Change in coreboot[master]: acpi: add Generic Initiator Affinity structure for SRAT

[Jonathan Zhang (Code Review)]

Attention is currently required from: Lance Zhao, Tim Wawrzynczak.
Jonathan Zhang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/52734 )

Change subject: acpi: add Generic Initiator Affinity structure for SRAT
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acpi: add Generic Initiator Affinity structure for SRAT

Generic Initiator Affinity structure is introdcued in ACPI spec 6.3.

This structure is used to define NUMA affinity domain which is
established by generic initiator (such as by CXL device).

Signed-off-by: Jonathan Zhang 
Change-Id: Ic6ef01c59e02f30dc290f27e741027e16f5d8359
---
M src/acpi/acpi.c
M src/include/acpi/acpi.h
2 files changed, 34 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/52734/1

diff --git a/src/acpi/acpi.c b/src/acpi/acpi.c
index 6c226fc..cdf49d4 100644
--- a/src/acpi/acpi.c
+++ b/src/acpi/acpi.c
@@ -508,6 +508,22 @@
    return mem->length;
 }

+int acpi_create_srat_git_pci(acpi_srat_gia_t *gia, u32 proximity_domain,
+	u16 seg, u8 bus, u8 dev, u8 func, u32 flags);
+{
+	gia->type = 5; /* Generic Initiator Affinity structure */
+	gia->length = sizeof(acpi_srat_gia_t);
+	gia->proximity_domain = proximity_domain;
+	gia->dev_handle_type = 1; /* PCIe device handle */
+	memcpy(gia->devhandle, seg, sizeof(seg)); /* First two bytes has segment number */
+	gia->dev_handle[2] = bus; /* Byte 2 has bus number */
+	/* Byte 3 has bits 7:3 for dev, bits 2:0 for func */
+	gia->dev_handle[3] = (((dev) & 0x1F) << 3) | ((func) & 0x07);
+	gia->flags = flags;
+
+	return gia->length;
+}
+
 /* http://www.microsoft.com/whdc/system/sysinternals/sratdwn.mspx */
 void acpi_create_srat(acpi_srat_t *srat,
    	      unsigned long (*acpi_fill_srat)(unsigned long current))
diff --git a/src/include/acpi/acpi.h b/src/include/acpi/acpi.h
index 338f289..af0adad 100644
--- a/src/include/acpi/acpi.h
+++ b/src/include/acpi/acpi.h
@@ -305,6 +305,18 @@
    u32 resv2[2];
 } __packed acpi_srat_mem_t;

+/* SRAT: Generic Initiator Affinity Structure (ACPI spec 6.4 section 5.2.16.6) */
+typedef struct acpi_srat_gia {
+	u8 type;		/* Type (5) */
+	u8 length;		/* Length in bytes (32) */
+	u8 resv;
+	u8 dev_handle_type;	/* Device handle type */
+	u32 proximity_domain;	/*Proximity domain */
+	u8 dev_handle[16];	/* Device handle */
+	u32 flags;
+	u32 resv1;
+} __packed acpi_srat_gia_t;
+
 /* SLIT (System Locality Distance Information Table) */
 typedef struct acpi_slit {
    acpi_header_t header;
@@ -1085,6 +1097,12 @@
 int acpi_create_srat_lapic(acpi_srat_lapic_t *lapic, u8 node, u8 apic);
 int acpi_create_srat_mem(acpi_srat_mem_t *mem, u8 node, u32 basek, u32 sizek,
    		 u32 flags);
+/*
+ * Given the Generic Initiator device's BDF, the proximity domain's ID
+ * and flag, create Generic Initiator Affinity structure in SRAT.
+ */
+int acpi_create_srat_gia_pci(acpi_srat_gia_t *gia, u32 proximity_domain,
+		u16 seg, u8 bus, u8 dev, u8 func, u32 flags);
 int acpi_create_mcfg_mmconfig(acpi_mcfg_mmconfig_t *mmconfig, u32 base,
    		      u16 seg_nr, u8 start, u8 end);
 unsigned long acpi_create_srat_lapics(unsigned long current);