[SRU][N:gke][PATCH 097/106] s390: Implement __iowrite32_copy()

[Tim Whisonant]

From: Jason Gunthorpe <jgg at nvidia.com>

BugLink: https://bugs.launchpad.net/bugs/2117098

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.

Link: https://lore.kernel.org/r/2-v3-1893cd8b9369+1925-mlx5_arm_wc_jgg@nvidia.com
Acked-by: Niklas Schnelle <schnelle at linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
(cherry picked from commit 6ae798cbef4ba1f180aa1a590e33a2d89f7cc34f)
Signed-off-by: Tim Whisonant <tim.whisonant at canonical.com>
---
 arch/s390/include/asm/io.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index 36a9c7740c437..fb647e1065a0b 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -75,6 +75,14 @@ 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>
-- 
2.43.0