The patch titled
Subject: device-dax: drop the dax_region.pfn_flags attribute
has been added to the -mm tree. Its filename is
device-dax-drop-the-dax_regionpfn_flags-attribute.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/device-dax-drop-the-dax_regionpfn_flags-attribute.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/device-dax-drop-the-dax_regionpfn_flags-attribute.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: 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.
Link: https://lkml.kernel.org/r/159643098829.4062302.13611520567669439046.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brice Goglin <Brice.Goglin@xxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Jia He <justin.he@xxxxxxx>
Cc: Joao Martins <joao.m.martins@xxxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/dax/bus.c | 4 +---
drivers/dax/bus.h | 3 +--
drivers/dax/dax-private.h | 2 --
drivers/dax/device.c | 26 +++-----------------------
drivers/dax/hmem/hmem.c | 2 +-
drivers/dax/pmem/core.c | 3 +--
6 files changed, 7 insertions(+), 33 deletions(-)
--- a/drivers/dax/bus.c~device-dax-drop-the-dax_regionpfn_flags-attribute
+++ a/drivers/dax/bus.c
@@ -226,8 +226,7 @@ static void dax_region_unregister(void *
}
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(stru
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;
--- a/drivers/dax/bus.h~device-dax-drop-the-dax_regionpfn_flags-attribute
+++ a/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,
--- a/drivers/dax/dax-private.h~device-dax-drop-the-dax_regionpfn_flags-attribute
+++ a/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;
};
/**
--- a/drivers/dax/device.c~device-dax-drop-the-dax_regionpfn_flags-attribute
+++ a/drivers/dax/device.c
@@ -41,14 +41,6 @@ static int check_vma(struct dev_dax *dev
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(st
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(st
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(st
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(st
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(st
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);
}
--- a/drivers/dax/hmem/hmem.c~device-dax-drop-the-dax_regionpfn_flags-attribute
+++ a/drivers/dax/hmem/hmem.c
@@ -22,7 +22,7 @@ static int dax_hmem_probe(struct platfor
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;
--- a/drivers/dax/pmem/core.c~device-dax-drop-the-dax_regionpfn_flags-attribute
+++ a/drivers/dax/pmem/core.c
@@ -53,8 +53,7 @@ struct dev_dax *__dax_pmem_probe(struct
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);
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
x86-numa-cleanup-configuration-dependent-command-line-options.patch
x86-numa-add-nohmat-option.patch
efi-fake_mem-arrange-for-a-resource-entry-per-efi_fake_mem-instance.patch
acpi-hmat-refactor-hmat_register_target_device-to-hmem_register_device.patch
resource-report-parent-to-walk_iomem_res_desc-callback.patch
mm-memory_hotplug-introduce-default-phys_to_target_node-implementation.patch
acpi-hmat-attach-a-device-for-each-soft-reserved-range.patch
device-dax-drop-the-dax_regionpfn_flags-attribute.patch
device-dax-move-instance-creation-parameters-to-struct-dev_dax_data.patch
device-dax-make-pgmap-optional-for-instance-creation.patch
device-dax-kill-dax_kmem_res.patch
device-dax-add-an-allocation-interface-for-device-dax-instances.patch
device-dax-introduce-seed-devices.patch
drivers-base-make-device_find_child_by_name-compatible-with-sysfs-inputs.patch
device-dax-add-resize-support.patch
mm-memremap_pages-convert-to-struct-range.patch
mm-memremap_pages-support-multiple-ranges-per-invocation.patch
device-dax-add-dis-contiguous-resource-support.patch
device-dax-introduce-mapping-devices.patch
