device-dax: drop the dax_region.pfn_flags attribute

All callers specify the same flags to alloc_dax_region(), so there is no
need to allow for anything other than PFN_DEV|PFN_MAP, or carry a
->pfn_flags around on the region.  Device-dax instances are always page
backed.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Jia He <justin.he@arm.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Link: https://lkml.kernel.org/r/159643098829.4062302.13611520567669439046.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index df238c8..f06ffa6 100644 (file)
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -226,8 +226,7 @@ static void dax_region_unregister(void *region)
 }
 
 struct dax_region *alloc_dax_region(struct device *parent, int region_id,
-               struct resource *res, int target_node, unsigned int align,
-               unsigned long long pfn_flags)
+               struct resource *res, int target_node, unsigned int align)
 {
        struct dax_region *dax_region;
 
@@ -251,7 +250,6 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
 
        dev_set_drvdata(parent, dax_region);
        memcpy(&dax_region->res, res, sizeof(*res));
-       dax_region->pfn_flags = pfn_flags;
        kref_init(&dax_region->kref);
        dax_region->id = region_id;
        dax_region->align = align;

diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h
index 9e4eba6..55577e9 100644 (file)
--- a/drivers/dax/bus.h
+++ b/drivers/dax/bus.h
@@ -10,8 +10,7 @@ struct dax_device;
 struct dax_region;
 void dax_region_put(struct dax_region *dax_region);
 struct dax_region *alloc_dax_region(struct device *parent, int region_id,
-               struct resource *res, int target_node, unsigned int align,
-               unsigned long long flags);
+               struct resource *res, int target_node, unsigned int align);
 
 enum dev_dax_subsys {
        DEV_DAX_BUS,

diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
index 16850d5..8a4c40c 100644 (file)
--- a/drivers/dax/dax-private.h
+++ b/drivers/dax/dax-private.h
@@ -23,7 +23,6 @@ void dax_bus_exit(void);
  * @dev: parent device backing this region
  * @align: allocation and mapping alignment for child dax devices
  * @res: physical address range of the region
- * @pfn_flags: identify whether the pfns are paged back or not
  */
 struct dax_region {
        int id;
@@ -32,7 +31,6 @@ struct dax_region {
        struct device *dev;
        unsigned int align;
        struct resource res;
-       unsigned long long pfn_flags;
 };
 
 /**

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 1e89513..c528b72 100644 (file)
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -41,14 +41,6 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
                return -EINVAL;
        }
 
-       if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV
-                       && (vma->vm_flags & VM_DONTCOPY) == 0) {
-               dev_info_ratelimited(dev,
-                               "%s: %s: fail, dax range requires MADV_DONTFORK\n",
-                               current->comm, func);
-               return -EINVAL;
-       }
-
        if (!vma_is_dax(vma)) {
                dev_info_ratelimited(dev,
                                "%s: %s: fail, vma is not DAX capable\n",
@@ -102,7 +94,7 @@ static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax,
                return VM_FAULT_SIGBUS;
        }
 
-       *pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
+       *pfn = phys_to_pfn_t(phys, PFN_DEV|PFN_MAP);
 
        return vmf_insert_mixed(vmf->vma, vmf->address, *pfn);
 }
@@ -127,12 +119,6 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax,
                return VM_FAULT_SIGBUS;
        }
 
-       /* dax pmd mappings require pfn_t_devmap() */
-       if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) {
-               dev_dbg(dev, "region lacks devmap flags\n");
-               return VM_FAULT_SIGBUS;
-       }
-
        if (fault_size < dax_region->align)
                return VM_FAULT_SIGBUS;
        else if (fault_size > dax_region->align)
@@ -150,7 +136,7 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax,
                return VM_FAULT_SIGBUS;
        }
 
-       *pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
+       *pfn = phys_to_pfn_t(phys, PFN_DEV|PFN_MAP);
 
        return vmf_insert_pfn_pmd(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
 }
@@ -177,12 +163,6 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
                return VM_FAULT_SIGBUS;
        }
 
-       /* dax pud mappings require pfn_t_devmap() */
-       if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) {
-               dev_dbg(dev, "region lacks devmap flags\n");
-               return VM_FAULT_SIGBUS;
-       }
-
        if (fault_size < dax_region->align)
                return VM_FAULT_SIGBUS;
        else if (fault_size > dax_region->align)
@@ -200,7 +180,7 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
                return VM_FAULT_SIGBUS;
        }
 
-       *pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
+       *pfn = phys_to_pfn_t(phys, PFN_DEV|PFN_MAP);
 
        return vmf_insert_pfn_pud(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
 }

diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
index 29ceb57..5068938 100644 (file)
--- a/drivers/dax/hmem/hmem.c
+++ b/drivers/dax/hmem/hmem.c
@@ -22,7 +22,7 @@ static int dax_hmem_probe(struct platform_device *pdev)
        memcpy(&pgmap.res, res, sizeof(*res));
 
        dax_region = alloc_dax_region(dev, pdev->id, res, mri->target_node,
-                       PMD_SIZE, PFN_DEV|PFN_MAP);
+                       PMD_SIZE);
        if (!dax_region)
                return -ENOMEM;
 

diff --git a/drivers/dax/pmem/core.c b/drivers/dax/pmem/core.c
index 2bedf84..ea52bb7 100644 (file)
--- a/drivers/dax/pmem/core.c
+++ b/drivers/dax/pmem/core.c
@@ -53,8 +53,7 @@ struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys)
        memcpy(&res, &pgmap.res, sizeof(res));
        res.start += offset;
        dax_region = alloc_dax_region(dev, region_id, &res,
-                       nd_region->target_node, le32_to_cpu(pfn_sb->align),
-                       PFN_DEV|PFN_MAP);
+                       nd_region->target_node, le32_to_cpu(pfn_sb->align));
        if (!dax_region)
                return ERR_PTR(-ENOMEM);