// SPDX-License-Identifier: GPL-2.0-only /* * Mediated virtual PCI serial host device driver * * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. * Author: Neo Jia <[email protected]> * Kirti Wankhede <[email protected]> * * Sample driver that creates mdev device that simulates serial port over PCI * card. */ #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/cdev.h> #include <linux/sched.h> #include <linux/wait.h> #include <linux/vfio.h> #include <linux/iommu.h> #include <linux/sysfs.h> #include <linux/ctype.h> #include <linux/file.h> #include <linux/mdev.h> #include <linux/pci.h> #include <linux/serial.h> #include <uapi/linux/serial_reg.h> #include <linux/eventfd.h> #include <linux/anon_inodes.h> /* * #defines */ #define VERSION_STRING … #define DRIVER_AUTHOR … #define MTTY_CLASS_NAME … #define MTTY_NAME … #define MTTY_STRING_LEN … #define MTTY_CONFIG_SPACE_SIZE … #define MTTY_IO_BAR_SIZE … #define MTTY_MMIO_BAR_SIZE … #define STORE_LE16(addr, val) … #define STORE_LE32(addr, val) … #define MAX_FIFO_SIZE … #define CIRCULAR_BUF_INC_IDX(idx) … #define MTTY_VFIO_PCI_OFFSET_SHIFT … #define MTTY_VFIO_PCI_OFFSET_TO_INDEX(off) … #define MTTY_VFIO_PCI_INDEX_TO_OFFSET(index) … #define MTTY_VFIO_PCI_OFFSET_MASK … #define MAX_MTTYS … /* * Global Structures */ static struct mtty_dev { … } mtty_dev; struct mdev_region_info { … }; #if defined(DEBUG_REGS) static const char *wr_reg[] = { "TX", "IER", "FCR", "LCR", "MCR", "LSR", "MSR", "SCR" }; static const char *rd_reg[] = { "RX", "IER", "IIR", "LCR", "MCR", "LSR", "MSR", "SCR" }; #endif /* loop back buffer */ struct rxtx { … }; struct serial_port { … }; struct mtty_data { … }; struct mdev_state; struct mtty_migration_file { … }; /* State of each mdev device */ struct mdev_state { … }; static struct mtty_type { … } mtty_types[2] = …; static struct mdev_type *mtty_mdev_types[] = …; static atomic_t mdev_avail_ports = …; static const struct file_operations vd_fops = …; static const struct vfio_device_ops mtty_dev_ops; /* Helper functions */ static void dump_buffer(u8 *buf, uint32_t count) { … } static bool is_intx(struct mdev_state *mdev_state) { … } static bool is_msi(struct mdev_state *mdev_state) { … } static bool is_noirq(struct mdev_state *mdev_state) { … } static void mtty_trigger_interrupt(struct mdev_state *mdev_state) { … } static void mtty_create_config_space(struct mdev_state *mdev_state) { … } static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, u8 *buf, u32 count) { … } static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state, u16 offset, u8 *buf, u32 count) { … } static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state, u16 offset, u8 *buf, u32 count) { … } static void mdev_read_base(struct mdev_state *mdev_state) { … } static ssize_t mdev_access(struct mdev_state *mdev_state, u8 *buf, size_t count, loff_t pos, bool is_write) { … } static size_t mtty_data_size(struct mdev_state *mdev_state) { … } static void mtty_disable_file(struct mtty_migration_file *migf) { … } static void mtty_disable_files(struct mdev_state *mdev_state) { … } static void mtty_state_mutex_unlock(struct mdev_state *mdev_state) { … } static int mtty_release_migf(struct inode *inode, struct file *filp) { … } static long mtty_precopy_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { … } static ssize_t mtty_save_read(struct file *filp, char __user *buf, size_t len, loff_t *pos) { … } static const struct file_operations mtty_save_fops = …; static void mtty_save_state(struct mdev_state *mdev_state) { … } static int mtty_load_state(struct mdev_state *mdev_state) { … } static struct mtty_migration_file * mtty_save_device_data(struct mdev_state *mdev_state, enum vfio_device_mig_state state) { … } static ssize_t mtty_resume_write(struct file *filp, const char __user *buf, size_t len, loff_t *pos) { … } static const struct file_operations mtty_resume_fops = …; static struct mtty_migration_file * mtty_resume_device_data(struct mdev_state *mdev_state) { … } static struct file *mtty_step_state(struct mdev_state *mdev_state, enum vfio_device_mig_state new) { … } static struct file *mtty_set_state(struct vfio_device *vdev, enum vfio_device_mig_state new_state) { … } static int mtty_get_state(struct vfio_device *vdev, enum vfio_device_mig_state *current_state) { … } static int mtty_get_data_size(struct vfio_device *vdev, unsigned long *stop_copy_length) { … } static const struct vfio_migration_ops mtty_migration_ops = …; static int mtty_log_start(struct vfio_device *vdev, struct rb_root_cached *ranges, u32 nnodes, u64 *page_size) { … } static int mtty_log_stop(struct vfio_device *vdev) { … } static int mtty_log_read_and_clear(struct vfio_device *vdev, unsigned long iova, unsigned long length, struct iova_bitmap *dirty) { … } static const struct vfio_log_ops mtty_log_ops = …; static int mtty_init_dev(struct vfio_device *vdev) { … } static int mtty_probe(struct mdev_device *mdev) { … } static void mtty_release_dev(struct vfio_device *vdev) { … } static void mtty_remove(struct mdev_device *mdev) { … } static int mtty_reset(struct mdev_state *mdev_state) { … } static ssize_t mtty_read(struct vfio_device *vdev, char __user *buf, size_t count, loff_t *ppos) { … } static ssize_t mtty_write(struct vfio_device *vdev, const char __user *buf, size_t count, loff_t *ppos) { … } static void mtty_disable_intx(struct mdev_state *mdev_state) { … } static void mtty_disable_msi(struct mdev_state *mdev_state) { … } static int mtty_set_irqs(struct mdev_state *mdev_state, uint32_t flags, unsigned int index, unsigned int start, unsigned int count, void *data) { … } static int mtty_get_region_info(struct mdev_state *mdev_state, struct vfio_region_info *region_info, u16 *cap_type_id, void **cap_type) { … } static int mtty_get_irq_info(struct vfio_irq_info *irq_info) { … } static int mtty_get_device_info(struct vfio_device_info *dev_info) { … } static long mtty_ioctl(struct vfio_device *vdev, unsigned int cmd, unsigned long arg) { … } static ssize_t sample_mdev_dev_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(sample_mdev_dev); static struct attribute *mdev_dev_attrs[] = …; static const struct attribute_group mdev_dev_group = …; static const struct attribute_group *mdev_dev_groups[] = …; static unsigned int mtty_get_available(struct mdev_type *mtype) { … } static void mtty_close(struct vfio_device *vdev) { … } static const struct vfio_device_ops mtty_dev_ops = …; static struct mdev_driver mtty_driver = …; static void mtty_device_release(struct device *dev) { … } static int __init mtty_dev_init(void) { … } static void __exit mtty_dev_exit(void) { … } module_init(…) … module_exit(…) MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_VERSION(…); MODULE_AUTHOR(…);
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