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Subject[RFC 3/6] pseries/drcinfo: Pseries impl of arch_find_drc_info
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This patch provides a common interface to parse ibm,drc-indexes,
ibm,drc-names, ibm,drc-types, ibm,drc-power-domains, or ibm,drc-info.
The generic interface arch_find_drc_match is provided which accepts
callback functions that may be applied to examine the data for each
entry.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/prom.h | 3
arch/powerpc/platforms/pseries/of_helpers.c | 299 +++++++++++++++++++++++++++
include/linux/topology.h | 2
3 files changed, 298 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index b04c5ce..910d1dc 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -91,9 +91,6 @@ struct of_drc_info {
u32 last_drc_index;
};

-extern int of_read_drc_info_cell(struct property **prop,
- const __be32 **curval, struct of_drc_info *data);
-

/*
* There are two methods for telling firmware what our capabilities are.
diff --git a/arch/powerpc/platforms/pseries/of_helpers.c b/arch/powerpc/platforms/pseries/of_helpers.c
index 0185e50..11c90cd 100644
--- a/arch/powerpc/platforms/pseries/of_helpers.c
+++ b/arch/powerpc/platforms/pseries/of_helpers.c
@@ -1,5 +1,7 @@
// SPDX-License-Identifier: GPL-2.0

+#define pr_fmt(fmt) "drc: " fmt
+
#include <linux/string.h>
#include <linux/err.h>
#include <linux/slab.h>
@@ -11,6 +13,12 @@

#define MAX_DRC_NAME_LEN 64

+static int drc_debug;
+#define dbg(args...) if (drc_debug) { printk(KERN_DEBUG args); }
+#define err(arg...) printk(KERN_ERR args);
+#define info(arg...) printk(KERN_INFO args);
+#define warn(arg...) printk(KERN_WARNING args);
+
/**
* pseries_of_derive_parent - basically like dirname(1)
* @path: the full_name of a node to be added to the tree
@@ -46,7 +54,8 @@ struct device_node *pseries_of_derive_parent(const char *path)

/* Helper Routines to convert between drc_index to cpu numbers */

-int of_read_drc_info_cell(struct property **prop, const __be32 **curval,
+static int of_read_drc_info_cell(struct property **prop,
+ const __be32 **curval,
struct of_drc_info *data)
{
const char *p;
@@ -90,4 +99,290 @@ int of_read_drc_info_cell(struct property **prop, const __be32 **curval,

return 0;
}
-EXPORT_SYMBOL(of_read_drc_info_cell);
+
+static int walk_drc_info(struct device_node *dn,
+ bool (*usercb)(struct of_drc_info *drc,
+ void *data,
+ int *ret_code),
+ char *opt_drc_type,
+ void *data)
+{
+ struct property *info;
+ unsigned int entries;
+ struct of_drc_info drc;
+ const __be32 *value;
+ int j, ret_code = -EINVAL;
+ bool done = false;
+
+ info = of_find_property(dn, "ibm,drc-info", NULL);
+ if (info == NULL)
+ return -EINVAL;
+
+ value = info->value;
+ entries = of_read_number(value++, 1);
+
+ for (j = 0, done = 0; (j < entries) && (!done); j++) {
+ of_read_drc_info_cell(&info, &value, &drc);
+
+ if (opt_drc_type && strcmp(opt_drc_type, drc.drc_type))
+ continue;
+
+ done = usercb(&drc, data, &ret_code);
+ }
+
+ return ret_code;
+}
+
+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)
+{
+ const int *indexes, *names, *types, *domains;
+
+ 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);
+
+ if (!indexes || !names || !types || !domains) {
+ /* Slot does not have dynamically-removable children */
+ return -EINVAL;
+ }
+ if (drc_indexes)
+ *drc_indexes = indexes;
+ if (drc_names)
+ /* &drc_names[1] contains NULL terminated slot names */
+ *drc_names = names;
+ if (drc_types)
+ /* &drc_types[1] contains NULL terminated slot types */
+ *drc_types = types;
+ if (drc_power_domains)
+ *drc_power_domains = domains;
+
+ return 0;
+}
+
+static int is_php_type(char *drc_type)
+{
+ unsigned long value;
+ char *endptr;
+
+ /* PCI Hotplug nodes have an integer for drc_type */
+ value = simple_strtoul(drc_type, &endptr, 10);
+ if (endptr == drc_type)
+ return 0;
+
+ return 1;
+}
+
+/**
+ * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
+ * @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 int is_php_dn(struct device_node *dn, const int **indexes,
+ const int **names, const int **types,
+ const int **power_domains)
+{
+ const int *drc_types;
+ int rc;
+
+ rc = get_children_props(dn, indexes, names, &drc_types,
+ power_domains);
+ if (rc < 0)
+ return 0;
+
+ if (!is_php_type((char *) &drc_types[1]))
+ return 0;
+
+ *types = drc_types;
+ return 1;
+}
+
+struct find_drc_match_cb_struct {
+ struct device_node *dn;
+ bool (*usercb)(struct device_node *dn,
+ u32 drc_index, char *drc_name,
+ char *drc_type, u32 drc_power_domain,
+ void *data);
+ char *drc_type;
+ char *drc_name;
+ u32 drc_index;
+ bool match_drc_index;
+ bool add_slot;
+ void *data;
+};
+
+static int find_drc_match_v1(struct device_node *dn, void *data)
+{
+ struct find_drc_match_cb_struct *cdata = data;
+ int i, retval = 0;
+ const int *indexes, *names, *types, *domains;
+ char *name, *type;
+ struct device_node *root = dn;
+
+ if (cdata->match_drc_index)
+ root = dn->parent;
+
+ if (cdata->add_slot) {
+ /* If this is not a hotplug slot, return without doing
+ * anything.
+ */
+ if (!is_php_dn(root, &indexes, &names, &types, &domains))
+ return 0;
+ } else {
+ if (get_children_props(root, &indexes, &names, &types,
+ &domains) < 0)
+ return 0;
+ }
+
+ dbg("Entry %s: dn=%pOF\n", __func__, dn);
+
+ name = (char *) &names[1];
+ type = (char *) &types[1];
+ for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
+
+ if (cdata->match_drc_index &&
+ ((unsigned int) indexes[i + 1] != cdata->drc_index)) {
+ name += strlen(name) + 1;
+ type += strlen(type) + 1;
+ continue;
+ }
+
+ if (((cdata->drc_name == NULL) ||
+ (cdata->drc_name && !strcmp(cdata->drc_name, name))) &&
+ ((cdata->drc_type == NULL) ||
+ (cdata->drc_type && !strcmp(cdata->drc_type, type)))) {
+
+ if (cdata->usercb) {
+ retval = cdata->usercb(dn,
+ be32_to_cpu(indexes[i + 1]),
+ name, type,
+ be32_to_cpu(domains[i + 1]),
+ cdata->data);
+ if (!retval)
+ return retval;
+ } else {
+ return 0;
+ }
+ }
+
+ name += strlen(name) + 1;
+ type += strlen(type) + 1;
+ }
+
+ dbg("%s - Exit: rc[%d]\n", __func__, retval);
+
+ /* XXX FIXME: reports a failure only if last entry in loop failed */
+ return retval;
+}
+
+static bool find_drc_match_v2_cb(struct of_drc_info *drc, void *data,
+ int *ret_code)
+{
+ struct find_drc_match_cb_struct *cdata = data;
+ u32 drc_index;
+ char drc_name[MAX_DRC_NAME_LEN];
+ int i, retval;
+
+ (*ret_code) = -EINVAL;
+
+ /* This set not a PHP type? */
+ if (cdata->add_slot) {
+ if (!is_php_type((char *) drc->drc_type)) {
+ return false;
+ }
+ }
+
+ /* Anything to use from this set? */
+ if (cdata->match_drc_index && (cdata->drc_index > drc->last_drc_index))
+ return false;
+ if ((cdata->drc_type && strcmp(cdata->drc_type, drc->drc_type))
+ return false;
+
+ /* Check the drc-index entries of this set */
+ for (i = 0, drc_index = drc->drc_index_start;
+ i < drc->num_sequential_elems; i++, drc_index++) {
+
+ if (cdata->match_drc_index && (cdata->drc_index != drc_index))
+ continue;
+
+ sprintf(drc_name, "%s%d", drc->drc_name_prefix,
+ drc_index - drc->drc_index_start +
+ drc->drc_name_suffix_start);
+
+ if ((cdata->drc_name == NULL) ||
+ (cdata->drc_name && !strcmp(cdata->drc_name, drc_name))) {
+
+ if (cdata->usercb) {
+ retval = cdata->usercb(cdata->dn,
+ drc_index, drc_name,
+ drc->drc_type,
+ drc->drc_power_domain,
+ cdata->data);
+ if (!retval) {
+ (*ret_code) = retval;
+ return true;
+ }
+ } else {
+ (*ret_code) = 0;
+ return true;
+ }
+ }
+ }
+
+ (*ret_code) = retval;
+ return false;
+}
+
+static int find_drc_match_v2(struct device_node *dn, void *data)
+{
+ struct find_drc_match_cb_struct *cdata = data;
+ struct device_node *root = cdata->dn;
+
+ if (!cdata->add_slot) {
+ if (!cdata->drc_type ||
+ (cdata->drc_type && strcmp(cdata->drc_type, "SLOT")))
+ root = dn->parent;
+ }
+
+ return walk_drc_info(root, find_drc_match_v2_cb, NULL, data);
+}
+
+int arch_find_drc_match(struct device_node *dn,
+ bool (*usercb)(struct device_node *dn,
+ u32 drc_index, char *drc_name,
+ char *drc_type, u32 drc_power_domain,
+ void *data),
+ char *opt_drc_type, char *opt_drc_name,
+ bool match_drc_index, bool add_slot,
+ void *data)
+{
+ struct find_drc_match_cb_struct cdata = { dn, usercb,
+ opt_drc_type, opt_drc_name, 0,
+ match_drc_index, add_slot, data };
+
+ if (match_drc_index) {
+ const int *my_index =
+ of_get_property(dn, "ibm,my-drc-index", NULL);
+ if (!my_index) {
+ /* Node isn't DLPAR/hotplug capable */
+ return -EINVAL;
+ }
+ cdata.drc_index = *my_index;
+ }
+
+ if (firmware_has_feature(FW_FEATURE_DRC_INFO))
+ return find_drc_match_v2(dn, &cdata);
+ else
+ return find_drc_match_v1(dn, &cdata);
+}
+EXPORT_SYMBOL(arch_find_drc_match);
diff --git a/include/linux/topology.h b/include/linux/topology.h
index df97f5f..c3dfa53 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -50,7 +50,7 @@ int arch_find_drc_match(struct device_node *dn,
char *drc_type, u32 drc_power_domain,
void *data),
char *opt_drc_type, char *opt_drc_name,
- bool match_drc_index, bool ck_php_type,
+ bool match_drc_index, bool add_slot,
void *data);

/* Conform to ACPI 2.0 SLIT distance definitions */
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