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-rw-r--r--arch/powerpc/platforms/pseries/dlpar.c586
1 files changed, 586 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
new file mode 100644
index 000000000..f6b7749d6
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -0,0 +1,586 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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
+ */
+
+#define pr_fmt(fmt) "dlpar: " fmt
+
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+#include <linux/spinlock.h>
+#include <linux/cpu.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+#include "of_helpers.h"
+#include "pseries.h"
+
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <linux/uaccess.h>
+#include <asm/rtas.h>
+
+static struct workqueue_struct *pseries_hp_wq;
+
+struct pseries_hp_work {
+ struct work_struct work;
+ struct pseries_hp_errorlog *errlog;
+};
+
+struct cc_workarea {
+ __be32 drc_index;
+ __be32 zero;
+ __be32 name_offset;
+ __be32 prop_length;
+ __be32 prop_offset;
+};
+
+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 + be32_to_cpu(ccwa->name_offset);
+ prop->name = kstrdup(name, GFP_KERNEL);
+ if (!prop->name) {
+ dlpar_free_cc_property(prop);
+ return NULL;
+ }
+
+ prop->length = be32_to_cpu(ccwa->prop_length);
+ value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
+ prop->value = kmemdup(value, prop->length, GFP_KERNEL);
+ if (!prop->value) {
+ dlpar_free_cc_property(prop);
+ return NULL;
+ }
+
+ return prop;
+}
+
+static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
+{
+ struct device_node *dn;
+ const char *name;
+
+ dn = kzalloc(sizeof(*dn), GFP_KERNEL);
+ if (!dn)
+ return NULL;
+
+ name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
+ dn->full_name = kstrdup(name, GFP_KERNEL);
+ if (!dn->full_name) {
+ kfree(dn);
+ return NULL;
+ }
+
+ of_node_set_flag(dn, OF_DYNAMIC);
+ of_node_init(dn);
+
+ 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);
+}
+
+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 COMPLETE 0
+#define NEXT_SIBLING 1
+#define NEXT_CHILD 2
+#define NEXT_PROPERTY 3
+#define PREV_PARENT 4
+#define MORE_MEMORY 5
+#define ERR_CFG_USE -9003
+
+struct device_node *dlpar_configure_connector(__be32 drc_index,
+ struct device_node *parent)
+{
+ 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;
+ char *data_buf;
+ int cc_token;
+ int rc = -1;
+
+ cc_token = rtas_token("ibm,configure-connector");
+ if (cc_token == RTAS_UNKNOWN_SERVICE)
+ return NULL;
+
+ data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
+ if (!data_buf)
+ return NULL;
+
+ ccwa = (struct cc_workarea *)&data_buf[0];
+ ccwa->drc_index = drc_index;
+ ccwa->zero = 0;
+
+ do {
+ /* Since we release the rtas_data_buf lock between configure
+ * connector calls we want to re-populate the rtas_data_buffer
+ * with the contents of the previous call.
+ */
+ spin_lock(&rtas_data_buf_lock);
+
+ memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
+ rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
+ memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
+
+ spin_unlock(&rtas_data_buf_lock);
+
+ if (rtas_busy_delay(rc))
+ continue;
+
+ switch (rc) {
+ case COMPLETE:
+ break;
+
+ 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) {
+ dn->parent = parent;
+ 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 MORE_MEMORY:
+ case ERR_CFG_USE:
+ default:
+ printk(KERN_ERR "Unexpected Error (%d) "
+ "returned from configure-connector\n", rc);
+ goto cc_error;
+ }
+ } while (rc);
+
+cc_error:
+ kfree(data_buf);
+
+ if (rc) {
+ if (first_dn)
+ dlpar_free_cc_nodes(first_dn);
+
+ return NULL;
+ }
+
+ return first_dn;
+}
+
+int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
+{
+ int rc;
+
+ dn->parent = parent;
+
+ rc = of_attach_node(dn);
+ if (rc) {
+ printk(KERN_ERR "Failed to add device node %pOF\n", dn);
+ return rc;
+ }
+
+ return 0;
+}
+
+int dlpar_detach_node(struct device_node *dn)
+{
+ struct device_node *child;
+ int rc;
+
+ child = of_get_next_child(dn, NULL);
+ while (child) {
+ dlpar_detach_node(child);
+ child = of_get_next_child(dn, child);
+ }
+
+ rc = of_detach_node(dn);
+ if (rc)
+ return rc;
+
+ of_node_put(dn);
+
+ 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;
+}
+
+int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
+{
+ int rc;
+
+ /* pseries error logs are in BE format, convert to cpu type */
+ switch (hp_elog->id_type) {
+ case PSERIES_HP_ELOG_ID_DRC_COUNT:
+ hp_elog->_drc_u.drc_count =
+ be32_to_cpu(hp_elog->_drc_u.drc_count);
+ break;
+ case PSERIES_HP_ELOG_ID_DRC_INDEX:
+ hp_elog->_drc_u.drc_index =
+ be32_to_cpu(hp_elog->_drc_u.drc_index);
+ break;
+ case PSERIES_HP_ELOG_ID_DRC_IC:
+ hp_elog->_drc_u.ic.count =
+ be32_to_cpu(hp_elog->_drc_u.ic.count);
+ hp_elog->_drc_u.ic.index =
+ be32_to_cpu(hp_elog->_drc_u.ic.index);
+ }
+
+ switch (hp_elog->resource) {
+ case PSERIES_HP_ELOG_RESOURCE_MEM:
+ rc = dlpar_memory(hp_elog);
+ break;
+ case PSERIES_HP_ELOG_RESOURCE_CPU:
+ rc = dlpar_cpu(hp_elog);
+ break;
+ case PSERIES_HP_ELOG_RESOURCE_PMEM:
+ rc = dlpar_hp_pmem(hp_elog);
+ break;
+
+ default:
+ pr_warn_ratelimited("Invalid resource (%d) specified\n",
+ hp_elog->resource);
+ rc = -EINVAL;
+ }
+
+ return rc;
+}
+
+static void pseries_hp_work_fn(struct work_struct *work)
+{
+ struct pseries_hp_work *hp_work =
+ container_of(work, struct pseries_hp_work, work);
+
+ handle_dlpar_errorlog(hp_work->errlog);
+
+ kfree(hp_work->errlog);
+ kfree((void *)work);
+}
+
+void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
+{
+ struct pseries_hp_work *work;
+ struct pseries_hp_errorlog *hp_errlog_copy;
+
+ hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
+ if (!hp_errlog_copy)
+ return;
+
+ work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
+ if (work) {
+ INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
+ work->errlog = hp_errlog_copy;
+ queue_work(pseries_hp_wq, (struct work_struct *)work);
+ } else {
+ kfree(hp_errlog_copy);
+ }
+}
+
+static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
+{
+ char *arg;
+
+ arg = strsep(cmd, " ");
+ if (!arg)
+ return -EINVAL;
+
+ if (sysfs_streq(arg, "memory")) {
+ hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
+ } else if (sysfs_streq(arg, "cpu")) {
+ hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
+ } else {
+ pr_err("Invalid resource specified.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
+{
+ char *arg;
+
+ arg = strsep(cmd, " ");
+ if (!arg)
+ return -EINVAL;
+
+ if (sysfs_streq(arg, "add")) {
+ hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
+ } else if (sysfs_streq(arg, "remove")) {
+ hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
+ } else {
+ pr_err("Invalid action specified.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
+{
+ char *arg;
+ u32 count, index;
+
+ arg = strsep(cmd, " ");
+ if (!arg)
+ return -EINVAL;
+
+ if (sysfs_streq(arg, "indexed-count")) {
+ hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
+ arg = strsep(cmd, " ");
+ if (!arg) {
+ pr_err("No DRC count specified.\n");
+ return -EINVAL;
+ }
+
+ if (kstrtou32(arg, 0, &count)) {
+ pr_err("Invalid DRC count specified.\n");
+ return -EINVAL;
+ }
+
+ arg = strsep(cmd, " ");
+ if (!arg) {
+ pr_err("No DRC Index specified.\n");
+ return -EINVAL;
+ }
+
+ if (kstrtou32(arg, 0, &index)) {
+ pr_err("Invalid DRC Index specified.\n");
+ return -EINVAL;
+ }
+
+ hp_elog->_drc_u.ic.count = cpu_to_be32(count);
+ hp_elog->_drc_u.ic.index = cpu_to_be32(index);
+ } else if (sysfs_streq(arg, "index")) {
+ hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
+ arg = strsep(cmd, " ");
+ if (!arg) {
+ pr_err("No DRC Index specified.\n");
+ return -EINVAL;
+ }
+
+ if (kstrtou32(arg, 0, &index)) {
+ pr_err("Invalid DRC Index specified.\n");
+ return -EINVAL;
+ }
+
+ hp_elog->_drc_u.drc_index = cpu_to_be32(index);
+ } else if (sysfs_streq(arg, "count")) {
+ hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
+ arg = strsep(cmd, " ");
+ if (!arg) {
+ pr_err("No DRC count specified.\n");
+ return -EINVAL;
+ }
+
+ if (kstrtou32(arg, 0, &count)) {
+ pr_err("Invalid DRC count specified.\n");
+ return -EINVAL;
+ }
+
+ hp_elog->_drc_u.drc_count = cpu_to_be32(count);
+ } else {
+ pr_err("Invalid id_type specified.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pseries_hp_errorlog hp_elog;
+ char *argbuf;
+ char *args;
+ int rc;
+
+ args = argbuf = kstrdup(buf, GFP_KERNEL);
+ if (!argbuf) {
+ pr_info("Could not allocate resources for DLPAR operation\n");
+ kfree(argbuf);
+ return -ENOMEM;
+ }
+
+ /*
+ * Parse out the request from the user, this will be in the form:
+ * <resource> <action> <id_type> <id>
+ */
+ rc = dlpar_parse_resource(&args, &hp_elog);
+ if (rc)
+ goto dlpar_store_out;
+
+ rc = dlpar_parse_action(&args, &hp_elog);
+ if (rc)
+ goto dlpar_store_out;
+
+ rc = dlpar_parse_id_type(&args, &hp_elog);
+ if (rc)
+ goto dlpar_store_out;
+
+ rc = handle_dlpar_errorlog(&hp_elog);
+
+dlpar_store_out:
+ kfree(argbuf);
+
+ if (rc)
+ pr_err("Could not handle DLPAR request \"%s\"\n", buf);
+
+ return rc ? rc : count;
+}
+
+static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", "memory,cpu");
+}
+
+static CLASS_ATTR_RW(dlpar);
+
+int __init dlpar_workqueue_init(void)
+{
+ if (pseries_hp_wq)
+ return 0;
+
+ pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
+ WQ_UNBOUND, 1);
+
+ return pseries_hp_wq ? 0 : -ENOMEM;
+}
+
+static int __init dlpar_sysfs_init(void)
+{
+ int rc;
+
+ rc = dlpar_workqueue_init();
+ if (rc)
+ return rc;
+
+ return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
+}
+machine_device_initcall(pseries, dlpar_sysfs_init);
+