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| author | Michael Ellerman <mpe@ellerman.id.au> | 2014-03-14 06:00:34 +0100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-03-23 23:48:27 +0100 |
| commit | 76cb8a783a4b7403a6731ffdeec0831cd4b19936 (patch) | |
| tree | 03418d8204460f19b74ed88b453c3c5827dc32fa /arch/powerpc/include | |
| parent | powerpc/perf: Add BHRB constraint and IFM MMCRA handling for EBB (diff) | |
| download | linux-76cb8a783a4b7403a6731ffdeec0831cd4b19936.tar.xz linux-76cb8a783a4b7403a6731ffdeec0831cd4b19936.zip | |
powerpc/perf: Enable BHRB access for EBB events
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>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 30034720589a..980e8db2f261 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -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) */ |