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authorNathan Fontenot <nfont@austin.ibm.com>2009-11-24 21:13:32 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-12-09 17:09:34 +1100
commit1a8061c46c46c960f715c597b9d279ea2ba42bd9 (patch)
tree1703769dcccf9c367e73d5ccaf851ac4ec53a8b1
parent12633e803a2a556f6469e0933d08233d0844a2d9 (diff)
powerpc/pseries: Add kernel based CPU DLPAR handling
This patch adds the specific routines to probe and release (add and remove) cpu resource for the powerpc pseries platform and registers these handlers with the ppc_md callout structure. Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/platforms/pseries/dlpar.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index c80e8ef0eb5..fe8d4b3c50c 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -341,4 +341,92 @@ int dlpar_release_drc(u32 drc_index)
return 0;
}
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
+{
+ struct device_node *dn;
+ unsigned long drc_index;
+ char *cpu_name;
+ int rc;
+
+ rc = strict_strtoul(buf, 0, &drc_index);
+ if (rc)
+ return -EINVAL;
+
+ dn = dlpar_configure_connector(drc_index);
+ if (!dn)
+ return -EINVAL;
+
+ /* configure-connector reports cpus as living in the base
+ * directory of the device tree. CPUs actually live in the
+ * cpus directory so we need to fixup the full_name.
+ */
+ cpu_name = kzalloc(strlen(dn->full_name) + strlen("/cpus") + 1,
+ GFP_KERNEL);
+ if (!cpu_name) {
+ dlpar_free_cc_nodes(dn);
+ return -ENOMEM;
+ }
+
+ sprintf(cpu_name, "/cpus%s", dn->full_name);
+ kfree(dn->full_name);
+ dn->full_name = cpu_name;
+
+ 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);
+ dlpar_free_cc_nodes(dn);
+ }
+
+ return rc ? rc : count;
+}
+
+static ssize_t dlpar_cpu_release(const char *buf, size_t count)
+{
+ struct device_node *dn;
+ const u32 *drc_index;
+ int rc;
+
+ dn = of_find_node_by_path(buf);
+ if (!dn)
+ return -EINVAL;
+
+ drc_index = of_get_property(dn, "ibm,my-drc-index", NULL);
+ if (!drc_index) {
+ of_node_put(dn);
+ return -EINVAL;
+ }
+
+ rc = dlpar_release_drc(*drc_index);
+ if (rc) {
+ of_node_put(dn);
+ return -EINVAL;
+ }
+
+ rc = dlpar_detach_node(dn);
+ if (rc) {
+ dlpar_acquire_drc(*drc_index);
+ return rc;
+ }
+
+ of_node_put(dn);
+ return count;
+}
+
+static int __init pseries_dlpar_init(void)
+{
+ ppc_md.cpu_probe = dlpar_cpu_probe;
+ ppc_md.cpu_release = dlpar_cpu_release;
+
+ return 0;
+}
+machine_device_initcall(pseries, pseries_dlpar_init);
+
+#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */