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-rw-r--r--arch/x86/include/asm/pda.h3
-rw-r--r--arch/x86/include/asm/percpu.h127
-rw-r--r--arch/x86/kernel/asm-offsets_64.c1
-rw-r--r--arch/x86/kernel/entry_64.S7
-rw-r--r--arch/x86/kernel/head64.c2
-rw-r--r--arch/x86/kernel/setup_percpu.c15
-rw-r--r--arch/x86/kernel/smpcommon.c3
-rw-r--r--arch/x86/mach-voyager/voyager_smp.c2
8 files changed, 55 insertions, 105 deletions
diff --git a/arch/x86/include/asm/pda.h b/arch/x86/include/asm/pda.h
index 2d5b49c3248e..e91558e37850 100644
--- a/arch/x86/include/asm/pda.h
+++ b/arch/x86/include/asm/pda.h
@@ -11,8 +11,7 @@
11/* Per processor datastructure. %gs points to it while the kernel runs */ 11/* Per processor datastructure. %gs points to it while the kernel runs */
12struct x8664_pda { 12struct x8664_pda {
13 struct task_struct *pcurrent; /* 0 Current process */ 13 struct task_struct *pcurrent; /* 0 Current process */
14 unsigned long data_offset; /* 8 Per cpu data offset from linker 14 unsigned long dummy;
15 address */
16 unsigned long kernelstack; /* 16 top of kernel stack for current */ 15 unsigned long kernelstack; /* 16 top of kernel stack for current */
17 unsigned long oldrsp; /* 24 user rsp for system call */ 16 unsigned long oldrsp; /* 24 user rsp for system call */
18 int irqcount; /* 32 Irq nesting counter. Starts -1 */ 17 int irqcount; /* 32 Irq nesting counter. Starts -1 */
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 0ed77cf33f76..556f84b9ea96 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -1,62 +1,13 @@
1#ifndef _ASM_X86_PERCPU_H 1#ifndef _ASM_X86_PERCPU_H
2#define _ASM_X86_PERCPU_H 2#define _ASM_X86_PERCPU_H
3 3
4#ifndef __ASSEMBLY__
5#ifdef CONFIG_X86_64 4#ifdef CONFIG_X86_64
6extern void load_pda_offset(int cpu); 5#define __percpu_seg gs
6#define __percpu_mov_op movq
7#else 7#else
8static inline void load_pda_offset(int cpu) { } 8#define __percpu_seg fs
9#endif 9#define __percpu_mov_op movl
10#endif
11
12#ifdef CONFIG_X86_64
13#include <linux/compiler.h>
14
15/* Same as asm-generic/percpu.h, except that we store the per cpu offset
16 in the PDA. Longer term the PDA and every per cpu variable
17 should be just put into a single section and referenced directly
18 from %gs */
19
20#ifdef CONFIG_SMP
21#include <asm/pda.h>
22
23#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
24#define __my_cpu_offset read_pda(data_offset)
25
26#define per_cpu_offset(x) (__per_cpu_offset(x))
27
28#endif 10#endif
29#include <asm-generic/percpu.h>
30
31DECLARE_PER_CPU(struct x8664_pda, pda);
32
33/*
34 * These are supposed to be implemented as a single instruction which
35 * operates on the per-cpu data base segment. x86-64 doesn't have
36 * that yet, so this is a fairly inefficient workaround for the
37 * meantime. The single instruction is atomic with respect to
38 * preemption and interrupts, so we need to explicitly disable
39 * interrupts here to achieve the same effect. However, because it
40 * can be used from within interrupt-disable/enable, we can't actually
41 * disable interrupts; disabling preemption is enough.
42 */
43#define x86_read_percpu(var) \
44 ({ \
45 typeof(per_cpu_var(var)) __tmp; \
46 preempt_disable(); \
47 __tmp = __get_cpu_var(var); \
48 preempt_enable(); \
49 __tmp; \
50 })
51
52#define x86_write_percpu(var, val) \
53 do { \
54 preempt_disable(); \
55 __get_cpu_var(var) = (val); \
56 preempt_enable(); \
57 } while(0)
58
59#else /* CONFIG_X86_64 */
60 11
61#ifdef __ASSEMBLY__ 12#ifdef __ASSEMBLY__
62 13
@@ -73,42 +24,26 @@ DECLARE_PER_CPU(struct x8664_pda, pda);
73 * PER_CPU(cpu_gdt_descr, %ebx) 24 * PER_CPU(cpu_gdt_descr, %ebx)
74 */ 25 */
75#ifdef CONFIG_SMP 26#ifdef CONFIG_SMP
76#define PER_CPU(var, reg) \ 27#define PER_CPU(var, reg) \
77 movl %fs:per_cpu__##this_cpu_off, reg; \ 28 __percpu_mov_op %__percpu_seg:per_cpu__this_cpu_off, reg; \
78 lea per_cpu__##var(reg), reg 29 lea per_cpu__##var(reg), reg
79#define PER_CPU_VAR(var) %fs:per_cpu__##var 30#define PER_CPU_VAR(var) %__percpu_seg:per_cpu__##var
80#else /* ! SMP */ 31#else /* ! SMP */
81#define PER_CPU(var, reg) \ 32#define PER_CPU(var, reg) \
82 movl $per_cpu__##var, reg 33 __percpu_mov_op $per_cpu__##var, reg
83#define PER_CPU_VAR(var) per_cpu__##var 34#define PER_CPU_VAR(var) per_cpu__##var
84#endif /* SMP */ 35#endif /* SMP */
85 36
86#else /* ...!ASSEMBLY */ 37#else /* ...!ASSEMBLY */
87 38
88/* 39#include <linux/stringify.h>
89 * PER_CPU finds an address of a per-cpu variable.
90 *
91 * Args:
92 * var - variable name
93 * cpu - 32bit register containing the current CPU number
94 *
95 * The resulting address is stored in the "cpu" argument.
96 *
97 * Example:
98 * PER_CPU(cpu_gdt_descr, %ebx)
99 */
100#ifdef CONFIG_SMP
101
102#define __my_cpu_offset x86_read_percpu(this_cpu_off)
103
104/* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
105#define __percpu_seg "%%fs:"
106 40
107#else /* !SMP */ 41#ifdef CONFIG_SMP
108 42#define __percpu_seg_str "%%"__stringify(__percpu_seg)":"
109#define __percpu_seg "" 43#define __my_cpu_offset x86_read_percpu(this_cpu_off)
110 44#else
111#endif /* SMP */ 45#define __percpu_seg_str
46#endif
112 47
113#include <asm-generic/percpu.h> 48#include <asm-generic/percpu.h>
114 49
@@ -128,20 +63,25 @@ do { \
128 } \ 63 } \
129 switch (sizeof(var)) { \ 64 switch (sizeof(var)) { \
130 case 1: \ 65 case 1: \
131 asm(op "b %1,"__percpu_seg"%0" \ 66 asm(op "b %1,"__percpu_seg_str"%0" \
132 : "+m" (var) \ 67 : "+m" (var) \
133 : "ri" ((T__)val)); \ 68 : "ri" ((T__)val)); \
134 break; \ 69 break; \
135 case 2: \ 70 case 2: \
136 asm(op "w %1,"__percpu_seg"%0" \ 71 asm(op "w %1,"__percpu_seg_str"%0" \
137 : "+m" (var) \ 72 : "+m" (var) \
138 : "ri" ((T__)val)); \ 73 : "ri" ((T__)val)); \
139 break; \ 74 break; \
140 case 4: \ 75 case 4: \
141 asm(op "l %1,"__percpu_seg"%0" \ 76 asm(op "l %1,"__percpu_seg_str"%0" \
142 : "+m" (var) \ 77 : "+m" (var) \
143 : "ri" ((T__)val)); \ 78 : "ri" ((T__)val)); \
144 break; \ 79 break; \
80 case 8: \
81 asm(op "q %1,"__percpu_seg_str"%0" \
82 : "+m" (var) \
83 : "r" ((T__)val)); \
84 break; \
145 default: __bad_percpu_size(); \ 85 default: __bad_percpu_size(); \
146 } \ 86 } \
147} while (0) 87} while (0)
@@ -151,17 +91,22 @@ do { \
151 typeof(var) ret__; \ 91 typeof(var) ret__; \
152 switch (sizeof(var)) { \ 92 switch (sizeof(var)) { \
153 case 1: \ 93 case 1: \
154 asm(op "b "__percpu_seg"%1,%0" \ 94 asm(op "b "__percpu_seg_str"%1,%0" \
155 : "=r" (ret__) \ 95 : "=r" (ret__) \
156 : "m" (var)); \ 96 : "m" (var)); \
157 break; \ 97 break; \
158 case 2: \ 98 case 2: \
159 asm(op "w "__percpu_seg"%1,%0" \ 99 asm(op "w "__percpu_seg_str"%1,%0" \
160 : "=r" (ret__) \ 100 : "=r" (ret__) \
161 : "m" (var)); \ 101 : "m" (var)); \
162 break; \ 102 break; \
163 case 4: \ 103 case 4: \
164 asm(op "l "__percpu_seg"%1,%0" \ 104 asm(op "l "__percpu_seg_str"%1,%0" \
105 : "=r" (ret__) \
106 : "m" (var)); \
107 break; \
108 case 8: \
109 asm(op "q "__percpu_seg_str"%1,%0" \
165 : "=r" (ret__) \ 110 : "=r" (ret__) \
166 : "m" (var)); \ 111 : "m" (var)); \
167 break; \ 112 break; \
@@ -175,8 +120,14 @@ do { \
175#define x86_add_percpu(var, val) percpu_to_op("add", per_cpu__##var, val) 120#define x86_add_percpu(var, val) percpu_to_op("add", per_cpu__##var, val)
176#define x86_sub_percpu(var, val) percpu_to_op("sub", per_cpu__##var, val) 121#define x86_sub_percpu(var, val) percpu_to_op("sub", per_cpu__##var, val)
177#define x86_or_percpu(var, val) percpu_to_op("or", per_cpu__##var, val) 122#define x86_or_percpu(var, val) percpu_to_op("or", per_cpu__##var, val)
123
124#ifdef CONFIG_X86_64
125extern void load_pda_offset(int cpu);
126#else
127static inline void load_pda_offset(int cpu) { }
128#endif
129
178#endif /* !__ASSEMBLY__ */ 130#endif /* !__ASSEMBLY__ */
179#endif /* !CONFIG_X86_64 */
180 131
181#ifdef CONFIG_SMP 132#ifdef CONFIG_SMP
182 133
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index f8d1b047ef4f..f4cc81bfbf89 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -55,7 +55,6 @@ int main(void)
55 ENTRY(irqcount); 55 ENTRY(irqcount);
56 ENTRY(cpunumber); 56 ENTRY(cpunumber);
57 ENTRY(irqstackptr); 57 ENTRY(irqstackptr);
58 ENTRY(data_offset);
59 DEFINE(pda_size, sizeof(struct x8664_pda)); 58 DEFINE(pda_size, sizeof(struct x8664_pda));
60 BLANK(); 59 BLANK();
61#undef ENTRY 60#undef ENTRY
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index e28c7a987793..4833f3a19650 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -52,6 +52,7 @@
52#include <asm/irqflags.h> 52#include <asm/irqflags.h>
53#include <asm/paravirt.h> 53#include <asm/paravirt.h>
54#include <asm/ftrace.h> 54#include <asm/ftrace.h>
55#include <asm/percpu.h>
55 56
56/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ 57/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
57#include <linux/elf-em.h> 58#include <linux/elf-em.h>
@@ -1072,10 +1073,10 @@ ENTRY(\sym)
1072 TRACE_IRQS_OFF 1073 TRACE_IRQS_OFF
1073 movq %rsp,%rdi /* pt_regs pointer */ 1074 movq %rsp,%rdi /* pt_regs pointer */
1074 xorl %esi,%esi /* no error code */ 1075 xorl %esi,%esi /* no error code */
1075 movq %gs:pda_data_offset, %rbp 1076 PER_CPU(init_tss, %rbp)
1076 subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) 1077 subq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%rbp)
1077 call \do_sym 1078 call \do_sym
1078 addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) 1079 addq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%rbp)
1079 jmp paranoid_exit /* %ebx: no swapgs flag */ 1080 jmp paranoid_exit /* %ebx: no swapgs flag */
1080 CFI_ENDPROC 1081 CFI_ENDPROC
1081END(\sym) 1082END(\sym)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 1a311293f733..e99b661a97f4 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -38,8 +38,6 @@ void __init x86_64_init_pda(void)
38#else 38#else
39 cpu_pda(0) = &_boot_cpu_pda; 39 cpu_pda(0) = &_boot_cpu_pda;
40#endif 40#endif
41 cpu_pda(0)->data_offset =
42 (unsigned long)(__per_cpu_load - __per_cpu_start);
43 pda_init(0); 41 pda_init(0);
44} 42}
45 43
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 63d462802272..be1ff34db112 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -125,14 +125,14 @@ static void __init setup_per_cpu_maps(void)
125#endif 125#endif
126} 126}
127 127
128#ifdef CONFIG_X86_32 128#ifdef CONFIG_X86_64
129/* 129unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
130 * Great future not-so-futuristic plan: make i386 and x86_64 do it 130 [0] = (unsigned long)__per_cpu_load,
131 * the same way 131};
132 */ 132#else
133unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; 133unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
134EXPORT_SYMBOL(__per_cpu_offset);
135#endif 134#endif
135EXPORT_SYMBOL(__per_cpu_offset);
136 136
137/* 137/*
138 * Great future plan: 138 * Great future plan:
@@ -178,6 +178,7 @@ void __init setup_per_cpu_areas(void)
178#endif 178#endif
179 179
180 memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start); 180 memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
181 per_cpu_offset(cpu) = ptr - __per_cpu_start;
181#ifdef CONFIG_X86_64 182#ifdef CONFIG_X86_64
182 cpu_pda(cpu) = (void *)ptr; 183 cpu_pda(cpu) = (void *)ptr;
183 184
@@ -190,7 +191,7 @@ void __init setup_per_cpu_areas(void)
190 else 191 else
191 memset(cpu_pda(cpu), 0, sizeof(*cpu_pda(cpu))); 192 memset(cpu_pda(cpu), 0, sizeof(*cpu_pda(cpu)));
192#endif 193#endif
193 per_cpu_offset(cpu) = ptr - __per_cpu_start; 194 per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
194 195
195 DBG("PERCPU: cpu %4d %p\n", cpu, ptr); 196 DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
196 } 197 }
diff --git a/arch/x86/kernel/smpcommon.c b/arch/x86/kernel/smpcommon.c
index 397e309839dd..84395fabc410 100644
--- a/arch/x86/kernel/smpcommon.c
+++ b/arch/x86/kernel/smpcommon.c
@@ -4,10 +4,10 @@
4#include <linux/module.h> 4#include <linux/module.h>
5#include <asm/smp.h> 5#include <asm/smp.h>
6 6
7#ifdef CONFIG_X86_32
8DEFINE_PER_CPU(unsigned long, this_cpu_off); 7DEFINE_PER_CPU(unsigned long, this_cpu_off);
9EXPORT_PER_CPU_SYMBOL(this_cpu_off); 8EXPORT_PER_CPU_SYMBOL(this_cpu_off);
10 9
10#ifdef CONFIG_X86_32
11/* 11/*
12 * Initialize the CPU's GDT. This is either the boot CPU doing itself 12 * Initialize the CPU's GDT. This is either the boot CPU doing itself
13 * (still using the master per-cpu area), or a CPU doing it for a 13 * (still using the master per-cpu area), or a CPU doing it for a
@@ -24,7 +24,6 @@ __cpuinit void init_gdt(int cpu)
24 write_gdt_entry(get_cpu_gdt_table(cpu), 24 write_gdt_entry(get_cpu_gdt_table(cpu),
25 GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S); 25 GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
26 26
27 per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
28 per_cpu(cpu_number, cpu) = cpu; 27 per_cpu(cpu_number, cpu) = cpu;
29} 28}
30#endif 29#endif
diff --git a/arch/x86/mach-voyager/voyager_smp.c b/arch/x86/mach-voyager/voyager_smp.c
index 9840b7ec749a..1a48368acb09 100644
--- a/arch/x86/mach-voyager/voyager_smp.c
+++ b/arch/x86/mach-voyager/voyager_smp.c
@@ -531,6 +531,7 @@ static void __init do_boot_cpu(__u8 cpu)
531 stack_start.sp = (void *)idle->thread.sp; 531 stack_start.sp = (void *)idle->thread.sp;
532 532
533 init_gdt(cpu); 533 init_gdt(cpu);
534 per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
534 per_cpu(current_task, cpu) = idle; 535 per_cpu(current_task, cpu) = idle;
535 early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); 536 early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
536 irq_ctx_init(cpu); 537 irq_ctx_init(cpu);
@@ -1748,6 +1749,7 @@ static void __init voyager_smp_prepare_cpus(unsigned int max_cpus)
1748static void __cpuinit voyager_smp_prepare_boot_cpu(void) 1749static void __cpuinit voyager_smp_prepare_boot_cpu(void)
1749{ 1750{
1750 init_gdt(smp_processor_id()); 1751 init_gdt(smp_processor_id());
1752 per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
1751 switch_to_new_gdt(); 1753 switch_to_new_gdt();
1752 1754
1753 cpu_set(smp_processor_id(), cpu_online_map); 1755 cpu_set(smp_processor_id(), cpu_online_map);