spapr, spapr_numa: handle vcpu ibm,associativity

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>
[dwg: Correct uint to int type, which can break windows builds]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 27 insertions, 0 deletions

diff --git a/hw/ppc/spapr_numa.c b/hw/ppc/spapr_numa.c
index f6b6fe6..523801f 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)
+{
+    int 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