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    SubjectRe: [PATCH V3 4/5] perf/amd/iommu: Introduce get_iommu_bnk_cnt_evt_idx
    On Tue, Feb 09, 2016 at 04:53:54PM -0600, Suravee Suthikulpanit wrote:
    > 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);

    You don't need to break this line - let it stick out.


    --
    Regards/Gruss,
    Boris.

    ECO tip #101: Trim your mails when you reply.

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