[PATCH 03/21] sparc32: flush caches in dma_sync_*for_device

Arnd Bergmann
2023-03-27T12:14:45Z

From: Arnd Bergmann <arnd@arndb.de>

Leon has a very minimalistic cache that has no range operations
and requires being flushed entirely to deal with noncoherent
DMA. Most in-order architectures do their cache management in
the dma_sync_*for_device() operations rather than dma_sync_*for_cpu.

Since the cache is write-through only, both should have the same
effect, so change it for consistency with the other architectures.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/sparc/Kconfig | 2 +-
arch/sparc/kernel/ioport.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 84437a4c6545..637da50e236c 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -51,7 +51,7 @@ config SPARC
config SPARC32
def_bool !64BIT
select ARCH_32BIT_OFF_T
- select ARCH_HAS_SYNC_DMA_FOR_CPU
+ select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select CLZ_TAB
select DMA_DIRECT_REMAP
select GENERIC_ATOMIC64
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 4e4f3d3263e4..4f3d26066ec2 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -306,7 +306,7 @@ arch_initcall(sparc_register_ioport);
* On LEON systems without cache snooping, the entire D-CACHE must be flushed to
* make DMA to cacheable memory coherent.
*/
-void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
if (dir != DMA_TO_DEVICE &&
--
2.39.2