linux-kernel - [RFC 1/6] powerpc:/drc Define interface to acquire arch-specific drc info

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Date:   Fri, 14 Dec 2018 14:50:26 -0600
From:   Michael Bringmann <mwb@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Juliet Kim <minkim@...ibm.com>,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>,
        Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Subject: [RFC 1/6] powerpc:/drc Define interface to acquire arch-specific
 drc info

Define interface to acquire arch-specific drc info to match against
hotpluggable devices.  The current implementation exposes several
pseries-specific dynamic memory properties in generic kernel code.
This patch set provides an interface to pull that code out of the
generic kernel.

Signed-off-by: Michael Bringmann <mwb@...ux.vnet.ibm.com>
---
 include/linux/topology.h |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/topology.h b/include/linux/topology.h
index cb0775e..df97f5f 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -44,6 +44,15 @@
 
 int arch_update_cpu_topology(void);
 
+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 ck_php_type,
+			void *data);
+
 /* Conform to ACPI 2.0 SLIT distance definitions */
 #define LOCAL_DISTANCE		10
 #define REMOTE_DISTANCE		20