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x86: change flush_tlb_others to take a const struct cpumask

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Impact: reduce stack usage, use new cpumask API.

This is made a little more tricky by uv_flush_tlb_others which
actually alters its argument, for an IPI to be sent to the remaining
cpus in the mask.

I solve this by allocating a cpumask_var_t for this case and falling back
to IPI should this fail.

To eliminate temporaries in the caller, all flush_tlb_others implementations
now do the this-cpu-elimination step themselves.

Note also the curious "cpus_or(f->flush_cpumask, cpumask, f->flush_cpumask)"
which has been there since pre-git and yet f->flush_cpumask is always zero
at this point.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
This commit is contained in:
Rusty Russell 2009-01-10 21:58:09 -08:00 committed by Ingo Molnar
parent 802bf931f2
commit 4595f9620c
7 changed files with 93 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/include/asm/paravirt.h
View File

@ -244,7 +244,8 @@ struct pv_mmu_ops {
void (*flush_tlb_user)(void);
void (*flush_tlb_kernel)(void);
void (*flush_tlb_single)(unsigned long addr);
void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
void (*flush_tlb_others)(const struct cpumask *cpus,
struct mm_struct *mm,
unsigned long va);
/* Hooks for allocating and freeing a pagetable top-level */
@ -984,10 +985,11 @@ static inline void __flush_tlb_single(unsigned long addr)
PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
}
static inline void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
static inline void flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm,
unsigned long va)
{
PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, &cpumask, mm, va);
PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, cpumask, mm, va);
}
static inline int paravirt_pgd_alloc(struct mm_struct *mm)

8
arch/x86/include/asm/tlbflush.h
View File

@ -113,7 +113,7 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
__flush_tlb();
}
static inline void native_flush_tlb_others(const cpumask_t *cpumask,
static inline void native_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm,
unsigned long va)
{
@ -142,8 +142,8 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
flush_tlb_mm(vma->vm_mm);
}
void native_flush_tlb_others(const cpumask_t *cpumask, struct mm_struct *mm,
unsigned long va);
void native_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm, unsigned long va);
#define TLBSTATE_OK 1
#define TLBSTATE_LAZY 2
@ -166,7 +166,7 @@ static inline void reset_lazy_tlbstate(void)
#endif /* SMP */
#ifndef CONFIG_PARAVIRT
#define flush_tlb_others(mask, mm, va) native_flush_tlb_others(&mask, mm, va)
#define flush_tlb_others(mask, mm, va) native_flush_tlb_others(mask, mm, va)
#endif
static inline void flush_tlb_kernel_range(unsigned long start,

3
arch/x86/include/asm/uv/uv_bau.h
View File

@ -325,7 +325,8 @@ static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
#define cpubit_isset(cpu, bau_local_cpumask) \
test_bit((cpu), (bau_local_cpumask).bits)
extern int uv_flush_tlb_others(cpumask_t *, struct mm_struct *, unsigned long);
extern int uv_flush_tlb_others(struct cpumask *,
struct mm_struct *, unsigned long);
extern void uv_bau_message_intr1(void);
extern void uv_bau_timeout_intr1(void);

67
arch/x86/kernel/tlb_32.c
View File

@ -20,7 +20,7 @@ DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate)
* Optimizations Manfred Spraul <manfred@colorfullife.com>
*/
static cpumask_t flush_cpumask;
static cpumask_var_t flush_cpumask;
static struct mm_struct *flush_mm;
static unsigned long flush_va;
static DEFINE_SPINLOCK(tlbstate_lock);
@ -92,7 +92,7 @@ void smp_invalidate_interrupt(struct pt_regs *regs)
cpu = get_cpu();
if (!cpu_isset(cpu, flush_cpumask))
if (!cpumask_test_cpu(cpu, flush_cpumask))
goto out;
/*
* This was a BUG() but until someone can quote me the
@ -114,35 +114,22 @@ void smp_invalidate_interrupt(struct pt_regs *regs)
}
ack_APIC_irq();
smp_mb__before_clear_bit();
cpu_clear(cpu, flush_cpumask);
cpumask_clear_cpu(cpu, flush_cpumask);
smp_mb__after_clear_bit();
out:
put_cpu_no_resched();
inc_irq_stat(irq_tlb_count);
}
void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
unsigned long va)
void native_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm, unsigned long va)
{
cpumask_t cpumask = *cpumaskp;
/*
* A couple of (to be removed) sanity checks:
*
* - current CPU must not be in mask
* - mask must exist :)
*/
BUG_ON(cpus_empty(cpumask));
BUG_ON(cpu_isset(smp_processor_id(), cpumask));
BUG_ON(cpumask_empty(cpumask));
BUG_ON(!mm);
#ifdef CONFIG_HOTPLUG_CPU
/* If a CPU which we ran on has gone down, OK. */
cpus_and(cpumask, cpumask, cpu_online_map);
if (unlikely(cpus_empty(cpumask)))
return;
#endif
/*
* i'm not happy about this global shared spinlock in the
* MM hot path, but we'll see how contended it is.
@ -150,9 +137,17 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
*/
spin_lock(&tlbstate_lock);
cpumask_andnot(flush_cpumask, cpumask, cpumask_of(smp_processor_id()));
#ifdef CONFIG_HOTPLUG_CPU
/* If a CPU which we ran on has gone down, OK. */
cpumask_and(flush_cpumask, flush_cpumask, cpu_online_mask);
if (unlikely(cpumask_empty(flush_cpumask))) {
spin_unlock(&tlbstate_lock);
return;
}
#endif
flush_mm = mm;
flush_va = va;
cpus_or(flush_cpumask, cpumask, flush_cpumask);
/*
* Make the above memory operations globally visible before
@ -163,9 +158,9 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
* We have to send the IPI only to
* CPUs affected.
*/
send_IPI_mask(&cpumask, INVALIDATE_TLB_VECTOR);
send_IPI_mask(flush_cpumask, INVALIDATE_TLB_VECTOR);
while (!cpus_empty(flush_cpumask))
while (!cpumask_empty(flush_cpumask))
/* nothing. lockup detection does not belong here */
cpu_relax();
@ -177,25 +172,19 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
void flush_tlb_current_task(void)
{
struct mm_struct *mm = current->mm;
cpumask_t cpu_mask;
preempt_disable();
cpu_mask = mm->cpu_vm_mask;
cpu_clear(smp_processor_id(), cpu_mask);
local_flush_tlb();
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL);
if (cpumask_any_but(&mm->cpu_vm_mask, smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(&mm->cpu_vm_mask, mm, TLB_FLUSH_ALL);
preempt_enable();
}
void flush_tlb_mm(struct mm_struct *mm)
{
cpumask_t cpu_mask;
preempt_disable();
cpu_mask = mm->cpu_vm_mask;
cpu_clear(smp_processor_id(), cpu_mask);
if (current->active_mm == mm) {
if (current->mm)
@ -203,8 +192,8 @@ void flush_tlb_mm(struct mm_struct *mm)
else
leave_mm(smp_processor_id());
}
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL);
if (cpumask_any_but(&mm->cpu_vm_mask, smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(&mm->cpu_vm_mask, mm, TLB_FLUSH_ALL);
preempt_enable();
}
@ -212,11 +201,8 @@ void flush_tlb_mm(struct mm_struct *mm)
void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
{
struct mm_struct *mm = vma->vm_mm;
cpumask_t cpu_mask;
preempt_disable();
cpu_mask = mm->cpu_vm_mask;
cpu_clear(smp_processor_id(), cpu_mask);
if (current->active_mm == mm) {
if (current->mm)
@ -225,9 +211,8 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
leave_mm(smp_processor_id());
}
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, va);
if (cpumask_any_but(&mm->cpu_vm_mask, smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(&mm->cpu_vm_mask, mm, va);
preempt_enable();
}
EXPORT_SYMBOL(flush_tlb_page);
@ -254,3 +239,9 @@ void reset_lazy_tlbstate(void)
per_cpu(cpu_tlbstate, cpu).active_mm = &init_mm;
}
static int init_flush_cpumask(void)
{
alloc_cpumask_var(&flush_cpumask, GFP_KERNEL);
return 0;
}
early_initcall(init_flush_cpumask);

61
arch/x86/kernel/tlb_64.c
View File

@ -43,10 +43,10 @@
union smp_flush_state {
struct {
cpumask_t flush_cpumask;
struct mm_struct *flush_mm;
unsigned long flush_va;
spinlock_t tlbstate_lock;
DECLARE_BITMAP(flush_cpumask, NR_CPUS);
};
char pad[SMP_CACHE_BYTES];
} ____cacheline_aligned;
@ -131,7 +131,7 @@ asmlinkage void smp_invalidate_interrupt(struct pt_regs *regs)
sender = ~regs->orig_ax - INVALIDATE_TLB_VECTOR_START;
f = &per_cpu(flush_state, sender);
if (!cpu_isset(cpu, f->flush_cpumask))
if (!cpumask_test_cpu(cpu, to_cpumask(f->flush_cpumask)))
goto out;
/*
* This was a BUG() but until someone can quote me the
@ -153,19 +153,15 @@ asmlinkage void smp_invalidate_interrupt(struct pt_regs *regs)
}
out:
ack_APIC_irq();
cpu_clear(cpu, f->flush_cpumask);
cpumask_clear_cpu(cpu, to_cpumask(f->flush_cpumask));
inc_irq_stat(irq_tlb_count);
}
void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
unsigned long va)
static void flush_tlb_others_ipi(const struct cpumask *cpumask,
struct mm_struct *mm, unsigned long va)
{
int sender;
union smp_flush_state *f;
cpumask_t cpumask = *cpumaskp;
if (is_uv_system() && uv_flush_tlb_others(&cpumask, mm, va))
return;
/* Caller has disabled preemption */
sender = smp_processor_id() % NUM_INVALIDATE_TLB_VECTORS;
@ -180,7 +176,8 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
f->flush_mm = mm;
f->flush_va = va;
cpus_or(f->flush_cpumask, cpumask, f->flush_cpumask);
cpumask_andnot(to_cpumask(f->flush_cpumask),
cpumask, cpumask_of(smp_processor_id()));
/*
* Make the above memory operations globally visible before
@ -191,9 +188,9 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
* We have to send the IPI only to
* CPUs affected.
*/
send_IPI_mask(&cpumask, INVALIDATE_TLB_VECTOR_START + sender);
send_IPI_mask(cpumask, INVALIDATE_TLB_VECTOR_START + sender);
while (!cpus_empty(f->flush_cpumask))
while (!cpumask_empty(to_cpumask(f->flush_cpumask)))
cpu_relax();
f->flush_mm = NULL;
@ -201,6 +198,24 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
spin_unlock(&f->tlbstate_lock);
}
void native_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm, unsigned long va)
{
if (is_uv_system()) {
cpumask_var_t after_uv_flush;
if (alloc_cpumask_var(&after_uv_flush, GFP_ATOMIC)) {
cpumask_andnot(after_uv_flush,
cpumask, cpumask_of(smp_processor_id()));
if (!uv_flush_tlb_others(after_uv_flush, mm, va))
flush_tlb_others_ipi(after_uv_flush, mm, va);
free_cpumask_var(after_uv_flush);
return;
}
}
flush_tlb_others_ipi(cpumask, mm, va);
}
static int __cpuinit init_smp_flush(void)
{
int i;
@ -215,25 +230,18 @@ core_initcall(init_smp_flush);
void flush_tlb_current_task(void)
{
struct mm_struct *mm = current->mm;
cpumask_t cpu_mask;
preempt_disable();
cpu_mask = mm->cpu_vm_mask;
cpu_clear(smp_processor_id(), cpu_mask);
local_flush_tlb();
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL);
if (cpumask_any_but(&mm->cpu_vm_mask, smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(&mm->cpu_vm_mask, mm, TLB_FLUSH_ALL);
preempt_enable();
}
void flush_tlb_mm(struct mm_struct *mm)
{
cpumask_t cpu_mask;
preempt_disable();
cpu_mask = mm->cpu_vm_mask;
cpu_clear(smp_processor_id(), cpu_mask);
if (current->active_mm == mm) {
if (current->mm)
@ -241,8 +249,8 @@ void flush_tlb_mm(struct mm_struct *mm)
else
leave_mm(smp_processor_id());
}
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL);
if (cpumask_any_but(&mm->cpu_vm_mask, smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(&mm->cpu_vm_mask, mm, TLB_FLUSH_ALL);
preempt_enable();
}
@ -250,11 +258,8 @@ void flush_tlb_mm(struct mm_struct *mm)
void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
{
struct mm_struct *mm = vma->vm_mm;
cpumask_t cpu_mask;
preempt_disable();
cpu_mask = mm->cpu_vm_mask;
cpu_clear(smp_processor_id(), cpu_mask);
if (current->active_mm == mm) {
if (current->mm)
@ -263,8 +268,8 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
leave_mm(smp_processor_id());
}
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, va);
if (cpumask_any_but(&mm->cpu_vm_mask, smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(&mm->cpu_vm_mask, mm, va);
preempt_enable();
}

16
arch/x86/kernel/tlb_uv.c
View File

@ -212,11 +212,11 @@ static int uv_wait_completion(struct bau_desc *bau_desc,
* The cpumaskp mask contains the cpus the broadcast was sent to.
*
* Returns 1 if all remote flushing was done. The mask is zeroed.
* Returns 0 if some remote flushing remains to be done. The mask is left
* unchanged.
* Returns 0 if some remote flushing remains to be done. The mask will have
* some bits still set.
*/
int uv_flush_send_and_wait(int cpu, int this_blade, struct bau_desc *bau_desc,
cpumask_t *cpumaskp)
struct cpumask *cpumaskp)
{
int completion_status = 0;
int right_shift;
@ -263,13 +263,13 @@ int uv_flush_send_and_wait(int cpu, int this_blade, struct bau_desc *bau_desc,
* Success, so clear the remote cpu's from the mask so we don't
* use the IPI method of shootdown on them.
*/
for_each_cpu_mask(bit, *cpumaskp) {
for_each_cpu(bit, cpumaskp) {
blade = uv_cpu_to_blade_id(bit);
if (blade == this_blade)
continue;
cpu_clear(bit, *cpumaskp);
cpumask_clear_cpu(bit, cpumaskp);
}
if (!cpus_empty(*cpumaskp))
if (!cpumask_empty(cpumaskp))
return 0;
return 1;
}
@ -296,7 +296,7 @@ int uv_flush_send_and_wait(int cpu, int this_blade, struct bau_desc *bau_desc,
* Returns 1 if all remote flushing was done.
* Returns 0 if some remote flushing remains to be done.
*/
int uv_flush_tlb_others(cpumask_t *cpumaskp, struct mm_struct *mm,
int uv_flush_tlb_others(struct cpumask *cpumaskp, struct mm_struct *mm,
unsigned long va)
{
int i;
@ -315,7 +315,7 @@ int uv_flush_tlb_others(cpumask_t *cpumaskp, struct mm_struct *mm,
bau_nodes_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
i = 0;
for_each_cpu_mask(bit, *cpumaskp) {
for_each_cpu(bit, cpumaskp) {
blade = uv_cpu_to_blade_id(bit);
BUG_ON(blade > (UV_DISTRIBUTION_SIZE - 1));
if (blade == this_blade) {

31
arch/x86/xen/enlighten.c
View File

@ -634,35 +634,27 @@ static void xen_flush_tlb_single(unsigned long addr)
preempt_enable();
}
static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
unsigned long va)
static void xen_flush_tlb_others(const struct cpumask *cpus,
struct mm_struct *mm, unsigned long va)
{
struct {
struct mmuext_op op;
cpumask_t mask;
DECLARE_BITMAP(mask, NR_CPUS);
} *args;
cpumask_t cpumask = *cpus;
struct multicall_space mcs;
/*
* A couple of (to be removed) sanity checks:
*
* - current CPU must not be in mask
* - mask must exist :)
*/
BUG_ON(cpus_empty(cpumask));
BUG_ON(cpu_isset(smp_processor_id(), cpumask));
BUG_ON(cpumask_empty(cpus));
BUG_ON(!mm);
/* If a CPU which we ran on has gone down, OK. */
cpus_and(cpumask, cpumask, cpu_online_map);
if (cpus_empty(cpumask))
return;
mcs = xen_mc_entry(sizeof(*args));
args = mcs.args;
args->mask = cpumask;
args->op.arg2.vcpumask = &args->mask;
args->op.arg2.vcpumask = to_cpumask(args->mask);
/* Remove us, and any offline CPUS. */
cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
if (unlikely(cpumask_empty(to_cpumask(args->mask))))
goto issue;
if (va == TLB_FLUSH_ALL) {
args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
@ -673,6 +665,7 @@ static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
issue:
xen_mc_issue(PARAVIRT_LAZY_MMU);
}