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authorTiezhu Yang <yangtiezhu@loongson.cn>2021-12-08 10:27:19 +0100
committerThomas Bogendoerfer <tsbogend@alpha.franken.de>2021-12-09 10:22:24 +0100
commit09d97da660ff77df20984496aa0abcd6b88819f2 (patch)
treef3bba8fec115fc731aa73d76653ac6e517b0689a /arch/mips
parentLinux 5.16-rc3 (diff)
downloadlinux-09d97da660ff77df20984496aa0abcd6b88819f2.tar.xz
linux-09d97da660ff77df20984496aa0abcd6b88819f2.zip
MIPS: Only define pci_remap_iospace() for Ralink
After commit 9f76779f2418 ("MIPS: implement architecture-specific 'pci_remap_iospace()'"), there exists the following warning on the Loongson64 platform: loongson-pci 1a000000.pci: IO 0x0018020000..0x001803ffff -> 0x0000020000 loongson-pci 1a000000.pci: MEM 0x0040000000..0x007fffffff -> 0x0040000000 ------------[ cut here ]------------ WARNING: CPU: 2 PID: 1 at arch/mips/pci/pci-generic.c:55 pci_remap_iospace+0x84/0x90 resource start address is not zero ... Call Trace: [<ffffffff8020dc78>] show_stack+0x40/0x120 [<ffffffff80cf4a0c>] dump_stack_lvl+0x58/0x74 [<ffffffff8023a0b0>] __warn+0xe0/0x110 [<ffffffff80cee02c>] warn_slowpath_fmt+0xa4/0xd0 [<ffffffff80cecf24>] pci_remap_iospace+0x84/0x90 [<ffffffff807f9864>] devm_pci_remap_iospace+0x5c/0xb8 [<ffffffff808121b0>] devm_of_pci_bridge_init+0x178/0x1f8 [<ffffffff807f4000>] devm_pci_alloc_host_bridge+0x78/0x98 [<ffffffff80819454>] loongson_pci_probe+0x34/0x160 [<ffffffff809203cc>] platform_probe+0x6c/0xe0 [<ffffffff8091d5d4>] really_probe+0xbc/0x340 [<ffffffff8091d8f0>] __driver_probe_device+0x98/0x110 [<ffffffff8091d9b8>] driver_probe_device+0x50/0x118 [<ffffffff8091dea0>] __driver_attach+0x80/0x118 [<ffffffff8091b280>] bus_for_each_dev+0x80/0xc8 [<ffffffff8091c6d8>] bus_add_driver+0x130/0x210 [<ffffffff8091ead4>] driver_register+0x8c/0x150 [<ffffffff80200a8c>] do_one_initcall+0x54/0x288 [<ffffffff811a5320>] kernel_init_freeable+0x27c/0x2e4 [<ffffffff80cfc380>] kernel_init+0x2c/0x134 [<ffffffff80205a2c>] ret_from_kernel_thread+0x14/0x1c ---[ end trace e4a0efe10aa5cce6 ]--- loongson-pci 1a000000.pci: error -19: failed to map resource [io 0x20000-0x3ffff] We can see that the resource start address is 0x0000020000, because the ISA Bridge used the zero address which is defined in the dts file arch/mips/boot/dts/loongson/ls7a-pch.dtsi: ISA Bridge: /bus@10000000/isa@18000000 IO 0x0000000018000000..0x000000001801ffff -> 0x0000000000000000 Based on the above analysis, the architecture-specific pci_remap_iospace() is not suitable for Loongson64, we should only define pci_remap_iospace() for Ralink on MIPS based on the commit background. Fixes: 9f76779f2418 ("MIPS: implement architecture-specific 'pci_remap_iospace()'") Suggested-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Tested-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/include/asm/mach-ralink/spaces.h2
-rw-r--r--arch/mips/include/asm/pci.h4
-rw-r--r--arch/mips/pci/pci-generic.c2
3 files changed, 4 insertions, 4 deletions
diff --git a/arch/mips/include/asm/mach-ralink/spaces.h b/arch/mips/include/asm/mach-ralink/spaces.h
index 05d14c21c417..f7af11ea2d61 100644
--- a/arch/mips/include/asm/mach-ralink/spaces.h
+++ b/arch/mips/include/asm/mach-ralink/spaces.h
@@ -6,5 +6,7 @@
#define PCI_IOSIZE SZ_64K
#define IO_SPACE_LIMIT (PCI_IOSIZE - 1)
+#define pci_remap_iospace pci_remap_iospace
+
#include <asm/mach-generic/spaces.h>
#endif
diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
index 421231f55935..9ffc8192adae 100644
--- a/arch/mips/include/asm/pci.h
+++ b/arch/mips/include/asm/pci.h
@@ -20,10 +20,6 @@
#include <linux/list.h>
#include <linux/of.h>
-#ifdef CONFIG_PCI_DRIVERS_GENERIC
-#define pci_remap_iospace pci_remap_iospace
-#endif
-
#ifdef CONFIG_PCI_DRIVERS_LEGACY
/*
diff --git a/arch/mips/pci/pci-generic.c b/arch/mips/pci/pci-generic.c
index 18eb8a453a86..d2d68bac3d25 100644
--- a/arch/mips/pci/pci-generic.c
+++ b/arch/mips/pci/pci-generic.c
@@ -47,6 +47,7 @@ void pcibios_fixup_bus(struct pci_bus *bus)
pci_read_bridge_bases(bus);
}
+#ifdef pci_remap_iospace
int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
{
unsigned long vaddr;
@@ -60,3 +61,4 @@ int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
set_io_port_base(vaddr);
return 0;
}
+#endif