[PATCH v2] hw/smbios: support for type 7 (cache information)

[Hal Martin <hal.martin@gmail.com>]

This patch adds support for SMBIOS type 7 (Cache Information) to qemu.

level: cache level (1-8)
size: cache size in bytes

Example usage:
-smbios type=7,level=1,size=0x8000

Signed-off-by: Hal Martin <hal.martin@gmail.com>
---
 hw/smbios/smbios.c           | 64 ++++++++++++++++++++++++++++++++++++
 include/hw/firmware/smbios.h | 18 ++++++++++
 qemu-options.hx              |  2 ++
 3 files changed, 84 insertions(+)

diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index a394514264..b71d5b0a92 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -83,6 +83,12 @@ static struct {
     .processor_family = 0x01, /* Other */
 };
 
+struct type7_instance {
+    uint16_t level, size;
+    QTAILQ_ENTRY(type7_instance) next;
+};
+static QTAILQ_HEAD(, type7_instance) type7 = QTAILQ_HEAD_INITIALIZER(type7);
+
 struct type8_instance {
     const char *internal_reference, *external_reference;
     uint8_t connector_type, port_type;
@@ -330,6 +336,23 @@ static const QemuOptDesc qemu_smbios_type4_opts[] = {
     { /* end of list */ }
 };
 
+static const QemuOptDesc qemu_smbios_type7_opts[] = {
+    {
+        .name = "type",
+        .type = QEMU_OPT_NUMBER,
+        .help = "SMBIOS element type",
+    },{
+        .name = "level",
+        .type = QEMU_OPT_NUMBER,
+        .help = "cache level",
+    },{
+        .name = "size",
+        .type = QEMU_OPT_NUMBER,
+        .help = "cache size",
+    },
+    { /* end of list */ }
+};
+
 static const QemuOptDesc qemu_smbios_type8_opts[] = {
     {
         .name = "type",
@@ -733,6 +756,33 @@ static void smbios_build_type_4_table(MachineState *ms, unsigned instance,
     smbios_type4_count++;
 }
 
+static void smbios_build_type_7_table(void)
+{
+    unsigned instance = 0;
+    struct type7_instance *t7;
+    char designation[20];
+
+    QTAILQ_FOREACH(t7, &type7, next) {
+        SMBIOS_BUILD_TABLE_PRE(7, T0_BASE + instance, true);
+        sprintf(designation, "CPU Internal L%d", t7->level);
+        SMBIOS_TABLE_SET_STR(7, socket_designation, designation);
+        /* cache not socketed, enabled, write back */
+        t->cache_configuration =  0x180 | ((t7->level) - 1);
+        t->installed_size =  t7->size;
+        t->maximum_cache_size =  t7->size; /* set max to installed */
+        t->supported_sram_type = 0x10; /* pipeline burst */
+        t->current_sram_type = 0x10; /* pipeline burst */
+        t->cache_speed = 0x1; /* 1 ns */
+        t->error_correction_type = 0x6; /* Multi-bit ECC */
+        t->system_cache_type = 0x05; /* Unified */
+        t->associativity = 0x6; /* Fully Associative */
+        t->maximum_cache_size2 = t7->size;
+        t->installed_cache_size2 = t7->size;
+        SMBIOS_BUILD_TABLE_POST;
+        instance++;
+    }
+}
+
 static void smbios_build_type_8_table(void)
 {
     unsigned instance = 0;
@@ -1120,6 +1170,7 @@ static bool smbios_get_tables_ep(MachineState *ms,
         }
     }
 
+    smbios_build_type_7_table();
     smbios_build_type_8_table();
     smbios_build_type_9_table(errp);
     smbios_build_type_11_table();
@@ -1478,6 +1529,19 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
                            UINT16_MAX);
             }
             return;
+        case 7:
+            if (!qemu_opts_validate(opts, qemu_smbios_type7_opts, errp)) {
+                return;
+            }
+            struct type7_instance *t7_i;
+            t7_i = g_new0(struct type7_instance, 1);
+            t7_i->level = qemu_opt_get_number(opts, "level", 0x0);
+            t7_i->size = qemu_opt_get_number(opts, "size", 0x0200);
+            /* Only cache levels 1-8 are permitted */
+            if (t7_i->level > 0 && t7_i->level < 9) {
+                QTAILQ_INSERT_TAIL(&type7, t7_i, next);
+            }
+            return;
         case 8:
             if (!qemu_opts_validate(opts, qemu_smbios_type8_opts, errp)) {
                 return;
diff --git a/include/hw/firmware/smbios.h b/include/hw/firmware/smbios.h
index f066ab7262..1ea1506b46 100644
--- a/include/hw/firmware/smbios.h
+++ b/include/hw/firmware/smbios.h
@@ -220,6 +220,24 @@ typedef enum smbios_type_4_len_ver {
     SMBIOS_TYPE_4_LEN_V30 = offsetofend(struct smbios_type_4, thread_count2),
 } smbios_type_4_len_ver;
 
+/* SMBIOS type 7 - Cache Information (v2.0+) */
+struct smbios_type_7 {
+    struct smbios_structure_header header;
+    uint8_t socket_designation;
+    uint16_t cache_configuration;
+    uint16_t maximum_cache_size;
+    uint16_t installed_size;
+    uint16_t supported_sram_type;
+    uint16_t current_sram_type;
+    uint8_t cache_speed;
+    uint8_t error_correction_type;
+    uint8_t system_cache_type;
+    uint8_t associativity;
+    uint32_t maximum_cache_size2;
+    uint32_t installed_cache_size2;
+    /* contained elements follow */
+} QEMU_PACKED;
+
 /* SMBIOS type 8 - Port Connector Information */
 struct smbios_type_8 {
     struct smbios_structure_header header;
diff --git a/qemu-options.hx b/qemu-options.hx
index d94e2cbbae..21c05821d5 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2706,6 +2706,8 @@ DEF("smbios", HAS_ARG, QEMU_OPTION_smbios,
     "              [,asset=str][,part=str][,max-speed=%d][,current-speed=%d]\n"
     "              [,processor-family=%d][,processor-id=%d]\n"
     "                specify SMBIOS type 4 fields\n"
+    "-smbios type=7[,level=%d][,size=%d]\n"
+    "                specify SMBIOS type 7 fields\n"
     "-smbios type=8[,external_reference=str][,internal_reference=str][,connector_type=%d][,port_type=%d]\n"
     "                specify SMBIOS type 8 fields\n"
     "-smbios type=11[,value=str][,path=filename]\n"
-- 
2.42.0