The patch titled
Subject: s390/pci_mmio: use follow_pfnmap API
has been added to the -mm mm-unstable branch. Its filename is
s390-pci_mmio-use-follow_pfnmap-api.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/s390-pci_mmio-use-follow_pfnmap-api.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: s390/pci_mmio: use follow_pfnmap API
Date: Mon, 26 Aug 2024 16:43:45 -0400
Use the new API that can understand huge pfn mappings.
Link: https://lkml.kernel.org/r/20240826204353.2228736-12-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Gavin Shan <gshan@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/pci/pci_mmio.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
--- a/arch/s390/pci/pci_mmio.c~s390-pci_mmio-use-follow_pfnmap-api
+++ a/arch/s390/pci/pci_mmio.c
@@ -118,12 +118,11 @@ static inline int __memcpy_toio_inuser(v
SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr,
const void __user *, user_buffer, size_t, length)
{
+ struct follow_pfnmap_args args = { };
u8 local_buf[64];
void __iomem *io_addr;
void *buf;
struct vm_area_struct *vma;
- pte_t *ptep;
- spinlock_t *ptl;
long ret;
if (!zpci_is_enabled())
@@ -169,11 +168,13 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, uns
if (!(vma->vm_flags & VM_WRITE))
goto out_unlock_mmap;
- ret = follow_pte(vma, mmio_addr, &ptep, &ptl);
+ args.address = mmio_addr;
+ args.vma = vma;
+ ret = follow_pfnmap_start(&args);
if (ret)
goto out_unlock_mmap;
- io_addr = (void __iomem *)((pte_pfn(*ptep) << PAGE_SHIFT) |
+ io_addr = (void __iomem *)((args.pfn << PAGE_SHIFT) |
(mmio_addr & ~PAGE_MASK));
if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE)
@@ -181,7 +182,7 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, uns
ret = zpci_memcpy_toio(io_addr, buf, length);
out_unlock_pt:
- pte_unmap_unlock(ptep, ptl);
+ follow_pfnmap_end(&args);
out_unlock_mmap:
mmap_read_unlock(current->mm);
out_free:
@@ -260,12 +261,11 @@ static inline int __memcpy_fromio_inuser
SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr,
void __user *, user_buffer, size_t, length)
{
+ struct follow_pfnmap_args args = { };
u8 local_buf[64];
void __iomem *io_addr;
void *buf;
struct vm_area_struct *vma;
- pte_t *ptep;
- spinlock_t *ptl;
long ret;
if (!zpci_is_enabled())
@@ -308,11 +308,13 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsi
if (!(vma->vm_flags & VM_WRITE))
goto out_unlock_mmap;
- ret = follow_pte(vma, mmio_addr, &ptep, &ptl);
+ args.vma = vma;
+ args.address = mmio_addr;
+ ret = follow_pfnmap_start(&args);
if (ret)
goto out_unlock_mmap;
- io_addr = (void __iomem *)((pte_pfn(*ptep) << PAGE_SHIFT) |
+ io_addr = (void __iomem *)((args.pfn << PAGE_SHIFT) |
(mmio_addr & ~PAGE_MASK));
if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE) {
@@ -322,7 +324,7 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsi
ret = zpci_memcpy_fromio(buf, io_addr, length);
out_unlock_pt:
- pte_unmap_unlock(ptep, ptl);
+ follow_pfnmap_end(&args);
out_unlock_mmap:
mmap_read_unlock(current->mm);
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-dax-dump-start-address-in-fault-handler.patch
mm-mprotect-push-mmu-notifier-to-puds.patch
mm-powerpc-add-missing-pud-helpers.patch
mm-x86-make-pud_leaf-only-care-about-pse-bit.patch
mm-x86-implement-arch_check_zapped_pud.patch
mm-x86-add-missing-pud-helpers.patch
mm-mprotect-fix-dax-pud-handlings.patch
mm-introduce-arch_supports_huge_pfnmap-and-special-bits-to-pmd-pud.patch
mm-drop-is_huge_zero_pud.patch
mm-mark-special-bits-for-huge-pfn-mappings-when-inject.patch
mm-allow-thp-orders-for-pfnmaps.patch
mm-gup-detect-huge-pfnmap-entries-in-gup-fast.patch
mm-pagewalk-check-pfnmap-for-folio_walk_start.patch
mm-fork-accept-huge-pfnmap-entries.patch
mm-always-define-pxx_pgprot.patch
mm-new-follow_pfnmap-api.patch
kvm-use-follow_pfnmap-api.patch
s390-pci_mmio-use-follow_pfnmap-api.patch
mm-x86-pat-use-the-new-follow_pfnmap-api.patch
vfio-use-the-new-follow_pfnmap-api.patch
acrn-use-the-new-follow_pfnmap-api.patch
mm-access_process_vm-use-the-new-follow_pfnmap-api.patch
mm-remove-follow_pte.patch
mm-x86-support-large-pfn-mappings.patch
mm-arm64-support-large-pfn-mappings.patch
