netdev - [PATCH 2/6] s390: Implement __iowrite32

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Message-ID: <2-v1-38290193eace+5-mlx5_arm_wc_jgg@nvidia.com>
Date: Tue, 20 Feb 2024 21:17:06 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Leon Romanovsky <leon@...nel.org>,
	linux-rdma@...r.kernel.org,
	linux-s390@...r.kernel.org,
	llvm@...ts.linux.dev,
	Ingo Molnar <mingo@...hat.com>,
	Bill Wendling <morbo@...gle.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Salil Mehta <salil.mehta@...wei.com>,
	Jijie Shao <shaojijie@...wei.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	x86@...nel.org,
	Yisen Zhuang <yisen.zhuang@...wei.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Leon Romanovsky <leonro@...lanox.com>,
	linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	Michael Guralnik <michaelgur@...lanox.com>,
	patches@...ts.linux.dev,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Will Deacon <will@...nel.org>
Subject: [PATCH 2/6] s390: Implement __iowrite32_copy()

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@...ux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.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 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>
-- 
2.43.2