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

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Message-ID: <20250210211223.6139-2-tony.luck@intel.com>
Date: Mon, 10 Feb 2025 13:12:20 -0800
From: Tony Luck <tony.luck@...el.com>
To: Robert Moore <robert.moore@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org,
	acpica-devel@...ts.linux.dev,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	David Hildenbrand <david@...hat.com>,
	Oscar Salvador <osalvador@...e.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Fenghua Yu <fenghua.yu@...el.com>,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH 1/4] ACPICA: Define MRRM ACPI table

From: Fenghua Yu <fenghua.yu@...el.com>

The MRRM table describes association between physical address ranges
and "region numbers". This is used by:

1) The /sys/fs/resctrl filesystem to report memory traffic per-RMID for
each region.
2) Perf subsystem to report memory related uncore events per region.

Structure defined in the Intel Resource Director Technology (RDT)
Architecture specification downloadable from www.intel.com/sdm

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 include/acpi/actbl3.h | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
index 5cd755143b7d..1b9a03ff73ba 100644
--- a/include/acpi/actbl3.h
+++ b/include/acpi/actbl3.h
@@ -42,6 +42,7 @@
 #define ACPI_SIG_WSMT           "WSMT"	/* Windows SMM Security Mitigations Table */
 #define ACPI_SIG_XENV           "XENV"	/* Xen Environment table */
 #define ACPI_SIG_XXXX           "XXXX"	/* Intermediate AML header for ASL/ASL+ converter */
+#define ACPI_SIG_MRRM           "MRRM"	/* Memory Range and Region Mapping table */
 
 /*
  * All tables must be byte-packed to match the ACPI specification, since
@@ -793,6 +794,45 @@ struct acpi_table_xenv {
 	u8 event_flags;
 };
 
+/*******************************************************************************
+ *
+ * MRRM - Memory Range and Region Mapping (MRRM) table
+ *
+ ******************************************************************************/
+
+struct acpi_table_mrrm {
+	struct acpi_table_header header;
+	u8 max_mem_region;	/* Max Memory Regions supported */
+	u8 flags;		/* Region assignment type */
+	u8 reserved[26];
+	/* Memory range entry array */
+};
+#define ACPI_MRRM_FLAGS_REGION_ASSIGNMENT_OS	(1<<0)
+
+/*******************************************************************************
+ *
+ * Memory Range entry - Memory Range entry in MRRM table
+ *
+ ******************************************************************************/
+
+struct acpi_table_mrrm_mem_range_entry {
+	u16 type;		/* Type 0="MRRM" */
+	u16 length;		/* 32B + sizeof(Region-ID Programming Reg[]) */
+	u32 reserved;		/* Reserved */
+	u32 base_addr_low;	/* Low 32 bits of base addr of the mem range */
+	u32 base_addr_high;	/* High 32 bits of base addr of the mem range */
+	u32 len_low;		/* Low 32 bits of length of the mem range */
+	u32 len_high;		/* High 32 bits of 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[] */
+};
+
+#define ACPI_MRRM_VALID_REGION_ID_FLAGS_LOCAL 	(1<<0)
+#define ACPI_MRRM_VALID_REGION_ID_FLAGS_REMOTE	(1<<1)
+
 /* Reset to default packing */
 
 #pragma pack()
-- 
2.48.1