linux-kernel - [PATCH v2 1/4] ACPICA: Define MRRM ACPI table

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Message-ID: <20250227224828.306537-2-tony.luck@intel.com>
Date: Thu, 27 Feb 2025 14:48:25 -0800
From: Tony Luck <tony.luck@...el.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v2 1/4] ACPICA: Define MRRM ACPI table

Patch for reference, this has already been applied to
https://github.com/acpica/acpica and will in due course make its way
into Linux when the next ACPICA release is ported over.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 include/acpi/actbl1.h |  7 +++++++
 include/acpi/actbl2.h | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 387fc821703a..07cb62541884 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -110,6 +110,13 @@ struct acpi_whea_header {
 	u64 mask;		/* Bitmask required for this register instruction */
 };
 
+/* Larger subtable header (when Length can exceed 255) */
+
+struct acpi_subtable_header_16 {
+	u16 type;
+	u16 length;
+};
+
 /* https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/acpitabl/ns-acpitabl-aspt_table */
 #define ASPT_REVISION_ID 0x01
 struct acpi_table_aspt {
diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index 2e917a8f8bca..662a1bc927ea 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -37,6 +37,7 @@
 #define ACPI_SIG_MCHI           "MCHI"	/* Management Controller Host Interface table */
 #define ACPI_SIG_MPAM           "MPAM"	/* Memory System Resource Partitioning and Monitoring Table */
 #define ACPI_SIG_MPST           "MPST"	/* Memory Power State Table */
+#define ACPI_SIG_MRRM           "MRRM"      /* Memory Range and Region Mapping table */
 #define ACPI_SIG_MSDM           "MSDM"	/* Microsoft Data Management Table */
 #define ACPI_SIG_NFIT           "NFIT"	/* NVDIMM Firmware Interface Table */
 #define ACPI_SIG_NHLT           "NHLT"	/* Non HD Audio Link Table */
@@ -1736,6 +1737,47 @@ struct acpi_msct_proximity {
 	u64 memory_capacity;	/* In bytes */
 };
 
+/*******************************************************************************
+ *
+ * MRRM - Memory Range and Region Mapping (MRRM) table
+ * Conforms to "Intel Resource Director Technology Architecture Specification"
+ * Version 1.1, January 2025
+ *
+ ******************************************************************************/
+
+struct acpi_table_mrrm {
+	struct acpi_table_header header;	/* Common ACPI table header */
+	u8 max_mem_region;			/* Max Memory Regions supported */
+	u8 flags;				/* Region assignment type */
+	u8 reserved[26];
+	u8 memory_range_entry[];
+};
+
+/* Flags */
+#define ACPI_MRRM_FLAGS_REGION_ASSIGNMENT_OS (1<<0)
+
+/*******************************************************************************
+	*
+	* Memory Range entry - Memory Range entry in MRRM table
+	*
+	******************************************************************************/
+
+struct acpi_mrrm_mem_range_entry {
+	struct acpi_subtable_header_16 header;
+	u32 reserved0;		/* Reserved */
+	u64 addr_base;		/* Base addr of the mem range */
+	u64 addr_len;		/* Length of the mem range */
+	u16 region_id_flags;	/* Valid local or remote Region-ID */
+	u8 local_region_id;	/* Platform-assigned static local Region-ID */
+	u8 remote_region_id;	/* Platform-assigned static remote Region-ID */
+	u32 reserved1;		/* Reserved */
+	/* Region-ID Programming Registers[] */
+};
+
+/* Values for region_id_flags above */
+#define ACPI_MRRM_VALID_REGION_ID_FLAGS_LOCAL   (1<<0)
+#define ACPI_MRRM_VALID_REGION_ID_FLAGS_REMOTE  (1<<1)
+
 /*******************************************************************************
  *
  * MSDM - Microsoft Data Management table
-- 
2.48.1