linux-kernel - [PATCH 4/5] powerpc/pci: Disable filling pci-OF-bus-map for non-chrp/powermac

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Date:   Wed,  6 Jul 2022 12:43:07 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Cédric Le Goater <clg@...d.org>,
        Nick Child <nick.child@....com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] powerpc/pci: Disable filling pci-OF-bus-map for non-chrp/powermac

Creating or filling pci-OF-bus-map property in the device-tree is
deprecated since May 2006 [1] and was used only in old platforms like
PowerMac.

Currently kernel code handles it only for chrp and powermac code. So
completely disable filling pci-OF-bus-map property for non-chrp and
non-powermac platforms.

[1] - https://lore.kernel.org/linuxppc-dev/1148016268.13249.14.camel@localhost.localdomain/

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 arch/powerpc/kernel/pci_32.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/pci_32.c b/arch/powerpc/kernel/pci_32.c
index 3291af89cea4..2f7284b68f06 100644
--- a/arch/powerpc/kernel/pci_32.c
+++ b/arch/powerpc/kernel/pci_32.c
@@ -37,15 +37,12 @@ EXPORT_SYMBOL(isa_io_base);
 EXPORT_SYMBOL(pci_dram_offset);
 
 static void fixup_cpc710_pci64(struct pci_dev* dev);
-static u8* pci_to_OF_bus_map;
 
 /* By default, we don't re-assign bus numbers. We do this only on
  * some pmacs
  */
 static int pci_assign_all_buses;
 
-static int pci_bus_count;
-
 /* This will remain NULL for now, until isa-bridge.c is made common
  * to both 32-bit and 64-bit.
  */
@@ -65,6 +62,11 @@ fixup_cpc710_pci64(struct pci_dev* dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);
 
+#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)
+
+static u8* pci_to_OF_bus_map;
+static int pci_bus_count;
+
 /*
  * Functions below are used on OpenFirmware machines.
  */
@@ -221,6 +223,8 @@ pci_create_OF_bus_map(void)
 }
 #endif
 
+#endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) */
+
 void pcibios_setup_phb_io_space(struct pci_controller *hose)
 {
 	unsigned long io_offset;
@@ -252,6 +256,8 @@ static int __init pcibios_init(void)
 		if (pci_assign_all_buses || next_busno <= hose->last_busno)
 			next_busno = hose->last_busno + pcibios_assign_bus_offset;
 	}
+
+#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)
 	pci_bus_count = next_busno;
 
 	/* OpenFirmware based machines need a map of OF bus
@@ -260,6 +266,7 @@ static int __init pcibios_init(void)
 	 */
 	if (pci_assign_all_buses)
 		pcibios_make_OF_bus_map();
+#endif
 
 	/* Call common code to handle resource allocation */
 	pcibios_resource_survey();
-- 
2.20.1