From: Tyrel Datwyler <tyr...@linux.vnet.ibm.com>
Older firmwares provided information about Dynamic Reconfig
Connectors (DRC) through several device tree properties, namely
ibm,drc-types, ibm,drc-indexes, ibm,drc-names, and
ibm,drc-power-domains. New firmwares have the ability to present this
same information in a much condensed format through a device tree
property called ibm,drc-info.
The existing cpu DLPAR hotplug code only understands the older DRC
property format when validating the drc-index of a cpu during a
hotplug add. This updates those code paths to use the ibm,drc-info
property, when present, instead for validation.
Signed-off-by: Tyrel Datwyler <tyr...@linux.ibm.com>
---
arch/powerpc/platforms/pseries/hotplug-cpu.c | 101 ++++++++++++++++++++++-----
1 file changed, 85 insertions(+), 16 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c
b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index bbda646..9ba006c 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -407,17 +407,58 @@ 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;
+ 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;
+
+ for (j = 0; j < drc.num_sequential_elems; j++)
+ if (drc_index == (drc.drc_index_start +
(drc.sequential_inc * j)))
+ return true;
+ }
+
+ 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);
+
+ index = 1;
while (!found) {
u32 drc;
rc = of_property_read_u32_index(parent, "ibm,drc-indexes",
index++, &drc);
+
if (rc)
break;
@@ -720,8 +761,11 @@ static int dlpar_cpu_remove_by_count(u32 cpus_to_remove)
static int find_dlpar_cpus_to_add(u32 *cpu_drcs, u32 cpus_to_add)
{
struct device_node *parent;
+ struct property *info;
int cpus_found = 0;
int index, rc;
+ int i, j;
+ u32 drc_index;
parent = of_find_node_by_path("/cpus");
if (!parent) {
@@ -730,24 +774,49 @@ static int find_dlpar_cpus_to_add(u32 *cpu_drcs, u32
cpus_to_add)
return -1;
}
- /* 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
- * of drc values so we start looking at index = 1.
- */
- index = 1;
- while (cpus_found < cpus_to_add) {
- u32 drc;
+ info = of_find_property(parent, "ibm,drc-info", NULL);
+ if (info) {
+ struct of_drc_info drc;
+ const __be32 *value;
+ int count;
- rc = of_property_read_u32_index(parent, "ibm,drc-indexes",
- index++, &drc);
- if (rc)
- break;
+ value = of_prop_next_u32(info, NULL, &count);
+ if (value)
+ value++;
- if (dlpar_cpu_exists(parent, drc))
- continue;
+ for (i = 0; i < count; i++) {
+ of_read_drc_info_cell(&info, &value, &drc);
+ if (strncmp(drc.drc_type, "CPU", 3))
+ break;
+
+ for (j = 0; j < drc.num_sequential_elems && cpus_found
< cpus_to_add; j++) {
+ drc_index = drc.drc_index_start +
(drc.sequential_inc * j);
+
+ if (dlpar_cpu_exists(parent, drc_index))
+ continue;
+
+ cpu_drcs[cpus_found++] = drc_index;
+ }
+ }
+ } else {
+ /* 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
+ * of drc values so we start looking at index = 1.
+ */
+ index = 1;
+ while (cpus_found < cpus_to_add) {
+ rc = of_property_read_u32_index(parent,
"ibm,drc-indexes",
+ index++, &drc_index);
+
+ if (rc)
+ break;
- cpu_drcs[cpus_found++] = drc;
+ if (dlpar_cpu_exists(parent, drc_index))
+ continue;
+
+ cpu_drcs[cpus_found++] = drc_index;
+ }
}
of_node_put(parent);
--
2.7.4
