x86-64: Move TLB state from PDA to per-cpu and consolidate with 32-bit.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/arch/x86/include/asm/mmu_context_64.h b/arch/x86/include/asm/mmu_context_64.h
index 677d36e..c457250 100644 (file)
--- a/arch/x86/include/asm/mmu_context_64.h
+++ b/arch/x86/include/asm/mmu_context_64.h
@@ -1,13 +1,11 @@
 #ifndef _ASM_X86_MMU_CONTEXT_64_H
 #define _ASM_X86_MMU_CONTEXT_64_H
 
-#include <asm/pda.h>
-
 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 (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
+               percpu_write(cpu_tlbstate.state, TLBSTATE_LAZY);
 #endif
 }
 
@@ -19,8 +17,8 @@ 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);
+               percpu_write(cpu_tlbstate.state, TLBSTATE_OK);
+               percpu_write(cpu_tlbstate.active_mm, next);
 #endif
                cpu_set(cpu, next->cpu_vm_mask);
                load_cr3(next->pgd);
@@ -30,9 +28,9 @@ 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();
+               percpu_write(cpu_tlbstate.state, TLBSTATE_OK);
+               BUG_ON(percpu_read(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 69a4075..8ee835e 100644 (file)
--- a/arch/x86/include/asm/pda.h
+++ b/arch/x86/include/asm/pda.h
@@ -25,9 +25,7 @@ struct x8664_pda {
        char *irqstackptr;
        short nodenumber;               /* number of current node (32k max) */
        short in_bootmem;               /* pda lives in bootmem */
-       short mmu_state;
        short isidle;
-       struct mm_struct *active_mm;
 } ____cacheline_aligned_in_smp;
 
 DECLARE_PER_CPU(struct x8664_pda, __pda);

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 17feaa9..d3539f9 100644 (file)
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -148,20 +148,17 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
 #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)
 {
+       percpu_write(cpu_tlbstate.state, 0);
+       percpu_write(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 c49498d..3d0cc6f 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -897,8 +897,6 @@ 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 e65449d..abf0808 100644 (file)
--- 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>
@@ -231,14 +231,6 @@ 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;
-}
-
 static int init_flush_cpumask(void)
 {
        alloc_cpumask_var(&flush_cpumask, GFP_KERNEL);

diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c
index 7f4141d..e64a32c 100644 (file)
--- 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 (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
                BUG();
-       cpu_clear(cpu, read_pda(active_mm)->cpu_vm_mask);
+       cpu_clear(cpu, percpu_read(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 == percpu_read(cpu_tlbstate.active_mm)) {
+               if (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK) {
                        if (f->flush_va == TLB_FLUSH_ALL)
                                local_flush_tlb();
                        else
@@ -281,7 +284,7 @@ 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 (percpu_read(cpu_tlbstate.state) == TLBSTATE_LAZY)
                leave_mm(cpu);
 }
 

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 7bc7852..98cb986 100644 (file)
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1063,11 +1063,7 @@ 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 = percpu_read(cpu_tlbstate.active_mm);
 
        if (active_mm == mm)
                leave_mm(smp_processor_id());