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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-05-15 11:02:43 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-05-17 11:52:11 +0100
commit47ab0dee661dbd5aca67abe44a333e471134fbf9 (patch)
tree6464acf6eb3cd42102fa70e160335626354edfc1
parent8c0b742ca7a7d21de0ddc87eda6ef0b282e4de18 (diff)
ARM: Optionally allow ARMv6 to use 'normal, bufferable' memory for DMA
Provide a configuration option to allow the ARMv6 to use normal bufferable memory for coherent DMA. This option is forced to 'y' for ARMv7, and offered as a configuration option on ARMv6. Enabling this option requires drivers to have the necessary barriers to ensure that data in DMA coherent memory is visible prior to the DMA operation commencing. Reviewed-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/pgtable.h2
-rw-r--r--arch/arm/include/asm/system.h2
-rw-r--r--arch/arm/mm/Kconfig19
3 files changed, 21 insertions, 2 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 11397687f42..ab68cf1ef80 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -314,7 +314,7 @@ static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
__pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
#define pgprot_writecombine(prot) \
__pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE)
-#if __LINUX_ARM_ARCH__ >= 7
+#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
#define pgprot_dmacoherent(prot) \
__pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_BUFFERABLE)
#else
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index ca88e6a8470..02f5d99adbc 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -137,7 +137,7 @@ extern unsigned int user_debug;
#define dmb() __asm__ __volatile__ ("" : : : "memory")
#endif
-#if __LINUX_ARM_ARCH__ >= 7 || defined(CONFIG_SMP)
+#if defined(CONFIG_ARM_DMA_MEM_BUFFERABLE) || defined(CONFIG_SMP)
#define mb() dmb()
#define rmb() dmb()
#define wmb() dmb()
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index c4ed9f93f64..573528d9c6d 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -781,3 +781,22 @@ config ARM_L1_CACHE_SHIFT
int
default 6 if ARM_L1_CACHE_SHIFT_6
default 5
+
+config ARM_DMA_MEM_BUFFERABLE
+ bool "Use non-cacheable memory for DMA" if CPU_V6 && !CPU_V7
+ default y if CPU_V6 || CPU_V7
+ help
+ Historically, the kernel has used strongly ordered mappings to
+ provide DMA coherent memory. With the advent of ARMv7, mapping
+ memory with differing types results in unpredictable behaviour,
+ so on these CPUs, this option is forced on.
+
+ Multiple mappings with differing attributes is also unpredictable
+ on ARMv6 CPUs, but since they do not have aggressive speculative
+ prefetch, no harm appears to occur.
+
+ However, drivers may be missing the necessary barriers for ARMv6,
+ and therefore turning this on may result in unpredictable driver
+ behaviour. Therefore, we offer this as an option.
+
+ You are recommended say 'Y' here and debug any affected drivers.