linux-kernel - [PATCH 06/17] pci: Add generic pcibios_{fixup_bus,align

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Date:   Tue,  6 Jun 2017 15:59:56 -0700
From:   Palmer Dabbelt <palmer@...belt.com>
To:     olof@...om.net
Cc:     Palmer Dabbelt <palmer@...belt.com>
Subject: [PATCH 06/17] pci: Add generic pcibios_{fixup_bus,align_resource}

While upstreaming the RISC-V port, it was pointed out that multiple
architectures (arc, arm64, cris, microblaze, sh, tile) have copied the
mostly empty versions of at least one of these functions.  This defines
weakly bound versions of the common functions so other architetures can
use them.

Signed-off-by: Palmer Dabbelt <palmer@...belt.com>
---
 drivers/pci/Makefile |  2 +-
 drivers/pci/bios.c   | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 drivers/pci/bios.c

diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index a29d9ec05d13..fa7040915194 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -4,7 +4,7 @@
 
 obj-y		+= access.o bus.o probe.o host-bridge.o remove.o pci.o \
 			pci-driver.o search.o pci-sysfs.o rom.o setup-res.o \
-			irq.o vpd.o setup-bus.o vc.o mmap.o
+			irq.o vpd.o setup-bus.o vc.o mmap.o bios.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_SYSFS) += slot.o
 
diff --git a/drivers/pci/bios.c b/drivers/pci/bios.c
new file mode 100644
index 000000000000..ffe34c024aa8
--- /dev/null
+++ b/drivers/pci/bios.c
@@ -0,0 +1,42 @@
+/*
+ * Code borrowed from arch/arm64/kernel/pci.c
+ *   which borrowed from powerpc/kernel/pci-common.c
+ *   which borrowed from arch/alpha/kernel/pci.c
+ *
+ * Extruded from code written by
+ *      Dave Rusling (david.rusling@....mts.dec.com)
+ *      David Mosberger (davidm@...arizona.edu)
+ * Copyright (C) 1999 Andrea Arcangeli <andrea@...e.de>
+ * Copyright (C) 2000 Ivan Kokshaysky <ink@...assic.park.msu.ru>
+ * Copyright (C) 2003 Anton Blanchard <anton@...ibm.com>, IBM
+ * Copyright (C) 2014 ARM Ltd.
+ * Copyright (C) 2017 SiFive
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+/* This file contains weakly bound functions that implement pcibios functions
+ * that some architectures have copied verbatim.
+ */
+
+#include <linux/pci.h>
+
+/*
+ * Called after each bus is probed, but before its children are examined
+ */
+__attribute__ ((weak))
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+       /* nothing to do, expected to be removed in the future */
+}
+/*
+ * We don't have to worry about legacy ISA devices, so nothing to do here
+ */
+__attribute__ ((weak))
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+				       resource_size_t size, resource_size_t align)
+{
+       return res->start;
+}
-- 
2.13.0