linux-kernel - [PATCH v6 15/19] mm/ioremap: Consider IOREMAP space in generic ioremap

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Date:   Fri,  9 Jun 2023 15:55:24 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, linux-mm@...ck.org, arnd@...db.de,
        christophe.leroy@...roup.eu, hch@....de, rppt@...nel.org,
        willy@...radead.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
        David.Laight@...LAB.COM, shorne@...il.com, deller@....de,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v6 15/19] mm/ioremap: Consider IOREMAP space in generic ioremap

From: Christophe Leroy <christophe.leroy@...roup.eu>

Architectures like powerpc have a dedicated space for IOREMAP mappings.

If so, use it in generic_ioremap_prot().

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Baoquan He <bhe@...hat.com>
---
v5->v6:
  Add definition of IOREMAP_START|END in mm/ioremap.c so that
  we can call __get_vm_area_caller() for all ARCH-es - Christoph
  
 mm/ioremap.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/mm/ioremap.c b/mm/ioremap.c
index 86b82ec27d2b..68d9895144ad 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -11,6 +11,15 @@
 #include <linux/io.h>
 #include <linux/export.h>
 
+/*
+ * Ioremap often, but not always uses the generic vmalloc area. E.g on
+ * Power ARCH, it could have different ioremap space.
+ */
+#ifndef IOREMAP_START
+#define IOREMAP_START   VMALLOC_START
+#define IOREMAP_END     VMALLOC_END
+#endif
+
 void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
 				   pgprot_t prot)
 {
@@ -35,8 +44,8 @@ void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
 	if (!ioremap_allowed(phys_addr, size, pgprot_val(prot)))
 		return NULL;
 
-	area = get_vm_area_caller(size, VM_IOREMAP,
-			__builtin_return_address(0));
+	area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START,
+				    IOREMAP_END, __builtin_return_address(0));
 	if (!area)
 		return NULL;
 	vaddr = (unsigned long)area->addr;
@@ -66,7 +75,7 @@ void generic_iounmap(volatile void __iomem *addr)
 	if (!iounmap_allowed(vaddr))
 		return;
 
-	if (is_vmalloc_addr(vaddr))
+	if (is_ioremap_addr(vaddr))
 		vunmap(vaddr);
 }
 
-- 
2.34.1