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-rw-r--r--arch/powerpc/platforms/pseries/mobility.c834
1 files changed, 834 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
new file mode 100644
index 000000000..634fac5db
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/mobility.c
@@ -0,0 +1,834 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Support for Partition Mobility/Migration
+ *
+ * Copyright (C) 2010 Nathan Fontenot
+ * Copyright (C) 2010 IBM Corporation
+ */
+
+
+#define pr_fmt(fmt) "mobility: " fmt
+
+#include <linux/cpu.h>
+#include <linux/kernel.h>
+#include <linux/kobject.h>
+#include <linux/nmi.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/stat.h>
+#include <linux/stop_machine.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/stringify.h>
+
+#include <asm/machdep.h>
+#include <asm/rtas.h>
+#include "pseries.h"
+#include "vas.h" /* vas_migration_handler() */
+#include "../../kernel/cacheinfo.h"
+
+static struct kobject *mobility_kobj;
+
+struct update_props_workarea {
+ __be32 phandle;
+ __be32 state;
+ __be64 reserved;
+ __be32 nprops;
+} __packed;
+
+#define NODE_ACTION_MASK 0xff000000
+#define NODE_COUNT_MASK 0x00ffffff
+
+#define DELETE_DT_NODE 0x01000000
+#define UPDATE_DT_NODE 0x02000000
+#define ADD_DT_NODE 0x03000000
+
+#define MIGRATION_SCOPE (1)
+#define PRRN_SCOPE -2
+
+#ifdef CONFIG_PPC_WATCHDOG
+static unsigned int nmi_wd_lpm_factor = 200;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table nmi_wd_lpm_factor_ctl_table[] = {
+ {
+ .procname = "nmi_wd_lpm_factor",
+ .data = &nmi_wd_lpm_factor,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_douintvec_minmax,
+ },
+ {}
+};
+static struct ctl_table nmi_wd_lpm_factor_sysctl_root[] = {
+ {
+ .procname = "kernel",
+ .mode = 0555,
+ .child = nmi_wd_lpm_factor_ctl_table,
+ },
+ {}
+};
+
+static int __init register_nmi_wd_lpm_factor_sysctl(void)
+{
+ register_sysctl_table(nmi_wd_lpm_factor_sysctl_root);
+
+ return 0;
+}
+device_initcall(register_nmi_wd_lpm_factor_sysctl);
+#endif /* CONFIG_SYSCTL */
+#endif /* CONFIG_PPC_WATCHDOG */
+
+static int mobility_rtas_call(int token, char *buf, s32 scope)
+{
+ int rc;
+
+ spin_lock(&rtas_data_buf_lock);
+
+ memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
+ rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
+ memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
+
+ spin_unlock(&rtas_data_buf_lock);
+ return rc;
+}
+
+static int delete_dt_node(struct device_node *dn)
+{
+ struct device_node *pdn;
+ bool is_platfac;
+
+ pdn = of_get_parent(dn);
+ is_platfac = of_node_is_type(dn, "ibm,platform-facilities") ||
+ of_node_is_type(pdn, "ibm,platform-facilities");
+ of_node_put(pdn);
+
+ /*
+ * The drivers that bind to nodes in the platform-facilities
+ * hierarchy don't support node removal, and the removal directive
+ * from firmware is always followed by an add of an equivalent
+ * node. The capability (e.g. RNG, encryption, compression)
+ * represented by the node is never interrupted by the migration.
+ * So ignore changes to this part of the tree.
+ */
+ if (is_platfac) {
+ pr_notice("ignoring remove operation for %pOFfp\n", dn);
+ return 0;
+ }
+
+ pr_debug("removing node %pOFfp\n", dn);
+ dlpar_detach_node(dn);
+ return 0;
+}
+
+static int update_dt_property(struct device_node *dn, struct property **prop,
+ const char *name, u32 vd, char *value)
+{
+ struct property *new_prop = *prop;
+ int more = 0;
+
+ /* A negative 'vd' value indicates that only part of the new property
+ * value is contained in the buffer and we need to call
+ * ibm,update-properties again to get the rest of the value.
+ *
+ * A negative value is also the two's compliment of the actual value.
+ */
+ if (vd & 0x80000000) {
+ vd = ~vd + 1;
+ more = 1;
+ }
+
+ if (new_prop) {
+ /* partial property fixup */
+ char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
+ if (!new_data)
+ return -ENOMEM;
+
+ memcpy(new_data, new_prop->value, new_prop->length);
+ memcpy(new_data + new_prop->length, value, vd);
+
+ kfree(new_prop->value);
+ new_prop->value = new_data;
+ new_prop->length += vd;
+ } else {
+ new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
+ if (!new_prop)
+ return -ENOMEM;
+
+ new_prop->name = kstrdup(name, GFP_KERNEL);
+ if (!new_prop->name) {
+ kfree(new_prop);
+ return -ENOMEM;
+ }
+
+ new_prop->length = vd;
+ new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
+ if (!new_prop->value) {
+ kfree(new_prop->name);
+ kfree(new_prop);
+ return -ENOMEM;
+ }
+
+ memcpy(new_prop->value, value, vd);
+ *prop = new_prop;
+ }
+
+ if (!more) {
+ pr_debug("updating node %pOF property %s\n", dn, name);
+ of_update_property(dn, new_prop);
+ *prop = NULL;
+ }
+
+ return 0;
+}
+
+static int update_dt_node(struct device_node *dn, s32 scope)
+{
+ struct update_props_workarea *upwa;
+ struct property *prop = NULL;
+ int i, rc, rtas_rc;
+ char *prop_data;
+ char *rtas_buf;
+ int update_properties_token;
+ u32 nprops;
+ u32 vd;
+
+ update_properties_token = rtas_token("ibm,update-properties");
+ if (update_properties_token == RTAS_UNKNOWN_SERVICE)
+ return -EINVAL;
+
+ rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
+ if (!rtas_buf)
+ return -ENOMEM;
+
+ upwa = (struct update_props_workarea *)&rtas_buf[0];
+ upwa->phandle = cpu_to_be32(dn->phandle);
+
+ do {
+ rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
+ scope);
+ if (rtas_rc < 0)
+ break;
+
+ prop_data = rtas_buf + sizeof(*upwa);
+ nprops = be32_to_cpu(upwa->nprops);
+
+ /* On the first call to ibm,update-properties for a node the
+ * first property value descriptor contains an empty
+ * property name, the property value length encoded as u32,
+ * and the property value is the node path being updated.
+ */
+ if (*prop_data == 0) {
+ prop_data++;
+ vd = be32_to_cpu(*(__be32 *)prop_data);
+ prop_data += vd + sizeof(vd);
+ nprops--;
+ }
+
+ for (i = 0; i < nprops; i++) {
+ char *prop_name;
+
+ prop_name = prop_data;
+ prop_data += strlen(prop_name) + 1;
+ vd = be32_to_cpu(*(__be32 *)prop_data);
+ prop_data += sizeof(vd);
+
+ switch (vd) {
+ case 0x00000000:
+ /* name only property, nothing to do */
+ break;
+
+ case 0x80000000:
+ of_remove_property(dn, of_find_property(dn,
+ prop_name, NULL));
+ prop = NULL;
+ break;
+
+ default:
+ rc = update_dt_property(dn, &prop, prop_name,
+ vd, prop_data);
+ if (rc) {
+ pr_err("updating %s property failed: %d\n",
+ prop_name, rc);
+ }
+
+ prop_data += vd;
+ break;
+ }
+
+ cond_resched();
+ }
+
+ cond_resched();
+ } while (rtas_rc == 1);
+
+ kfree(rtas_buf);
+ return 0;
+}
+
+static int add_dt_node(struct device_node *parent_dn, __be32 drc_index)
+{
+ struct device_node *dn;
+ int rc;
+
+ dn = dlpar_configure_connector(drc_index, parent_dn);
+ if (!dn)
+ return -ENOENT;
+
+ /*
+ * Since delete_dt_node() ignores this node type, this is the
+ * necessary counterpart. We also know that a platform-facilities
+ * node returned from dlpar_configure_connector() has children
+ * attached, and dlpar_attach_node() only adds the parent, leaking
+ * the children. So ignore these on the add side for now.
+ */
+ if (of_node_is_type(dn, "ibm,platform-facilities")) {
+ pr_notice("ignoring add operation for %pOF\n", dn);
+ dlpar_free_cc_nodes(dn);
+ return 0;
+ }
+
+ rc = dlpar_attach_node(dn, parent_dn);
+ if (rc)
+ dlpar_free_cc_nodes(dn);
+
+ pr_debug("added node %pOFfp\n", dn);
+
+ return rc;
+}
+
+static int pseries_devicetree_update(s32 scope)
+{
+ char *rtas_buf;
+ __be32 *data;
+ int update_nodes_token;
+ int rc;
+
+ update_nodes_token = rtas_token("ibm,update-nodes");
+ if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
+ return 0;
+
+ rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
+ if (!rtas_buf)
+ return -ENOMEM;
+
+ do {
+ rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope);
+ if (rc && rc != 1)
+ break;
+
+ data = (__be32 *)rtas_buf + 4;
+ while (be32_to_cpu(*data) & NODE_ACTION_MASK) {
+ int i;
+ u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK;
+ u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK;
+
+ data++;
+
+ for (i = 0; i < node_count; i++) {
+ struct device_node *np;
+ __be32 phandle = *data++;
+ __be32 drc_index;
+
+ np = of_find_node_by_phandle(be32_to_cpu(phandle));
+ if (!np) {
+ pr_warn("Failed lookup: phandle 0x%x for action 0x%x\n",
+ be32_to_cpu(phandle), action);
+ continue;
+ }
+
+ switch (action) {
+ case DELETE_DT_NODE:
+ delete_dt_node(np);
+ break;
+ case UPDATE_DT_NODE:
+ update_dt_node(np, scope);
+ break;
+ case ADD_DT_NODE:
+ drc_index = *data++;
+ add_dt_node(np, drc_index);
+ break;
+ }
+
+ of_node_put(np);
+ cond_resched();
+ }
+ }
+
+ cond_resched();
+ } while (rc == 1);
+
+ kfree(rtas_buf);
+ return rc;
+}
+
+void post_mobility_fixup(void)
+{
+ int rc;
+
+ rtas_activate_firmware();
+
+ /*
+ * We don't want CPUs to go online/offline while the device
+ * tree is being updated.
+ */
+ cpus_read_lock();
+
+ /*
+ * It's common for the destination firmware to replace cache
+ * nodes. Release all of the cacheinfo hierarchy's references
+ * before updating the device tree.
+ */
+ cacheinfo_teardown();
+
+ rc = pseries_devicetree_update(MIGRATION_SCOPE);
+ if (rc)
+ pr_err("device tree update failed: %d\n", rc);
+
+ cacheinfo_rebuild();
+
+ cpus_read_unlock();
+
+ /* Possibly switch to a new L1 flush type */
+ pseries_setup_security_mitigations();
+
+ /* Reinitialise system information for hv-24x7 */
+ read_24x7_sys_info();
+
+ return;
+}
+
+static int poll_vasi_state(u64 handle, unsigned long *res)
+{
+ unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+ long hvrc;
+ int ret;
+
+ hvrc = plpar_hcall(H_VASI_STATE, retbuf, handle);
+ switch (hvrc) {
+ case H_SUCCESS:
+ ret = 0;
+ *res = retbuf[0];
+ break;
+ case H_PARAMETER:
+ ret = -EINVAL;
+ break;
+ case H_FUNCTION:
+ ret = -EOPNOTSUPP;
+ break;
+ case H_HARDWARE:
+ default:
+ pr_err("unexpected H_VASI_STATE result %ld\n", hvrc);
+ ret = -EIO;
+ break;
+ }
+ return ret;
+}
+
+static int wait_for_vasi_session_suspending(u64 handle)
+{
+ unsigned long state;
+ int ret;
+
+ /*
+ * Wait for transition from H_VASI_ENABLED to
+ * H_VASI_SUSPENDING. Treat anything else as an error.
+ */
+ while (true) {
+ ret = poll_vasi_state(handle, &state);
+
+ if (ret != 0 || state == H_VASI_SUSPENDING) {
+ break;
+ } else if (state == H_VASI_ENABLED) {
+ ssleep(1);
+ } else {
+ pr_err("unexpected H_VASI_STATE result %lu\n", state);
+ ret = -EIO;
+ break;
+ }
+ }
+
+ /*
+ * Proceed even if H_VASI_STATE is unavailable. If H_JOIN or
+ * ibm,suspend-me are also unimplemented, we'll recover then.
+ */
+ if (ret == -EOPNOTSUPP)
+ ret = 0;
+
+ return ret;
+}
+
+static void wait_for_vasi_session_completed(u64 handle)
+{
+ unsigned long state = 0;
+ int ret;
+
+ pr_info("waiting for memory transfer to complete...\n");
+
+ /*
+ * Wait for transition from H_VASI_RESUMED to H_VASI_COMPLETED.
+ */
+ while (true) {
+ ret = poll_vasi_state(handle, &state);
+
+ /*
+ * If the memory transfer is already complete and the migration
+ * has been cleaned up by the hypervisor, H_PARAMETER is return,
+ * which is translate in EINVAL by poll_vasi_state().
+ */
+ if (ret == -EINVAL || (!ret && state == H_VASI_COMPLETED)) {
+ pr_info("memory transfer completed.\n");
+ break;
+ }
+
+ if (ret) {
+ pr_err("H_VASI_STATE return error (%d)\n", ret);
+ break;
+ }
+
+ if (state != H_VASI_RESUMED) {
+ pr_err("unexpected H_VASI_STATE result %lu\n", state);
+ break;
+ }
+
+ msleep(500);
+ }
+}
+
+static void prod_single(unsigned int target_cpu)
+{
+ long hvrc;
+ int hwid;
+
+ hwid = get_hard_smp_processor_id(target_cpu);
+ hvrc = plpar_hcall_norets(H_PROD, hwid);
+ if (hvrc == H_SUCCESS)
+ return;
+ pr_err_ratelimited("H_PROD of CPU %u (hwid %d) error: %ld\n",
+ target_cpu, hwid, hvrc);
+}
+
+static void prod_others(void)
+{
+ unsigned int cpu;
+
+ for_each_online_cpu(cpu) {
+ if (cpu != smp_processor_id())
+ prod_single(cpu);
+ }
+}
+
+static u16 clamp_slb_size(void)
+{
+#ifdef CONFIG_PPC_64S_HASH_MMU
+ u16 prev = mmu_slb_size;
+
+ slb_set_size(SLB_MIN_SIZE);
+
+ return prev;
+#else
+ return 0;
+#endif
+}
+
+static int do_suspend(void)
+{
+ u16 saved_slb_size;
+ int status;
+ int ret;
+
+ pr_info("calling ibm,suspend-me on CPU %i\n", smp_processor_id());
+
+ /*
+ * The destination processor model may have fewer SLB entries
+ * than the source. We reduce mmu_slb_size to a safe minimum
+ * before suspending in order to minimize the possibility of
+ * programming non-existent entries on the destination. If
+ * suspend fails, we restore it before returning. On success
+ * the OF reconfig path will update it from the new device
+ * tree after resuming on the destination.
+ */
+ saved_slb_size = clamp_slb_size();
+
+ ret = rtas_ibm_suspend_me(&status);
+ if (ret != 0) {
+ pr_err("ibm,suspend-me error: %d\n", status);
+ slb_set_size(saved_slb_size);
+ }
+
+ return ret;
+}
+
+/**
+ * struct pseries_suspend_info - State shared between CPUs for join/suspend.
+ * @counter: Threads are to increment this upon resuming from suspend
+ * or if an error is received from H_JOIN. The thread which performs
+ * the first increment (i.e. sets it to 1) is responsible for
+ * waking the other threads.
+ * @done: False if join/suspend is in progress. True if the operation is
+ * complete (successful or not).
+ */
+struct pseries_suspend_info {
+ atomic_t counter;
+ bool done;
+};
+
+static int do_join(void *arg)
+{
+ struct pseries_suspend_info *info = arg;
+ atomic_t *counter = &info->counter;
+ long hvrc;
+ int ret;
+
+retry:
+ /* Must ensure MSR.EE off for H_JOIN. */
+ hard_irq_disable();
+ hvrc = plpar_hcall_norets(H_JOIN);
+
+ switch (hvrc) {
+ case H_CONTINUE:
+ /*
+ * All other CPUs are offline or in H_JOIN. This CPU
+ * attempts the suspend.
+ */
+ ret = do_suspend();
+ break;
+ case H_SUCCESS:
+ /*
+ * The suspend is complete and this cpu has received a
+ * prod, or we've received a stray prod from unrelated
+ * code (e.g. paravirt spinlocks) and we need to join
+ * again.
+ *
+ * This barrier orders the return from H_JOIN above vs
+ * the load of info->done. It pairs with the barrier
+ * in the wakeup/prod path below.
+ */
+ smp_mb();
+ if (READ_ONCE(info->done) == false) {
+ pr_info_ratelimited("premature return from H_JOIN on CPU %i, retrying",
+ smp_processor_id());
+ goto retry;
+ }
+ ret = 0;
+ break;
+ case H_BAD_MODE:
+ case H_HARDWARE:
+ default:
+ ret = -EIO;
+ pr_err_ratelimited("H_JOIN error %ld on CPU %i\n",
+ hvrc, smp_processor_id());
+ break;
+ }
+
+ if (atomic_inc_return(counter) == 1) {
+ pr_info("CPU %u waking all threads\n", smp_processor_id());
+ WRITE_ONCE(info->done, true);
+ /*
+ * This barrier orders the store to info->done vs subsequent
+ * H_PRODs to wake the other CPUs. It pairs with the barrier
+ * in the H_SUCCESS case above.
+ */
+ smp_mb();
+ prod_others();
+ }
+ /*
+ * Execution may have been suspended for several seconds, so
+ * reset the watchdog.
+ */
+ touch_nmi_watchdog();
+ return ret;
+}
+
+/*
+ * Abort reason code byte 0. We use only the 'Migrating partition' value.
+ */
+enum vasi_aborting_entity {
+ ORCHESTRATOR = 1,
+ VSP_SOURCE = 2,
+ PARTITION_FIRMWARE = 3,
+ PLATFORM_FIRMWARE = 4,
+ VSP_TARGET = 5,
+ MIGRATING_PARTITION = 6,
+};
+
+static void pseries_cancel_migration(u64 handle, int err)
+{
+ u32 reason_code;
+ u32 detail;
+ u8 entity;
+ long hvrc;
+
+ entity = MIGRATING_PARTITION;
+ detail = abs(err) & 0xffffff;
+ reason_code = (entity << 24) | detail;
+
+ hvrc = plpar_hcall_norets(H_VASI_SIGNAL, handle,
+ H_VASI_SIGNAL_CANCEL, reason_code);
+ if (hvrc)
+ pr_err("H_VASI_SIGNAL error: %ld\n", hvrc);
+}
+
+static int pseries_suspend(u64 handle)
+{
+ const unsigned int max_attempts = 5;
+ unsigned int retry_interval_ms = 1;
+ unsigned int attempt = 1;
+ int ret;
+
+ while (true) {
+ struct pseries_suspend_info info;
+ unsigned long vasi_state;
+ int vasi_err;
+
+ info = (struct pseries_suspend_info) {
+ .counter = ATOMIC_INIT(0),
+ .done = false,
+ };
+
+ ret = stop_machine(do_join, &info, cpu_online_mask);
+ if (ret == 0)
+ break;
+ /*
+ * Encountered an error. If the VASI stream is still
+ * in Suspending state, it's likely a transient
+ * condition related to some device in the partition
+ * and we can retry in the hope that the cause has
+ * cleared after some delay.
+ *
+ * A better design would allow drivers etc to prepare
+ * for the suspend and avoid conditions which prevent
+ * the suspend from succeeding. For now, we have this
+ * mitigation.
+ */
+ pr_notice("Partition suspend attempt %u of %u error: %d\n",
+ attempt, max_attempts, ret);
+
+ if (attempt == max_attempts)
+ break;
+
+ vasi_err = poll_vasi_state(handle, &vasi_state);
+ if (vasi_err == 0) {
+ if (vasi_state != H_VASI_SUSPENDING) {
+ pr_notice("VASI state %lu after failed suspend\n",
+ vasi_state);
+ break;
+ }
+ } else if (vasi_err != -EOPNOTSUPP) {
+ pr_err("VASI state poll error: %d", vasi_err);
+ break;
+ }
+
+ pr_notice("Will retry partition suspend after %u ms\n",
+ retry_interval_ms);
+
+ msleep(retry_interval_ms);
+ retry_interval_ms *= 10;
+ attempt++;
+ }
+
+ return ret;
+}
+
+static int pseries_migrate_partition(u64 handle)
+{
+ int ret;
+ unsigned int factor = 0;
+
+#ifdef CONFIG_PPC_WATCHDOG
+ factor = nmi_wd_lpm_factor;
+#endif
+ /*
+ * When the migration is initiated, the hypervisor changes VAS
+ * mappings to prepare before OS gets the notification and
+ * closes all VAS windows. NX generates continuous faults during
+ * this time and the user space can not differentiate these
+ * faults from the migration event. So reduce this time window
+ * by closing VAS windows at the beginning of this function.
+ */
+ vas_migration_handler(VAS_SUSPEND);
+
+ ret = wait_for_vasi_session_suspending(handle);
+ if (ret)
+ goto out;
+
+ if (factor)
+ watchdog_nmi_set_timeout_pct(factor);
+
+ ret = pseries_suspend(handle);
+ if (ret == 0) {
+ post_mobility_fixup();
+ /*
+ * Wait until the memory transfer is complete, so that the user
+ * space process returns from the syscall after the transfer is
+ * complete. This allows the user hooks to be executed at the
+ * right time.
+ */
+ wait_for_vasi_session_completed(handle);
+ } else
+ pseries_cancel_migration(handle, ret);
+
+ if (factor)
+ watchdog_nmi_set_timeout_pct(0);
+
+out:
+ vas_migration_handler(VAS_RESUME);
+
+ return ret;
+}
+
+int rtas_syscall_dispatch_ibm_suspend_me(u64 handle)
+{
+ return pseries_migrate_partition(handle);
+}
+
+static ssize_t migration_store(struct class *class,
+ struct class_attribute *attr, const char *buf,
+ size_t count)
+{
+ u64 streamid;
+ int rc;
+
+ rc = kstrtou64(buf, 0, &streamid);
+ if (rc)
+ return rc;
+
+ rc = pseries_migrate_partition(streamid);
+ if (rc)
+ return rc;
+
+ return count;
+}
+
+/*
+ * Used by drmgr to determine the kernel behavior of the migration interface.
+ *
+ * Version 1: Performs all PAPR requirements for migration including
+ * firmware activation and device tree update.
+ */
+#define MIGRATION_API_VERSION 1
+
+static CLASS_ATTR_WO(migration);
+static CLASS_ATTR_STRING(api_version, 0444, __stringify(MIGRATION_API_VERSION));
+
+static int __init mobility_sysfs_init(void)
+{
+ int rc;
+
+ mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
+ if (!mobility_kobj)
+ return -ENOMEM;
+
+ rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
+ if (rc)
+ pr_err("unable to create migration sysfs file (%d)\n", rc);
+
+ rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr);
+ if (rc)
+ pr_err("unable to create api_version sysfs file (%d)\n", rc);
+
+ return 0;
+}
+machine_device_initcall(pseries, mobility_sysfs_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 15:01:19 +0000