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Subject[PATCH 2/5] dma-mapping: move the dma_coherent flag to struct device
Date
Various architectures support both coherent and non-coherent dma on
a per-device basis. Move the dma_noncoherent flag from mips the
mips archdata field to struct device proper to prepare the
infrastructure for reuse on other architectures.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/mips/Kconfig | 1 +
arch/mips/include/asm/Kbuild | 1 +
arch/mips/include/asm/device.h | 19 ----------------
arch/mips/include/asm/dma-coherence.h | 6 +++++
arch/mips/include/asm/dma-mapping.h | 2 +-
arch/mips/mm/dma-noncoherent.c | 32 +++++----------------------
include/linux/device.h | 7 ++++++
include/linux/dma-noncoherent.h | 18 +++++++++++++++
kernel/dma/Kconfig | 3 +++
9 files changed, 43 insertions(+), 46 deletions(-)
delete mode 100644 arch/mips/include/asm/device.h

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 0b25180028b8..54c52bd0d9d3 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1106,6 +1106,7 @@ config ARCH_SUPPORTS_UPROBES
bool

config DMA_MAYBE_COHERENT
+ select ARCH_HAS_DMA_COHERENCE_H
select DMA_NONCOHERENT
bool

diff --git a/arch/mips/include/asm/Kbuild b/arch/mips/include/asm/Kbuild
index 58351e48421e..9a81e72119da 100644
--- a/arch/mips/include/asm/Kbuild
+++ b/arch/mips/include/asm/Kbuild
@@ -1,6 +1,7 @@
# MIPS headers
generic-(CONFIG_GENERIC_CSUM) += checksum.h
generic-y += current.h
+generic-y += device.h
generic-y += dma-contiguous.h
generic-y += emergency-restart.h
generic-y += export.h
diff --git a/arch/mips/include/asm/device.h b/arch/mips/include/asm/device.h
deleted file mode 100644
index 6aa796f1081a..000000000000
--- a/arch/mips/include/asm/device.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * Arch specific extensions to struct device
- *
- * This file is released under the GPLv2
- */
-#ifndef _ASM_MIPS_DEVICE_H
-#define _ASM_MIPS_DEVICE_H
-
-struct dev_archdata {
-#ifdef CONFIG_DMA_PERDEV_COHERENT
- /* Non-zero if DMA is coherent with CPU caches */
- bool dma_coherent;
-#endif
-};
-
-struct pdev_archdata {
-};
-
-#endif /* _ASM_MIPS_DEVICE_H*/
diff --git a/arch/mips/include/asm/dma-coherence.h b/arch/mips/include/asm/dma-coherence.h
index 8eda48748ed5..876ba0d14cde 100644
--- a/arch/mips/include/asm/dma-coherence.h
+++ b/arch/mips/include/asm/dma-coherence.h
@@ -20,6 +20,12 @@ enum coherent_io_user_state {
#elif defined(CONFIG_DMA_MAYBE_COHERENT)
extern enum coherent_io_user_state coherentio;
extern int hw_coherentio;
+
+static inline int dev_is_dma_coherent(struct device *dev)
+{
+ return coherentio == IO_COHERENCE_ENABLED ||
+ (coherentio == IO_COHERENCE_DEFAULT && hw_coherentio);
+}
#else
#ifdef CONFIG_DMA_NONCOHERENT
#define coherentio IO_COHERENCE_DISABLED
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index e81c4e97ff1a..40d825c779de 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -25,7 +25,7 @@ static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
bool coherent)
{
#ifdef CONFIG_DMA_PERDEV_COHERENT
- dev->archdata.dma_coherent = coherent;
+ dev->dma_coherent = coherent;
#endif
}

diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
index 2aca1236af36..d408ac51f56c 100644
--- a/arch/mips/mm/dma-noncoherent.c
+++ b/arch/mips/mm/dma-noncoherent.c
@@ -14,26 +14,6 @@
#include <asm/dma-coherence.h>
#include <asm/io.h>

-#ifdef CONFIG_DMA_PERDEV_COHERENT
-static inline int dev_is_coherent(struct device *dev)
-{
- return dev->archdata.dma_coherent;
-}
-#else
-static inline int dev_is_coherent(struct device *dev)
-{
- switch (coherentio) {
- default:
- case IO_COHERENCE_DEFAULT:
- return hw_coherentio;
- case IO_COHERENCE_ENABLED:
- return 1;
- case IO_COHERENCE_DISABLED:
- return 0;
- }
-}
-#endif /* CONFIG_DMA_PERDEV_COHERENT */
-
/*
* The affected CPUs below in 'cpu_needs_post_dma_flush()' can speculatively
* fill random cachelines with stale data at any time, requiring an extra
@@ -49,7 +29,7 @@ static inline int dev_is_coherent(struct device *dev)
*/
static inline bool cpu_needs_post_dma_flush(struct device *dev)
{
- if (dev_is_coherent(dev))
+ if (dev_is_dma_coherent(dev))
return false;

switch (boot_cpu_type()) {
@@ -76,7 +56,7 @@ void *arch_dma_alloc(struct device *dev, size_t size,
if (!ret)
return NULL;

- if (!dev_is_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
+ if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
dma_cache_wback_inv((unsigned long) ret, size);
ret = (void *)UNCAC_ADDR(ret);
}
@@ -87,7 +67,7 @@ void *arch_dma_alloc(struct device *dev, size_t size,
void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs)
{
- if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !dev_is_coherent(dev))
+ if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !dev_is_dma_coherent(dev))
cpu_addr = (void *)CAC_ADDR((unsigned long)cpu_addr);
dma_direct_free(dev, size, cpu_addr, dma_addr, attrs);
}
@@ -103,7 +83,7 @@ int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
unsigned long pfn;
int ret = -ENXIO;

- if (!dev_is_coherent(dev))
+ if (!dev_is_dma_coherent(dev))
addr = CAC_ADDR(addr);

pfn = page_to_pfn(virt_to_page((void *)addr));
@@ -187,7 +167,7 @@ static inline void dma_sync_phys(phys_addr_t paddr, size_t size,
void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
size_t size, enum dma_data_direction dir)
{
- if (!dev_is_coherent(dev))
+ if (!dev_is_dma_coherent(dev))
dma_sync_phys(paddr, size, dir);
}

@@ -203,6 +183,6 @@ void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
{
BUG_ON(direction == DMA_NONE);

- if (!dev_is_coherent(dev))
+ if (!dev_is_dma_coherent(dev))
dma_sync_virt(vaddr, size, direction);
}
diff --git a/include/linux/device.h b/include/linux/device.h
index 8f882549edee..983506789402 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -927,6 +927,8 @@ struct dev_links_info {
* @offline: Set after successful invocation of bus type's .offline().
* @of_node_reused: Set if the device-tree node is shared with an ancestor
* device.
+ * @dma_coherent: this particular device is dma coherent, even if the
+ * architecture supports non-coherent devices.
*
* At the lowest level, every device in a Linux system is represented by an
* instance of struct device. The device structure contains the information
@@ -1016,6 +1018,11 @@ struct device {
bool offline_disabled:1;
bool offline:1;
bool of_node_reused:1;
+#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
+ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
+ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
+ bool dma_coherent:1;
+#endif
};

static inline struct device *kobj_to_dev(struct kobject *kobj)
diff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h
index a0aa00cc909d..f99748e9c08e 100644
--- a/include/linux/dma-noncoherent.h
+++ b/include/linux/dma-noncoherent.h
@@ -4,6 +4,24 @@

#include <linux/dma-mapping.h>

+#ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H
+#include <asm/dma-coherence.h>
+#else
+#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
+ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
+ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
+static inline int dev_is_dma_coherent(struct device *dev)
+{
+ return dev->dma_coherent;
+}
+#else
+static inline int dev_is_dma_coherent(struct device *dev)
+{
+ return true;
+}
+#endif
+#endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */
+
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 9bd54304446f..040859ac2a56 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -13,6 +13,9 @@ config NEED_DMA_MAP_STATE
config ARCH_DMA_ADDR_T_64BIT
def_bool 64BIT || PHYS_ADDR_T_64BIT

+config ARCH_HAS_DMA_COHERENCE_H
+ bool
+
config HAVE_GENERIC_DMA_COHERENT
bool

--
2.18.0
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