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From:   Baoquan He <bhe@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, akpm@linux-foundation.org, hch@infradead.org,
        wangkefeng.wang@huawei.com, linux-arm-kernel@lists.infradead.org,
        Baoquan He <bhe@redhat.com>, linux-ia64@vger.kernel.org
Subject: [PATCH 06/11] ia64: mm: Convert to GENERIC_IOREMAP
Date:   Mon,  1 Aug 2022 22:40:24 +0800
Message-Id: <20220801144029.57829-7-bhe@redhat.com>
In-Reply-To: <20220801144029.57829-1-bhe@redhat.com>
References: <20220801144029.57829-1-bhe@redhat.com>
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Add hooks ioremap_allowed() and iounmap_allowed() for ia64's special
operation when ioremap() and iounmap(), then ioremap_cache() is
converted to use ioremap_prot() from GENERIC_IOREMAP.

The old ioremap_uc() is kept and add its macro definittion.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: linux-ia64@vger.kernel.org
---
 arch/ia64/Kconfig          |  1 +
 arch/ia64/include/asm/io.h | 26 ++++++++++++--------
 arch/ia64/mm/ioremap.c     | 50 +++++++++-----------------------------
 3 files changed, 28 insertions(+), 49 deletions(-)

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index cb93769a9f2a..075ffe27dee5 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -46,6 +46,7 @@ config IA64
 	select GENERIC_IRQ_LEGACY
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select GENERIC_IOMAP
+	select GENERIC_IOREMAP
 	select GENERIC_SMP_IDLE_THREAD
 	select ARCH_TASK_STRUCT_ON_STACK
 	select ARCH_TASK_STRUCT_ALLOCATOR
diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 6d93b923b379..a972dc284bbb 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -255,17 +255,23 @@ static inline void outsl(unsigned long port, const void *src,
 
 # ifdef __KERNEL__
 
-extern void __iomem * ioremap(unsigned long offset, unsigned long size);
-extern void __iomem * ioremap_uc(unsigned long offset, unsigned long size);
-extern void iounmap (volatile void __iomem *addr);
-static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned long size)
-{
-	return ioremap(phys_addr, size);
-}
-#define ioremap ioremap
-#define ioremap_cache ioremap_cache
+/*
+ * I/O memory mapping functions.
+ */
+void __iomem *
+ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val);
+#define ioremap_allowed ioremap_allowed
+
+int iounmap_allowed(void *addr);
+#define iounmap_allowed iounmap_allowed
+
+#define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL)
+
+#define ioremap_cache(addr, size)  \
+	ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL))
+
+void __iomem *ioremap_uc(unsigned long offset, unsigned long size);
 #define ioremap_uc ioremap_uc
-#define iounmap iounmap
 
 /*
  * String version of IO memory access ops:
diff --git a/arch/ia64/mm/ioremap.c b/arch/ia64/mm/ioremap.c
index 55fd3eb753ff..75c995e9442f 100644
--- a/arch/ia64/mm/ioremap.c
+++ b/arch/ia64/mm/ioremap.c
@@ -30,15 +30,12 @@ early_ioremap (unsigned long phys_addr, unsigned long size)
 }
 
 void __iomem *
-ioremap (unsigned long phys_addr, unsigned long size)
+ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
 {
-	void __iomem *addr;
-	struct vm_struct *area;
-	unsigned long offset;
-	pgprot_t prot;
-	u64 attr;
+	phys_addr_t phys_addr = *paddr;
 	unsigned long gran_base, gran_size;
 	unsigned long page_base;
+	u64 attr;
 
 	/*
 	 * For things in kern_memmap, we must use the same attribute
@@ -69,35 +66,18 @@ ioremap (unsigned long phys_addr, unsigned long size)
 	page_base = phys_addr & PAGE_MASK;
 	size = PAGE_ALIGN(phys_addr + size) - page_base;
 	if (efi_mem_attribute(page_base, size) & EFI_MEMORY_WB) {
-		prot = PAGE_KERNEL;
-
-		/*
-		 * Mappings have to be page-aligned
-		 */
-		offset = phys_addr & ~PAGE_MASK;
-		phys_addr &= PAGE_MASK;
-
-		/*
-		 * Ok, go for it..
-		 */
-		area = get_vm_area(size, VM_IOREMAP);
-		if (!area)
-			return NULL;
-
-		area->phys_addr = phys_addr;
-		addr = (void __iomem *) area->addr;
-		if (ioremap_page_range((unsigned long) addr,
-				(unsigned long) addr + size, phys_addr, prot)) {
-			vunmap((void __force *) addr);
-			return NULL;
-		}
-
-		return (void __iomem *) (offset + (char __iomem *)addr);
+		return NULL;
 	}
 
 	return __ioremap_uc(phys_addr);
 }
-EXPORT_SYMBOL(ioremap);
+
+int iounmap_allowed(void __iomem *addr)
+{
+	if (REGION_NUMBER(addr) != RGN_GATE)
+		return -EINVAL;
+	return 0;
+}
 
 void __iomem *
 ioremap_uc(unsigned long phys_addr, unsigned long size)
@@ -113,11 +93,3 @@ void
 early_iounmap (volatile void __iomem *addr, unsigned long size)
 {
 }
-
-void
-iounmap (volatile void __iomem *addr)
-{
-	if (REGION_NUMBER(addr) == RGN_GATE)
-		vunmap((void *) ((unsigned long) addr & PAGE_MASK));
-}
-EXPORT_SYMBOL(iounmap);
-- 
2.34.1