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![Sinan Kaya](/assets/img/avatar_default.png)
The code was allowing platform devices to be used without a supporting VFIO reset driver. The hardware can be left in some inconsistent state after a guest machine abort. The reset driver will put the hardware back to safe state and disable interrupts before returning the control back to the host machine. Adding a new reset_required kernel module option to platform VFIO drivers. The default value is true for the DT and ACPI based drivers. The reset requirement value for AMBA drivers is set to false and is unchangeable to maintain the existing functionality. New requirements are: 1. A reset function needs to be implemented by the corresponding driver via DT/ACPI. 2. The reset function needs to be discovered via DT/ACPI. The probe of the driver will fail if any of the above conditions are not satisfied. Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
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* Copyright (C) 2013 - Virtual Open Systems
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* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef VFIO_PLATFORM_PRIVATE_H
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#define VFIO_PLATFORM_PRIVATE_H
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#define VFIO_PLATFORM_OFFSET_SHIFT 40
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#define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1)
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#define VFIO_PLATFORM_OFFSET_TO_INDEX(off) \
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(off >> VFIO_PLATFORM_OFFSET_SHIFT)
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#define VFIO_PLATFORM_INDEX_TO_OFFSET(index) \
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((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT)
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struct vfio_platform_irq {
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u32 flags;
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u32 count;
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int hwirq;
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char *name;
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struct eventfd_ctx *trigger;
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bool masked;
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spinlock_t lock;
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struct virqfd *unmask;
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struct virqfd *mask;
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};
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struct vfio_platform_region {
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u64 addr;
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resource_size_t size;
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u32 flags;
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u32 type;
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#define VFIO_PLATFORM_REGION_TYPE_MMIO 1
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#define VFIO_PLATFORM_REGION_TYPE_PIO 2
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void __iomem *ioaddr;
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};
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struct vfio_platform_device {
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struct vfio_platform_region *regions;
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u32 num_regions;
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struct vfio_platform_irq *irqs;
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u32 num_irqs;
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int refcnt;
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struct mutex igate;
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struct module *parent_module;
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const char *compat;
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const char *acpihid;
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struct module *reset_module;
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struct device *device;
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/*
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* These fields should be filled by the bus specific binder
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*/
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void *opaque;
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const char *name;
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uint32_t flags;
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/* callbacks to discover device resources */
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struct resource*
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(*get_resource)(struct vfio_platform_device *vdev, int i);
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int (*get_irq)(struct vfio_platform_device *vdev, int i);
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int (*of_reset)(struct vfio_platform_device *vdev);
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bool reset_required;
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};
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typedef int (*vfio_platform_reset_fn_t)(struct vfio_platform_device *vdev);
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struct vfio_platform_reset_node {
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struct list_head link;
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char *compat;
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struct module *owner;
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vfio_platform_reset_fn_t of_reset;
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};
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extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
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struct device *dev);
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extern struct vfio_platform_device *vfio_platform_remove_common
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(struct device *dev);
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extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
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extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
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extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
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uint32_t flags, unsigned index,
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unsigned start, unsigned count,
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void *data);
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extern void __vfio_platform_register_reset(struct vfio_platform_reset_node *n);
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extern void vfio_platform_unregister_reset(const char *compat,
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vfio_platform_reset_fn_t fn);
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#define vfio_platform_register_reset(__compat, __reset) \
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static struct vfio_platform_reset_node __reset ## _node = { \
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.owner = THIS_MODULE, \
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.compat = __compat, \
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.of_reset = __reset, \
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}; \
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__vfio_platform_register_reset(&__reset ## _node)
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#define module_vfio_reset_handler(compat, reset) \
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MODULE_ALIAS("vfio-reset:" compat); \
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static int __init reset ## _module_init(void) \
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{ \
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vfio_platform_register_reset(compat, reset); \
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return 0; \
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}; \
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static void __exit reset ## _module_exit(void) \
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{ \
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vfio_platform_unregister_reset(compat, reset); \
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}; \
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module_init(reset ## _module_init); \
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module_exit(reset ## _module_exit)
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#endif /* VFIO_PLATFORM_PRIVATE_H */
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