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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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