dma-mapping, powerpc: simplify the arch dma_set_mask override

Instead of letting the architecture supply all of dma_set_mask just
give it an additional hook selected by Kconfig.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b238c63..39d07c0 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -886,6 +886,7 @@ config FSL_SOC
 
 config FSL_PCI
        bool
+       select ARCH_HAS_DMA_SET_MASK
        select PPC_INDIRECT_PCI
        select PCI_QUIRKS
 

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index dc7f7bc..16d4551 100644 (file)
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -110,7 +110,5 @@ static inline void set_dma_offset(struct device *dev, dma_addr_t off)
                dev->archdata.dma_offset = off;
 }
 
-#define HAVE_ARCH_DMA_SET_MASK 1
-
 #endif /* __KERNEL__ */
 #endif /* _ASM_DMA_MAPPING_H */

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 7b70dcb..2f0ca65 100644 (file)
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -47,7 +47,7 @@ struct machdep_calls {
 #endif
 #endif /* CONFIG_PPC64 */
 
-       int             (*dma_set_mask)(struct device *dev, u64 dma_mask);
+       void            (*dma_set_mask)(struct device *dev, u64 dma_mask);
 
        int             (*probe)(void);
        void            (*setup_arch)(void); /* Optional, may be NULL */

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index cb7f0bb..9bb12cd 100644 (file)
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -105,6 +105,7 @@ obj-$(CONFIG_UPROBES)               += uprobes.o
 obj-$(CONFIG_PPC_UDBG_16550)   += legacy_serial.o udbg_16550.o
 obj-$(CONFIG_STACKTRACE)       += stacktrace.o
 obj-$(CONFIG_SWIOTLB)          += dma-swiotlb.o
+obj-$(CONFIG_ARCH_HAS_DMA_SET_MASK) += dma-mask.o
 
 pci64-$(CONFIG_PPC64)          += pci_dn.o pci-hotplug.o isa-bridge.o
 obj-$(CONFIG_PCI)              += pci_$(BITS).o $(pci64-y) \

diff --git a/arch/powerpc/kernel/dma-mask.c b/arch/powerpc/kernel/dma-mask.c
new file mode 100644 (file)
index 0000000..ffbbbc4
--- /dev/null
+++ b/arch/powerpc/kernel/dma-mask.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/dma-mapping.h>
+#include <linux/export.h>
+#include <asm/machdep.h>
+
+void arch_dma_set_mask(struct device *dev, u64 dma_mask)
+{
+       if (ppc_md.dma_set_mask)
+               ppc_md.dma_set_mask(dev, dma_mask);
+}
+EXPORT_SYMBOL(arch_dma_set_mask);

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 1e191eb..e422ca6 100644 (file)
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -234,18 +234,6 @@ const struct dma_map_ops dma_nommu_ops = {
 };
 EXPORT_SYMBOL(dma_nommu_ops);
 
-int dma_set_mask(struct device *dev, u64 dma_mask)
-{
-       if (ppc_md.dma_set_mask)
-               return ppc_md.dma_set_mask(dev, dma_mask);
-
-       if (!dev->dma_mask || !dma_supported(dev, dma_mask))
-               return -EIO;
-       *dev->dma_mask = dma_mask;
-       return 0;
-}
-EXPORT_SYMBOL(dma_set_mask);
-
 static int __init dma_init(void)
 {
 #ifdef CONFIG_IBMVIO

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index b710cee..0c6510f 100644 (file)
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -133,11 +133,8 @@ static void setup_swiotlb_ops(struct pci_controller *hose)
 static inline void setup_swiotlb_ops(struct pci_controller *hose) {}
 #endif
 
-static int fsl_pci_dma_set_mask(struct device *dev, u64 dma_mask)
+static void fsl_pci_dma_set_mask(struct device *dev, u64 dma_mask)
 {
-       if (!dev->dma_mask || !dma_supported(dev, dma_mask))
-               return -EIO;
-
        /*
         * Fix up PCI devices that are able to DMA to the large inbound
         * mapping that allows addressing any RAM address from across PCI.
@@ -147,9 +144,6 @@ static int fsl_pci_dma_set_mask(struct device *dev, u64 dma_mask)
                set_dma_ops(dev, &dma_nommu_ops);
                set_dma_offset(dev, pci64_dma_offset);
        }
-
-       *dev->dma_mask = dma_mask;
-       return 0;
 }
 
 static int setup_one_atmu(struct ccsr_pci __iomem *pci,

diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index ca88b86..0711d18 100644 (file)
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -16,6 +16,9 @@ config ARCH_DMA_ADDR_T_64BIT
 config ARCH_HAS_DMA_COHERENCE_H
        bool
 
+config ARCH_HAS_DMA_SET_MASK
+       bool
+
 config HAVE_GENERIC_DMA_COHERENT
        bool
 

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 40c0af7..ef2aba5 100644 (file)
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -316,18 +316,23 @@ int dma_supported(struct device *dev, u64 mask)
 }
 EXPORT_SYMBOL(dma_supported);
 
-#ifndef HAVE_ARCH_DMA_SET_MASK
+#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
+void arch_dma_set_mask(struct device *dev, u64 mask);
+#else
+#define arch_dma_set_mask(dev, mask)   do { } while (0)
+#endif
+
 int dma_set_mask(struct device *dev, u64 mask)
 {
        if (!dev->dma_mask || !dma_supported(dev, mask))
                return -EIO;
 
+       arch_dma_set_mask(dev, mask);
        dma_check_mask(dev, mask);
        *dev->dma_mask = mask;
        return 0;
 }
 EXPORT_SYMBOL(dma_set_mask);
-#endif
 
 #ifndef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 int dma_set_coherent_mask(struct device *dev, u64 mask)