_use_hazard();
......@@ -238,9 +249,9 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
if (current->active_mm != vma->vm_mm)
return;
pid = read_c0_entryhi() & ASID_MASK;
local_irq_save(flags);
pid = read_c0_entryhi() & ASID_MASK;
address &= (PAGE_MASK << 1);
write_c0_entryhi(address | pid);
pgdp = pgd_offset(vma->vm_mm, address);
......@@ -260,14 +271,12 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
write_c0_entrylo0(pte_val(*ptep++) >> 6);
write_c0_entrylo1(pte_val(*ptep) >> 6);
#endif
write_c0_entryhi(address | pid);
mtc0_tlbw_hazard();
if (idx < 0)
tlb_write_random();
else
tlb_write_indexed();
tlbw_use_hazard();
write_c0_entryhi(pid);
local_irq_restore(flags);
}
......
arch/mips/mm/tlb-sb1.c
View file @ 172546bf
......@@ -94,7 +94,7 @@ void local_flush_tlb_all(void)
local_irq_save(flags);
/* Save old context and create impossible VPN2 value */
old_ctx = read_c0_entryhi() & ASID_MASK;
old_ctx = read_c0_entryhi();
write_c0_entrylo0(0);
write_c0_entrylo1(0);
......@@ -144,17 +144,17 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long flags;
int cpu;
int cpu = smp_processor_id();
local_irq_save(flags);
cpu = smp_processor_id();
if (cpu_context(cpu, mm) != 0) {
unsigned long flags;
int size;
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
size = (size + 1) >> 1;
local_irq_save(flags);
if (size <= (current_cpu_data.tlbsize/2)) {
int oldpid = read_c0_entryhi() & ASID_MASK;
int oldpid = read_c0_entryhi();
int newpid = cpu_asid(cpu, mm);
start &= (PAGE_MASK << 1);
......@@ -169,17 +169,17 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
idx = read_c0_index();
write_c0_entrylo0(0);
write_c0_entrylo1(0);
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
if (idx < 0)
continue;
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
tlb_write_indexed();
}
write_c0_entryhi(oldpid);
} else {
drop_mmu_context(mm, cpu);
}
}
local_irq_restore(flags);
}
}
void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
......@@ -189,7 +189,6 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
size = (size + 1) >> 1;
local_irq_save(flags);
if (size <= (current_cpu_data.tlbsize/2)) {
int pid = read_c0_entryhi();
......@@ -207,9 +206,9 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
idx = read_c0_index();
write_c0_entrylo0(0);
write_c0_entrylo1(0);
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
if (idx < 0)
continue;
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
tlb_write_indexed();
}
write_c0_entryhi(pid);
......@@ -221,15 +220,16 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
unsigned long flags;
int cpu = smp_processor_id();
local_irq_save(flags);
if (cpu_context(cpu, vma->vm_mm) != 0) {
unsigned long flags;
int oldpid, newpid, idx;
newpid = cpu_asid(cpu, vma->vm_mm);
page &= (PAGE_MASK << 1);
oldpid = read_c0_entryhi() & ASID_MASK;
local_irq_save(flags);
oldpid = read_c0_entryhi();
write_c0_entryhi(page | newpid);
tlb_probe();
idx = read_c0_index();
......@@ -240,10 +240,11 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
tlb_write_indexed();
finish:
write_c0_entryhi(oldpid);
}
local_irq_restore(flags);
}
}
/*
......@@ -255,18 +256,17 @@ void local_flush_tlb_one(unsigned long page)
unsigned long flags;
int oldpid, idx;
page &= (PAGE_MASK << 1);
oldpid = read_c0_entryhi() & ASID_MASK;
local_irq_save(flags);
oldpid = read_c0_entryhi();
page &= (PAGE_MASK << 1);
write_c0_entryhi(page);
tlb_probe();
idx = read_c0_index();
write_c0_entrylo0(0);
write_c0_entrylo1(0);
if (idx >= 0) {
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
write_c0_entrylo0(0);
write_c0_entrylo1(0);
tlb_write_indexed();
}
......@@ -297,6 +297,7 @@ void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
unsigned long flags;
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
int idx, pid;
......@@ -311,19 +312,26 @@ void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
pid = read_c0_entryhi() & ASID_MASK;
address &= (PAGE_MASK << 1);
write_c0_entryhi(address | (pid));
write_c0_entryhi(address | pid);
pgdp = pgd_offset(vma->vm_mm, address);
tlb_probe();
pmdp = pmd_offset(pgdp, address);
pudp = pud_offset(pgdp, address);
pmdp = pmd_offset(pudp, address);
idx = read_c0_index();
ptep = pte_offset_map(pmdp, address);
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
write_c0_entrylo0(ptep->pte_high);
ptep++;
write_c0_entrylo1(ptep->pte_high);
#else
write_c0_entrylo0(pte_val(*ptep++) >> 6);
write_c0_entrylo1(pte_val(*ptep) >> 6);
if (idx < 0) {
#endif
if (idx < 0)
tlb_write_random();
} else {
else
tlb_write_indexed();
}
local_irq_restore(flags);
}
......@@ -336,7 +344,8 @@ void __init add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
unsigned long old_ctx;
local_irq_save(flags);
old_ctx = read_c0_entryhi() & 0xff;
/* Save old context and create impossible VPN2 value */
old_ctx = read_c0_entryhi();
old_pagemask = read_c0_pagemask();
wired = read_c0_wired();
write_c0_wired(wired + 1);
......
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