[v10,08/11] hmat acpi: Build Memory Side Cache Information Structure(s)

Commit Message

Tao Xu Sept. 1, 2019, 2:21 p.m. UTC

From: Liu Jingqi <[e-mail]>

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 <[e-mail]>
Reviewed-by: Jonathan Cameron <[e-mail]>
Signed-off-by: Liu Jingqi <[e-mail]>
Signed-off-by: Tao Xu <[e-mail]>
---

No changes in v10
---
 hw/acpi/hmat.c          | 64 ++++++++++++++++++++++++++++++++++++++++-
 hw/acpi/hmat.h          | 17 +++++++++++
 include/qemu/typedefs.h |  1 +
 include/sysemu/numa.h   |  5 ++++
 4 files changed, 86 insertions(+), 1 deletion(-)

Patch

diff --git a/hw/acpi/hmat.c b/hw/acpi/hmat.c
index 27e7ff63f8..71d8950241 100644
--- a/hw/acpi/hmat.c
+++ b/hw/acpi/hmat.c
@@ -134,14 +134,63 @@  static void build_hmat_lb(GArray *table_data, HMAT_LB_Info *hmat_lb,
     }
 }
 
+/* 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)
+{
+    /*
+     * Cache Attributes: Bits [3:0] – Total Cache Levels
+     * for this Memory Proximity Domain
+     */
+    uint32_t cache_attr = hmat_cache->total_levels & 0xF;
+
+    /* Bits [7:4] : Cache Level described in this structure */
+    cache_attr |= (hmat_cache->level & 0xF) << 4;
+
+    /* Bits [11:8] - Cache Associativity */
+    cache_attr |= (hmat_cache->associativity & 0xF) << 8;
+
+    /* Bits [15:12] - Write Policy */
+    cache_attr |= (hmat_cache->write_policy & 0xF) << 12;
+
+    /* Bits [31:16] - Cache Line size in bytes */
+    cache_attr |= (hmat_cache->line_size & 0xFFFF) << 16;
+
+    cache_attr = cpu_to_le32(cache_attr);
+
+    /* 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->mem_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 *nstat)
 {
     uint16_t flags;
     uint32_t num_initiator = 0;
     uint32_t initiator_pxm[MAX_NODES];
-    int i, hrchy, type;
+    int i, hrchy, type, level;
     HMAT_LB_Info *numa_hmat_lb;
+    HMAT_Cache_Info *numa_hmat_cache;
 
     for (i = 0; i < nstat->num_nodes; i++) {
         flags = 0;
@@ -175,6 +224,19 @@  static void hmat_build_table_structs(GArray *table_data, NumaState *nstat)
             }
         }
     }
+
+    /*
+     * ACPI 6.3: 5.2.27.5 Memory Side Cache Information Structure:
+     * Table 5-147
+     */
+    for (i = 0; i < nstat->num_nodes; i++) {
+        for (level = 0; level <= MAX_HMAT_CACHE_LEVEL; level++) {
+            numa_hmat_cache = nstat->hmat_cache[i][level];
+            if (numa_hmat_cache) {
+                build_hmat_cache(table_data, numa_hmat_cache);
+            }
+        }
+    }
 }
 
 void build_hmat(GArray *table_data, BIOSLinker *linker, NumaState *nstat)
diff --git a/hw/acpi/hmat.h b/hw/acpi/hmat.h
index 79ddb873c1..1373f22b27 100644
--- a/hw/acpi/hmat.h
+++ b/hw/acpi/hmat.h
@@ -81,6 +81,23 @@  struct HMAT_LB_Info {
     uint16_t    bandwidth[MAX_NODES][MAX_NODES];
 };
 
+struct HMAT_Cache_Info {
+    /* The memory proximity domain to which the memory belongs. */
+    uint32_t    mem_proximity;
+    /* Size of memory side cache in bytes. */
+    uint64_t    size;
+    /* Total cache levels for this memory proximity domain. */
+    uint8_t     total_levels;
+    /* Cache level described in this structure. */
+    uint8_t     level;
+    /* Cache Associativity: None/Direct Mapped/Comple Cache Indexing */
+    uint8_t     associativity;
+    /* Write Policy: None/Write Back(WB)/Write Through(WT) */
+    uint8_t     write_policy;
+    /* Cache Line size in bytes. */
+    uint16_t    line_size;
+};
+
 void build_hmat(GArray *table_data, BIOSLinker *linker, NumaState *nstat);
 
 #endif
diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
index ad8955ecd8..426fd503f0 100644
--- a/include/qemu/typedefs.h
+++ b/include/qemu/typedefs.h
@@ -49,6 +49,7 @@  typedef struct FWCfgEntry FWCfgEntry;
 typedef struct FWCfgIoState FWCfgIoState;
 typedef struct FWCfgMemState FWCfgMemState;
 typedef struct FWCfgState FWCfgState;
+typedef struct HMAT_Cache_Info HMAT_Cache_Info;
 typedef struct HMAT_LB_Info HMAT_LB_Info;
 typedef struct HostMemoryBackend HostMemoryBackend;
 typedef struct HVFX86EmulatorState HVFX86EmulatorState;
diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h
index 8dbf76c5b4..dc48d39439 100644
--- a/include/sysemu/numa.h
+++ b/include/sysemu/numa.h
@@ -35,6 +35,8 @@  enum {
 #define HMAT_LB_LEVELS    (HMAT_LB_MEM_CACHE_3RD_LEVEL + 1)
 #define HMAT_LB_TYPES     (HMAT_LB_DATA_WRITE_BANDWIDTH + 1)
 
+#define MAX_HMAT_CACHE_LEVEL        3
+
 struct NodeInfo {
     uint64_t node_mem;
     struct HostMemoryBackend *node_memdev;
@@ -65,6 +67,9 @@  struct NumaState {
 
     /* NUMA modes HMAT Locality Latency and Bandwidth Information */
     HMAT_LB_Info *hmat_lb[HMAT_LB_LEVELS][HMAT_LB_TYPES];
+
+    /* Memory Side Cache Information Structure */
+    HMAT_Cache_Info *hmat_cache[MAX_NODES][MAX_HMAT_CACHE_LEVEL + 1];
 };
 typedef struct NumaState NumaState;