#define DMAR_PERFCFGOFF_REG 0x310
#define DMAR_PERFOVFOFF_REG 0x318
#define DMAR_PERFCNTROFF_REG 0x31c
+#define DMAR_PERFINTRSTS_REG 0x324
+#define DMAR_PERFINTRCTL_REG 0x328
#define DMAR_PERFEVNTCAP_REG 0x380
#define DMAR_ECMD_REG 0x400
#define DMAR_ECEO_REG 0x408
#define DMA_VCS_PAS ((u64)1)
+/* PERFINTRSTS_REG */
+#define DMA_PERFINTRSTS_PIS ((u32)1)
+
#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
do { \
cycles_t start_time = get_cycles(); \
struct pmu pmu;
DECLARE_BITMAP(used_mask, IOMMU_PMU_IDX_MAX);
struct perf_event *event_list[IOMMU_PMU_IDX_MAX];
+ unsigned char irq_name[16];
};
+#define IOMMU_IRQ_ID_OFFSET_PRQ (DMAR_UNITS_SUPPORTED)
+#define IOMMU_IRQ_ID_OFFSET_PERF (2 * DMAR_UNITS_SUPPORTED)
+
struct intel_iommu {
void __iomem *reg; /* Pointer to hardware regs, virtual addr */
u64 reg_phys; /* physical address of hw register set */
int seq_id; /* sequence id of the iommu */
int agaw; /* agaw of this iommu */
int msagaw; /* max sagaw of this iommu */
- unsigned int irq, pr_irq;
+ unsigned int irq, pr_irq, perf_irq;
u16 segment; /* PCI segment# */
unsigned char name[13]; /* Device Name */
ecmd_submit_sync(iommu, DMA_ECMD_FREEZE, 0, 0);
}
+static void iommu_pmu_counter_overflow(struct iommu_pmu *iommu_pmu)
+{
+ struct perf_event *event;
+ u64 status;
+ int i;
+
+ /*
+ * Two counters may be overflowed very close. Always check
+ * whether there are more to handle.
+ */
+ while ((status = dmar_readq(iommu_pmu->overflow))) {
+ for_each_set_bit(i, (unsigned long *)&status, iommu_pmu->num_cntr) {
+ /*
+ * Find the assigned event of the counter.
+ * Accumulate the value into the event->count.
+ */
+ event = iommu_pmu->event_list[i];
+ if (!event) {
+ pr_warn_once("Cannot find the assigned event for counter %d\n", i);
+ continue;
+ }
+ iommu_pmu_event_update(event);
+ }
+
+ dmar_writeq(iommu_pmu->overflow, status);
+ }
+}
+
+static irqreturn_t iommu_pmu_irq_handler(int irq, void *dev_id)
+{
+ struct intel_iommu *iommu = dev_id;
+
+ if (!dmar_readl(iommu->reg + DMAR_PERFINTRSTS_REG))
+ return IRQ_NONE;
+
+ iommu_pmu_counter_overflow(iommu->pmu);
+
+ /* Clear the status bit */
+ dmar_writel(iommu->reg + DMAR_PERFINTRSTS_REG, DMA_PERFINTRSTS_PIS);
+
+ return IRQ_HANDLED;
+}
+
static int __iommu_pmu_register(struct intel_iommu *iommu)
{
struct iommu_pmu *iommu_pmu = iommu->pmu;
iommu->pmu = NULL;
}
+static int iommu_pmu_set_interrupt(struct intel_iommu *iommu)
+{
+ struct iommu_pmu *iommu_pmu = iommu->pmu;
+ int irq, ret;
+
+ irq = dmar_alloc_hwirq(IOMMU_IRQ_ID_OFFSET_PERF + iommu->seq_id, iommu->node, iommu);
+ if (irq <= 0)
+ return -EINVAL;
+
+ snprintf(iommu_pmu->irq_name, sizeof(iommu_pmu->irq_name), "dmar%d-perf", iommu->seq_id);
+
+ iommu->perf_irq = irq;
+ ret = request_threaded_irq(irq, NULL, iommu_pmu_irq_handler,
+ IRQF_ONESHOT, iommu_pmu->irq_name, iommu);
+ if (ret) {
+ dmar_free_hwirq(irq);
+ iommu->perf_irq = 0;
+ return ret;
+ }
+ return 0;
+}
+
+static void iommu_pmu_unset_interrupt(struct intel_iommu *iommu)
+{
+ if (!iommu->perf_irq)
+ return;
+
+ free_irq(iommu->perf_irq, iommu);
+ dmar_free_hwirq(iommu->perf_irq);
+ iommu->perf_irq = 0;
+}
+
static int iommu_pmu_cpu_online(unsigned int cpu)
{
if (cpumask_empty(&iommu_pmu_cpu_mask))
if (iommu_pmu_cpuhp_setup(iommu_pmu))
goto unregister;
+ /* Set interrupt for overflow */
+ if (iommu_pmu_set_interrupt(iommu))
+ goto cpuhp_free;
+
return;
+cpuhp_free:
+ iommu_pmu_cpuhp_free(iommu_pmu);
unregister:
perf_pmu_unregister(&iommu_pmu->pmu);
err:
if (!iommu_pmu)
return;
+ iommu_pmu_unset_interrupt(iommu);
iommu_pmu_cpuhp_free(iommu_pmu);
perf_pmu_unregister(&iommu_pmu->pmu);
}