acpi: Add IO Remapping Table structures

Input Output Remapping Table (IORT) represents the IO topology of an Arm
based system.

Document number: ARM DEN 0049E.e, Sep 2022

Change-Id: I4e8e3323caa714a56882939914cac510bf95d30b
Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77884
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/acpi/Kconfig

@@ -86,6 +86,12 @@ config ACPI_GTDT
 	help
 	  Selected by platforms that implement ARM generic timers
 
+config ACPI_IORT
+	def_bool n
+	depends on ARCH_ARM64 && HAVE_ACPI_TABLES
+	help
+	  Selected by platforms that implement ARM IO Remap table.
+
 config MAX_ACPI_TABLE_SIZE_KB
 	int
 	default 144

src/acpi/acpi.c

@@ -14,6 +14,7 @@
  */
 
 #include <acpi/acpi.h>
+#include <acpi/acpi_iort.h>
 #include <acpi/acpi_ivrs.h>
 #include <acpi/acpigen.h>
 #include <cbfs.h>
@@ -1194,6 +1195,26 @@ unsigned long acpi_gtdt_add_watchdog(unsigned long current, uint64_t refresh_fra
 	return current + sizeof(struct acpi_gtdt_watchdog);
 }
 
+static void acpi_create_iort(acpi_header_t *header, void *unused)
+{
+	if (!CONFIG(ACPI_IORT))
+		return;
+
+	acpi_iort_t *iort = (acpi_iort_t *)header;
+	unsigned long current = (unsigned long)iort + sizeof(acpi_iort_t);
+
+	if (acpi_fill_header(header, "IORT", IORT, sizeof(acpi_iort_t)) != CB_SUCCESS)
+		return;
+
+	iort->node_count = 0;
+	iort->node_offset = current - (unsigned long)iort;
+
+	current = acpi_soc_fill_iort(iort, current);
+
+	/* (Re)calculate length */
+	header->length = current - (unsigned long)iort;
+}
+
 unsigned long acpi_create_lpi_desc_ncst(acpi_lpi_desc_ncst_t *lpi_desc, uint16_t uid)
 {
 	memset(lpi_desc, 0, sizeof(acpi_lpi_desc_ncst_t));
@@ -1409,6 +1430,7 @@ unsigned long write_acpi_tables(const unsigned long start)
 		{ acpi_create_spcr, NULL, sizeof(acpi_spcr_t) },
 		{ acpi_create_gtdt, NULL, sizeof(acpi_gtdt_t) },
 		{ acpi_create_pptt, NULL, sizeof(acpi_pptt_t) },
+		{ acpi_create_iort, NULL, sizeof(acpi_iort_t) },
 	};
 
 	current = start;
@@ -1760,6 +1782,8 @@ int get_acpi_table_revision(enum acpi_tables table)
 		return 3;
 	case PPTT: /* ACPI 6.4 */
 		return 3;
+	case IORT: /* IO Remapping Table E.e */
+		return 6;
 	default:
 		return -1;
 	}

src/include/acpi/acpi.h

@@ -105,6 +105,7 @@ enum acpi_tables {
 	XSDT,   /* Extended System Description Table */
 	/* Additional proprietary tables used by coreboot */
 	CRAT,   /* Component Resource Attribute Table */
+	IORT,   /* Input Output Remapping Table */
 	NHLT,   /* Non HD audio Link Table */
 	SPMI,   /* Server Platform Management Interface table */
 	VFCT    /* VBIOS Fetch Table */

src/include/acpi/acpi_iort.h

@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ACPI_IORT_H__
+#define __ACPI_IORT_H__
+
+#include <acpi/acpi.h>
+#include <types.h>
+
+/* IORT - IO Remapping Table revision 6
+ * Document number: ARM DEN 0049E.e, Sep 2022
+ */
+typedef struct acpi_table_iort {
+	acpi_header_t header;	/* Common ACPI table header */
+	u32 node_count;
+	u32 node_offset;
+	u32 reserved;
+} __packed acpi_iort_t;
+
+/*
+ * IORT subtables
+ */
+typedef struct acpi_iort_node {
+	u8 type;
+	u16 length;
+	u8 revision;
+	u32 identifier;
+	u32 mapping_count;
+	u32 mapping_offset;
+	char node_data[];
+} __packed acpi_iort_node_t;
+
+/* Values for subtable Type above */
+enum acpi_iort_node_type {
+	ACPI_IORT_NODE_ITS_GROUP = 0x00,
+	ACPI_IORT_NODE_NAMED_COMPONENT = 0x01,
+	ACPI_IORT_NODE_PCI_ROOT_COMPLEX = 0x02,
+	ACPI_IORT_NODE_SMMU = 0x03,
+	ACPI_IORT_NODE_SMMU_V3 = 0x04,
+	ACPI_IORT_NODE_PMCG = 0x05,
+	ACPI_IORT_NODE_RMR = 0x06,
+};
+
+/* ITS Group revision 1 */
+typedef struct acpi_iort_its_group {
+	u32 its_count;
+	u32 identifiers[];	/* GIC ITS identifier array */
+} __packed acpi_iort_its_group_t;
+
+/* SMMUv3 revision 5 */
+typedef struct acpi_iort_smmu_v3 {
+	u64 base_address;	/* SMMUv3 base address */
+	u32 flags;
+	u32 reserved;
+	u64 vatos_address;
+	u32 model;
+	u32 event_gsiv;
+	u32 pri_gsiv;
+	u32 gerr_gsiv;
+	u32 sync_gsiv;
+	u32 pxm;
+	u32 id_mapping_index;
+} __packed acpi_iort_smmu_v3_t;
+
+/* Masks for Flags field above */
+#define ACPI_IORT_SMMU_V3_COHACC_OVERRIDE   (1)
+#define ACPI_IORT_SMMU_V3_HTTU_OVERRIDE     (3<<1)
+#define ACPI_IORT_SMMU_V3_PXM_VALID         (1<<3)
+#define ACPI_IORT_SMMU_V3_DEVICEID_VALID    (1<<4)
+
+typedef struct acpi_iort_id_mapping {
+	u32 input_base;		/* Lowest value in input range */
+	u32 id_count;		/* Number of IDs */
+	u32 output_base;	/* Lowest value in output range */
+	u32 output_reference;	/* A reference to the output node */
+	u32 flags;
+} __packed acpi_iort_id_mapping_t;
+
+/* Masks for Flags field above for IORT subtable */
+#define ACPI_IORT_ID_SINGLE_MAPPING (1)
+
+/* Named Component revision 4 */
+typedef struct acpi_iort_named_component {
+	u32 node_flags;
+	u64 memory_properties;	/* Memory access properties */
+	u8 memory_address_limit;	/* Memory address size limit */
+	char device_name[];	/* Path of namespace object */
+} __packed acpi_iort_named_component_t;
+
+/* Masks for Flags field above */
+#define ACPI_IORT_NC_STALL_SUPPORTED    (1)
+#define ACPI_IORT_NC_PASID_BITS         (31<<1)
+
+typedef struct acpi_iort_root_complex {
+	u64 memory_properties;	/* Memory access properties */
+	u32 ats_attribute;
+	u32 pci_segment_number;
+	u8 memory_address_limit;/* Memory address size limit */
+	u16 pasid_capabilities;	/* PASID Capabilities */
+	u8 reserved;		/* Reserved, must be zero */
+	u32 flags;		/* Flags */
+} __packed acpi_iort_root_complex_t;
+
+/* Masks for ats_attribute field above */
+#define ACPI_IORT_ATS_SUPPORTED         (1)	/* The root complex ATS support */
+#define ACPI_IORT_PRI_SUPPORTED         (1<<1)	/* The root complex PRI support */
+#define ACPI_IORT_PASID_FWD_SUPPORTED   (1<<2)	/* The root complex PASID forward support */
+
+/* Masks for pasid_capabilities field above */
+#define ACPI_IORT_PASID_MAX_WIDTH       (0x1F)	/* Bits 0-4 */
+
+unsigned long acpi_soc_fill_iort(acpi_iort_t *iort, unsigned long current);
+
+#endif