/* * Copyright (C) 2013 - Virtual Open Systems * Author: Antonios Motakis * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2, as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #ifndef VFIO_PLATFORM_PRIVATE_H #define VFIO_PLATFORM_PRIVATE_H #include #include #define VFIO_PLATFORM_OFFSET_SHIFT 40 #define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1) #define VFIO_PLATFORM_OFFSET_TO_INDEX(off) \ (off >> VFIO_PLATFORM_OFFSET_SHIFT) #define VFIO_PLATFORM_INDEX_TO_OFFSET(index) \ ((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT) struct vfio_platform_irq { u32 flags; u32 count; int hwirq; char *name; struct eventfd_ctx *trigger; bool masked; spinlock_t lock; struct virqfd *unmask; struct virqfd *mask; }; struct vfio_platform_region { u64 addr; resource_size_t size; u32 flags; u32 type; #define VFIO_PLATFORM_REGION_TYPE_MMIO 1 #define VFIO_PLATFORM_REGION_TYPE_PIO 2 void __iomem *ioaddr; }; struct vfio_platform_device { struct vfio_platform_region *regions; u32 num_regions; struct vfio_platform_irq *irqs; u32 num_irqs; int refcnt; struct mutex igate; struct module *parent_module; const char *compat; const char *acpihid; struct module *reset_module; struct device *device; /* * These fields should be filled by the bus specific binder */ void *opaque; const char *name; uint32_t flags; /* callbacks to discover device resources */ struct resource* (*get_resource)(struct vfio_platform_device *vdev, int i); int (*get_irq)(struct vfio_platform_device *vdev, int i); int (*of_reset)(struct vfio_platform_device *vdev); bool reset_required; }; typedef int (*vfio_platform_reset_fn_t)(struct vfio_platform_device *vdev); struct vfio_platform_reset_node { struct list_head link; char *compat; struct module *owner; vfio_platform_reset_fn_t of_reset; }; extern int vfio_platform_probe_common(struct vfio_platform_device *vdev, struct device *dev); extern struct vfio_platform_device *vfio_platform_remove_common (struct device *dev); extern int vfio_platform_irq_init(struct vfio_platform_device *vdev); extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev); extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev, uint32_t flags, unsigned index, unsigned start, unsigned count, void *data); extern void __vfio_platform_register_reset(struct vfio_platform_reset_node *n); extern void vfio_platform_unregister_reset(const char *compat, vfio_platform_reset_fn_t fn); #define vfio_platform_register_reset(__compat, __reset) \ static struct vfio_platform_reset_node __reset ## _node = { \ .owner = THIS_MODULE, \ .compat = __compat, \ .of_reset = __reset, \ }; \ __vfio_platform_register_reset(&__reset ## _node) #define module_vfio_reset_handler(compat, reset) \ MODULE_ALIAS("vfio-reset:" compat); \ static int __init reset ## _module_init(void) \ { \ vfio_platform_register_reset(compat, reset); \ return 0; \ }; \ static void __exit reset ## _module_exit(void) \ { \ vfio_platform_unregister_reset(compat, reset); \ }; \ module_init(reset ## _module_init); \ module_exit(reset ## _module_exit) #endif /* VFIO_PLATFORM_PRIVATE_H */ /option>space: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 /sound/sparc/dbri.c
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 'sound/sparc/dbri.c')