drivers/perf: hisi: Add support for HiSilicon UC PMU driver

On HiSilicon Hip09 platform, there are 4 UC (unified cache) modules
on each chip CCL (CPU Cluster). UC is a cache that provides
coherence between NUMA and UMA domains. It is located between L2
and Memory System. Many PMU events are supported. Let's support
the UC PMU driver using the HiSilicon uncore PMU framework.

* rd_req_en : rd_req_en is the abbreviation of read request tracetag
enable and allows user to count only read operations. Details are listed
in the hisi-pmu document at Documentation/admin-guide/perf/hisi-pmu.rst

* srcid_en & srcid: Allows users to filter statistical information based
on specific CPU/ICL by srcid.
srcid_en depends on rd_req_en being enabled.

* uring_channel: Allows users to filter statistical information based on
the specified tx request uring channel.
uring_channel only supported events: [0x47 ~ 0x59].

Signed-off-by: Junhao He <[email protected]>
Reviewed-by: Yicong Yang <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Junhao He

drivers/perf/hisilicon/Makefile

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_HISI_PMU) += hisi_uncore_pmu.o hisi_uncore_l3c_pmu.o \
 			  hisi_uncore_hha_pmu.o hisi_uncore_ddrc_pmu.o hisi_uncore_sllc_pmu.o \
-			  hisi_uncore_pa_pmu.o hisi_uncore_cpa_pmu.o
+			  hisi_uncore_pa_pmu.o hisi_uncore_cpa_pmu.o hisi_uncore_uc_pmu.o
 
 obj-$(CONFIG_HISI_PCIE_PMU) += hisi_pcie_pmu.o
 obj-$(CONFIG_HNS3_PMU) += hns3_pmu.o

drivers/perf/hisilicon/hisi_uncore_pmu.c

@@ -20,7 +20,6 @@
 
 #include "hisi_uncore_pmu.h"
 
-#define HISI_GET_EVENTID(ev) (ev->hw.config_base & 0xff)
 #define HISI_MAX_PERIOD(nr) (GENMASK_ULL((nr) - 1, 0))
 
 /*
@@ -226,6 +225,9 @@ int hisi_uncore_pmu_event_init(struct perf_event *event)
 	hwc->idx		= -1;
 	hwc->config_base	= event->attr.config;
 
+	if (hisi_pmu->ops->check_filter && hisi_pmu->ops->check_filter(event))
+		return -EINVAL;
+
 	/* Enforce to use the same CPU for all events in this PMU */
 	event->cpu = hisi_pmu->on_cpu;
 

drivers/perf/hisilicon/hisi_uncore_pmu.h

@@ -43,9 +43,15 @@
 		return FIELD_GET(GENMASK_ULL(hi, lo), event->attr.config);  \
 	}
 
+#define HISI_GET_EVENTID(ev) (ev->hw.config_base & 0xff)
+
+#define HISI_PMU_EVTYPE_BITS		8
+#define HISI_PMU_EVTYPE_SHIFT(idx)	((idx) % 4 * HISI_PMU_EVTYPE_BITS)
+
 struct hisi_pmu;
 
 struct hisi_uncore_ops {
+	int (*check_filter)(struct perf_event *event);
 	void (*write_evtype)(struct hisi_pmu *, int, u32);
 	int (*get_event_idx)(struct perf_event *);
 	u64 (*read_counter)(struct hisi_pmu *, struct hw_perf_event *);