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Tue, 16 May 2023 09:05:48 -0400 X-MC-Unique: GhdKlOAUPYyoefAVSH87Kw-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8965B101A555; Tue, 16 May 2023 13:05:46 +0000 (UTC) Received: from localhost (ovpn-12-79.pek2.redhat.com [10.72.12.79]) by smtp.corp.redhat.com (Postfix) with ESMTPS id AE20DBC88; Tue, 16 May 2023 13:05:45 +0000 (UTC) Date: Tue, 16 May 2023 21:05:41 +0800 From: Baoquan He To: Mike Rapoport Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, arnd@arndb.de, christophe.leroy@csgroup.eu, hch@infradead.org, agordeev@linux.ibm.com, wangkefeng.wang@huawei.com, schnelle@linux.ibm.com, David.Laight@aculab.com, shorne@gmail.com, willy@infradead.org, deller@gmx.de, Jonas Bonn , Stefan Kristiansson , openrisc@lists.librecores.org Subject: Re: [PATCH v5 RESEND 09/17] openrisc: mm: Convert to GENERIC_IOREMAP Message-ID: References: <20230515090848.833045-1-bhe@redhat.com> <20230515090848.833045-10-bhe@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 X-Stat-Signature: oh164ek6t58514erwwyqba9b998b4sba X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: EC45714030D X-Rspam-User: X-HE-Tag: 1684242350-576524 X-HE-Meta: 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 CmeSu//Y w8rVRgIXf56owl3tLXHzjS61z8cEKdBEI4C4snpsRA/7fzSdUc3sDm6/NCoVaGMQRwbG00PRwCaRIbigGbVwYjB3quwSzyvDwGFENy7tdM83W69/vN1MLGR8fEgHsCd+AJe31qCvH0clE7WeMP8Yosy3lcyABoYCJ1gNTfR4UVhYLIR4XvHat/bSFBWy0MD1z/LW6IQApNazRF/AW2qm37NBvrUyqdC0uzpSCKAmqEY/OdRTEMry6ZeV8PUtvuejYHBUFsS37/2otsw4r6OkMJDKVf71xm+5Yo/OKExThglhcJKdfsXRqi1dUQnJqrfYJvoSYKkLIP+k1UezrPyu/5PgxVo9TO8ZdKUzY X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 05/16/23 at 09:49am, Mike Rapoport wrote: > Hi, > > On Mon, May 15, 2023 at 05:08:40PM +0800, Baoquan He wrote: > > By taking GENERIC_IOREMAP method, the generic generic_ioremap_prot(), > > generic_iounmap(), and their generic wrapper ioremap_prot(), ioremap() > > and iounmap() are all visible and available to arch. Arch needs to > > provide wrapper functions to override the generic versions if there's > > arch specific handling in its ioremap_prot(), ioremap() or iounmap(). > > This change will simplify implementation by removing duplicated codes > > with generic_ioremap_prot() and generic_iounmap(), and has the equivalent > > functioality as before. > > > > Here, add wrapper function iounmap() for openrisc's special operation > > when iounmap(). > > > > Signed-off-by: Baoquan He > > Cc: Stafford Horne > > Cc: Jonas Bonn > > Cc: Stefan Kristiansson > > Cc: openrisc@lists.librecores.org > > --- > > arch/openrisc/Kconfig | 1 + > > arch/openrisc/include/asm/io.h | 11 +++++--- > > arch/openrisc/mm/ioremap.c | 46 +--------------------------------- > > 3 files changed, 9 insertions(+), 49 deletions(-) > > > > diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig > > index c7f282f60f64..fd9bb76a610b 100644 > > --- a/arch/openrisc/Kconfig > > +++ b/arch/openrisc/Kconfig > > @@ -21,6 +21,7 @@ config OPENRISC > > select GENERIC_IRQ_PROBE > > select GENERIC_IRQ_SHOW > > select GENERIC_PCI_IOMAP > > + select GENERIC_IOREMAP > > select GENERIC_CPU_DEVICES > > select HAVE_PCI > > select HAVE_UID16 > > diff --git a/arch/openrisc/include/asm/io.h b/arch/openrisc/include/asm/io.h > > index ee6043a03173..e640960c26c2 100644 > > --- a/arch/openrisc/include/asm/io.h > > +++ b/arch/openrisc/include/asm/io.h > > @@ -15,6 +15,8 @@ > > #define __ASM_OPENRISC_IO_H > > > > #include > > +#include > > +#include > > > > /* > > * PCI: We do not use IO ports in OpenRISC > > @@ -27,11 +29,12 @@ > > #define PIO_OFFSET 0 > > #define PIO_MASK 0 > > > > -#define ioremap ioremap > > -void __iomem *ioremap(phys_addr_t offset, unsigned long size); > > - > > +/* > > + * I/O memory mapping functions. > > + */ > > #define iounmap iounmap > > -extern void iounmap(volatile void __iomem *addr); > > + > > +#define _PAGE_IOREMAP (pgprot_val(PAGE_KERNEL) | _PAGE_CI) > > > > #include > > > > diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c > > index 90b59bc53c8c..9f9941df7d4c 100644 > > --- a/arch/openrisc/mm/ioremap.c > > +++ b/arch/openrisc/mm/ioremap.c > > @@ -22,49 +22,6 @@ > > > > extern int mem_init_done; > > > > -/* > > - * Remap an arbitrary physical address space into the kernel virtual > > - * address space. Needed when the kernel wants to access high addresses > > - * directly. > > - * > > - * NOTE! We need to allow non-page-aligned mappings too: we will obviously > > - * have to convert them into an offset in a page-aligned mapping, but the > > - * caller shouldn't need to know that small detail. > > - */ > > -void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size) > > -{ > > - phys_addr_t p; > > - unsigned long v; > > - unsigned long offset, last_addr; > > - struct vm_struct *area = NULL; > > - > > - /* Don't allow wraparound or zero size */ > > - last_addr = addr + size - 1; > > - if (!size || last_addr < addr) > > - return NULL; > > - > > - /* > > - * Mappings have to be page-aligned > > - */ > > - offset = addr & ~PAGE_MASK; > > - p = addr & PAGE_MASK; > > - size = PAGE_ALIGN(last_addr + 1) - p; > > - > > - area = get_vm_area(size, VM_IOREMAP); > > - if (!area) > > - return NULL; > > - v = (unsigned long)area->addr; > > - > > - if (ioremap_page_range(v, v + size, p, > > - __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) { > > - vfree(area->addr); > > - return NULL; > > - } > > - > > - return (void __iomem *)(offset + (char *)v); > > -} > > -EXPORT_SYMBOL(ioremap); > > - > > void iounmap(volatile void __iomem *addr) > > { > > /* If the page is from the fixmap pool then we just clear out > > The page cannot be from fixmap pool since we removed fixmap support from > ioremap in an earlier patch. > I believe that patch should also remove special casing of fixmap in > iounmap() and then openrisc does not need to override any of ioremap > methods. Totally agree. I will clean it up in iounmap() in patch 3, and rearrange this patch. Thanks again. > > > @@ -88,9 +45,8 @@ void iounmap(volatile void __iomem *addr) > > return; > > } > > > > - return vfree((void *)(PAGE_MASK & (unsigned long)addr)); > > + generic_iounmap(addr); > > } > > -EXPORT_SYMBOL(iounmap); > > > > /** > > * OK, this one's a bit tricky... ioremap can get called before memory is > > -- > > 2.34.1 > > > > > > -- > Sincerely yours, > Mike. >