1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * PCI Backend Common Data Structures & Function Declarations 4 * 5 * Author: Ryan Wilson <hap9@epoch.ncsc.mil> 6 */ 7 #ifndef __XEN_PCIBACK_H__ 8 #define __XEN_PCIBACK_H__ 9 10 #include <linux/pci.h> 11 #include <linux/interrupt.h> 12 #include <xen/xenbus.h> 13 #include <linux/list.h> 14 #include <linux/spinlock.h> 15 #include <linux/workqueue.h> 16 #include <linux/atomic.h> 17 #include <xen/events.h> 18 #include <xen/interface/io/pciif.h> 19 20 #define DRV_NAME "xen-pciback" 21 22 struct pci_dev_entry { 23 struct list_head list; 24 struct pci_dev *dev; 25 }; 26 27 #define _PDEVF_op_active (0) 28 #define PDEVF_op_active (1<<(_PDEVF_op_active)) 29 #define _PCIB_op_pending (1) 30 #define PCIB_op_pending (1<<(_PCIB_op_pending)) 31 #define _EOI_pending (2) 32 #define EOI_pending (1<<(_EOI_pending)) 33 34 struct xen_pcibk_device { 35 void *pci_dev_data; 36 struct mutex dev_lock; 37 struct xenbus_device *xdev; 38 struct xenbus_watch be_watch; 39 u8 be_watching; 40 int evtchn_irq; 41 struct xen_pci_sharedinfo *sh_info; 42 unsigned long flags; 43 struct work_struct op_work; 44 struct xen_pci_op op; 45 }; 46 47 struct xen_pcibk_dev_data { 48 struct list_head config_fields; 49 struct pci_saved_state *pci_saved_state; 50 unsigned int permissive:1; 51 unsigned int allow_interrupt_control:1; 52 unsigned int warned_on_write:1; 53 unsigned int enable_intx:1; 54 unsigned int isr_on:1; /* Whether the IRQ handler is installed. */ 55 unsigned int ack_intr:1; /* .. and ACK-ing */ 56 unsigned long handled; 57 unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */ 58 char irq_name[]; /* xen-pcibk[000:04:00.0] */ 59 }; 60 61 /* Used by XenBus and xen_pcibk_ops.c */ 62 extern wait_queue_head_t xen_pcibk_aer_wait_queue; 63 /* Used by pcistub.c and conf_space_quirks.c */ 64 extern struct list_head xen_pcibk_quirks; 65 66 /* Get/Put PCI Devices that are hidden from the PCI Backend Domain */ 67 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, 68 int domain, int bus, 69 int slot, int func); 70 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev, 71 struct pci_dev *dev); 72 void pcistub_put_pci_dev(struct pci_dev *dev); 73 74 static inline bool xen_pcibk_pv_support(void) 75 { 76 return IS_ENABLED(CONFIG_XEN_PCIDEV_BACKEND); 77 } 78 79 /* Ensure a device is turned off or reset */ 80 void xen_pcibk_reset_device(struct pci_dev *pdev); 81 82 /* Access a virtual configuration space for a PCI device */ 83 int xen_pcibk_config_init(void); 84 int xen_pcibk_config_init_dev(struct pci_dev *dev); 85 void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev); 86 void xen_pcibk_config_reset_dev(struct pci_dev *dev); 87 void xen_pcibk_config_free_dev(struct pci_dev *dev); 88 int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size, 89 u32 *ret_val); 90 int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, 91 u32 value); 92 93 /* Handle requests for specific devices from the frontend */ 94 typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev, 95 unsigned int domain, unsigned int bus, 96 unsigned int devfn, unsigned int devid); 97 typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev, 98 unsigned int domain, unsigned int bus); 99 100 /* Backend registration for the two types of BDF representation: 101 * vpci - BDFs start at 00 102 * passthrough - BDFs are exactly like in the host. 103 */ 104 struct xen_pcibk_backend { 105 const char *name; 106 int (*init)(struct xen_pcibk_device *pdev); 107 void (*free)(struct xen_pcibk_device *pdev); 108 int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev, 109 unsigned int *domain, unsigned int *bus, 110 unsigned int *devfn); 111 int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb); 112 void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev, 113 bool lock); 114 int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev, 115 int devid, publish_pci_dev_cb publish_cb); 116 struct pci_dev *(*get)(struct xen_pcibk_device *pdev, 117 unsigned int domain, unsigned int bus, 118 unsigned int devfn); 119 }; 120 121 extern const struct xen_pcibk_backend xen_pcibk_vpci_backend; 122 extern const struct xen_pcibk_backend xen_pcibk_passthrough_backend; 123 extern const struct xen_pcibk_backend *xen_pcibk_backend; 124 125 static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, 126 struct pci_dev *dev, 127 int devid, 128 publish_pci_dev_cb publish_cb) 129 { 130 if (xen_pcibk_backend && xen_pcibk_backend->add) 131 return xen_pcibk_backend->add(pdev, dev, devid, publish_cb); 132 return -1; 133 } 134 135 static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev, 136 struct pci_dev *dev, bool lock) 137 { 138 if (xen_pcibk_backend && xen_pcibk_backend->release) 139 return xen_pcibk_backend->release(pdev, dev, lock); 140 } 141 142 static inline struct pci_dev * 143 xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain, 144 unsigned int bus, unsigned int devfn) 145 { 146 if (xen_pcibk_backend && xen_pcibk_backend->get) 147 return xen_pcibk_backend->get(pdev, domain, bus, devfn); 148 return NULL; 149 } 150 151 /** 152 * Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk 153 * before sending aer request to pcifront, so that guest could identify 154 * device, coopearte with xen_pcibk to finish aer recovery job if device driver 155 * has the capability 156 */ 157 static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev, 158 struct xen_pcibk_device *pdev, 159 unsigned int *domain, 160 unsigned int *bus, 161 unsigned int *devfn) 162 { 163 if (xen_pcibk_backend && xen_pcibk_backend->find) 164 return xen_pcibk_backend->find(pcidev, pdev, domain, bus, 165 devfn); 166 return -1; 167 } 168 169 static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev) 170 { 171 if (xen_pcibk_backend && xen_pcibk_backend->init) 172 return xen_pcibk_backend->init(pdev); 173 return -1; 174 } 175 176 static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev, 177 publish_pci_root_cb cb) 178 { 179 if (xen_pcibk_backend && xen_pcibk_backend->publish) 180 return xen_pcibk_backend->publish(pdev, cb); 181 return -1; 182 } 183 184 static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev) 185 { 186 if (xen_pcibk_backend && xen_pcibk_backend->free) 187 return xen_pcibk_backend->free(pdev); 188 } 189 190 /* Handles events from front-end */ 191 irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id); 192 void xen_pcibk_do_op(struct work_struct *data); 193 194 static inline void xen_pcibk_lateeoi(struct xen_pcibk_device *pdev, 195 unsigned int eoi_flag) 196 { 197 if (test_and_clear_bit(_EOI_pending, &pdev->flags)) 198 xen_irq_lateeoi(pdev->evtchn_irq, eoi_flag); 199 } 200 201 int xen_pcibk_xenbus_register(void); 202 void xen_pcibk_xenbus_unregister(void); 203 #endif 204 205 /* Handles shared IRQs that can to device domain and control domain. */ 206 void xen_pcibk_irq_handler(struct pci_dev *dev, int reset); 207