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SubjectRe: [RFC 3/6] pseries/drcinfo: Pseries impl of arch_find_drc_info
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On 12/14/2018 12:51 PM, Michael Bringmann wrote:
> 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.
>

The title of your patch is "pseries/drcinfo: Pseries impl of arch_find_drc_info"
but the name of the function you are ultimately implementing is
arch_find_drc_match if I'm not mistaken.

> 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);

Its pretty standard these days to use the pr_debug, pr_err, pr_info, pr_warn
variations over printk(LEVEL 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);

Why are you making a change to the prototype here? You should just define it in
your first patch instead of touching it again here.

-Tyrel

>
> /* Conform to ACPI 2.0 SLIT distance definitions */
>

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