^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Generic PCI resource mmap helper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright © 2017 Amazon.com, Inc. or its affiliates.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: David Woodhouse <dwmw2@infradead.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Modern setup: generic pci_mmap_resource_range(), and implement the legacy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * pci_mmap_page_range() (if needed) as a wrapper round it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #ifdef HAVE_PCI_MMAP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) int pci_mmap_page_range(struct pci_dev *pdev, int bar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) enum pci_mmap_state mmap_state, int write_combine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) resource_size_t start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) pci_resource_to_user(pdev, bar, &pdev->resource[bar], &start, &end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* Adjust vm_pgoff to be the offset within the resource */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) vma->vm_pgoff -= start >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return pci_mmap_resource_range(pdev, bar, vma, mmap_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) write_combine);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static const struct vm_operations_struct pci_phys_vm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #ifdef CONFIG_HAVE_IOREMAP_PROT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) .access = generic_access_phys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) enum pci_mmap_state mmap_state, int write_combine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (vma->vm_pgoff + vma_pages(vma) > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (write_combine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (mmap_state == pci_mmap_io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ret = pci_iobar_pfn(pdev, bar, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) vma->vm_ops = &pci_phys_vm_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) vma->vm_end - vma->vm_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) vma->vm_page_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #elif defined(HAVE_PCI_MMAP) /* && !ARCH_GENERIC_PCI_MMAP_RESOURCE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * Legacy setup: Implement pci_mmap_resource_range() as a wrapper around
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * the architecture's pci_mmap_page_range(), converting to "user visible"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * addresses as necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) enum pci_mmap_state mmap_state, int write_combine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) resource_size_t start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * pci_mmap_page_range() expects the same kind of entry as coming
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * from /proc/bus/pci/ which is a "user visible" value. If this is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * different from the resource itself, arch will do necessary fixup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) pci_resource_to_user(pdev, bar, &pdev->resource[bar], &start, &end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) vma->vm_pgoff += start >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return pci_mmap_page_range(pdev, bar, vma, mmap_state, write_combine);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags