xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/perf: Add support for SIER

Browse Source 
On power8 we have a new SIER (Sampled Instruction Event Register), which
captures information about instructions when we have random sampling
enabled.

Add support for loading the SIER into pt_regs, overloading regs->dar.
Also set the new NO_SIPR flag in regs->result if we don't have SIPR.

Update regs_sihv/sipr() to look for SIPR/SIHV in SIER.

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>
This commit is contained in:
Michael Ellerman
2013-04-25 19:28:27 +00:00
committed by Benjamin Herrenschmidt
parent 860aad71fc
commit 8f61aa325f
3 changed files with 25 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
arch/powerpc/perf/core-book3s.c
View File

@@ -140,6 +140,9 @@ static bool regs_sihv(struct pt_regs *regs)
{
unsigned long sihv = MMCRA_SIHV;
if (ppmu->flags & PPMU_HAS_SIER)
return !!(regs->dar & SIER_SIHV);
if (ppmu->flags & PPMU_ALT_SIPR)
sihv = POWER6_MMCRA_SIHV;
@@ -150,6 +153,9 @@ static bool regs_sipr(struct pt_regs *regs)
{
unsigned long sipr = MMCRA_SIPR;
if (ppmu->flags & PPMU_HAS_SIER)
return !!(regs->dar & SIER_SIPR);
if (ppmu->flags & PPMU_ALT_SIPR)
sipr = POWER6_MMCRA_SIPR;
@@ -203,6 +209,7 @@ static inline u32 perf_get_misc_flags(struct pt_regs *regs)
/*
* Overload regs->dsisr to store MMCRA so we only need to read it once
* on each interrupt.
* Overload regs->dar to store SIER if we have it.
* Overload regs->result to specify whether we should use the MSR (result
* is zero) or the SIAR (result is non zero).
*/
@@ -218,6 +225,18 @@ static inline void perf_read_regs(struct pt_regs *regs)
if (ppmu->flags & PPMU_NO_SIPR)
regs->result |= 2;
/*
* On power8 if we're in random sampling mode, the SIER is updated.
* If we're in continuous sampling mode, we don't have SIPR.
*/
if (ppmu->flags & PPMU_HAS_SIER) {
if (marked)
regs->dar = mfspr(SPRN_SIER);
else
regs->result |= 2;
}
/*
* If this isn't a PMU exception (eg a software event) the SIAR is
* not valid. Use pt_regs.