mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 00:10:09 +00:00
powerpc/pseries: Consolidate CPU hotplug code to hotplug-cpu.c
No functional changes, this patch is simply a move of the cpu hotplug code from pseries/dlpar.c to pseries/hotplug-cpu.c. This is in an effort to consolidate all of the cpu hotplug code in a common place. Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nathan Fontenot
Michael Ellerman
parent
1f859adb92
commit
183deeea58
2 changed files with 219 additions and 225 deletions
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@ -20,7 +20,6 @@
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#include <linux/of.h>
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#include "of_helpers.h"
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#include "offline_states.h"
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#include "pseries.h"
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#include <asm/prom.h>
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@ -338,220 +337,6 @@ int dlpar_release_drc(u32 drc_index)
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return 0;
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}
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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static int dlpar_online_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const __be32 *intserv;
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u32 thread;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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thread = be32_to_cpu(intserv[i]);
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != thread)
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continue;
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BUG_ON(get_cpu_current_state(cpu)
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!= CPU_STATE_OFFLINE);
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cpu_maps_update_done();
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rc = device_online(get_cpu_device(cpu));
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if (rc)
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goto out;
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cpu_maps_update_begin();
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break;
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}
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if (cpu == num_possible_cpus())
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printk(KERN_WARNING "Could not find cpu to online "
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"with physical id 0x%x\n", thread);
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}
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cpu_maps_update_done();
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out:
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return rc;
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}
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static bool dlpar_cpu_exists(struct device_node *parent, u32 drc_index)
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{
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struct device_node *child = NULL;
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u32 my_drc_index;
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bool found;
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int rc;
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/* Assume cpu doesn't exist */
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found = false;
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for_each_child_of_node(parent, child) {
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rc = of_property_read_u32(child, "ibm,my-drc-index",
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&my_drc_index);
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if (rc)
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continue;
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if (my_drc_index == drc_index) {
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of_node_put(child);
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found = true;
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break;
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}
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}
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return found;
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}
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static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
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{
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struct device_node *dn, *parent;
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u32 drc_index;
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int rc;
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rc = kstrtou32(buf, 0, &drc_index);
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if (rc)
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return -EINVAL;
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parent = of_find_node_by_path("/cpus");
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if (!parent)
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return -ENODEV;
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if (dlpar_cpu_exists(parent, drc_index)) {
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of_node_put(parent);
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printk(KERN_WARNING "CPU with drc index %x already exists\n",
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drc_index);
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return -EINVAL;
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}
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rc = dlpar_acquire_drc(drc_index);
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if (rc) {
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of_node_put(parent);
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return -EINVAL;
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}
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dn = dlpar_configure_connector(cpu_to_be32(drc_index), parent);
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of_node_put(parent);
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if (!dn) {
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dlpar_release_drc(drc_index);
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return -EINVAL;
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}
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rc = dlpar_attach_node(dn);
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if (rc) {
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dlpar_release_drc(drc_index);
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dlpar_free_cc_nodes(dn);
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return rc;
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}
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rc = dlpar_online_cpu(dn);
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if (rc)
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return rc;
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return count;
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}
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static int dlpar_offline_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const __be32 *intserv;
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u32 thread;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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thread = be32_to_cpu(intserv[i]);
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != thread)
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continue;
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if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
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break;
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if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
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set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
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cpu_maps_update_done();
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rc = device_offline(get_cpu_device(cpu));
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if (rc)
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goto out;
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cpu_maps_update_begin();
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break;
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}
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/*
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* The cpu is in CPU_STATE_INACTIVE.
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* Upgrade it's state to CPU_STATE_OFFLINE.
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*/
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set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
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BUG_ON(plpar_hcall_norets(H_PROD, thread)
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!= H_SUCCESS);
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__cpu_die(cpu);
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break;
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}
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if (cpu == num_possible_cpus())
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printk(KERN_WARNING "Could not find cpu to offline "
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"with physical id 0x%x\n", thread);
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}
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cpu_maps_update_done();
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out:
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return rc;
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}
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static ssize_t dlpar_cpu_release(const char *buf, size_t count)
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{
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struct device_node *dn;
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u32 drc_index;
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int rc;
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dn = of_find_node_by_path(buf);
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if (!dn)
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return -EINVAL;
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rc = of_property_read_u32(dn, "ibm,my-drc-index", &drc_index);
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if (rc) {
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of_node_put(dn);
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return -EINVAL;
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}
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rc = dlpar_offline_cpu(dn);
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if (rc) {
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of_node_put(dn);
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return -EINVAL;
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}
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rc = dlpar_release_drc(drc_index);
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if (rc) {
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of_node_put(dn);
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return rc;
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}
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rc = dlpar_detach_node(dn);
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if (rc) {
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dlpar_acquire_drc(drc_index);
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return rc;
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}
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of_node_put(dn);
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return count;
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}
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#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
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static int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
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{
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int rc;
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@ -659,16 +444,7 @@ static CLASS_ATTR(dlpar, S_IWUSR, NULL, dlpar_store);
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static int __init pseries_dlpar_init(void)
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{
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int rc;
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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ppc_md.cpu_probe = dlpar_cpu_probe;
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ppc_md.cpu_release = dlpar_cpu_release;
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#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
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rc = sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
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return rc;
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return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
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}
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machine_device_initcall(pseries, pseries_dlpar_init);
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@ -32,6 +32,7 @@
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#include <asm/xics.h>
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#include <asm/plpar_wrappers.h>
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#include "pseries.h"
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#include "offline_states.h"
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/* This version can't take the spinlock, because it never returns */
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@ -334,6 +335,218 @@ static void pseries_remove_processor(struct device_node *np)
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cpu_maps_update_done();
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}
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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static int dlpar_online_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const __be32 *intserv;
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u32 thread;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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thread = be32_to_cpu(intserv[i]);
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != thread)
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continue;
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BUG_ON(get_cpu_current_state(cpu)
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!= CPU_STATE_OFFLINE);
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cpu_maps_update_done();
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rc = device_online(get_cpu_device(cpu));
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if (rc)
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goto out;
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cpu_maps_update_begin();
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break;
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}
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if (cpu == num_possible_cpus())
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printk(KERN_WARNING "Could not find cpu to online "
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"with physical id 0x%x\n", thread);
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}
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cpu_maps_update_done();
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out:
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return rc;
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}
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static bool dlpar_cpu_exists(struct device_node *parent, u32 drc_index)
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{
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struct device_node *child = NULL;
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u32 my_drc_index;
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bool found;
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int rc;
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/* Assume cpu doesn't exist */
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found = false;
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for_each_child_of_node(parent, child) {
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rc = of_property_read_u32(child, "ibm,my-drc-index",
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&my_drc_index);
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if (rc)
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continue;
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if (my_drc_index == drc_index) {
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of_node_put(child);
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found = true;
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break;
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}
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}
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return found;
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}
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static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
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{
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struct device_node *dn, *parent;
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u32 drc_index;
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int rc;
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rc = kstrtou32(buf, 0, &drc_index);
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if (rc)
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return -EINVAL;
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parent = of_find_node_by_path("/cpus");
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if (!parent)
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return -ENODEV;
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if (dlpar_cpu_exists(parent, drc_index)) {
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of_node_put(parent);
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printk(KERN_WARNING "CPU with drc index %x already exists\n",
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drc_index);
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return -EINVAL;
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}
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rc = dlpar_acquire_drc(drc_index);
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if (rc) {
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of_node_put(parent);
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return -EINVAL;
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}
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dn = dlpar_configure_connector(cpu_to_be32(drc_index), parent);
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of_node_put(parent);
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if (!dn)
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return -EINVAL;
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rc = dlpar_attach_node(dn);
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if (rc) {
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dlpar_release_drc(drc_index);
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dlpar_free_cc_nodes(dn);
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return rc;
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}
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rc = dlpar_online_cpu(dn);
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if (rc)
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return rc;
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return count;
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}
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static int dlpar_offline_cpu(struct device_node *dn)
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{
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int rc = 0;
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unsigned int cpu;
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int len, nthreads, i;
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const __be32 *intserv;
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u32 thread;
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
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if (!intserv)
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return -EINVAL;
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nthreads = len / sizeof(u32);
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cpu_maps_update_begin();
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for (i = 0; i < nthreads; i++) {
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thread = be32_to_cpu(intserv[i]);
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for_each_present_cpu(cpu) {
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if (get_hard_smp_processor_id(cpu) != thread)
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continue;
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if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
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break;
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if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
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set_preferred_offline_state(cpu,
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CPU_STATE_OFFLINE);
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cpu_maps_update_done();
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rc = device_offline(get_cpu_device(cpu));
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if (rc)
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goto out;
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cpu_maps_update_begin();
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break;
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}
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/*
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* The cpu is in CPU_STATE_INACTIVE.
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* Upgrade it's state to CPU_STATE_OFFLINE.
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*/
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set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
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BUG_ON(plpar_hcall_norets(H_PROD, thread)
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!= H_SUCCESS);
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__cpu_die(cpu);
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break;
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}
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if (cpu == num_possible_cpus())
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printk(KERN_WARNING "Could not find cpu to offline with physical id 0x%x\n", thread);
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}
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cpu_maps_update_done();
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out:
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return rc;
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}
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static ssize_t dlpar_cpu_release(const char *buf, size_t count)
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{
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struct device_node *dn;
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u32 drc_index;
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int rc;
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dn = of_find_node_by_path(buf);
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if (!dn)
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return -EINVAL;
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rc = of_property_read_u32(dn, "ibm,my-drc-index", &drc_index);
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if (rc) {
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of_node_put(dn);
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return -EINVAL;
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}
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rc = dlpar_offline_cpu(dn);
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if (rc) {
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of_node_put(dn);
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return -EINVAL;
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}
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rc = dlpar_release_drc(drc_index);
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if (rc) {
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of_node_put(dn);
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return rc;
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}
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rc = dlpar_detach_node(dn);
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if (rc) {
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dlpar_acquire_drc(drc_index);
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return rc;
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}
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of_node_put(dn);
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return count;
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}
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#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
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static int pseries_smp_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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@ -380,6 +593,11 @@ static int __init pseries_cpu_hotplug_init(void)
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int cpu;
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int qcss_tok;
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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ppc_md.cpu_probe = dlpar_cpu_probe;
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ppc_md.cpu_release = dlpar_cpu_release;
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#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
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for_each_node_by_name(np, "interrupt-controller") {
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typep = of_get_property(np, "compatible", NULL);
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if (strstr(typep, "open-pic")) {
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