From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f171.google.com (mail-wi0-f171.google.com [209.85.212.171]) by kanga.kvack.org (Postfix) with ESMTP id C29ED900015 for ; Tue, 2 Jun 2015 12:21:10 -0400 (EDT) Received: by wifw1 with SMTP id w1so151425189wif.0 for ; Tue, 02 Jun 2015 09:21:10 -0700 (PDT) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id ge5si31335857wjb.125.2015.06.02.09.21.08 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 02 Jun 2015 09:21:08 -0700 (PDT) Date: Tue, 2 Jun 2015 18:21:03 +0200 From: "Luis R. Rodriguez" Subject: Re: [PATCH v12 0/10] Support Write-Through mapping on x86 Message-ID: <20150602162103.GL23057@wotan.suse.de> References: <1433187393-22688-1-git-send-email-toshi.kani@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1433187393-22688-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: Toshi Kani Cc: bp@alien8.de, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-nvdimm@lists.01.org, jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com, Elliott@hp.com, hch@lst.de On Mon, Jun 01, 2015 at 01:36:23PM -0600, Toshi Kani wrote: > This patchset adds support of Write-Through (WT) mapping on x86. > The study below shows that using WT mapping may be useful for > non-volatile memory. > > http://www.hpl.hp.com/techreports/2012/HPL-2012-236.pdf > > The patchset consists of the following changes. > - Patch 1/10 to 6/10 add ioremap_wt() > - Patch 7/10 adds pgprot_writethrough() > - Patch 8/10 to 9/10 add set_memory_wt() > - Patch 10/10 changes the pmem driver to call ioremap_wt() > > All new/modified interfaces have been tested. > > The patchset is based on: > git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git#tip-mm-2 While at it can you also look at: mcgrof@ergon ~/linux-next (git::master)$ git grep -4 "writethrough" drivers/infiniband/ drivers/infiniband/hw/ipath/ipath_driver.c- drivers/infiniband/hw/ipath/ipath_driver.c- dd->ipath_pcirev = pdev->revision; drivers/infiniband/hw/ipath/ipath_driver.c- drivers/infiniband/hw/ipath/ipath_driver.c-#if defined(__powerpc__) drivers/infiniband/hw/ipath/ipath_driver.c: /* There isn't a generic way to specify writethrough mappings */ drivers/infiniband/hw/ipath/ipath_driver.c- dd->ipath_kregbase = __ioremap(addr, len, drivers/infiniband/hw/ipath/ipath_driver.c- (_PAGE_NO_CACHE|_PAGE_WRITETHRU)); drivers/infiniband/hw/ipath/ipath_driver.c-#else drivers/infiniband/hw/ipath/ipath_driver.c- dd->ipath_kregbase = ioremap_nocache(addr, len); -- drivers/infiniband/hw/ipath/ipath_file_ops.c- drivers/infiniband/hw/ipath/ipath_file_ops.c- phys = dd->ipath_physaddr + piobufs; drivers/infiniband/hw/ipath/ipath_file_ops.c- drivers/infiniband/hw/ipath/ipath_file_ops.c-#if defined(__powerpc__) drivers/infiniband/hw/ipath/ipath_file_ops.c: /* There isn't a generic way to specify writethrough mappings */ drivers/infiniband/hw/ipath/ipath_file_ops.c- pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; drivers/infiniband/hw/ipath/ipath_file_ops.c- pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU; drivers/infiniband/hw/ipath/ipath_file_ops.c- pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED; drivers/infiniband/hw/ipath/ipath_file_ops.c-#endif -- drivers/infiniband/hw/qib/qib_file_ops.c- drivers/infiniband/hw/qib/qib_file_ops.c- phys = dd->physaddr + piobufs; drivers/infiniband/hw/qib/qib_file_ops.c- drivers/infiniband/hw/qib/qib_file_ops.c-#if defined(__powerpc__) drivers/infiniband/hw/qib/qib_file_ops.c: /* There isn't a generic way to specify writethrough mappings */ drivers/infiniband/hw/qib/qib_file_ops.c- pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; drivers/infiniband/hw/qib/qib_file_ops.c- pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU; drivers/infiniband/hw/qib/qib_file_ops.c- pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED; drivers/infiniband/hw/qib/qib_file_ops.c-#endif -- drivers/infiniband/hw/qib/qib_pcie.c- addr = pci_resource_start(pdev, 0); drivers/infiniband/hw/qib/qib_pcie.c- len = pci_resource_len(pdev, 0); drivers/infiniband/hw/qib/qib_pcie.c- drivers/infiniband/hw/qib/qib_pcie.c-#if defined(__powerpc__) drivers/infiniband/hw/qib/qib_pcie.c: /* There isn't a generic way to specify writethrough mappings */ drivers/infiniband/hw/qib/qib_pcie.c- dd->kregbase = __ioremap(addr, len, _PAGE_NO_CACHE | _PAGE_WRITETHRU); drivers/infiniband/hw/qib/qib_pcie.c-#else drivers/infiniband/hw/qib/qib_pcie.c- dd->kregbase = ioremap_nocache(addr, len); drivers/infiniband/hw/qib/qib_pcie.c-#endif Luis -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org