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powerpc/perf: Enable BHRB access for EBB events

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The previous commit added constraint and register handling to allow
processes using EBB (Event Based Branches) to request access to the BHRB
(Branch History Rolling Buffer).

With that in place we can allow processes using EBB to access the BHRB.
This is achieved by setting BHRBA in MMCR0 when we enable EBB access. We
must also clear BHRBA when we are disabling.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2014-03-14 16:00:34 +11:00 committed by Benjamin Herrenschmidt
parent ba969237cf
commit 76cb8a783a
2 changed files with 7 additions and 4 deletions
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1
arch/powerpc/include/asm/reg.h
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@ -664,6 +664,7 @@
#define MMCR0_PMXE 0x04000000UL /* performance monitor exception enable */
#define MMCR0_FCECE 0x02000000UL /* freeze ctrs on enabled cond or event */
#define MMCR0_TBEE 0x00400000UL /* time base exception enable */
#define MMCR0_BHRBA 0x00200000UL /* BHRB Access allowed in userspace */
#define MMCR0_EBE 0x00100000UL /* Event based branch enable */
#define MMCR0_PMCC 0x000c0000UL /* PMC control */
#define MMCR0_PMCC_U6 0x00080000UL /* PMC1-6 are R/W by user (PR) */

10
arch/powerpc/perf/core-book3s.c
View file

@ -78,6 +78,7 @@ static unsigned int freeze_events_kernel = MMCR0_FCS;
#define MMCR0_FC56 0
#define MMCR0_PMAO 0
#define MMCR0_EBE 0
#define MMCR0_BHRBA 0
#define MMCR0_PMCC 0
#define MMCR0_PMCC_U6 0
@ -546,8 +547,8 @@ static unsigned long ebb_switch_in(bool ebb, unsigned long mmcr0)
if (!ebb)
goto out;
/* Enable EBB and read/write to all 6 PMCs for userspace */
mmcr0 |= MMCR0_EBE | MMCR0_PMCC_U6;
/* Enable EBB and read/write to all 6 PMCs and BHRB for userspace */
mmcr0 |= MMCR0_EBE | MMCR0_BHRBA | MMCR0_PMCC_U6;
/*
* Add any bits from the user MMCR0, FC or PMAO. This is compatible
@ -1117,11 +1118,12 @@ static void power_pmu_disable(struct pmu *pmu)
}
/*
* Set the 'freeze counters' bit, clear EBE/PMCC/PMAO/FC56.
* Set the 'freeze counters' bit, clear EBE/BHRBA/PMCC/PMAO/FC56
*/
val = mmcr0 = mfspr(SPRN_MMCR0);
val |= MMCR0_FC;
val &= ~(MMCR0_EBE | MMCR0_PMCC | MMCR0_PMAO | MMCR0_FC56);
val &= ~(MMCR0_EBE | MMCR0_BHRBA | MMCR0_PMCC | MMCR0_PMAO |
MMCR0_FC56);
/*
* The barrier is to make sure the mtspr has been