[PULL 28/30] spapr, spapr_numa: handle vcpu ibm,associativity

[David Gibson]

From: Daniel Henrique Barboza <danielhb413@gmail.com>

Vcpus have an additional paramenter to be appended, vcpu_id. This
also changes the size of the of property itself, which is being
represented in index 0 of numa_assoc_array[cpu->node_id],
and defaults to MAX_DISTANCE_REF_POINTS for all cases but
vcpus.

All this logic makes more sense in spapr_numa.c, where we handle
everything NUMA and associativity. A new helper spapr_numa_fixup_cpu_dt()
was added, and spapr.c uses it the same way as it was using the former
spapr_fixup_cpu_numa_dt().

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20200903220639.563090-3-danielhb413@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c              | 17 +----------------
 hw/ppc/spapr_numa.c         | 27 +++++++++++++++++++++++++++
 include/hw/ppc/spapr_numa.h |  2 ++
 3 files changed, 30 insertions(+), 16 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 1ad6f59863..badfa86319 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -202,21 +202,6 @@ static int spapr_fixup_cpu_smt_dt(void *fdt, int offset, 
PowerPCCPU *cpu,
     return ret;
 }
 
-static int spapr_fixup_cpu_numa_dt(void *fdt, int offset, PowerPCCPU *cpu)
-{
-    int index = spapr_get_vcpu_id(cpu);
-    uint32_t associativity[] = {cpu_to_be32(0x5),
-                                cpu_to_be32(0x0),
-                                cpu_to_be32(0x0),
-                                cpu_to_be32(0x0),
-                                cpu_to_be32(cpu->node_id),
-                                cpu_to_be32(index)};
-
-    /* Advertise NUMA via ibm,associativity */
-    return fdt_setprop(fdt, offset, "ibm,associativity", associativity,
-                          sizeof(associativity));
-}
-
 static void spapr_dt_pa_features(SpaprMachineState *spapr,
                                  PowerPCCPU *cpu,
                                  void *fdt, int offset)
@@ -785,7 +770,7 @@ static void spapr_dt_cpu(CPUState *cs, void *fdt, int 
offset,
                       pft_size_prop, sizeof(pft_size_prop))));
 
     if (ms->numa_state->num_nodes > 1) {
-        _FDT(spapr_fixup_cpu_numa_dt(fdt, offset, cpu));
+        _FDT(spapr_numa_fixup_cpu_dt(spapr, fdt, offset, cpu));
     }
 
     _FDT(spapr_fixup_cpu_smt_dt(fdt, offset, cpu, compat_smt));
diff --git a/hw/ppc/spapr_numa.c b/hw/ppc/spapr_numa.c
index f6b6fe648f..1a1ec8bcff 100644
--- a/hw/ppc/spapr_numa.c
+++ b/hw/ppc/spapr_numa.c
@@ -45,6 +45,33 @@ void spapr_numa_write_associativity_dt(SpaprMachineState 
*spapr, void *fdt,
                       sizeof(spapr->numa_assoc_array[nodeid]))));
 }
 
+int spapr_numa_fixup_cpu_dt(SpaprMachineState *spapr, void *fdt,
+                            int offset, PowerPCCPU *cpu)
+{
+    uint vcpu_assoc_size = NUMA_ASSOC_SIZE + 1;
+    uint32_t vcpu_assoc[vcpu_assoc_size];
+    int index = spapr_get_vcpu_id(cpu);
+    int i;
+
+    /*
+     * VCPUs have an extra 'cpu_id' value in ibm,associativity
+     * compared to other resources. Increment the size at index
+     * 0, copy all associativity domains already set, then put
+     * cpu_id last.
+     */
+    vcpu_assoc[0] = cpu_to_be32(MAX_DISTANCE_REF_POINTS + 1);
+
+    for (i = 1; i <= MAX_DISTANCE_REF_POINTS; i++) {
+        vcpu_assoc[i] = spapr->numa_assoc_array[cpu->node_id][i];
+    }
+
+    vcpu_assoc[vcpu_assoc_size - 1] = cpu_to_be32(index);
+
+    /* Advertise NUMA via ibm,associativity */
+    return fdt_setprop(fdt, offset, "ibm,associativity",
+                       vcpu_assoc, sizeof(vcpu_assoc));
+}
+
 /*
  * Helper that writes ibm,associativity-reference-points and
  * max-associativity-domains in the RTAS pointed by @rtas
diff --git a/include/hw/ppc/spapr_numa.h b/include/hw/ppc/spapr_numa.h
index a2a4df55f7..43c6a16fe3 100644
--- a/include/hw/ppc/spapr_numa.h
+++ b/include/hw/ppc/spapr_numa.h
@@ -27,5 +27,7 @@ void spapr_numa_associativity_init(SpaprMachineState *spapr,
 void spapr_numa_write_rtas_dt(SpaprMachineState *spapr, void *fdt, int rtas);
 void spapr_numa_write_associativity_dt(SpaprMachineState *spapr, void *fdt,
                                        int offset, int nodeid);
+int spapr_numa_fixup_cpu_dt(SpaprMachineState *spapr, void *fdt,
+                            int offset, PowerPCCPU *cpu);
 
 #endif /* HW_SPAPR_NUMA_H */
-- 
2.26.2