[PATCH v16 12/14] hmat acpi: Build Memory Side Cache Information Structure(s)

[Tao Xu]

From: Liu Jingqi <address@hidden>

This structure describes memory side cache information for memory
proximity domains if the memory side cache is present and the
physical device forms the memory side cache.
The software could use this information to effectively place
the data in memory to maximize the performance of the system
memory that use the memory side cache.

Reviewed-by: Daniel Black <address@hidden>
Reviewed-by: Jonathan Cameron <address@hidden>
Signed-off-by: Liu Jingqi <address@hidden>
Signed-off-by: Tao Xu <address@hidden>
---

Changes in v16:
    - Use checks and assert to replace masks (Igor)
    - Fields in Cache Attributes are promoted to uint32_t before
      shifting (Igor)
    - Drop cpu_to_le32() (Igor)

Changes in v13:
    - rename level as cache_level
---
 hw/acpi/hmat.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 68 insertions(+), 1 deletion(-)

diff --git a/hw/acpi/hmat.c b/hw/acpi/hmat.c
index ed19ebed2f..2b4f760e0e 100644
--- a/hw/acpi/hmat.c
+++ b/hw/acpi/hmat.c
@@ -144,14 +144,62 @@ static void build_hmat_lb(GArray *table_data, 
HMAT_LB_Info *hmat_lb,
     g_free(entry_list);
 }
 
+/* ACPI 6.3: 5.2.27.5 Memory Side Cache Information Structure: Table 5-147 */
+static void build_hmat_cache(GArray *table_data, HMAT_Cache_Info *hmat_cache,
+                             uint8_t total_levels)
+{
+    /*
+     * Cache Attributes: Bits [3:0] – Total Cache Levels
+     * for this Memory Proximity Domain
+     */
+    uint32_t cache_attr = total_levels;
+
+    /* Bits [7:4] : Cache Level described in this structure */
+    cache_attr |= (uint32_t) hmat_cache->level << 4;
+
+    /* Bits [11:8] - Cache Associativity */
+    cache_attr |= (uint32_t) hmat_cache->associativity << 8;
+
+    /* Bits [15:12] - Write Policy */
+    cache_attr |= (uint32_t) hmat_cache->write_policy << 12;
+
+    /* Bits [31:16] - Cache Line size in bytes */
+    cache_attr |= (uint32_t) hmat_cache->line_size << 16;
+
+    /* Type */
+    build_append_int_noprefix(table_data, 2, 2);
+    /* Reserved */
+    build_append_int_noprefix(table_data, 0, 2);
+    /* Length */
+    build_append_int_noprefix(table_data, 32, 4);
+    /* Proximity Domain for the Memory */
+    build_append_int_noprefix(table_data, hmat_cache->proximity, 4);
+    /* Reserved */
+    build_append_int_noprefix(table_data, 0, 4);
+    /* Memory Side Cache Size */
+    build_append_int_noprefix(table_data, hmat_cache->size, 8);
+    /* Cache Attributes */
+    build_append_int_noprefix(table_data, cache_attr, 4);
+    /* Reserved */
+    build_append_int_noprefix(table_data, 0, 2);
+    /*
+     * Number of SMBIOS handles (n)
+     * Linux kernel uses Memory Side Cache Information Structure
+     * without SMBIOS entries for now, so set Number of SMBIOS handles
+     * as 0.
+     */
+    build_append_int_noprefix(table_data, 0, 2);
+}
+
 /* Build HMAT sub table structures */
 static void hmat_build_table_structs(GArray *table_data, NumaState *numa_state)
 {
     uint16_t flags;
     uint32_t num_initiator = 0;
     uint32_t initiator_list[MAX_NODES];
-    int i, hierarchy, type;
+    int i, hierarchy, type, cache_level, total_levels;
     HMAT_LB_Info *hmat_lb;
+    HMAT_Cache_Info *hmat_cache;
 
     for (i = 0; i < numa_state->num_nodes; i++) {
         flags = 0;
@@ -185,6 +233,25 @@ static void hmat_build_table_structs(GArray *table_data, 
NumaState *numa_state)
             }
         }
     }
+
+    /*
+     * ACPI 6.3: 5.2.27.5 Memory Side Cache Information Structure:
+     * Table 5-147
+     */
+    for (i = 0; i < numa_state->num_nodes; i++) {
+        total_levels = 0;
+        for (cache_level = 1; cache_level < HMAT_LB_LEVELS; cache_level++) {
+            if (numa_state->hmat_cache[i][cache_level]) {
+                total_levels++;
+            }
+        }
+        for (cache_level = 0; cache_level <= total_levels; cache_level++) {
+            hmat_cache = numa_state->hmat_cache[i][cache_level];
+            if (hmat_cache) {
+                build_hmat_cache(table_data, hmat_cache, total_levels);
+            }
+        }
+    }
 }
 
 void build_hmat(GArray *table_data, BIOSLinker *linker, NumaState *numa_state)
-- 
2.20.1