linux-kernel - [PATCH v3 16/32] mips: include default ioremap

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Message-Id: <20170411122923.6285-17-lorenzo.pieralisi@arm.com>
Date:   Tue, 11 Apr 2017 13:28:56 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     linux-pci@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Huacai Chen <chenhc@...ote.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v3 16/32] mips: include default ioremap_nopost() implementation

The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and Posting")
mandate non-posted configuration transactions. As further highlighted in
the PCIe specifications (4.0 - Rev0.3, "Ordering Considerations for the
Enhanced Configuration Access Mechanism"), through ECAM and
ECAM-derivative configuration mechanism, the memory mapped transactions
from the host CPU into Configuration Requests on the PCI express fabric
may create ordering problems for software because writes to memory
address are typically posted transactions (unless the architecture can
enforce through virtual address mapping non-posted write transactions
behaviour) but writes to Configuration Space are not posted on the PCI
express fabric.

Include the asm-generic ioremap_nopost() implementation (currently
falling back to ioremap_nocache()) to provide a non-posted writes
ioremap interface to kernel subsystems.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Huacai Chen <chenhc@...ote.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
---
 arch/mips/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index ecabc00..d8d1bae 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -257,6 +257,7 @@ static inline void __iomem * __ioremap_mode(phys_addr_t offset, unsigned long si
 #define ioremap_nocache(offset, size)					\
 	__ioremap_mode((offset), (size), _CACHE_UNCACHED)
 #define ioremap_uc ioremap_nocache
+#include <asm-generic/ioremap-nopost.h>

 /*
  * ioremap_cachable -	map bus memory into CPU space
-- 
2.10.0