[PULL v3 15/32] hmat acpi: Build System Locality Latency and Bandwidth Information Structure(s)

["Michael S. Tsirkin" <mst@redhat.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.

Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Liu Jingqi <jingqi.liu@intel.com>
Signed-off-by: Tao Xu <tao3.xu@intel.com>
Message-Id: <20191213011929.2520-6-tao3.xu@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/acpi/hmat.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 103 insertions(+), 1 deletion(-)

diff --git a/hw/acpi/hmat.c b/hw/acpi/hmat.c
index 9ff79308a4..4635d45dee 100644
--- a/hw/acpi/hmat.c
+++ b/hw/acpi/hmat.c
@@ -25,6 +25,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "sysemu/numa.h"
 #include "hw/acpi/hmat.h"
 
@@ -67,11 +68,89 @@ 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, index;
+    HMAT_LB_Data *lb_data;
+    uint16_t *entry_list;
+    uint32_t base;
+    /* Length in bytes for entire structure */
+    uint32_t lb_length
+        = 32 /* Table length upto and including Entry Base Unit */
+        + 4 * num_initiator /* Initiator Proximity Domain List */
+        + 4 * num_target /* Target Proximity Domain List */
+        + 2 * num_initiator * num_target; /* Latency or Bandwidth Entries */
+
+    /* 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);
+
+    /* Entry Base Unit */
+    if (hmat_lb->data_type <= HMAT_LB_DATA_WRITE_LATENCY) {
+        /* Convert latency base from nanoseconds to picosecond */
+        base = hmat_lb->base * 1000;
+    } else {
+        /* Convert bandwidth base from Byte to Megabyte */
+        base = hmat_lb->base / MiB;
+    }
+    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 */
+    entry_list = g_malloc0(num_initiator * num_target * sizeof(uint16_t));
+    for (i = 0; i < hmat_lb->list->len; i++) {
+        lb_data = &g_array_index(hmat_lb->list, HMAT_LB_Data, i);
+        index = lb_data->initiator * num_target + lb_data->target;
+
+        entry_list[index] = (uint16_t)(lb_data->data / hmat_lb->base);
+    }
+
+    for (i = 0; i < num_initiator * num_target; i++) {
+        build_append_int_noprefix(table_data, entry_list[i], 2);
+    }
+
+    g_free(entry_list);
+}
+
 /* 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 +161,29 @@ 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 && hmat_lb->list->len) {
+                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)
-- 
MST