linux-kernel - [PATCH v4 10/15] asm/io.h: Add ioremap

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Date:   Wed,  4 Aug 2021 17:52:13 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Richard Henderson <rth@...ddle.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        James E J Bottomley <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        "Michael S . Tsirkin" <mst@...hat.com>
Cc:     Peter H Anvin <hpa@...or.com>, Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-alpha@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH v4 10/15] asm/io.h: Add ioremap_shared fallback

From: Andi Kleen <ak@...ux.intel.com>

This function is for declaring memory that should be shared with
a hypervisor in a confidential guest. If the architecture doesn't
implement it it's just ioremap.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
 arch/alpha/include/asm/io.h    | 1 +
 arch/mips/include/asm/io.h     | 1 +
 arch/parisc/include/asm/io.h   | 1 +
 arch/sparc/include/asm/io_64.h | 1 +
 include/asm-generic/io.h       | 4 ++++
 5 files changed, 8 insertions(+)

diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
index 0fab5ac90775..701b44909b94 100644
--- a/arch/alpha/include/asm/io.h
+++ b/arch/alpha/include/asm/io.h
@@ -283,6 +283,7 @@ static inline void __iomem *ioremap(unsigned long port, unsigned long size)
 }
 
 #define ioremap_wc ioremap
+#define ioremap_shared ioremap
 #define ioremap_uc ioremap
 
 static inline void iounmap(volatile void __iomem *addr)
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 6f5c86d2bab4..3713ff624632 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -179,6 +179,7 @@ void iounmap(const volatile void __iomem *addr);
 #define ioremap(offset, size)						\
 	ioremap_prot((offset), (size), _CACHE_UNCACHED)
 #define ioremap_uc		ioremap
+#define ioremap_shared		ioremap
 
 /*
  * ioremap_cache -	map bus memory into CPU space
diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h
index 0b5259102319..73064e152df7 100644
--- a/arch/parisc/include/asm/io.h
+++ b/arch/parisc/include/asm/io.h
@@ -129,6 +129,7 @@ static inline void gsc_writeq(unsigned long long val, unsigned long addr)
  */
 void __iomem *ioremap(unsigned long offset, unsigned long size);
 #define ioremap_wc			ioremap
+#define ioremap_shared			ioremap
 #define ioremap_uc			ioremap
 
 extern void iounmap(const volatile void __iomem *addr);
diff --git a/arch/sparc/include/asm/io_64.h b/arch/sparc/include/asm/io_64.h
index 5ffa820dcd4d..18cc656eb712 100644
--- a/arch/sparc/include/asm/io_64.h
+++ b/arch/sparc/include/asm/io_64.h
@@ -409,6 +409,7 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
 #define ioremap_uc(X,Y)			ioremap((X),(Y))
 #define ioremap_wc(X,Y)			ioremap((X),(Y))
 #define ioremap_wt(X,Y)			ioremap((X),(Y))
+#define ioremap_shared(X, Y)		ioremap((X), (Y))
 static inline void __iomem *ioremap_np(unsigned long offset, unsigned long size)
 {
 	return NULL;
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index e93375c710b9..bfcaee1691c8 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -982,6 +982,10 @@ static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
 #define ioremap_wt ioremap
 #endif
 
+#ifndef ioremap_shared
+#define ioremap_shared ioremap
+#endif
+
 /*
  * ioremap_uc is special in that we do require an explicit architecture
  * implementation.  In general you do not want to use this function in a
-- 
2.25.1