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Diffstat (limited to 'arch/powerpc/platforms/pseries/hotplug-cpu.c')
-rw-r--r--arch/powerpc/platforms/pseries/hotplug-cpu.c244
1 files changed, 171 insertions, 73 deletions
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index bbda646b63b5..3e8cbfe7a80f 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -338,6 +338,62 @@ static void pseries_remove_processor(struct device_node *np)
cpu_maps_update_done();
}
+static int dlpar_offline_cpu(struct device_node *dn)
+{
+ int rc = 0;
+ unsigned int cpu;
+ int len, nthreads, i;
+ const __be32 *intserv;
+ u32 thread;
+
+ 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++) {
+ thread = be32_to_cpu(intserv[i]);
+ for_each_present_cpu(cpu) {
+ if (get_hard_smp_processor_id(cpu) != thread)
+ continue;
+
+ if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
+ break;
+
+ if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
+ set_preferred_offline_state(cpu,
+ CPU_STATE_OFFLINE);
+ cpu_maps_update_done();
+ timed_topology_update(1);
+ rc = device_offline(get_cpu_device(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);
+ WARN_ON(plpar_hcall_norets(H_PROD, thread) != H_SUCCESS);
+ __cpu_die(cpu);
+ break;
+ }
+ if (cpu == num_possible_cpus()) {
+ pr_warn("Could not find cpu to offline with physical id 0x%x\n",
+ thread);
+ }
+ }
+ cpu_maps_update_done();
+
+out:
+ return rc;
+}
+
static int dlpar_online_cpu(struct device_node *dn)
{
int rc = 0;
@@ -364,8 +420,10 @@ static int dlpar_online_cpu(struct device_node *dn)
timed_topology_update(1);
find_and_online_cpu_nid(cpu);
rc = device_online(get_cpu_device(cpu));
- if (rc)
+ if (rc) {
+ dlpar_offline_cpu(dn);
goto out;
+ }
cpu_maps_update_begin();
break;
@@ -407,17 +465,67 @@ static bool dlpar_cpu_exists(struct device_node *parent, u32 drc_index)
return found;
}
+static bool drc_info_valid_index(struct device_node *parent, u32 drc_index)
+{
+ struct property *info;
+ struct of_drc_info drc;
+ const __be32 *value;
+ u32 index;
+ int count, i, j;
+
+ info = of_find_property(parent, "ibm,drc-info", NULL);
+ if (!info)
+ return false;
+
+ value = of_prop_next_u32(info, NULL, &count);
+
+ /* First value of ibm,drc-info is number of drc-info records */
+ if (value)
+ value++;
+ else
+ return false;
+
+ for (i = 0; i < count; i++) {
+ if (of_read_drc_info_cell(&info, &value, &drc))
+ return false;
+
+ if (strncmp(drc.drc_type, "CPU", 3))
+ break;
+
+ if (drc_index > drc.last_drc_index)
+ continue;
+
+ index = drc.drc_index_start;
+ for (j = 0; j < drc.num_sequential_elems; j++) {
+ if (drc_index == index)
+ return true;
+
+ index += drc.sequential_inc;
+ }
+ }
+
+ return false;
+}
+
static bool valid_cpu_drc_index(struct device_node *parent, u32 drc_index)
{
bool found = false;
int rc, index;
- index = 0;
+ if (of_find_property(parent, "ibm,drc-info", NULL))
+ return drc_info_valid_index(parent, drc_index);
+
+ /* Note that the format of the ibm,drc-indexes array is
+ * the number of entries in the array followed by the array
+ * of drc values so we start looking at index = 1.
+ */
+ index = 1;
while (!found) {
u32 drc;
rc = of_property_read_u32_index(parent, "ibm,drc-indexes",
index++, &drc);
+
if (rc)
break;
@@ -505,63 +613,6 @@ static ssize_t dlpar_cpu_add(u32 drc_index)
return rc;
}
-static int dlpar_offline_cpu(struct device_node *dn)
-{
- int rc = 0;
- unsigned int cpu;
- int len, nthreads, i;
- const __be32 *intserv;
- u32 thread;
-
- 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++) {
- thread = be32_to_cpu(intserv[i]);
- for_each_present_cpu(cpu) {
- if (get_hard_smp_processor_id(cpu) != thread)
- continue;
-
- if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
- break;
-
- if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
- set_preferred_offline_state(cpu,
- CPU_STATE_OFFLINE);
- cpu_maps_update_done();
- timed_topology_update(1);
- rc = device_offline(get_cpu_device(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, thread)
- != 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", thread);
- }
- cpu_maps_update_done();
-
-out:
- return rc;
-
-}
-
static ssize_t dlpar_cpu_remove(struct device_node *dn, u32 drc_index)
{
int rc;
@@ -717,19 +768,52 @@ static int dlpar_cpu_remove_by_count(u32 cpus_to_remove)
return rc;
}
-static int find_dlpar_cpus_to_add(u32 *cpu_drcs, u32 cpus_to_add)
+static int find_drc_info_cpus_to_add(struct device_node *cpus,
+ struct property *info,
+ u32 *cpu_drcs, u32 cpus_to_add)
{
- struct device_node *parent;
+ struct of_drc_info drc;
+ const __be32 *value;
+ u32 count, drc_index;
int cpus_found = 0;
- int index, rc;
+ int i, j;
- parent = of_find_node_by_path("/cpus");
- if (!parent) {
- pr_warn("Could not find CPU root node in device tree\n");
- kfree(cpu_drcs);
+ if (!info)
return -1;
+
+ value = of_prop_next_u32(info, NULL, &count);
+ if (value)
+ value++;
+
+ for (i = 0; i < count; i++) {
+ of_read_drc_info_cell(&info, &value, &drc);
+ if (strncmp(drc.drc_type, "CPU", 3))
+ break;
+
+ drc_index = drc.drc_index_start;
+ for (j = 0; j < drc.num_sequential_elems; j++) {
+ if (dlpar_cpu_exists(cpus, drc_index))
+ continue;
+
+ cpu_drcs[cpus_found++] = drc_index;
+
+ if (cpus_found == cpus_to_add)
+ return cpus_found;
+
+ drc_index += drc.sequential_inc;
+ }
}
+ return cpus_found;
+}
+
+static int find_drc_index_cpus_to_add(struct device_node *cpus,
+ u32 *cpu_drcs, u32 cpus_to_add)
+{
+ int cpus_found = 0;
+ int index, rc;
+ u32 drc_index;
+
/* Search the ibm,drc-indexes array for possible CPU drcs to
* add. Note that the format of the ibm,drc-indexes array is
* the number of entries in the array followed by the array
@@ -737,25 +821,25 @@ static int find_dlpar_cpus_to_add(u32 *cpu_drcs, u32 cpus_to_add)
*/
index = 1;
while (cpus_found < cpus_to_add) {
- u32 drc;
+ rc = of_property_read_u32_index(cpus, "ibm,drc-indexes",
+ index++, &drc_index);
- rc = of_property_read_u32_index(parent, "ibm,drc-indexes",
- index++, &drc);
if (rc)
break;
- if (dlpar_cpu_exists(parent, drc))
+ if (dlpar_cpu_exists(cpus, drc_index))
continue;
- cpu_drcs[cpus_found++] = drc;
+ cpu_drcs[cpus_found++] = drc_index;
}
- of_node_put(parent);
return cpus_found;
}
static int dlpar_cpu_add_by_count(u32 cpus_to_add)
{
+ struct device_node *parent;
+ struct property *info;
u32 *cpu_drcs;
int cpus_added = 0;
int cpus_found;
@@ -767,7 +851,21 @@ static int dlpar_cpu_add_by_count(u32 cpus_to_add)
if (!cpu_drcs)
return -EINVAL;
- cpus_found = find_dlpar_cpus_to_add(cpu_drcs, cpus_to_add);
+ parent = of_find_node_by_path("/cpus");
+ if (!parent) {
+ pr_warn("Could not find CPU root node in device tree\n");
+ kfree(cpu_drcs);
+ return -1;
+ }
+
+ info = of_find_property(parent, "ibm,drc-info", NULL);
+ if (info)
+ cpus_found = find_drc_info_cpus_to_add(parent, info, cpu_drcs, cpus_to_add);
+ else
+ cpus_found = find_drc_index_cpus_to_add(parent, cpu_drcs, cpus_to_add);
+
+ of_node_put(parent);
+
if (cpus_found < cpus_to_add) {
pr_warn("Failed to find enough CPUs (%d of %d) to add\n",
cpus_found, cpus_to_add);
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-23 13:16:13 +0000