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Violators will be prosecuted for from ; Mon, 20 Nov 2017 08:38:17 -0700 Subject: Re: Subject: [PATCH V4 3/4] hotplug/drc-info: Add code to search ibm,drc-info property To: Michael Bringmann , linuxppc-dev@lists.ozlabs.org References: <6a94bcc7-20c5-98fc-3f17-ab1b9d4385fa@linux.vnet.ibm.com> From: Nathan Fontenot Date: Mon, 20 Nov 2017 09:38:13 -0600 MIME-Version: 1.0 In-Reply-To: <6a94bcc7-20c5-98fc-3f17-ab1b9d4385fa@linux.vnet.ibm.com> Content-Type: text/plain; charset=utf-8 Message-Id: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 > --- > 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 > #include > #include > +#include > > #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 > #include > #include > +#include > #include /* for eeh_add_device() */ > #include /* rtas_call */ > #include /* 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) > { >