Subject: [PATCH V4 3/4] hotplug/drc-info: Add code to search ibm,drc-info property
Nathan Fontenot
nfont at linux.vnet.ibm.com
Tue Nov 21 02:38:13 AEDT 2017
On 11/16/2017 02:11 PM, Michael Bringmann wrote:
> rpadlpar_core.c: Provide parallel routines to search the older device-
> tree properties ("ibm,drc-indexes", "ibm,drc-names", "ibm,drc-types"
> and "ibm,drc-power-domains"), or the new property "ibm,drc-info".
>
> The interface to examine the DRC information is changed from a "get"
> function that returns values for local verification elsewhere, to a
> "check" function that validates the 'name' and/or 'type' of a device
> node. This update hides the format of the underlying device-tree
> properties, and concentrates the value checks into a single function
> without requiring the user to verify whether a search was successful.
>
> Signed-off-by: Michael Bringmann <mwb at linux.vnet.ibm.com>
> ---
> Changes in V4:
> -- Rename of_one_drc_info to of_read_drc_info_cell
> -- Fix some spacing within arguments
> ---
> drivers/pci/hotplug/rpadlpar_core.c | 13 ++--
> drivers/pci/hotplug/rpaphp.h | 4 +
> drivers/pci/hotplug/rpaphp_core.c | 110 +++++++++++++++++++++++++++--------
> 3 files changed, 92 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c
> index a3449d7..fc01d7d 100644
> --- a/drivers/pci/hotplug/rpadlpar_core.c
> +++ b/drivers/pci/hotplug/rpadlpar_core.c
> @@ -27,6 +27,7 @@
> #include <linux/mutex.h>
> #include <asm/rtas.h>
> #include <asm/vio.h>
> +#include <linux/firmware.h>
>
> #include "../pci.h"
> #include "rpaphp.h"
> @@ -44,15 +45,14 @@ static struct device_node *find_vio_slot_node(char *drc_name)
> {
> struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
> struct device_node *dn = NULL;
> - char *name;
> int rc;
>
> if (!parent)
> return NULL;
>
> while ((dn = of_get_next_child(parent, dn))) {
> - rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
> - if ((rc == 0) && (!strcmp(drc_name, name)))
> + rc = rpaphp_check_drc_props(dn, drc_name, NULL);
> + if (rc == 0)
> break;
> }
>
> @@ -64,15 +64,12 @@ static struct device_node *find_php_slot_pci_node(char *drc_name,
> char *drc_type)
> {
> struct device_node *np = NULL;
> - char *name;
> - char *type;
> int rc;
>
> while ((np = of_find_node_by_name(np, "pci"))) {
> - rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
> + rc = rpaphp_check_drc_props(np, drc_name, drc_type);
> if (rc == 0)
> - if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
> - break;
> + break;
> }
>
> return np;
> diff --git a/drivers/pci/hotplug/rpaphp.h b/drivers/pci/hotplug/rpaphp.h
> index 7db024e..8db5f2e 100644
> --- a/drivers/pci/hotplug/rpaphp.h
> +++ b/drivers/pci/hotplug/rpaphp.h
> @@ -91,8 +91,8 @@ struct slot {
>
> /* 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);
> +int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
> + char *drc_type);
>
> /* 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 1e29aba..0a3b5f5 100644
> --- a/drivers/pci/hotplug/rpaphp_core.c
> +++ b/drivers/pci/hotplug/rpaphp_core.c
> @@ -30,6 +30,7 @@
> #include <linux/smp.h>
> #include <linux/init.h>
> #include <linux/vmalloc.h>
> +#include <asm/firmware.h>
> #include <asm/eeh.h> /* for eeh_add_device() */
> #include <asm/rtas.h> /* rtas_call */
> #include <asm/pci-bridge.h> /* for pci_controller */
> @@ -196,25 +197,21 @@ static int get_children_props(struct device_node *dn, const int **drc_indexes,
> return 0;
> }
>
> -/* 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.
> +
> +/* Verify the existence of 'drc_name' and/or 'drc_type' within the
> + * current node. First obtain it's my-drc-index property. Next,
> + * obtain the DRC info from it's parent. Use the my-drc-index for
> + * correlation, and obtain/validate 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)
> +
> +static int rpaphp_check_drc_props_v1(struct device_node *dn, char *drc_name,
> + char *drc_type, unsigned int my_index)
> {
> + char *name_tmp, *type_tmp;
> const int *indexes, *names;
> const int *types, *domains;
> - const unsigned int *my_index;
> - char *name_tmp, *type_tmp;
> int i, rc;
>
> - my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
> - if (!my_index) {
> - /* Node isn't DLPAR/hotplug capable */
> - return -EINVAL;
> - }
> -
> rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
> if (rc < 0) {
> return -EINVAL;
> @@ -225,24 +222,87 @@ int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
>
> /* 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;
> - }
> + if ((unsigned int) indexes[i + 1] == my_index)
> + break;
> +
> name_tmp += (strlen(name_tmp) + 1);
> type_tmp += (strlen(type_tmp) + 1);
> }
>
> + if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, name_tmp))) &&
> + ((drc_type == NULL) || (drc_type && !strcmp(drc_type, type_tmp))))
> + return 0;
> +
> + return -EINVAL;
> +}
> +
> +static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name,
> + char *drc_type, unsigned int my_index)
> +{
> + struct property *info;
> + unsigned int entries;
> + struct of_drc_info drc;
> + const __be32 *value;
> + int j;
> +
> + info = of_find_property(dn->parent, "ibm,drc-info", NULL);
> + if (info == NULL)
> + return -EINVAL;
> +
> + value = info->value;
> + value = (void *)of_prop_next_u32(info, value, &entries);
> + if (!value)
> + return -EINVAL;
> +
> + for (j = 0; j < entries; j++) {
> + of_read_drc_info_cell(&info, &value, &drc);
> +
> + /* Should now know end of current entry */
> +
> + WARN_ON((my_index < drc.drc_index_start) ||
> + (((my_index - drc.drc_index_start) %
> + drc.sequential_inc) != 0));
This WARN_ON would also fit better in of_read_drc_info_cell()
-Nathan
> +
> + if (my_index > drc.last_drc_index)
> + continue;
> +
> + break;
> + }
> + /* Found it */
> +
> + if (((drc_name == NULL) ||
> + (drc_name && !strncmp(drc_name,
> + drc.drc_name_prefix,
> + strlen(drc.drc_name_prefix)))) &&
> + ((drc_type == NULL) ||
> + (drc_type && !strncmp(drc_type,
> + drc.drc_type,
> + strlen(drc.drc_type)))))
> + return 0;
> +
> return -EINVAL;
> }
> -EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
> +
> +int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
> + char *drc_type)
> +{
> + const unsigned int *my_index;
> +
> + my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
> + if (!my_index) {
> + /* Node isn't DLPAR/hotplug capable */
> + return -EINVAL;
> + }
> +
> + if (firmware_has_feature(FW_FEATURE_DRC_INFO))
> + return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
> + *my_index);
> + else
> + return rpaphp_check_drc_props_v1(dn, drc_name, drc_type,
> + *my_index);
> +}
> +EXPORT_SYMBOL_GPL(rpaphp_check_drc_props);
> +
>
> static int is_php_type(char *drc_type)
> {
>
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