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authorGautham R Shenoy <ego@in.ibm.com>2009-11-26 09:58:55 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-12-09 17:09:35 +1100
commitb6db63d1a7f0138f348ba7a648df35ac6365988e (patch)
treed5e3aa14ba93f2dac15820bfec9fa2a6ae104206
parent8389b37dffdc695b4fb363ebe0ed9748bb3b48d0 (diff)
pseries/pseries: Add code to online/offline CPUs of a DLPAR node
Currently the cpu-allocation/deallocation on pSeries is a two step process from the Userspace. - Set the indicators and update the device tree by writing to the sysfs tunable "probe" during allocation and "release" during deallocation. - Online / Offline the CPUs of the allocated/would_be_deallocated node by writing to the sysfs tunable "online". This patch adds kernel code to online/offline the CPUs soon_after/just_before they have been allocated/would_be_deallocated. This way, the userspace tool that performs DLPAR operations would only have to deal with one set of sysfs tunables namely "probe" and release". Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com> Acked-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/platforms/pseries/dlpar.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index fe8d4b3c50c..642e1b2e5c4 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -16,6 +16,7 @@
#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>
@@ -287,6 +288,98 @@ int dlpar_detach_node(struct device_node *dn)
return 0;
}
+int online_node_cpus(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;
+
+}
+
+int offline_node_cpus(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;
+
+}
+
#define DR_ENTITY_SENSE 9003
#define DR_ENTITY_PRESENT 1
#define DR_ENTITY_UNUSABLE 2
@@ -385,6 +478,8 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
dlpar_free_cc_nodes(dn);
}
+ rc = online_node_cpus(dn);
+
return rc ? rc : count;
}
@@ -404,6 +499,12 @@ static ssize_t dlpar_cpu_release(const char *buf, size_t count)
return -EINVAL;
}
+ rc = offline_node_cpus(dn);
+ if (rc) {
+ of_node_put(dn);
+ return -EINVAL;
+ }
+
rc = dlpar_release_drc(*drc_index);
if (rc) {
of_node_put(dn);