From mboxrd@z Thu Jan 1 00:00:00 1970 From: dwmw2@infradead.org (David Woodhouse) Date: Wed, 15 Mar 2017 17:17:46 +0000 Subject: [PATCH 1/3] arm64: enable pci resource mapping using sysfs Message-ID: <1489598266.86622.12.camel@infradead.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Brijesh Singh To support pci resource mapping from userspace, pci_mmap_page_range implementation must be done for that platform. This support was broken for arm64. This patch copies existing implementation from arm to enable sysfs mmap. [dwmw2: Add WC support] Reviewed-by: Erik Quanstrom Reviewed-by: Anthony Liguori Signed-off-by: Brijesh Singh Signed-off-by: David Woodhouse --- arch/arm64/include/asm/pci.h | 4 ++++ arch/arm64/kernel/pci.c | 19 +++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h index b9a7ba9..f73734f 100644 --- a/arch/arm64/include/asm/pci.h +++ b/arch/arm64/include/asm/pci.h @@ -37,5 +37,9 @@ static inline int pci_proc_domain(struct pci_bus *bus) } #endif /* CONFIG_PCI */ +#define HAVE_PCI_MMAP +extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, + enum pci_mmap_state mmap_state, int write_combine); + #endif /* __KERNEL__ */ #endif /* __ASM_PCI_H */ diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index 4f0e3eb..a9b6542 100644 --- a/arch/arm64/kernel/pci.c +++ b/arch/arm64/kernel/pci.c @@ -228,3 +228,22 @@ void pcibios_remove_bus(struct pci_bus *bus) } #endif + +int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, + enum pci_mmap_state mmap_state, int write_combine) +{ + if (mmap_state == pci_mmap_io) + return -EINVAL; + + if (write_combine) + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); + else + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, + vma->vm_end - vma->vm_start, + vma->vm_page_prot)) + return -EAGAIN; + + return 0; +} -- dwmw2 -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 4938 bytes Desc: not available URL: