Messages in this thread Patch in this message | | | From | Suravee Suthikulpanit <> | Subject | [PATCH V3 4/5] perf/amd/iommu: Introduce get_iommu_bnk_cnt_evt_idx | Date | Tue, 9 Feb 2016 16:53:54 -0600 |
| |
Introduce a helper function to calculate bit-index for assigning performance counter assignment.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> --- arch/x86/kernel/cpu/perf_event_amd_iommu.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_amd_iommu.c b/arch/x86/kernel/cpu/perf_event_amd_iommu.c index 2d59e20..791bbcf 100644 --- a/arch/x86/kernel/cpu/perf_event_amd_iommu.c +++ b/arch/x86/kernel/cpu/perf_event_amd_iommu.c @@ -145,18 +145,28 @@ static struct attribute_group amd_iommu_cpumask_group = { /*---------------------------------------------*/ +static inline +int get_iommu_bnk_cnt_evt_idx(struct perf_amd_iommu *perf_iommu, + int iommu_index, int bank_index, + int cntr_index) +{ + int cntrs_per_iommu = perf_iommu->max_banks * perf_iommu->max_counters; + int index = (perf_iommu->max_counters * bank_index) + cntr_index; + + return (cntrs_per_iommu * iommu_index) + index; +} + static int get_next_avail_iommu_bnk_cntr(struct perf_amd_iommu *perf_iommu) { unsigned long flags; int shift, bank, cntr, retval; - int max_banks = perf_iommu->max_banks; - int max_cntrs = perf_iommu->max_counters; raw_spin_lock_irqsave(&perf_iommu->lock, flags); - for (bank = 0, shift = 0; bank < max_banks; bank++) { - for (cntr = 0; cntr < max_cntrs; cntr++) { - shift = bank + (bank*3) + cntr; + for (bank = 0, shift = 0; bank < perf_iommu->max_banks; bank++) { + for (cntr = 0; cntr < perf_iommu->max_counters; cntr++) { + shift = get_iommu_bnk_cnt_evt_idx(perf_iommu, + 0, bank, cntr); if (perf_iommu->cntr_assign_mask & (1ULL<<shift)) { continue; } else { -- 2.5.0
| |