From: Baoquan He <bhe@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org, linux-mm@kvack.org, arnd@arndb.de,
hch@lst.de, christophe.leroy@csgroup.eu, rppt@kernel.org,
willy@infradead.org, agordeev@linux.ibm.com,
wangkefeng.wang@huawei.com, schnelle@linux.ibm.com,
David.Laight@ACULAB.COM, shorne@gmail.com, deller@gmx.de,
nathan@kernel.org, glaubitz@physik.fu-berlin.de,
Baoquan He <bhe@redhat.com>, Brian Cain <bcain@quicinc.com>,
linux-hexagon@vger.kernel.org
Subject: [PATCH v7 02/19] hexagon: mm: Convert to GENERIC_IOREMAP
Date: Tue, 20 Jun 2023 21:13:39 +0800 [thread overview]
Message-ID: <20230620131356.25440-3-bhe@redhat.com> (raw)
In-Reply-To: <20230620131356.25440-1-bhe@redhat.com>
By taking GENERIC_IOREMAP method, the generic ioremap_prot() and
iounmap() are visible and available to arch. This change will
simplify implementation by removing duplicated codes with generic
ioremap_prot() and iounmap(), and has the equivalent functioality.
For hexagon, the current ioremap() and iounmap() are the same as
generic version. After taking GENERIC_IOREMAP way, the old ioremap()
and iounmap() can be completely removed.
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Brian Cain <bcain@quicinc.com>
Cc: linux-hexagon@vger.kernel.org
---
v6->v7:
- Fix building error reported by lkp test robot. Here I only fixed the
redefinition of iounmap(), ignored the PCI_IOBASE warnings since
Nathan kindly reminded me the warning is a generic issue, and Niklas
is working on that within below patchset.
https://lore.kernel.org/all/20230612160237.GA199007@dev-arch.thelio-3990X/T/#u
arch/hexagon/Kconfig | 1 +
arch/hexagon/include/asm/io.h | 11 +++++----
arch/hexagon/mm/ioremap.c | 44 -----------------------------------
3 files changed, 8 insertions(+), 48 deletions(-)
delete mode 100644 arch/hexagon/mm/ioremap.c
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 54eadf265178..17afffde1a7f 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -25,6 +25,7 @@ config HEXAGON
select NEED_SG_DMA_LENGTH
select NO_IOPORT_MAP
select GENERIC_IOMAP
+ select GENERIC_IOREMAP
select GENERIC_SMP_IDLE_THREAD
select STACKTRACE_SUPPORT
select GENERIC_CLOCKEVENTS_BROADCAST
diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
index 46a099de85b7..e2b308e32a37 100644
--- a/arch/hexagon/include/asm/io.h
+++ b/arch/hexagon/include/asm/io.h
@@ -27,8 +27,6 @@
extern int remap_area_pages(unsigned long start, unsigned long phys_addr,
unsigned long end, unsigned long flags);
-extern void iounmap(const volatile void __iomem *addr);
-
/* Defined in lib/io.c, needed for smc91x driver. */
extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
@@ -170,8 +168,13 @@ static inline void writel(u32 data, volatile void __iomem *addr)
#define writew_relaxed __raw_writew
#define writel_relaxed __raw_writel
-void __iomem *ioremap(unsigned long phys_addr, unsigned long size);
-#define ioremap_uc(X, Y) ioremap((X), (Y))
+/*
+ * I/O memory mapping functions.
+ */
+#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+ (__HEXAGON_C_DEV << 6))
+
+#define ioremap_uc(addr, size) ioremap((addr), (size))
#define __raw_writel writel
diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
deleted file mode 100644
index 255c5b1ee1a7..000000000000
--- a/arch/hexagon/mm/ioremap.c
+++ /dev/null
@@ -1,44 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * I/O remap functions for Hexagon
- *
- * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
- */
-
-#include <linux/io.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-
-void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
-{
- unsigned long last_addr, addr;
- unsigned long offset = phys_addr & ~PAGE_MASK;
- struct vm_struct *area;
-
- pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
- |(__HEXAGON_C_DEV << 6));
-
- last_addr = phys_addr + size - 1;
-
- /* Wrapping not allowed */
- if (!size || (last_addr < phys_addr))
- return NULL;
-
- /* Rounds up to next page size, including whole-page offset */
- size = PAGE_ALIGN(offset + size);
-
- area = get_vm_area(size, VM_IOREMAP);
- addr = (unsigned long)area->addr;
-
- if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
- vunmap((void *)addr);
- return NULL;
- }
-
- return (void __iomem *) (offset + addr);
-}
-
-void iounmap(const volatile void __iomem *addr)
-{
- vunmap((void *) ((unsigned long) addr & PAGE_MASK));
-}
--
2.34.1
next parent reply other threads:[~2023-06-20 13:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230620131356.25440-1-bhe@redhat.com>
2023-06-20 13:13 ` Baoquan He [this message]
2023-06-21 2:15 ` [PATCH v7 02/19] hexagon: mm: Convert to GENERIC_IOREMAP kernel test robot
2023-06-21 8:50 ` Baoquan He
2023-06-21 19:08 ` Nathan Chancellor
2023-06-25 1:15 ` Baoquan He
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