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PCI: rpaphp: Add drc-info support for hotplug slot registration

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Split physical PCI slot registration scanning into separate routines
that support the old ibm,drc-* properties and one that supports the
new compressed ibm,drc-info property.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1573449697-5448-7-git-send-email-tyreld@linux.ibm.com
This commit is contained in:
Tyrel Datwyler 2019-11-10 23:21:33 -06:00 committed by Michael Ellerman
parent 52e2b0f165
commit efeda8fada
1 changed files with 69 additions and 20 deletions
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89
drivers/pci/hotplug/rpaphp_core.c
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@ -328,23 +328,48 @@ static int is_php_dn(struct device_node *dn, const int **indexes,
return 1;
}
/**
* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
* @dn: device node of slot
*
* This subroutine will register a hotpluggable slot with the
* PCI hotplug infrastructure. This routine is typically called
* during boot time, if the hotplug slots are present at boot time,
* or is called later, by the dlpar add code, if the slot is
* being dynamically added during runtime.
*
* If the device node points at an embedded (built-in) slot, this
* routine will just return without doing anything, since embedded
* slots cannot be hotplugged.
*
* To remove a slot, it suffices to call rpaphp_deregister_slot().
*/
int rpaphp_add_slot(struct device_node *dn)
static int rpaphp_drc_info_add_slot(struct device_node *dn)
{
struct slot *slot;
struct property *info;
struct of_drc_info drc;
char drc_name[MAX_DRC_NAME_LEN];
const __be32 *cur;
u32 count;
int retval = 0;
info = of_find_property(dn, "ibm,drc-info", NULL);
if (!info)
return 0;
cur = of_prop_next_u32(info, NULL, &count);
if (cur)
cur++;
else
return 0;
of_read_drc_info_cell(&info, &cur, &drc);
if (!is_php_type(drc.drc_type))
return 0;
sprintf(drc_name, "%s%d", drc.drc_name_prefix, drc.drc_name_suffix_start);
slot = alloc_slot_struct(dn, drc.drc_index_start, drc_name, drc.drc_power_domain);
if (!slot)
return -ENOMEM;
slot->type = simple_strtoul(drc.drc_type, NULL, 10);
retval = rpaphp_enable_slot(slot);
if (!retval)
retval = rpaphp_register_slot(slot);
if (retval)
dealloc_slot_struct(slot);
return retval;
}
static int rpaphp_drc_add_slot(struct device_node *dn)
{
struct slot *slot;
int retval = 0;
@ -352,9 +377,6 @@ int rpaphp_add_slot(struct device_node *dn)
const int *indexes, *names, *types, *power_domains;
char *name, *type;
if (!dn->name || strcmp(dn->name, "pci"))
return 0;
/* If this is not a hotplug slot, return without doing anything. */
if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
return 0;
@ -393,6 +415,33 @@ int rpaphp_add_slot(struct device_node *dn)
/* XXX FIXME: reports a failure only if last entry in loop failed */
return retval;
}
/**
* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
* @dn: device node of slot
*
* This subroutine will register a hotpluggable slot with the
* PCI hotplug infrastructure. This routine is typically called
* during boot time, if the hotplug slots are present at boot time,
* or is called later, by the dlpar add code, if the slot is
* being dynamically added during runtime.
*
* If the device node points at an embedded (built-in) slot, this
* routine will just return without doing anything, since embedded
* slots cannot be hotplugged.
*
* To remove a slot, it suffices to call rpaphp_deregister_slot().
*/
int rpaphp_add_slot(struct device_node *dn)
{
if (!dn->name || strcmp(dn->name, "pci"))
return 0;
if (of_find_property(dn, "ibm,drc-info", NULL))
return rpaphp_drc_info_add_slot(dn);
else
return rpaphp_drc_add_slot(dn);
}
EXPORT_SYMBOL_GPL(rpaphp_add_slot);
static void __exit cleanup_slots(void)