powerpc/pseries: Correct cpu affinity for dlpar added cpus

The incorrect ordering of operations during cpu dlpar add results in invalid
affinity for the cpu being added. The ibm,associativity property in the
device tree is populated with all zeroes for the added cpu which results in
invalid affinity mappings and all cpus appear to belong to node 0.

This occurs because rtas configure-connector is called prior to making the
rtas set-indicator calls. Phyp does not assign affinity information
for a cpu until the rtas set-indicator calls are made to set the isolation
and allocation state.

Correct the order of operations to make the rtas set-indicator
calls (done in dlpar_acquire_drc) before calling rtas configure-connector.

Fixes: 1a8061c46c46 ("powerpc/pseries: Add kernel based CPU DLPAR handling")
Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index b4b11096ea8b74c3695c46deff77c25d2409f8f4..019d34aaf054bc843d6a2d5ac531e9207e6c42ab 100644 (file)
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -412,6 +412,10 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
        if (rc)
                return -EINVAL;
 
+       rc = dlpar_acquire_drc(drc_index);
+       if (rc)
+               return -EINVAL;
+
        parent = of_find_node_by_path("/cpus");
        if (!parent)
                return -ENODEV;
@@ -422,12 +426,6 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
 
        of_node_put(parent);
 
-       rc = dlpar_acquire_drc(drc_index);
-       if (rc) {
-               dlpar_free_cc_nodes(dn);
-               return -EINVAL;
-       }
-
        rc = dlpar_attach_node(dn);
        if (rc) {
                dlpar_release_drc(drc_index);