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Date: Tue, 22 Dec 2015 13:19:16 -0600 From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com> To: <joro@...tes.org>, <bp@...en8.de>, <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org> CC: <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>, Suravee Suthikulpanit <Suravee.Suthikulpanit@....com> Subject: [PATCH 5/6] perf/amd/iommu: Introduce get_iommu_bnk_cnt_evt_idx Introduce a helper function to calculate bit-index for assigning performance counter assignment. Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....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 99fcd10..8af7149 100644 --- a/arch/x86/kernel/cpu/perf_event_amd_iommu.c +++ b/arch/x86/kernel/cpu/perf_event_amd_iommu.c @@ -153,18 +153,28 @@ 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 { -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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