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drivers/xen/xen-pciback/pciback.h
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/* * PCI Backend Common Data Structures & Function Declarations * * Author: Ryan Wilson <hap9@epoch.ncsc.mil> */ #ifndef __XEN_PCIBACK_H__ #define __XEN_PCIBACK_H__ #include <linux/pci.h> #include <linux/interrupt.h> #include <xen/xenbus.h> #include <linux/list.h> #include <linux/spinlock.h> #include <linux/workqueue.h> |
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#include <linux/atomic.h> |
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#include <xen/interface/io/pciif.h> |
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#define DRV_NAME "xen-pciback" |
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struct pci_dev_entry { struct list_head list; struct pci_dev *dev; }; |
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#define _PDEVF_op_active (0) #define PDEVF_op_active (1<<(_PDEVF_op_active)) |
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#define _PCIB_op_pending (1) #define PCIB_op_pending (1<<(_PCIB_op_pending)) |
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struct xen_pcibk_device { |
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void *pci_dev_data; |
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struct mutex dev_lock; |
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struct xenbus_device *xdev; |
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struct xenbus_watch be_watch; u8 be_watching; |
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int evtchn_irq; |
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struct xen_pci_sharedinfo *sh_info; |
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unsigned long flags; |
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struct work_struct op_work; }; |
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struct xen_pcibk_dev_data { |
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struct list_head config_fields; |
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unsigned int permissive:1; unsigned int warned_on_write:1; unsigned int enable_intx:1; unsigned int isr_on:1; /* Whether the IRQ handler is installed. */ unsigned int ack_intr:1; /* .. and ACK-ing */ unsigned long handled; unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */ |
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char irq_name[0]; /* xen-pcibk[000:04:00.0] */ |
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}; |
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/* Used by XenBus and xen_pcibk_ops.c */ extern wait_queue_head_t xen_pcibk_aer_wait_queue; extern struct workqueue_struct *xen_pcibk_wq; |
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/* Used by pcistub.c and conf_space_quirks.c */ |
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extern struct list_head xen_pcibk_quirks; |
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/* Get/Put PCI Devices that are hidden from the PCI Backend Domain */ |
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struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, |
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int domain, int bus, int slot, int func); |
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struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev, |
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struct pci_dev *dev); void pcistub_put_pci_dev(struct pci_dev *dev); /* Ensure a device is turned off or reset */ |
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void xen_pcibk_reset_device(struct pci_dev *pdev); |
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/* Access a virtual configuration space for a PCI device */ |
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int xen_pcibk_config_init(void); int xen_pcibk_config_init_dev(struct pci_dev *dev); void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev); void xen_pcibk_config_reset_dev(struct pci_dev *dev); void xen_pcibk_config_free_dev(struct pci_dev *dev); int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size, u32 *ret_val); int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value); |
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/* Handle requests for specific devices from the frontend */ |
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typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev, |
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unsigned int domain, unsigned int bus, unsigned int devfn, unsigned int devid); |
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typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev, |
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unsigned int domain, unsigned int bus); |
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/* Backend registration for the two types of BDF representation: * vpci - BDFs start at 00 * passthrough - BDFs are exactly like in the host. */ struct xen_pcibk_backend { |
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const char *name; |
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int (*init)(struct xen_pcibk_device *pdev); void (*free)(struct xen_pcibk_device *pdev); int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev, unsigned int *domain, unsigned int *bus, unsigned int *devfn); int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb); void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev); int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev, int devid, publish_pci_dev_cb publish_cb); struct pci_dev *(*get)(struct xen_pcibk_device *pdev, unsigned int domain, unsigned int bus, unsigned int devfn); }; |
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extern const struct xen_pcibk_backend xen_pcibk_vpci_backend; extern const struct xen_pcibk_backend xen_pcibk_passthrough_backend; extern const struct xen_pcibk_backend *xen_pcibk_backend; |
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static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, struct pci_dev *dev, int devid, publish_pci_dev_cb publish_cb) { if (xen_pcibk_backend && xen_pcibk_backend->add) return xen_pcibk_backend->add(pdev, dev, devid, publish_cb); return -1; |
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} |
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static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev, struct pci_dev *dev) { if (xen_pcibk_backend && xen_pcibk_backend->free) return xen_pcibk_backend->release(pdev, dev); |
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} |
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static inline struct pci_dev * xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain, unsigned int bus, unsigned int devfn) { if (xen_pcibk_backend && xen_pcibk_backend->get) return xen_pcibk_backend->get(pdev, domain, bus, devfn); return NULL; |
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} |
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/** |
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* Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk |
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* before sending aer request to pcifront, so that guest could identify |
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* device, coopearte with xen_pcibk to finish aer recovery job if device driver |
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* has the capability */ |
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static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev, struct xen_pcibk_device *pdev, unsigned int *domain, unsigned int *bus, unsigned int *devfn) { if (xen_pcibk_backend && xen_pcibk_backend->find) return xen_pcibk_backend->find(pcidev, pdev, domain, bus, devfn); return -1; |
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} |
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static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev) { if (xen_pcibk_backend && xen_pcibk_backend->init) return xen_pcibk_backend->init(pdev); return -1; |
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} |
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static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev, publish_pci_root_cb cb) { if (xen_pcibk_backend && xen_pcibk_backend->publish) return xen_pcibk_backend->publish(pdev, cb); return -1; |
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} |
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static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev) { if (xen_pcibk_backend && xen_pcibk_backend->free) return xen_pcibk_backend->free(pdev); |
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} |
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/* Handles events from front-end */ |
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irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id); void xen_pcibk_do_op(struct work_struct *data); |
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int xen_pcibk_xenbus_register(void); void xen_pcibk_xenbus_unregister(void); |
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extern int verbose_request; |
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void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev); |
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#endif |
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/* Handles shared IRQs that can to device domain and control domain. */ |
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void xen_pcibk_irq_handler(struct pci_dev *dev, int reset); |