57852a853b
Add instrumentation for hypervisor calls on pseries. Call statistics include number of calls, wall time and cpu cycles (if available) and are made available via debugfs. Instrumentation code is behind the HCALL_STATS config option and has no impact if not enabled. Signed-off-by: Mike Kravetz <kravetz@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
165 lines
3.5 KiB
ArmAsm
165 lines
3.5 KiB
ArmAsm
/*
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* This file contains the generic code to perform a call to the
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* pSeries LPAR hypervisor.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/hvcall.h>
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#define STK_PARM(i) (48 + ((i)-3)*8)
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#ifdef CONFIG_HCALL_STATS
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/*
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* precall must preserve all registers. use unused STK_PARM()
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* areas to save snapshots and opcode.
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*/
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#define HCALL_INST_PRECALL \
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std r3,STK_PARM(r3)(r1); /* save opcode */ \
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mftb r0; /* get timebase and */ \
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std r0,STK_PARM(r5)(r1); /* save for later */ \
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BEGIN_FTR_SECTION; \
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mfspr r0,SPRN_PURR; /* get PURR and */ \
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std r0,STK_PARM(r6)(r1); /* save for later */ \
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END_FTR_SECTION_IFCLR(CPU_FTR_PURR);
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/*
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* postcall is performed immediately before function return which
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* allows liberal use of volatile registers.
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*/
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#define HCALL_INST_POSTCALL \
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ld r4,STK_PARM(r3)(r1); /* validate opcode */ \
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cmpldi cr7,r4,MAX_HCALL_OPCODE; \
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bgt- cr7,1f; \
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\
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/* get time and PURR snapshots after hcall */ \
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mftb r7; /* timebase after */ \
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BEGIN_FTR_SECTION; \
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mfspr r8,SPRN_PURR; /* PURR after */ \
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ld r6,STK_PARM(r6)(r1); /* PURR before */ \
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subf r6,r6,r8; /* delta */ \
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END_FTR_SECTION_IFCLR(CPU_FTR_PURR); \
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ld r5,STK_PARM(r5)(r1); /* timebase before */ \
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subf r5,r5,r7; /* time delta */ \
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\
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/* calculate address of stat structure r4 = opcode */ \
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srdi r4,r4,2; /* index into array */ \
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mulli r4,r4,HCALL_STAT_SIZE; \
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LOAD_REG_ADDR(r7, per_cpu__hcall_stats); \
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add r4,r4,r7; \
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ld r7,PACA_DATA_OFFSET(r13); /* per cpu offset */ \
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add r4,r4,r7; \
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\
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/* update stats */ \
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ld r7,HCALL_STAT_CALLS(r4); /* count */ \
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addi r7,r7,1; \
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std r7,HCALL_STAT_CALLS(r4); \
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ld r7,HCALL_STAT_TB(r4); /* timebase */ \
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add r7,r7,r5; \
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std r7,HCALL_STAT_TB(r4); \
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BEGIN_FTR_SECTION; \
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ld r7,HCALL_STAT_PURR(r4); /* PURR */ \
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add r7,r7,r6; \
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std r7,HCALL_STAT_PURR(r4); \
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END_FTR_SECTION_IFCLR(CPU_FTR_PURR); \
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1:
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#else
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#define HCALL_INST_PRECALL
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#define HCALL_INST_POSTCALL
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#endif
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.text
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_GLOBAL(plpar_hcall_norets)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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HCALL_INST_PRECALL
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HVSC /* invoke the hypervisor */
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HCALL_INST_POSTCALL
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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_GLOBAL(plpar_hcall)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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HCALL_INST_PRECALL
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std r4,STK_PARM(r4)(r1) /* Save ret buffer */
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mr r4,r5
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mr r5,r6
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mr r6,r7
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mr r7,r8
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mr r8,r9
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mr r9,r10
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HVSC /* invoke the hypervisor */
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ld r12,STK_PARM(r4)(r1)
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std r4, 0(r12)
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std r5, 8(r12)
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std r6, 16(r12)
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std r7, 24(r12)
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HCALL_INST_POSTCALL
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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_GLOBAL(plpar_hcall9)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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HCALL_INST_PRECALL
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std r4,STK_PARM(r4)(r1) /* Save ret buffer */
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mr r4,r5
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mr r5,r6
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mr r6,r7
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mr r7,r8
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mr r8,r9
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mr r9,r10
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ld r10,STK_PARM(r11)(r1) /* put arg7 in R10 */
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ld r11,STK_PARM(r12)(r1) /* put arg8 in R11 */
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ld r12,STK_PARM(r13)(r1) /* put arg9 in R12 */
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HVSC /* invoke the hypervisor */
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ld r12,STK_PARM(r4)(r1)
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std r4, 0(r12)
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std r5, 8(r12)
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std r6, 16(r12)
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std r7, 24(r12)
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std r8, 32(r12)
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std r9, 40(r12)
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std r10,48(r12)
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std r11,56(r12)
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std r12,64(r12)
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HCALL_INST_POSTCALL
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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