diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2017-04-12 15:25:53 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-18 21:01:02 +0300 |
| commit | 03a064b431eb5cb0a91012699ac1e4d6302b327d (patch) | |
| tree | a9286d1700f94a99900dd981f1aa89323d592b2c /arch/xtensa | |
| parent | cef4d02305a06be581bb7f4353446717a1b319ec (diff) | |
| download | linux-03a064b431eb5cb0a91012699ac1e4d6302b327d.tar.xz | |
xtensa/PCI: Do not mmap PCI BARs to userspace as write-through
These should be uncached, not write-through.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'arch/xtensa')
| -rw-r--r-- | arch/xtensa/kernel/pci.c | 21 |
1 files changed, 1 insertions, 20 deletions
diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c index b848cc3dc913..5b73fc2f076c 100644 --- a/arch/xtensa/kernel/pci.c +++ b/arch/xtensa/kernel/pci.c @@ -334,25 +334,6 @@ __pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma, } /* - * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci - * device mapping. - */ -static __inline__ void -__pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma, - enum pci_mmap_state mmap_state, int write_combine) -{ - int prot = pgprot_val(vma->vm_page_prot); - - /* Set to write-through */ - prot = (prot & _PAGE_CA_MASK) | _PAGE_CA_WT; -#if 0 - if (!write_combine) - prot |= _PAGE_WRITETHRU; -#endif - vma->vm_page_prot = __pgprot(prot); -} - -/* * Perform the actual remap of the pages for a PCI device mapping, as * appropriate for this architecture. The region in the process to map * is described by vm_start and vm_end members of VMA, the base physical @@ -372,7 +353,7 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, if (ret < 0) return ret; - __pci_mmap_set_pgprot(dev, vma, mmap_state, write_combine); + vma->vm_page_prot = pgprot_device(vma->vm_page_prot); ret = io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, vma->vm_end - vma->vm_start,vma->vm_page_prot); |