linux-kernel - [PATCH v6 2/6] acpi: Add HMAT to generic parsing tables

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Date:   Mon, 17 Dec 2018 20:23:33 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     Keith Busch <keith.busch@...el.com>, peterz@...radead.org,
        dave.hansen@...ux.intel.com, linux-mm@...ck.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, mgorman@...e.de
Subject: [PATCH v6 2/6] acpi: Add HMAT to generic parsing tables

From: Keith Busch <keith.busch@...el.com>

The HMAT table header has different field lengths than the existing
parsing uses. Add the HMAT type to the parsing rules so it may be
generically parsed.

Signed-off-by: Keith Busch <keith.busch@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/acpi/tables.c |    9 +++++++++
 include/linux/acpi.h  |    1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index e9643b4267c7..bc1addf715dc 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -51,6 +51,7 @@ static int acpi_apic_instance __initdata;
 
 enum acpi_subtable_type {
 	ACPI_SUBTABLE_COMMON,
+	ACPI_SUBTABLE_HMAT,
 };
 
 struct acpi_subtable_entry {
@@ -232,6 +233,8 @@ acpi_get_entry_type(struct acpi_subtable_entry *entry)
 	switch (entry->type) {
 	case ACPI_SUBTABLE_COMMON:
 		return entry->hdr->common.type;
+	case ACPI_SUBTABLE_HMAT:
+		return entry->hdr->hmat.type;
 	}
 	return 0;
 }
@@ -242,6 +245,8 @@ acpi_get_entry_length(struct acpi_subtable_entry *entry)
 	switch (entry->type) {
 	case ACPI_SUBTABLE_COMMON:
 		return entry->hdr->common.length;
+	case ACPI_SUBTABLE_HMAT:
+		return entry->hdr->hmat.length;
 	}
 	return 0;
 }
@@ -252,6 +257,8 @@ acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
 	switch (entry->type) {
 	case ACPI_SUBTABLE_COMMON:
 		return sizeof(entry->hdr->common);
+	case ACPI_SUBTABLE_HMAT:
+		return sizeof(entry->hdr->hmat);
 	}
 	return 0;
 }
@@ -259,6 +266,8 @@ acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
 static enum acpi_subtable_type __init
 acpi_get_subtable_type(char *id)
 {
+	if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
+		return ACPI_SUBTABLE_HMAT;
 	return ACPI_SUBTABLE_COMMON;
 }
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 18805a967c70..4373f5ba0f95 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -143,6 +143,7 @@ enum acpi_address_range_id {
 /* Table Handlers */
 union acpi_subtable_headers {
 	struct acpi_subtable_header common;
+	struct acpi_hmat_structure hmat;
 };
 
 typedef int (*acpi_tbl_table_handler)(struct acpi_table_header *table);