Merge branch 'for-next/perf-smmu' into for-next/perf

* for-next/perf-smmu:
  perf/smmuv3: Synthesize IIDR from CoreSight ID registers
  perf/smmuv3: Add devicetree support
  dt-bindings: Add Arm SMMUv3 PMCG binding

Author: willdeacon

Documentation/devicetree/bindings/perf/arm,smmu-v3-pmcg.yaml

@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/perf/arm,smmu-v3-pmcg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm SMMUv3 Performance Monitor Counter Group
+
+maintainers:
+  - Will Deacon <will@kernel.org>
+  - Robin Murphy <robin.murphy@arm.com>
+
+description: |
+  An SMMUv3 may have several Performance Monitor Counter Group (PMCG).
+  They are standalone performance monitoring units that support both
+  architected and IMPLEMENTATION DEFINED event counters.
+
+properties:
+  $nodename:
+    pattern: "^pmu@[0-9a-f]*"
+  compatible:
+    oneOf:
+      - items:
+          - const: arm,mmu-600-pmcg
+          - const: arm,smmu-v3-pmcg
+      - const: arm,smmu-v3-pmcg
+
+  reg:
+    items:
+      - description: Register page 0
+      - description: Register page 1, if SMMU_PMCG_CFGR.RELOC_CTRS = 1
+    minItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  msi-parent: true
+
+required:
+  - compatible
+  - reg
+
+anyOf:
+  - required:
+      - interrupts
+  - required:
+      - msi-parent
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    pmu@2b420000 {
+            compatible = "arm,smmu-v3-pmcg";
+            reg = <0x2b420000 0x1000>,
+                  <0x2b430000 0x1000>;
+            interrupts = <GIC_SPI 80 IRQ_TYPE_EDGE_RISING>;
+            msi-parent = <&its 0xff0000>;
+    };
+
+    pmu@2b440000 {
+            compatible = "arm,smmu-v3-pmcg";
+            reg = <0x2b440000 0x1000>,
+                  <0x2b450000 0x1000>;
+            interrupts = <GIC_SPI 81 IRQ_TYPE_EDGE_RISING>;
+            msi-parent = <&its 0xff0000>;
+    };

drivers/perf/arm_smmuv3_pmu.c

@@ -47,6 +47,7 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/msi.h>
+#include <linux/of.h>
 #include <linux/perf_event.h>
 #include <linux/platform_device.h>
 #include <linux/smp.h>
@@ -75,6 +76,10 @@
 #define SMMU_PMCG_CR                    0xE04
 #define SMMU_PMCG_CR_ENABLE             BIT(0)
 #define SMMU_PMCG_IIDR                  0xE08
+#define SMMU_PMCG_IIDR_PRODUCTID        GENMASK(31, 20)
+#define SMMU_PMCG_IIDR_VARIANT          GENMASK(19, 16)
+#define SMMU_PMCG_IIDR_REVISION         GENMASK(15, 12)
+#define SMMU_PMCG_IIDR_IMPLEMENTER      GENMASK(11, 0)
 #define SMMU_PMCG_CEID0                 0xE20
 #define SMMU_PMCG_CEID1                 0xE28
 #define SMMU_PMCG_IRQ_CTRL              0xE50
@@ -83,6 +88,20 @@
 #define SMMU_PMCG_IRQ_CFG1              0xE60
 #define SMMU_PMCG_IRQ_CFG2              0xE64
 
+/* IMP-DEF ID registers */
+#define SMMU_PMCG_PIDR0                 0xFE0
+#define SMMU_PMCG_PIDR0_PART_0          GENMASK(7, 0)
+#define SMMU_PMCG_PIDR1                 0xFE4
+#define SMMU_PMCG_PIDR1_DES_0           GENMASK(7, 4)
+#define SMMU_PMCG_PIDR1_PART_1          GENMASK(3, 0)
+#define SMMU_PMCG_PIDR2                 0xFE8
+#define SMMU_PMCG_PIDR2_REVISION        GENMASK(7, 4)
+#define SMMU_PMCG_PIDR2_DES_1           GENMASK(2, 0)
+#define SMMU_PMCG_PIDR3                 0xFEC
+#define SMMU_PMCG_PIDR3_REVAND          GENMASK(7, 4)
+#define SMMU_PMCG_PIDR4                 0xFD0
+#define SMMU_PMCG_PIDR4_DES_2           GENMASK(3, 0)
+
 /* MSI config fields */
 #define MSI_CFG0_ADDR_MASK              GENMASK_ULL(51, 2)
 #define MSI_CFG2_MEMATTR_DEVICE_nGnRE   0x1
@@ -754,6 +773,41 @@ static void smmu_pmu_get_acpi_options(struct smmu_pmu *smmu_pmu)
 	dev_notice(smmu_pmu->dev, "option mask 0x%x\n", smmu_pmu->options);
 }
 
+static bool smmu_pmu_coresight_id_regs(struct smmu_pmu *smmu_pmu)
+{
+	return of_device_is_compatible(smmu_pmu->dev->of_node,
+				       "arm,mmu-600-pmcg");
+}
+
+static void smmu_pmu_get_iidr(struct smmu_pmu *smmu_pmu)
+{
+	u32 iidr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_IIDR);
+
+	if (!iidr && smmu_pmu_coresight_id_regs(smmu_pmu)) {
+		u32 pidr0 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR0);
+		u32 pidr1 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR1);
+		u32 pidr2 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR2);
+		u32 pidr3 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR3);
+		u32 pidr4 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR4);
+
+		u32 productid = FIELD_GET(SMMU_PMCG_PIDR0_PART_0, pidr0) |
+				(FIELD_GET(SMMU_PMCG_PIDR1_PART_1, pidr1) << 8);
+		u32 variant = FIELD_GET(SMMU_PMCG_PIDR2_REVISION, pidr2);
+		u32 revision = FIELD_GET(SMMU_PMCG_PIDR3_REVAND, pidr3);
+		u32 implementer =
+			FIELD_GET(SMMU_PMCG_PIDR1_DES_0, pidr1) |
+			(FIELD_GET(SMMU_PMCG_PIDR2_DES_1, pidr2) << 4) |
+			(FIELD_GET(SMMU_PMCG_PIDR4_DES_2, pidr4) << 8);
+
+		iidr = FIELD_PREP(SMMU_PMCG_IIDR_PRODUCTID, productid) |
+		       FIELD_PREP(SMMU_PMCG_IIDR_VARIANT, variant) |
+		       FIELD_PREP(SMMU_PMCG_IIDR_REVISION, revision) |
+		       FIELD_PREP(SMMU_PMCG_IIDR_IMPLEMENTER, implementer);
+	}
+
+	smmu_pmu->iidr = iidr;
+}
+
 static int smmu_pmu_probe(struct platform_device *pdev)
 {
 	struct smmu_pmu *smmu_pmu;
@@ -825,7 +879,7 @@ static int smmu_pmu_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	smmu_pmu->iidr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_IIDR);
+	smmu_pmu_get_iidr(smmu_pmu);
 
 	name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "smmuv3_pmcg_%llx",
 			      (res_0->start) >> SMMU_PMCG_PA_SHIFT);
@@ -834,7 +888,8 @@ static int smmu_pmu_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	smmu_pmu_get_acpi_options(smmu_pmu);
+	if (!dev->of_node)
+		smmu_pmu_get_acpi_options(smmu_pmu);
 
 	/* Pick one CPU to be the preferred one to use */
 	smmu_pmu->on_cpu = raw_smp_processor_id();
@@ -884,9 +939,16 @@ static void smmu_pmu_shutdown(struct platform_device *pdev)
 	smmu_pmu_disable(&smmu_pmu->pmu);
 }
 
+static const struct of_device_id smmu_pmu_of_match[] = {
+	{ .compatible = "arm,smmu-v3-pmcg" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, smmu_pmu_of_match);
+
 static struct platform_driver smmu_pmu_driver = {
 	.driver = {
 		.name = "arm-smmu-v3-pmcg",
+		.of_match_table = of_match_ptr(smmu_pmu_of_match),
 		.suppress_bind_attrs = true,
 	},
 	.probe = smmu_pmu_probe,