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powerpc/pseries: Add kernel based CPU DLPAR handling

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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>
This commit is contained in:
Nathan Fontenot 2009-11-24 21:13:32 +00:00 committed by Benjamin Herrenschmidt
parent 12633e803a
commit 1a8061c46c
1 changed files with 88 additions and 0 deletions
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88
arch/powerpc/platforms/pseries/dlpar.c
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@ -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 */