Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) Microsoft Corporation. |
| 3 | * |
| 4 | * Author: |
| 5 | * Jake Oshins <jakeo@microsoft.com> |
| 6 | * |
| 7 | * This driver acts as a paravirtual front-end for PCI Express root buses. |
| 8 | * When a PCI Express function (either an entire device or an SR-IOV |
| 9 | * Virtual Function) is being passed through to the VM, this driver exposes |
| 10 | * a new bus to the guest VM. This is modeled as a root PCI bus because |
| 11 | * no bridges are being exposed to the VM. In fact, with a "Generation 2" |
| 12 | * VM within Hyper-V, there may seem to be no PCI bus at all in the VM |
| 13 | * until a device as been exposed using this driver. |
| 14 | * |
| 15 | * Each root PCI bus has its own PCI domain, which is called "Segment" in |
| 16 | * the PCI Firmware Specifications. Thus while each device passed through |
| 17 | * to the VM using this front-end will appear at "device 0", the domain will |
| 18 | * be unique. Typically, each bus will have one PCI function on it, though |
| 19 | * this driver does support more than one. |
| 20 | * |
| 21 | * In order to map the interrupts from the device through to the guest VM, |
| 22 | * this driver also implements an IRQ Domain, which handles interrupts (either |
| 23 | * MSI or MSI-X) associated with the functions on the bus. As interrupts are |
| 24 | * set up, torn down, or reaffined, this driver communicates with the |
| 25 | * underlying hypervisor to adjust the mappings in the I/O MMU so that each |
| 26 | * interrupt will be delivered to the correct virtual processor at the right |
| 27 | * vector. This driver does not support level-triggered (line-based) |
| 28 | * interrupts, and will report that the Interrupt Line register in the |
| 29 | * function's configuration space is zero. |
| 30 | * |
| 31 | * The rest of this driver mostly maps PCI concepts onto underlying Hyper-V |
| 32 | * facilities. For instance, the configuration space of a function exposed |
| 33 | * by Hyper-V is mapped into a single page of memory space, and the |
| 34 | * read and write handlers for config space must be aware of this mechanism. |
| 35 | * Similarly, device setup and teardown involves messages sent to and from |
| 36 | * the PCI back-end driver in Hyper-V. |
| 37 | * |
| 38 | * This program is free software; you can redistribute it and/or modify it |
| 39 | * under the terms of the GNU General Public License version 2 as published |
| 40 | * by the Free Software Foundation. |
| 41 | * |
| 42 | * This program is distributed in the hope that it will be useful, but |
| 43 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 44 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 45 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 46 | * details. |
| 47 | * |
| 48 | */ |
| 49 | |
| 50 | #include <linux/kernel.h> |
| 51 | #include <linux/module.h> |
| 52 | #include <linux/pci.h> |
| 53 | #include <linux/semaphore.h> |
| 54 | #include <linux/irqdomain.h> |
Nicolai Stange | 8574df1 | 2018-07-29 12:15:33 +0200 | [diff] [blame] | 55 | #include <linux/irq.h> |
| 56 | |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 57 | #include <asm/irqdomain.h> |
| 58 | #include <asm/apic.h> |
| 59 | #include <linux/msi.h> |
| 60 | #include <linux/hyperv.h> |
| 61 | #include <asm/mshyperv.h> |
| 62 | |
| 63 | /* |
| 64 | * Protocol versions. The low word is the minor version, the high word the |
| 65 | * major version. |
| 66 | */ |
| 67 | |
| 68 | #define PCI_MAKE_VERSION(major, minor) ((u32)(((major) << 16) | (major))) |
| 69 | #define PCI_MAJOR_VERSION(version) ((u32)(version) >> 16) |
| 70 | #define PCI_MINOR_VERSION(version) ((u32)(version) & 0xff) |
| 71 | |
| 72 | enum { |
| 73 | PCI_PROTOCOL_VERSION_1_1 = PCI_MAKE_VERSION(1, 1), |
| 74 | PCI_PROTOCOL_VERSION_CURRENT = PCI_PROTOCOL_VERSION_1_1 |
| 75 | }; |
| 76 | |
K. Y. Srinivasan | 87e7dc9 | 2017-03-24 11:07:21 -0700 | [diff] [blame] | 77 | #define CPU_AFFINITY_ALL -1ULL |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 78 | #define PCI_CONFIG_MMIO_LENGTH 0x2000 |
| 79 | #define CFG_PAGE_OFFSET 0x1000 |
| 80 | #define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET) |
| 81 | |
| 82 | #define MAX_SUPPORTED_MSI_MESSAGES 0x400 |
| 83 | |
| 84 | /* |
| 85 | * Message Types |
| 86 | */ |
| 87 | |
| 88 | enum pci_message_type { |
| 89 | /* |
| 90 | * Version 1.1 |
| 91 | */ |
| 92 | PCI_MESSAGE_BASE = 0x42490000, |
| 93 | PCI_BUS_RELATIONS = PCI_MESSAGE_BASE + 0, |
| 94 | PCI_QUERY_BUS_RELATIONS = PCI_MESSAGE_BASE + 1, |
| 95 | PCI_POWER_STATE_CHANGE = PCI_MESSAGE_BASE + 4, |
| 96 | PCI_QUERY_RESOURCE_REQUIREMENTS = PCI_MESSAGE_BASE + 5, |
| 97 | PCI_QUERY_RESOURCE_RESOURCES = PCI_MESSAGE_BASE + 6, |
| 98 | PCI_BUS_D0ENTRY = PCI_MESSAGE_BASE + 7, |
| 99 | PCI_BUS_D0EXIT = PCI_MESSAGE_BASE + 8, |
| 100 | PCI_READ_BLOCK = PCI_MESSAGE_BASE + 9, |
| 101 | PCI_WRITE_BLOCK = PCI_MESSAGE_BASE + 0xA, |
| 102 | PCI_EJECT = PCI_MESSAGE_BASE + 0xB, |
| 103 | PCI_QUERY_STOP = PCI_MESSAGE_BASE + 0xC, |
| 104 | PCI_REENABLE = PCI_MESSAGE_BASE + 0xD, |
| 105 | PCI_QUERY_STOP_FAILED = PCI_MESSAGE_BASE + 0xE, |
| 106 | PCI_EJECTION_COMPLETE = PCI_MESSAGE_BASE + 0xF, |
| 107 | PCI_RESOURCES_ASSIGNED = PCI_MESSAGE_BASE + 0x10, |
| 108 | PCI_RESOURCES_RELEASED = PCI_MESSAGE_BASE + 0x11, |
| 109 | PCI_INVALIDATE_BLOCK = PCI_MESSAGE_BASE + 0x12, |
| 110 | PCI_QUERY_PROTOCOL_VERSION = PCI_MESSAGE_BASE + 0x13, |
| 111 | PCI_CREATE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x14, |
| 112 | PCI_DELETE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x15, |
| 113 | PCI_MESSAGE_MAXIMUM |
| 114 | }; |
| 115 | |
| 116 | /* |
| 117 | * Structures defining the virtual PCI Express protocol. |
| 118 | */ |
| 119 | |
| 120 | union pci_version { |
| 121 | struct { |
| 122 | u16 minor_version; |
| 123 | u16 major_version; |
| 124 | } parts; |
| 125 | u32 version; |
| 126 | } __packed; |
| 127 | |
| 128 | /* |
| 129 | * Function numbers are 8-bits wide on Express, as interpreted through ARI, |
| 130 | * which is all this driver does. This representation is the one used in |
| 131 | * Windows, which is what is expected when sending this back and forth with |
| 132 | * the Hyper-V parent partition. |
| 133 | */ |
| 134 | union win_slot_encoding { |
| 135 | struct { |
Dexuan Cui | bc5338a | 2017-02-10 15:18:46 -0600 | [diff] [blame] | 136 | u32 dev:5; |
| 137 | u32 func:3; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 138 | u32 reserved:24; |
| 139 | } bits; |
| 140 | u32 slot; |
| 141 | } __packed; |
| 142 | |
| 143 | /* |
| 144 | * Pretty much as defined in the PCI Specifications. |
| 145 | */ |
| 146 | struct pci_function_description { |
| 147 | u16 v_id; /* vendor ID */ |
| 148 | u16 d_id; /* device ID */ |
| 149 | u8 rev; |
| 150 | u8 prog_intf; |
| 151 | u8 subclass; |
| 152 | u8 base_class; |
| 153 | u32 subsystem_id; |
| 154 | union win_slot_encoding win_slot; |
| 155 | u32 ser; /* serial number */ |
| 156 | } __packed; |
| 157 | |
| 158 | /** |
| 159 | * struct hv_msi_desc |
| 160 | * @vector: IDT entry |
| 161 | * @delivery_mode: As defined in Intel's Programmer's |
| 162 | * Reference Manual, Volume 3, Chapter 8. |
| 163 | * @vector_count: Number of contiguous entries in the |
| 164 | * Interrupt Descriptor Table that are |
| 165 | * occupied by this Message-Signaled |
| 166 | * Interrupt. For "MSI", as first defined |
| 167 | * in PCI 2.2, this can be between 1 and |
| 168 | * 32. For "MSI-X," as first defined in PCI |
| 169 | * 3.0, this must be 1, as each MSI-X table |
| 170 | * entry would have its own descriptor. |
| 171 | * @reserved: Empty space |
| 172 | * @cpu_mask: All the target virtual processors. |
| 173 | */ |
| 174 | struct hv_msi_desc { |
| 175 | u8 vector; |
| 176 | u8 delivery_mode; |
| 177 | u16 vector_count; |
| 178 | u32 reserved; |
| 179 | u64 cpu_mask; |
| 180 | } __packed; |
| 181 | |
| 182 | /** |
| 183 | * struct tran_int_desc |
| 184 | * @reserved: unused, padding |
| 185 | * @vector_count: same as in hv_msi_desc |
| 186 | * @data: This is the "data payload" value that is |
| 187 | * written by the device when it generates |
| 188 | * a message-signaled interrupt, either MSI |
| 189 | * or MSI-X. |
| 190 | * @address: This is the address to which the data |
| 191 | * payload is written on interrupt |
| 192 | * generation. |
| 193 | */ |
| 194 | struct tran_int_desc { |
| 195 | u16 reserved; |
| 196 | u16 vector_count; |
| 197 | u32 data; |
| 198 | u64 address; |
| 199 | } __packed; |
| 200 | |
| 201 | /* |
| 202 | * A generic message format for virtual PCI. |
| 203 | * Specific message formats are defined later in the file. |
| 204 | */ |
| 205 | |
| 206 | struct pci_message { |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 207 | u32 type; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 208 | } __packed; |
| 209 | |
| 210 | struct pci_child_message { |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 211 | struct pci_message message_type; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 212 | union win_slot_encoding wslot; |
| 213 | } __packed; |
| 214 | |
| 215 | struct pci_incoming_message { |
| 216 | struct vmpacket_descriptor hdr; |
| 217 | struct pci_message message_type; |
| 218 | } __packed; |
| 219 | |
| 220 | struct pci_response { |
| 221 | struct vmpacket_descriptor hdr; |
| 222 | s32 status; /* negative values are failures */ |
| 223 | } __packed; |
| 224 | |
| 225 | struct pci_packet { |
| 226 | void (*completion_func)(void *context, struct pci_response *resp, |
| 227 | int resp_packet_size); |
| 228 | void *compl_ctxt; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 229 | |
| 230 | struct pci_message message[0]; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 231 | }; |
| 232 | |
| 233 | /* |
| 234 | * Specific message types supporting the PCI protocol. |
| 235 | */ |
| 236 | |
| 237 | /* |
| 238 | * Version negotiation message. Sent from the guest to the host. |
| 239 | * The guest is free to try different versions until the host |
| 240 | * accepts the version. |
| 241 | * |
| 242 | * pci_version: The protocol version requested. |
| 243 | * is_last_attempt: If TRUE, this is the last version guest will request. |
| 244 | * reservedz: Reserved field, set to zero. |
| 245 | */ |
| 246 | |
| 247 | struct pci_version_request { |
| 248 | struct pci_message message_type; |
| 249 | enum pci_message_type protocol_version; |
| 250 | } __packed; |
| 251 | |
| 252 | /* |
| 253 | * Bus D0 Entry. This is sent from the guest to the host when the virtual |
| 254 | * bus (PCI Express port) is ready for action. |
| 255 | */ |
| 256 | |
| 257 | struct pci_bus_d0_entry { |
| 258 | struct pci_message message_type; |
| 259 | u32 reserved; |
| 260 | u64 mmio_base; |
| 261 | } __packed; |
| 262 | |
| 263 | struct pci_bus_relations { |
| 264 | struct pci_incoming_message incoming; |
| 265 | u32 device_count; |
Dexuan Cui | 7d0f8ee | 2016-08-23 04:46:39 +0000 | [diff] [blame] | 266 | struct pci_function_description func[0]; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 267 | } __packed; |
| 268 | |
| 269 | struct pci_q_res_req_response { |
| 270 | struct vmpacket_descriptor hdr; |
| 271 | s32 status; /* negative values are failures */ |
| 272 | u32 probed_bar[6]; |
| 273 | } __packed; |
| 274 | |
| 275 | struct pci_set_power { |
| 276 | struct pci_message message_type; |
| 277 | union win_slot_encoding wslot; |
| 278 | u32 power_state; /* In Windows terms */ |
| 279 | u32 reserved; |
| 280 | } __packed; |
| 281 | |
| 282 | struct pci_set_power_response { |
| 283 | struct vmpacket_descriptor hdr; |
| 284 | s32 status; /* negative values are failures */ |
| 285 | union win_slot_encoding wslot; |
| 286 | u32 resultant_state; /* In Windows terms */ |
| 287 | u32 reserved; |
| 288 | } __packed; |
| 289 | |
| 290 | struct pci_resources_assigned { |
| 291 | struct pci_message message_type; |
| 292 | union win_slot_encoding wslot; |
| 293 | u8 memory_range[0x14][6]; /* not used here */ |
| 294 | u32 msi_descriptors; |
| 295 | u32 reserved[4]; |
| 296 | } __packed; |
| 297 | |
| 298 | struct pci_create_interrupt { |
| 299 | struct pci_message message_type; |
| 300 | union win_slot_encoding wslot; |
| 301 | struct hv_msi_desc int_desc; |
| 302 | } __packed; |
| 303 | |
| 304 | struct pci_create_int_response { |
| 305 | struct pci_response response; |
| 306 | u32 reserved; |
| 307 | struct tran_int_desc int_desc; |
| 308 | } __packed; |
| 309 | |
| 310 | struct pci_delete_interrupt { |
| 311 | struct pci_message message_type; |
| 312 | union win_slot_encoding wslot; |
| 313 | struct tran_int_desc int_desc; |
| 314 | } __packed; |
| 315 | |
| 316 | struct pci_dev_incoming { |
| 317 | struct pci_incoming_message incoming; |
| 318 | union win_slot_encoding wslot; |
| 319 | } __packed; |
| 320 | |
| 321 | struct pci_eject_response { |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 322 | struct pci_message message_type; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 323 | union win_slot_encoding wslot; |
| 324 | u32 status; |
| 325 | } __packed; |
| 326 | |
| 327 | static int pci_ring_size = (4 * PAGE_SIZE); |
| 328 | |
| 329 | /* |
| 330 | * Definitions or interrupt steering hypercall. |
| 331 | */ |
| 332 | #define HV_PARTITION_ID_SELF ((u64)-1) |
| 333 | #define HVCALL_RETARGET_INTERRUPT 0x7e |
| 334 | |
| 335 | struct retarget_msi_interrupt { |
| 336 | u64 partition_id; /* use "self" */ |
| 337 | u64 device_id; |
| 338 | u32 source; /* 1 for MSI(-X) */ |
| 339 | u32 reserved1; |
| 340 | u32 address; |
| 341 | u32 data; |
| 342 | u64 reserved2; |
| 343 | u32 vector; |
| 344 | u32 flags; |
| 345 | u64 vp_mask; |
| 346 | } __packed; |
| 347 | |
| 348 | /* |
| 349 | * Driver specific state. |
| 350 | */ |
| 351 | |
| 352 | enum hv_pcibus_state { |
| 353 | hv_pcibus_init = 0, |
| 354 | hv_pcibus_probed, |
| 355 | hv_pcibus_installed, |
Long Li | fd15bad | 2017-03-23 14:58:10 -0700 | [diff] [blame] | 356 | hv_pcibus_removed, |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 357 | hv_pcibus_maximum |
| 358 | }; |
| 359 | |
| 360 | struct hv_pcibus_device { |
| 361 | struct pci_sysdata sysdata; |
| 362 | enum hv_pcibus_state state; |
| 363 | atomic_t remove_lock; |
| 364 | struct hv_device *hdev; |
| 365 | resource_size_t low_mmio_space; |
| 366 | resource_size_t high_mmio_space; |
| 367 | struct resource *mem_config; |
| 368 | struct resource *low_mmio_res; |
| 369 | struct resource *high_mmio_res; |
| 370 | struct completion *survey_event; |
| 371 | struct completion remove_event; |
| 372 | struct pci_bus *pci_bus; |
| 373 | spinlock_t config_lock; /* Avoid two threads writing index page */ |
| 374 | spinlock_t device_list_lock; /* Protect lists below */ |
| 375 | void __iomem *cfg_addr; |
| 376 | |
| 377 | struct semaphore enum_sem; |
| 378 | struct list_head resources_for_children; |
| 379 | |
| 380 | struct list_head children; |
| 381 | struct list_head dr_list; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 382 | |
| 383 | struct msi_domain_info msi_info; |
| 384 | struct msi_controller msi_chip; |
| 385 | struct irq_domain *irq_domain; |
| 386 | }; |
| 387 | |
| 388 | /* |
| 389 | * Tracks "Device Relations" messages from the host, which must be both |
| 390 | * processed in order and deferred so that they don't run in the context |
| 391 | * of the incoming packet callback. |
| 392 | */ |
| 393 | struct hv_dr_work { |
| 394 | struct work_struct wrk; |
| 395 | struct hv_pcibus_device *bus; |
| 396 | }; |
| 397 | |
| 398 | struct hv_dr_state { |
| 399 | struct list_head list_entry; |
| 400 | u32 device_count; |
Dexuan Cui | 7d0f8ee | 2016-08-23 04:46:39 +0000 | [diff] [blame] | 401 | struct pci_function_description func[0]; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 402 | }; |
| 403 | |
| 404 | enum hv_pcichild_state { |
| 405 | hv_pcichild_init = 0, |
| 406 | hv_pcichild_requirements, |
| 407 | hv_pcichild_resourced, |
| 408 | hv_pcichild_ejecting, |
| 409 | hv_pcichild_maximum |
| 410 | }; |
| 411 | |
| 412 | enum hv_pcidev_ref_reason { |
| 413 | hv_pcidev_ref_invalid = 0, |
| 414 | hv_pcidev_ref_initial, |
| 415 | hv_pcidev_ref_by_slot, |
| 416 | hv_pcidev_ref_packet, |
| 417 | hv_pcidev_ref_pnp, |
| 418 | hv_pcidev_ref_childlist, |
| 419 | hv_pcidev_irqdata, |
| 420 | hv_pcidev_ref_max |
| 421 | }; |
| 422 | |
| 423 | struct hv_pci_dev { |
| 424 | /* List protected by pci_rescan_remove_lock */ |
| 425 | struct list_head list_entry; |
| 426 | atomic_t refs; |
| 427 | enum hv_pcichild_state state; |
| 428 | struct pci_function_description desc; |
| 429 | bool reported_missing; |
| 430 | struct hv_pcibus_device *hbus; |
| 431 | struct work_struct wrk; |
| 432 | |
| 433 | /* |
| 434 | * What would be observed if one wrote 0xFFFFFFFF to a BAR and then |
| 435 | * read it back, for each of the BAR offsets within config space. |
| 436 | */ |
| 437 | u32 probed_bar[6]; |
| 438 | }; |
| 439 | |
| 440 | struct hv_pci_compl { |
| 441 | struct completion host_event; |
| 442 | s32 completion_status; |
| 443 | }; |
| 444 | |
| 445 | /** |
| 446 | * hv_pci_generic_compl() - Invoked for a completion packet |
| 447 | * @context: Set up by the sender of the packet. |
| 448 | * @resp: The response packet |
| 449 | * @resp_packet_size: Size in bytes of the packet |
| 450 | * |
| 451 | * This function is used to trigger an event and report status |
| 452 | * for any message for which the completion packet contains a |
| 453 | * status and nothing else. |
| 454 | */ |
Dexuan Cui | a5b45b7 | 2016-08-23 04:49:22 +0000 | [diff] [blame] | 455 | static void hv_pci_generic_compl(void *context, struct pci_response *resp, |
| 456 | int resp_packet_size) |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 457 | { |
| 458 | struct hv_pci_compl *comp_pkt = context; |
| 459 | |
| 460 | if (resp_packet_size >= offsetofend(struct pci_response, status)) |
| 461 | comp_pkt->completion_status = resp->status; |
Dexuan Cui | a5b45b7 | 2016-08-23 04:49:22 +0000 | [diff] [blame] | 462 | else |
| 463 | comp_pkt->completion_status = -1; |
| 464 | |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 465 | complete(&comp_pkt->host_event); |
| 466 | } |
| 467 | |
| 468 | static struct hv_pci_dev *get_pcichild_wslot(struct hv_pcibus_device *hbus, |
| 469 | u32 wslot); |
| 470 | static void get_pcichild(struct hv_pci_dev *hv_pcidev, |
| 471 | enum hv_pcidev_ref_reason reason); |
| 472 | static void put_pcichild(struct hv_pci_dev *hv_pcidev, |
| 473 | enum hv_pcidev_ref_reason reason); |
| 474 | |
| 475 | static void get_hvpcibus(struct hv_pcibus_device *hv_pcibus); |
| 476 | static void put_hvpcibus(struct hv_pcibus_device *hv_pcibus); |
| 477 | |
| 478 | /** |
| 479 | * devfn_to_wslot() - Convert from Linux PCI slot to Windows |
| 480 | * @devfn: The Linux representation of PCI slot |
| 481 | * |
| 482 | * Windows uses a slightly different representation of PCI slot. |
| 483 | * |
| 484 | * Return: The Windows representation |
| 485 | */ |
| 486 | static u32 devfn_to_wslot(int devfn) |
| 487 | { |
| 488 | union win_slot_encoding wslot; |
| 489 | |
| 490 | wslot.slot = 0; |
Dexuan Cui | bc5338a | 2017-02-10 15:18:46 -0600 | [diff] [blame] | 491 | wslot.bits.dev = PCI_SLOT(devfn); |
| 492 | wslot.bits.func = PCI_FUNC(devfn); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 493 | |
| 494 | return wslot.slot; |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * wslot_to_devfn() - Convert from Windows PCI slot to Linux |
| 499 | * @wslot: The Windows representation of PCI slot |
| 500 | * |
| 501 | * Windows uses a slightly different representation of PCI slot. |
| 502 | * |
| 503 | * Return: The Linux representation |
| 504 | */ |
| 505 | static int wslot_to_devfn(u32 wslot) |
| 506 | { |
| 507 | union win_slot_encoding slot_no; |
| 508 | |
| 509 | slot_no.slot = wslot; |
Dexuan Cui | bc5338a | 2017-02-10 15:18:46 -0600 | [diff] [blame] | 510 | return PCI_DEVFN(slot_no.bits.dev, slot_no.bits.func); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | /* |
| 514 | * PCI Configuration Space for these root PCI buses is implemented as a pair |
| 515 | * of pages in memory-mapped I/O space. Writing to the first page chooses |
| 516 | * the PCI function being written or read. Once the first page has been |
| 517 | * written to, the following page maps in the entire configuration space of |
| 518 | * the function. |
| 519 | */ |
| 520 | |
| 521 | /** |
| 522 | * _hv_pcifront_read_config() - Internal PCI config read |
| 523 | * @hpdev: The PCI driver's representation of the device |
| 524 | * @where: Offset within config space |
| 525 | * @size: Size of the transfer |
| 526 | * @val: Pointer to the buffer receiving the data |
| 527 | */ |
| 528 | static void _hv_pcifront_read_config(struct hv_pci_dev *hpdev, int where, |
| 529 | int size, u32 *val) |
| 530 | { |
| 531 | unsigned long flags; |
| 532 | void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET + where; |
| 533 | |
| 534 | /* |
| 535 | * If the attempt is to read the IDs or the ROM BAR, simulate that. |
| 536 | */ |
| 537 | if (where + size <= PCI_COMMAND) { |
| 538 | memcpy(val, ((u8 *)&hpdev->desc.v_id) + where, size); |
| 539 | } else if (where >= PCI_CLASS_REVISION && where + size <= |
| 540 | PCI_CACHE_LINE_SIZE) { |
| 541 | memcpy(val, ((u8 *)&hpdev->desc.rev) + where - |
| 542 | PCI_CLASS_REVISION, size); |
| 543 | } else if (where >= PCI_SUBSYSTEM_VENDOR_ID && where + size <= |
| 544 | PCI_ROM_ADDRESS) { |
| 545 | memcpy(val, (u8 *)&hpdev->desc.subsystem_id + where - |
| 546 | PCI_SUBSYSTEM_VENDOR_ID, size); |
| 547 | } else if (where >= PCI_ROM_ADDRESS && where + size <= |
| 548 | PCI_CAPABILITY_LIST) { |
| 549 | /* ROM BARs are unimplemented */ |
| 550 | *val = 0; |
| 551 | } else if (where >= PCI_INTERRUPT_LINE && where + size <= |
| 552 | PCI_INTERRUPT_PIN) { |
| 553 | /* |
| 554 | * Interrupt Line and Interrupt PIN are hard-wired to zero |
| 555 | * because this front-end only supports message-signaled |
| 556 | * interrupts. |
| 557 | */ |
| 558 | *val = 0; |
| 559 | } else if (where + size <= CFG_PAGE_SIZE) { |
| 560 | spin_lock_irqsave(&hpdev->hbus->config_lock, flags); |
| 561 | /* Choose the function to be read. (See comment above) */ |
| 562 | writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr); |
Vitaly Kuznetsov | bdd7444 | 2016-05-03 14:22:00 +0200 | [diff] [blame] | 563 | /* Make sure the function was chosen before we start reading. */ |
| 564 | mb(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 565 | /* Read from that function's config space. */ |
| 566 | switch (size) { |
| 567 | case 1: |
| 568 | *val = readb(addr); |
| 569 | break; |
| 570 | case 2: |
| 571 | *val = readw(addr); |
| 572 | break; |
| 573 | default: |
| 574 | *val = readl(addr); |
| 575 | break; |
| 576 | } |
Vitaly Kuznetsov | bdd7444 | 2016-05-03 14:22:00 +0200 | [diff] [blame] | 577 | /* |
| 578 | * Make sure the write was done before we release the spinlock |
| 579 | * allowing consecutive reads/writes. |
| 580 | */ |
| 581 | mb(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 582 | spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags); |
| 583 | } else { |
| 584 | dev_err(&hpdev->hbus->hdev->device, |
| 585 | "Attempt to read beyond a function's config space.\n"); |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | /** |
| 590 | * _hv_pcifront_write_config() - Internal PCI config write |
| 591 | * @hpdev: The PCI driver's representation of the device |
| 592 | * @where: Offset within config space |
| 593 | * @size: Size of the transfer |
| 594 | * @val: The data being transferred |
| 595 | */ |
| 596 | static void _hv_pcifront_write_config(struct hv_pci_dev *hpdev, int where, |
| 597 | int size, u32 val) |
| 598 | { |
| 599 | unsigned long flags; |
| 600 | void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET + where; |
| 601 | |
| 602 | if (where >= PCI_SUBSYSTEM_VENDOR_ID && |
| 603 | where + size <= PCI_CAPABILITY_LIST) { |
| 604 | /* SSIDs and ROM BARs are read-only */ |
| 605 | } else if (where >= PCI_COMMAND && where + size <= CFG_PAGE_SIZE) { |
| 606 | spin_lock_irqsave(&hpdev->hbus->config_lock, flags); |
| 607 | /* Choose the function to be written. (See comment above) */ |
| 608 | writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr); |
Vitaly Kuznetsov | bdd7444 | 2016-05-03 14:22:00 +0200 | [diff] [blame] | 609 | /* Make sure the function was chosen before we start writing. */ |
| 610 | wmb(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 611 | /* Write to that function's config space. */ |
| 612 | switch (size) { |
| 613 | case 1: |
| 614 | writeb(val, addr); |
| 615 | break; |
| 616 | case 2: |
| 617 | writew(val, addr); |
| 618 | break; |
| 619 | default: |
| 620 | writel(val, addr); |
| 621 | break; |
| 622 | } |
Vitaly Kuznetsov | bdd7444 | 2016-05-03 14:22:00 +0200 | [diff] [blame] | 623 | /* |
| 624 | * Make sure the write was done before we release the spinlock |
| 625 | * allowing consecutive reads/writes. |
| 626 | */ |
| 627 | mb(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 628 | spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags); |
| 629 | } else { |
| 630 | dev_err(&hpdev->hbus->hdev->device, |
| 631 | "Attempt to write beyond a function's config space.\n"); |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | /** |
| 636 | * hv_pcifront_read_config() - Read configuration space |
| 637 | * @bus: PCI Bus structure |
| 638 | * @devfn: Device/function |
| 639 | * @where: Offset from base |
| 640 | * @size: Byte/word/dword |
| 641 | * @val: Value to be read |
| 642 | * |
| 643 | * Return: PCIBIOS_SUCCESSFUL on success |
| 644 | * PCIBIOS_DEVICE_NOT_FOUND on failure |
| 645 | */ |
| 646 | static int hv_pcifront_read_config(struct pci_bus *bus, unsigned int devfn, |
| 647 | int where, int size, u32 *val) |
| 648 | { |
| 649 | struct hv_pcibus_device *hbus = |
| 650 | container_of(bus->sysdata, struct hv_pcibus_device, sysdata); |
| 651 | struct hv_pci_dev *hpdev; |
| 652 | |
| 653 | hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(devfn)); |
| 654 | if (!hpdev) |
| 655 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 656 | |
| 657 | _hv_pcifront_read_config(hpdev, where, size, val); |
| 658 | |
| 659 | put_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 660 | return PCIBIOS_SUCCESSFUL; |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * hv_pcifront_write_config() - Write configuration space |
| 665 | * @bus: PCI Bus structure |
| 666 | * @devfn: Device/function |
| 667 | * @where: Offset from base |
| 668 | * @size: Byte/word/dword |
| 669 | * @val: Value to be written to device |
| 670 | * |
| 671 | * Return: PCIBIOS_SUCCESSFUL on success |
| 672 | * PCIBIOS_DEVICE_NOT_FOUND on failure |
| 673 | */ |
| 674 | static int hv_pcifront_write_config(struct pci_bus *bus, unsigned int devfn, |
| 675 | int where, int size, u32 val) |
| 676 | { |
| 677 | struct hv_pcibus_device *hbus = |
| 678 | container_of(bus->sysdata, struct hv_pcibus_device, sysdata); |
| 679 | struct hv_pci_dev *hpdev; |
| 680 | |
| 681 | hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(devfn)); |
| 682 | if (!hpdev) |
| 683 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 684 | |
| 685 | _hv_pcifront_write_config(hpdev, where, size, val); |
| 686 | |
| 687 | put_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 688 | return PCIBIOS_SUCCESSFUL; |
| 689 | } |
| 690 | |
| 691 | /* PCIe operations */ |
| 692 | static struct pci_ops hv_pcifront_ops = { |
| 693 | .read = hv_pcifront_read_config, |
| 694 | .write = hv_pcifront_write_config, |
| 695 | }; |
| 696 | |
| 697 | /* Interrupt management hooks */ |
| 698 | static void hv_int_desc_free(struct hv_pci_dev *hpdev, |
| 699 | struct tran_int_desc *int_desc) |
| 700 | { |
| 701 | struct pci_delete_interrupt *int_pkt; |
| 702 | struct { |
| 703 | struct pci_packet pkt; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 704 | u8 buffer[sizeof(struct pci_delete_interrupt)]; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 705 | } ctxt; |
| 706 | |
| 707 | memset(&ctxt, 0, sizeof(ctxt)); |
| 708 | int_pkt = (struct pci_delete_interrupt *)&ctxt.pkt.message; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 709 | int_pkt->message_type.type = |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 710 | PCI_DELETE_INTERRUPT_MESSAGE; |
| 711 | int_pkt->wslot.slot = hpdev->desc.win_slot.slot; |
| 712 | int_pkt->int_desc = *int_desc; |
| 713 | vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt, sizeof(*int_pkt), |
| 714 | (unsigned long)&ctxt.pkt, VM_PKT_DATA_INBAND, 0); |
| 715 | kfree(int_desc); |
| 716 | } |
| 717 | |
| 718 | /** |
| 719 | * hv_msi_free() - Free the MSI. |
| 720 | * @domain: The interrupt domain pointer |
| 721 | * @info: Extra MSI-related context |
| 722 | * @irq: Identifies the IRQ. |
| 723 | * |
| 724 | * The Hyper-V parent partition and hypervisor are tracking the |
| 725 | * messages that are in use, keeping the interrupt redirection |
| 726 | * table up to date. This callback sends a message that frees |
| 727 | * the IRT entry and related tracking nonsense. |
| 728 | */ |
| 729 | static void hv_msi_free(struct irq_domain *domain, struct msi_domain_info *info, |
| 730 | unsigned int irq) |
| 731 | { |
| 732 | struct hv_pcibus_device *hbus; |
| 733 | struct hv_pci_dev *hpdev; |
| 734 | struct pci_dev *pdev; |
| 735 | struct tran_int_desc *int_desc; |
| 736 | struct irq_data *irq_data = irq_domain_get_irq_data(domain, irq); |
| 737 | struct msi_desc *msi = irq_data_get_msi_desc(irq_data); |
| 738 | |
| 739 | pdev = msi_desc_to_pci_dev(msi); |
| 740 | hbus = info->data; |
Cathy Avery | 0c6e617 | 2016-07-12 11:31:24 -0400 | [diff] [blame] | 741 | int_desc = irq_data_get_irq_chip_data(irq_data); |
| 742 | if (!int_desc) |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 743 | return; |
| 744 | |
Cathy Avery | 0c6e617 | 2016-07-12 11:31:24 -0400 | [diff] [blame] | 745 | irq_data->chip_data = NULL; |
| 746 | hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn)); |
| 747 | if (!hpdev) { |
| 748 | kfree(int_desc); |
| 749 | return; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 750 | } |
| 751 | |
Cathy Avery | 0c6e617 | 2016-07-12 11:31:24 -0400 | [diff] [blame] | 752 | hv_int_desc_free(hpdev, int_desc); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 753 | put_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 754 | } |
| 755 | |
| 756 | static int hv_set_affinity(struct irq_data *data, const struct cpumask *dest, |
| 757 | bool force) |
| 758 | { |
| 759 | struct irq_data *parent = data->parent_data; |
| 760 | |
| 761 | return parent->chip->irq_set_affinity(parent, dest, force); |
| 762 | } |
| 763 | |
| 764 | void hv_irq_mask(struct irq_data *data) |
| 765 | { |
| 766 | pci_msi_mask_irq(data); |
| 767 | } |
| 768 | |
| 769 | /** |
| 770 | * hv_irq_unmask() - "Unmask" the IRQ by setting its current |
| 771 | * affinity. |
| 772 | * @data: Describes the IRQ |
| 773 | * |
| 774 | * Build new a destination for the MSI and make a hypercall to |
| 775 | * update the Interrupt Redirection Table. "Device Logical ID" |
| 776 | * is built out of this PCI bus's instance GUID and the function |
| 777 | * number of the device. |
| 778 | */ |
| 779 | void hv_irq_unmask(struct irq_data *data) |
| 780 | { |
| 781 | struct msi_desc *msi_desc = irq_data_get_msi_desc(data); |
| 782 | struct irq_cfg *cfg = irqd_cfg(data); |
| 783 | struct retarget_msi_interrupt params; |
| 784 | struct hv_pcibus_device *hbus; |
| 785 | struct cpumask *dest; |
| 786 | struct pci_bus *pbus; |
| 787 | struct pci_dev *pdev; |
| 788 | int cpu; |
| 789 | |
| 790 | dest = irq_data_get_affinity_mask(data); |
| 791 | pdev = msi_desc_to_pci_dev(msi_desc); |
| 792 | pbus = pdev->bus; |
| 793 | hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata); |
| 794 | |
| 795 | memset(¶ms, 0, sizeof(params)); |
| 796 | params.partition_id = HV_PARTITION_ID_SELF; |
| 797 | params.source = 1; /* MSI(-X) */ |
| 798 | params.address = msi_desc->msg.address_lo; |
| 799 | params.data = msi_desc->msg.data; |
| 800 | params.device_id = (hbus->hdev->dev_instance.b[5] << 24) | |
| 801 | (hbus->hdev->dev_instance.b[4] << 16) | |
| 802 | (hbus->hdev->dev_instance.b[7] << 8) | |
| 803 | (hbus->hdev->dev_instance.b[6] & 0xf8) | |
| 804 | PCI_FUNC(pdev->devfn); |
| 805 | params.vector = cfg->vector; |
| 806 | |
| 807 | for_each_cpu_and(cpu, dest, cpu_online_mask) |
| 808 | params.vp_mask |= (1ULL << vmbus_cpu_number_to_vp_number(cpu)); |
| 809 | |
| 810 | hv_do_hypercall(HVCALL_RETARGET_INTERRUPT, ¶ms, NULL); |
| 811 | |
| 812 | pci_msi_unmask_irq(data); |
| 813 | } |
| 814 | |
| 815 | struct compose_comp_ctxt { |
| 816 | struct hv_pci_compl comp_pkt; |
| 817 | struct tran_int_desc int_desc; |
| 818 | }; |
| 819 | |
| 820 | static void hv_pci_compose_compl(void *context, struct pci_response *resp, |
| 821 | int resp_packet_size) |
| 822 | { |
| 823 | struct compose_comp_ctxt *comp_pkt = context; |
| 824 | struct pci_create_int_response *int_resp = |
| 825 | (struct pci_create_int_response *)resp; |
| 826 | |
| 827 | comp_pkt->comp_pkt.completion_status = resp->status; |
| 828 | comp_pkt->int_desc = int_resp->int_desc; |
| 829 | complete(&comp_pkt->comp_pkt.host_event); |
| 830 | } |
| 831 | |
| 832 | /** |
| 833 | * hv_compose_msi_msg() - Supplies a valid MSI address/data |
| 834 | * @data: Everything about this MSI |
| 835 | * @msg: Buffer that is filled in by this function |
| 836 | * |
| 837 | * This function unpacks the IRQ looking for target CPU set, IDT |
| 838 | * vector and mode and sends a message to the parent partition |
| 839 | * asking for a mapping for that tuple in this partition. The |
| 840 | * response supplies a data value and address to which that data |
| 841 | * should be written to trigger that interrupt. |
| 842 | */ |
| 843 | static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) |
| 844 | { |
| 845 | struct irq_cfg *cfg = irqd_cfg(data); |
| 846 | struct hv_pcibus_device *hbus; |
| 847 | struct hv_pci_dev *hpdev; |
| 848 | struct pci_bus *pbus; |
| 849 | struct pci_dev *pdev; |
| 850 | struct pci_create_interrupt *int_pkt; |
| 851 | struct compose_comp_ctxt comp; |
| 852 | struct tran_int_desc *int_desc; |
| 853 | struct cpumask *affinity; |
| 854 | struct { |
| 855 | struct pci_packet pkt; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 856 | u8 buffer[sizeof(struct pci_create_interrupt)]; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 857 | } ctxt; |
| 858 | int cpu; |
| 859 | int ret; |
| 860 | |
| 861 | pdev = msi_desc_to_pci_dev(irq_data_get_msi_desc(data)); |
| 862 | pbus = pdev->bus; |
| 863 | hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata); |
| 864 | hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn)); |
| 865 | if (!hpdev) |
| 866 | goto return_null_message; |
| 867 | |
| 868 | /* Free any previous message that might have already been composed. */ |
| 869 | if (data->chip_data) { |
| 870 | int_desc = data->chip_data; |
| 871 | data->chip_data = NULL; |
| 872 | hv_int_desc_free(hpdev, int_desc); |
| 873 | } |
| 874 | |
K. Y. Srinivasan | d1d63f9 | 2017-03-24 11:07:22 -0700 | [diff] [blame] | 875 | int_desc = kzalloc(sizeof(*int_desc), GFP_ATOMIC); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 876 | if (!int_desc) |
| 877 | goto drop_reference; |
| 878 | |
| 879 | memset(&ctxt, 0, sizeof(ctxt)); |
| 880 | init_completion(&comp.comp_pkt.host_event); |
| 881 | ctxt.pkt.completion_func = hv_pci_compose_compl; |
| 882 | ctxt.pkt.compl_ctxt = ∁ |
| 883 | int_pkt = (struct pci_create_interrupt *)&ctxt.pkt.message; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 884 | int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 885 | int_pkt->wslot.slot = hpdev->desc.win_slot.slot; |
| 886 | int_pkt->int_desc.vector = cfg->vector; |
| 887 | int_pkt->int_desc.vector_count = 1; |
| 888 | int_pkt->int_desc.delivery_mode = |
| 889 | (apic->irq_delivery_mode == dest_LowestPrio) ? 1 : 0; |
| 890 | |
| 891 | /* |
| 892 | * This bit doesn't have to work on machines with more than 64 |
| 893 | * processors because Hyper-V only supports 64 in a guest. |
| 894 | */ |
| 895 | affinity = irq_data_get_affinity_mask(data); |
K. Y. Srinivasan | 87e7dc9 | 2017-03-24 11:07:21 -0700 | [diff] [blame] | 896 | if (cpumask_weight(affinity) >= 32) { |
| 897 | int_pkt->int_desc.cpu_mask = CPU_AFFINITY_ALL; |
| 898 | } else { |
| 899 | for_each_cpu_and(cpu, affinity, cpu_online_mask) { |
| 900 | int_pkt->int_desc.cpu_mask |= |
| 901 | (1ULL << vmbus_cpu_number_to_vp_number(cpu)); |
| 902 | } |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 903 | } |
| 904 | |
| 905 | ret = vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt, |
| 906 | sizeof(*int_pkt), (unsigned long)&ctxt.pkt, |
| 907 | VM_PKT_DATA_INBAND, |
| 908 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
Dexuan Cui | 665e224 | 2016-08-23 04:48:11 +0000 | [diff] [blame] | 909 | if (ret) |
| 910 | goto free_int_desc; |
| 911 | |
| 912 | wait_for_completion(&comp.comp_pkt.host_event); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 913 | |
| 914 | if (comp.comp_pkt.completion_status < 0) { |
| 915 | dev_err(&hbus->hdev->device, |
| 916 | "Request for interrupt failed: 0x%x", |
| 917 | comp.comp_pkt.completion_status); |
| 918 | goto free_int_desc; |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * Record the assignment so that this can be unwound later. Using |
| 923 | * irq_set_chip_data() here would be appropriate, but the lock it takes |
| 924 | * is already held. |
| 925 | */ |
| 926 | *int_desc = comp.int_desc; |
| 927 | data->chip_data = int_desc; |
| 928 | |
| 929 | /* Pass up the result. */ |
| 930 | msg->address_hi = comp.int_desc.address >> 32; |
| 931 | msg->address_lo = comp.int_desc.address & 0xffffffff; |
| 932 | msg->data = comp.int_desc.data; |
| 933 | |
| 934 | put_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 935 | return; |
| 936 | |
| 937 | free_int_desc: |
| 938 | kfree(int_desc); |
| 939 | drop_reference: |
| 940 | put_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 941 | return_null_message: |
| 942 | msg->address_hi = 0; |
| 943 | msg->address_lo = 0; |
| 944 | msg->data = 0; |
| 945 | } |
| 946 | |
| 947 | /* HW Interrupt Chip Descriptor */ |
| 948 | static struct irq_chip hv_msi_irq_chip = { |
| 949 | .name = "Hyper-V PCIe MSI", |
| 950 | .irq_compose_msi_msg = hv_compose_msi_msg, |
| 951 | .irq_set_affinity = hv_set_affinity, |
| 952 | .irq_ack = irq_chip_ack_parent, |
| 953 | .irq_mask = hv_irq_mask, |
| 954 | .irq_unmask = hv_irq_unmask, |
| 955 | }; |
| 956 | |
| 957 | static irq_hw_number_t hv_msi_domain_ops_get_hwirq(struct msi_domain_info *info, |
| 958 | msi_alloc_info_t *arg) |
| 959 | { |
| 960 | return arg->msi_hwirq; |
| 961 | } |
| 962 | |
| 963 | static struct msi_domain_ops hv_msi_ops = { |
| 964 | .get_hwirq = hv_msi_domain_ops_get_hwirq, |
| 965 | .msi_prepare = pci_msi_prepare, |
| 966 | .set_desc = pci_msi_set_desc, |
| 967 | .msi_free = hv_msi_free, |
| 968 | }; |
| 969 | |
| 970 | /** |
| 971 | * hv_pcie_init_irq_domain() - Initialize IRQ domain |
| 972 | * @hbus: The root PCI bus |
| 973 | * |
| 974 | * This function creates an IRQ domain which will be used for |
| 975 | * interrupts from devices that have been passed through. These |
| 976 | * devices only support MSI and MSI-X, not line-based interrupts |
| 977 | * or simulations of line-based interrupts through PCIe's |
| 978 | * fabric-layer messages. Because interrupts are remapped, we |
| 979 | * can support multi-message MSI here. |
| 980 | * |
| 981 | * Return: '0' on success and error value on failure |
| 982 | */ |
| 983 | static int hv_pcie_init_irq_domain(struct hv_pcibus_device *hbus) |
| 984 | { |
| 985 | hbus->msi_info.chip = &hv_msi_irq_chip; |
| 986 | hbus->msi_info.ops = &hv_msi_ops; |
| 987 | hbus->msi_info.flags = (MSI_FLAG_USE_DEF_DOM_OPS | |
| 988 | MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_MULTI_PCI_MSI | |
| 989 | MSI_FLAG_PCI_MSIX); |
| 990 | hbus->msi_info.handler = handle_edge_irq; |
| 991 | hbus->msi_info.handler_name = "edge"; |
| 992 | hbus->msi_info.data = hbus; |
| 993 | hbus->irq_domain = pci_msi_create_irq_domain(hbus->sysdata.fwnode, |
| 994 | &hbus->msi_info, |
| 995 | x86_vector_domain); |
| 996 | if (!hbus->irq_domain) { |
| 997 | dev_err(&hbus->hdev->device, |
| 998 | "Failed to build an MSI IRQ domain\n"); |
| 999 | return -ENODEV; |
| 1000 | } |
| 1001 | |
| 1002 | return 0; |
| 1003 | } |
| 1004 | |
| 1005 | /** |
| 1006 | * get_bar_size() - Get the address space consumed by a BAR |
| 1007 | * @bar_val: Value that a BAR returned after -1 was written |
| 1008 | * to it. |
| 1009 | * |
| 1010 | * This function returns the size of the BAR, rounded up to 1 |
| 1011 | * page. It has to be rounded up because the hypervisor's page |
| 1012 | * table entry that maps the BAR into the VM can't specify an |
| 1013 | * offset within a page. The invariant is that the hypervisor |
| 1014 | * must place any BARs of smaller than page length at the |
| 1015 | * beginning of a page. |
| 1016 | * |
| 1017 | * Return: Size in bytes of the consumed MMIO space. |
| 1018 | */ |
| 1019 | static u64 get_bar_size(u64 bar_val) |
| 1020 | { |
| 1021 | return round_up((1 + ~(bar_val & PCI_BASE_ADDRESS_MEM_MASK)), |
| 1022 | PAGE_SIZE); |
| 1023 | } |
| 1024 | |
| 1025 | /** |
| 1026 | * survey_child_resources() - Total all MMIO requirements |
| 1027 | * @hbus: Root PCI bus, as understood by this driver |
| 1028 | */ |
| 1029 | static void survey_child_resources(struct hv_pcibus_device *hbus) |
| 1030 | { |
| 1031 | struct list_head *iter; |
| 1032 | struct hv_pci_dev *hpdev; |
| 1033 | resource_size_t bar_size = 0; |
| 1034 | unsigned long flags; |
| 1035 | struct completion *event; |
| 1036 | u64 bar_val; |
| 1037 | int i; |
| 1038 | |
| 1039 | /* If nobody is waiting on the answer, don't compute it. */ |
| 1040 | event = xchg(&hbus->survey_event, NULL); |
| 1041 | if (!event) |
| 1042 | return; |
| 1043 | |
| 1044 | /* If the answer has already been computed, go with it. */ |
| 1045 | if (hbus->low_mmio_space || hbus->high_mmio_space) { |
| 1046 | complete(event); |
| 1047 | return; |
| 1048 | } |
| 1049 | |
| 1050 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1051 | |
| 1052 | /* |
| 1053 | * Due to an interesting quirk of the PCI spec, all memory regions |
| 1054 | * for a child device are a power of 2 in size and aligned in memory, |
| 1055 | * so it's sufficient to just add them up without tracking alignment. |
| 1056 | */ |
| 1057 | list_for_each(iter, &hbus->children) { |
| 1058 | hpdev = container_of(iter, struct hv_pci_dev, list_entry); |
| 1059 | for (i = 0; i < 6; i++) { |
| 1060 | if (hpdev->probed_bar[i] & PCI_BASE_ADDRESS_SPACE_IO) |
| 1061 | dev_err(&hbus->hdev->device, |
| 1062 | "There's an I/O BAR in this list!\n"); |
| 1063 | |
| 1064 | if (hpdev->probed_bar[i] != 0) { |
| 1065 | /* |
| 1066 | * A probed BAR has all the upper bits set that |
| 1067 | * can be changed. |
| 1068 | */ |
| 1069 | |
| 1070 | bar_val = hpdev->probed_bar[i]; |
| 1071 | if (bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64) |
| 1072 | bar_val |= |
| 1073 | ((u64)hpdev->probed_bar[++i] << 32); |
| 1074 | else |
| 1075 | bar_val |= 0xffffffff00000000ULL; |
| 1076 | |
| 1077 | bar_size = get_bar_size(bar_val); |
| 1078 | |
| 1079 | if (bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64) |
| 1080 | hbus->high_mmio_space += bar_size; |
| 1081 | else |
| 1082 | hbus->low_mmio_space += bar_size; |
| 1083 | } |
| 1084 | } |
| 1085 | } |
| 1086 | |
| 1087 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1088 | complete(event); |
| 1089 | } |
| 1090 | |
| 1091 | /** |
| 1092 | * prepopulate_bars() - Fill in BARs with defaults |
| 1093 | * @hbus: Root PCI bus, as understood by this driver |
| 1094 | * |
| 1095 | * The core PCI driver code seems much, much happier if the BARs |
| 1096 | * for a device have values upon first scan. So fill them in. |
| 1097 | * The algorithm below works down from large sizes to small, |
| 1098 | * attempting to pack the assignments optimally. The assumption, |
| 1099 | * enforced in other parts of the code, is that the beginning of |
| 1100 | * the memory-mapped I/O space will be aligned on the largest |
| 1101 | * BAR size. |
| 1102 | */ |
| 1103 | static void prepopulate_bars(struct hv_pcibus_device *hbus) |
| 1104 | { |
| 1105 | resource_size_t high_size = 0; |
| 1106 | resource_size_t low_size = 0; |
| 1107 | resource_size_t high_base = 0; |
| 1108 | resource_size_t low_base = 0; |
| 1109 | resource_size_t bar_size; |
| 1110 | struct hv_pci_dev *hpdev; |
| 1111 | struct list_head *iter; |
| 1112 | unsigned long flags; |
| 1113 | u64 bar_val; |
| 1114 | u32 command; |
| 1115 | bool high; |
| 1116 | int i; |
| 1117 | |
| 1118 | if (hbus->low_mmio_space) { |
| 1119 | low_size = 1ULL << (63 - __builtin_clzll(hbus->low_mmio_space)); |
| 1120 | low_base = hbus->low_mmio_res->start; |
| 1121 | } |
| 1122 | |
| 1123 | if (hbus->high_mmio_space) { |
| 1124 | high_size = 1ULL << |
| 1125 | (63 - __builtin_clzll(hbus->high_mmio_space)); |
| 1126 | high_base = hbus->high_mmio_res->start; |
| 1127 | } |
| 1128 | |
| 1129 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1130 | |
| 1131 | /* Pick addresses for the BARs. */ |
| 1132 | do { |
| 1133 | list_for_each(iter, &hbus->children) { |
| 1134 | hpdev = container_of(iter, struct hv_pci_dev, |
| 1135 | list_entry); |
| 1136 | for (i = 0; i < 6; i++) { |
| 1137 | bar_val = hpdev->probed_bar[i]; |
| 1138 | if (bar_val == 0) |
| 1139 | continue; |
| 1140 | high = bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64; |
| 1141 | if (high) { |
| 1142 | bar_val |= |
| 1143 | ((u64)hpdev->probed_bar[i + 1] |
| 1144 | << 32); |
| 1145 | } else { |
| 1146 | bar_val |= 0xffffffffULL << 32; |
| 1147 | } |
| 1148 | bar_size = get_bar_size(bar_val); |
| 1149 | if (high) { |
| 1150 | if (high_size != bar_size) { |
| 1151 | i++; |
| 1152 | continue; |
| 1153 | } |
| 1154 | _hv_pcifront_write_config(hpdev, |
| 1155 | PCI_BASE_ADDRESS_0 + (4 * i), |
| 1156 | 4, |
| 1157 | (u32)(high_base & 0xffffff00)); |
| 1158 | i++; |
| 1159 | _hv_pcifront_write_config(hpdev, |
| 1160 | PCI_BASE_ADDRESS_0 + (4 * i), |
| 1161 | 4, (u32)(high_base >> 32)); |
| 1162 | high_base += bar_size; |
| 1163 | } else { |
| 1164 | if (low_size != bar_size) |
| 1165 | continue; |
| 1166 | _hv_pcifront_write_config(hpdev, |
| 1167 | PCI_BASE_ADDRESS_0 + (4 * i), |
| 1168 | 4, |
| 1169 | (u32)(low_base & 0xffffff00)); |
| 1170 | low_base += bar_size; |
| 1171 | } |
| 1172 | } |
| 1173 | if (high_size <= 1 && low_size <= 1) { |
| 1174 | /* Set the memory enable bit. */ |
| 1175 | _hv_pcifront_read_config(hpdev, PCI_COMMAND, 2, |
| 1176 | &command); |
| 1177 | command |= PCI_COMMAND_MEMORY; |
| 1178 | _hv_pcifront_write_config(hpdev, PCI_COMMAND, 2, |
| 1179 | command); |
| 1180 | break; |
| 1181 | } |
| 1182 | } |
| 1183 | |
| 1184 | high_size >>= 1; |
| 1185 | low_size >>= 1; |
| 1186 | } while (high_size || low_size); |
| 1187 | |
| 1188 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1189 | } |
| 1190 | |
| 1191 | /** |
| 1192 | * create_root_hv_pci_bus() - Expose a new root PCI bus |
| 1193 | * @hbus: Root PCI bus, as understood by this driver |
| 1194 | * |
| 1195 | * Return: 0 on success, -errno on failure |
| 1196 | */ |
| 1197 | static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus) |
| 1198 | { |
| 1199 | /* Register the device */ |
| 1200 | hbus->pci_bus = pci_create_root_bus(&hbus->hdev->device, |
| 1201 | 0, /* bus number is always zero */ |
| 1202 | &hv_pcifront_ops, |
| 1203 | &hbus->sysdata, |
| 1204 | &hbus->resources_for_children); |
| 1205 | if (!hbus->pci_bus) |
| 1206 | return -ENODEV; |
| 1207 | |
| 1208 | hbus->pci_bus->msi = &hbus->msi_chip; |
| 1209 | hbus->pci_bus->msi->dev = &hbus->hdev->device; |
| 1210 | |
Long Li | 422fcc9 | 2017-03-23 14:58:32 -0700 | [diff] [blame] | 1211 | pci_lock_rescan_remove(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1212 | pci_scan_child_bus(hbus->pci_bus); |
| 1213 | pci_bus_assign_resources(hbus->pci_bus); |
| 1214 | pci_bus_add_devices(hbus->pci_bus); |
Long Li | 422fcc9 | 2017-03-23 14:58:32 -0700 | [diff] [blame] | 1215 | pci_unlock_rescan_remove(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1216 | hbus->state = hv_pcibus_installed; |
| 1217 | return 0; |
| 1218 | } |
| 1219 | |
| 1220 | struct q_res_req_compl { |
| 1221 | struct completion host_event; |
| 1222 | struct hv_pci_dev *hpdev; |
| 1223 | }; |
| 1224 | |
| 1225 | /** |
| 1226 | * q_resource_requirements() - Query Resource Requirements |
| 1227 | * @context: The completion context. |
| 1228 | * @resp: The response that came from the host. |
| 1229 | * @resp_packet_size: The size in bytes of resp. |
| 1230 | * |
| 1231 | * This function is invoked on completion of a Query Resource |
| 1232 | * Requirements packet. |
| 1233 | */ |
| 1234 | static void q_resource_requirements(void *context, struct pci_response *resp, |
| 1235 | int resp_packet_size) |
| 1236 | { |
| 1237 | struct q_res_req_compl *completion = context; |
| 1238 | struct pci_q_res_req_response *q_res_req = |
| 1239 | (struct pci_q_res_req_response *)resp; |
| 1240 | int i; |
| 1241 | |
| 1242 | if (resp->status < 0) { |
| 1243 | dev_err(&completion->hpdev->hbus->hdev->device, |
| 1244 | "query resource requirements failed: %x\n", |
| 1245 | resp->status); |
| 1246 | } else { |
| 1247 | for (i = 0; i < 6; i++) { |
| 1248 | completion->hpdev->probed_bar[i] = |
| 1249 | q_res_req->probed_bar[i]; |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | complete(&completion->host_event); |
| 1254 | } |
| 1255 | |
| 1256 | static void get_pcichild(struct hv_pci_dev *hpdev, |
| 1257 | enum hv_pcidev_ref_reason reason) |
| 1258 | { |
| 1259 | atomic_inc(&hpdev->refs); |
| 1260 | } |
| 1261 | |
| 1262 | static void put_pcichild(struct hv_pci_dev *hpdev, |
| 1263 | enum hv_pcidev_ref_reason reason) |
| 1264 | { |
| 1265 | if (atomic_dec_and_test(&hpdev->refs)) |
| 1266 | kfree(hpdev); |
| 1267 | } |
| 1268 | |
| 1269 | /** |
| 1270 | * new_pcichild_device() - Create a new child device |
| 1271 | * @hbus: The internal struct tracking this root PCI bus. |
| 1272 | * @desc: The information supplied so far from the host |
| 1273 | * about the device. |
| 1274 | * |
| 1275 | * This function creates the tracking structure for a new child |
| 1276 | * device and kicks off the process of figuring out what it is. |
| 1277 | * |
| 1278 | * Return: Pointer to the new tracking struct |
| 1279 | */ |
| 1280 | static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus, |
| 1281 | struct pci_function_description *desc) |
| 1282 | { |
| 1283 | struct hv_pci_dev *hpdev; |
| 1284 | struct pci_child_message *res_req; |
| 1285 | struct q_res_req_compl comp_pkt; |
| 1286 | union { |
| 1287 | struct pci_packet init_packet; |
| 1288 | u8 buffer[0x100]; |
| 1289 | } pkt; |
| 1290 | unsigned long flags; |
| 1291 | int ret; |
| 1292 | |
| 1293 | hpdev = kzalloc(sizeof(*hpdev), GFP_ATOMIC); |
| 1294 | if (!hpdev) |
| 1295 | return NULL; |
| 1296 | |
| 1297 | hpdev->hbus = hbus; |
| 1298 | |
| 1299 | memset(&pkt, 0, sizeof(pkt)); |
| 1300 | init_completion(&comp_pkt.host_event); |
| 1301 | comp_pkt.hpdev = hpdev; |
| 1302 | pkt.init_packet.compl_ctxt = &comp_pkt; |
| 1303 | pkt.init_packet.completion_func = q_resource_requirements; |
| 1304 | res_req = (struct pci_child_message *)&pkt.init_packet.message; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 1305 | res_req->message_type.type = PCI_QUERY_RESOURCE_REQUIREMENTS; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1306 | res_req->wslot.slot = desc->win_slot.slot; |
| 1307 | |
| 1308 | ret = vmbus_sendpacket(hbus->hdev->channel, res_req, |
| 1309 | sizeof(struct pci_child_message), |
| 1310 | (unsigned long)&pkt.init_packet, |
| 1311 | VM_PKT_DATA_INBAND, |
| 1312 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| 1313 | if (ret) |
| 1314 | goto error; |
| 1315 | |
| 1316 | wait_for_completion(&comp_pkt.host_event); |
| 1317 | |
| 1318 | hpdev->desc = *desc; |
| 1319 | get_pcichild(hpdev, hv_pcidev_ref_initial); |
| 1320 | get_pcichild(hpdev, hv_pcidev_ref_childlist); |
| 1321 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1322 | list_add_tail(&hpdev->list_entry, &hbus->children); |
| 1323 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1324 | return hpdev; |
| 1325 | |
| 1326 | error: |
| 1327 | kfree(hpdev); |
| 1328 | return NULL; |
| 1329 | } |
| 1330 | |
| 1331 | /** |
| 1332 | * get_pcichild_wslot() - Find device from slot |
| 1333 | * @hbus: Root PCI bus, as understood by this driver |
| 1334 | * @wslot: Location on the bus |
| 1335 | * |
| 1336 | * This function looks up a PCI device and returns the internal |
| 1337 | * representation of it. It acquires a reference on it, so that |
| 1338 | * the device won't be deleted while somebody is using it. The |
| 1339 | * caller is responsible for calling put_pcichild() to release |
| 1340 | * this reference. |
| 1341 | * |
| 1342 | * Return: Internal representation of a PCI device |
| 1343 | */ |
| 1344 | static struct hv_pci_dev *get_pcichild_wslot(struct hv_pcibus_device *hbus, |
| 1345 | u32 wslot) |
| 1346 | { |
| 1347 | unsigned long flags; |
| 1348 | struct hv_pci_dev *iter, *hpdev = NULL; |
| 1349 | |
| 1350 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1351 | list_for_each_entry(iter, &hbus->children, list_entry) { |
| 1352 | if (iter->desc.win_slot.slot == wslot) { |
| 1353 | hpdev = iter; |
| 1354 | get_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 1355 | break; |
| 1356 | } |
| 1357 | } |
| 1358 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1359 | |
| 1360 | return hpdev; |
| 1361 | } |
| 1362 | |
| 1363 | /** |
| 1364 | * pci_devices_present_work() - Handle new list of child devices |
| 1365 | * @work: Work struct embedded in struct hv_dr_work |
| 1366 | * |
| 1367 | * "Bus Relations" is the Windows term for "children of this |
| 1368 | * bus." The terminology is preserved here for people trying to |
| 1369 | * debug the interaction between Hyper-V and Linux. This |
| 1370 | * function is called when the parent partition reports a list |
| 1371 | * of functions that should be observed under this PCI Express |
| 1372 | * port (bus). |
| 1373 | * |
| 1374 | * This function updates the list, and must tolerate being |
| 1375 | * called multiple times with the same information. The typical |
| 1376 | * number of child devices is one, with very atypical cases |
| 1377 | * involving three or four, so the algorithms used here can be |
| 1378 | * simple and inefficient. |
| 1379 | * |
| 1380 | * It must also treat the omission of a previously observed device as |
| 1381 | * notification that the device no longer exists. |
| 1382 | * |
| 1383 | * Note that this function is a work item, and it may not be |
| 1384 | * invoked in the order that it was queued. Back to back |
| 1385 | * updates of the list of present devices may involve queuing |
| 1386 | * multiple work items, and this one may run before ones that |
| 1387 | * were sent later. As such, this function only does something |
| 1388 | * if is the last one in the queue. |
| 1389 | */ |
| 1390 | static void pci_devices_present_work(struct work_struct *work) |
| 1391 | { |
| 1392 | u32 child_no; |
| 1393 | bool found; |
| 1394 | struct list_head *iter; |
| 1395 | struct pci_function_description *new_desc; |
| 1396 | struct hv_pci_dev *hpdev; |
| 1397 | struct hv_pcibus_device *hbus; |
| 1398 | struct list_head removed; |
| 1399 | struct hv_dr_work *dr_wrk; |
| 1400 | struct hv_dr_state *dr = NULL; |
| 1401 | unsigned long flags; |
| 1402 | |
| 1403 | dr_wrk = container_of(work, struct hv_dr_work, wrk); |
| 1404 | hbus = dr_wrk->bus; |
| 1405 | kfree(dr_wrk); |
| 1406 | |
| 1407 | INIT_LIST_HEAD(&removed); |
| 1408 | |
| 1409 | if (down_interruptible(&hbus->enum_sem)) { |
| 1410 | put_hvpcibus(hbus); |
| 1411 | return; |
| 1412 | } |
| 1413 | |
| 1414 | /* Pull this off the queue and process it if it was the last one. */ |
| 1415 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1416 | while (!list_empty(&hbus->dr_list)) { |
| 1417 | dr = list_first_entry(&hbus->dr_list, struct hv_dr_state, |
| 1418 | list_entry); |
| 1419 | list_del(&dr->list_entry); |
| 1420 | |
| 1421 | /* Throw this away if the list still has stuff in it. */ |
| 1422 | if (!list_empty(&hbus->dr_list)) { |
| 1423 | kfree(dr); |
| 1424 | continue; |
| 1425 | } |
| 1426 | } |
| 1427 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1428 | |
| 1429 | if (!dr) { |
| 1430 | up(&hbus->enum_sem); |
| 1431 | put_hvpcibus(hbus); |
| 1432 | return; |
| 1433 | } |
| 1434 | |
| 1435 | /* First, mark all existing children as reported missing. */ |
| 1436 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1437 | list_for_each(iter, &hbus->children) { |
| 1438 | hpdev = container_of(iter, struct hv_pci_dev, |
| 1439 | list_entry); |
| 1440 | hpdev->reported_missing = true; |
| 1441 | } |
| 1442 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1443 | |
| 1444 | /* Next, add back any reported devices. */ |
| 1445 | for (child_no = 0; child_no < dr->device_count; child_no++) { |
| 1446 | found = false; |
| 1447 | new_desc = &dr->func[child_no]; |
| 1448 | |
| 1449 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1450 | list_for_each(iter, &hbus->children) { |
| 1451 | hpdev = container_of(iter, struct hv_pci_dev, |
| 1452 | list_entry); |
| 1453 | if ((hpdev->desc.win_slot.slot == |
| 1454 | new_desc->win_slot.slot) && |
| 1455 | (hpdev->desc.v_id == new_desc->v_id) && |
| 1456 | (hpdev->desc.d_id == new_desc->d_id) && |
| 1457 | (hpdev->desc.ser == new_desc->ser)) { |
| 1458 | hpdev->reported_missing = false; |
| 1459 | found = true; |
| 1460 | } |
| 1461 | } |
| 1462 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1463 | |
| 1464 | if (!found) { |
| 1465 | hpdev = new_pcichild_device(hbus, new_desc); |
| 1466 | if (!hpdev) |
| 1467 | dev_err(&hbus->hdev->device, |
| 1468 | "couldn't record a child device.\n"); |
| 1469 | } |
| 1470 | } |
| 1471 | |
| 1472 | /* Move missing children to a list on the stack. */ |
| 1473 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1474 | do { |
| 1475 | found = false; |
| 1476 | list_for_each(iter, &hbus->children) { |
| 1477 | hpdev = container_of(iter, struct hv_pci_dev, |
| 1478 | list_entry); |
| 1479 | if (hpdev->reported_missing) { |
| 1480 | found = true; |
| 1481 | put_pcichild(hpdev, hv_pcidev_ref_childlist); |
Wei Yongjun | 4f1cb01 | 2016-07-28 16:16:48 +0000 | [diff] [blame] | 1482 | list_move_tail(&hpdev->list_entry, &removed); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1483 | break; |
| 1484 | } |
| 1485 | } |
| 1486 | } while (found); |
| 1487 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1488 | |
| 1489 | /* Delete everything that should no longer exist. */ |
| 1490 | while (!list_empty(&removed)) { |
| 1491 | hpdev = list_first_entry(&removed, struct hv_pci_dev, |
| 1492 | list_entry); |
| 1493 | list_del(&hpdev->list_entry); |
| 1494 | put_pcichild(hpdev, hv_pcidev_ref_initial); |
| 1495 | } |
| 1496 | |
Long Li | fd15bad | 2017-03-23 14:58:10 -0700 | [diff] [blame] | 1497 | switch(hbus->state) { |
| 1498 | case hv_pcibus_installed: |
| 1499 | /* |
| 1500 | * Tell the core to rescan bus |
| 1501 | * because there may have been changes. |
| 1502 | */ |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1503 | pci_lock_rescan_remove(); |
| 1504 | pci_scan_child_bus(hbus->pci_bus); |
| 1505 | pci_unlock_rescan_remove(); |
Long Li | fd15bad | 2017-03-23 14:58:10 -0700 | [diff] [blame] | 1506 | break; |
| 1507 | |
| 1508 | case hv_pcibus_init: |
| 1509 | case hv_pcibus_probed: |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1510 | survey_child_resources(hbus); |
Long Li | fd15bad | 2017-03-23 14:58:10 -0700 | [diff] [blame] | 1511 | break; |
| 1512 | |
| 1513 | default: |
| 1514 | break; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1515 | } |
| 1516 | |
| 1517 | up(&hbus->enum_sem); |
| 1518 | put_hvpcibus(hbus); |
| 1519 | kfree(dr); |
| 1520 | } |
| 1521 | |
| 1522 | /** |
| 1523 | * hv_pci_devices_present() - Handles list of new children |
| 1524 | * @hbus: Root PCI bus, as understood by this driver |
| 1525 | * @relations: Packet from host listing children |
| 1526 | * |
| 1527 | * This function is invoked whenever a new list of devices for |
| 1528 | * this bus appears. |
| 1529 | */ |
| 1530 | static void hv_pci_devices_present(struct hv_pcibus_device *hbus, |
| 1531 | struct pci_bus_relations *relations) |
| 1532 | { |
| 1533 | struct hv_dr_state *dr; |
| 1534 | struct hv_dr_work *dr_wrk; |
| 1535 | unsigned long flags; |
| 1536 | |
| 1537 | dr_wrk = kzalloc(sizeof(*dr_wrk), GFP_NOWAIT); |
| 1538 | if (!dr_wrk) |
| 1539 | return; |
| 1540 | |
| 1541 | dr = kzalloc(offsetof(struct hv_dr_state, func) + |
| 1542 | (sizeof(struct pci_function_description) * |
| 1543 | (relations->device_count)), GFP_NOWAIT); |
| 1544 | if (!dr) { |
| 1545 | kfree(dr_wrk); |
| 1546 | return; |
| 1547 | } |
| 1548 | |
| 1549 | INIT_WORK(&dr_wrk->wrk, pci_devices_present_work); |
| 1550 | dr_wrk->bus = hbus; |
| 1551 | dr->device_count = relations->device_count; |
| 1552 | if (dr->device_count != 0) { |
| 1553 | memcpy(dr->func, relations->func, |
| 1554 | sizeof(struct pci_function_description) * |
| 1555 | dr->device_count); |
| 1556 | } |
| 1557 | |
| 1558 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
| 1559 | list_add_tail(&dr->list_entry, &hbus->dr_list); |
| 1560 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
| 1561 | |
| 1562 | get_hvpcibus(hbus); |
| 1563 | schedule_work(&dr_wrk->wrk); |
| 1564 | } |
| 1565 | |
| 1566 | /** |
| 1567 | * hv_eject_device_work() - Asynchronously handles ejection |
| 1568 | * @work: Work struct embedded in internal device struct |
| 1569 | * |
| 1570 | * This function handles ejecting a device. Windows will |
| 1571 | * attempt to gracefully eject a device, waiting 60 seconds to |
| 1572 | * hear back from the guest OS that this completed successfully. |
| 1573 | * If this timer expires, the device will be forcibly removed. |
| 1574 | */ |
| 1575 | static void hv_eject_device_work(struct work_struct *work) |
| 1576 | { |
| 1577 | struct pci_eject_response *ejct_pkt; |
Dexuan Cui | 15f093d | 2019-06-21 23:45:23 +0000 | [diff] [blame] | 1578 | struct hv_pcibus_device *hbus; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1579 | struct hv_pci_dev *hpdev; |
| 1580 | struct pci_dev *pdev; |
| 1581 | unsigned long flags; |
| 1582 | int wslot; |
| 1583 | struct { |
| 1584 | struct pci_packet pkt; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 1585 | u8 buffer[sizeof(struct pci_eject_response)]; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1586 | } ctxt; |
| 1587 | |
| 1588 | hpdev = container_of(work, struct hv_pci_dev, wrk); |
Dexuan Cui | 15f093d | 2019-06-21 23:45:23 +0000 | [diff] [blame] | 1589 | hbus = hpdev->hbus; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1590 | |
| 1591 | if (hpdev->state != hv_pcichild_ejecting) { |
| 1592 | put_pcichild(hpdev, hv_pcidev_ref_pnp); |
| 1593 | return; |
| 1594 | } |
| 1595 | |
| 1596 | /* |
| 1597 | * Ejection can come before or after the PCI bus has been set up, so |
| 1598 | * attempt to find it and tear down the bus state, if it exists. This |
| 1599 | * must be done without constructs like pci_domain_nr(hbus->pci_bus) |
| 1600 | * because hbus->pci_bus may not exist yet. |
| 1601 | */ |
| 1602 | wslot = wslot_to_devfn(hpdev->desc.win_slot.slot); |
Dexuan Cui | 15f093d | 2019-06-21 23:45:23 +0000 | [diff] [blame] | 1603 | pdev = pci_get_domain_bus_and_slot(hbus->sysdata.domain, 0, wslot); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1604 | if (pdev) { |
Long Li | 422fcc9 | 2017-03-23 14:58:32 -0700 | [diff] [blame] | 1605 | pci_lock_rescan_remove(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1606 | pci_stop_and_remove_bus_device(pdev); |
| 1607 | pci_dev_put(pdev); |
Long Li | 422fcc9 | 2017-03-23 14:58:32 -0700 | [diff] [blame] | 1608 | pci_unlock_rescan_remove(); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1609 | } |
| 1610 | |
Dexuan Cui | 15f093d | 2019-06-21 23:45:23 +0000 | [diff] [blame] | 1611 | spin_lock_irqsave(&hbus->device_list_lock, flags); |
Dexuan Cui | a8d9c5d | 2016-11-10 07:19:52 +0000 | [diff] [blame] | 1612 | list_del(&hpdev->list_entry); |
Dexuan Cui | 15f093d | 2019-06-21 23:45:23 +0000 | [diff] [blame] | 1613 | spin_unlock_irqrestore(&hbus->device_list_lock, flags); |
Dexuan Cui | a8d9c5d | 2016-11-10 07:19:52 +0000 | [diff] [blame] | 1614 | |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1615 | memset(&ctxt, 0, sizeof(ctxt)); |
| 1616 | ejct_pkt = (struct pci_eject_response *)&ctxt.pkt.message; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 1617 | ejct_pkt->message_type.type = PCI_EJECTION_COMPLETE; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1618 | ejct_pkt->wslot.slot = hpdev->desc.win_slot.slot; |
Dexuan Cui | 15f093d | 2019-06-21 23:45:23 +0000 | [diff] [blame] | 1619 | vmbus_sendpacket(hbus->hdev->channel, ejct_pkt, |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1620 | sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt, |
| 1621 | VM_PKT_DATA_INBAND, 0); |
| 1622 | |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1623 | put_pcichild(hpdev, hv_pcidev_ref_childlist); |
Dexuan Cui | 7227474 | 2019-05-15 15:42:07 -0700 | [diff] [blame] | 1624 | put_pcichild(hpdev, hv_pcidev_ref_initial); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1625 | put_pcichild(hpdev, hv_pcidev_ref_pnp); |
Dexuan Cui | 15f093d | 2019-06-21 23:45:23 +0000 | [diff] [blame] | 1626 | |
| 1627 | /* hpdev has been freed. Do not use it any more. */ |
| 1628 | put_hvpcibus(hbus); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1629 | } |
| 1630 | |
| 1631 | /** |
| 1632 | * hv_pci_eject_device() - Handles device ejection |
| 1633 | * @hpdev: Internal device tracking struct |
| 1634 | * |
| 1635 | * This function is invoked when an ejection packet arrives. It |
| 1636 | * just schedules work so that we don't re-enter the packet |
| 1637 | * delivery code handling the ejection. |
| 1638 | */ |
| 1639 | static void hv_pci_eject_device(struct hv_pci_dev *hpdev) |
| 1640 | { |
| 1641 | hpdev->state = hv_pcichild_ejecting; |
| 1642 | get_pcichild(hpdev, hv_pcidev_ref_pnp); |
| 1643 | INIT_WORK(&hpdev->wrk, hv_eject_device_work); |
| 1644 | get_hvpcibus(hpdev->hbus); |
| 1645 | schedule_work(&hpdev->wrk); |
| 1646 | } |
| 1647 | |
| 1648 | /** |
| 1649 | * hv_pci_onchannelcallback() - Handles incoming packets |
| 1650 | * @context: Internal bus tracking struct |
| 1651 | * |
| 1652 | * This function is invoked whenever the host sends a packet to |
| 1653 | * this channel (which is private to this root PCI bus). |
| 1654 | */ |
| 1655 | static void hv_pci_onchannelcallback(void *context) |
| 1656 | { |
| 1657 | const int packet_size = 0x100; |
| 1658 | int ret; |
| 1659 | struct hv_pcibus_device *hbus = context; |
| 1660 | u32 bytes_recvd; |
| 1661 | u64 req_id; |
| 1662 | struct vmpacket_descriptor *desc; |
| 1663 | unsigned char *buffer; |
| 1664 | int bufferlen = packet_size; |
| 1665 | struct pci_packet *comp_packet; |
| 1666 | struct pci_response *response; |
| 1667 | struct pci_incoming_message *new_message; |
| 1668 | struct pci_bus_relations *bus_rel; |
| 1669 | struct pci_dev_incoming *dev_message; |
| 1670 | struct hv_pci_dev *hpdev; |
| 1671 | |
| 1672 | buffer = kmalloc(bufferlen, GFP_ATOMIC); |
| 1673 | if (!buffer) |
| 1674 | return; |
| 1675 | |
| 1676 | while (1) { |
| 1677 | ret = vmbus_recvpacket_raw(hbus->hdev->channel, buffer, |
| 1678 | bufferlen, &bytes_recvd, &req_id); |
| 1679 | |
| 1680 | if (ret == -ENOBUFS) { |
| 1681 | kfree(buffer); |
| 1682 | /* Handle large packet */ |
| 1683 | bufferlen = bytes_recvd; |
| 1684 | buffer = kmalloc(bytes_recvd, GFP_ATOMIC); |
| 1685 | if (!buffer) |
| 1686 | return; |
| 1687 | continue; |
| 1688 | } |
| 1689 | |
Vitaly Kuznetsov | 837d741 | 2016-06-17 12:45:30 -0500 | [diff] [blame] | 1690 | /* Zero length indicates there are no more packets. */ |
| 1691 | if (ret || !bytes_recvd) |
| 1692 | break; |
| 1693 | |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1694 | /* |
| 1695 | * All incoming packets must be at least as large as a |
| 1696 | * response. |
| 1697 | */ |
Vitaly Kuznetsov | 60fcdac | 2016-05-30 16:17:58 +0200 | [diff] [blame] | 1698 | if (bytes_recvd <= sizeof(struct pci_response)) |
Vitaly Kuznetsov | 837d741 | 2016-06-17 12:45:30 -0500 | [diff] [blame] | 1699 | continue; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1700 | desc = (struct vmpacket_descriptor *)buffer; |
| 1701 | |
| 1702 | switch (desc->type) { |
| 1703 | case VM_PKT_COMP: |
| 1704 | |
| 1705 | /* |
| 1706 | * The host is trusted, and thus it's safe to interpret |
| 1707 | * this transaction ID as a pointer. |
| 1708 | */ |
| 1709 | comp_packet = (struct pci_packet *)req_id; |
| 1710 | response = (struct pci_response *)buffer; |
| 1711 | comp_packet->completion_func(comp_packet->compl_ctxt, |
| 1712 | response, |
| 1713 | bytes_recvd); |
Vitaly Kuznetsov | 60fcdac | 2016-05-30 16:17:58 +0200 | [diff] [blame] | 1714 | break; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1715 | |
| 1716 | case VM_PKT_DATA_INBAND: |
| 1717 | |
| 1718 | new_message = (struct pci_incoming_message *)buffer; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 1719 | switch (new_message->message_type.type) { |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1720 | case PCI_BUS_RELATIONS: |
| 1721 | |
| 1722 | bus_rel = (struct pci_bus_relations *)buffer; |
| 1723 | if (bytes_recvd < |
| 1724 | offsetof(struct pci_bus_relations, func) + |
| 1725 | (sizeof(struct pci_function_description) * |
| 1726 | (bus_rel->device_count))) { |
| 1727 | dev_err(&hbus->hdev->device, |
| 1728 | "bus relations too small\n"); |
| 1729 | break; |
| 1730 | } |
| 1731 | |
| 1732 | hv_pci_devices_present(hbus, bus_rel); |
| 1733 | break; |
| 1734 | |
| 1735 | case PCI_EJECT: |
| 1736 | |
| 1737 | dev_message = (struct pci_dev_incoming *)buffer; |
| 1738 | hpdev = get_pcichild_wslot(hbus, |
| 1739 | dev_message->wslot.slot); |
| 1740 | if (hpdev) { |
| 1741 | hv_pci_eject_device(hpdev); |
| 1742 | put_pcichild(hpdev, |
| 1743 | hv_pcidev_ref_by_slot); |
| 1744 | } |
| 1745 | break; |
| 1746 | |
| 1747 | default: |
| 1748 | dev_warn(&hbus->hdev->device, |
| 1749 | "Unimplemented protocol message %x\n", |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 1750 | new_message->message_type.type); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1751 | break; |
| 1752 | } |
| 1753 | break; |
| 1754 | |
| 1755 | default: |
| 1756 | dev_err(&hbus->hdev->device, |
| 1757 | "unhandled packet type %d, tid %llx len %d\n", |
| 1758 | desc->type, req_id, bytes_recvd); |
| 1759 | break; |
| 1760 | } |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1761 | } |
Vitaly Kuznetsov | 60fcdac | 2016-05-30 16:17:58 +0200 | [diff] [blame] | 1762 | |
| 1763 | kfree(buffer); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1764 | } |
| 1765 | |
| 1766 | /** |
| 1767 | * hv_pci_protocol_negotiation() - Set up protocol |
| 1768 | * @hdev: VMBus's tracking struct for this root PCI bus |
| 1769 | * |
| 1770 | * This driver is intended to support running on Windows 10 |
| 1771 | * (server) and later versions. It will not run on earlier |
| 1772 | * versions, as they assume that many of the operations which |
| 1773 | * Linux needs accomplished with a spinlock held were done via |
| 1774 | * asynchronous messaging via VMBus. Windows 10 increases the |
| 1775 | * surface area of PCI emulation so that these actions can take |
| 1776 | * place by suspending a virtual processor for their duration. |
| 1777 | * |
| 1778 | * This function negotiates the channel protocol version, |
| 1779 | * failing if the host doesn't support the necessary protocol |
| 1780 | * level. |
| 1781 | */ |
| 1782 | static int hv_pci_protocol_negotiation(struct hv_device *hdev) |
| 1783 | { |
| 1784 | struct pci_version_request *version_req; |
| 1785 | struct hv_pci_compl comp_pkt; |
| 1786 | struct pci_packet *pkt; |
| 1787 | int ret; |
| 1788 | |
| 1789 | /* |
| 1790 | * Initiate the handshake with the host and negotiate |
| 1791 | * a version that the host can support. We start with the |
| 1792 | * highest version number and go down if the host cannot |
| 1793 | * support it. |
| 1794 | */ |
| 1795 | pkt = kzalloc(sizeof(*pkt) + sizeof(*version_req), GFP_KERNEL); |
| 1796 | if (!pkt) |
| 1797 | return -ENOMEM; |
| 1798 | |
| 1799 | init_completion(&comp_pkt.host_event); |
| 1800 | pkt->completion_func = hv_pci_generic_compl; |
| 1801 | pkt->compl_ctxt = &comp_pkt; |
| 1802 | version_req = (struct pci_version_request *)&pkt->message; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 1803 | version_req->message_type.type = PCI_QUERY_PROTOCOL_VERSION; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1804 | version_req->protocol_version = PCI_PROTOCOL_VERSION_CURRENT; |
| 1805 | |
| 1806 | ret = vmbus_sendpacket(hdev->channel, version_req, |
| 1807 | sizeof(struct pci_version_request), |
| 1808 | (unsigned long)pkt, VM_PKT_DATA_INBAND, |
| 1809 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| 1810 | if (ret) |
| 1811 | goto exit; |
| 1812 | |
| 1813 | wait_for_completion(&comp_pkt.host_event); |
| 1814 | |
| 1815 | if (comp_pkt.completion_status < 0) { |
| 1816 | dev_err(&hdev->device, |
| 1817 | "PCI Pass-through VSP failed version request %x\n", |
| 1818 | comp_pkt.completion_status); |
| 1819 | ret = -EPROTO; |
| 1820 | goto exit; |
| 1821 | } |
| 1822 | |
| 1823 | ret = 0; |
| 1824 | |
| 1825 | exit: |
| 1826 | kfree(pkt); |
| 1827 | return ret; |
| 1828 | } |
| 1829 | |
| 1830 | /** |
| 1831 | * hv_pci_free_bridge_windows() - Release memory regions for the |
| 1832 | * bus |
| 1833 | * @hbus: Root PCI bus, as understood by this driver |
| 1834 | */ |
| 1835 | static void hv_pci_free_bridge_windows(struct hv_pcibus_device *hbus) |
| 1836 | { |
| 1837 | /* |
| 1838 | * Set the resources back to the way they looked when they |
| 1839 | * were allocated by setting IORESOURCE_BUSY again. |
| 1840 | */ |
| 1841 | |
| 1842 | if (hbus->low_mmio_space && hbus->low_mmio_res) { |
| 1843 | hbus->low_mmio_res->flags |= IORESOURCE_BUSY; |
Jake Oshins | 696ca5e | 2016-04-05 10:22:52 -0700 | [diff] [blame] | 1844 | vmbus_free_mmio(hbus->low_mmio_res->start, |
| 1845 | resource_size(hbus->low_mmio_res)); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1846 | } |
| 1847 | |
| 1848 | if (hbus->high_mmio_space && hbus->high_mmio_res) { |
| 1849 | hbus->high_mmio_res->flags |= IORESOURCE_BUSY; |
Jake Oshins | 696ca5e | 2016-04-05 10:22:52 -0700 | [diff] [blame] | 1850 | vmbus_free_mmio(hbus->high_mmio_res->start, |
| 1851 | resource_size(hbus->high_mmio_res)); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1852 | } |
| 1853 | } |
| 1854 | |
| 1855 | /** |
| 1856 | * hv_pci_allocate_bridge_windows() - Allocate memory regions |
| 1857 | * for the bus |
| 1858 | * @hbus: Root PCI bus, as understood by this driver |
| 1859 | * |
| 1860 | * This function calls vmbus_allocate_mmio(), which is itself a |
| 1861 | * bit of a compromise. Ideally, we might change the pnp layer |
| 1862 | * in the kernel such that it comprehends either PCI devices |
| 1863 | * which are "grandchildren of ACPI," with some intermediate bus |
| 1864 | * node (in this case, VMBus) or change it such that it |
| 1865 | * understands VMBus. The pnp layer, however, has been declared |
| 1866 | * deprecated, and not subject to change. |
| 1867 | * |
| 1868 | * The workaround, implemented here, is to ask VMBus to allocate |
| 1869 | * MMIO space for this bus. VMBus itself knows which ranges are |
| 1870 | * appropriate by looking at its own ACPI objects. Then, after |
| 1871 | * these ranges are claimed, they're modified to look like they |
| 1872 | * would have looked if the ACPI and pnp code had allocated |
| 1873 | * bridge windows. These descriptors have to exist in this form |
| 1874 | * in order to satisfy the code which will get invoked when the |
| 1875 | * endpoint PCI function driver calls request_mem_region() or |
| 1876 | * request_mem_region_exclusive(). |
| 1877 | * |
| 1878 | * Return: 0 on success, -errno on failure |
| 1879 | */ |
| 1880 | static int hv_pci_allocate_bridge_windows(struct hv_pcibus_device *hbus) |
| 1881 | { |
| 1882 | resource_size_t align; |
| 1883 | int ret; |
| 1884 | |
| 1885 | if (hbus->low_mmio_space) { |
| 1886 | align = 1ULL << (63 - __builtin_clzll(hbus->low_mmio_space)); |
| 1887 | ret = vmbus_allocate_mmio(&hbus->low_mmio_res, hbus->hdev, 0, |
| 1888 | (u64)(u32)0xffffffff, |
| 1889 | hbus->low_mmio_space, |
| 1890 | align, false); |
| 1891 | if (ret) { |
| 1892 | dev_err(&hbus->hdev->device, |
| 1893 | "Need %#llx of low MMIO space. Consider reconfiguring the VM.\n", |
| 1894 | hbus->low_mmio_space); |
| 1895 | return ret; |
| 1896 | } |
| 1897 | |
| 1898 | /* Modify this resource to become a bridge window. */ |
| 1899 | hbus->low_mmio_res->flags |= IORESOURCE_WINDOW; |
| 1900 | hbus->low_mmio_res->flags &= ~IORESOURCE_BUSY; |
| 1901 | pci_add_resource(&hbus->resources_for_children, |
| 1902 | hbus->low_mmio_res); |
| 1903 | } |
| 1904 | |
| 1905 | if (hbus->high_mmio_space) { |
| 1906 | align = 1ULL << (63 - __builtin_clzll(hbus->high_mmio_space)); |
| 1907 | ret = vmbus_allocate_mmio(&hbus->high_mmio_res, hbus->hdev, |
| 1908 | 0x100000000, -1, |
| 1909 | hbus->high_mmio_space, align, |
| 1910 | false); |
| 1911 | if (ret) { |
| 1912 | dev_err(&hbus->hdev->device, |
| 1913 | "Need %#llx of high MMIO space. Consider reconfiguring the VM.\n", |
| 1914 | hbus->high_mmio_space); |
| 1915 | goto release_low_mmio; |
| 1916 | } |
| 1917 | |
| 1918 | /* Modify this resource to become a bridge window. */ |
| 1919 | hbus->high_mmio_res->flags |= IORESOURCE_WINDOW; |
| 1920 | hbus->high_mmio_res->flags &= ~IORESOURCE_BUSY; |
| 1921 | pci_add_resource(&hbus->resources_for_children, |
| 1922 | hbus->high_mmio_res); |
| 1923 | } |
| 1924 | |
| 1925 | return 0; |
| 1926 | |
| 1927 | release_low_mmio: |
| 1928 | if (hbus->low_mmio_res) { |
Jake Oshins | 696ca5e | 2016-04-05 10:22:52 -0700 | [diff] [blame] | 1929 | vmbus_free_mmio(hbus->low_mmio_res->start, |
| 1930 | resource_size(hbus->low_mmio_res)); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1931 | } |
| 1932 | |
| 1933 | return ret; |
| 1934 | } |
| 1935 | |
| 1936 | /** |
| 1937 | * hv_allocate_config_window() - Find MMIO space for PCI Config |
| 1938 | * @hbus: Root PCI bus, as understood by this driver |
| 1939 | * |
| 1940 | * This function claims memory-mapped I/O space for accessing |
| 1941 | * configuration space for the functions on this bus. |
| 1942 | * |
| 1943 | * Return: 0 on success, -errno on failure |
| 1944 | */ |
| 1945 | static int hv_allocate_config_window(struct hv_pcibus_device *hbus) |
| 1946 | { |
| 1947 | int ret; |
| 1948 | |
| 1949 | /* |
| 1950 | * Set up a region of MMIO space to use for accessing configuration |
| 1951 | * space. |
| 1952 | */ |
| 1953 | ret = vmbus_allocate_mmio(&hbus->mem_config, hbus->hdev, 0, -1, |
| 1954 | PCI_CONFIG_MMIO_LENGTH, 0x1000, false); |
| 1955 | if (ret) |
| 1956 | return ret; |
| 1957 | |
| 1958 | /* |
| 1959 | * vmbus_allocate_mmio() gets used for allocating both device endpoint |
| 1960 | * resource claims (those which cannot be overlapped) and the ranges |
| 1961 | * which are valid for the children of this bus, which are intended |
| 1962 | * to be overlapped by those children. Set the flag on this claim |
| 1963 | * meaning that this region can't be overlapped. |
| 1964 | */ |
| 1965 | |
| 1966 | hbus->mem_config->flags |= IORESOURCE_BUSY; |
| 1967 | |
| 1968 | return 0; |
| 1969 | } |
| 1970 | |
| 1971 | static void hv_free_config_window(struct hv_pcibus_device *hbus) |
| 1972 | { |
Jake Oshins | 696ca5e | 2016-04-05 10:22:52 -0700 | [diff] [blame] | 1973 | vmbus_free_mmio(hbus->mem_config->start, PCI_CONFIG_MMIO_LENGTH); |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 1974 | } |
| 1975 | |
| 1976 | /** |
| 1977 | * hv_pci_enter_d0() - Bring the "bus" into the D0 power state |
| 1978 | * @hdev: VMBus's tracking struct for this root PCI bus |
| 1979 | * |
| 1980 | * Return: 0 on success, -errno on failure |
| 1981 | */ |
| 1982 | static int hv_pci_enter_d0(struct hv_device *hdev) |
| 1983 | { |
| 1984 | struct hv_pcibus_device *hbus = hv_get_drvdata(hdev); |
| 1985 | struct pci_bus_d0_entry *d0_entry; |
| 1986 | struct hv_pci_compl comp_pkt; |
| 1987 | struct pci_packet *pkt; |
| 1988 | int ret; |
| 1989 | |
| 1990 | /* |
| 1991 | * Tell the host that the bus is ready to use, and moved into the |
| 1992 | * powered-on state. This includes telling the host which region |
| 1993 | * of memory-mapped I/O space has been chosen for configuration space |
| 1994 | * access. |
| 1995 | */ |
| 1996 | pkt = kzalloc(sizeof(*pkt) + sizeof(*d0_entry), GFP_KERNEL); |
| 1997 | if (!pkt) |
| 1998 | return -ENOMEM; |
| 1999 | |
| 2000 | init_completion(&comp_pkt.host_event); |
| 2001 | pkt->completion_func = hv_pci_generic_compl; |
| 2002 | pkt->compl_ctxt = &comp_pkt; |
| 2003 | d0_entry = (struct pci_bus_d0_entry *)&pkt->message; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 2004 | d0_entry->message_type.type = PCI_BUS_D0ENTRY; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2005 | d0_entry->mmio_base = hbus->mem_config->start; |
| 2006 | |
| 2007 | ret = vmbus_sendpacket(hdev->channel, d0_entry, sizeof(*d0_entry), |
| 2008 | (unsigned long)pkt, VM_PKT_DATA_INBAND, |
| 2009 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| 2010 | if (ret) |
| 2011 | goto exit; |
| 2012 | |
| 2013 | wait_for_completion(&comp_pkt.host_event); |
| 2014 | |
| 2015 | if (comp_pkt.completion_status < 0) { |
| 2016 | dev_err(&hdev->device, |
| 2017 | "PCI Pass-through VSP failed D0 Entry with status %x\n", |
| 2018 | comp_pkt.completion_status); |
| 2019 | ret = -EPROTO; |
| 2020 | goto exit; |
| 2021 | } |
| 2022 | |
| 2023 | ret = 0; |
| 2024 | |
| 2025 | exit: |
| 2026 | kfree(pkt); |
| 2027 | return ret; |
| 2028 | } |
| 2029 | |
| 2030 | /** |
| 2031 | * hv_pci_query_relations() - Ask host to send list of child |
| 2032 | * devices |
| 2033 | * @hdev: VMBus's tracking struct for this root PCI bus |
| 2034 | * |
| 2035 | * Return: 0 on success, -errno on failure |
| 2036 | */ |
| 2037 | static int hv_pci_query_relations(struct hv_device *hdev) |
| 2038 | { |
| 2039 | struct hv_pcibus_device *hbus = hv_get_drvdata(hdev); |
| 2040 | struct pci_message message; |
| 2041 | struct completion comp; |
| 2042 | int ret; |
| 2043 | |
| 2044 | /* Ask the host to send along the list of child devices */ |
| 2045 | init_completion(&comp); |
| 2046 | if (cmpxchg(&hbus->survey_event, NULL, &comp)) |
| 2047 | return -ENOTEMPTY; |
| 2048 | |
| 2049 | memset(&message, 0, sizeof(message)); |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 2050 | message.type = PCI_QUERY_BUS_RELATIONS; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2051 | |
| 2052 | ret = vmbus_sendpacket(hdev->channel, &message, sizeof(message), |
| 2053 | 0, VM_PKT_DATA_INBAND, 0); |
| 2054 | if (ret) |
| 2055 | return ret; |
| 2056 | |
| 2057 | wait_for_completion(&comp); |
| 2058 | return 0; |
| 2059 | } |
| 2060 | |
| 2061 | /** |
| 2062 | * hv_send_resources_allocated() - Report local resource choices |
| 2063 | * @hdev: VMBus's tracking struct for this root PCI bus |
| 2064 | * |
| 2065 | * The host OS is expecting to be sent a request as a message |
| 2066 | * which contains all the resources that the device will use. |
| 2067 | * The response contains those same resources, "translated" |
| 2068 | * which is to say, the values which should be used by the |
| 2069 | * hardware, when it delivers an interrupt. (MMIO resources are |
| 2070 | * used in local terms.) This is nice for Windows, and lines up |
| 2071 | * with the FDO/PDO split, which doesn't exist in Linux. Linux |
| 2072 | * is deeply expecting to scan an emulated PCI configuration |
| 2073 | * space. So this message is sent here only to drive the state |
| 2074 | * machine on the host forward. |
| 2075 | * |
| 2076 | * Return: 0 on success, -errno on failure |
| 2077 | */ |
| 2078 | static int hv_send_resources_allocated(struct hv_device *hdev) |
| 2079 | { |
| 2080 | struct hv_pcibus_device *hbus = hv_get_drvdata(hdev); |
| 2081 | struct pci_resources_assigned *res_assigned; |
| 2082 | struct hv_pci_compl comp_pkt; |
| 2083 | struct hv_pci_dev *hpdev; |
| 2084 | struct pci_packet *pkt; |
| 2085 | u32 wslot; |
| 2086 | int ret; |
| 2087 | |
| 2088 | pkt = kmalloc(sizeof(*pkt) + sizeof(*res_assigned), GFP_KERNEL); |
| 2089 | if (!pkt) |
| 2090 | return -ENOMEM; |
| 2091 | |
| 2092 | ret = 0; |
| 2093 | |
| 2094 | for (wslot = 0; wslot < 256; wslot++) { |
| 2095 | hpdev = get_pcichild_wslot(hbus, wslot); |
| 2096 | if (!hpdev) |
| 2097 | continue; |
| 2098 | |
| 2099 | memset(pkt, 0, sizeof(*pkt) + sizeof(*res_assigned)); |
| 2100 | init_completion(&comp_pkt.host_event); |
| 2101 | pkt->completion_func = hv_pci_generic_compl; |
| 2102 | pkt->compl_ctxt = &comp_pkt; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2103 | res_assigned = (struct pci_resources_assigned *)&pkt->message; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 2104 | res_assigned->message_type.type = PCI_RESOURCES_ASSIGNED; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2105 | res_assigned->wslot.slot = hpdev->desc.win_slot.slot; |
| 2106 | |
| 2107 | put_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 2108 | |
| 2109 | ret = vmbus_sendpacket( |
| 2110 | hdev->channel, &pkt->message, |
| 2111 | sizeof(*res_assigned), |
| 2112 | (unsigned long)pkt, |
| 2113 | VM_PKT_DATA_INBAND, |
| 2114 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| 2115 | if (ret) |
| 2116 | break; |
| 2117 | |
| 2118 | wait_for_completion(&comp_pkt.host_event); |
| 2119 | |
| 2120 | if (comp_pkt.completion_status < 0) { |
| 2121 | ret = -EPROTO; |
| 2122 | dev_err(&hdev->device, |
| 2123 | "resource allocated returned 0x%x", |
| 2124 | comp_pkt.completion_status); |
| 2125 | break; |
| 2126 | } |
| 2127 | } |
| 2128 | |
| 2129 | kfree(pkt); |
| 2130 | return ret; |
| 2131 | } |
| 2132 | |
| 2133 | /** |
| 2134 | * hv_send_resources_released() - Report local resources |
| 2135 | * released |
| 2136 | * @hdev: VMBus's tracking struct for this root PCI bus |
| 2137 | * |
| 2138 | * Return: 0 on success, -errno on failure |
| 2139 | */ |
| 2140 | static int hv_send_resources_released(struct hv_device *hdev) |
| 2141 | { |
| 2142 | struct hv_pcibus_device *hbus = hv_get_drvdata(hdev); |
| 2143 | struct pci_child_message pkt; |
| 2144 | struct hv_pci_dev *hpdev; |
| 2145 | u32 wslot; |
| 2146 | int ret; |
| 2147 | |
| 2148 | for (wslot = 0; wslot < 256; wslot++) { |
| 2149 | hpdev = get_pcichild_wslot(hbus, wslot); |
| 2150 | if (!hpdev) |
| 2151 | continue; |
| 2152 | |
| 2153 | memset(&pkt, 0, sizeof(pkt)); |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 2154 | pkt.message_type.type = PCI_RESOURCES_RELEASED; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2155 | pkt.wslot.slot = hpdev->desc.win_slot.slot; |
| 2156 | |
| 2157 | put_pcichild(hpdev, hv_pcidev_ref_by_slot); |
| 2158 | |
| 2159 | ret = vmbus_sendpacket(hdev->channel, &pkt, sizeof(pkt), 0, |
| 2160 | VM_PKT_DATA_INBAND, 0); |
| 2161 | if (ret) |
| 2162 | return ret; |
| 2163 | } |
| 2164 | |
| 2165 | return 0; |
| 2166 | } |
| 2167 | |
| 2168 | static void get_hvpcibus(struct hv_pcibus_device *hbus) |
| 2169 | { |
| 2170 | atomic_inc(&hbus->remove_lock); |
| 2171 | } |
| 2172 | |
| 2173 | static void put_hvpcibus(struct hv_pcibus_device *hbus) |
| 2174 | { |
| 2175 | if (atomic_dec_and_test(&hbus->remove_lock)) |
| 2176 | complete(&hbus->remove_event); |
| 2177 | } |
| 2178 | |
| 2179 | /** |
| 2180 | * hv_pci_probe() - New VMBus channel probe, for a root PCI bus |
| 2181 | * @hdev: VMBus's tracking struct for this root PCI bus |
| 2182 | * @dev_id: Identifies the device itself |
| 2183 | * |
| 2184 | * Return: 0 on success, -errno on failure |
| 2185 | */ |
| 2186 | static int hv_pci_probe(struct hv_device *hdev, |
| 2187 | const struct hv_vmbus_device_id *dev_id) |
| 2188 | { |
| 2189 | struct hv_pcibus_device *hbus; |
| 2190 | int ret; |
| 2191 | |
| 2192 | hbus = kzalloc(sizeof(*hbus), GFP_KERNEL); |
| 2193 | if (!hbus) |
| 2194 | return -ENOMEM; |
Long Li | fd15bad | 2017-03-23 14:58:10 -0700 | [diff] [blame] | 2195 | hbus->state = hv_pcibus_init; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2196 | |
| 2197 | /* |
| 2198 | * The PCI bus "domain" is what is called "segment" in ACPI and |
| 2199 | * other specs. Pull it from the instance ID, to get something |
| 2200 | * unique. Bytes 8 and 9 are what is used in Windows guests, so |
| 2201 | * do the same thing for consistency. Note that, since this code |
| 2202 | * only runs in a Hyper-V VM, Hyper-V can (and does) guarantee |
| 2203 | * that (1) the only domain in use for something that looks like |
| 2204 | * a physical PCI bus (which is actually emulated by the |
| 2205 | * hypervisor) is domain 0 and (2) there will be no overlap |
| 2206 | * between domains derived from these instance IDs in the same |
| 2207 | * VM. |
| 2208 | */ |
| 2209 | hbus->sysdata.domain = hdev->dev_instance.b[9] | |
| 2210 | hdev->dev_instance.b[8] << 8; |
| 2211 | |
| 2212 | hbus->hdev = hdev; |
| 2213 | atomic_inc(&hbus->remove_lock); |
| 2214 | INIT_LIST_HEAD(&hbus->children); |
| 2215 | INIT_LIST_HEAD(&hbus->dr_list); |
| 2216 | INIT_LIST_HEAD(&hbus->resources_for_children); |
| 2217 | spin_lock_init(&hbus->config_lock); |
| 2218 | spin_lock_init(&hbus->device_list_lock); |
| 2219 | sema_init(&hbus->enum_sem, 1); |
| 2220 | init_completion(&hbus->remove_event); |
| 2221 | |
| 2222 | ret = vmbus_open(hdev->channel, pci_ring_size, pci_ring_size, NULL, 0, |
| 2223 | hv_pci_onchannelcallback, hbus); |
| 2224 | if (ret) |
| 2225 | goto free_bus; |
| 2226 | |
| 2227 | hv_set_drvdata(hdev, hbus); |
| 2228 | |
| 2229 | ret = hv_pci_protocol_negotiation(hdev); |
| 2230 | if (ret) |
| 2231 | goto close; |
| 2232 | |
| 2233 | ret = hv_allocate_config_window(hbus); |
| 2234 | if (ret) |
| 2235 | goto close; |
| 2236 | |
| 2237 | hbus->cfg_addr = ioremap(hbus->mem_config->start, |
| 2238 | PCI_CONFIG_MMIO_LENGTH); |
| 2239 | if (!hbus->cfg_addr) { |
| 2240 | dev_err(&hdev->device, |
| 2241 | "Unable to map a virtual address for config space\n"); |
| 2242 | ret = -ENOMEM; |
| 2243 | goto free_config; |
| 2244 | } |
| 2245 | |
| 2246 | hbus->sysdata.fwnode = irq_domain_alloc_fwnode(hbus); |
| 2247 | if (!hbus->sysdata.fwnode) { |
| 2248 | ret = -ENOMEM; |
| 2249 | goto unmap; |
| 2250 | } |
| 2251 | |
| 2252 | ret = hv_pcie_init_irq_domain(hbus); |
| 2253 | if (ret) |
| 2254 | goto free_fwnode; |
| 2255 | |
| 2256 | ret = hv_pci_query_relations(hdev); |
| 2257 | if (ret) |
| 2258 | goto free_irq_domain; |
| 2259 | |
| 2260 | ret = hv_pci_enter_d0(hdev); |
| 2261 | if (ret) |
| 2262 | goto free_irq_domain; |
| 2263 | |
| 2264 | ret = hv_pci_allocate_bridge_windows(hbus); |
| 2265 | if (ret) |
| 2266 | goto free_irq_domain; |
| 2267 | |
| 2268 | ret = hv_send_resources_allocated(hdev); |
| 2269 | if (ret) |
| 2270 | goto free_windows; |
| 2271 | |
| 2272 | prepopulate_bars(hbus); |
| 2273 | |
| 2274 | hbus->state = hv_pcibus_probed; |
| 2275 | |
| 2276 | ret = create_root_hv_pci_bus(hbus); |
| 2277 | if (ret) |
| 2278 | goto free_windows; |
| 2279 | |
| 2280 | return 0; |
| 2281 | |
| 2282 | free_windows: |
| 2283 | hv_pci_free_bridge_windows(hbus); |
| 2284 | free_irq_domain: |
| 2285 | irq_domain_remove(hbus->irq_domain); |
| 2286 | free_fwnode: |
| 2287 | irq_domain_free_fwnode(hbus->sysdata.fwnode); |
| 2288 | unmap: |
| 2289 | iounmap(hbus->cfg_addr); |
| 2290 | free_config: |
| 2291 | hv_free_config_window(hbus); |
| 2292 | close: |
| 2293 | vmbus_close(hdev->channel); |
| 2294 | free_bus: |
| 2295 | kfree(hbus); |
| 2296 | return ret; |
| 2297 | } |
| 2298 | |
| 2299 | /** |
| 2300 | * hv_pci_remove() - Remove routine for this VMBus channel |
| 2301 | * @hdev: VMBus's tracking struct for this root PCI bus |
| 2302 | * |
| 2303 | * Return: 0 on success, -errno on failure |
| 2304 | */ |
| 2305 | static int hv_pci_remove(struct hv_device *hdev) |
| 2306 | { |
| 2307 | int ret; |
| 2308 | struct hv_pcibus_device *hbus; |
| 2309 | union { |
| 2310 | struct pci_packet teardown_packet; |
| 2311 | u8 buffer[0x100]; |
| 2312 | } pkt; |
| 2313 | struct pci_bus_relations relations; |
| 2314 | struct hv_pci_compl comp_pkt; |
| 2315 | |
| 2316 | hbus = hv_get_drvdata(hdev); |
| 2317 | |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2318 | memset(&pkt.teardown_packet, 0, sizeof(pkt.teardown_packet)); |
| 2319 | init_completion(&comp_pkt.host_event); |
| 2320 | pkt.teardown_packet.completion_func = hv_pci_generic_compl; |
| 2321 | pkt.teardown_packet.compl_ctxt = &comp_pkt; |
Dexuan Cui | 0c6045d | 2016-08-23 04:45:51 +0000 | [diff] [blame] | 2322 | pkt.teardown_packet.message[0].type = PCI_BUS_D0EXIT; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2323 | |
| 2324 | ret = vmbus_sendpacket(hdev->channel, &pkt.teardown_packet.message, |
| 2325 | sizeof(struct pci_message), |
| 2326 | (unsigned long)&pkt.teardown_packet, |
| 2327 | VM_PKT_DATA_INBAND, |
| 2328 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| 2329 | if (!ret) |
| 2330 | wait_for_completion_timeout(&comp_pkt.host_event, 10 * HZ); |
| 2331 | |
| 2332 | if (hbus->state == hv_pcibus_installed) { |
| 2333 | /* Remove the bus from PCI's point of view. */ |
| 2334 | pci_lock_rescan_remove(); |
| 2335 | pci_stop_root_bus(hbus->pci_bus); |
| 2336 | pci_remove_root_bus(hbus->pci_bus); |
| 2337 | pci_unlock_rescan_remove(); |
Long Li | fd15bad | 2017-03-23 14:58:10 -0700 | [diff] [blame] | 2338 | hbus->state = hv_pcibus_removed; |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2339 | } |
| 2340 | |
Vitaly Kuznetsov | deb22e5 | 2016-04-29 11:39:10 +0200 | [diff] [blame] | 2341 | ret = hv_send_resources_released(hdev); |
| 2342 | if (ret) |
| 2343 | dev_err(&hdev->device, |
| 2344 | "Couldn't send resources released packet(s)\n"); |
| 2345 | |
Jake Oshins | 4daace0 | 2016-02-16 21:56:23 +0000 | [diff] [blame] | 2346 | vmbus_close(hdev->channel); |
| 2347 | |
| 2348 | /* Delete any children which might still exist. */ |
| 2349 | memset(&relations, 0, sizeof(relations)); |
| 2350 | hv_pci_devices_present(hbus, &relations); |
| 2351 | |
| 2352 | iounmap(hbus->cfg_addr); |
| 2353 | hv_free_config_window(hbus); |
| 2354 | pci_free_resource_list(&hbus->resources_for_children); |
| 2355 | hv_pci_free_bridge_windows(hbus); |
| 2356 | irq_domain_remove(hbus->irq_domain); |
| 2357 | irq_domain_free_fwnode(hbus->sysdata.fwnode); |
| 2358 | put_hvpcibus(hbus); |
| 2359 | wait_for_completion(&hbus->remove_event); |
| 2360 | kfree(hbus); |
| 2361 | return 0; |
| 2362 | } |
| 2363 | |
| 2364 | static const struct hv_vmbus_device_id hv_pci_id_table[] = { |
| 2365 | /* PCI Pass-through Class ID */ |
| 2366 | /* 44C4F61D-4444-4400-9D52-802E27EDE19F */ |
| 2367 | { HV_PCIE_GUID, }, |
| 2368 | { }, |
| 2369 | }; |
| 2370 | |
| 2371 | MODULE_DEVICE_TABLE(vmbus, hv_pci_id_table); |
| 2372 | |
| 2373 | static struct hv_driver hv_pci_drv = { |
| 2374 | .name = "hv_pci", |
| 2375 | .id_table = hv_pci_id_table, |
| 2376 | .probe = hv_pci_probe, |
| 2377 | .remove = hv_pci_remove, |
| 2378 | }; |
| 2379 | |
| 2380 | static void __exit exit_hv_pci_drv(void) |
| 2381 | { |
| 2382 | vmbus_driver_unregister(&hv_pci_drv); |
| 2383 | } |
| 2384 | |
| 2385 | static int __init init_hv_pci_drv(void) |
| 2386 | { |
| 2387 | return vmbus_driver_register(&hv_pci_drv); |
| 2388 | } |
| 2389 | |
| 2390 | module_init(init_hv_pci_drv); |
| 2391 | module_exit(exit_hv_pci_drv); |
| 2392 | |
| 2393 | MODULE_DESCRIPTION("Hyper-V PCI"); |
| 2394 | MODULE_LICENSE("GPL v2"); |