[Qemu-devel] [PATCHv3 08/12] pseries: Consolidate construction of /rtas device tree node

[David Gibson <david@gibson.dropbear.id.au>]

For historical reasons construction of the /rtas node in the device
tree (amongst others) is split into several places.  In particular
it's split between spapr_create_fdt_skel(), spapr_build_fdt() and
spapr_rtas_device_tree_setup().

In fact, as well as adding the actual RTAS tokens to the device tree,
spapr_rtas_device_tree_setup() just adds the ibm,lrdr-capacity
property, which despite going in the /rtas node, doesn't have a lot to
do with RTAS.

This patch consolidates the code constructing /rtas together into a new
spapr_dt_rtas() function.  spapr_rtas_device_tree_setup() is renamed to
spapr_dt_rtas_tokens() and now only adds the token properties.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/ppc/spapr.c         | 130 +++++++++++++++++++++++++++----------------------
 hw/ppc/spapr_rtas.c    |  33 ++-----------
 include/hw/ppc/spapr.h |   3 +-
 3 files changed, 76 insertions(+), 90 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 8e71f1e..cf2002c 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -274,25 +274,8 @@ static void add_str(GString *s, const gchar *s1)
 static void *spapr_create_fdt_skel(sPAPRMachineState *spapr)
 {
     void *fdt;
-    GString *hypertas = g_string_sized_new(256);
-    GString *qemu_hypertas = g_string_sized_new(256);
-    uint32_t refpoints[] = {cpu_to_be32(0x4), cpu_to_be32(0x4)};
     char *buf;
 
-    add_str(hypertas, "hcall-pft");
-    add_str(hypertas, "hcall-term");
-    add_str(hypertas, "hcall-dabr");
-    add_str(hypertas, "hcall-interrupt");
-    add_str(hypertas, "hcall-tce");
-    add_str(hypertas, "hcall-vio");
-    add_str(hypertas, "hcall-splpar");
-    add_str(hypertas, "hcall-bulk");
-    add_str(hypertas, "hcall-set-mode");
-    add_str(hypertas, "hcall-sprg0");
-    add_str(hypertas, "hcall-copy");
-    add_str(hypertas, "hcall-debug");
-    add_str(qemu_hypertas, "hcall-memop1");
-
     fdt = g_malloc0(FDT_MAX_SIZE);
     _FDT((fdt_create(fdt, FDT_MAX_SIZE)));
 
@@ -333,41 +316,6 @@ static void *spapr_create_fdt_skel(sPAPRMachineState *spapr)
     _FDT((fdt_property_cell(fdt, "#address-cells", 0x2)));
     _FDT((fdt_property_cell(fdt, "#size-cells", 0x2)));
 
-    /* RTAS */
-    _FDT((fdt_begin_node(fdt, "rtas")));
-
-    if (!kvm_enabled() || kvmppc_spapr_use_multitce()) {
-        add_str(hypertas, "hcall-multi-tce");
-    }
-    _FDT((fdt_property(fdt, "ibm,hypertas-functions", hypertas->str,
-                       hypertas->len)));
-    g_string_free(hypertas, TRUE);
-    _FDT((fdt_property(fdt, "qemu,hypertas-functions", qemu_hypertas->str,
-                       qemu_hypertas->len)));
-    g_string_free(qemu_hypertas, TRUE);
-
-    _FDT((fdt_property(fdt, "ibm,associativity-reference-points",
-        refpoints, sizeof(refpoints))));
-
-    _FDT((fdt_property_cell(fdt, "rtas-error-log-max", RTAS_ERROR_LOG_MAX)));
-    _FDT((fdt_property_cell(fdt, "rtas-event-scan-rate",
-                            RTAS_EVENT_SCAN_RATE)));
-
-    if (msi_nonbroken) {
-        _FDT((fdt_property(fdt, "ibm,change-msix-capable", NULL, 0)));
-    }
-
-    /*
-     * According to PAPR, rtas ibm,os-term does not guarantee a return
-     * back to the guest cpu.
-     *
-     * While an additional ibm,extended-os-term property indicates that
-     * rtas call return will always occur. Set this property.
-     */
-    _FDT((fdt_property(fdt, "ibm,extended-os-term", NULL, 0)));
-
-    _FDT((fdt_end_node(fdt)));
-
     /* vdevice */
     _FDT((fdt_begin_node(fdt, "vdevice")));
 
@@ -840,6 +788,75 @@ int spapr_h_cas_compose_response(sPAPRMachineState *spapr,
     return 0;
 }
 
+static void spapr_dt_rtas(sPAPRMachineState *spapr, void *fdt)
+{
+    int rtas;
+    GString *hypertas = g_string_sized_new(256);
+    GString *qemu_hypertas = g_string_sized_new(256);
+    uint32_t refpoints[] = { cpu_to_be32(0x4), cpu_to_be32(0x4) };
+    uint64_t max_hotplug_addr = spapr->hotplug_memory.base +
+        memory_region_size(&spapr->hotplug_memory.mr);
+    uint32_t lrdr_capacity[] = {
+        cpu_to_be32(max_hotplug_addr >> 32),
+        cpu_to_be32(max_hotplug_addr & 0xffffffff),
+        0, cpu_to_be32(SPAPR_MEMORY_BLOCK_SIZE),
+        cpu_to_be32(max_cpus / smp_threads),
+    };
+
+    _FDT(rtas = fdt_add_subnode(fdt, 0, "rtas"));
+
+    /* hypertas */
+    add_str(hypertas, "hcall-pft");
+    add_str(hypertas, "hcall-term");
+    add_str(hypertas, "hcall-dabr");
+    add_str(hypertas, "hcall-interrupt");
+    add_str(hypertas, "hcall-tce");
+    add_str(hypertas, "hcall-vio");
+    add_str(hypertas, "hcall-splpar");
+    add_str(hypertas, "hcall-bulk");
+    add_str(hypertas, "hcall-set-mode");
+    add_str(hypertas, "hcall-sprg0");
+    add_str(hypertas, "hcall-copy");
+    add_str(hypertas, "hcall-debug");
+    add_str(qemu_hypertas, "hcall-memop1");
+
+    if (!kvm_enabled() || kvmppc_spapr_use_multitce()) {
+        add_str(hypertas, "hcall-multi-tce");
+    }
+    _FDT(fdt_setprop(fdt, rtas, "ibm,hypertas-functions",
+                     hypertas->str, hypertas->len));
+    g_string_free(hypertas, TRUE);
+    _FDT(fdt_setprop(fdt, rtas, "qemu,hypertas-functions",
+                     qemu_hypertas->str, qemu_hypertas->len));
+    g_string_free(qemu_hypertas, TRUE);
+
+    _FDT(fdt_setprop(fdt, rtas, "ibm,associativity-reference-points",
+                     refpoints, sizeof(refpoints)));
+
+    _FDT(fdt_setprop_cell(fdt, rtas, "rtas-error-log-max",
+                          RTAS_ERROR_LOG_MAX));
+    _FDT(fdt_setprop_cell(fdt, rtas, "rtas-event-scan-rate",
+                          RTAS_EVENT_SCAN_RATE));
+
+    if (msi_nonbroken) {
+        _FDT(fdt_setprop(fdt, rtas, "ibm,change-msix-capable", NULL, 0));
+    }
+
+    /*
+     * According to PAPR, rtas ibm,os-term does not guarantee a return
+     * back to the guest cpu.
+     *
+     * While an additional ibm,extended-os-term property indicates
+     * that rtas call return will always occur. Set this property.
+     */
+    _FDT(fdt_setprop(fdt, rtas, "ibm,extended-os-term", NULL, 0));
+
+    _FDT(fdt_setprop(fdt, rtas, "ibm,lrdr-capacity",
+                     lrdr_capacity, sizeof(lrdr_capacity)));
+
+    spapr_dt_rtas_tokens(fdt, rtas);
+}
+
 static void spapr_dt_chosen(sPAPRMachineState *spapr, void *fdt)
 {
     MachineState *machine = MACHINE(spapr);
@@ -949,12 +966,6 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
         }
     }
 
-    /* RTAS */
-    ret = spapr_rtas_device_tree_setup(fdt, rtas_addr, rtas_size);
-    if (ret < 0) {
-        error_report("Couldn't set up RTAS device tree properties");
-    }
-
     /* cpus */
     spapr_populate_cpus_dt_node(fdt, spapr);
 
@@ -972,6 +983,9 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
         }
     }
 
+    /* /rtas */
+    spapr_dt_rtas(spapr, fdt);
+
     /* /chosen */
     spapr_dt_chosen(spapr, fdt);
 
diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
index 54b4ad3..bb19944 100644
--- a/hw/ppc/spapr_rtas.c
+++ b/hw/ppc/spapr_rtas.c
@@ -46,6 +46,7 @@
 #include "hw/ppc/spapr_drc.h"
 #include "qemu/cutils.h"
 #include "trace.h"
+#include "hw/ppc/fdt.h"
 
 static sPAPRConfigureConnectorState *spapr_ccs_find(sPAPRMachineState *spapr,
                                                     uint32_t drc_index)
@@ -710,16 +711,9 @@ void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
     rtas_table[token].fn = fn;
 }
 
-int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
-                                 hwaddr rtas_size)
+void spapr_dt_rtas_tokens(void *fdt, int rtas)
 {
-    int ret;
     int i;
-    uint32_t lrdr_capacity[5];
-    MachineState *machine = MACHINE(qdev_get_machine());
-    sPAPRMachineState *spapr = SPAPR_MACHINE(machine);
-    uint64_t max_hotplug_addr = spapr->hotplug_memory.base +
-                                memory_region_size(&spapr->hotplug_memory.mr);
 
     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
         struct rtas_call *call = &rtas_table[i];
@@ -728,29 +722,8 @@ int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
             continue;
         }
 
-        ret = qemu_fdt_setprop_cell(fdt, "/rtas", call->name,
-                                    i + RTAS_TOKEN_BASE);
-        if (ret < 0) {
-            error_report("Couldn't add rtas token for %s: %s",
-                    call->name, fdt_strerror(ret));
-            return ret;
-        }
-
+        _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
     }
-
-    lrdr_capacity[0] = cpu_to_be32(max_hotplug_addr >> 32);
-    lrdr_capacity[1] = cpu_to_be32(max_hotplug_addr & 0xffffffff);
-    lrdr_capacity[2] = 0;
-    lrdr_capacity[3] = cpu_to_be32(SPAPR_MEMORY_BLOCK_SIZE);
-    lrdr_capacity[4] = cpu_to_be32(max_cpus/smp_threads);
-    ret = qemu_fdt_setprop(fdt, "/rtas", "ibm,lrdr-capacity", lrdr_capacity,
-                     sizeof(lrdr_capacity));
-    if (ret < 0) {
-        error_report("Couldn't add ibm,lrdr-capacity rtas property");
-        return ret;
-    }
-
-    return 0;
 }
 
 void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr)
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 847ae88..8b8bb97 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -530,8 +530,7 @@ void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn);
 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPRMachineState *sm,
                              uint32_t token, uint32_t nargs, target_ulong args,
                              uint32_t nret, target_ulong rets);
-int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
-                                 hwaddr rtas_size);
+void spapr_dt_rtas_tokens(void *fdt, int rtas);
 void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr);
 
 #define SPAPR_TCE_PAGE_SHIFT   12
-- 
2.7.4