linux-kernel - [PATCH 01/26] MIPS: PCI: Support for CONFIG_PCI_DOMAINS

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Date:   Fri, 26 Aug 2016 16:37:00 +0100
From:   Paul Burton <paul.burton@...tec.com>
To:     <linux-mips@...ux-mips.org>, Ralf Baechle <ralf@...ux-mips.org>
CC:     Paul Burton <paul.burton@...tec.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-kernel@...r.kernel.org>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Yinghai Lu <yinghai@...nel.org>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 01/26] MIPS: PCI: Support for CONFIG_PCI_DOMAINS_GENERIC

Introduce support for CONFIG_PCI_DOMAINS_GENERIC, allowing for platforms
to make use of generic PCI domains instead of the MIPS-specific
implementation. The set_pci_need_domain_info function is introduced to
abstract away the removed need_domain_info field in struct
pci_controller, and pcibios_scanbus is adjusted to use the pci_domain_nr
accessor instead of directly accessing the index field.

Signed-off-by: Paul Burton <paul.burton@...tec.com>
---

 arch/mips/Kconfig           |  3 +++
 arch/mips/include/asm/pci.h | 21 ++++++++++++++++++++-
 arch/mips/pci/pci.c         |  4 ++--
 3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 45bbddf..88c0c0d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2980,6 +2980,9 @@ config HT_PCI
 config PCI_DOMAINS
 	bool
 
+config PCI_DOMAINS_GENERIC
+	bool
+
 source "drivers/pci/Kconfig"
 
 #
diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
index 547e113..0564692 100644
--- a/arch/mips/include/asm/pci.h
+++ b/arch/mips/include/asm/pci.h
@@ -39,10 +39,12 @@ struct pci_controller {
 	struct resource *busn_resource;
 	unsigned long busn_offset;
 
+#ifndef CONFIG_PCI_DOMAINS_GENERIC
 	unsigned int index;
 	/* For compatibility with current (as of July 2003) pciutils
 	   and XFree86. Eventually will be removed. */
 	unsigned int need_domain_info;
+#endif
 
 	/* Optional access methods for reading/writing the bus number
 	   of the PCI controller */
@@ -101,7 +103,18 @@ struct pci_dev;
  */
 #define PCI_DMA_BUS_IS_PHYS     (1)
 
-#ifdef CONFIG_PCI_DOMAINS
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+static inline int pci_proc_domain(struct pci_bus *bus)
+{
+	return pci_domain_nr(bus);
+}
+
+static inline void set_pci_need_domain_info(struct pci_controller *hose,
+					    int need_domain_info)
+{
+	/* nothing to do */
+}
+#elif defined(CONFIG_PCI_DOMAINS)
 #define pci_domain_nr(bus) ((struct pci_controller *)(bus)->sysdata)->index
 
 static inline int pci_proc_domain(struct pci_bus *bus)
@@ -109,6 +122,12 @@ static inline int pci_proc_domain(struct pci_bus *bus)
 	struct pci_controller *hose = bus->sysdata;
 	return hose->need_domain_info;
 }
+
+static inline void set_pci_need_domain_info(struct pci_controller *hose,
+					    int need_domain_info)
+{
+	hose->need_domain_info = need_domain_info;
+}
 #endif /* CONFIG_PCI_DOMAINS */
 
 #endif /* __KERNEL__ */
diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
index 644ae96..5207c04 100644
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -95,8 +95,8 @@ static void pcibios_scanbus(struct pci_controller *hose)
 				&resources);
 	hose->bus = bus;
 
-	need_domain_info = need_domain_info || hose->index;
-	hose->need_domain_info = need_domain_info;
+	need_domain_info = need_domain_info || pci_domain_nr(bus);
+	set_pci_need_domain_info(hose, need_domain_info);
 
 	if (!bus) {
 		pci_free_resource_list(&resources);
-- 
2.9.3