pc: acpi: cpuhp: move PRSC() method into SSDT

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/acpi/cpu_hotplug_acpi_table.c

@@ -26,6 +26,8 @@ void build_cpu_hotplug_aml(Aml *ctx)
     Aml *cpu_on = aml_local(0);
     Aml *madt = aml_local(1);
     Aml *cpus_map = aml_name(CPU_ON_BITMAP);
+    Aml *zero = aml_int(0);
+    Aml *one = aml_int(1);
 
     /*
      * _MAT method - creates an madt apic buffer
@@ -60,7 +62,7 @@ void build_cpu_hotplug_aml(Aml *ctx)
     aml_append(method, if_ctx);
     else_ctx = aml_else();
     {
-        aml_append(else_ctx, aml_return(aml_int(0x0)));
+        aml_append(else_ctx, aml_return(zero));
     }
     aml_append(method, else_ctx);
     aml_append(sb_scope, method);
@@ -69,5 +71,65 @@ void build_cpu_hotplug_aml(Aml *ctx)
     aml_append(method, aml_sleep(200));
     aml_append(sb_scope, method);
 
+    method = aml_method(stringify(CPU_SCAN_METHOD), 0, AML_NOTSERIALIZED);
+    {
+        Aml *while_ctx, *if_ctx2, *else_ctx2;
+        Aml *bus_check_evt = aml_int(1);
+        Aml *remove_evt = aml_int(3);
+        Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */
+        Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */
+        Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */
+        Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */
+        Aml *status = aml_local(3); /* Local3 = active state for cpu */
+
+        aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map));
+        aml_append(method, aml_store(zero, byte));
+        aml_append(method, aml_store(zero, idx));
+
+        /* While (idx < SizeOf(CPON)) */
+        while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map)));
+        aml_append(while_ctx,
+            aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on));
+
+        if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL));
+        {
+            /* Shift down previously read bitmap byte */
+            aml_append(if_ctx, aml_shiftright(byte, one, byte));
+        }
+        aml_append(while_ctx, if_ctx);
+
+        else_ctx = aml_else();
+        {
+            /* Read next byte from cpu bitmap */
+            aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map,
+                       aml_shiftright(idx, aml_int(3), NULL))), byte));
+        }
+        aml_append(while_ctx, else_ctx);
+
+        aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status));
+        if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status)));
+        {
+            /* State change - update CPON with new state */
+            aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx)));
+            if_ctx2 = aml_if(aml_equal(status, one));
+            {
+                aml_append(if_ctx2,
+                    aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt));
+            }
+            aml_append(if_ctx, if_ctx2);
+            else_ctx2 = aml_else();
+            {
+                aml_append(else_ctx2,
+                    aml_call2(AML_NOTIFY_METHOD, idx, remove_evt));
+            }
+        }
+        aml_append(if_ctx, else_ctx2);
+        aml_append(while_ctx, if_ctx);
+
+        aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */
+        aml_append(method, while_ctx);
+    }
+    aml_append(sb_scope, method);
+
     aml_append(ctx, sb_scope);
 }

hw/i386/acpi-build.c

@@ -1340,7 +1340,7 @@ build_ssdt(GArray *table_data, GArray *linker,
          *   Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00, Arg1)} ...}
          */
         /* Arg0 = Processor ID = APIC ID */
-        method = aml_method("NTFY", 2, AML_NOTSERIALIZED);
+        method = aml_method(AML_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
         for (i = 0; i < acpi_cpus; i++) {
             ifctx = aml_if(aml_equal(aml_arg(0), aml_int(i)));
             aml_append(ifctx,

hw/i386/acpi-dsdt-cpu-hotplug.dsl

@@ -19,42 +19,5 @@
 
 Scope(\_SB) {
     /* Objects filled in by run-time generated SSDT */
-    External(NTFY, MethodObj)
-    External(CPON, PkgObj)
-    External(PRS, FieldUnitObj)
-
-    /* Methods called by run-time generated SSDT Processor objects */
-    Method(PRSC, 0) {
-        // Local5 = active cpu bitmap
-        Store(PRS, Local5)
-        // Local2 = last read byte from bitmap
-        Store(Zero, Local2)
-        // Local0 = Processor ID / APIC ID iterator
-        Store(Zero, Local0)
-        While (LLess(Local0, SizeOf(CPON))) {
-            // Local1 = CPON flag for this cpu
-            Store(DerefOf(Index(CPON, Local0)), Local1)
-            If (And(Local0, 0x07)) {
-                // Shift down previously read bitmap byte
-                ShiftRight(Local2, 1, Local2)
-            } Else {
-                // Read next byte from cpu bitmap
-                Store(DerefOf(Index(Local5, ShiftRight(Local0, 3))), Local2)
-            }
-            // Local3 = active state for this cpu
-            Store(And(Local2, 1), Local3)
-
-            If (LNotEqual(Local1, Local3)) {
-                // State change - update CPON with new state
-                Store(Local3, Index(CPON, Local0))
-                // Do CPU notify
-                If (LEqual(Local3, 1)) {
-                    NTFY(Local0, 1)
-                } Else {
-                    NTFY(Local0, 3)
-                }
-            }
-            Increment(Local0)
-        }
-    }
+    External(CPU_SCAN_METHOD, MethodObj)
 }

hw/i386/acpi-dsdt.dsl

@@ -268,7 +268,7 @@ DefinitionBlock (
         }
         Method(_E02) {
             // CPU hotplug event
-            \_SB.PRSC()
+            \_SB.CPU_SCAN_METHOD()
         }
         Method(_L04) {
         }

hw/i386/q35-acpi-dsdt.dsl

@@ -401,7 +401,7 @@ DefinitionBlock (
         }
         Method(_E02) {
             // CPU hotplug event
-            \_SB.PRSC()
+            \_SB.CPU_SCAN_METHOD()
         }
         Method(_L04) {
         }

include/hw/acpi/aml-build.h

@@ -16,6 +16,8 @@
 #define ACPI_BUILD_RSDP_FILE "etc/acpi/rsdp"
 #define ACPI_BUILD_TPMLOG_FILE "etc/tpm/log"
 
+#define AML_NOTIFY_METHOD "NTFY"
+
 typedef enum {
     AML_NO_OPCODE = 0,/* has only data */
     AML_OPCODE,       /* has opcode optionally followed by data */

include/hw/acpi/cpu_hotplug.h

@@ -31,6 +31,7 @@ void acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
 #define CPU_MAT_METHOD "CPMA"
 #define CPU_ON_BITMAP "CPON"
 #define CPU_STATUS_METHOD "CPST"
+#define CPU_STATUS_MAP "PRS"
 
 void build_cpu_hotplug_aml(Aml *ctx);
 #endif

include/hw/acpi/pc-hotplug.h

@@ -28,6 +28,7 @@
 #define ICH9_CPU_HOTPLUG_IO_BASE 0x0CD8
 #define PIIX4_CPU_HOTPLUG_IO_BASE 0xaf00
 #define CPU_HOTPLUG_RESOURCE_DEVICE PRES
+#define CPU_SCAN_METHOD PRSC
 
 #define ACPI_MEMORY_HOTPLUG_IO_LEN 24
 #define ACPI_MEMORY_HOTPLUG_BASE 0x0a00