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Date: Thu, 29 Oct 2020 23:18:21 +0100
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Subject: [patch V2 15/18] io-mapping: Cleanup atomic iomap 
References: <20201029221806.189523375@linutronix.de>
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Cc: Juri Lelli <juri.lelli@redhat.com>, linux-xtensa@linux-xtensa.org,
 Peter Zijlstra <peterz@infradead.org>,
 Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
 Ben Segall <bsegall@google.com>, linux-mm@kvack.org,
 Guo Ren <guoren@kernel.org>, sparclinux@vger.kernel.org,
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 linux-arch@vger.kernel.org, Vincent Guittot <vincent.guittot@linaro.org>,
 Herbert Xu <herbert@gondor.apana.org.au>, x86@kernel.org,
 Russell King <linux@armlinux.org.uk>, linux-csky@vger.kernel.org,
 Christoph Hellwig <hch@lst.de>, David Airlie <airlied@linux.ie>,
 Mel Gorman <mgorman@suse.de>, linux-snps-arc@lists.infradead.org,
 Ard Biesheuvel <ardb@kernel.org>, Paul McKenney <paulmck@kernel.org>,
 linuxppc-dev@lists.ozlabs.org, Steven Rostedt <rostedt@goodmis.org>,
 Linus Torvalds <torvalds@linuxfoundation.org>,
 Greentime Hu <green.hu@gmail.com>, Dietmar Eggemann <dietmar.eggemann@arm.com>,
 linux-arm-kernel@lists.infradead.org, Chris Zankel <chris@zankel.net>,
 Michal Simek <monstr@monstr.eu>,
 Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
 Nick Hu <nickhu@andestech.com>, Max Filippov <jcmvbkbc@gmail.com>,
 Vineet Gupta <vgupta@synopsys.com>, linux-mips@vger.kernel.org,
 Arnd Bergmann <arnd@arndb.de>, Daniel Vetter <daniel@ffwll.ch>,
 Paul Mackerras <paulus@samba.org>, Andrew Morton <akpm@linux-foundation.org>,
 Daniel Bristot de Oliveira <bristot@redhat.com>,
 "David S. Miller" <davem@davemloft.net>
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Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Switch the atomic iomap implementation over to kmap_local and stick the
preempt/pagefault mechanics into the generic code similar to the
kmap_atomic variants.

Rename the x86 map function in preparation for a non-atomic variant.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: New patch to make review easier
---
 arch/x86/include/asm/iomap.h |    9 +--------
 arch/x86/mm/iomap_32.c       |    6 ++----
 include/linux/io-mapping.h   |    8 ++++++--
 3 files changed, 9 insertions(+), 14 deletions(-)

--- a/arch/x86/include/asm/iomap.h
+++ b/arch/x86/include/asm/iomap.h
@@ -13,14 +13,7 @@
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 
-void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot);
-
-static inline void iounmap_atomic(void __iomem *vaddr)
-{
-	kunmap_local_indexed((void __force *)vaddr);
-	pagefault_enable();
-	preempt_enable();
-}
+void __iomem *__iomap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
 
 int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot);
 
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -44,7 +44,7 @@ void iomap_free(resource_size_t base, un
 }
 EXPORT_SYMBOL_GPL(iomap_free);
 
-void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot)
+void __iomem *__iomap_local_pfn_prot(unsigned long pfn, pgprot_t prot)
 {
 	/*
 	 * For non-PAT systems, translate non-WB request to UC- just in
@@ -60,8 +60,6 @@ void __iomem *iomap_atomic_pfn_prot(unsi
 	/* Filter out unsupported __PAGE_KERNEL* bits: */
 	pgprot_val(prot) &= __default_kernel_pte_mask;
 
-	preempt_disable();
-	pagefault_disable();
 	return (void __force __iomem *)__kmap_local_pfn_prot(pfn, prot);
 }
-EXPORT_SYMBOL_GPL(iomap_atomic_pfn_prot);
+EXPORT_SYMBOL_GPL(__iomap_local_pfn_prot);
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -69,13 +69,17 @@ io_mapping_map_atomic_wc(struct io_mappi
 
 	BUG_ON(offset >= mapping->size);
 	phys_addr = mapping->base + offset;
-	return iomap_atomic_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
+	preempt_disable();
+	pagefault_disable();
+	return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
 }
 
 static inline void
 io_mapping_unmap_atomic(void __iomem *vaddr)
 {
-	iounmap_atomic(vaddr);
+	kunmap_local_indexed((void __force *)vaddr);
+	pagefault_enable();
+	preempt_enable();
 }
 
 static inline void __iomem *