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perf/arm-ni: Support sharing IRQs within an NI instance

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NI-700 has a distinct PMU interrupt output for each Clock Domain,
however some integrations may still combine these together externally.
The initial driver didn't attempt to support this, in anticipation of a
more general solution for IRQ sharing between system PMU instances, but
that's still a way off, so let's make this intermediate step for now to
at least allow sharing IRQs within an individual NI instance.

Now that CPU affinity and migration are cleaned up, it's fairly
straightforward to adopt similar logic to arm-cmn, to identify CDs with
a common interrupt and loop over them directly in the handler.

Signed-off-by: Shouping Wang <allen.wang@hj-micro.com>
[ rm: Rework for affinity handling, cosmetics, new commit message ]
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/f62db639d3b54c959ec477db7b8ccecbef1ca310.1752256072.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Shouping Wang 2025-07-11 19:15:17 +01:00 committed by Will Deacon
parent 6a5dc6c753
commit 89f0b9ccd3
1 changed files with 55 additions and 27 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

50
drivers/perf/arm-ni.c
View file

@ -102,6 +102,7 @@ struct arm_ni_unit {
struct arm_ni_cd {
void __iomem *pmu_base;
u16 id;
s8 irq_friend;
int num_units;
int irq;
struct pmu pmu;
@ -448,6 +449,8 @@ static irqreturn_t arm_ni_handle_irq(int irq, void *dev_id)
{
struct arm_ni_cd *cd = dev_id;
irqreturn_t ret = IRQ_NONE;
for (;;) {
u32 reg = readl_relaxed(cd->pmu_base + NI_PMOVSCLR);
if (reg & (1U << NI_CCNT_IDX)) {
@ -467,14 +470,16 @@ static irqreturn_t arm_ni_handle_irq(int irq, void *dev_id)
}
}
writel_relaxed(reg, cd->pmu_base + NI_PMOVSCLR);
if (!cd->irq_friend)
return ret;
cd += cd->irq_friend;
}
}
static int arm_ni_init_cd(struct arm_ni *ni, struct arm_ni_node *node, u64 res_start)
{
struct arm_ni_cd *cd = ni->cds + node->id;
const char *name;
int err;
cd->id = node->id;
cd->num_units = node->num_components;
@ -534,20 +539,11 @@ static int arm_ni_init_cd(struct arm_ni *ni, struct arm_ni_node *node, u64 res_s
cd->pmu_base + NI_PMCR);
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMCNTENCLR);
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMOVSCLR);
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMINTENSET);
cd->irq = platform_get_irq(to_platform_device(ni->dev), cd->id);
if (cd->irq < 0)
return cd->irq;
err = devm_request_irq(ni->dev, cd->irq, arm_ni_handle_irq,
IRQF_NOBALANCING | IRQF_NO_THREAD,
dev_name(ni->dev), cd);
if (err)
return err;
irq_set_affinity(cd->irq, cpumask_of(ni->cpu));
cd->pmu = (struct pmu) {
.module = THIS_MODULE,
.parent = ni->dev,
@ -593,6 +589,34 @@ static void arm_ni_probe_domain(void __iomem *base, struct arm_ni_node *node)
node->num_components = readl_relaxed(base + NI_CHILD_NODE_INFO);
}
static int arm_ni_init_irqs(struct arm_ni *ni)
{
int err;
ni_for_each_cd(ni, cd) {
for (struct arm_ni_cd *prev = cd; prev-- > ni->cds; ) {
if (prev->irq == cd->irq) {
prev->irq_friend = cd - prev;
goto set_inten;
}
}
err = devm_request_irq(ni->dev, cd->irq, arm_ni_handle_irq,
IRQF_NOBALANCING | IRQF_NO_THREAD | IRQF_NO_AUTOEN,
dev_name(ni->dev), cd);
if (err)
return err;
irq_set_affinity(cd->irq, cpumask_of(ni->cpu));
set_inten:
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMINTENSET);
}
ni_for_each_cd(ni, cd)
if (!cd->irq_friend)
enable_irq(cd->irq);
return 0;
}
static int arm_ni_probe(struct platform_device *pdev)
{
struct arm_ni_node cfg, vd, pd, cd;
@ -677,7 +701,11 @@ static int arm_ni_probe(struct platform_device *pdev)
}
}
return 0;
ret = arm_ni_init_irqs(ni);
if (ret)
arm_ni_remove(pdev);
return ret;
}
#ifdef CONFIG_OF