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powerpc: Initialise PMU related regs on Power8
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For both HV and guest kernels, intialise PMU regs to something sane.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Michael Ellerman authored and Benjamin Herrenschmidt committed Apr 26, 2013
1 parent 959c9bd commit 240686c
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Showing 2 changed files with 26 additions and 1 deletion.
6 changes: 6 additions & 0 deletions arch/powerpc/include/asm/reg.h
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Original file line number Diff line number Diff line change
Expand Up @@ -271,6 +271,7 @@
#define SPRN_HFSCR 0xbe /* HV=1 Facility Status & Control Register */
#define HFSCR_TAR (1 << (63-55)) /* Enable Target Address Register */
#define HFSCR_TM (1 << (63-58)) /* Enable Transactional Memory */
#define HFSCR_PM (1 << (63-60)) /* Enable prob/priv access to PMU SPRs */
#define HFSCR_DSCR (1 << (63-61)) /* Enable Data Stream Control Register */
#define HFSCR_VECVSX (1 << (63-62)) /* Enable VMX/VSX */
#define HFSCR_FP (1 << (63-63)) /* Enable Floating Point */
Expand Down Expand Up @@ -637,6 +638,7 @@
#define MMCR0_FCWAIT 0x00000002UL /* freeze counter in WAIT state */
#define MMCR0_FCHV 0x00000001UL /* freeze conditions in hypervisor mode */
#define SPRN_MMCR1 798
#define SPRN_MMCR2 769
#define SPRN_MMCRA 0x312
#define MMCRA_SDSYNC 0x80000000UL /* SDAR synced with SIAR */
#define MMCRA_SDAR_DCACHE_MISS 0x40000000UL
Expand All @@ -655,6 +657,10 @@
#define POWER7P_MMCRA_SIAR_VALID 0x10000000 /* P7+ SIAR contents valid */
#define POWER7P_MMCRA_SDAR_VALID 0x08000000 /* P7+ SDAR contents valid */

#define SPRN_MMCRH 316 /* Hypervisor monitor mode control register */
#define SPRN_MMCRS 894 /* Supervisor monitor mode control register */
#define SPRN_MMCRC 851 /* Core monitor mode control register */

#define SPRN_PMC1 787
#define SPRN_PMC2 788
#define SPRN_PMC3 789
Expand Down
21 changes: 20 additions & 1 deletion arch/powerpc/kernel/cpu_setup_power.S
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ _GLOBAL(__restore_cpu_power7)
_GLOBAL(__setup_cpu_power8)
mflr r11
bl __init_FSCR
bl __init_PMU
bl __init_hvmode_206
mtlr r11
beqlr
Expand All @@ -59,12 +60,14 @@ _GLOBAL(__setup_cpu_power8)
bl __init_LPCR
bl __init_HFSCR
bl __init_TLB
bl __init_PMU_HV
mtlr r11
blr

_GLOBAL(__restore_cpu_power8)
mflr r11
bl __init_FSCR
bl __init_PMU
mfmsr r3
rldicl. r0,r3,4,63
mtlr r11
Expand All @@ -76,6 +79,7 @@ _GLOBAL(__restore_cpu_power8)
bl __init_LPCR
bl __init_HFSCR
bl __init_TLB
bl __init_PMU_HV
mtlr r11
blr

Expand Down Expand Up @@ -125,7 +129,7 @@ __init_FSCR:

__init_HFSCR:
mfspr r3,SPRN_HFSCR
ori r3,r3,HFSCR_TAR|HFSCR_TM|HFSCR_DSCR|HFSCR_VECVSX|HFSCR_FP
ori r3,r3,HFSCR_TAR|HFSCR_TM|HFSCR_DSCR|HFSCR_VECVSX|HFSCR_FP|HFSCR_PM
mtspr SPRN_HFSCR,r3
blr

Expand All @@ -140,3 +144,18 @@ __init_TLB:
bdnz 2b
ptesync
1: blr

__init_PMU_HV:
li r5,0
mtspr SPRN_MMCRC,r5
mtspr SPRN_MMCRH,r5
blr

__init_PMU:
li r5,0
mtspr SPRN_MMCRS,r5
mtspr SPRN_MMCRA,r5
mtspr SPRN_MMCR0,r5
mtspr SPRN_MMCR1,r5
mtspr SPRN_MMCR2,r5
blr

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