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authorWill Deacon <will@kernel.org>2019-07-02 12:53:18 +0100
committerJoerg Roedel <jroedel@suse.de>2019-07-02 17:13:39 +0200
commit900a85ca43f4ae88c325a468cb8827e4852b9141 (patch)
treeed931c69418e9c80e748bb8faca0f11cf9962472
parent3430abd6f403ce43375266798a8571646d15b5cd (diff)
iommu/arm-smmu-v3: Fix compilation when CONFIG_CMA=n
When compiling a kernel without support for CMA, CONFIG_CMA_ALIGNMENT is not defined which results in the following build failure: In file included from ./include/linux/list.h:9:0 from ./include/linux/kobject.h:19, from ./include/linux/of.h:17 from ./include/linux/irqdomain.h:35, from ./include/linux/acpi.h:13, from drivers/iommu/arm-smmu-v3.c:12: drivers/iommu/arm-smmu-v3.c: In function ‘arm_smmu_device_hw_probe’: drivers/iommu/arm-smmu-v3.c:194:40: error: ‘CONFIG_CMA_ALIGNMENT’ undeclared (first use in this function) #define Q_MAX_SZ_SHIFT (PAGE_SHIFT + CONFIG_CMA_ALIGNMENT) Fix the breakage by capping the maximum queue size based on MAX_ORDER when CMA is not enabled. Reported-by: Zhangshaokun <zhangshaokun@hisilicon.com> Signed-off-by: Will Deacon <will@kernel.org> Tested-by: Shaokun Zhang <zhangshaokun@hisilicon.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
-rw-r--r--drivers/iommu/arm-smmu-v3.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 8ff8f61d9e1c..2734beb709e0 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -191,7 +191,13 @@
#define Q_BASE_RWA (1UL << 62)
#define Q_BASE_ADDR_MASK GENMASK_ULL(51, 5)
#define Q_BASE_LOG2SIZE GENMASK(4, 0)
+
+/* Ensure DMA allocations are naturally aligned */
+#ifdef CONFIG_CMA_ALIGNMENT
#define Q_MAX_SZ_SHIFT (PAGE_SHIFT + CONFIG_CMA_ALIGNMENT)
+#else
+#define Q_MAX_SZ_SHIFT (PAGE_SHIFT + MAX_ORDER - 1)
+#endif
/*
* Stream table.