linux-kernel - [PATCHv6 09/10] acpi/hmat: Register memory side cache attributes

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Date:   Thu, 14 Feb 2019 10:10:16 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Keith Busch <keith.busch@...el.com>
Subject: [PATCHv6 09/10] acpi/hmat: Register memory side cache attributes

Register memory side cache attributes with the memory's node if HMAT
provides the side cache iniformation table.

Signed-off-by: Keith Busch <keith.busch@...el.com>
---
 drivers/acpi/hmat/hmat.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/acpi/hmat/hmat.c b/drivers/acpi/hmat/hmat.c
index 6833c4897ff4..e2a15f53fe45 100644
--- a/drivers/acpi/hmat/hmat.c
+++ b/drivers/acpi/hmat/hmat.c
@@ -314,6 +314,7 @@ static __init int hmat_parse_cache(union acpi_subtable_headers *header,
 				   const unsigned long end)
 {
 	struct acpi_hmat_cache *cache = (void *)header;
+	struct node_cache_attrs cache_attrs;
 	u32 attrs;
 
 	if (cache->header.length < sizeof(*cache)) {
@@ -327,6 +328,37 @@ static __init int hmat_parse_cache(union acpi_subtable_headers *header,
 		cache->memory_PD, cache->cache_size, attrs,
 		cache->number_of_SMBIOShandles);
 
+	cache_attrs.size = cache->cache_size;
+	cache_attrs.level = (attrs & ACPI_HMAT_CACHE_LEVEL) >> 4;
+	cache_attrs.line_size = (attrs & ACPI_HMAT_CACHE_LINE_SIZE) >> 16;
+
+	switch ((attrs & ACPI_HMAT_CACHE_ASSOCIATIVITY) >> 8) {
+	case ACPI_HMAT_CA_DIRECT_MAPPED:
+		cache_attrs.associativity = NODE_CACHE_DIRECT_MAP;
+		break;
+	case ACPI_HMAT_CA_COMPLEX_CACHE_INDEXING:
+		cache_attrs.associativity = NODE_CACHE_INDEXED;
+		break;
+	case ACPI_HMAT_CA_NONE:
+	default:
+		cache_attrs.associativity = NODE_CACHE_OTHER;
+		break;
+	}
+
+	switch ((attrs & ACPI_HMAT_WRITE_POLICY) >> 12) {
+	case ACPI_HMAT_CP_WB:
+		cache_attrs.write_policy = NODE_CACHE_WRITE_BACK;
+		break;
+	case ACPI_HMAT_CP_WT:
+		cache_attrs.write_policy = NODE_CACHE_WRITE_THROUGH;
+		break;
+	case ACPI_HMAT_CP_NONE:
+	default:
+		cache_attrs.write_policy = NODE_CACHE_WRITE_OTHER;
+		break;
+	}
+
+	node_add_cache(pxm_to_node(cache->memory_PD), &cache_attrs);
 	return 0;
 }
 
-- 
2.14.4