#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H #define _ASM_ARM_XEN_PAGE_COHERENT_H #include #include void __xen_dma_map_page(struct device *hwdev, struct page *page, dma_addr_t dev_addr, unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long attrs); void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir, unsigned long attrs); void __xen_dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir); void __xen_dma_sync_single_for_device(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir); static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs) { return __generic_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs); } static inline void xen_free_coherent_pages(struct device *hwdev, size_t size, void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs) { __generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs); } static inline void xen_dma_map_page(struct device *hwdev, struct page *page, dma_addr_t dev_addr, unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long attrs) { unsigned long page_pfn = page_to_xen_pfn(page); unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr); unsigned long compound_pages = (1<map_page(hwdev, page, offset, size, dir, attrs); else __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs); } static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { unsigned long pfn = PFN_DOWN(handle); /* * Dom0 is mapped 1:1, while the Linux page can be spanned accross * multiple Xen page, it's not possible to have a mix of local and * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a * foreign mfn will always return false. If the page is local we can * safely call the native dma_ops function, otherwise we call the xen * specific function. */ if (pfn_valid(pfn)) { if (__generic_dma_ops(hwdev)->unmap_page) __generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs); } else __xen_dma_unmap_page(hwdev, handle, size, dir, attrs); } static inline void xen_dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { unsigned long pfn = PFN_DOWN(handle); if (pfn_valid(pfn)) { if (__generic_dma_ops(hwdev)->sync_single_for_cpu) __generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir); } else __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir); } static inline void xen_dma_sync_single_for_device(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { unsigned long pfn = PFN_DOWN(handle); if (pfn_valid(pfn)) { if (__generic_dma_ops(hwdev)->sync_single_for_device) __generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir); } else __xen_dma_sync_single_for_device(hwdev, handle, size, dir); } #endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */ 5'>25space:mode:
authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /include/net/phonet
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'include/net/phonet')