target/s390x/cpu topology: handle STSI(15) and build the SYSIB

On interception of STSI(15.1.x) the System Information Block
(SYSIB) is built from the list of pre-ordered topology entries.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Co-developed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Message-ID: <20231016183925.2384704-5-nsg@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 56f9340914..09bff39fe4 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -570,6 +570,29 @@ typedef struct SysIB_322 {
 } SysIB_322;
 QEMU_BUILD_BUG_ON(sizeof(SysIB_322) != 4096);
 
+/*
+ * Topology Magnitude fields (MAG) indicates the maximum number of
+ * topology list entries (TLE) at the corresponding nesting level.
+ */
+#define S390_TOPOLOGY_MAG  6
+#define S390_TOPOLOGY_MAG6 0
+#define S390_TOPOLOGY_MAG5 1
+#define S390_TOPOLOGY_MAG4 2
+#define S390_TOPOLOGY_MAG3 3
+#define S390_TOPOLOGY_MAG2 4
+#define S390_TOPOLOGY_MAG1 5
+/* Configuration topology */
+typedef struct SysIB_151x {
+    uint8_t  reserved0[2];
+    uint16_t length;
+    uint8_t  mag[S390_TOPOLOGY_MAG];
+    uint8_t  reserved1;
+    uint8_t  mnest;
+    uint32_t reserved2;
+    char tle[];
+} SysIB_151x;
+QEMU_BUILD_BUG_ON(sizeof(SysIB_151x) != 16);
+
 typedef union SysIB {
     SysIB_111 sysib_111;
     SysIB_121 sysib_121;
@@ -577,9 +600,61 @@ typedef union SysIB {
     SysIB_221 sysib_221;
     SysIB_222 sysib_222;
     SysIB_322 sysib_322;
+    SysIB_151x sysib_151x;
 } SysIB;
 QEMU_BUILD_BUG_ON(sizeof(SysIB) != 4096);
 
+/*
+ * CPU Topology List provided by STSI with fc=15 provides a list
+ * of two different Topology List Entries (TLE) types to specify
+ * the topology hierarchy.
+ *
+ * - Container Topology List Entry
+ *   Defines a container to contain other Topology List Entries
+ *   of any type, nested containers or CPU.
+ * - CPU Topology List Entry
+ *   Specifies the CPUs position, type, entitlement and polarization
+ *   of the CPUs contained in the last container TLE.
+ *
+ * There can be theoretically up to five levels of containers, QEMU
+ * uses only three levels, the drawer's, book's and socket's level.
+ *
+ * A container with a nesting level (NL) greater than 1 can only
+ * contain another container of nesting level NL-1.
+ *
+ * A container of nesting level 1 (socket), contains as many CPU TLE
+ * as needed to describe the position and qualities of all CPUs inside
+ * the container.
+ * The qualities of a CPU are polarization, entitlement and type.
+ *
+ * The CPU TLE defines the position of the CPUs of identical qualities
+ * using a 64bits mask which first bit has its offset defined by
+ * the CPU address origin field of the CPU TLE like in:
+ * CPU address = origin * 64 + bit position within the mask
+ */
+/* Container type Topology List Entry */
+typedef struct SYSIBContainerListEntry {
+        uint8_t nl;
+        uint8_t reserved[6];
+        uint8_t id;
+} SYSIBContainerListEntry;
+QEMU_BUILD_BUG_ON(sizeof(SYSIBContainerListEntry) != 8);
+
+/* CPU type Topology List Entry */
+typedef struct SysIBCPUListEntry {
+        uint8_t nl;
+        uint8_t reserved0[3];
+#define SYSIB_TLE_POLARITY_MASK 0x03
+#define SYSIB_TLE_DEDICATED     0x04
+        uint8_t flags;
+        uint8_t type;
+        uint16_t origin;
+        uint64_t mask;
+} SysIBCPUListEntry;
+QEMU_BUILD_BUG_ON(sizeof(SysIBCPUListEntry) != 16);
+
+void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr, uint8_t ar, uintptr_t ra);
+
 /* MMU defines */
 #define ASCE_ORIGIN           (~0xfffULL) /* segment table origin             */
 #define ASCE_SUBSPACE         0x200       /* subspace group control           */