[PATCH 5/8] PCI/hotplug/rpa: Create PCI slot properly
Gavin Shan
gwshan at linux.vnet.ibm.com
Tue Nov 25 09:49:22 AEDT 2014
When loading rpaphp.ko on a P7 box, I didn't see any PCI slots
created under /sys/bus/pci/slots as expected. It seems that the
RPA PCI slot stuff has been broken for long time. The driver
doesn't use the properties of PCI device-tree nodes properly to
populate PCI slots: device-tree node property "ibm,my-drc-index"
is the identifier of hotpluggable PCI slot. The (direct or indirect)
parent device-tree node should have properties associated with the
"ibm,my-drc-index", which are "ibm,drc-indexes","ibm,drc-names",
"ibm,drc-types", "ibm,drc-power-domains".
The patch parses above device-tree node properties to create PCI
slots properly. One PCI slot is created for PCI device-tree node,
which has meaningful "ibm,my-drc-index".
Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
drivers/pci/hotplug/rpaphp.h | 2 +-
drivers/pci/hotplug/rpaphp_core.c | 205 ++++++++++++++------------------------
2 files changed, 74 insertions(+), 133 deletions(-)
diff --git a/drivers/pci/hotplug/rpaphp.h b/drivers/pci/hotplug/rpaphp.h
index b2593e8..39ddbdf 100644
--- a/drivers/pci/hotplug/rpaphp.h
+++ b/drivers/pci/hotplug/rpaphp.h
@@ -92,7 +92,7 @@ int rpaphp_get_sensor_state(struct slot *slot, int *state);
/* rpaphp_core.c */
int rpaphp_add_slot(struct device_node *dn);
int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
- char **drc_name, char **drc_type, int *drc_power_domain);
+ char **drc_name, char **drc_type, int *drc_power);
/* rpaphp_slot.c */
void dealloc_slot_struct(struct slot *slot);
diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index ff800df..a639c5c 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -165,119 +165,76 @@ static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
return speed;
}
-static int get_children_props(struct device_node *dn, const int **drc_indexes,
- const int **drc_names, const int **drc_types,
- const int **drc_power_domains)
+static int parse_drc_props(struct device_node *dn, u32 drc_index,
+ char **drc_name, char **drc_type, u32 *drc_power)
{
- const int *indexes, *names, *types, *domains;
+ const u32 *indexes, *names, *types, *domains;
+ char *name, *type;
+ struct device_node *parent = dn;
+ u32 i;
+
+ while ((parent = of_get_parent(parent))) {
+ indexes = of_get_property(parent, "ibm,drc-indexes", NULL);
+ names = of_get_property(parent, "ibm,drc-names", NULL);
+ types = of_get_property(parent, "ibm,drc-types", NULL);
+ domains = of_get_property(parent, "ibm,drc-power-domains", NULL);
+
+ if (!indexes || !names || !types || !domains) {
+ of_node_put(parent);
+ continue;
+ }
- indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
- names = of_get_property(dn, "ibm,drc-names", NULL);
- types = of_get_property(dn, "ibm,drc-types", NULL);
- domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
+ name = (char *)&names[1];
+ type = (char *)&types[1];
+ for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
+ if (be32_to_cpu(indexes[i + 1]) != drc_index) {
+ name += (strlen(name) + 1);
+ type += (strlen(type) + 1);
+ continue;
+ }
- /* Slot does not have dynamically-removable children */
- if (!indexes || !names || !types || !domains)
- return -EINVAL;
+ /* Matched index */
+ if (drc_name)
+ *drc_name = name;
+ if (drc_type)
+ *drc_type = type;
+ if (drc_power)
+ *drc_power = be32_to_cpu(domains[i + 1]);
+
+ of_node_put(parent);
+ return 0;
+ }
- if (drc_indexes)
- *drc_indexes = indexes;
- /* &drc_names[1] contains NULL terminated slot names */
- if (drc_names)
- *drc_names = names;
- /* &drc_types[1] contains NULL terminated slot types */
- if (drc_types)
- *drc_types = types;
- if (drc_power_domains)
- *drc_power_domains = domains;
+ /* Next level parent */
+ of_node_put(parent);
+ }
- return 0;
+ return -ENODEV;
}
-/* To get the DRC props describing the current node, first obtain it's
+/*
+ * To get the DRC props describing the current node, first obtain it's
* my-drc-index property. Next obtain the DRC list from it's parent. Use
* the my-drc-index for correlation, and obtain the requested properties.
*/
int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
- char **drc_name, char **drc_type, int *drc_power_domain)
+ char **drc_name, char **drc_type, int *drc_power)
{
- const int *indexes, *names;
- const int *types, *domains;
- const unsigned int *my_index;
- char *name_tmp, *type_tmp;
- int i, rc;
+ const u32 *my_index;
+ /* Check if node is capable of hotplug */
my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
- /* Node isn't DLPAR/hotplug capable */
if (!my_index)
return -EINVAL;
+ if (drc_index)
+ *drc_index = be32_to_cpu(*my_index);
- rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
- if (rc < 0)
- return -EINVAL;
-
- name_tmp = (char *) &names[1];
- type_tmp = (char *) &types[1];
-
- /* Iterate through parent properties, looking for my-drc-index */
- for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
- if ((unsigned int) indexes[i + 1] == *my_index) {
- if (drc_name)
- *drc_name = name_tmp;
- if (drc_type)
- *drc_type = type_tmp;
- if (drc_index)
- *drc_index = be32_to_cpu(*my_index);
- if (drc_power_domain)
- *drc_power_domain = be32_to_cpu(domains[i+1]);
- return 0;
- }
- name_tmp += (strlen(name_tmp) + 1);
- type_tmp += (strlen(type_tmp) + 1);
- }
-
- return -EINVAL;
+ return parse_drc_props(dn, be32_to_cpu(*my_index),
+ drc_name, drc_type, drc_power);
}
EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
/**
- * is_php_dn() - return true if this is a hotpluggable pci slot, else false
- * @dn: target &device_node
- * @indexes: passed to get_children_props()
- * @names: passed to get_children_props()
- * @types: returned from get_children_props()
- * @power_domains:
- *
- * This routine will return true only if the device node is
- * a hotpluggable slot. This routine will return false
- * for built-in pci slots (even when the built-in slots are
- * dlparable.)
- */
-static bool is_php_dn(struct device_node *dn,
- const int **indexes, const int **names,
- const int **types, const int **power_domains)
-{
- const int *drc_types;
- const char *drc_type_str;
- char *endptr;
- unsigned long val;
- int rc;
-
- rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
- if (rc < 0)
- return false;
-
- /* PCI Hotplug nodes have an integer for drc_type */
- drc_type_str = (char *)&drc_types[1];
- val = simple_strtoul(drc_type_str, &endptr, 10);
- if (endptr == drc_type_str)
- return false;
-
- *types = drc_types;
- return true;
-}
-
-/**
* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
* @dn: device node of slot
*
@@ -295,52 +252,36 @@ static bool is_php_dn(struct device_node *dn,
*/
int rpaphp_add_slot(struct device_node *dn)
{
+ char *name, *type, *endptr;
+ int index, power_domain;
struct slot *slot;
- int retval = 0;
- int i;
- const int *indexes, *names, *types, *power_domains;
- char *name, *type;
-
- if (!dn->name || strcmp(dn->name, "pci"))
- return 0;
+ int val, ret;
- /* If this is not a hotplug slot, return without doing anything. */
- if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
- return 0;
-
- dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
-
- /* register PCI devices */
- name = (char *) &names[1];
- type = (char *) &types[1];
- for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
- int index;
-
- index = be32_to_cpu(indexes[i + 1]);
- slot = alloc_slot_struct(dn, index, name,
- be32_to_cpu(power_domains[i + 1]));
- if (!slot)
- return -ENOMEM;
-
- slot->type = simple_strtoul(type, NULL, 10);
-
- dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
- index, name, type);
+ /* Get and parse the hotplug properties */
+ ret = rpaphp_get_drc_props(dn, &index, &name, &type, &power_domain);
+ if (ret)
+ return ret;
- retval = rpaphp_enable_slot(slot);
- if (!retval)
- retval = rpaphp_register_slot(slot);
+ /* PCI Hotplug nodes have an integer for drc_type */
+ val = simple_strtoul(type, &endptr, 10);
+ if (endptr == type)
+ return -EINVAL;
- if (retval)
- dealloc_slot_struct(slot);
+ slot = alloc_slot_struct(dn, index, name, power_domain);
+ if (!slot)
+ return -ENOMEM;
- name += strlen(name) + 1;
- type += strlen(type) + 1;
- }
- dbg("%s - Exit: rc[%d]\n", __func__, retval);
+ slot->type = val;
+ ret = rpaphp_enable_slot(slot);
+ if (!ret)
+ ret = rpaphp_register_slot(slot);
+ if (ret)
+ goto fail;
- /* XXX FIXME: reports a failure only if last entry in loop failed */
- return retval;
+ return 0;
+fail:
+ dealloc_slot_struct(slot);
+ return ret;
}
EXPORT_SYMBOL_GPL(rpaphp_add_slot);
--
1.8.3.2
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