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Date: Wed, 31 Dec 2008 19:13:43 -0500
From: Brian Gerst <brgerst@...il.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org, Brian Gerst <brgerst@...il.com>
Subject: [PATCH 4/4] x86-64: Move TLB state from PDA to per-cpu and consolidate with 32-bit.
Signed-off-by: Brian Gerst <brgerst@...il.com>
---
arch/x86/include/asm/mmu_context_64.h | 14 +++++++-------
arch/x86/include/asm/pda.h | 2 --
arch/x86/include/asm/tlbflush.h | 7 ++-----
arch/x86/kernel/cpu/common.c | 2 --
arch/x86/kernel/tlb_32.c | 12 ++----------
arch/x86/kernel/tlb_64.c | 13 ++++++++-----
arch/x86/xen/mmu.c | 6 +-----
7 files changed, 20 insertions(+), 36 deletions(-)
diff --git a/arch/x86/include/asm/mmu_context_64.h b/arch/x86/include/asm/mmu_context_64.h
index 677d36e..8fb6060 100644
--- a/arch/x86/include/asm/mmu_context_64.h
+++ b/arch/x86/include/asm/mmu_context_64.h
@@ -6,8 +6,8 @@
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
#ifdef CONFIG_SMP
- if (read_pda(mmu_state) == TLBSTATE_OK)
- write_pda(mmu_state, TLBSTATE_LAZY);
+ if (x86_read_percpu(cpu_tlbstate.state) == TLBSTATE_OK)
+ x86_write_percpu(cpu_tlbstate.state, TLBSTATE_LAZY);
#endif
}
@@ -19,8 +19,8 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
/* stop flush ipis for the previous mm */
cpu_clear(cpu, prev->cpu_vm_mask);
#ifdef CONFIG_SMP
- write_pda(mmu_state, TLBSTATE_OK);
- write_pda(active_mm, next);
+ x86_write_percpu(cpu_tlbstate.state, TLBSTATE_OK);
+ x86_write_percpu(cpu_tlbstate.active_mm, next);
#endif
cpu_set(cpu, next->cpu_vm_mask);
load_cr3(next->pgd);
@@ -30,9 +30,9 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
#ifdef CONFIG_SMP
else {
- write_pda(mmu_state, TLBSTATE_OK);
- if (read_pda(active_mm) != next)
- BUG();
+ x86_write_percpu(cpu_tlbstate.state, TLBSTATE_OK);
+ BUG_ON(x86_read_percpu(cpu_tlbstate.active_mm) != next);
+
if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
/* We were in lazy tlb mode and leave_mm disabled
* tlb flush IPI delivery. We must reload CR3
diff --git a/arch/x86/include/asm/pda.h b/arch/x86/include/asm/pda.h
index 97a95fa..bc3b719 100644
--- a/arch/x86/include/asm/pda.h
+++ b/arch/x86/include/asm/pda.h
@@ -23,9 +23,7 @@ struct x8664_pda {
#endif
char *irqstackptr;
short nodenumber; /* number of current node (32k max) */
- short mmu_state;
short isidle;
- struct mm_struct *active_mm;
} ____cacheline_aligned_in_smp;
extern void pda_init(int);
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 0e7bbb5..b344098 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -148,20 +148,17 @@ void native_flush_tlb_others(const cpumask_t *cpumask, struct mm_struct *mm,
#define TLBSTATE_OK 1
#define TLBSTATE_LAZY 2
-#ifdef CONFIG_X86_32
struct tlb_state {
struct mm_struct *active_mm;
int state;
- char __cacheline_padding[L1_CACHE_BYTES-8];
};
DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
-void reset_lazy_tlbstate(void);
-#else
static inline void reset_lazy_tlbstate(void)
{
+ x86_write_percpu(cpu_tlbstate.state, 0);
+ x86_write_percpu(cpu_tlbstate.active_mm, &init_mm);
}
-#endif
#endif /* SMP */
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index eaf404f..7bdf87f 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -880,8 +880,6 @@ void __cpuinit pda_init(int cpu)
pda->irqcount = -1;
pda->kernelstack = (unsigned long)stack_thread_info() -
PDA_STACKOFFSET + THREAD_SIZE;
- pda->active_mm = &init_mm;
- pda->mmu_state = 0;
if (cpu == 0) {
/* others are initialized in smpboot.c */
diff --git a/arch/x86/kernel/tlb_32.c b/arch/x86/kernel/tlb_32.c
index f4049f3..4c151a9 100644
--- a/arch/x86/kernel/tlb_32.c
+++ b/arch/x86/kernel/tlb_32.c
@@ -4,8 +4,8 @@
#include <asm/tlbflush.h>
-DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate)
- ____cacheline_aligned = { &init_mm, 0, };
+DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate)
+ = { &init_mm, 0, };
/* must come after the send_IPI functions above for inlining */
#include <mach_ipi.h>
@@ -247,11 +247,3 @@ void flush_tlb_all(void)
on_each_cpu(do_flush_tlb_all, NULL, 1);
}
-void reset_lazy_tlbstate(void)
-{
- int cpu = raw_smp_processor_id();
-
- per_cpu(cpu_tlbstate, cpu).state = 0;
- per_cpu(cpu_tlbstate, cpu).active_mm = &init_mm;
-}
-
diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c
index d4c9a00..938549c 100644
--- a/arch/x86/kernel/tlb_64.c
+++ b/arch/x86/kernel/tlb_64.c
@@ -18,6 +18,9 @@
#include <asm/uv/uv_hub.h>
#include <asm/uv/uv_bau.h>
+DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate)
+ = { &init_mm, 0, };
+
#include <mach_ipi.h>
/*
* Smarter SMP flushing macros.
@@ -62,9 +65,9 @@ static DEFINE_PER_CPU(union smp_flush_state, flush_state);
*/
void leave_mm(int cpu)
{
- if (read_pda(mmu_state) == TLBSTATE_OK)
+ if (x86_read_percpu(cpu_tlbstate.state) == TLBSTATE_OK)
BUG();
- cpu_clear(cpu, read_pda(active_mm)->cpu_vm_mask);
+ cpu_clear(cpu, x86_read_percpu(cpu_tlbstate.active_mm)->cpu_vm_mask);
load_cr3(swapper_pg_dir);
}
EXPORT_SYMBOL_GPL(leave_mm);
@@ -142,8 +145,8 @@ asmlinkage void smp_invalidate_interrupt(struct pt_regs *regs)
* BUG();
*/
- if (f->flush_mm == read_pda(active_mm)) {
- if (read_pda(mmu_state) == TLBSTATE_OK) {
+ if (f->flush_mm == x86_read_percpu(cpu_tlbstate.active_mm)) {
+ if (x86_read_percpu(cpu_tlbstate.state) == TLBSTATE_OK) {
if (f->flush_va == TLB_FLUSH_ALL)
local_flush_tlb();
else
@@ -274,7 +277,7 @@ static void do_flush_tlb_all(void *info)
unsigned long cpu = smp_processor_id();
__flush_tlb_all();
- if (read_pda(mmu_state) == TLBSTATE_LAZY)
+ if (x86_read_percpu(cpu_tlbstate.state) == TLBSTATE_LAZY)
leave_mm(cpu);
}
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 636ef4c..49bdd72 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1060,11 +1060,7 @@ static void drop_other_mm_ref(void *info)
struct mm_struct *mm = info;
struct mm_struct *active_mm;
-#ifdef CONFIG_X86_64
- active_mm = read_pda(active_mm);
-#else
- active_mm = __get_cpu_var(cpu_tlbstate).active_mm;
-#endif
+ active_mm = x86_read_percpu(cpu_tlbstate.active_mm);
if (active_mm == mm)
leave_mm(smp_processor_id());
--
1.6.1.rc1
--
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