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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/pci/endpoint/pci-epc-core.c
....@@ -1,5 +1,5 @@
11 // SPDX-License-Identifier: GPL-2.0
2
-/**
2
+/*
33  * PCI Endpoint *Controller* (EPC) library
44  *
55  * Copyright (C) 2017 Texas Instruments
....@@ -84,6 +84,84 @@
8484 EXPORT_SYMBOL_GPL(pci_epc_get);
8585 
8686 /**
87
+ * pci_epc_get_first_free_bar() - helper to get first unreserved BAR
88
+ * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
89
+ *
90
+ * Invoke to get the first unreserved BAR that can be used by the endpoint
91
+ * function. For any incorrect value in reserved_bar return '0'.
92
+ */
93
+enum pci_barno
94
+pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features)
95
+{
96
+	return pci_epc_get_next_free_bar(epc_features, BAR_0);
97
+}
98
+EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
99
+
100
+/**
101
+ * pci_epc_get_next_free_bar() - helper to get unreserved BAR starting from @bar
102
+ * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
103
+ * @bar: the starting BAR number from where unreserved BAR should be searched
104
+ *
105
+ * Invoke to get the next unreserved BAR starting from @bar that can be used
106
+ * for endpoint function. For any incorrect value in reserved_bar return '0'.
107
+ */
108
+enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
109
+					 *epc_features, enum pci_barno bar)
110
+{
111
+	unsigned long free_bar;
112
+
113
+	if (!epc_features)
114
+		return BAR_0;
115
+
116
+	/* If 'bar - 1' is a 64-bit BAR, move to the next BAR */
117
+	if ((epc_features->bar_fixed_64bit << 1) & 1 << bar)
118
+		bar++;
119
+
120
+	/* Find if the reserved BAR is also a 64-bit BAR */
121
+	free_bar = epc_features->reserved_bar & epc_features->bar_fixed_64bit;
122
+
123
+	/* Set the adjacent bit if the reserved BAR is also a 64-bit BAR */
124
+	free_bar <<= 1;
125
+	free_bar |= epc_features->reserved_bar;
126
+
127
+	free_bar = find_next_zero_bit(&free_bar, 6, bar);
128
+	if (free_bar > 5)
129
+		return NO_BAR;
130
+
131
+	return free_bar;
132
+}
133
+EXPORT_SYMBOL_GPL(pci_epc_get_next_free_bar);
134
+
135
+/**
136
+ * pci_epc_get_features() - get the features supported by EPC
137
+ * @epc: the features supported by *this* EPC device will be returned
138
+ * @func_no: the features supported by the EPC device specific to the
139
+ *	     endpoint function with func_no will be returned
140
+ *
141
+ * Invoke to get the features provided by the EPC which may be
142
+ * specific to an endpoint function. Returns pci_epc_features on success
143
+ * and NULL for any failures.
144
+ */
145
+const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
146
+						    u8 func_no)
147
+{
148
+	const struct pci_epc_features *epc_features;
149
+
150
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
151
+		return NULL;
152
+
153
+	if (!epc->ops->get_features)
154
+		return NULL;
155
+
156
+	mutex_lock(&epc->lock);
157
+	epc_features = epc->ops->get_features(epc, func_no);
158
+	mutex_unlock(&epc->lock);
159
+
160
+	return epc_features;
161
+}
162
+EXPORT_SYMBOL_GPL(pci_epc_get_features);
163
+
164
+/**
87165  * pci_epc_stop() - stop the PCI link
88166  * @epc: the link of the EPC device that has to be stopped
89167  *
....@@ -91,14 +169,12 @@
91169  */
92170 void pci_epc_stop(struct pci_epc *epc)
93171 {
94
-	unsigned long flags;
95
-
96172 	if (IS_ERR(epc) || !epc->ops->stop)
97173 		return;
98174 
99
-	spin_lock_irqsave(&epc->lock, flags);
175
+	mutex_lock(&epc->lock);
100176 	epc->ops->stop(epc);
101
-	spin_unlock_irqrestore(&epc->lock, flags);
177
+	mutex_unlock(&epc->lock);
102178 }
103179 EXPORT_SYMBOL_GPL(pci_epc_stop);
104180 
....@@ -111,7 +187,6 @@
111187 int pci_epc_start(struct pci_epc *epc)
112188 {
113189 	int ret;
114
-	unsigned long flags;
115190 
116191 	if (IS_ERR(epc))
117192 		return -EINVAL;
....@@ -119,9 +194,9 @@
119194 	if (!epc->ops->start)
120195 		return 0;
121196 
122
-	spin_lock_irqsave(&epc->lock, flags);
197
+	mutex_lock(&epc->lock);
123198 	ret = epc->ops->start(epc);
124
-	spin_unlock_irqrestore(&epc->lock, flags);
199
+	mutex_unlock(&epc->lock);
125200 
126201 	return ret;
127202 }
....@@ -140,7 +215,6 @@
140215 		      enum pci_epc_irq_type type, u16 interrupt_num)
141216 {
142217 	int ret;
143
-	unsigned long flags;
144218 
145219 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
146220 		return -EINVAL;
....@@ -148,9 +222,9 @@
148222 	if (!epc->ops->raise_irq)
149223 		return 0;
150224 
151
-	spin_lock_irqsave(&epc->lock, flags);
225
+	mutex_lock(&epc->lock);
152226 	ret = epc->ops->raise_irq(epc, func_no, type, interrupt_num);
153
-	spin_unlock_irqrestore(&epc->lock, flags);
227
+	mutex_unlock(&epc->lock);
154228 
155229 	return ret;
156230 }
....@@ -166,7 +240,6 @@
166240 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no)
167241 {
168242 	int interrupt;
169
-	unsigned long flags;
170243 
171244 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
172245 		return 0;
....@@ -174,9 +247,9 @@
174247 	if (!epc->ops->get_msi)
175248 		return 0;
176249 
177
-	spin_lock_irqsave(&epc->lock, flags);
250
+	mutex_lock(&epc->lock);
178251 	interrupt = epc->ops->get_msi(epc, func_no);
179
-	spin_unlock_irqrestore(&epc->lock, flags);
252
+	mutex_unlock(&epc->lock);
180253 
181254 	if (interrupt < 0)
182255 		return 0;
....@@ -199,7 +272,6 @@
199272 {
200273 	int ret;
201274 	u8 encode_int;
202
-	unsigned long flags;
203275 
204276 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
205277 	    interrupts > 32)
....@@ -210,9 +282,9 @@
210282 
211283 	encode_int = order_base_2(interrupts);
212284 
213
-	spin_lock_irqsave(&epc->lock, flags);
285
+	mutex_lock(&epc->lock);
214286 	ret = epc->ops->set_msi(epc, func_no, encode_int);
215
-	spin_unlock_irqrestore(&epc->lock, flags);
287
+	mutex_unlock(&epc->lock);
216288 
217289 	return ret;
218290 }
....@@ -228,7 +300,6 @@
228300 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no)
229301 {
230302 	int interrupt;
231
-	unsigned long flags;
232303 
233304 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
234305 		return 0;
....@@ -236,9 +307,9 @@
236307 	if (!epc->ops->get_msix)
237308 		return 0;
238309 
239
-	spin_lock_irqsave(&epc->lock, flags);
310
+	mutex_lock(&epc->lock);
240311 	interrupt = epc->ops->get_msix(epc, func_no);
241
-	spin_unlock_irqrestore(&epc->lock, flags);
312
+	mutex_unlock(&epc->lock);
242313 
243314 	if (interrupt < 0)
244315 		return 0;
....@@ -252,13 +323,15 @@
252323  * @epc: the EPC device on which MSI-X has to be configured
253324  * @func_no: the endpoint function number in the EPC device
254325  * @interrupts: number of MSI-X interrupts required by the EPF
326
+ * @bir: BAR where the MSI-X table resides
327
+ * @offset: Offset pointing to the start of MSI-X table
255328  *
256329  * Invoke to set the required number of MSI-X interrupts.
257330  */
258
-int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts)
331
+int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts,
332
+		     enum pci_barno bir, u32 offset)
259333 {
260334 	int ret;
261
-	unsigned long flags;
262335 
263336 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
264337 	    interrupts < 1 || interrupts > 2048)
....@@ -267,9 +340,9 @@
267340 	if (!epc->ops->set_msix)
268341 		return 0;
269342 
270
-	spin_lock_irqsave(&epc->lock, flags);
271
-	ret = epc->ops->set_msix(epc, func_no, interrupts - 1);
272
-	spin_unlock_irqrestore(&epc->lock, flags);
343
+	mutex_lock(&epc->lock);
344
+	ret = epc->ops->set_msix(epc, func_no, interrupts - 1, bir, offset);
345
+	mutex_unlock(&epc->lock);
273346 
274347 	return ret;
275348 }
....@@ -286,17 +359,15 @@
286359 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
287360 			phys_addr_t phys_addr)
288361 {
289
-	unsigned long flags;
290
-
291362 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
292363 		return;
293364 
294365 	if (!epc->ops->unmap_addr)
295366 		return;
296367 
297
-	spin_lock_irqsave(&epc->lock, flags);
368
+	mutex_lock(&epc->lock);
298369 	epc->ops->unmap_addr(epc, func_no, phys_addr);
299
-	spin_unlock_irqrestore(&epc->lock, flags);
370
+	mutex_unlock(&epc->lock);
300371 }
301372 EXPORT_SYMBOL_GPL(pci_epc_unmap_addr);
302373 
....@@ -314,7 +385,6 @@
314385 		     phys_addr_t phys_addr, u64 pci_addr, size_t size)
315386 {
316387 	int ret;
317
-	unsigned long flags;
318388 
319389 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
320390 		return -EINVAL;
....@@ -322,9 +392,9 @@
322392 	if (!epc->ops->map_addr)
323393 		return 0;
324394 
325
-	spin_lock_irqsave(&epc->lock, flags);
395
+	mutex_lock(&epc->lock);
326396 	ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size);
327
-	spin_unlock_irqrestore(&epc->lock, flags);
397
+	mutex_unlock(&epc->lock);
328398 
329399 	return ret;
330400 }
....@@ -341,8 +411,6 @@
341411 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
342412 		       struct pci_epf_bar *epf_bar)
343413 {
344
-	unsigned long flags;
345
-
346414 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
347415 	    (epf_bar->barno == BAR_5 &&
348416 	     epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
....@@ -351,9 +419,9 @@
351419 	if (!epc->ops->clear_bar)
352420 		return;
353421 
354
-	spin_lock_irqsave(&epc->lock, flags);
422
+	mutex_lock(&epc->lock);
355423 	epc->ops->clear_bar(epc, func_no, epf_bar);
356
-	spin_unlock_irqrestore(&epc->lock, flags);
424
+	mutex_unlock(&epc->lock);
357425 }
358426 EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
359427 
....@@ -369,7 +437,6 @@
369437 		    struct pci_epf_bar *epf_bar)
370438 {
371439 	int ret;
372
-	unsigned long irq_flags;
373440 	int flags = epf_bar->flags;
374441 
375442 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
....@@ -384,9 +451,9 @@
384451 	if (!epc->ops->set_bar)
385452 		return 0;
386453 
387
-	spin_lock_irqsave(&epc->lock, irq_flags);
454
+	mutex_lock(&epc->lock);
388455 	ret = epc->ops->set_bar(epc, func_no, epf_bar);
389
-	spin_unlock_irqrestore(&epc->lock, irq_flags);
456
+	mutex_unlock(&epc->lock);
390457 
391458 	return ret;
392459 }
....@@ -407,7 +474,6 @@
407474 			 struct pci_epf_header *header)
408475 {
409476 	int ret;
410
-	unsigned long flags;
411477 
412478 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
413479 		return -EINVAL;
....@@ -415,9 +481,9 @@
415481 	if (!epc->ops->write_header)
416482 		return 0;
417483 
418
-	spin_lock_irqsave(&epc->lock, flags);
484
+	mutex_lock(&epc->lock);
419485 	ret = epc->ops->write_header(epc, func_no, header);
420
-	spin_unlock_irqrestore(&epc->lock, flags);
486
+	mutex_unlock(&epc->lock);
421487 
422488 	return ret;
423489 }
....@@ -434,7 +500,8 @@
434500  */
435501 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf)
436502 {
437
-	unsigned long flags;
503
+	u32 func_no;
504
+	int ret = 0;
438505 
439506 	if (epf->epc)
440507 		return -EBUSY;
....@@ -442,16 +509,30 @@
442509 	if (IS_ERR(epc))
443510 		return -EINVAL;
444511 
445
-	if (epf->func_no > epc->max_functions - 1)
446
-		return -EINVAL;
512
+	mutex_lock(&epc->lock);
513
+	func_no = find_first_zero_bit(&epc->function_num_map,
514
+				      BITS_PER_LONG);
515
+	if (func_no >= BITS_PER_LONG) {
516
+		ret = -EINVAL;
517
+		goto ret;
518
+	}
447519 
520
+	if (func_no > epc->max_functions - 1) {
521
+		dev_err(&epc->dev, "Exceeding max supported Function Number\n");
522
+		ret = -EINVAL;
523
+		goto ret;
524
+	}
525
+
526
+	set_bit(func_no, &epc->function_num_map);
527
+	epf->func_no = func_no;
448528 	epf->epc = epc;
449529 
450
-	spin_lock_irqsave(&epc->lock, flags);
451530 	list_add_tail(&epf->list, &epc->pci_epf);
452
-	spin_unlock_irqrestore(&epc->lock, flags);
453531 
454
-	return 0;
532
+ret:
533
+	mutex_unlock(&epc->lock);
534
+
535
+	return ret;
455536 }
456537 EXPORT_SYMBOL_GPL(pci_epc_add_epf);
457538 
....@@ -464,14 +545,14 @@
464545  */
465546 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf)
466547 {
467
-	unsigned long flags;
468
-
469
-	if (!epc || IS_ERR(epc))
548
+	if (!epc || IS_ERR(epc) || !epf)
470549 		return;
471550 
472
-	spin_lock_irqsave(&epc->lock, flags);
551
+	mutex_lock(&epc->lock);
552
+	clear_bit(epf->func_no, &epc->function_num_map);
473553 	list_del(&epf->list);
474
-	spin_unlock_irqrestore(&epc->lock, flags);
554
+	epf->epc = NULL;
555
+	mutex_unlock(&epc->lock);
475556 }
476557 EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
477558 
....@@ -485,18 +566,29 @@
485566  */
486567 void pci_epc_linkup(struct pci_epc *epc)
487568 {
488
-	unsigned long flags;
489
-	struct pci_epf *epf;
490
-
491569 	if (!epc || IS_ERR(epc))
492570 		return;
493571 
494
-	spin_lock_irqsave(&epc->lock, flags);
495
-	list_for_each_entry(epf, &epc->pci_epf, list)
496
-		pci_epf_linkup(epf);
497
-	spin_unlock_irqrestore(&epc->lock, flags);
572
+	atomic_notifier_call_chain(&epc->notifier, LINK_UP, NULL);
498573 }
499574 EXPORT_SYMBOL_GPL(pci_epc_linkup);
575
+
576
+/**
577
+ * pci_epc_init_notify() - Notify the EPF device that EPC device's core
578
+ *			   initialization is completed.
579
+ * @epc: the EPC device whose core initialization is completeds
580
+ *
581
+ * Invoke to Notify the EPF device that the EPC device's initialization
582
+ * is completed.
583
+ */
584
+void pci_epc_init_notify(struct pci_epc *epc)
585
+{
586
+	if (!epc || IS_ERR(epc))
587
+		return;
588
+
589
+	atomic_notifier_call_chain(&epc->notifier, CORE_INIT, NULL);
590
+}
591
+EXPORT_SYMBOL_GPL(pci_epc_init_notify);
500592 
501593 /**
502594  * pci_epc_destroy() - destroy the EPC device
....@@ -556,8 +648,9 @@
556648 		goto err_ret;
557649 	}
558650 
559
-	spin_lock_init(&epc->lock);
651
+	mutex_init(&epc->lock);
560652 	INIT_LIST_HEAD(&epc->pci_epf);
653
+	ATOMIC_INIT_NOTIFIER_HEAD(&epc->notifier);
561654 
562655 	device_initialize(&epc->dev);
563656 	epc->dev.class = pci_epc_class;