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Message-Id: <20250403-msipic-yaml-v1-1-f4248475714f@posteo.net>
Date: Thu, 03 Apr 2025 19:38:00 +0200
From: J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Crystal Wood <oss@...error.net>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Naveen N Rao <naveen@...nel.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
J. Neuschäfer <j.ne@...teo.net>
Subject: [PATCH] dt-bindings: interrupt-controller: Convert fsl,mpic-msi to
YAML
From: "J. Neuschäfer" <j.ne@...teo.net>
As part of a larger effort to bring various PowerPC-related bindings
into the YAML world, this patch converts msi-pic.txt to YAML and moves
it into the bindings/interrupt-controller/ directory. The conversion may
necessarily be a bit hard to read because the binding is quite verbose.
Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
---
.../interrupt-controller/fsl,mpic-msi.yaml | 141 +++++++++++++++++++++
.../devicetree/bindings/powerpc/fsl/msi-pic.txt | 111 ----------------
2 files changed, 141 insertions(+), 111 deletions(-)
diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,mpic-msi.yaml b/Documentation/devicetree/bindings/interrupt-controller/fsl,mpic-msi.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..99a98864bd10c5e5b67112c0149fe123b51ca26f
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,mpic-msi.yaml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/fsl,mpic-msi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale MSI interrupt controller
+
+description:
+ The Freescale hypervisor and msi-address-64
+ -------------------------------------------
+
+ Normally, PCI devices have access to all of CCSR via an ATMU mapping. The
+ Freescale MSI driver calculates the address of MSIIR (in the MSI register
+ block) and sets that address as the MSI message address.
+
+ In a virtualized environment, the hypervisor may need to create an IOMMU
+ mapping for MSIIR. The Freescale ePAPR hypervisor has this requirement
+ because of hardware limitations of the Peripheral Access Management Unit
+ (PAMU), which is currently the only IOMMU that the hypervisor supports.
+ The ATMU is programmed with the guest physical address, and the PAMU
+ intercepts transactions and reroutes them to the true physical address.
+
+ In the PAMU, each PCI controller is given only one primary window. The
+ PAMU restricts DMA operations so that they can only occur within a window.
+ Because PCI devices must be able to DMA to memory, the primary window must
+ be used to cover all of the guest's memory space.
+
+ PAMU primary windows can be divided into 256 subwindows, and each
+ subwindow can have its own address mapping ("guest physical" to "true
+ physical"). However, each subwindow has to have the same alignment, which
+ means they cannot be located at just any address. Because of these
+ restrictions, it is usually impossible to create a 4KB subwindow that
+ covers MSIIR where it's normally located.
+
+ Therefore, the hypervisor has to create a subwindow inside the same
+ primary window used for memory, but mapped to the MSIR block (where MSIIR
+ lives). The first subwindow after the end of guest memory is used for
+ this. The address specified in the msi-address-64 property is the PCI
+ address of MSIIR. The hypervisor configures the PAMU to map that address to
+ the true physical address of MSIIR.
+
+maintainers:
+ - J. Neuschäfer <j.ne@...teo.net>
+
+properties:
+ compatible:
+ oneOf:
+ - enum:
+ - fsl,mpic-msi
+ - fsl,mpic-msi-v4.3
+ - fsl,ipic-msi
+ - fsl,vmpic-msi
+ - fsl,vmpic-msi-v4.3
+ - items:
+ - enum:
+ - fsl,mpc8572-msi
+ - fsl,mpc8610-msi
+ - fsl,mpc8641-msi
+ - const: fsl,mpic-msi
+ description:
+ compatible list, may contain one or two entries The first is
+ "fsl,CHIP-msi", where CHIP is the processor(mpc8610, mpc8572, etc.) and
+ the second is "fsl,mpic-msi" or "fsl,ipic-msi" or "fsl,mpic-msi-v4.3"
+ depending on the parent type and version. If mpic version is 4.3, the
+ number of MSI registers is increased to 16, MSIIR1 is provided to access
+ these 16 registers, and compatible "fsl,mpic-msi-v4.3" should be used.
+ The first entry is optional; the second entry is required.
+
+ reg:
+ minItems: 1
+ items:
+ - description: Address and length of the shared message interrupt
+ register set
+ - description: Address of aliased MSIIR or MSIIR1 register for platforms
+ that have such an alias. If using MSIIR1, the second region must be
+ added because different MSI group has different MSIIR1 offset.
+
+ interrupts:
+ minItems: 1
+ maxItems: 16
+ description:
+ Each one of the interrupts here is one entry per 32 MSIs, and routed to
+ the host interrupt controller. The interrupts should be set as edge
+ sensitive. If msi-available-ranges is present, only the interrupts that
+ correspond to available ranges shall be present.
+
+ msi-available-ranges:
+ $ref: /schemas/types.yaml#/definitions/uint32-matrix
+ items:
+ items:
+ - description: First MSI interrupt in this range
+ - description: Number of MSI interrupts in this range
+ description:
+ Use <start count> style section to define which MSI interrupt can be used
+ in the 256 msi interrupts. This property is optional, without this, all
+ the MSI interrupts can be used. Each available range must begin and end
+ on a multiple of 32 (i.e. no splitting an individual MSI register or the
+ associated PIC interrupt). MPIC v4.3 does not support this property
+ because the 32 interrupts of an individual register are not continuous
+ when using MSIIR1.
+
+ msi-address-64:
+ $ref: /schemas/types.yaml#/definitions/uint64
+ description:
+ 64-bit PCI address of the MSIIR register. The MSIIR register is used for
+ MSI messaging. The address of MSIIR in PCI address space is the MSI
+ message address.
+
+ This property may be used in virtualized environments where the hypervisor
+ has created an alternate mapping for the MSIR block. See the top-level
+ description for an explanation.
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ msi@...00 {
+ compatible = "fsl,mpc8610-msi", "fsl,mpic-msi";
+ reg = <0x41600 0x80>;
+ msi-available-ranges = <0 0x100>;
+ interrupts = <0xe0 0>, <0xe1 0>, <0xe2 0>, <0xe3 0>,
+ <0xe4 0>, <0xe5 0>, <0xe6 0>, <0xe7 0>;
+ };
+
+ - |
+ msi@...00 {
+ compatible = "fsl,mpic-msi-v4.3";
+ reg = <0x41600 0x200 0x44148 4>;
+ interrupts = <0xe0 0 0 0>, <0xe1 0 0 0>, <0xe2 0 0 0>, <0xe3 0 0 0>,
+ <0xe4 0 0 0>, <0xe5 0 0 0>, <0xe6 0 0 0>, <0xe7 0 0 0>,
+ <0x100 0 0 0>, <0x101 0 0 0>, <0x102 0 0 0>, <0x103 0 0 0>,
+ <0x104 0 0 0>, <0x105 0 0 0>, <0x106 0 0 0>, <0x107 0 0 0>;
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/msi-pic.txt b/Documentation/devicetree/bindings/powerpc/fsl/msi-pic.txt
deleted file mode 100644
index f8d2b7fe06d695971d48ba21ab67e5b72a212fe9..0000000000000000000000000000000000000000
--- a/Documentation/devicetree/bindings/powerpc/fsl/msi-pic.txt
+++ /dev/null
@@ -1,111 +0,0 @@
-* Freescale MSI interrupt controller
-
-Required properties:
-- compatible : compatible list, may contain one or two entries
- The first is "fsl,CHIP-msi", where CHIP is the processor(mpc8610, mpc8572,
- etc.) and the second is "fsl,mpic-msi" or "fsl,ipic-msi" or
- "fsl,mpic-msi-v4.3" depending on the parent type and version. If mpic
- version is 4.3, the number of MSI registers is increased to 16, MSIIR1 is
- provided to access these 16 registers, and compatible "fsl,mpic-msi-v4.3"
- should be used. The first entry is optional; the second entry is
- required.
-
-- reg : It may contain one or two regions. The first region should contain
- the address and the length of the shared message interrupt register set.
- The second region should contain the address of aliased MSIIR or MSIIR1
- register for platforms that have such an alias, if using MSIIR1, the second
- region must be added because different MSI group has different MSIIR1 offset.
-
-- interrupts : each one of the interrupts here is one entry per 32 MSIs,
- and routed to the host interrupt controller. the interrupts should
- be set as edge sensitive. If msi-available-ranges is present, only
- the interrupts that correspond to available ranges shall be present.
-
-Optional properties:
-- msi-available-ranges: use <start count> style section to define which
- msi interrupt can be used in the 256 msi interrupts. This property is
- optional, without this, all the MSI interrupts can be used.
- Each available range must begin and end on a multiple of 32 (i.e.
- no splitting an individual MSI register or the associated PIC interrupt).
- MPIC v4.3 does not support this property because the 32 interrupts of an
- individual register are not continuous when using MSIIR1.
-
-- msi-address-64: 64-bit PCI address of the MSIIR register. The MSIIR register
- is used for MSI messaging. The address of MSIIR in PCI address space is
- the MSI message address.
-
- This property may be used in virtualized environments where the hypervisor
- has created an alternate mapping for the MSIR block. See below for an
- explanation.
-
-
-Example:
- msi@...00 {
- compatible = "fsl,mpc8610-msi", "fsl,mpic-msi";
- reg = <0x41600 0x80>;
- msi-available-ranges = <0 0x100>;
- interrupts = <
- 0xe0 0
- 0xe1 0
- 0xe2 0
- 0xe3 0
- 0xe4 0
- 0xe5 0
- 0xe6 0
- 0xe7 0>;
- interrupt-parent = <&mpic>;
- };
-
- msi@...00 {
- compatible = "fsl,mpic-msi-v4.3";
- reg = <0x41600 0x200 0x44148 4>;
- interrupts = <
- 0xe0 0 0 0
- 0xe1 0 0 0
- 0xe2 0 0 0
- 0xe3 0 0 0
- 0xe4 0 0 0
- 0xe5 0 0 0
- 0xe6 0 0 0
- 0xe7 0 0 0
- 0x100 0 0 0
- 0x101 0 0 0
- 0x102 0 0 0
- 0x103 0 0 0
- 0x104 0 0 0
- 0x105 0 0 0
- 0x106 0 0 0
- 0x107 0 0 0>;
- };
-
-The Freescale hypervisor and msi-address-64
--------------------------------------------
-Normally, PCI devices have access to all of CCSR via an ATMU mapping. The
-Freescale MSI driver calculates the address of MSIIR (in the MSI register
-block) and sets that address as the MSI message address.
-
-In a virtualized environment, the hypervisor may need to create an IOMMU
-mapping for MSIIR. The Freescale ePAPR hypervisor has this requirement
-because of hardware limitations of the Peripheral Access Management Unit
-(PAMU), which is currently the only IOMMU that the hypervisor supports.
-The ATMU is programmed with the guest physical address, and the PAMU
-intercepts transactions and reroutes them to the true physical address.
-
-In the PAMU, each PCI controller is given only one primary window. The
-PAMU restricts DMA operations so that they can only occur within a window.
-Because PCI devices must be able to DMA to memory, the primary window must
-be used to cover all of the guest's memory space.
-
-PAMU primary windows can be divided into 256 subwindows, and each
-subwindow can have its own address mapping ("guest physical" to "true
-physical"). However, each subwindow has to have the same alignment, which
-means they cannot be located at just any address. Because of these
-restrictions, it is usually impossible to create a 4KB subwindow that
-covers MSIIR where it's normally located.
-
-Therefore, the hypervisor has to create a subwindow inside the same
-primary window used for memory, but mapped to the MSIR block (where MSIIR
-lives). The first subwindow after the end of guest memory is used for
-this. The address specified in the msi-address-64 property is the PCI
-address of MSIIR. The hypervisor configures the PAMU to map that address to
-the true physical address of MSIIR.
---
base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b
change-id: 20250226-msipic-yaml-76e3f00bf5ee
Best regards,
--
J. Neuschäfer <j.ne@...teo.net>
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