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@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>