[Qemu-devel] [PATCH v3 2/2] spapr: Use DeviceClass::fw_name for device tree CPU node

["Andreas Färber" <afaerber@suse.de>]

Instead of relying on cpu_model, obtain the device tree node label
per CPU. Use DeviceClass::fw_name as source.

Whenever DeviceClass::fw_name is unknown, default to "PowerPC,UNKNOWN".

As a consequence, spapr_fixup_cpu_dt() can operate on each CPU's fw_name,
obsoleting sPAPREnvironment::cpu_model, and spapr_create_fdt_skel() can
drop its cpu_model argument.

Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 hw/ppc/spapr.c              | 26 ++++++--------------------
 include/hw/ppc/spapr.h      |  1 -
 target-ppc/translate_init.c |  2 ++
 3 files changed, 8 insertions(+), 21 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 004184d..6c00a8f 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -185,9 +185,8 @@ static int spapr_fixup_cpu_dt(void *fdt, sPAPREnvironment *spapr)
     int smt = kvmppc_smt_threads();
     uint32_t pft_size_prop[] = {0, cpu_to_be32(spapr->htab_shift)};
 
-    assert(spapr->cpu_model);
-
     CPU_FOREACH(cpu) {
+        DeviceClass *dc = DEVICE_GET_CLASS(cpu);
         uint32_t associativity[] = {cpu_to_be32(0x5),
                                     cpu_to_be32(0x0),
                                     cpu_to_be32(0x0),
@@ -199,7 +198,7 @@ static int spapr_fixup_cpu_dt(void *fdt, sPAPREnvironment *spapr)
             continue;
         }
 
-        snprintf(cpu_model, 32, "/cpus/%s@%x", spapr->cpu_model,
+        snprintf(cpu_model, 32, "/cpus/%s@%x", dc->fw_name,
                  cpu->cpu_index);
 
         offset = fdt_path_offset(fdt, cpu_model);
@@ -269,8 +268,7 @@ static size_t create_page_sizes_prop(CPUPPCState *env, uint32_t *prop,
     } while (0)
 
 
-static void *spapr_create_fdt_skel(const char *cpu_model,
-                                   hwaddr initrd_base,
+static void *spapr_create_fdt_skel(hwaddr initrd_base,
                                    hwaddr initrd_size,
                                    hwaddr kernel_size,
                                    const char *boot_device,
@@ -286,7 +284,6 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
     char qemu_hypertas_prop[] = "hcall-memop1";
     uint32_t refpoints[] = {cpu_to_be32(0x4), cpu_to_be32(0x4)};
     uint32_t interrupt_server_ranges_prop[] = {0, cpu_to_be32(smp_cpus)};
-    char *modelname;
     int i, smt = kvmppc_smt_threads();
     unsigned char vec5[] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x80};
 
@@ -342,18 +339,10 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
     _FDT((fdt_property_cell(fdt, "#address-cells", 0x1)));
     _FDT((fdt_property_cell(fdt, "#size-cells", 0x0)));
 
-    modelname = g_strdup(cpu_model);
-
-    for (i = 0; i < strlen(modelname); i++) {
-        modelname[i] = toupper(modelname[i]);
-    }
-
-    /* This is needed during FDT finalization */
-    spapr->cpu_model = g_strdup(modelname);
-
     CPU_FOREACH(cs) {
         PowerPCCPU *cpu = POWERPC_CPU(cs);
         CPUPPCState *env = &cpu->env;
+        DeviceClass *dc = DEVICE_GET_CLASS(cs);
         PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cs);
         int index = cs->cpu_index;
         uint32_t servers_prop[smp_threads];
@@ -370,7 +359,7 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
             continue;
         }
 
-        nodename = g_strdup_printf("%s@%x", modelname, index);
+        nodename = g_strdup_printf("%s@%x", dc->fw_name, index);
 
         _FDT((fdt_begin_node(fdt, nodename)));
 
@@ -450,8 +439,6 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
         _FDT((fdt_end_node(fdt)));
     }
 
-    g_free(modelname);
-
     _FDT((fdt_end_node(fdt)));
 
     /* RTAS */
@@ -1329,8 +1316,7 @@ static void ppc_spapr_init(QEMUMachineInitArgs *args)
                          &savevm_htab_handlers, spapr);
 
     /* Prepare the device tree */
-    spapr->fdt_skel = spapr_create_fdt_skel(cpu_model,
-                                            initrd_base, initrd_size,
+    spapr->fdt_skel = spapr_create_fdt_skel(initrd_base, initrd_size,
                                             kernel_size,
                                             boot_device, kernel_cmdline,
                                             spapr->epow_irq);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index e37b419..74361f3 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -29,7 +29,6 @@ typedef struct sPAPREnvironment {
     target_ulong entry_point;
     uint32_t next_irq;
     uint64_t rtc_offset;
-    char *cpu_model;
     bool has_graphics;
 
     uint32_t epow_irq;
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 5f6a836..32f6cdd 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -8578,6 +8578,8 @@ static void ppc_cpu_class_init(ObjectClass *oc, void *data)
 #else
     cc->gdb_core_xml_file = "power-core.xml";
 #endif
+
+    dc->fw_name = "PowerPC,UNKNOWN";
 }
 
 static const TypeInfo ppc_cpu_type_info = {
-- 
1.8.1.4