From: Kefeng Wang <wangkefeng.wang@huawei.com> To: <catalin.marinas@arm.com>, <will@kernel.org>, <akpm@linux-foundation.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org> Cc: <linux-mm@kvack.org>, <hch@infradead.org>, <arnd@arndb.de>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH v2 3/5] mm: ioremap: Add arch_ioremap/iounmap() Date: Fri, 29 Apr 2022 18:32:23 +0800 [thread overview] Message-ID: <20220429103225.75121-4-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20220429103225.75121-1-wangkefeng.wang@huawei.com> Add special hook for architecture to verify addr, size and prot or setup when ioremap() or iounmap(), which will make the generic ioremap more useful. arch_ioremap() return a 'void __iomem *', - IS_ERR means return an error - NULL means continue to remap - a non-NULL, non-IS_ERR pointer is directly returned arch_iounmap() return a int value, - 0 means continue to vunmap - error code means skip vunmap and return directly Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- include/asm-generic/io.h | 14 ++++++++++++++ mm/ioremap.c | 14 +++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index e6ffa2519f08..f2f9aeedb5e8 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -964,6 +964,20 @@ static inline void iounmap(volatile void __iomem *addr) #elif defined(CONFIG_GENERIC_IOREMAP) #include <linux/pgtable.h> +#ifndef arch_ioremap +static inline void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot) +{ + return NULL; +} +#endif + +#ifndef arch_iounmap +static inline int arch_iounmap(void __iomem *addr) +{ + return 0; +} +#endif + void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, unsigned long prot); void iounmap(volatile void __iomem *addr); diff --git a/mm/ioremap.c b/mm/ioremap.c index 7cb9996b0c12..de5a2e899e14 100644 --- a/mm/ioremap.c +++ b/mm/ioremap.c @@ -16,6 +16,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, unsigned long pro unsigned long offset, vaddr; phys_addr_t last_addr; struct vm_struct *area; + void __iomem *base; /* Disallow wrap-around or zero size */ last_addr = phys_addr + size - 1; @@ -27,6 +28,12 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, unsigned long pro phys_addr -= offset; size = PAGE_ALIGN(size + offset); + base = arch_ioremap(phys_addr, size, prot); + if (IS_ERR(base)) + return NULL; + else if (base) + return base; + area = get_vm_area_caller(size, VM_IOREMAP, __builtin_return_address(0)); if (!area) @@ -45,6 +52,11 @@ EXPORT_SYMBOL(ioremap_prot); void iounmap(volatile void __iomem *addr) { - vunmap((void *)((unsigned long)addr & PAGE_MASK)); + void *vaddr = (void *)((unsigned long)addr & PAGE_MASK); + + if (arch_iounmap(vaddr)) + return; + + vunmap(vaddr); } EXPORT_SYMBOL(iounmap); -- 2.35.3
WARNING: multiple messages have this Message-ID (diff)
From: Kefeng Wang <wangkefeng.wang@huawei.com> To: <catalin.marinas@arm.com>, <will@kernel.org>, <akpm@linux-foundation.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org> Cc: <linux-mm@kvack.org>, <hch@infradead.org>, <arnd@arndb.de>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH v2 3/5] mm: ioremap: Add arch_ioremap/iounmap() Date: Fri, 29 Apr 2022 18:32:23 +0800 [thread overview] Message-ID: <20220429103225.75121-4-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20220429103225.75121-1-wangkefeng.wang@huawei.com> Add special hook for architecture to verify addr, size and prot or setup when ioremap() or iounmap(), which will make the generic ioremap more useful. arch_ioremap() return a 'void __iomem *', - IS_ERR means return an error - NULL means continue to remap - a non-NULL, non-IS_ERR pointer is directly returned arch_iounmap() return a int value, - 0 means continue to vunmap - error code means skip vunmap and return directly Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- include/asm-generic/io.h | 14 ++++++++++++++ mm/ioremap.c | 14 +++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index e6ffa2519f08..f2f9aeedb5e8 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -964,6 +964,20 @@ static inline void iounmap(volatile void __iomem *addr) #elif defined(CONFIG_GENERIC_IOREMAP) #include <linux/pgtable.h> +#ifndef arch_ioremap +static inline void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot) +{ + return NULL; +} +#endif + +#ifndef arch_iounmap +static inline int arch_iounmap(void __iomem *addr) +{ + return 0; +} +#endif + void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, unsigned long prot); void iounmap(volatile void __iomem *addr); diff --git a/mm/ioremap.c b/mm/ioremap.c index 7cb9996b0c12..de5a2e899e14 100644 --- a/mm/ioremap.c +++ b/mm/ioremap.c @@ -16,6 +16,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, unsigned long pro unsigned long offset, vaddr; phys_addr_t last_addr; struct vm_struct *area; + void __iomem *base; /* Disallow wrap-around or zero size */ last_addr = phys_addr + size - 1; @@ -27,6 +28,12 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, unsigned long pro phys_addr -= offset; size = PAGE_ALIGN(size + offset); + base = arch_ioremap(phys_addr, size, prot); + if (IS_ERR(base)) + return NULL; + else if (base) + return base; + area = get_vm_area_caller(size, VM_IOREMAP, __builtin_return_address(0)); if (!area) @@ -45,6 +52,11 @@ EXPORT_SYMBOL(ioremap_prot); void iounmap(volatile void __iomem *addr) { - vunmap((void *)((unsigned long)addr & PAGE_MASK)); + void *vaddr = (void *)((unsigned long)addr & PAGE_MASK); + + if (arch_iounmap(vaddr)) + return; + + vunmap(vaddr); } EXPORT_SYMBOL(iounmap); -- 2.35.3 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-04-29 10:21 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-29 10:32 [PATCH v2 0/5] arm64: Cleanup ioremap() and support ioremap_prot() Kefeng Wang 2022-04-29 10:32 ` Kefeng Wang 2022-04-29 10:32 ` [PATCH v2 1/5] mm: ioremap: Use more sensibly name in ioremap_prot() Kefeng Wang 2022-04-29 10:32 ` Kefeng Wang 2022-05-02 9:38 ` Anshuman Khandual 2022-05-02 9:38 ` Anshuman Khandual 2022-04-29 10:32 ` [PATCH v2 2/5] mm: ioremap: Setup phys_addr of struct vm_struct Kefeng Wang 2022-04-29 10:32 ` Kefeng Wang 2022-05-02 9:50 ` Anshuman Khandual 2022-05-02 9:50 ` Anshuman Khandual 2022-04-29 10:32 ` Kefeng Wang [this message] 2022-04-29 10:32 ` [PATCH v2 3/5] mm: ioremap: Add arch_ioremap/iounmap() Kefeng Wang 2022-05-19 4:46 ` Anshuman Khandual 2022-05-19 4:46 ` Anshuman Khandual 2022-05-19 6:24 ` Kefeng Wang 2022-05-19 6:24 ` Kefeng Wang 2022-04-29 10:32 ` [PATCH v2 4/5] arm64: mm: Convert to GENERIC_IOREMAP Kefeng Wang 2022-04-29 10:32 ` Kefeng Wang 2022-04-29 23:15 ` kernel test robot 2022-04-29 23:15 ` kernel test robot 2022-05-02 3:27 ` [PATCH v2 resend " Kefeng Wang 2022-05-02 3:27 ` Kefeng Wang 2022-05-16 22:47 ` Catalin Marinas 2022-05-16 22:47 ` Catalin Marinas 2022-05-19 5:34 ` Anshuman Khandual 2022-05-19 5:34 ` Anshuman Khandual 2022-05-19 6:31 ` Kefeng Wang 2022-05-19 6:31 ` Kefeng Wang 2022-04-29 10:32 ` [PATCH v2 5/5] arm64: Add HAVE_IOREMAP_PROT support Kefeng Wang 2022-04-29 10:32 ` Kefeng Wang 2022-05-16 22:48 ` Catalin Marinas 2022-05-16 22:48 ` Catalin Marinas 2022-05-19 5:06 ` Anshuman Khandual 2022-05-19 5:06 ` Anshuman Khandual 2022-05-10 7:06 ` [PATCH v2 0/5] arm64: Cleanup ioremap() and support ioremap_prot() Kefeng Wang 2022-05-10 7:06 ` Kefeng Wang 2022-05-16 22:51 ` Catalin Marinas 2022-05-16 22:51 ` Catalin Marinas 2022-05-19 3:37 ` Kefeng Wang 2022-05-19 3:37 ` Kefeng Wang
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