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a37c0191ac
To add a bit of vendor flexibility with various virtio based devices, allow the caller to check for a different device id. This adds a function pointer field to struct virtio_pci_modern_device to specify an override device id check. If defined by the driver, this function will be called to check that the PCI device is the vendor's expected device, and will return the found device id to be stored in mdev->id.device. This allows vendors with alternative vendor device ids to use this library on their own device BAR. Note: A lot of the diff in this is simply indenting the existing code into an else block. Signed-off-by: Shannon Nelson <shannon.nelson@amd.com> Acked-by: Jason Wang <jasowang@redhat.com> Message-Id: <20230519215632.12343-2-shannon.nelson@amd.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VIRTIO_PCI_MODERN_H
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#define _LINUX_VIRTIO_PCI_MODERN_H
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#include <linux/pci.h>
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#include <linux/virtio_pci.h>
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struct virtio_pci_modern_common_cfg {
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struct virtio_pci_common_cfg cfg;
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__le16 queue_notify_data; /* read-write */
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__le16 queue_reset; /* read-write */
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};
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struct virtio_pci_modern_device {
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struct pci_dev *pci_dev;
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struct virtio_pci_common_cfg __iomem *common;
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/* Device-specific data (non-legacy mode) */
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void __iomem *device;
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/* Base of vq notifications (non-legacy mode). */
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void __iomem *notify_base;
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/* Physical base of vq notifications */
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resource_size_t notify_pa;
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/* Where to read and clear interrupt */
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u8 __iomem *isr;
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/* So we can sanity-check accesses. */
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size_t notify_len;
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size_t device_len;
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/* Capability for when we need to map notifications per-vq. */
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int notify_map_cap;
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/* Multiply queue_notify_off by this value. (non-legacy mode). */
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u32 notify_offset_multiplier;
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int modern_bars;
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struct virtio_device_id id;
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/* optional check for vendor virtio device, returns dev_id or -ERRNO */
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int (*device_id_check)(struct pci_dev *pdev);
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};
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/*
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* Type-safe wrappers for io accesses.
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* Use these to enforce at compile time the following spec requirement:
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*
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* The driver MUST access each field using the “natural” access
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* method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
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* for 16-bit fields and 8-bit accesses for 8-bit fields.
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*/
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static inline u8 vp_ioread8(const u8 __iomem *addr)
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{
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return ioread8(addr);
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}
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static inline u16 vp_ioread16 (const __le16 __iomem *addr)
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{
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return ioread16(addr);
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}
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static inline u32 vp_ioread32(const __le32 __iomem *addr)
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{
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return ioread32(addr);
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}
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static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
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{
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iowrite8(value, addr);
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}
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static inline void vp_iowrite16(u16 value, __le16 __iomem *addr)
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{
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iowrite16(value, addr);
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}
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static inline void vp_iowrite32(u32 value, __le32 __iomem *addr)
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{
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iowrite32(value, addr);
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}
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static inline void vp_iowrite64_twopart(u64 val,
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__le32 __iomem *lo,
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__le32 __iomem *hi)
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{
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vp_iowrite32((u32)val, lo);
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vp_iowrite32(val >> 32, hi);
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}
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u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev);
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u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev);
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void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
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u64 features);
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u32 vp_modern_generation(struct virtio_pci_modern_device *mdev);
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u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev);
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void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
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u8 status);
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u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
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u16 idx, u16 vector);
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u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
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u16 vector);
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void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
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u16 index, u64 desc_addr, u64 driver_addr,
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u64 device_addr);
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void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
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u16 idx, bool enable);
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bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
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u16 idx);
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void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
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u16 idx, u16 size);
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u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
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u16 idx);
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u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev);
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void __iomem * vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
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u16 index, resource_size_t *pa);
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int vp_modern_probe(struct virtio_pci_modern_device *mdev);
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void vp_modern_remove(struct virtio_pci_modern_device *mdev);
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int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
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void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
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#endif
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