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s390/pci_mmio: use follow_pfnmap API

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Use the new API that can understand huge pfn mappings.

Link: https://lkml.kernel.org/r/20240826204353.2228736-12-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2024-08-26 16:43:45 -04:00 committed by Andrew Morton
parent 5731aacd54
commit bd8c2d18bf
1 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
arch/s390/pci/pci_mmio.c
View File

@ -118,12 +118,11 @@ static inline int __memcpy_toio_inuser(void __iomem *dst,
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, unsigned long, mmio_addr,
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, unsigned long, mmio_addr,
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(void __user *dst,
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, unsigned long, mmio_addr,
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, unsigned long, mmio_addr,
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);