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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/drivers/pci/of.c
....@@ -15,32 +15,47 @@
1515 #include <linux/of_pci.h>
1616 #include "pci.h"
1717 
18
+#ifdef CONFIG_PCI
1819 void pci_set_of_node(struct pci_dev *dev)
1920 {
2021 	if (!dev->bus->dev.of_node)
2122 		return;
2223 	dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node,
2324 						    dev->devfn);
25
+	if (dev->dev.of_node)
26
+		dev->dev.fwnode = &dev->dev.of_node->fwnode;
2427 }
2528 
2629 void pci_release_of_node(struct pci_dev *dev)
2730 {
2831 	of_node_put(dev->dev.of_node);
2932 	dev->dev.of_node = NULL;
33
+	dev->dev.fwnode = NULL;
3034 }
3135 
3236 void pci_set_bus_of_node(struct pci_bus *bus)
3337 {
34
-	if (bus->self == NULL)
35
-		bus->dev.of_node = pcibios_get_phb_of_node(bus);
36
-	else
37
-		bus->dev.of_node = of_node_get(bus->self->dev.of_node);
38
+	struct device_node *node;
39
+
40
+	if (bus->self == NULL) {
41
+		node = pcibios_get_phb_of_node(bus);
42
+	} else {
43
+		node = of_node_get(bus->self->dev.of_node);
44
+		if (node && of_property_read_bool(node, "external-facing"))
45
+			bus->self->external_facing = true;
46
+	}
47
+
48
+	bus->dev.of_node = node;
49
+
50
+	if (bus->dev.of_node)
51
+		bus->dev.fwnode = &bus->dev.of_node->fwnode;
3852 }
3953 
4054 void pci_release_bus_of_node(struct pci_bus *bus)
4155 {
4256 	of_node_put(bus->dev.of_node);
4357 	bus->dev.of_node = NULL;
58
+	bus->dev.fwnode = NULL;
4459 }
4560 
4661 struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
....@@ -113,7 +128,7 @@
113128 		 * a fake root for all functions of a multi-function
114129 		 * device we go down them as well.
115130 		 */
116
-		if (!strcmp(node->name, "multifunc-device")) {
131
+		if (of_node_name_eq(node, "multifunc-device")) {
117132 			for_each_child_of_node(node, node2) {
118133 				if (__of_pci_pci_compare(node2, devfn)) {
119134 					of_node_put(node);
....@@ -197,27 +212,6 @@
197212 EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
198213 
199214 /**
200
- * This function will try to find the limitation of link speed by finding
201
- * a property called "max-link-speed" of the given device node.
202
- *
203
- * @node: device tree node with the max link speed information
204
- *
205
- * Returns the associated max link speed from DT, or a negative value if the
206
- * required property is not found or is invalid.
207
- */
208
-int of_pci_get_max_link_speed(struct device_node *node)
209
-{
210
-	u32 max_link_speed;
211
-
212
-	if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
213
-	    max_link_speed > 4)
214
-		return -EINVAL;
215
-
216
-	return max_link_speed;
217
-}
218
-EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
219
-
220
-/**
221215  * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
222216  *                           is present and valid
223217  */
....@@ -242,7 +236,6 @@
242236 }
243237 EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
244238 
245
-#if defined(CONFIG_OF_ADDRESS)
246239 /**
247240  * devm_of_pci_get_host_bridge_resources() - Resource-managed parsing of PCI
248241  *                                           host bridge resources from DT
....@@ -250,6 +243,8 @@
250243  * @busno: bus number associated with the bridge root bus
251244  * @bus_max: maximum number of buses for this bridge
252245  * @resources: list where the range of resources will be added after DT parsing
246
+ * @ib_resources: list where the range of inbound resources (with addresses
247
+ *                from 'dma-ranges') will be added after DT parsing
253248  * @io_base: pointer to a variable that will contain on return the physical
254249  * address for the start of the I/O range. Can be NULL if the caller doesn't
255250  * expect I/O ranges to be present in the device tree.
....@@ -261,16 +256,18 @@
261256  * It returns zero if the range parsing has been successful or a standard error
262257  * value if it failed.
263258  */
264
-int devm_of_pci_get_host_bridge_resources(struct device *dev,
259
+static int devm_of_pci_get_host_bridge_resources(struct device *dev,
265260 			unsigned char busno, unsigned char bus_max,
266
-			struct list_head *resources, resource_size_t *io_base)
261
+			struct list_head *resources,
262
+			struct list_head *ib_resources,
263
+			resource_size_t *io_base)
267264 {
268265 	struct device_node *dev_node = dev->of_node;
269266 	struct resource *res, tmp_res;
270267 	struct resource *bus_range;
271268 	struct of_pci_range range;
272269 	struct of_pci_range_parser parser;
273
-	char range_type[4];
270
+	const char *range_type;
274271 	int err;
275272 
276273 	if (io_base)
....@@ -298,18 +295,18 @@
298295 	/* Check for ranges property */
299296 	err = of_pci_range_parser_init(&parser, dev_node);
300297 	if (err)
301
-		goto failed;
298
+		return 0;
302299 
303300 	dev_dbg(dev, "Parsing ranges property...\n");
304301 	for_each_of_pci_range(&parser, &range) {
305302 		/* Read next ranges element */
306303 		if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
307
-			snprintf(range_type, 4, " IO");
304
+			range_type = "IO";
308305 		else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
309
-			snprintf(range_type, 4, "MEM");
306
+			range_type = "MEM";
310307 		else
311
-			snprintf(range_type, 4, "err");
312
-		dev_info(dev, "  %s %#010llx..%#010llx -> %#010llx\n",
308
+			range_type = "err";
309
+		dev_info(dev, "  %6s %#012llx..%#012llx -> %#012llx\n",
313310 			 range_type, range.cpu_addr,
314311 			 range.cpu_addr + range.size - 1, range.pci_addr);
315312 
....@@ -346,121 +343,60 @@
346343 		pci_add_resource_offset(resources, res,	res->start - range.pci_addr);
347344 	}
348345 
346
+	/* Check for dma-ranges property */
347
+	if (!ib_resources)
348
+		return 0;
349
+	err = of_pci_dma_range_parser_init(&parser, dev_node);
350
+	if (err)
351
+		return 0;
352
+
353
+	dev_dbg(dev, "Parsing dma-ranges property...\n");
354
+	for_each_of_pci_range(&parser, &range) {
355
+		struct resource_entry *entry;
356
+		/*
357
+		 * If we failed translation or got a zero-sized region
358
+		 * then skip this range
359
+		 */
360
+		if (((range.flags & IORESOURCE_TYPE_BITS) != IORESOURCE_MEM) ||
361
+		    range.cpu_addr == OF_BAD_ADDR || range.size == 0)
362
+			continue;
363
+
364
+		dev_info(dev, "  %6s %#012llx..%#012llx -> %#012llx\n",
365
+			 "IB MEM", range.cpu_addr,
366
+			 range.cpu_addr + range.size - 1, range.pci_addr);
367
+
368
+
369
+		err = of_pci_range_to_resource(&range, dev_node, &tmp_res);
370
+		if (err)
371
+			continue;
372
+
373
+		res = devm_kmemdup(dev, &tmp_res, sizeof(tmp_res), GFP_KERNEL);
374
+		if (!res) {
375
+			err = -ENOMEM;
376
+			goto failed;
377
+		}
378
+
379
+		/* Keep the resource list sorted */
380
+		resource_list_for_each_entry(entry, ib_resources)
381
+			if (entry->res->start > res->start)
382
+				break;
383
+
384
+		pci_add_resource_offset(&entry->node, res,
385
+					res->start - range.pci_addr);
386
+	}
387
+
349388 	return 0;
350389 
351390 failed:
352391 	pci_free_resource_list(resources);
353392 	return err;
354393 }
355
-EXPORT_SYMBOL_GPL(devm_of_pci_get_host_bridge_resources);
356
-#endif /* CONFIG_OF_ADDRESS */
357
-
358
-/**
359
- * of_pci_map_rid - Translate a requester ID through a downstream mapping.
360
- * @np: root complex device node.
361
- * @rid: PCI requester ID to map.
362
- * @map_name: property name of the map to use.
363
- * @map_mask_name: optional property name of the mask to use.
364
- * @target: optional pointer to a target device node.
365
- * @id_out: optional pointer to receive the translated ID.
366
- *
367
- * Given a PCI requester ID, look up the appropriate implementation-defined
368
- * platform ID and/or the target device which receives transactions on that
369
- * ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or
370
- * @id_out may be NULL if only the other is required. If @target points to
371
- * a non-NULL device node pointer, only entries targeting that node will be
372
- * matched; if it points to a NULL value, it will receive the device node of
373
- * the first matching target phandle, with a reference held.
374
- *
375
- * Return: 0 on success or a standard error code on failure.
376
- */
377
-int of_pci_map_rid(struct device_node *np, u32 rid,
378
-		   const char *map_name, const char *map_mask_name,
379
-		   struct device_node **target, u32 *id_out)
380
-{
381
-	u32 map_mask, masked_rid;
382
-	int map_len;
383
-	const __be32 *map = NULL;
384
-
385
-	if (!np || !map_name || (!target && !id_out))
386
-		return -EINVAL;
387
-
388
-	map = of_get_property(np, map_name, &map_len);
389
-	if (!map) {
390
-		if (target)
391
-			return -ENODEV;
392
-		/* Otherwise, no map implies no translation */
393
-		*id_out = rid;
394
-		return 0;
395
-	}
396
-
397
-	if (!map_len || map_len % (4 * sizeof(*map))) {
398
-		pr_err("%pOF: Error: Bad %s length: %d\n", np,
399
-			map_name, map_len);
400
-		return -EINVAL;
401
-	}
402
-
403
-	/* The default is to select all bits. */
404
-	map_mask = 0xffffffff;
405
-
406
-	/*
407
-	 * Can be overridden by "{iommu,msi}-map-mask" property.
408
-	 * If of_property_read_u32() fails, the default is used.
409
-	 */
410
-	if (map_mask_name)
411
-		of_property_read_u32(np, map_mask_name, &map_mask);
412
-
413
-	masked_rid = map_mask & rid;
414
-	for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) {
415
-		struct device_node *phandle_node;
416
-		u32 rid_base = be32_to_cpup(map + 0);
417
-		u32 phandle = be32_to_cpup(map + 1);
418
-		u32 out_base = be32_to_cpup(map + 2);
419
-		u32 rid_len = be32_to_cpup(map + 3);
420
-
421
-		if (rid_base & ~map_mask) {
422
-			pr_err("%pOF: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n",
423
-				np, map_name, map_name,
424
-				map_mask, rid_base);
425
-			return -EFAULT;
426
-		}
427
-
428
-		if (masked_rid < rid_base || masked_rid >= rid_base + rid_len)
429
-			continue;
430
-
431
-		phandle_node = of_find_node_by_phandle(phandle);
432
-		if (!phandle_node)
433
-			return -ENODEV;
434
-
435
-		if (target) {
436
-			if (*target)
437
-				of_node_put(phandle_node);
438
-			else
439
-				*target = phandle_node;
440
-
441
-			if (*target != phandle_node)
442
-				continue;
443
-		}
444
-
445
-		if (id_out)
446
-			*id_out = masked_rid - rid_base + out_base;
447
-
448
-		pr_debug("%pOF: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n",
449
-			np, map_name, map_mask, rid_base, out_base,
450
-			rid_len, rid, masked_rid - rid_base + out_base);
451
-		return 0;
452
-	}
453
-
454
-	pr_err("%pOF: Invalid %s translation - no match for rid 0x%x on %pOF\n",
455
-		np, map_name, rid, target && *target ? *target : NULL);
456
-	return -EFAULT;
457
-}
458394 
459395 #if IS_ENABLED(CONFIG_OF_IRQ)
460396 /**
461397  * of_irq_parse_pci - Resolve the interrupt for a PCI device
462398  * @pdev:       the device whose interrupt is to be resolved
463
- * @out_irq:    structure of_irq filled by this function
399
+ * @out_irq:    structure of_phandle_args filled by this function
464400  *
465401  * This function resolves the PCI interrupt for a given PCI device. If a
466402  * device-node exists for a given pci_dev, it will use normal OF tree
....@@ -587,25 +523,26 @@
587523 EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci);
588524 #endif	/* CONFIG_OF_IRQ */
589525 
590
-int pci_parse_request_of_pci_ranges(struct device *dev,
591
-				    struct list_head *resources,
592
-				    struct resource **bus_range)
526
+static int pci_parse_request_of_pci_ranges(struct device *dev,
527
+					   struct pci_host_bridge *bridge)
593528 {
594529 	int err, res_valid = 0;
595530 	resource_size_t iobase;
596531 	struct resource_entry *win, *tmp;
597532 
598
-	INIT_LIST_HEAD(resources);
599
-	err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, resources,
600
-						    &iobase);
533
+	INIT_LIST_HEAD(&bridge->windows);
534
+	INIT_LIST_HEAD(&bridge->dma_ranges);
535
+
536
+	err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &bridge->windows,
537
+						    &bridge->dma_ranges, &iobase);
601538 	if (err)
602539 		return err;
603540 
604
-	err = devm_request_pci_bus_resources(dev, resources);
541
+	err = devm_request_pci_bus_resources(dev, &bridge->windows);
605542 	if (err)
606
-		goto out_release_res;
543
+		return err;
607544 
608
-	resource_list_for_each_entry_safe(win, tmp, resources) {
545
+	resource_list_for_each_entry_safe(win, tmp, &bridge->windows) {
609546 		struct resource *res = win->res;
610547 
611548 		switch (resource_type(res)) {
....@@ -620,21 +557,45 @@
620557 		case IORESOURCE_MEM:
621558 			res_valid |= !(res->flags & IORESOURCE_PREFETCH);
622559 			break;
623
-		case IORESOURCE_BUS:
624
-			if (bus_range)
625
-				*bus_range = res;
626
-			break;
627560 		}
628561 	}
629562 
630
-	if (res_valid)
631
-		return 0;
563
+	if (!res_valid)
564
+		dev_warn(dev, "non-prefetchable memory resource required\n");
632565 
633
-	dev_err(dev, "non-prefetchable memory resource required\n");
634
-	err = -EINVAL;
635
-
636
- out_release_res:
637
-	pci_free_resource_list(resources);
638
-	return err;
566
+	return 0;
639567 }
640568 
569
+int devm_of_pci_bridge_init(struct device *dev, struct pci_host_bridge *bridge)
570
+{
571
+	if (!dev->of_node)
572
+		return 0;
573
+
574
+	bridge->swizzle_irq = pci_common_swizzle;
575
+	bridge->map_irq = of_irq_parse_and_map_pci;
576
+
577
+	return pci_parse_request_of_pci_ranges(dev, bridge);
578
+}
579
+
580
+#endif /* CONFIG_PCI */
581
+
582
+/**
583
+ * This function will try to find the limitation of link speed by finding
584
+ * a property called "max-link-speed" of the given device node.
585
+ *
586
+ * @node: device tree node with the max link speed information
587
+ *
588
+ * Returns the associated max link speed from DT, or a negative value if the
589
+ * required property is not found or is invalid.
590
+ */
591
+int of_pci_get_max_link_speed(struct device_node *node)
592
+{
593
+	u32 max_link_speed;
594
+
595
+	if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
596
+	    max_link_speed == 0 || max_link_speed > 4)
597
+		return -EINVAL;
598
+
599
+	return max_link_speed;
600
+}
601
+EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);