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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-05-19 11:04:39 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-06-01 01:15:04 +0100
commit1c8c3cf0b5239388e712508a85821f4718f4d889 (patch)
tree8454ad999882d20118d1af924c0cf6d2d42c97bd
parent437b680a222098f67ecb1690f8eb91f550bfaac8 (diff)
downloadlinux-linaro-stable-1c8c3cf0b5239388e712508a85821f4718f4d889.tar.gz
ARM: 8060/1: mm: allow sub-architectures to override PCI I/O memory type
Due to a design incompatibility between the PCIe Marvell controller and the Cortex-A9, stressing PCIe devices with a lot of traffic quickly causes a deadlock. One part of the workaround for this is to have all PCIe regions mapped as strongly-ordered (MT_UNCACHED) instead of the default MT_DEVICE. While the arch_ioremap_caller() mechanism allows sub-architecture code to override ioremap(), used to map PCIe memory regions, there isn't such a mechanism to override the behavior of pci_ioremap_io(). This commit adds the arch_pci_ioremap_mem_type variable, initialized to MT_DEVICE by default, and that sub-architecture code can override. We have chosen to expose a single variable rather than offering the possibility of overriding the entire pci_ioremap_io(), because implementing pci_ioremap_io() requires calling functions (get_mem_type()) that are private to the arch/arm/mm/ code. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/include/asm/io.h6
-rw-r--r--arch/arm/mm/ioremap.c9
2 files changed, 14 insertions, 1 deletions
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 8aa4cca74501..3d23418cbddd 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -179,6 +179,12 @@ static inline void __iomem *__typesafe_io(unsigned long addr)
/* PCI fixed i/o mapping */
#define PCI_IO_VIRT_BASE 0xfee00000
+#if defined(CONFIG_PCI)
+void pci_ioremap_set_mem_type(int mem_type);
+#else
+static inline void pci_ioremap_set_mem_type(int mem_type) {}
+#endif
+
extern int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr);
/*
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index f9c32ba73544..d1e5ad7ab3bc 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -438,6 +438,13 @@ void __arm_iounmap(volatile void __iomem *io_addr)
EXPORT_SYMBOL(__arm_iounmap);
#ifdef CONFIG_PCI
+static int pci_ioremap_mem_type = MT_DEVICE;
+
+void pci_ioremap_set_mem_type(int mem_type)
+{
+ pci_ioremap_mem_type = mem_type;
+}
+
int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
{
BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT);
@@ -445,7 +452,7 @@ int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
return ioremap_page_range(PCI_IO_VIRT_BASE + offset,
PCI_IO_VIRT_BASE + offset + SZ_64K,
phys_addr,
- __pgprot(get_mem_type(MT_DEVICE)->prot_pte));
+ __pgprot(get_mem_type(pci_ioremap_mem_type)->prot_pte));
}
EXPORT_SYMBOL_GPL(pci_ioremap_io);
#endif