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-rw-r--r--arch/powerpc/platforms/pseries/dlpar.c548
1 files changed, 548 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
new file mode 100644
index 00000000000..37bce52526d
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -0,0 +1,548 @@
+/*
+ * Support for dynamic reconfiguration for PCI, Memory, and CPU
+ * Hotplug and Dynamic Logical Partitioning on RPA platforms.
+ *
+ * Copyright (C) 2009 Nathan Fontenot
+ * Copyright (C) 2009 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/spinlock.h>
+#include <linux/cpu.h>
+#include "offline_states.h"
+
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/uaccess.h>
+#include <asm/rtas.h>
+#include <asm/pSeries_reconfig.h>
+
+struct cc_workarea {
+ u32 drc_index;
+ u32 zero;
+ u32 name_offset;
+ u32 prop_length;
+ u32 prop_offset;
+};
+
+static void dlpar_free_cc_property(struct property *prop)
+{
+ kfree(prop->name);
+ kfree(prop->value);
+ kfree(prop);
+}
+
+static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
+{
+ struct property *prop;
+ char *name;
+ char *value;
+
+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+ if (!prop)
+ return NULL;
+
+ name = (char *)ccwa + ccwa->name_offset;
+ prop->name = kstrdup(name, GFP_KERNEL);
+
+ prop->length = ccwa->prop_length;
+ value = (char *)ccwa + ccwa->prop_offset;
+ prop->value = kzalloc(prop->length, GFP_KERNEL);
+ if (!prop->value) {
+ dlpar_free_cc_property(prop);
+ return NULL;
+ }
+
+ memcpy(prop->value, value, prop->length);
+ return prop;
+}
+
+static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
+{
+ struct device_node *dn;
+ char *name;
+
+ dn = kzalloc(sizeof(*dn), GFP_KERNEL);
+ if (!dn)
+ return NULL;
+
+ /* The configure connector reported name does not contain a
+ * preceeding '/', so we allocate a buffer large enough to
+ * prepend this to the full_name.
+ */
+ name = (char *)ccwa + ccwa->name_offset;
+ dn->full_name = kmalloc(strlen(name) + 2, GFP_KERNEL);
+ if (!dn->full_name) {
+ kfree(dn);
+ return NULL;
+ }
+
+ sprintf(dn->full_name, "/%s", name);
+ return dn;
+}
+
+static void dlpar_free_one_cc_node(struct device_node *dn)
+{
+ struct property *prop;
+
+ while (dn->properties) {
+ prop = dn->properties;
+ dn->properties = prop->next;
+ dlpar_free_cc_property(prop);
+ }
+
+ kfree(dn->full_name);
+ kfree(dn);
+}
+
+static void dlpar_free_cc_nodes(struct device_node *dn)
+{
+ if (dn->child)
+ dlpar_free_cc_nodes(dn->child);
+
+ if (dn->sibling)
+ dlpar_free_cc_nodes(dn->sibling);
+
+ dlpar_free_one_cc_node(dn);
+}
+
+#define NEXT_SIBLING 1
+#define NEXT_CHILD 2
+#define NEXT_PROPERTY 3
+#define PREV_PARENT 4
+#define MORE_MEMORY 5
+#define CALL_AGAIN -2
+#define ERR_CFG_USE -9003
+
+struct device_node *dlpar_configure_connector(u32 drc_index)
+{
+ struct device_node *dn;
+ struct device_node *first_dn = NULL;
+ struct device_node *last_dn = NULL;
+ struct property *property;
+ struct property *last_property = NULL;
+ struct cc_workarea *ccwa;
+ int cc_token;
+ int rc;
+
+ cc_token = rtas_token("ibm,configure-connector");
+ if (cc_token == RTAS_UNKNOWN_SERVICE)
+ return NULL;
+
+ spin_lock(&rtas_data_buf_lock);
+ ccwa = (struct cc_workarea *)&rtas_data_buf[0];
+ ccwa->drc_index = drc_index;
+ ccwa->zero = 0;
+
+ rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
+ while (rc) {
+ switch (rc) {
+ case NEXT_SIBLING:
+ dn = dlpar_parse_cc_node(ccwa);
+ if (!dn)
+ goto cc_error;
+
+ dn->parent = last_dn->parent;
+ last_dn->sibling = dn;
+ last_dn = dn;
+ break;
+
+ case NEXT_CHILD:
+ dn = dlpar_parse_cc_node(ccwa);
+ if (!dn)
+ goto cc_error;
+
+ if (!first_dn)
+ first_dn = dn;
+ else {
+ dn->parent = last_dn;
+ if (last_dn)
+ last_dn->child = dn;
+ }
+
+ last_dn = dn;
+ break;
+
+ case NEXT_PROPERTY:
+ property = dlpar_parse_cc_property(ccwa);
+ if (!property)
+ goto cc_error;
+
+ if (!last_dn->properties)
+ last_dn->properties = property;
+ else
+ last_property->next = property;
+
+ last_property = property;
+ break;
+
+ case PREV_PARENT:
+ last_dn = last_dn->parent;
+ break;
+
+ case CALL_AGAIN:
+ break;
+
+ case MORE_MEMORY:
+ case ERR_CFG_USE:
+ default:
+ printk(KERN_ERR "Unexpected Error (%d) "
+ "returned from configure-connector\n", rc);
+ goto cc_error;
+ }
+
+ rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
+ }
+
+ spin_unlock(&rtas_data_buf_lock);
+ return first_dn;
+
+cc_error:
+ if (first_dn)
+ dlpar_free_cc_nodes(first_dn);
+ spin_unlock(&rtas_data_buf_lock);
+ return NULL;
+}
+
+static struct device_node *derive_parent(const char *path)
+{
+ struct device_node *parent;
+ char *last_slash;
+
+ last_slash = strrchr(path, '/');
+ if (last_slash == path) {
+ parent = of_find_node_by_path("/");
+ } else {
+ char *parent_path;
+ int parent_path_len = last_slash - path + 1;
+ parent_path = kmalloc(parent_path_len, GFP_KERNEL);
+ if (!parent_path)
+ return NULL;
+
+ strlcpy(parent_path, path, parent_path_len);
+ parent = of_find_node_by_path(parent_path);
+ kfree(parent_path);
+ }
+
+ return parent;
+}
+
+int dlpar_attach_node(struct device_node *dn)
+{
+#ifdef CONFIG_PROC_DEVICETREE
+ struct proc_dir_entry *ent;
+#endif
+ int rc;
+
+ of_node_set_flag(dn, OF_DYNAMIC);
+ kref_init(&dn->kref);
+ dn->parent = derive_parent(dn->full_name);
+ if (!dn->parent)
+ return -ENOMEM;
+
+ rc = blocking_notifier_call_chain(&pSeries_reconfig_chain,
+ PSERIES_RECONFIG_ADD, dn);
+ if (rc == NOTIFY_BAD) {
+ printk(KERN_ERR "Failed to add device node %s\n",
+ dn->full_name);
+ return -ENOMEM; /* For now, safe to assume kmalloc failure */
+ }
+
+ of_attach_node(dn);
+
+#ifdef CONFIG_PROC_DEVICETREE
+ ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde);
+ if (ent)
+ proc_device_tree_add_node(dn, ent);
+#endif
+
+ of_node_put(dn->parent);
+ return 0;
+}
+
+int dlpar_detach_node(struct device_node *dn)
+{
+#ifdef CONFIG_PROC_DEVICETREE
+ struct device_node *parent = dn->parent;
+ struct property *prop = dn->properties;
+
+ while (prop) {
+ remove_proc_entry(prop->name, dn->pde);
+ prop = prop->next;
+ }
+
+ if (dn->pde)
+ remove_proc_entry(dn->pde->name, parent->pde);
+#endif
+
+ blocking_notifier_call_chain(&pSeries_reconfig_chain,
+ PSERIES_RECONFIG_REMOVE, dn);
+ of_detach_node(dn);
+ of_node_put(dn); /* Must decrement the refcount */
+
+ return 0;
+}
+
+#define DR_ENTITY_SENSE 9003
+#define DR_ENTITY_PRESENT 1
+#define DR_ENTITY_UNUSABLE 2
+#define ALLOCATION_STATE 9003
+#define ALLOC_UNUSABLE 0
+#define ALLOC_USABLE 1
+#define ISOLATION_STATE 9001
+#define ISOLATE 0
+#define UNISOLATE 1
+
+int dlpar_acquire_drc(u32 drc_index)
+{
+ int dr_status, rc;
+
+ rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
+ DR_ENTITY_SENSE, drc_index);
+ if (rc || dr_status != DR_ENTITY_UNUSABLE)
+ return -1;
+
+ rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
+ if (rc)
+ return rc;
+
+ rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
+ if (rc) {
+ rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
+ return rc;
+ }
+
+ return 0;
+}
+
+int dlpar_release_drc(u32 drc_index)
+{
+ int dr_status, rc;
+
+ rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
+ DR_ENTITY_SENSE, drc_index);
+ if (rc || dr_status != DR_ENTITY_PRESENT)
+ return -1;
+
+ rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
+ if (rc)
+ return rc;
+
+ rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
+ if (rc) {
+ rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
+ return rc;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+
+static int dlpar_online_cpu(struct device_node *dn)
+{
+ int rc = 0;
+ unsigned int cpu;
+ int len, nthreads, i;
+ const u32 *intserv;
+
+ intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
+ if (!intserv)
+ return -EINVAL;
+
+ nthreads = len / sizeof(u32);
+
+ cpu_maps_update_begin();
+ for (i = 0; i < nthreads; i++) {
+ for_each_present_cpu(cpu) {
+ if (get_hard_smp_processor_id(cpu) != intserv[i])
+ continue;
+ BUG_ON(get_cpu_current_state(cpu)
+ != CPU_STATE_OFFLINE);
+ cpu_maps_update_done();
+ rc = cpu_up(cpu);
+ if (rc)
+ goto out;
+ cpu_maps_update_begin();
+
+ break;
+ }
+ if (cpu == num_possible_cpus())
+ printk(KERN_WARNING "Could not find cpu to online "
+ "with physical id 0x%x\n", intserv[i]);
+ }
+ cpu_maps_update_done();
+
+out:
+ return rc;
+
+}
+
+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;
+
+ cpu_hotplug_driver_lock();
+ rc = strict_strtoul(buf, 0, &drc_index);
+ if (rc) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ dn = dlpar_configure_connector(drc_index);
+ if (!dn) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ /* 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);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ 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);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = dlpar_attach_node(dn);
+ if (rc) {
+ dlpar_release_drc(drc_index);
+ dlpar_free_cc_nodes(dn);
+ }
+
+ rc = dlpar_online_cpu(dn);
+out:
+ cpu_hotplug_driver_unlock();
+
+ return rc ? rc : count;
+}
+
+static int dlpar_offline_cpu(struct device_node *dn)
+{
+ int rc = 0;
+ unsigned int cpu;
+ int len, nthreads, i;
+ const u32 *intserv;
+
+ intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
+ if (!intserv)
+ return -EINVAL;
+
+ nthreads = len / sizeof(u32);
+
+ cpu_maps_update_begin();
+ for (i = 0; i < nthreads; i++) {
+ for_each_present_cpu(cpu) {
+ if (get_hard_smp_processor_id(cpu) != intserv[i])
+ continue;
+
+ if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
+ break;
+
+ if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
+ cpu_maps_update_done();
+ rc = cpu_down(cpu);
+ if (rc)
+ goto out;
+ cpu_maps_update_begin();
+ break;
+
+ }
+
+ /*
+ * The cpu is in CPU_STATE_INACTIVE.
+ * Upgrade it's state to CPU_STATE_OFFLINE.
+ */
+ set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
+ BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
+ != H_SUCCESS);
+ __cpu_die(cpu);
+ break;
+ }
+ if (cpu == num_possible_cpus())
+ printk(KERN_WARNING "Could not find cpu to offline "
+ "with physical id 0x%x\n", intserv[i]);
+ }
+ cpu_maps_update_done();
+
+out:
+ return rc;
+
+}
+
+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;
+ }
+
+ cpu_hotplug_driver_lock();
+ rc = dlpar_offline_cpu(dn);
+ if (rc) {
+ of_node_put(dn);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = dlpar_release_drc(*drc_index);
+ if (rc) {
+ of_node_put(dn);
+ goto out;
+ }
+
+ rc = dlpar_detach_node(dn);
+ if (rc) {
+ dlpar_acquire_drc(*drc_index);
+ goto out;
+ }
+
+ of_node_put(dn);
+out:
+ cpu_hotplug_driver_unlock();
+ return rc ? rc : 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 */