Messages in this thread Patch in this message | | | From | Suravee Suthikulpanit <> | Subject | [PATCH v2 4/6] perf/amd/iommu: Introduce data structure for tracking prev count. | Date | Fri, 1 Jan 2016 12:13:38 -0600 |
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To enable AMD IOMMU PMU to support multiple IOMMUs, this patch introduces a new data structure, perf_amd_iommu.prev_cnts, to track previous counts of IOMMU performance counters in multi-IOMMU environment.
Also, this patch allocates perf_iommu_cnts for internal use when manages counters.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> --- arch/x86/kernel/cpu/perf_event_amd_iommu.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_amd_iommu.c b/arch/x86/kernel/cpu/perf_event_amd_iommu.c index e6d2485..99fcd10 100644 --- a/arch/x86/kernel/cpu/perf_event_amd_iommu.c +++ b/arch/x86/kernel/cpu/perf_event_amd_iommu.c @@ -42,6 +42,7 @@ struct perf_amd_iommu { u64 cntr_assign_mask; raw_spinlock_t lock; const struct attribute_group *attr_groups[4]; + local64_t *prev_cnts; }; #define format_group attr_groups[0] @@ -126,6 +127,8 @@ static struct amd_iommu_event_desc amd_iommu_v2_event_descs[] = { { /* end: all zeroes */ }, }; +static u64 *perf_iommu_cnts; + /*--------------------------------------------- * sysfs cpumask attributes *---------------------------------------------*/ @@ -423,10 +426,14 @@ static __init int _init_events_attrs(struct perf_amd_iommu *perf_iommu) static __init void amd_iommu_pc_exit(void) { - if (__perf_iommu.events_group != NULL) { - kfree(__perf_iommu.events_group); - __perf_iommu.events_group = NULL; - } + kfree(__perf_iommu.events_group); + __perf_iommu.events_group = NULL; + + kfree(__perf_iommu.prev_cnts); + __perf_iommu.prev_cnts = NULL; + + kfree(perf_iommu_cnts); + perf_iommu_cnts = NULL; } static __init int _init_perf_amd_iommu( @@ -456,6 +463,17 @@ static __init int _init_perf_amd_iommu( perf_iommu->null_group = NULL; perf_iommu->pmu.attr_groups = perf_iommu->attr_groups; + perf_iommu->prev_cnts = kzalloc(sizeof(*perf_iommu->prev_cnts) * + (amd_iommu_get_num_iommus() * perf_iommu->max_banks * + perf_iommu->max_counters), GFP_KERNEL); + if (!perf_iommu->prev_cnts) + return -ENOMEM; + + perf_iommu_cnts = kzalloc(sizeof(*perf_iommu_cnts) * + amd_iommu_get_num_iommus(), GFP_KERNEL); + if (!perf_iommu_cnts) + return -ENOMEM; + ret = perf_pmu_register(&perf_iommu->pmu, name, -1); if (ret) { pr_err("perf: amd_iommu: Failed to initialized.\n"); -- 1.9.1
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