linux-kernel - [PATCH 11/19] s390/pci_mmio: Use follow

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Message-ID: <20240809160909.1023470-12-peterx@redhat.com>
Date: Fri,  9 Aug 2024 12:09:01 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Sean Christopherson <seanjc@...gle.com>,
	Oscar Salvador <osalvador@...e.de>,
	Jason Gunthorpe <jgg@...dia.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org,
	peterx@...hat.com,
	Will Deacon <will@...nel.org>,
	Gavin Shan <gshan@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Zi Yan <ziy@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Alistair Popple <apopple@...dia.com>,
	Borislav Petkov <bp@...en8.de>,
	David Hildenbrand <david@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	kvm@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Yan Zhao <yan.y.zhao@...el.com>,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	linux-s390@...r.kernel.org
Subject: [PATCH 11/19] s390/pci_mmio: Use follow_pfnmap API

Use the new API that can understand huge pfn mappings.

Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
Cc: Sven Schnelle <svens@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/s390/pci/pci_mmio.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/arch/s390/pci/pci_mmio.c b/arch/s390/pci/pci_mmio.c
index 5398729bfe1b..de5c0b389a3e 100644
--- a/arch/s390/pci/pci_mmio.c
+++ b/arch/s390/pci/pci_mmio.c
@@ -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);
 
-- 
2.45.0