Merge tag 'tenstorrent-dt-for-v7.2' of https://git.kernel.org/pub/scm/linux/kernel/git/tenstorrent/linux into soc/dt

Tenstorrent device tree for v7.2

Add a riscv,pmu node to the Tenstorrent Blackhole SoC device tree. This
enables OpenSBI to expose the SBI PMU extension, allowing Linux perf to
use the 4 programmable counters (mhpmcounter3-6) across 3 event classes:
instruction commit, microarchitectural, and memory system events.

Extend the RISC-V IOMMU device tree bindings to document the Tenstorrent
IOMMU used in the Tenstorrent Atlantis SoC. A second register range is
added which contains M-mode only registers like PMAs and PMPs. The
binding will be used by OpenSBI and potentially other M-mode software.

* tag 'tenstorrent-dt-for-v7.2' of https://git.kernel.org/pub/scm/linux/kernel/git/tenstorrent/linux:
  dt-bindings: iommu: riscv: Add bindings for Tenstorrent RISC-V IOMMU
  riscv: dts: tenstorrent: Add PMU node to blackhole for Linux perf support

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

2 files changed, 99 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/iommu/riscv,iommu.yaml b/Documentation/devicetree/bindings/iommu/riscv,iommu.yaml
index d4838c3b3741..f83efb3ee000 100644
--- a/Documentation/devicetree/bindings/iommu/riscv,iommu.yaml
+++ b/Documentation/devicetree/bindings/iommu/riscv,iommu.yaml
@@ -32,22 +32,35 @@ properties:
   # should be specified along with 'reg' property providing MMIO location.
   compatible:
     oneOf:
-      - items:
+      - description: Platform (non-PCIe) IOMMU implementations
+        items:
           - enum:
               - qemu,riscv-iommu
+              - tenstorrent,riscv-iommu
           - const: riscv,iommu
-      - items:
+      - description: PCIe IOMMU implementations
+        items:
           - enum:
               - pci1efd,edf1
           - const: riscv,pci-iommu
 
   reg:
-    maxItems: 1
-    description:
-      For non-PCI devices this represents base address and size of for the
-      IOMMU memory mapped registers interface.
-      For PCI IOMMU hardware implementation this should represent an address
-      of the IOMMU, as defined in the PCI Bus Binding reference.
+    minItems: 1
+    items:
+      - description:
+          For non-PCI devices, base address and size of the IOMMU memory
+          mapped registers interface. For PCI IOMMU hardware
+          implementation, an address of the IOMMU, as defined in the PCI
+          Bus Binding reference.
+      - description:
+          Region containing platform specific MMRs for machine-mode
+          configuration, such as PMA and PMP registers.
+
+  reg-names:
+    minItems: 1
+    items:
+      - const: base
+      - const: machine
 
   '#iommu-cells':
     const: 1
@@ -75,6 +88,26 @@ required:
 
 additionalProperties: false
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - tenstorrent,riscv-iommu
+    then:
+      properties:
+        reg:
+          minItems: 2
+        reg-names:
+          minItems: 2
+    else:
+      properties:
+        reg:
+          maxItems: 1
+        reg-names:
+          maxItems: 1
+
 examples:
   - |+
     /* Example 1 (IOMMU device with wired interrupts) */
@@ -145,3 +178,13 @@ examples:
             };
         };
     };
+
+  - |+
+    /* Example 5 (Tenstorrent IOMMU device with MSIs) */
+    iommu5: iommu@d2020000 {
+        compatible = "tenstorrent,riscv-iommu", "riscv,iommu";
+        reg = <0xd2020000 0x10000>, <0xaa000000 0x10000>;
+        reg-names = "base", "machine";
+        msi-parent = <&imsics_smode>;
+        #iommu-cells = <1>;
+    };
diff --git a/arch/riscv/boot/dts/tenstorrent/blackhole.dtsi b/arch/riscv/boot/dts/tenstorrent/blackhole.dtsi
index 6408810d8d80..5f709e45d9b2 100644
--- a/arch/riscv/boot/dts/tenstorrent/blackhole.dtsi
+++ b/arch/riscv/boot/dts/tenstorrent/blackhole.dtsi
@@ -77,6 +77,54 @@
 		};
 	};
 
+	pmu {
+		compatible = "riscv,pmu";
+		riscv,event-to-mhpmevent =
+			/* SBI_PMU_HW_CPU_CYCLES -> CPU cycles */
+			<0x00001 0x00000000 0x0001>,
+			/* SBI_PMU_HW_INSTRUCTIONS -> Instructions executed */
+			<0x00002 0x00000000 0x0004>,
+			/* SBI_PMU_HW_CACHE_REFERENCES -> I-cache/ITIM busy | D-cache/DTIM busy */
+			<0x00003 0x00000000 0x1801>,
+			/* SBI_PMU_HW_CACHE_MISSES -> I-cache miss | D-cache miss */
+			<0x00004 0x00000000 0x0302>,
+			/* SBI_PMU_HW_BRANCH_INSTRUCTIONS -> Conditional branch retired */
+			<0x00005 0x00000000 0x4000>,
+			/*
+			 * SBI_PMU_HW_BRANCH_MISSES ->
+			 * Branch direction misprediction | Branch/jump target misprediction
+			 */
+			<0x00006 0x00000000 0x6001>,
+			/* L1D_READ_MISS -> Data cache miss or MMIO access */
+			<0x10001 0x00000000 0x0202>,
+			/* L1D_WRITE_ACCESS -> Data cache write-back */
+			<0x10002 0x00000000 0x0402>,
+			/* L1I_READ_MISS -> Instruction cache miss */
+			<0x10009 0x00000000 0x0102>,
+			/* LL_READ_MISS -> UTLB miss */
+			<0x10011 0x00000000 0x2002>,
+			/* DTLB_READ_MISS -> Data TLB miss */
+			<0x10019 0x00000000 0x1002>,
+			/* ITLB_READ_MISS -> Instruction TLB miss */
+			<0x10021 0x00000000 0x0802>;
+		riscv,event-to-mhpmcounters =
+			<0x00001 0x00001 0x01>,
+			<0x00002 0x00002 0x04>,
+			<0x00003 0x00006 0x78>,
+			<0x10001 0x10002 0x78>,
+			<0x10009 0x10009 0x78>,
+			<0x10011 0x10011 0x78>,
+			<0x10019 0x10019 0x78>,
+			<0x10021 0x10021 0x78>;
+		riscv,raw-event-to-mhpmcounters =
+			/* Class 0: Instruction Commit Events, bits 8-25 variant */
+			<0x0 0x0 0xffffffff 0xfc0000ff 0x78>,
+			/* Class 1: Microarchitectural Events, bits 8-18 variant */
+			<0x0 0x1 0xffffffff 0xfff800ff 0x78>,
+			/* Class 2: Memory System Events, bits 8-13 variant */
+			<0x0 0x2 0xffffffff 0xffffc0ff 0x78>;
+	};
+
 	soc {
 		#address-cells = <2>;
 		#size-cells = <2>;