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[2/6] s390: Implement __iowrite32_copy()

Message ID 2-v1-38290193eace+5-mlx5_arm_wc_jgg@nvidia.com (mailing list archive)
State Not Applicable
Headers show
Series Fix mlx5 write combining support on new ARM64 cores | expand

Checks

Context Check Description
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Jason Gunthorpe Feb. 21, 2024, 1:17 a.m. UTC 
It is trivial to implement an inline to do this, so provide it in the s390
headers. Like the 64 bit version it should just invoke zpci_memcpy_toio()
with the correct size.

Acked-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 arch/s390/include/asm/io.h | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index 4453ad7c11aced..00704fc8a54b30 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -73,6 +73,14 @@  static inline void ioport_unmap(void __iomem *p)
 #define __raw_writel	zpci_write_u32
 #define __raw_writeq	zpci_write_u64
 
+/* combine single writes by using store-block insn */
+static inline void __iowrite32_copy(void __iomem *to, const void *from,
+				    size_t count)
+{
+	zpci_memcpy_toio(to, from, count * 4);
+}
+#define __iowrite32_copy __iowrite32_copy
+
 #endif /* CONFIG_PCI */
 
 #include <asm-generic/io.h>