diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/dlpar.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/dlpar.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c index c80e8ef0eb58..fe8d4b3c50cd 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 */ |