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Subject[PATCH 3/3] perf/arm-cci: Allow building as a module
Date
Fill in the few extra bits and annotations needed to make the driver
work properly as a module, and jiggle the Kconfig to expose the
driver-level ARM_CCI_PMU option.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---

Preserving the current level of configurability does end up allowing a
rather pointless module configuration which supports no hardware variants,
but I couldn't find a way to enforce "at least one sub-option selected"
logic without Kbuild claiming a recursive dependency.

drivers/perf/Kconfig | 31 +++++++++++++++++--------------
drivers/perf/arm-cci.c | 17 ++++++++++++++++-
2 files changed, 33 insertions(+), 15 deletions(-)

diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
index 28bb5a029558..269331bfb746 100644
--- a/drivers/perf/Kconfig
+++ b/drivers/perf/Kconfig
@@ -6,30 +6,33 @@ menu "Performance monitor support"
depends on PERF_EVENTS

config ARM_CCI_PMU
- bool
+ tristate "ARM CCI PMU driver"
select ARM_CCI
+ help
+ Support for PMU events monitoring on the ARM CCI (Cache Coherent
+ Interconnect) family of products.
+
+ If compiled as a module, it will be called arm-cci.

config ARM_CCI400_PMU
- bool "ARM CCI400 PMU support"
+ bool "support CCI-400"
+ default y
depends on (ARM && CPU_V7) || ARM64
+ depends on ARM_CCI_PMU
select ARM_CCI400_COMMON
- select ARM_CCI_PMU
help
- Support for PMU events monitoring on the ARM CCI-400 (cache coherent
- interconnect). CCI-400 supports counting events related to the
- connected slave/master interfaces.
+ CCI-400 provides 4 independent event counters counting events related
+ to the connected slave/master interfaces, plus a cycle counter.

config ARM_CCI5xx_PMU
- bool "ARM CCI-500/CCI-550 PMU support"
+ bool "support CCI-500/CCI-550"
+ default y
depends on (ARM && CPU_V7) || ARM64
- select ARM_CCI_PMU
+ depends on ARM_CCI_PMU
help
- Support for PMU events monitoring on the ARM CCI-500/CCI-550 cache
- coherent interconnects. Both of them provide 8 independent event counters,
- which can count events pertaining to the slave/master interfaces as well
- as the internal events to the CCI.
-
- If unsure, say Y
+ CCI-500/CCI-550 both provide 8 independent event counters, which can
+ count events pertaining to the slave/master interfaces as well as the
+ internal events to the CCI.

config ARM_CCN
tristate "ARM CCN driver support"
diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 7029d8fe8f44..09938dd8eb6f 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -1416,6 +1416,7 @@ static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev)
pmu_format_attr_group.attrs = model->format_attrs;

cci_pmu->pmu = (struct pmu) {
+ .module = THIS_MODULE,
.name = cci_pmu->model->name,
.task_ctx_nr = perf_invalid_context,
.pmu_enable = cci_pmu_enable,
@@ -1581,6 +1582,7 @@ static const struct of_device_id arm_cci_pmu_matches[] = {
#endif
{},
};
+MODULE_DEVICE_TABLE(of, arm_cci_pmu_matches);

static bool is_duplicate_irq(int irq, int *irqs, int nr_irqs)
{
@@ -1702,14 +1704,27 @@ static int cci_pmu_probe(struct platform_device *pdev)
return 0;
}

+static int cci_pmu_remove(struct platform_device *pdev)
+{
+ if (!g_cci_pmu)
+ return 0;
+
+ cpuhp_remove_state(CPUHP_AP_PERF_ARM_CCI_ONLINE);
+ perf_pmu_unregister(&g_cci_pmu->pmu);
+ g_cci_pmu = NULL;
+
+ return 0;
+}
+
static struct platform_driver cci_pmu_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = arm_cci_pmu_matches,
},
.probe = cci_pmu_probe,
+ .remove = cci_pmu_remove,
};

-builtin_platform_driver(cci_pmu_driver);
+module_platform_driver(cci_pmu_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ARM CCI PMU support");
--
2.17.0.dirty
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