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1f166439 GZ |
1 | /* |
2 | * VMware VMCI Driver | |
3 | * | |
4 | * Copyright (C) 2012 VMware, Inc. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation version 2 and no later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
12 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 | * for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/vmw_vmci_defs.h> | |
17 | #include <linux/vmw_vmci_api.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/highmem.h> | |
21 | #include <linux/kernel.h> | |
ea8a83a4 | 22 | #include <linux/mm.h> |
1f166439 GZ |
23 | #include <linux/module.h> |
24 | #include <linux/sched.h> | |
ea8a83a4 | 25 | #include <linux/slab.h> |
1f166439 GZ |
26 | #include <linux/init.h> |
27 | #include <linux/pci.h> | |
28 | #include <linux/smp.h> | |
29 | #include <linux/io.h> | |
ea8a83a4 | 30 | #include <linux/vmalloc.h> |
1f166439 GZ |
31 | |
32 | #include "vmci_datagram.h" | |
33 | #include "vmci_doorbell.h" | |
34 | #include "vmci_context.h" | |
35 | #include "vmci_driver.h" | |
36 | #include "vmci_event.h" | |
37 | ||
1f166439 GZ |
38 | #define PCI_DEVICE_ID_VMWARE_VMCI 0x0740 |
39 | ||
40 | #define VMCI_UTIL_NUM_RESOURCES 1 | |
41 | ||
42 | static bool vmci_disable_msi; | |
43 | module_param_named(disable_msi, vmci_disable_msi, bool, 0); | |
44 | MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); | |
45 | ||
46 | static bool vmci_disable_msix; | |
47 | module_param_named(disable_msix, vmci_disable_msix, bool, 0); | |
48 | MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); | |
49 | ||
50 | static u32 ctx_update_sub_id = VMCI_INVALID_ID; | |
51 | static u32 vm_context_id = VMCI_INVALID_ID; | |
52 | ||
53 | struct vmci_guest_device { | |
54 | struct device *dev; /* PCI device we are attached to */ | |
55 | void __iomem *iobase; | |
56 | ||
1f166439 | 57 | bool exclusive_vectors; |
1f166439 GZ |
58 | |
59 | struct tasklet_struct datagram_tasklet; | |
60 | struct tasklet_struct bm_tasklet; | |
61 | ||
62 | void *data_buffer; | |
63 | void *notification_bitmap; | |
6d6dfb4f | 64 | dma_addr_t notification_base; |
1f166439 GZ |
65 | }; |
66 | ||
67 | /* vmci_dev singleton device and supporting data*/ | |
6d6dfb4f | 68 | struct pci_dev *vmci_pdev; |
1f166439 GZ |
69 | static struct vmci_guest_device *vmci_dev_g; |
70 | static DEFINE_SPINLOCK(vmci_dev_spinlock); | |
71 | ||
72 | static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0); | |
73 | ||
74 | bool vmci_guest_code_active(void) | |
75 | { | |
76 | return atomic_read(&vmci_num_guest_devices) != 0; | |
77 | } | |
78 | ||
79 | u32 vmci_get_vm_context_id(void) | |
80 | { | |
81 | if (vm_context_id == VMCI_INVALID_ID) { | |
1f166439 GZ |
82 | struct vmci_datagram get_cid_msg; |
83 | get_cid_msg.dst = | |
84 | vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, | |
85 | VMCI_GET_CONTEXT_ID); | |
86 | get_cid_msg.src = VMCI_ANON_SRC_HANDLE; | |
87 | get_cid_msg.payload_size = 0; | |
5a19b789 | 88 | vm_context_id = vmci_send_datagram(&get_cid_msg); |
1f166439 GZ |
89 | } |
90 | return vm_context_id; | |
91 | } | |
92 | ||
93 | /* | |
94 | * VM to hypervisor call mechanism. We use the standard VMware naming | |
95 | * convention since shared code is calling this function as well. | |
96 | */ | |
97 | int vmci_send_datagram(struct vmci_datagram *dg) | |
98 | { | |
99 | unsigned long flags; | |
100 | int result; | |
101 | ||
102 | /* Check args. */ | |
103 | if (dg == NULL) | |
104 | return VMCI_ERROR_INVALID_ARGS; | |
105 | ||
106 | /* | |
107 | * Need to acquire spinlock on the device because the datagram | |
108 | * data may be spread over multiple pages and the monitor may | |
109 | * interleave device user rpc calls from multiple | |
110 | * VCPUs. Acquiring the spinlock precludes that | |
111 | * possibility. Disabling interrupts to avoid incoming | |
112 | * datagrams during a "rep out" and possibly landing up in | |
113 | * this function. | |
114 | */ | |
115 | spin_lock_irqsave(&vmci_dev_spinlock, flags); | |
116 | ||
117 | if (vmci_dev_g) { | |
118 | iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR, | |
119 | dg, VMCI_DG_SIZE(dg)); | |
120 | result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR); | |
121 | } else { | |
122 | result = VMCI_ERROR_UNAVAILABLE; | |
123 | } | |
124 | ||
125 | spin_unlock_irqrestore(&vmci_dev_spinlock, flags); | |
126 | ||
127 | return result; | |
128 | } | |
129 | EXPORT_SYMBOL_GPL(vmci_send_datagram); | |
130 | ||
131 | /* | |
132 | * Gets called with the new context id if updated or resumed. | |
133 | * Context id. | |
134 | */ | |
135 | static void vmci_guest_cid_update(u32 sub_id, | |
136 | const struct vmci_event_data *event_data, | |
137 | void *client_data) | |
138 | { | |
139 | const struct vmci_event_payld_ctx *ev_payload = | |
140 | vmci_event_data_const_payload(event_data); | |
141 | ||
142 | if (sub_id != ctx_update_sub_id) { | |
143 | pr_devel("Invalid subscriber (ID=0x%x)\n", sub_id); | |
144 | return; | |
145 | } | |
146 | ||
147 | if (!event_data || ev_payload->context_id == VMCI_INVALID_ID) { | |
148 | pr_devel("Invalid event data\n"); | |
149 | return; | |
150 | } | |
151 | ||
152 | pr_devel("Updating context from (ID=0x%x) to (ID=0x%x) on event (type=%d)\n", | |
153 | vm_context_id, ev_payload->context_id, event_data->event); | |
154 | ||
155 | vm_context_id = ev_payload->context_id; | |
156 | } | |
157 | ||
158 | /* | |
159 | * Verify that the host supports the hypercalls we need. If it does not, | |
160 | * try to find fallback hypercalls and use those instead. Returns | |
161 | * true if required hypercalls (or fallback hypercalls) are | |
162 | * supported by the host, false otherwise. | |
163 | */ | |
782f2445 | 164 | static int vmci_check_host_caps(struct pci_dev *pdev) |
1f166439 GZ |
165 | { |
166 | bool result; | |
167 | struct vmci_resource_query_msg *msg; | |
168 | u32 msg_size = sizeof(struct vmci_resource_query_hdr) + | |
169 | VMCI_UTIL_NUM_RESOURCES * sizeof(u32); | |
170 | struct vmci_datagram *check_msg; | |
171 | ||
172 | check_msg = kmalloc(msg_size, GFP_KERNEL); | |
173 | if (!check_msg) { | |
174 | dev_err(&pdev->dev, "%s: Insufficient memory\n", __func__); | |
782f2445 | 175 | return -ENOMEM; |
1f166439 GZ |
176 | } |
177 | ||
178 | check_msg->dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, | |
179 | VMCI_RESOURCES_QUERY); | |
180 | check_msg->src = VMCI_ANON_SRC_HANDLE; | |
181 | check_msg->payload_size = msg_size - VMCI_DG_HEADERSIZE; | |
182 | msg = (struct vmci_resource_query_msg *)VMCI_DG_PAYLOAD(check_msg); | |
183 | ||
184 | msg->num_resources = VMCI_UTIL_NUM_RESOURCES; | |
185 | msg->resources[0] = VMCI_GET_CONTEXT_ID; | |
186 | ||
187 | /* Checks that hyper calls are supported */ | |
188 | result = vmci_send_datagram(check_msg) == 0x01; | |
189 | kfree(check_msg); | |
190 | ||
191 | dev_dbg(&pdev->dev, "%s: Host capability check: %s\n", | |
192 | __func__, result ? "PASSED" : "FAILED"); | |
193 | ||
194 | /* We need the vector. There are no fallbacks. */ | |
782f2445 | 195 | return result ? 0 : -ENXIO; |
1f166439 GZ |
196 | } |
197 | ||
198 | /* | |
199 | * Reads datagrams from the data in port and dispatches them. We | |
200 | * always start reading datagrams into only the first page of the | |
201 | * datagram buffer. If the datagrams don't fit into one page, we | |
202 | * use the maximum datagram buffer size for the remainder of the | |
203 | * invocation. This is a simple heuristic for not penalizing | |
204 | * small datagrams. | |
205 | * | |
206 | * This function assumes that it has exclusive access to the data | |
207 | * in port for the duration of the call. | |
208 | */ | |
209 | static void vmci_dispatch_dgs(unsigned long data) | |
210 | { | |
211 | struct vmci_guest_device *vmci_dev = (struct vmci_guest_device *)data; | |
212 | u8 *dg_in_buffer = vmci_dev->data_buffer; | |
213 | struct vmci_datagram *dg; | |
214 | size_t dg_in_buffer_size = VMCI_MAX_DG_SIZE; | |
215 | size_t current_dg_in_buffer_size = PAGE_SIZE; | |
216 | size_t remaining_bytes; | |
217 | ||
218 | BUILD_BUG_ON(VMCI_MAX_DG_SIZE < PAGE_SIZE); | |
219 | ||
220 | ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR, | |
221 | vmci_dev->data_buffer, current_dg_in_buffer_size); | |
222 | dg = (struct vmci_datagram *)dg_in_buffer; | |
223 | remaining_bytes = current_dg_in_buffer_size; | |
224 | ||
225 | while (dg->dst.resource != VMCI_INVALID_ID || | |
226 | remaining_bytes > PAGE_SIZE) { | |
227 | unsigned dg_in_size; | |
228 | ||
229 | /* | |
230 | * When the input buffer spans multiple pages, a datagram can | |
231 | * start on any page boundary in the buffer. | |
232 | */ | |
233 | if (dg->dst.resource == VMCI_INVALID_ID) { | |
234 | dg = (struct vmci_datagram *)roundup( | |
235 | (uintptr_t)dg + 1, PAGE_SIZE); | |
236 | remaining_bytes = | |
237 | (size_t)(dg_in_buffer + | |
238 | current_dg_in_buffer_size - | |
239 | (u8 *)dg); | |
240 | continue; | |
241 | } | |
242 | ||
243 | dg_in_size = VMCI_DG_SIZE_ALIGNED(dg); | |
244 | ||
245 | if (dg_in_size <= dg_in_buffer_size) { | |
246 | int result; | |
247 | ||
248 | /* | |
249 | * If the remaining bytes in the datagram | |
250 | * buffer doesn't contain the complete | |
251 | * datagram, we first make sure we have enough | |
252 | * room for it and then we read the reminder | |
253 | * of the datagram and possibly any following | |
254 | * datagrams. | |
255 | */ | |
256 | if (dg_in_size > remaining_bytes) { | |
257 | if (remaining_bytes != | |
258 | current_dg_in_buffer_size) { | |
259 | ||
260 | /* | |
261 | * We move the partial | |
262 | * datagram to the front and | |
263 | * read the reminder of the | |
264 | * datagram and possibly | |
265 | * following calls into the | |
266 | * following bytes. | |
267 | */ | |
268 | memmove(dg_in_buffer, dg_in_buffer + | |
269 | current_dg_in_buffer_size - | |
270 | remaining_bytes, | |
271 | remaining_bytes); | |
272 | dg = (struct vmci_datagram *) | |
273 | dg_in_buffer; | |
274 | } | |
275 | ||
276 | if (current_dg_in_buffer_size != | |
277 | dg_in_buffer_size) | |
278 | current_dg_in_buffer_size = | |
279 | dg_in_buffer_size; | |
280 | ||
281 | ioread8_rep(vmci_dev->iobase + | |
282 | VMCI_DATA_IN_ADDR, | |
283 | vmci_dev->data_buffer + | |
284 | remaining_bytes, | |
285 | current_dg_in_buffer_size - | |
286 | remaining_bytes); | |
287 | } | |
288 | ||
289 | /* | |
290 | * We special case event datagrams from the | |
291 | * hypervisor. | |
292 | */ | |
293 | if (dg->src.context == VMCI_HYPERVISOR_CONTEXT_ID && | |
294 | dg->dst.resource == VMCI_EVENT_HANDLER) { | |
295 | result = vmci_event_dispatch(dg); | |
296 | } else { | |
297 | result = vmci_datagram_invoke_guest_handler(dg); | |
298 | } | |
299 | if (result < VMCI_SUCCESS) | |
300 | dev_dbg(vmci_dev->dev, | |
301 | "Datagram with resource (ID=0x%x) failed (err=%d)\n", | |
302 | dg->dst.resource, result); | |
303 | ||
304 | /* On to the next datagram. */ | |
305 | dg = (struct vmci_datagram *)((u8 *)dg + | |
306 | dg_in_size); | |
307 | } else { | |
308 | size_t bytes_to_skip; | |
309 | ||
310 | /* | |
311 | * Datagram doesn't fit in datagram buffer of maximal | |
312 | * size. We drop it. | |
313 | */ | |
314 | dev_dbg(vmci_dev->dev, | |
315 | "Failed to receive datagram (size=%u bytes)\n", | |
316 | dg_in_size); | |
317 | ||
318 | bytes_to_skip = dg_in_size - remaining_bytes; | |
319 | if (current_dg_in_buffer_size != dg_in_buffer_size) | |
320 | current_dg_in_buffer_size = dg_in_buffer_size; | |
321 | ||
322 | for (;;) { | |
323 | ioread8_rep(vmci_dev->iobase + | |
324 | VMCI_DATA_IN_ADDR, | |
325 | vmci_dev->data_buffer, | |
326 | current_dg_in_buffer_size); | |
327 | if (bytes_to_skip <= current_dg_in_buffer_size) | |
328 | break; | |
329 | ||
330 | bytes_to_skip -= current_dg_in_buffer_size; | |
331 | } | |
332 | dg = (struct vmci_datagram *)(dg_in_buffer + | |
333 | bytes_to_skip); | |
334 | } | |
335 | ||
336 | remaining_bytes = | |
337 | (size_t) (dg_in_buffer + current_dg_in_buffer_size - | |
338 | (u8 *)dg); | |
339 | ||
340 | if (remaining_bytes < VMCI_DG_HEADERSIZE) { | |
341 | /* Get the next batch of datagrams. */ | |
342 | ||
343 | ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR, | |
344 | vmci_dev->data_buffer, | |
345 | current_dg_in_buffer_size); | |
346 | dg = (struct vmci_datagram *)dg_in_buffer; | |
347 | remaining_bytes = current_dg_in_buffer_size; | |
348 | } | |
349 | } | |
350 | } | |
351 | ||
352 | /* | |
353 | * Scans the notification bitmap for raised flags, clears them | |
354 | * and handles the notifications. | |
355 | */ | |
356 | static void vmci_process_bitmap(unsigned long data) | |
357 | { | |
358 | struct vmci_guest_device *dev = (struct vmci_guest_device *)data; | |
359 | ||
360 | if (!dev->notification_bitmap) { | |
361 | dev_dbg(dev->dev, "No bitmap present in %s\n", __func__); | |
362 | return; | |
363 | } | |
364 | ||
365 | vmci_dbell_scan_notification_entries(dev->notification_bitmap); | |
366 | } | |
367 | ||
1f166439 GZ |
368 | /* |
369 | * Interrupt handler for legacy or MSI interrupt, or for first MSI-X | |
370 | * interrupt (vector VMCI_INTR_DATAGRAM). | |
371 | */ | |
372 | static irqreturn_t vmci_interrupt(int irq, void *_dev) | |
373 | { | |
374 | struct vmci_guest_device *dev = _dev; | |
375 | ||
376 | /* | |
377 | * If we are using MSI-X with exclusive vectors then we simply schedule | |
378 | * the datagram tasklet, since we know the interrupt was meant for us. | |
379 | * Otherwise we must read the ICR to determine what to do. | |
380 | */ | |
381 | ||
3bb434cd | 382 | if (dev->exclusive_vectors) { |
1f166439 GZ |
383 | tasklet_schedule(&dev->datagram_tasklet); |
384 | } else { | |
385 | unsigned int icr; | |
386 | ||
387 | /* Acknowledge interrupt and determine what needs doing. */ | |
388 | icr = ioread32(dev->iobase + VMCI_ICR_ADDR); | |
389 | if (icr == 0 || icr == ~0) | |
390 | return IRQ_NONE; | |
391 | ||
392 | if (icr & VMCI_ICR_DATAGRAM) { | |
393 | tasklet_schedule(&dev->datagram_tasklet); | |
394 | icr &= ~VMCI_ICR_DATAGRAM; | |
395 | } | |
396 | ||
397 | if (icr & VMCI_ICR_NOTIFICATION) { | |
398 | tasklet_schedule(&dev->bm_tasklet); | |
399 | icr &= ~VMCI_ICR_NOTIFICATION; | |
400 | } | |
401 | ||
402 | if (icr != 0) | |
403 | dev_warn(dev->dev, | |
404 | "Ignoring unknown interrupt cause (%d)\n", | |
405 | icr); | |
406 | } | |
407 | ||
408 | return IRQ_HANDLED; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Interrupt handler for MSI-X interrupt vector VMCI_INTR_NOTIFICATION, | |
413 | * which is for the notification bitmap. Will only get called if we are | |
414 | * using MSI-X with exclusive vectors. | |
415 | */ | |
416 | static irqreturn_t vmci_interrupt_bm(int irq, void *_dev) | |
417 | { | |
418 | struct vmci_guest_device *dev = _dev; | |
419 | ||
420 | /* For MSI-X we can just assume it was meant for us. */ | |
421 | tasklet_schedule(&dev->bm_tasklet); | |
422 | ||
423 | return IRQ_HANDLED; | |
424 | } | |
425 | ||
426 | /* | |
427 | * Most of the initialization at module load time is done here. | |
428 | */ | |
429 | static int vmci_guest_probe_device(struct pci_dev *pdev, | |
430 | const struct pci_device_id *id) | |
431 | { | |
432 | struct vmci_guest_device *vmci_dev; | |
433 | void __iomem *iobase; | |
434 | unsigned int capabilities; | |
435 | unsigned long cmd; | |
436 | int vmci_err; | |
437 | int error; | |
438 | ||
439 | dev_dbg(&pdev->dev, "Probing for vmci/PCI guest device\n"); | |
440 | ||
441 | error = pcim_enable_device(pdev); | |
442 | if (error) { | |
443 | dev_err(&pdev->dev, | |
444 | "Failed to enable VMCI device: %d\n", error); | |
445 | return error; | |
446 | } | |
447 | ||
448 | error = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME); | |
449 | if (error) { | |
450 | dev_err(&pdev->dev, "Failed to reserve/map IO regions\n"); | |
451 | return error; | |
452 | } | |
453 | ||
454 | iobase = pcim_iomap_table(pdev)[0]; | |
455 | ||
456 | dev_info(&pdev->dev, "Found VMCI PCI device at %#lx, irq %u\n", | |
457 | (unsigned long)iobase, pdev->irq); | |
458 | ||
459 | vmci_dev = devm_kzalloc(&pdev->dev, sizeof(*vmci_dev), GFP_KERNEL); | |
460 | if (!vmci_dev) { | |
461 | dev_err(&pdev->dev, | |
462 | "Can't allocate memory for VMCI device\n"); | |
463 | return -ENOMEM; | |
464 | } | |
465 | ||
466 | vmci_dev->dev = &pdev->dev; | |
1f166439 GZ |
467 | vmci_dev->exclusive_vectors = false; |
468 | vmci_dev->iobase = iobase; | |
469 | ||
470 | tasklet_init(&vmci_dev->datagram_tasklet, | |
471 | vmci_dispatch_dgs, (unsigned long)vmci_dev); | |
472 | tasklet_init(&vmci_dev->bm_tasklet, | |
473 | vmci_process_bitmap, (unsigned long)vmci_dev); | |
474 | ||
475 | vmci_dev->data_buffer = vmalloc(VMCI_MAX_DG_SIZE); | |
476 | if (!vmci_dev->data_buffer) { | |
477 | dev_err(&pdev->dev, | |
478 | "Can't allocate memory for datagram buffer\n"); | |
479 | return -ENOMEM; | |
480 | } | |
481 | ||
482 | pci_set_master(pdev); /* To enable queue_pair functionality. */ | |
483 | ||
484 | /* | |
485 | * Verify that the VMCI Device supports the capabilities that | |
486 | * we need. If the device is missing capabilities that we would | |
487 | * like to use, check for fallback capabilities and use those | |
488 | * instead (so we can run a new VM on old hosts). Fail the load if | |
489 | * a required capability is missing and there is no fallback. | |
490 | * | |
491 | * Right now, we need datagrams. There are no fallbacks. | |
492 | */ | |
493 | capabilities = ioread32(vmci_dev->iobase + VMCI_CAPS_ADDR); | |
494 | if (!(capabilities & VMCI_CAPS_DATAGRAM)) { | |
495 | dev_err(&pdev->dev, "Device does not support datagrams\n"); | |
496 | error = -ENXIO; | |
497 | goto err_free_data_buffer; | |
498 | } | |
499 | ||
500 | /* | |
501 | * If the hardware supports notifications, we will use that as | |
502 | * well. | |
503 | */ | |
504 | if (capabilities & VMCI_CAPS_NOTIFICATIONS) { | |
6d6dfb4f AK |
505 | vmci_dev->notification_bitmap = dma_alloc_coherent( |
506 | &pdev->dev, PAGE_SIZE, &vmci_dev->notification_base, | |
507 | GFP_KERNEL); | |
1f166439 GZ |
508 | if (!vmci_dev->notification_bitmap) { |
509 | dev_warn(&pdev->dev, | |
510 | "Unable to allocate notification bitmap\n"); | |
511 | } else { | |
512 | memset(vmci_dev->notification_bitmap, 0, PAGE_SIZE); | |
513 | capabilities |= VMCI_CAPS_NOTIFICATIONS; | |
514 | } | |
515 | } | |
516 | ||
517 | dev_info(&pdev->dev, "Using capabilities 0x%x\n", capabilities); | |
518 | ||
519 | /* Let the host know which capabilities we intend to use. */ | |
520 | iowrite32(capabilities, vmci_dev->iobase + VMCI_CAPS_ADDR); | |
521 | ||
522 | /* Set up global device so that we can start sending datagrams */ | |
523 | spin_lock_irq(&vmci_dev_spinlock); | |
524 | vmci_dev_g = vmci_dev; | |
6d6dfb4f | 525 | vmci_pdev = pdev; |
1f166439 GZ |
526 | spin_unlock_irq(&vmci_dev_spinlock); |
527 | ||
528 | /* | |
529 | * Register notification bitmap with device if that capability is | |
530 | * used. | |
531 | */ | |
532 | if (capabilities & VMCI_CAPS_NOTIFICATIONS) { | |
6d6dfb4f AK |
533 | unsigned long bitmap_ppn = |
534 | vmci_dev->notification_base >> PAGE_SHIFT; | |
1f166439 GZ |
535 | if (!vmci_dbell_register_notification_bitmap(bitmap_ppn)) { |
536 | dev_warn(&pdev->dev, | |
537 | "VMCI device unable to register notification bitmap with PPN 0x%x\n", | |
538 | (u32) bitmap_ppn); | |
782f2445 | 539 | error = -ENXIO; |
1f166439 GZ |
540 | goto err_remove_vmci_dev_g; |
541 | } | |
542 | } | |
543 | ||
544 | /* Check host capabilities. */ | |
782f2445 DT |
545 | error = vmci_check_host_caps(pdev); |
546 | if (error) | |
1f166439 GZ |
547 | goto err_remove_bitmap; |
548 | ||
549 | /* Enable device. */ | |
550 | ||
551 | /* | |
552 | * We subscribe to the VMCI_EVENT_CTX_ID_UPDATE here so we can | |
553 | * update the internal context id when needed. | |
554 | */ | |
555 | vmci_err = vmci_event_subscribe(VMCI_EVENT_CTX_ID_UPDATE, | |
556 | vmci_guest_cid_update, NULL, | |
557 | &ctx_update_sub_id); | |
558 | if (vmci_err < VMCI_SUCCESS) | |
559 | dev_warn(&pdev->dev, | |
560 | "Failed to subscribe to event (type=%d): %d\n", | |
561 | VMCI_EVENT_CTX_ID_UPDATE, vmci_err); | |
562 | ||
563 | /* | |
564 | * Enable interrupts. Try MSI-X first, then MSI, and then fallback on | |
565 | * legacy interrupts. | |
566 | */ | |
3bb434cd CH |
567 | error = pci_alloc_irq_vectors(pdev, VMCI_MAX_INTRS, VMCI_MAX_INTRS, |
568 | PCI_IRQ_MSIX); | |
569 | if (error) { | |
570 | error = pci_alloc_irq_vectors(pdev, 1, 1, | |
571 | PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY); | |
572 | if (error) | |
573 | goto err_remove_bitmap; | |
1f166439 | 574 | } else { |
3bb434cd | 575 | vmci_dev->exclusive_vectors = true; |
1f166439 GZ |
576 | } |
577 | ||
578 | /* | |
579 | * Request IRQ for legacy or MSI interrupts, or for first | |
580 | * MSI-X vector. | |
581 | */ | |
3bb434cd CH |
582 | error = request_irq(pci_irq_vector(pdev, 0), vmci_interrupt, |
583 | IRQF_SHARED, KBUILD_MODNAME, vmci_dev); | |
1f166439 GZ |
584 | if (error) { |
585 | dev_err(&pdev->dev, "Irq %u in use: %d\n", | |
3bb434cd | 586 | pci_irq_vector(pdev, 0), error); |
1f166439 GZ |
587 | goto err_disable_msi; |
588 | } | |
589 | ||
590 | /* | |
591 | * For MSI-X with exclusive vectors we need to request an | |
592 | * interrupt for each vector so that we get a separate | |
593 | * interrupt handler routine. This allows us to distinguish | |
594 | * between the vectors. | |
595 | */ | |
596 | if (vmci_dev->exclusive_vectors) { | |
3bb434cd | 597 | error = request_irq(pci_irq_vector(pdev, 1), |
1f166439 GZ |
598 | vmci_interrupt_bm, 0, KBUILD_MODNAME, |
599 | vmci_dev); | |
600 | if (error) { | |
601 | dev_err(&pdev->dev, | |
602 | "Failed to allocate irq %u: %d\n", | |
3bb434cd | 603 | pci_irq_vector(pdev, 1), error); |
1f166439 GZ |
604 | goto err_free_irq; |
605 | } | |
606 | } | |
607 | ||
608 | dev_dbg(&pdev->dev, "Registered device\n"); | |
609 | ||
610 | atomic_inc(&vmci_num_guest_devices); | |
611 | ||
612 | /* Enable specific interrupt bits. */ | |
613 | cmd = VMCI_IMR_DATAGRAM; | |
614 | if (capabilities & VMCI_CAPS_NOTIFICATIONS) | |
615 | cmd |= VMCI_IMR_NOTIFICATION; | |
616 | iowrite32(cmd, vmci_dev->iobase + VMCI_IMR_ADDR); | |
617 | ||
618 | /* Enable interrupts. */ | |
619 | iowrite32(VMCI_CONTROL_INT_ENABLE, | |
620 | vmci_dev->iobase + VMCI_CONTROL_ADDR); | |
621 | ||
622 | pci_set_drvdata(pdev, vmci_dev); | |
623 | return 0; | |
624 | ||
625 | err_free_irq: | |
3bb434cd | 626 | free_irq(pci_irq_vector(pdev, 0), vmci_dev); |
1f166439 GZ |
627 | tasklet_kill(&vmci_dev->datagram_tasklet); |
628 | tasklet_kill(&vmci_dev->bm_tasklet); | |
629 | ||
630 | err_disable_msi: | |
3bb434cd | 631 | pci_free_irq_vectors(pdev); |
1f166439 GZ |
632 | |
633 | vmci_err = vmci_event_unsubscribe(ctx_update_sub_id); | |
634 | if (vmci_err < VMCI_SUCCESS) | |
635 | dev_warn(&pdev->dev, | |
636 | "Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n", | |
637 | VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err); | |
638 | ||
639 | err_remove_bitmap: | |
640 | if (vmci_dev->notification_bitmap) { | |
641 | iowrite32(VMCI_CONTROL_RESET, | |
642 | vmci_dev->iobase + VMCI_CONTROL_ADDR); | |
6d6dfb4f AK |
643 | dma_free_coherent(&pdev->dev, PAGE_SIZE, |
644 | vmci_dev->notification_bitmap, | |
645 | vmci_dev->notification_base); | |
1f166439 GZ |
646 | } |
647 | ||
648 | err_remove_vmci_dev_g: | |
649 | spin_lock_irq(&vmci_dev_spinlock); | |
6d6dfb4f | 650 | vmci_pdev = NULL; |
1f166439 GZ |
651 | vmci_dev_g = NULL; |
652 | spin_unlock_irq(&vmci_dev_spinlock); | |
653 | ||
654 | err_free_data_buffer: | |
655 | vfree(vmci_dev->data_buffer); | |
656 | ||
657 | /* The rest are managed resources and will be freed by PCI core */ | |
658 | return error; | |
659 | } | |
660 | ||
661 | static void vmci_guest_remove_device(struct pci_dev *pdev) | |
662 | { | |
663 | struct vmci_guest_device *vmci_dev = pci_get_drvdata(pdev); | |
664 | int vmci_err; | |
665 | ||
666 | dev_dbg(&pdev->dev, "Removing device\n"); | |
667 | ||
668 | atomic_dec(&vmci_num_guest_devices); | |
669 | ||
670 | vmci_qp_guest_endpoints_exit(); | |
671 | ||
672 | vmci_err = vmci_event_unsubscribe(ctx_update_sub_id); | |
673 | if (vmci_err < VMCI_SUCCESS) | |
674 | dev_warn(&pdev->dev, | |
675 | "Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n", | |
676 | VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err); | |
677 | ||
678 | spin_lock_irq(&vmci_dev_spinlock); | |
679 | vmci_dev_g = NULL; | |
6d6dfb4f | 680 | vmci_pdev = NULL; |
1f166439 GZ |
681 | spin_unlock_irq(&vmci_dev_spinlock); |
682 | ||
683 | dev_dbg(&pdev->dev, "Resetting vmci device\n"); | |
684 | iowrite32(VMCI_CONTROL_RESET, vmci_dev->iobase + VMCI_CONTROL_ADDR); | |
685 | ||
686 | /* | |
687 | * Free IRQ and then disable MSI/MSI-X as appropriate. For | |
688 | * MSI-X, we might have multiple vectors, each with their own | |
689 | * IRQ, which we must free too. | |
690 | */ | |
3bb434cd CH |
691 | if (vmci_dev->exclusive_vectors) |
692 | free_irq(pci_irq_vector(pdev, 1), vmci_dev); | |
693 | free_irq(pci_irq_vector(pdev, 0), vmci_dev); | |
694 | pci_free_irq_vectors(pdev); | |
1f166439 GZ |
695 | |
696 | tasklet_kill(&vmci_dev->datagram_tasklet); | |
697 | tasklet_kill(&vmci_dev->bm_tasklet); | |
698 | ||
699 | if (vmci_dev->notification_bitmap) { | |
700 | /* | |
701 | * The device reset above cleared the bitmap state of the | |
702 | * device, so we can safely free it here. | |
703 | */ | |
704 | ||
6d6dfb4f AK |
705 | dma_free_coherent(&pdev->dev, PAGE_SIZE, |
706 | vmci_dev->notification_bitmap, | |
707 | vmci_dev->notification_base); | |
1f166439 GZ |
708 | } |
709 | ||
710 | vfree(vmci_dev->data_buffer); | |
711 | ||
712 | /* The rest are managed resources and will be freed by PCI core */ | |
713 | } | |
714 | ||
32182cd3 | 715 | static const struct pci_device_id vmci_ids[] = { |
1f166439 GZ |
716 | { PCI_DEVICE(PCI_VENDOR_ID_VMWARE, PCI_DEVICE_ID_VMWARE_VMCI), }, |
717 | { 0 }, | |
718 | }; | |
719 | MODULE_DEVICE_TABLE(pci, vmci_ids); | |
720 | ||
721 | static struct pci_driver vmci_guest_driver = { | |
722 | .name = KBUILD_MODNAME, | |
723 | .id_table = vmci_ids, | |
724 | .probe = vmci_guest_probe_device, | |
725 | .remove = vmci_guest_remove_device, | |
726 | }; | |
727 | ||
728 | int __init vmci_guest_init(void) | |
729 | { | |
730 | return pci_register_driver(&vmci_guest_driver); | |
731 | } | |
732 | ||
733 | void __exit vmci_guest_exit(void) | |
734 | { | |
735 | pci_unregister_driver(&vmci_guest_driver); | |
736 | } |