[PATCH v14 09/11] hmat acpi: Build System Locality Latency and Bandwidth Information Structure(s)

[Tao Xu <tao3.xu@intel.com>]

From: Liu Jingqi <jingqi.liu@intel.com>

This structure describes the memory access latency and bandwidth
information from various memory access initiator proximity domains.
The latency and bandwidth numbers represented in this structure
correspond to rated latency and bandwidth for the platform.
The software could use this information as hint for optimization.

Signed-off-by: Liu Jingqi <jingqi.liu@intel.com>
Signed-off-by: Tao Xu <tao3.xu@intel.com>
---

No changes in v14.

Changes in v13:
    - Calculate the entries in a new patch.
---
 hw/acpi/hmat.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 95 insertions(+), 1 deletion(-)

diff --git a/hw/acpi/hmat.c b/hw/acpi/hmat.c
index c595098ba7..6ec1310e62 100644
--- a/hw/acpi/hmat.c
+++ b/hw/acpi/hmat.c
@@ -27,6 +27,7 @@
 #include "qemu/osdep.h"
 #include "sysemu/numa.h"
 #include "hw/acpi/hmat.h"
+#include "qemu/error-report.h"
 
 /*
  * ACPI 6.3:
@@ -67,11 +68,81 @@ static void build_hmat_mpda(GArray *table_data, uint16_t flags,
     build_append_int_noprefix(table_data, 0, 8);
 }
 
+/*
+ * ACPI 6.3: 5.2.27.4 System Locality Latency and Bandwidth Information
+ * Structure: Table 5-146
+ */
+static void build_hmat_lb(GArray *table_data, HMAT_LB_Info *hmat_lb,
+                          uint32_t num_initiator, uint32_t num_target,
+                          uint32_t *initiator_list)
+{
+    int i;
+    uint16_t *lb_data;
+    uint32_t base;
+    /*
+     * Length in bytes for entire structure, including 32 bytes of
+     * fixed length, length of initiator proximity domain list,
+     * length of target proximity domain list and length of entries
+     * provides latency/bandwidth values.
+     */
+    uint32_t lb_length = 32 + 4 * num_initiator + 4 * num_target +
+                              2 * num_initiator * num_target;
+
+    /* Type */
+    build_append_int_noprefix(table_data, 1, 2);
+    /* Reserved */
+    build_append_int_noprefix(table_data, 0, 2);
+    /* Length */
+    build_append_int_noprefix(table_data, lb_length, 4);
+    /* Flags: Bits [3:0] Memory Hierarchy, Bits[7:4] Reserved */
+    assert(!(hmat_lb->hierarchy >> 4));
+    build_append_int_noprefix(table_data, hmat_lb->hierarchy, 1);
+    /* Data Type */
+    build_append_int_noprefix(table_data, hmat_lb->data_type, 1);
+    /* Reserved */
+    build_append_int_noprefix(table_data, 0, 2);
+    /* Number of Initiator Proximity Domains (s) */
+    build_append_int_noprefix(table_data, num_initiator, 4);
+    /* Number of Target Proximity Domains (t) */
+    build_append_int_noprefix(table_data, num_target, 4);
+    /* Reserved */
+    build_append_int_noprefix(table_data, 0, 4);
+
+    if (hmat_lb->data_type <= HMAT_LB_DATA_WRITE_LATENCY) {
+        base = hmat_lb->base_latency;
+        lb_data = hmat_lb->entry_latency;
+    } else {
+        base = hmat_lb->base_bandwidth;
+        lb_data = hmat_lb->entry_bandwidth;
+    }
+
+    /* Entry Base Unit */
+    build_append_int_noprefix(table_data, base, 8);
+
+    /* Initiator Proximity Domain List */
+    for (i = 0; i < num_initiator; i++) {
+        build_append_int_noprefix(table_data, initiator_list[i], 4);
+    }
+
+    /* Target Proximity Domain List */
+    for (i = 0; i < num_target; i++) {
+        build_append_int_noprefix(table_data, i, 4);
+    }
+
+    /* Latency or Bandwidth Entries */
+    for (i = 0; i < num_initiator * num_target; i++) {
+        build_append_int_noprefix(table_data, lb_data[i], 2);
+    }
+}
+
 /* Build HMAT sub table structures */
 static void hmat_build_table_structs(GArray *table_data, NumaState *numa_state)
 {
     uint16_t flags;
-    int i;
+    uint32_t num_initiator = 0;
+    uint32_t initiator_list[MAX_NODES];
+    int i, hierarchy, type;
+    HMAT_LB_Info *hmat_lb;
 
     for (i = 0; i < numa_state->num_nodes; i++) {
         flags = 0;
@@ -82,6 +153,29 @@ static void hmat_build_table_structs(GArray *table_data, NumaState *numa_state)
 
         build_hmat_mpda(table_data, flags, numa_state->nodes[i].initiator, i);
     }
+
+    for (i = 0; i < numa_state->num_nodes; i++) {
+        if (numa_state->nodes[i].has_cpu) {
+            initiator_list[num_initiator++] = i;
+        }
+    }
+
+    /*
+     * ACPI 6.3: 5.2.27.4 System Locality Latency and Bandwidth Information
+     * Structure: Table 5-146
+     */
+    for (hierarchy = HMAT_LB_MEM_MEMORY;
+         hierarchy <= HMAT_LB_MEM_CACHE_3RD_LEVEL; hierarchy++) {
+        for (type = HMAT_LB_DATA_ACCESS_LATENCY;
+             type <= HMAT_LB_DATA_WRITE_BANDWIDTH; type++) {
+            hmat_lb = numa_state->hmat_lb[hierarchy][type];
+
+            if (hmat_lb) {
+                build_hmat_lb(table_data, hmat_lb, num_initiator,
+                              numa_state->num_nodes, initiator_list);
+            }
+        }
+    }
 }
 
 void build_hmat(GArray *table_data, BIOSLinker *linker, NumaState *numa_state)
-- 
2.20.1