void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr)
{
int local = mm_is_thread_local(mm);
unsigned long ap = mmu_get_ap(mmu_virtual_psize);
unsigned long pid, end;
pid = mm ? mm->context.id : 0;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
/* 4k page size, just blow the world */
if (PAGE_SIZE == 0x1000) {
radix__flush_all_mm(mm);
return;
}
/* Otherwise first do the PWC */
if (local)
_tlbiel_pid(pid, RIC_FLUSH_PWC);
else
_tlbie_pid(pid, RIC_FLUSH_PWC);
/* Then iterate the pages */
end = addr + HPAGE_PMD_SIZE;
for (; addr < end; addr += PAGE_SIZE) {
if (local)
_tlbiel_va(addr, pid, ap, RIC_FLUSH_TLB);
else
_tlbie_va(addr, pid, ap, RIC_FLUSH_TLB);
}
no_context:
preempt_enable();
}
void radix__flush_tlb_mm(struct mm_struct *mm)
{
unsigned long pid;
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
return;
preempt_disable();
/*
* Order loads of mm_cpumask vs previous stores to clear ptes before
* the invalidate. See barrier in switch_mm_irqs_off
*/
smp_mb();
if (!mm_is_thread_local(mm)) {
if (unlikely(mm_is_singlethreaded(mm))) {
exit_flush_lazy_tlbs(mm);
goto local;
}
if (mm_needs_flush_escalation(mm))
_tlbie_pid(pid, RIC_FLUSH_ALL);
else
_tlbie_pid(pid, RIC_FLUSH_TLB);
} else {
local:
_tlbiel_pid(pid, RIC_FLUSH_TLB);
}
preempt_enable();
}
void radix__flush_tlb_range_psize(struct mm_struct *mm, unsigned long start,
unsigned long end, int psize)
{
unsigned long pid;
unsigned long addr;
int local = mm_is_thread_local(mm);
unsigned long ap = mmu_get_ap(psize);
unsigned long page_size = 1UL << mmu_psize_defs[psize].shift;
preempt_disable();
pid = mm ? mm->context.id : 0;
if (unlikely(pid == MMU_NO_CONTEXT))
goto err_out;
if (end == TLB_FLUSH_ALL ||
(end - start) > tlb_single_page_flush_ceiling * page_size) {
if (local)
_tlbiel_pid(pid, RIC_FLUSH_TLB);
else
_tlbie_pid(pid, RIC_FLUSH_TLB);
goto err_out;
}
for (addr = start; addr < end; addr += page_size) {
if (local)
_tlbiel_va(addr, pid, ap, RIC_FLUSH_TLB);
else
_tlbie_va(addr, pid, ap, RIC_FLUSH_TLB);
}
err_out:
preempt_enable();
}
/*
* Base TLB flushing operations:
*
* - flush_tlb_mm(mm) flushes the specified mm context TLB's
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(vma, start, end) flushes a range of pages
* - flush_tlb_kernel_range(start, end) flushes kernel pages
*
* - local_* variants of page and mm only apply to the current
* processor
*/
void radix__local_flush_tlb_mm(struct mm_struct *mm)
{
unsigned long pid;
preempt_disable();
pid = mm->context.id;
if (pid != MMU_NO_CONTEXT)
_tlbiel_pid(pid, RIC_FLUSH_ALL);
preempt_enable();
}
void radix__local_flush_tlb_pwc(struct mmu_gather *tlb, unsigned long addr)
{
unsigned long pid;
struct mm_struct *mm = tlb->mm;
preempt_disable();
pid = mm->context.id;
if (pid != MMU_NO_CONTEXT)
_tlbiel_pid(pid, RIC_FLUSH_PWC);
preempt_enable();
}
void radix__flush_all_mm(struct mm_struct *mm)
{
unsigned long pid;
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
return;
preempt_disable();
if (!mm_is_thread_local(mm))
_tlbie_pid(pid, RIC_FLUSH_ALL);
else
_tlbiel_pid(pid, RIC_FLUSH_ALL);
preempt_enable();
}
static void do_exit_flush_lazy_tlb(void *arg)
{
struct mm_struct *mm = arg;
unsigned long pid = mm->context.id;
if (current->mm == mm)
return; /* Local CPU */
if (current->active_mm == mm) {
/*
* Must be a kernel thread because sender is single-threaded.
*/
BUG_ON(current->mm);
mmgrab(&init_mm);
switch_mm(mm, &init_mm, current);
current->active_mm = &init_mm;
mmdrop(mm);
}
_tlbiel_pid(pid, RIC_FLUSH_ALL);
}
void radix__flush_tlb_mm(struct mm_struct *mm)
{
unsigned long pid;
preempt_disable();
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
if (!mm_is_thread_local(mm)) {
int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
if (lock_tlbie)
raw_spin_lock(&native_tlbie_lock);
_tlbie_pid(pid, RIC_FLUSH_ALL);
if (lock_tlbie)
raw_spin_unlock(&native_tlbie_lock);
} else
_tlbiel_pid(pid, RIC_FLUSH_ALL);
no_context:
preempt_enable();
}
extern void radix_kvm_prefetch_workaround(struct mm_struct *mm)
{
unsigned int pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
return;
/*
* If this context hasn't run on that CPU before and KVM is
* around, there's a slim chance that the guest on another
* CPU just brought in obsolete translation into the TLB of
* this CPU due to a bad prefetch using the guest PID on
* the way into the hypervisor.
*
* We work around this here. If KVM is possible, we check if
* any sibling thread is in KVM. If it is, the window may exist
* and thus we flush that PID from the core.
*
* A potential future improvement would be to mark which PIDs
* have never been used on the system and avoid it if the PID
* is new and the process has no other cpumask bit set.
*/
if (cpu_has_feature(CPU_FTR_HVMODE) && radix_enabled()) {
int cpu = smp_processor_id();
int sib = cpu_first_thread_sibling(cpu);
bool flush = false;
for (; sib <= cpu_last_thread_sibling(cpu) && !flush; sib++) {
if (sib == cpu)
continue;
if (paca[sib].kvm_hstate.kvm_vcpu)
flush = true;
}
if (flush)
_tlbiel_pid(pid, RIC_FLUSH_ALL);
}
}
static void __flush_all_mm(struct mm_struct *mm, bool fullmm)
{
unsigned long pid;
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
return;
preempt_disable();
smp_mb(); /* see radix__flush_tlb_mm */
if (!mm_is_thread_local(mm)) {
if (unlikely(mm_is_singlethreaded(mm))) {
if (!fullmm) {
exit_flush_lazy_tlbs(mm);
goto local;
}
}
_tlbie_pid(pid, RIC_FLUSH_ALL);
} else {
local:
_tlbiel_pid(pid, RIC_FLUSH_ALL);
}
preempt_enable();
}
static inline void __radix__flush_tlb_range(struct mm_struct *mm,
unsigned long start, unsigned long end,
bool flush_all_sizes)
{
unsigned long pid;
unsigned int page_shift = mmu_psize_defs[mmu_virtual_psize].shift;
unsigned long page_size = 1UL << page_shift;
unsigned long nr_pages = (end - start) >> page_shift;
bool local, full;
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
return;
preempt_disable();
smp_mb(); /* see radix__flush_tlb_mm */
if (!mm_is_thread_local(mm)) {
if (unlikely(mm_is_singlethreaded(mm))) {
if (end != TLB_FLUSH_ALL) {
exit_flush_lazy_tlbs(mm);
goto is_local;
}
}
local = false;
full = (end == TLB_FLUSH_ALL ||
nr_pages > tlb_single_page_flush_ceiling);
} else {
is_local:
local = true;
full = (end == TLB_FLUSH_ALL ||
nr_pages > tlb_local_single_page_flush_ceiling);
}
if (full) {
if (local) {
_tlbiel_pid(pid, RIC_FLUSH_TLB);
} else {
if (mm_needs_flush_escalation(mm))
_tlbie_pid(pid, RIC_FLUSH_ALL);
else
_tlbie_pid(pid, RIC_FLUSH_TLB);
}
} else {
bool hflush = flush_all_sizes;
bool gflush = flush_all_sizes;
unsigned long hstart, hend;
unsigned long gstart, gend;
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
hflush = true;
if (hflush) {
hstart = (start + PMD_SIZE - 1) & PMD_MASK;
hend = end & PMD_MASK;
if (hstart == hend)
hflush = false;
}
if (gflush) {
gstart = (start + PUD_SIZE - 1) & PUD_MASK;
gend = end & PUD_MASK;
if (gstart == gend)
gflush = false;
}
asm volatile("ptesync": : :"memory");
if (local) {
__tlbiel_va_range(start, end, pid, page_size, mmu_virtual_psize);
if (hflush)
__tlbiel_va_range(hstart, hend, pid,
PMD_SIZE, MMU_PAGE_2M);
if (gflush)
__tlbiel_va_range(gstart, gend, pid,
PUD_SIZE, MMU_PAGE_1G);
asm volatile("ptesync": : :"memory");
} else {
__tlbie_va_range(start, end, pid, page_size, mmu_virtual_psize);
if (hflush)
__tlbie_va_range(hstart, hend, pid,
PMD_SIZE, MMU_PAGE_2M);
if (gflush)
__tlbie_va_range(gstart, gend, pid,
PUD_SIZE, MMU_PAGE_1G);
fixup_tlbie();
asm volatile("eieio; tlbsync; ptesync": : :"memory");
}
}
void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long pid;
unsigned int page_shift = mmu_psize_defs[mmu_virtual_psize].shift;
unsigned long page_size = 1UL << page_shift;
unsigned long nr_pages = (end - start) >> page_shift;
bool local, full;
#ifdef CONFIG_HUGETLB_PAGE
if (is_vm_hugetlb_page(vma))
return radix__flush_hugetlb_tlb_range(vma, start, end);
#endif
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
return;
preempt_disable();
if (mm_is_thread_local(mm)) {
local = true;
full = (end == TLB_FLUSH_ALL ||
nr_pages > tlb_local_single_page_flush_ceiling);
} else {
local = false;
full = (end == TLB_FLUSH_ALL ||
nr_pages > tlb_single_page_flush_ceiling);
}
if (full) {
if (local) {
_tlbiel_pid(pid, RIC_FLUSH_TLB);
} else {
if (mm_needs_flush_escalation(mm))
_tlbie_pid(pid, RIC_FLUSH_ALL);
else
_tlbie_pid(pid, RIC_FLUSH_TLB);
}
} else {
bool hflush = false;
unsigned long hstart, hend;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
hstart = (start + HPAGE_PMD_SIZE - 1) >> HPAGE_PMD_SHIFT;
hend = end >> HPAGE_PMD_SHIFT;
if (hstart < hend) {
hstart <<= HPAGE_PMD_SHIFT;
hend <<= HPAGE_PMD_SHIFT;
hflush = true;
}
#endif
asm volatile("ptesync": : :"memory");
if (local) {
__tlbiel_va_range(start, end, pid, page_size, mmu_virtual_psize);
if (hflush)
__tlbiel_va_range(hstart, hend, pid,
HPAGE_PMD_SIZE, MMU_PAGE_2M);
asm volatile("ptesync": : :"memory");
} else {
__tlbie_va_range(start, end, pid, page_size, mmu_virtual_psize);
if (hflush)
__tlbie_va_range(hstart, hend, pid,
HPAGE_PMD_SIZE, MMU_PAGE_2M);
fixup_tlbie();
asm volatile("eieio; tlbsync; ptesync": : :"memory");
}
}
