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authorRalf Baechle <ralf@linux-mips.org>2006-04-05 04:45:45 -0400
committerRalf Baechle <ralf@linux-mips.org>2006-04-18 22:14:28 -0400
commit41c594ab65fc89573af296d192aa5235d09717ab (patch)
tree562462512a320f386bdf49eabfbb26bb3ee761fa /include
parent2600990e640e3bef29ed89d565864cf16ee83833 (diff)
[MIPS] MT: Improved multithreading support.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-mips/asmmacro.h47
-rw-r--r--include/asm-mips/cpu-info.h10
-rw-r--r--include/asm-mips/hazards.h2
-rw-r--r--include/asm-mips/interrupt.h65
-rw-r--r--include/asm-mips/irq.h29
-rw-r--r--include/asm-mips/mips_mt.h15
-rw-r--r--include/asm-mips/mipsmtregs.h11
-rw-r--r--include/asm-mips/mipsregs.h133
-rw-r--r--include/asm-mips/mmu_context.h112
-rw-r--r--include/asm-mips/processor.h6
-rw-r--r--include/asm-mips/ptrace.h4
-rw-r--r--include/asm-mips/r4kcache.h128
-rw-r--r--include/asm-mips/smtc.h55
-rw-r--r--include/asm-mips/smtc_ipi.h118
-rw-r--r--include/asm-mips/smtc_proc.h23
-rw-r--r--include/asm-mips/stackframe.h187
16 files changed, 924 insertions, 21 deletions
diff --git a/include/asm-mips/asmmacro.h b/include/asm-mips/asmmacro.h
index 30b18ea6cb11..f54aa147ec19 100644
--- a/include/asm-mips/asmmacro.h
+++ b/include/asm-mips/asmmacro.h
@@ -17,7 +17,26 @@
17#ifdef CONFIG_64BIT 17#ifdef CONFIG_64BIT
18#include <asm/asmmacro-64.h> 18#include <asm/asmmacro-64.h>
19#endif 19#endif
20#ifdef CONFIG_MIPS_MT_SMTC
21#include <asm/mipsmtregs.h>
22#endif
20 23
24#ifdef CONFIG_MIPS_MT_SMTC
25 .macro local_irq_enable reg=t0
26 mfc0 \reg, CP0_TCSTATUS
27 ori \reg, \reg, TCSTATUS_IXMT
28 xori \reg, \reg, TCSTATUS_IXMT
29 mtc0 \reg, CP0_TCSTATUS
30 ehb
31 .endm
32
33 .macro local_irq_disable reg=t0
34 mfc0 \reg, CP0_TCSTATUS
35 ori \reg, \reg, TCSTATUS_IXMT
36 mtc0 \reg, CP0_TCSTATUS
37 ehb
38 .endm
39#else
21 .macro local_irq_enable reg=t0 40 .macro local_irq_enable reg=t0
22 mfc0 \reg, CP0_STATUS 41 mfc0 \reg, CP0_STATUS
23 ori \reg, \reg, 1 42 ori \reg, \reg, 1
@@ -32,6 +51,7 @@
32 mtc0 \reg, CP0_STATUS 51 mtc0 \reg, CP0_STATUS
33 irq_disable_hazard 52 irq_disable_hazard
34 .endm 53 .endm
54#endif /* CONFIG_MIPS_MT_SMTC */
35 55
36#ifdef CONFIG_CPU_SB1 56#ifdef CONFIG_CPU_SB1
37 .macro fpu_enable_hazard 57 .macro fpu_enable_hazard
@@ -48,4 +68,31 @@
48 .endm 68 .endm
49#endif 69#endif
50 70
71/*
72 * Temporary until all gas have MT ASE support
73 */
74 .macro DMT reg=0
75 .word (0x41600bc1 | (\reg << 16))
76 .endm
77
78 .macro EMT reg=0
79 .word (0x41600be1 | (\reg << 16))
80 .endm
81
82 .macro DVPE reg=0
83 .word (0x41600001 | (\reg << 16))
84 .endm
85
86 .macro EVPE reg=0
87 .word (0x41600021 | (\reg << 16))
88 .endm
89
90 .macro MFTR rt=0, rd=0, u=0, sel=0
91 .word (0x41000000 | (\rt << 16) | (\rd << 11) | (\u << 5) | (\sel))
92 .endm
93
94 .macro MTTR rt=0, rd=0, u=0, sel=0
95 .word (0x41800000 | (\rt << 16) | (\rd << 11) | (\u << 5) | (\sel))
96 .endm
97
51#endif /* _ASM_ASMMACRO_H */ 98#endif /* _ASM_ASMMACRO_H */
diff --git a/include/asm-mips/cpu-info.h b/include/asm-mips/cpu-info.h
index 140be1c67da7..6572ac703662 100644
--- a/include/asm-mips/cpu-info.h
+++ b/include/asm-mips/cpu-info.h
@@ -73,6 +73,16 @@ struct cpuinfo_mips {
73 struct cache_desc dcache; /* Primary D or combined I/D cache */ 73 struct cache_desc dcache; /* Primary D or combined I/D cache */
74 struct cache_desc scache; /* Secondary cache */ 74 struct cache_desc scache; /* Secondary cache */
75 struct cache_desc tcache; /* Tertiary/split secondary cache */ 75 struct cache_desc tcache; /* Tertiary/split secondary cache */
76#if defined(CONFIG_MIPS_MT_SMTC)
77 /*
78 * In the MIPS MT "SMTC" model, each TC is considered
79 * to be a "CPU" for the purposes of scheduling, but
80 * exception resources, ASID spaces, etc, are common
81 * to all TCs within the same VPE.
82 */
83 int vpe_id; /* Virtual Processor number */
84 int tc_id; /* Thread Context number */
85#endif /* CONFIG_MIPS_MT */
76 void *data; /* Additional data */ 86 void *data; /* Additional data */
77} __attribute__((aligned(SMP_CACHE_BYTES))); 87} __attribute__((aligned(SMP_CACHE_BYTES)));
78 88
diff --git a/include/asm-mips/hazards.h b/include/asm-mips/hazards.h
index feb29a793888..dadc05188db7 100644
--- a/include/asm-mips/hazards.h
+++ b/include/asm-mips/hazards.h
@@ -284,6 +284,8 @@ do { \
284#define instruction_hazard() do { } while (0) 284#define instruction_hazard() do { } while (0)
285#endif 285#endif
286 286
287extern void mips_ihb(void);
288
287#endif /* __ASSEMBLY__ */ 289#endif /* __ASSEMBLY__ */
288 290
289#endif /* _ASM_HAZARDS_H */ 291#endif /* _ASM_HAZARDS_H */
diff --git a/include/asm-mips/interrupt.h b/include/asm-mips/interrupt.h
index 774348734fa0..4bb9c06f4410 100644
--- a/include/asm-mips/interrupt.h
+++ b/include/asm-mips/interrupt.h
@@ -19,7 +19,12 @@ __asm__ (
19 " .set push \n" 19 " .set push \n"
20 " .set reorder \n" 20 " .set reorder \n"
21 " .set noat \n" 21 " .set noat \n"
22#ifdef CONFIG_CPU_MIPSR2 22#ifdef CONFIG_MIPS_MT_SMTC
23 " mfc0 $1, $2, 1 # SMTC - clear TCStatus.IXMT \n"
24 " ori $1, 0x400 \n"
25 " xori $1, 0x400 \n"
26 " mtc0 $1, $2, 1 \n"
27#elif defined(CONFIG_CPU_MIPSR2)
23 " ei \n" 28 " ei \n"
24#else 29#else
25 " mfc0 $1,$12 \n" 30 " mfc0 $1,$12 \n"
@@ -62,7 +67,12 @@ __asm__ (
62 " .macro local_irq_disable\n" 67 " .macro local_irq_disable\n"
63 " .set push \n" 68 " .set push \n"
64 " .set noat \n" 69 " .set noat \n"
65#ifdef CONFIG_CPU_MIPSR2 70#ifdef CONFIG_MIPS_MT_SMTC
71 " mfc0 $1, $2, 1 \n"
72 " ori $1, 0x400 \n"
73 " .set noreorder \n"
74 " mtc0 $1, $2, 1 \n"
75#elif defined(CONFIG_CPU_MIPSR2)
66 " di \n" 76 " di \n"
67#else 77#else
68 " mfc0 $1,$12 \n" 78 " mfc0 $1,$12 \n"
@@ -88,7 +98,11 @@ __asm__ (
88 " .macro local_save_flags flags \n" 98 " .macro local_save_flags flags \n"
89 " .set push \n" 99 " .set push \n"
90 " .set reorder \n" 100 " .set reorder \n"
101#ifdef CONFIG_MIPS_MT_SMTC
102 " mfc0 \\flags, $2, 1 \n"
103#else
91 " mfc0 \\flags, $12 \n" 104 " mfc0 \\flags, $12 \n"
105#endif
92 " .set pop \n" 106 " .set pop \n"
93 " .endm \n"); 107 " .endm \n");
94 108
@@ -102,7 +116,13 @@ __asm__ (
102 " .set push \n" 116 " .set push \n"
103 " .set reorder \n" 117 " .set reorder \n"
104 " .set noat \n" 118 " .set noat \n"
105#ifdef CONFIG_CPU_MIPSR2 119#ifdef CONFIG_MIPS_MT_SMTC
120 " mfc0 \\result, $2, 1 \n"
121 " ori $1, \\result, 0x400 \n"
122 " .set noreorder \n"
123 " mtc0 $1, $2, 1 \n"
124 " andi \\result, \\result, 0x400 \n"
125#elif defined(CONFIG_CPU_MIPSR2)
106 " di \\result \n" 126 " di \\result \n"
107 " andi \\result, 1 \n" 127 " andi \\result, 1 \n"
108#else 128#else
@@ -128,7 +148,14 @@ __asm__ (
128 " .set push \n" 148 " .set push \n"
129 " .set noreorder \n" 149 " .set noreorder \n"
130 " .set noat \n" 150 " .set noat \n"
131#if defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU) 151#ifdef CONFIG_MIPS_MT_SMTC
152 "mfc0 $1, $2, 1 \n"
153 "andi \\flags, 0x400 \n"
154 "ori $1, 0x400 \n"
155 "xori $1, 0x400 \n"
156 "or \\flags, $1 \n"
157 "mtc0 \\flags, $2, 1 \n"
158#elif defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
132 /* 159 /*
133 * Slow, but doesn't suffer from a relativly unlikely race 160 * Slow, but doesn't suffer from a relativly unlikely race
134 * condition we're having since days 1. 161 * condition we're having since days 1.
@@ -167,11 +194,29 @@ do { \
167 : "memory"); \ 194 : "memory"); \
168} while(0) 195} while(0)
169 196
170#define irqs_disabled() \ 197static inline int irqs_disabled(void)
171({ \ 198{
172 unsigned long flags; \ 199#ifdef CONFIG_MIPS_MT_SMTC
173 local_save_flags(flags); \ 200 /*
174 !(flags & 1); \ 201 * SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU
175}) 202 */
203 unsigned long __result;
204
205 __asm__ __volatile__(
206 " .set noreorder \n"
207 " mfc0 %0, $2, 1 \n"
208 " andi %0, 0x400 \n"
209 " slt %0, $0, %0 \n"
210 " .set reorder \n"
211 : "=r" (__result));
212
213 return __result;
214#else
215 unsigned long flags;
216 local_save_flags(flags);
217
218 return !(flags & 1);
219#endif
220}
176 221
177#endif /* _ASM_INTERRUPT_H */ 222#endif /* _ASM_INTERRUPT_H */
diff --git a/include/asm-mips/irq.h b/include/asm-mips/irq.h
index d7aecca3b95f..dde677f02bc0 100644
--- a/include/asm-mips/irq.h
+++ b/include/asm-mips/irq.h
@@ -11,6 +11,9 @@
11 11
12#include <linux/config.h> 12#include <linux/config.h>
13#include <linux/linkage.h> 13#include <linux/linkage.h>
14
15#include <asm/mipsmtregs.h>
16
14#include <irq.h> 17#include <irq.h>
15 18
16#ifdef CONFIG_I8259 19#ifdef CONFIG_I8259
@@ -26,6 +29,23 @@ struct pt_regs;
26 29
27extern asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs); 30extern asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs);
28 31
32#ifdef CONFIG_MIPS_MT_SMTC
33/*
34 * Clear interrupt mask handling "backstop" if irq_hwmask
35 * entry so indicates. This implies that the ack() or end()
36 * functions will take over re-enabling the low-level mask.
37 * Otherwise it will be done on return from exception.
38 */
39#define __DO_IRQ_SMTC_HOOK() \
40do { \
41 if (irq_hwmask[irq] & 0x0000ff00) \
42 write_c0_tccontext(read_c0_tccontext() & \
43 ~(irq_hwmask[irq] & 0x0000ff00)); \
44} while (0)
45#else
46#define __DO_IRQ_SMTC_HOOK() do { } while (0)
47#endif
48
29#ifdef CONFIG_PREEMPT 49#ifdef CONFIG_PREEMPT
30 50
31/* 51/*
@@ -39,6 +59,7 @@ extern asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs);
39#define do_IRQ(irq, regs) \ 59#define do_IRQ(irq, regs) \
40do { \ 60do { \
41 irq_enter(); \ 61 irq_enter(); \
62 __DO_IRQ_SMTC_HOOK(); \
42 __do_IRQ((irq), (regs)); \ 63 __do_IRQ((irq), (regs)); \
43 irq_exit(); \ 64 irq_exit(); \
44} while (0) 65} while (0)
@@ -48,4 +69,12 @@ do { \
48extern void arch_init_irq(void); 69extern void arch_init_irq(void);
49extern void spurious_interrupt(struct pt_regs *regs); 70extern void spurious_interrupt(struct pt_regs *regs);
50 71
72#ifdef CONFIG_MIPS_MT_SMTC
73struct irqaction;
74
75extern unsigned long irq_hwmask[];
76extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
77 unsigned long hwmask);
78#endif /* CONFIG_MIPS_MT_SMTC */
79
51#endif /* _ASM_IRQ_H */ 80#endif /* _ASM_IRQ_H */
diff --git a/include/asm-mips/mips_mt.h b/include/asm-mips/mips_mt.h
new file mode 100644
index 000000000000..c31a312b9783
--- /dev/null
+++ b/include/asm-mips/mips_mt.h
@@ -0,0 +1,15 @@
1/*
2 * Definitions and decalrations for MIPS MT support
3 * that are common between SMTC, VSMP, and/or AP/SP
4 * kernel models.
5 */
6#ifndef __ASM_MIPS_MT_H
7#define __ASM_MIPS_MT_H
8
9extern cpumask_t mt_fpu_cpumask;
10extern unsigned long mt_fpemul_threshold;
11
12extern void mips_mt_regdump(unsigned long previous_mvpcontrol_value);
13extern void mips_mt_set_cpuoptions(void);
14
15#endif /* __ASM_MIPS_MT_H */
diff --git a/include/asm-mips/mipsmtregs.h b/include/asm-mips/mipsmtregs.h
index a5ac1a62f4f4..f637ce70758f 100644
--- a/include/asm-mips/mipsmtregs.h
+++ b/include/asm-mips/mipsmtregs.h
@@ -165,7 +165,7 @@
165 165
166#ifndef __ASSEMBLY__ 166#ifndef __ASSEMBLY__
167 167
168extern void mips_mt_regdump(void); 168extern void mips_mt_regdump(unsigned long previous_mvpcontrol_value);
169 169
170static inline unsigned int dvpe(void) 170static inline unsigned int dvpe(void)
171{ 171{
@@ -282,8 +282,11 @@ static inline void ehb(void)
282 \ 282 \
283 __asm__ __volatile__( \ 283 __asm__ __volatile__( \
284 " .set push \n" \ 284 " .set push \n" \
285 " .set noat \n" \
285 " .set mips32r2 \n" \ 286 " .set mips32r2 \n" \
286 " mftgpr %0," #rt " \n" \ 287 " # mftgpr $1," #rt " \n" \
288 " .word 0x41000820 | (" #rt " << 16) \n" \
289 " move %0, $1 \n" \
287 " .set pop \n" \ 290 " .set pop \n" \
288 : "=r" (__res)); \ 291 : "=r" (__res)); \
289 \ 292 \
@@ -295,9 +298,7 @@ static inline void ehb(void)
295 unsigned long __res; \ 298 unsigned long __res; \
296 \ 299 \
297 __asm__ __volatile__( \ 300 __asm__ __volatile__( \
298 ".set noat\n\t" \ 301 " mftr %0, " #rt ", " #u ", " #sel " \n" \
299 "mftr\t%0, " #rt ", " #u ", " #sel "\n\t" \
300 ".set at\n\t" \
301 : "=r" (__res)); \ 302 : "=r" (__res)); \
302 \ 303 \
303 __res; \ 304 __res; \
diff --git a/include/asm-mips/mipsregs.h b/include/asm-mips/mipsregs.h
index e85a42e2ea0c..a2ef579f6b1a 100644
--- a/include/asm-mips/mipsregs.h
+++ b/include/asm-mips/mipsregs.h
@@ -861,7 +861,19 @@ do { \
861#define write_c0_compare3(val) __write_32bit_c0_register($11, 7, val) 861#define write_c0_compare3(val) __write_32bit_c0_register($11, 7, val)
862 862
863#define read_c0_status() __read_32bit_c0_register($12, 0) 863#define read_c0_status() __read_32bit_c0_register($12, 0)
864#ifdef CONFIG_MIPS_MT_SMTC
865#define write_c0_status(val) \
866do { \
867 __write_32bit_c0_register($12, 0, val); \
868 __ehb(); \
869} while (0)
870#else
871/*
872 * Legacy non-SMTC code, which may be hazardous
873 * but which might not support EHB
874 */
864#define write_c0_status(val) __write_32bit_c0_register($12, 0, val) 875#define write_c0_status(val) __write_32bit_c0_register($12, 0, val)
876#endif /* CONFIG_MIPS_MT_SMTC */
865 877
866#define read_c0_cause() __read_32bit_c0_register($13, 0) 878#define read_c0_cause() __read_32bit_c0_register($13, 0)
867#define write_c0_cause(val) __write_32bit_c0_register($13, 0, val) 879#define write_c0_cause(val) __write_32bit_c0_register($13, 0, val)
@@ -1004,6 +1016,9 @@ do { \
1004#define read_c0_taglo() __read_32bit_c0_register($28, 0) 1016#define read_c0_taglo() __read_32bit_c0_register($28, 0)
1005#define write_c0_taglo(val) __write_32bit_c0_register($28, 0, val) 1017#define write_c0_taglo(val) __write_32bit_c0_register($28, 0, val)
1006 1018
1019#define read_c0_dtaglo() __read_32bit_c0_register($28, 2)
1020#define write_c0_dtaglo(val) __write_32bit_c0_register($28, 2, val)
1021
1007#define read_c0_taghi() __read_32bit_c0_register($29, 0) 1022#define read_c0_taghi() __read_32bit_c0_register($29, 0)
1008#define write_c0_taghi(val) __write_32bit_c0_register($29, 0, val) 1023#define write_c0_taghi(val) __write_32bit_c0_register($29, 0, val)
1009 1024
@@ -1357,6 +1372,11 @@ static inline void tlb_write_random(void)
1357/* 1372/*
1358 * Manipulate bits in a c0 register. 1373 * Manipulate bits in a c0 register.
1359 */ 1374 */
1375#ifndef CONFIG_MIPS_MT_SMTC
1376/*
1377 * SMTC Linux requires shutting-down microthread scheduling
1378 * during CP0 register read-modify-write sequences.
1379 */
1360#define __BUILD_SET_C0(name) \ 1380#define __BUILD_SET_C0(name) \
1361static inline unsigned int \ 1381static inline unsigned int \
1362set_c0_##name(unsigned int set) \ 1382set_c0_##name(unsigned int set) \
@@ -1395,6 +1415,119 @@ change_c0_##name(unsigned int change, unsigned int new) \
1395 return res; \ 1415 return res; \
1396} 1416}
1397 1417
1418#else /* SMTC versions that manage MT scheduling */
1419
1420#include <asm/interrupt.h>
1421
1422/*
1423 * This is a duplicate of dmt() in mipsmtregs.h to avoid problems with
1424 * header file recursion.
1425 */
1426static inline unsigned int __dmt(void)
1427{
1428 int res;
1429
1430 __asm__ __volatile__(
1431 " .set push \n"
1432 " .set mips32r2 \n"
1433 " .set noat \n"
1434 " .word 0x41610BC1 # dmt $1 \n"
1435 " ehb \n"
1436 " move %0, $1 \n"
1437 " .set pop \n"
1438 : "=r" (res));
1439
1440 instruction_hazard();
1441
1442 return res;
1443}
1444
1445#define __VPECONTROL_TE_SHIFT 15
1446#define __VPECONTROL_TE (1UL << __VPECONTROL_TE_SHIFT)
1447
1448#define __EMT_ENABLE __VPECONTROL_TE
1449
1450static inline void __emt(unsigned int previous)
1451{
1452 if ((previous & __EMT_ENABLE))
1453 __asm__ __volatile__(
1454 " .set noreorder \n"
1455 " .set mips32r2 \n"
1456 " .word 0x41600be1 # emt \n"
1457 " ehb \n"
1458 " .set mips0 \n"
1459 " .set reorder \n");
1460}
1461
1462static inline void __ehb(void)
1463{
1464 __asm__ __volatile__(
1465 " ehb \n");
1466}
1467
1468/*
1469 * Note that local_irq_save/restore affect TC-specific IXMT state,
1470 * not Status.IE as in non-SMTC kernel.
1471 */
1472
1473#define __BUILD_SET_C0(name) \
1474static inline unsigned int \
1475set_c0_##name(unsigned int set) \
1476{ \
1477 unsigned int res; \
1478 unsigned int omt; \
1479 unsigned int flags; \
1480 \
1481 local_irq_save(flags); \
1482 omt = __dmt(); \
1483 res = read_c0_##name(); \
1484 res |= set; \
1485 write_c0_##name(res); \
1486 __emt(omt); \
1487 local_irq_restore(flags); \
1488 \
1489 return res; \
1490} \
1491 \
1492static inline unsigned int \
1493clear_c0_##name(unsigned int clear) \
1494{ \
1495 unsigned int res; \
1496 unsigned int omt; \
1497 unsigned int flags; \
1498 \
1499 local_irq_save(flags); \
1500 omt = __dmt(); \
1501 res = read_c0_##name(); \
1502 res &= ~clear; \
1503 write_c0_##name(res); \
1504 __emt(omt); \
1505 local_irq_restore(flags); \
1506 \
1507 return res; \
1508} \
1509 \
1510static inline unsigned int \
1511change_c0_##name(unsigned int change, unsigned int new) \
1512{ \
1513 unsigned int res; \
1514 unsigned int omt; \
1515 unsigned int flags; \
1516 \
1517 local_irq_save(flags); \
1518 \
1519 omt = __dmt(); \
1520 res = read_c0_##name(); \
1521 res &= ~change; \
1522 res |= (new & change); \
1523 write_c0_##name(res); \
1524 __emt(omt); \
1525 local_irq_restore(flags); \
1526 \
1527 return res; \
1528}
1529#endif
1530
1398__BUILD_SET_C0(status) 1531__BUILD_SET_C0(status)
1399__BUILD_SET_C0(cause) 1532__BUILD_SET_C0(cause)
1400__BUILD_SET_C0(config) 1533__BUILD_SET_C0(config)
diff --git a/include/asm-mips/mmu_context.h b/include/asm-mips/mmu_context.h
index 61cf22588137..6e09f4c87211 100644
--- a/include/asm-mips/mmu_context.h
+++ b/include/asm-mips/mmu_context.h
@@ -17,6 +17,10 @@
17#include <linux/slab.h> 17#include <linux/slab.h>
18#include <asm/cacheflush.h> 18#include <asm/cacheflush.h>
19#include <asm/tlbflush.h> 19#include <asm/tlbflush.h>
20#ifdef CONFIG_MIPS_MT_SMTC
21#include <asm/mipsmtregs.h>
22#include <asm/smtc.h>
23#endif /* SMTC */
20 24
21/* 25/*
22 * For the fast tlb miss handlers, we keep a per cpu array of pointers 26 * For the fast tlb miss handlers, we keep a per cpu array of pointers
@@ -54,6 +58,14 @@ extern unsigned long pgd_current[];
54#define ASID_INC 0x1 58#define ASID_INC 0x1
55#define ASID_MASK 0xfff 59#define ASID_MASK 0xfff
56 60
61/* SMTC/34K debug hack - but maybe we'll keep it */
62#elif defined(CONFIG_MIPS_MT_SMTC)
63
64#define ASID_INC 0x1
65extern unsigned long smtc_asid_mask;
66#define ASID_MASK (smtc_asid_mask)
67#define HW_ASID_MASK 0xff
68/* End SMTC/34K debug hack */
57#else /* FIXME: not correct for R6000 */ 69#else /* FIXME: not correct for R6000 */
58 70
59#define ASID_INC 0x1 71#define ASID_INC 0x1
@@ -76,6 +88,8 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
76#define ASID_VERSION_MASK ((unsigned long)~(ASID_MASK|(ASID_MASK-1))) 88#define ASID_VERSION_MASK ((unsigned long)~(ASID_MASK|(ASID_MASK-1)))
77#define ASID_FIRST_VERSION ((unsigned long)(~ASID_VERSION_MASK) + 1) 89#define ASID_FIRST_VERSION ((unsigned long)(~ASID_VERSION_MASK) + 1)
78 90
91#ifndef CONFIG_MIPS_MT_SMTC
92/* Normal, classic MIPS get_new_mmu_context */
79static inline void 93static inline void
80get_new_mmu_context(struct mm_struct *mm, unsigned long cpu) 94get_new_mmu_context(struct mm_struct *mm, unsigned long cpu)
81{ 95{
@@ -91,6 +105,12 @@ get_new_mmu_context(struct mm_struct *mm, unsigned long cpu)
91 cpu_context(cpu, mm) = asid_cache(cpu) = asid; 105 cpu_context(cpu, mm) = asid_cache(cpu) = asid;
92} 106}
93 107
108#else /* CONFIG_MIPS_MT_SMTC */
109
110#define get_new_mmu_context(mm,cpu) smtc_get_new_mmu_context((mm),(cpu))
111
112#endif /* CONFIG_MIPS_MT_SMTC */
113
94/* 114/*
95 * Initialize the context related info for a new mm_struct 115 * Initialize the context related info for a new mm_struct
96 * instance. 116 * instance.
@@ -111,14 +131,46 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
111{ 131{
112 unsigned int cpu = smp_processor_id(); 132 unsigned int cpu = smp_processor_id();
113 unsigned long flags; 133 unsigned long flags;
114 134#ifdef CONFIG_MIPS_MT_SMTC
135 unsigned long oldasid;
136 unsigned long mtflags;
137 int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id;
115 local_irq_save(flags); 138 local_irq_save(flags);
139 mtflags = dvpe();
140#else /* Not SMTC */
141 local_irq_save(flags);
142#endif /* CONFIG_MIPS_MT_SMTC */
116 143
117 /* Check if our ASID is of an older version and thus invalid */ 144 /* Check if our ASID is of an older version and thus invalid */
118 if ((cpu_context(cpu, next) ^ asid_cache(cpu)) & ASID_VERSION_MASK) 145 if ((cpu_context(cpu, next) ^ asid_cache(cpu)) & ASID_VERSION_MASK)
119 get_new_mmu_context(next, cpu); 146 get_new_mmu_context(next, cpu);
120 147#ifdef CONFIG_MIPS_MT_SMTC
148 /*
149 * If the EntryHi ASID being replaced happens to be
150 * the value flagged at ASID recycling time as having
151 * an extended life, clear the bit showing it being
152 * in use by this "CPU", and if that's the last bit,
153 * free up the ASID value for use and flush any old
154 * instances of it from the TLB.
155 */
156 oldasid = (read_c0_entryhi() & ASID_MASK);
157 if(smtc_live_asid[mytlb][oldasid]) {
158 smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
159 if(smtc_live_asid[mytlb][oldasid] == 0)
160 smtc_flush_tlb_asid(oldasid);
161 }
162 /*
163 * Tread softly on EntryHi, and so long as we support
164 * having ASID_MASK smaller than the hardware maximum,
165 * make sure no "soft" bits become "hard"...
166 */
167 write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK)
168 | (cpu_context(cpu, next) & ASID_MASK));
169 ehb(); /* Make sure it propagates to TCStatus */
170 evpe(mtflags);
171#else
121 write_c0_entryhi(cpu_context(cpu, next)); 172 write_c0_entryhi(cpu_context(cpu, next));
173#endif /* CONFIG_MIPS_MT_SMTC */
122 TLBMISS_HANDLER_SETUP_PGD(next->pgd); 174 TLBMISS_HANDLER_SETUP_PGD(next->pgd);
123 175
124 /* 176 /*
@@ -151,12 +203,34 @@ activate_mm(struct mm_struct *prev, struct mm_struct *next)
151 unsigned long flags; 203 unsigned long flags;
152 unsigned int cpu = smp_processor_id(); 204 unsigned int cpu = smp_processor_id();
153 205
206#ifdef CONFIG_MIPS_MT_SMTC
207 unsigned long oldasid;
208 unsigned long mtflags;
209 int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id;
210#endif /* CONFIG_MIPS_MT_SMTC */
211
154 local_irq_save(flags); 212 local_irq_save(flags);
155 213
156 /* Unconditionally get a new ASID. */ 214 /* Unconditionally get a new ASID. */
157 get_new_mmu_context(next, cpu); 215 get_new_mmu_context(next, cpu);
158 216
217#ifdef CONFIG_MIPS_MT_SMTC
218 /* See comments for similar code above */
219 mtflags = dvpe();
220 oldasid = read_c0_entryhi() & ASID_MASK;
221 if(smtc_live_asid[mytlb][oldasid]) {
222 smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
223 if(smtc_live_asid[mytlb][oldasid] == 0)
224 smtc_flush_tlb_asid(oldasid);
225 }
226 /* See comments for similar code above */
227 write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) |
228 (cpu_context(cpu, next) & ASID_MASK));
229 ehb(); /* Make sure it propagates to TCStatus */
230 evpe(mtflags);
231#else
159 write_c0_entryhi(cpu_context(cpu, next)); 232 write_c0_entryhi(cpu_context(cpu, next));
233#endif /* CONFIG_MIPS_MT_SMTC */
160 TLBMISS_HANDLER_SETUP_PGD(next->pgd); 234 TLBMISS_HANDLER_SETUP_PGD(next->pgd);
161 235
162 /* mark mmu ownership change */ 236 /* mark mmu ownership change */
@@ -174,17 +248,49 @@ static inline void
174drop_mmu_context(struct mm_struct *mm, unsigned cpu) 248drop_mmu_context(struct mm_struct *mm, unsigned cpu)
175{ 249{
176 unsigned long flags; 250 unsigned long flags;
251#ifdef CONFIG_MIPS_MT_SMTC
252 unsigned long oldasid;
253 /* Can't use spinlock because called from TLB flush within DVPE */
254 unsigned int prevvpe;
255 int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id;
256#endif /* CONFIG_MIPS_MT_SMTC */
177 257
178 local_irq_save(flags); 258 local_irq_save(flags);
179 259
180 if (cpu_isset(cpu, mm->cpu_vm_mask)) { 260 if (cpu_isset(cpu, mm->cpu_vm_mask)) {
181 get_new_mmu_context(mm, cpu); 261 get_new_mmu_context(mm, cpu);
262#ifdef CONFIG_MIPS_MT_SMTC
263 /* See comments for similar code above */
264 prevvpe = dvpe();
265 oldasid = (read_c0_entryhi() & ASID_MASK);
266 if(smtc_live_asid[mytlb][oldasid]) {
267 smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
268 if(smtc_live_asid[mytlb][oldasid] == 0)
269 smtc_flush_tlb_asid(oldasid);
270 }
271 /* See comments for similar code above */
272 write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK)
273 | cpu_asid(cpu, mm));
274 ehb(); /* Make sure it propagates to TCStatus */
275 evpe(prevvpe);
276#else /* not CONFIG_MIPS_MT_SMTC */
182 write_c0_entryhi(cpu_asid(cpu, mm)); 277 write_c0_entryhi(cpu_asid(cpu, mm));
278#endif /* CONFIG_MIPS_MT_SMTC */
183 } else { 279 } else {
184 /* will get a new context next time */ 280 /* will get a new context next time */
281#ifndef CONFIG_MIPS_MT_SMTC
185 cpu_context(cpu, mm) = 0; 282 cpu_context(cpu, mm) = 0;
283#else /* SMTC */
284 int i;
285
286 /* SMTC shares the TLB (and ASIDs) across VPEs */
287 for (i = 0; i < num_online_cpus(); i++) {
288 if((smtc_status & SMTC_TLB_SHARED)
289 || (cpu_data[i].vpe_id == cpu_data[cpu].vpe_id))
290 cpu_context(i, mm) = 0;
291 }
292#endif /* CONFIG_MIPS_MT_SMTC */
186 } 293 }
187
188 local_irq_restore(flags); 294 local_irq_restore(flags);
189} 295}
190 296
diff --git a/include/asm-mips/processor.h b/include/asm-mips/processor.h
index 39d2bd50fece..786651340de1 100644
--- a/include/asm-mips/processor.h
+++ b/include/asm-mips/processor.h
@@ -12,6 +12,7 @@
12#define _ASM_PROCESSOR_H 12#define _ASM_PROCESSOR_H
13 13
14#include <linux/config.h> 14#include <linux/config.h>
15#include <linux/cpumask.h>
15#include <linux/threads.h> 16#include <linux/threads.h>
16 17
17#include <asm/cachectl.h> 18#include <asm/cachectl.h>
@@ -107,6 +108,10 @@ struct mips_dsp_state {
107 108
108#define INIT_DSP {{0,},} 109#define INIT_DSP {{0,},}
109 110
111#define INIT_CPUMASK { \
112 {0,} \
113}
114
110typedef struct { 115typedef struct {
111 unsigned long seg; 116 unsigned long seg;
112} mm_segment_t; 117} mm_segment_t;
@@ -142,6 +147,7 @@ struct thread_struct {
142#define MF_LOGADE 2 /* Log address errors to syslog */ 147#define MF_LOGADE 2 /* Log address errors to syslog */
143#define MF_32BIT_REGS 4 /* also implies 16/32 fprs */ 148#define MF_32BIT_REGS 4 /* also implies 16/32 fprs */
144#define MF_32BIT_ADDR 8 /* 32-bit address space (o32/n32) */ 149#define MF_32BIT_ADDR 8 /* 32-bit address space (o32/n32) */
150#define MF_FPUBOUND 0x10 /* thread bound to FPU-full CPU set */
145 unsigned long mflags; 151 unsigned long mflags;
146 unsigned long irix_trampoline; /* Wheee... */ 152 unsigned long irix_trampoline; /* Wheee... */
147 unsigned long irix_oldctx; 153 unsigned long irix_oldctx;
diff --git a/include/asm-mips/ptrace.h b/include/asm-mips/ptrace.h
index 95c5839ac465..fa9d8713c12a 100644
--- a/include/asm-mips/ptrace.h
+++ b/include/asm-mips/ptrace.h
@@ -45,6 +45,10 @@ struct pt_regs {
45 unsigned long cp0_badvaddr; 45 unsigned long cp0_badvaddr;
46 unsigned long cp0_cause; 46 unsigned long cp0_cause;
47 unsigned long cp0_epc; 47 unsigned long cp0_epc;
48#ifdef CONFIG_MIPS_MT_SMTC
49 unsigned long cp0_tcstatus;
50 unsigned long smtc_pad;
51#endif /* CONFIG_MIPS_MT_SMTC */
48}; 52};
49 53
50/* Arbitrarily choose the same ptrace numbers as used by the Sparc code. */ 54/* Arbitrarily choose the same ptrace numbers as used by the Sparc code. */
diff --git a/include/asm-mips/r4kcache.h b/include/asm-mips/r4kcache.h
index 2f2eb95387f6..3c8e3c8d1a9a 100644
--- a/include/asm-mips/r4kcache.h
+++ b/include/asm-mips/r4kcache.h
@@ -15,6 +15,7 @@
15#include <asm/asm.h> 15#include <asm/asm.h>
16#include <asm/cacheops.h> 16#include <asm/cacheops.h>
17#include <asm/cpu-features.h> 17#include <asm/cpu-features.h>
18#include <asm/mipsmtregs.h>
18 19
19/* 20/*
20 * This macro return a properly sign-extended address suitable as base address 21 * This macro return a properly sign-extended address suitable as base address
@@ -39,14 +40,118 @@
39 : \ 40 : \
40 : "i" (op), "R" (*(unsigned char *)(addr))) 41 : "i" (op), "R" (*(unsigned char *)(addr)))
41 42
43#ifdef CONFIG_MIPS_MT
44/*
45 * Temporary hacks for SMTC debug. Optionally force single-threaded
46 * execution during I-cache flushes.
47 */
48
49#define PROTECT_CACHE_FLUSHES 1
50
51#ifdef PROTECT_CACHE_FLUSHES
52
53extern int mt_protiflush;
54extern int mt_protdflush;
55extern void mt_cflush_lockdown(void);
56extern void mt_cflush_release(void);
57
58#define BEGIN_MT_IPROT \
59 unsigned long flags = 0; \
60 unsigned long mtflags = 0; \
61 if(mt_protiflush) { \
62 local_irq_save(flags); \
63 ehb(); \
64 mtflags = dvpe(); \
65 mt_cflush_lockdown(); \
66 }
67
68#define END_MT_IPROT \
69 if(mt_protiflush) { \
70 mt_cflush_release(); \
71 evpe(mtflags); \
72 local_irq_restore(flags); \
73 }
74
75#define BEGIN_MT_DPROT \
76 unsigned long flags = 0; \
77 unsigned long mtflags = 0; \
78 if(mt_protdflush) { \
79 local_irq_save(flags); \
80 ehb(); \
81 mtflags = dvpe(); \
82 mt_cflush_lockdown(); \
83 }
84
85#define END_MT_DPROT \
86 if(mt_protdflush) { \
87 mt_cflush_release(); \
88 evpe(mtflags); \
89 local_irq_restore(flags); \
90 }
91
92#else
93
94#define BEGIN_MT_IPROT
95#define BEGIN_MT_DPROT
96#define END_MT_IPROT
97#define END_MT_DPROT
98
99#endif /* PROTECT_CACHE_FLUSHES */
100
101#define __iflush_prologue \
102 unsigned long redundance; \
103 extern int mt_n_iflushes; \
104 BEGIN_MT_IPROT \
105 for (redundance = 0; redundance < mt_n_iflushes; redundance++) {
106
107#define __iflush_epilogue \
108 END_MT_IPROT \
109 }
110
111#define __dflush_prologue \
112 unsigned long redundance; \
113 extern int mt_n_dflushes; \
114 BEGIN_MT_DPROT \
115 for (redundance = 0; redundance < mt_n_dflushes; redundance++) {
116
117#define __dflush_epilogue \
118 END_MT_DPROT \
119 }
120
121#define __inv_dflush_prologue __dflush_prologue
122#define __inv_dflush_epilogue __dflush_epilogue
123#define __sflush_prologue {
124#define __sflush_epilogue }
125#define __inv_sflush_prologue __sflush_prologue
126#define __inv_sflush_epilogue __sflush_epilogue
127
128#else /* CONFIG_MIPS_MT */
129
130#define __iflush_prologue {
131#define __iflush_epilogue }
132#define __dflush_prologue {
133#define __dflush_epilogue }
134#define __inv_dflush_prologue {
135#define __inv_dflush_epilogue }
136#define __sflush_prologue {
137#define __sflush_epilogue }
138#define __inv_sflush_prologue {
139#define __inv_sflush_epilogue }
140
141#endif /* CONFIG_MIPS_MT */
142
42static inline void flush_icache_line_indexed(unsigned long addr) 143static inline void flush_icache_line_indexed(unsigned long addr)
43{ 144{
145 __iflush_prologue
44 cache_op(Index_Invalidate_I, addr); 146 cache_op(Index_Invalidate_I, addr);
147 __iflush_epilogue
45} 148}
46 149
47static inline void flush_dcache_line_indexed(unsigned long addr) 150static inline void flush_dcache_line_indexed(unsigned long addr)
48{ 151{
152 __dflush_prologue
49 cache_op(Index_Writeback_Inv_D, addr); 153 cache_op(Index_Writeback_Inv_D, addr);
154 __dflush_epilogue
50} 155}
51 156
52static inline void flush_scache_line_indexed(unsigned long addr) 157static inline void flush_scache_line_indexed(unsigned long addr)
@@ -56,17 +161,23 @@ static inline void flush_scache_line_indexed(unsigned long addr)
56 161
57static inline void flush_icache_line(unsigned long addr) 162static inline void flush_icache_line(unsigned long addr)
58{ 163{
164 __iflush_prologue
59 cache_op(Hit_Invalidate_I, addr); 165 cache_op(Hit_Invalidate_I, addr);
166 __iflush_epilogue
60} 167}
61 168
62static inline void flush_dcache_line(unsigned long addr) 169static inline void flush_dcache_line(unsigned long addr)
63{ 170{
171 __dflush_prologue
64 cache_op(Hit_Writeback_Inv_D, addr); 172 cache_op(Hit_Writeback_Inv_D, addr);
173 __dflush_epilogue
65} 174}
66 175
67static inline void invalidate_dcache_line(unsigned long addr) 176static inline void invalidate_dcache_line(unsigned long addr)
68{ 177{
178 __dflush_prologue
69 cache_op(Hit_Invalidate_D, addr); 179 cache_op(Hit_Invalidate_D, addr);
180 __dflush_epilogue
70} 181}
71 182
72static inline void invalidate_scache_line(unsigned long addr) 183static inline void invalidate_scache_line(unsigned long addr)
@@ -239,9 +350,13 @@ static inline void blast_##pfx##cache##lsize(void) \
239 current_cpu_data.desc.waybit; \ 350 current_cpu_data.desc.waybit; \
240 unsigned long ws, addr; \ 351 unsigned long ws, addr; \
241 \ 352 \
353 __##pfx##flush_prologue \
354 \
242 for (ws = 0; ws < ws_end; ws += ws_inc) \ 355 for (ws = 0; ws < ws_end; ws += ws_inc) \
243 for (addr = start; addr < end; addr += lsize * 32) \ 356 for (addr = start; addr < end; addr += lsize * 32) \
244 cache##lsize##_unroll32(addr|ws,indexop); \ 357 cache##lsize##_unroll32(addr|ws,indexop); \
358 \
359 __##pfx##flush_epilogue \
245} \ 360} \
246 \ 361 \
247static inline void blast_##pfx##cache##lsize##_page(unsigned long page) \ 362static inline void blast_##pfx##cache##lsize##_page(unsigned long page) \
@@ -249,10 +364,14 @@ static inline void blast_##pfx##cache##lsize##_page(unsigned long page) \
249 unsigned long start = page; \ 364 unsigned long start = page; \
250 unsigned long end = page + PAGE_SIZE; \ 365 unsigned long end = page + PAGE_SIZE; \
251 \ 366 \
367 __##pfx##flush_prologue \
368 \
252 do { \ 369 do { \
253 cache##lsize##_unroll32(start,hitop); \ 370 cache##lsize##_unroll32(start,hitop); \
254 start += lsize * 32; \ 371 start += lsize * 32; \
255 } while (start < end); \ 372 } while (start < end); \
373 \
374 __##pfx##flush_epilogue \
256} \ 375} \
257 \ 376 \
258static inline void blast_##pfx##cache##lsize##_page_indexed(unsigned long page) \ 377static inline void blast_##pfx##cache##lsize##_page_indexed(unsigned long page) \
@@ -265,9 +384,13 @@ static inline void blast_##pfx##cache##lsize##_page_indexed(unsigned long page)
265 current_cpu_data.desc.waybit; \ 384 current_cpu_data.desc.waybit; \
266 unsigned long ws, addr; \ 385 unsigned long ws, addr; \
267 \ 386 \
387 __##pfx##flush_prologue \
388 \
268 for (ws = 0; ws < ws_end; ws += ws_inc) \ 389 for (ws = 0; ws < ws_end; ws += ws_inc) \
269 for (addr = start; addr < end; addr += lsize * 32) \ 390 for (addr = start; addr < end; addr += lsize * 32) \
270 cache##lsize##_unroll32(addr|ws,indexop); \ 391 cache##lsize##_unroll32(addr|ws,indexop); \
392 \
393 __##pfx##flush_epilogue \
271} 394}
272 395
273__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 16) 396__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 16)
@@ -288,12 +411,17 @@ static inline void prot##blast_##pfx##cache##_range(unsigned long start, \
288 unsigned long lsize = cpu_##desc##_line_size(); \ 411 unsigned long lsize = cpu_##desc##_line_size(); \
289 unsigned long addr = start & ~(lsize - 1); \ 412 unsigned long addr = start & ~(lsize - 1); \
290 unsigned long aend = (end - 1) & ~(lsize - 1); \ 413 unsigned long aend = (end - 1) & ~(lsize - 1); \
414 \
415 __##pfx##flush_prologue \
416 \
291 while (1) { \ 417 while (1) { \
292 prot##cache_op(hitop, addr); \ 418 prot##cache_op(hitop, addr); \
293 if (addr == aend) \ 419 if (addr == aend) \
294 break; \ 420 break; \
295 addr += lsize; \ 421 addr += lsize; \
296 } \ 422 } \
423 \
424 __##pfx##flush_epilogue \
297} 425}
298 426
299__BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, protected_) 427__BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, protected_)
diff --git a/include/asm-mips/smtc.h b/include/asm-mips/smtc.h
new file mode 100644
index 000000000000..e1941d1b8726
--- /dev/null
+++ b/include/asm-mips/smtc.h
@@ -0,0 +1,55 @@
1#ifndef _ASM_SMTC_MT_H
2#define _ASM_SMTC_MT_H
3
4/*
5 * Definitions for SMTC multitasking on MIPS MT cores
6 */
7
8#include <asm/mips_mt.h>
9
10/*
11 * System-wide SMTC status information
12 */
13
14extern unsigned int smtc_status;
15
16#define SMTC_TLB_SHARED 0x00000001
17#define SMTC_MTC_ACTIVE 0x00000002
18
19/*
20 * TLB/ASID Management information
21 */
22
23#define MAX_SMTC_TLBS 2
24#define MAX_SMTC_ASIDS 256
25#if NR_CPUS <= 8
26typedef char asiduse;
27#else
28#if NR_CPUS <= 16
29typedef short asiduse;
30#else
31typedef long asiduse;
32#endif
33#endif
34
35extern asiduse smtc_live_asid[MAX_SMTC_TLBS][MAX_SMTC_ASIDS];
36
37void smtc_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu);
38
39void smtc_flush_tlb_asid(unsigned long asid);
40extern int mipsmt_build_cpu_map(int startslot);
41extern void mipsmt_prepare_cpus(void);
42extern void smtc_smp_finish(void);
43extern void smtc_boot_secondary(int cpu, struct task_struct *t);
44
45/*
46 * Sharing the TLB between multiple VPEs means that the
47 * "random" index selection function is not allowed to
48 * select the current value of the Index register. To
49 * avoid additional TLB pressure, the Index registers
50 * are "parked" with an non-Valid value.
51 */
52
53#define PARKED_INDEX ((unsigned int)0x80000000)
54
55#endif /* _ASM_SMTC_MT_H */
diff --git a/include/asm-mips/smtc_ipi.h b/include/asm-mips/smtc_ipi.h
new file mode 100644
index 000000000000..f22c3e2f993a
--- /dev/null
+++ b/include/asm-mips/smtc_ipi.h
@@ -0,0 +1,118 @@
1/*
2 * Definitions used in MIPS MT SMTC "Interprocessor Interrupt" code.
3 */
4#ifndef __ASM_SMTC_IPI_H
5#define __ASM_SMTC_IPI_H
6
7//#define SMTC_IPI_DEBUG
8
9#ifdef SMTC_IPI_DEBUG
10#include <asm/mipsregs.h>
11#include <asm/mipsmtregs.h>
12#endif /* SMTC_IPI_DEBUG */
13
14/*
15 * An IPI "message"
16 */
17
18struct smtc_ipi {
19 struct smtc_ipi *flink;
20 int type;
21 void *arg;
22 int dest;
23#ifdef SMTC_IPI_DEBUG
24 int sender;
25 long stamp;
26#endif /* SMTC_IPI_DEBUG */
27};
28
29/*
30 * Defined IPI Types
31 */
32
33#define LINUX_SMP_IPI 1
34#define SMTC_CLOCK_TICK 2
35
36/*
37 * A queue of IPI messages
38 */
39
40struct smtc_ipi_q {
41 struct smtc_ipi *head;
42 spinlock_t lock;
43 struct smtc_ipi *tail;
44 int depth;
45};
46
47extern struct smtc_ipi_q IPIQ[NR_CPUS];
48extern struct smtc_ipi_q freeIPIq;
49
50static inline void smtc_ipi_nq(struct smtc_ipi_q *q, struct smtc_ipi *p)
51{
52 long flags;
53
54 spin_lock_irqsave(&q->lock, flags);
55 if (q->head == NULL)
56 q->head = q->tail = p;
57 else
58 q->tail->flink = p;
59 p->flink = NULL;
60 q->tail = p;
61 q->depth++;
62#ifdef SMTC_IPI_DEBUG
63 p->sender = read_c0_tcbind();
64 p->stamp = read_c0_count();
65#endif /* SMTC_IPI_DEBUG */
66 spin_unlock_irqrestore(&q->lock, flags);
67}
68
69static inline struct smtc_ipi *smtc_ipi_dq(struct smtc_ipi_q *q)
70{
71 struct smtc_ipi *p;
72 long flags;
73
74 spin_lock_irqsave(&q->lock, flags);
75 if (q->head == NULL)
76 p = NULL;
77 else {
78 p = q->head;
79 q->head = q->head->flink;
80 q->depth--;
81 /* Arguably unnecessary, but leaves queue cleaner */
82 if (q->head == NULL)
83 q->tail = NULL;
84 }
85 spin_unlock_irqrestore(&q->lock, flags);
86 return p;
87}
88
89static inline void smtc_ipi_req(struct smtc_ipi_q *q, struct smtc_ipi *p)
90{
91 long flags;
92
93 spin_lock_irqsave(&q->lock, flags);
94 if (q->head == NULL) {
95 q->head = q->tail = p;
96 p->flink = NULL;
97 } else {
98 p->flink = q->head;
99 q->head = p;
100 }
101 q->depth++;
102 spin_unlock_irqrestore(&q->lock, flags);
103}
104
105static inline int smtc_ipi_qdepth(struct smtc_ipi_q *q)
106{
107 long flags;
108 int retval;
109
110 spin_lock_irqsave(&q->lock, flags);
111 retval = q->depth;
112 spin_unlock_irqrestore(&q->lock, flags);
113 return retval;
114}
115
116extern void smtc_send_ipi(int cpu, int type, unsigned int action);
117
118#endif /* __ASM_SMTC_IPI_H */
diff --git a/include/asm-mips/smtc_proc.h b/include/asm-mips/smtc_proc.h
new file mode 100644
index 000000000000..25da651f1f5f
--- /dev/null
+++ b/include/asm-mips/smtc_proc.h
@@ -0,0 +1,23 @@
1/*
2 * Definitions for SMTC /proc entries
3 * Copyright(C) 2005 MIPS Technologies Inc.
4 */
5#ifndef __ASM_SMTC_PROC_H
6#define __ASM_SMTC_PROC_H
7
8/*
9 * per-"CPU" statistics
10 */
11
12struct smtc_cpu_proc {
13 unsigned long timerints;
14 unsigned long selfipis;
15};
16
17extern struct smtc_cpu_proc smtc_cpu_stats[NR_CPUS];
18
19/* Count of number of recoveries of "stolen" FPU access rights on 34K */
20
21extern atomic_t smtc_fpu_recoveries;
22
23#endif /* __ASM_SMTC_PROC_H */
diff --git a/include/asm-mips/stackframe.h b/include/asm-mips/stackframe.h
index 2acf3e844f00..c4856a874965 100644
--- a/include/asm-mips/stackframe.h
+++ b/include/asm-mips/stackframe.h
@@ -14,9 +14,14 @@
14#include <linux/threads.h> 14#include <linux/threads.h>
15 15
16#include <asm/asm.h> 16#include <asm/asm.h>
17#include <asm/asmmacro.h>
17#include <asm/mipsregs.h> 18#include <asm/mipsregs.h>
18#include <asm/asm-offsets.h> 19#include <asm/asm-offsets.h>
19 20
21#ifdef CONFIG_MIPS_MT_SMTC
22#include <asm/mipsmtregs.h>
23#endif /* CONFIG_MIPS_MT_SMTC */
24
20 .macro SAVE_AT 25 .macro SAVE_AT
21 .set push 26 .set push
22 .set noat 27 .set noat
@@ -57,13 +62,30 @@
57#ifdef CONFIG_SMP 62#ifdef CONFIG_SMP
58 .macro get_saved_sp /* SMP variation */ 63 .macro get_saved_sp /* SMP variation */
59#ifdef CONFIG_32BIT 64#ifdef CONFIG_32BIT
65#ifdef CONFIG_MIPS_MT_SMTC
66 .set mips32
67 mfc0 k0, CP0_TCBIND;
68 .set mips0
69 lui k1, %hi(kernelsp)
70 srl k0, k0, 19
71 /* No need to shift down and up to clear bits 0-1 */
72#else
60 mfc0 k0, CP0_CONTEXT 73 mfc0 k0, CP0_CONTEXT
61 lui k1, %hi(kernelsp) 74 lui k1, %hi(kernelsp)
62 srl k0, k0, 23 75 srl k0, k0, 23
76#endif
63 addu k1, k0 77 addu k1, k0
64 LONG_L k1, %lo(kernelsp)(k1) 78 LONG_L k1, %lo(kernelsp)(k1)
65#endif 79#endif
66#ifdef CONFIG_64BIT 80#ifdef CONFIG_64BIT
81#ifdef CONFIG_MIPS_MT_SMTC
82 .set mips64
83 mfc0 k0, CP0_TCBIND;
84 .set mips0
85 lui k0, %highest(kernelsp)
86 dsrl k1, 19
87 /* No need to shift down and up to clear bits 0-2 */
88#else
67 MFC0 k1, CP0_CONTEXT 89 MFC0 k1, CP0_CONTEXT
68 lui k0, %highest(kernelsp) 90 lui k0, %highest(kernelsp)
69 dsrl k1, 23 91 dsrl k1, 23
@@ -71,20 +93,31 @@
71 dsll k0, k0, 16 93 dsll k0, k0, 16
72 daddiu k0, %hi(kernelsp) 94 daddiu k0, %hi(kernelsp)
73 dsll k0, k0, 16 95 dsll k0, k0, 16
96#endif /* CONFIG_MIPS_MT_SMTC */
74 daddu k1, k1, k0 97 daddu k1, k1, k0
75 LONG_L k1, %lo(kernelsp)(k1) 98 LONG_L k1, %lo(kernelsp)(k1)
76#endif 99#endif /* CONFIG_64BIT */
77 .endm 100 .endm
78 101
79 .macro set_saved_sp stackp temp temp2 102 .macro set_saved_sp stackp temp temp2
80#ifdef CONFIG_32BIT 103#ifdef CONFIG_32BIT
104#ifdef CONFIG_MIPS_MT_SMTC
105 mfc0 \temp, CP0_TCBIND
106 srl \temp, 19
107#else
81 mfc0 \temp, CP0_CONTEXT 108 mfc0 \temp, CP0_CONTEXT
82 srl \temp, 23 109 srl \temp, 23
83#endif 110#endif
111#endif
84#ifdef CONFIG_64BIT 112#ifdef CONFIG_64BIT
113#ifdef CONFIG_MIPS_MT_SMTC
114 mfc0 \temp, CP0_TCBIND
115 dsrl \temp, 19
116#else
85 MFC0 \temp, CP0_CONTEXT 117 MFC0 \temp, CP0_CONTEXT
86 dsrl \temp, 23 118 dsrl \temp, 23
87#endif 119#endif
120#endif
88 LONG_S \stackp, kernelsp(\temp) 121 LONG_S \stackp, kernelsp(\temp)
89 .endm 122 .endm
90#else 123#else
@@ -122,10 +155,25 @@
122 PTR_SUBU sp, k1, PT_SIZE 155 PTR_SUBU sp, k1, PT_SIZE
123 LONG_S k0, PT_R29(sp) 156 LONG_S k0, PT_R29(sp)
124 LONG_S $3, PT_R3(sp) 157 LONG_S $3, PT_R3(sp)
158 /*
159 * You might think that you don't need to save $0,
160 * but the FPU emulator and gdb remote debug stub
161 * need it to operate correctly
162 */
125 LONG_S $0, PT_R0(sp) 163 LONG_S $0, PT_R0(sp)
126 mfc0 v1, CP0_STATUS 164 mfc0 v1, CP0_STATUS
127 LONG_S $2, PT_R2(sp) 165 LONG_S $2, PT_R2(sp)
128 LONG_S v1, PT_STATUS(sp) 166 LONG_S v1, PT_STATUS(sp)
167#ifdef CONFIG_MIPS_MT_SMTC
168 /*
169 * Ideally, these instructions would be shuffled in
170 * to cover the pipeline delay.
171 */
172 .set mips32
173 mfc0 v1, CP0_TCSTATUS
174 .set mips0
175 LONG_S v1, PT_TCSTATUS(sp)
176#endif /* CONFIG_MIPS_MT_SMTC */
129 LONG_S $4, PT_R4(sp) 177 LONG_S $4, PT_R4(sp)
130 mfc0 v1, CP0_CAUSE 178 mfc0 v1, CP0_CAUSE
131 LONG_S $5, PT_R5(sp) 179 LONG_S $5, PT_R5(sp)
@@ -234,14 +282,36 @@
234 .endm 282 .endm
235 283
236#else 284#else
285/*
286 * For SMTC kernel, global IE should be left set, and interrupts
287 * controlled exclusively via IXMT.
288 */
237 289
290#ifdef CONFIG_MIPS_MT_SMTC
291#define STATMASK 0x1e
292#else
293#define STATMASK 0x1f
294#endif
238 .macro RESTORE_SOME 295 .macro RESTORE_SOME
239 .set push 296 .set push
240 .set reorder 297 .set reorder
241 .set noat 298 .set noat
299#ifdef CONFIG_MIPS_MT_SMTC
300 .set mips32r2
301 /*
302 * This may not really be necessary if ints are already
303 * inhibited here.
304 */
305 mfc0 v0, CP0_TCSTATUS
306 ori v0, TCSTATUS_IXMT
307 mtc0 v0, CP0_TCSTATUS
308 ehb
309 DMT 5 # dmt a1
310 jal mips_ihb
311#endif /* CONFIG_MIPS_MT_SMTC */
242 mfc0 a0, CP0_STATUS 312 mfc0 a0, CP0_STATUS
243 ori a0, 0x1f 313 ori a0, STATMASK
244 xori a0, 0x1f 314 xori a0, STATMASK
245 mtc0 a0, CP0_STATUS 315 mtc0 a0, CP0_STATUS
246 li v1, 0xff00 316 li v1, 0xff00
247 and a0, v1 317 and a0, v1
@@ -250,6 +320,26 @@
250 and v0, v1 320 and v0, v1
251 or v0, a0 321 or v0, a0
252 mtc0 v0, CP0_STATUS 322 mtc0 v0, CP0_STATUS
323#ifdef CONFIG_MIPS_MT_SMTC
324/*
325 * Only after EXL/ERL have been restored to status can we
326 * restore TCStatus.IXMT.
327 */
328 LONG_L v1, PT_TCSTATUS(sp)
329 ehb
330 mfc0 v0, CP0_TCSTATUS
331 andi v1, TCSTATUS_IXMT
332 /* We know that TCStatua.IXMT should be set from above */
333 xori v0, v0, TCSTATUS_IXMT
334 or v0, v0, v1
335 mtc0 v0, CP0_TCSTATUS
336 ehb
337 andi a1, a1, VPECONTROL_TE
338 beqz a1, 1f
339 emt
3401:
341 .set mips0
342#endif /* CONFIG_MIPS_MT_SMTC */
253 LONG_L v1, PT_EPC(sp) 343 LONG_L v1, PT_EPC(sp)
254 MTC0 v1, CP0_EPC 344 MTC0 v1, CP0_EPC
255 LONG_L $31, PT_R31(sp) 345 LONG_L $31, PT_R31(sp)
@@ -302,11 +392,33 @@
302 * Set cp0 enable bit as sign that we're running on the kernel stack 392 * Set cp0 enable bit as sign that we're running on the kernel stack
303 */ 393 */
304 .macro CLI 394 .macro CLI
395#if !defined(CONFIG_MIPS_MT_SMTC)
305 mfc0 t0, CP0_STATUS 396 mfc0 t0, CP0_STATUS
306 li t1, ST0_CU0 | 0x1f 397 li t1, ST0_CU0 | 0x1f
307 or t0, t1 398 or t0, t1
308 xori t0, 0x1f 399 xori t0, 0x1f
309 mtc0 t0, CP0_STATUS 400 mtc0 t0, CP0_STATUS
401#else /* CONFIG_MIPS_MT_SMTC */
402 /*
403 * For SMTC, we need to set privilege
404 * and disable interrupts only for the
405 * current TC, using the TCStatus register.
406 */
407 mfc0 t0,CP0_TCSTATUS
408 /* Fortunately CU 0 is in the same place in both registers */
409 /* Set TCU0, TMX, TKSU (for later inversion) and IXMT */
410 li t1, ST0_CU0 | 0x08001c00
411 or t0,t1
412 /* Clear TKSU, leave IXMT */
413 xori t0, 0x00001800
414 mtc0 t0, CP0_TCSTATUS
415 ehb
416 /* We need to leave the global IE bit set, but clear EXL...*/
417 mfc0 t0, CP0_STATUS
418 ori t0, ST0_EXL | ST0_ERL
419 xori t0, ST0_EXL | ST0_ERL
420 mtc0 t0, CP0_STATUS
421#endif /* CONFIG_MIPS_MT_SMTC */
310 irq_disable_hazard 422 irq_disable_hazard
311 .endm 423 .endm
312 424
@@ -315,11 +427,35 @@
315 * Set cp0 enable bit as sign that we're running on the kernel stack 427 * Set cp0 enable bit as sign that we're running on the kernel stack
316 */ 428 */
317 .macro STI 429 .macro STI
430#if !defined(CONFIG_MIPS_MT_SMTC)
318 mfc0 t0, CP0_STATUS 431 mfc0 t0, CP0_STATUS
319 li t1, ST0_CU0 | 0x1f 432 li t1, ST0_CU0 | 0x1f
320 or t0, t1 433 or t0, t1
321 xori t0, 0x1e 434 xori t0, 0x1e
322 mtc0 t0, CP0_STATUS 435 mtc0 t0, CP0_STATUS
436#else /* CONFIG_MIPS_MT_SMTC */
437 /*
438 * For SMTC, we need to set privilege
439 * and enable interrupts only for the
440 * current TC, using the TCStatus register.
441 */
442 ehb
443 mfc0 t0,CP0_TCSTATUS
444 /* Fortunately CU 0 is in the same place in both registers */
445 /* Set TCU0, TKSU (for later inversion) and IXMT */
446 li t1, ST0_CU0 | 0x08001c00
447 or t0,t1
448 /* Clear TKSU *and* IXMT */
449 xori t0, 0x00001c00
450 mtc0 t0, CP0_TCSTATUS
451 ehb
452 /* We need to leave the global IE bit set, but clear EXL...*/
453 mfc0 t0, CP0_STATUS
454 ori t0, ST0_EXL
455 xori t0, ST0_EXL
456 mtc0 t0, CP0_STATUS
457 /* irq_enable_hazard below should expand to EHB for 24K/34K cpus */
458#endif /* CONFIG_MIPS_MT_SMTC */
323 irq_enable_hazard 459 irq_enable_hazard
324 .endm 460 .endm
325 461
@@ -328,11 +464,56 @@
328 * Set cp0 enable bit as sign that we're running on the kernel stack 464 * Set cp0 enable bit as sign that we're running on the kernel stack
329 */ 465 */
330 .macro KMODE 466 .macro KMODE
467#ifdef CONFIG_MIPS_MT_SMTC
468 /*
469 * This gets baroque in SMTC. We want to
470 * protect the non-atomic clearing of EXL
471 * with DMT/EMT, but we don't want to take
472 * an interrupt while DMT is still in effect.
473 */
474
475 /* KMODE gets invoked from both reorder and noreorder code */
476 .set push
477 .set mips32r2
478 .set noreorder
479 mfc0 v0, CP0_TCSTATUS
480 andi v1, v0, TCSTATUS_IXMT
481 ori v0, TCSTATUS_IXMT
482 mtc0 v0, CP0_TCSTATUS
483 ehb
484 DMT 2 # dmt v0
485 /*
486 * We don't know a priori if ra is "live"
487 */
488 move t0, ra
489 jal mips_ihb
490 nop /* delay slot */
491 move ra, t0
492#endif /* CONFIG_MIPS_MT_SMTC */
331 mfc0 t0, CP0_STATUS 493 mfc0 t0, CP0_STATUS
332 li t1, ST0_CU0 | 0x1e 494 li t1, ST0_CU0 | 0x1e
333 or t0, t1 495 or t0, t1
334 xori t0, 0x1e 496 xori t0, 0x1e
335 mtc0 t0, CP0_STATUS 497 mtc0 t0, CP0_STATUS
498#ifdef CONFIG_MIPS_MT_SMTC
499 ehb
500 andi v0, v0, VPECONTROL_TE
501 beqz v0, 2f
502 nop /* delay slot */
503 emt
5042:
505 mfc0 v0, CP0_TCSTATUS
506 /* Clear IXMT, then OR in previous value */
507 ori v0, TCSTATUS_IXMT
508 xori v0, TCSTATUS_IXMT
509 or v0, v1, v0
510 mtc0 v0, CP0_TCSTATUS
511 /*
512 * irq_disable_hazard below should expand to EHB
513 * on 24K/34K CPUS
514 */
515 .set pop
516#endif /* CONFIG_MIPS_MT_SMTC */
336 irq_disable_hazard 517 irq_disable_hazard
337 .endm 518 .endm
338 519
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 13:05:26 -0500