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c3fc3e098b
Introduce APIs to execute legacy IO admin commands. It includes: io_legacy_read/write for both common and the device configuration, io_legacy_notify_info. In addition, exposing an API to check whether the legacy IO commands are supported. (i.e. virtio_pci_admin_has_legacy_io()). Those APIs will be used by the next patches from this series. Note: Unlike modern drivers which support hardware virtio devices, legacy drivers assume software-based devices: e.g. they don't use proper memory barriers on ARM, use big endian on PPC, etc. X86 drivers are mostly ok though, more or less by chance. For now, only support legacy IO on X86. Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yishai Hadas <yishaih@nvidia.com> Link: https://lore.kernel.org/r/20231219093247.170936-7-yishaih@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
24 lines
843 B
C
24 lines
843 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VIRTIO_PCI_ADMIN_H
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#define _LINUX_VIRTIO_PCI_ADMIN_H
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#include <linux/types.h>
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#include <linux/pci.h>
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#ifdef CONFIG_VIRTIO_PCI_ADMIN_LEGACY
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bool virtio_pci_admin_has_legacy_io(struct pci_dev *pdev);
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int virtio_pci_admin_legacy_common_io_write(struct pci_dev *pdev, u8 offset,
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u8 size, u8 *buf);
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int virtio_pci_admin_legacy_common_io_read(struct pci_dev *pdev, u8 offset,
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u8 size, u8 *buf);
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int virtio_pci_admin_legacy_device_io_write(struct pci_dev *pdev, u8 offset,
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u8 size, u8 *buf);
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int virtio_pci_admin_legacy_device_io_read(struct pci_dev *pdev, u8 offset,
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u8 size, u8 *buf);
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int virtio_pci_admin_legacy_io_notify_info(struct pci_dev *pdev,
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u8 req_bar_flags, u8 *bar,
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u64 *bar_offset);
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#endif
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#endif /* _LINUX_VIRTIO_PCI_ADMIN_H */
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